sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002-2003 Luigi Rizzo
   3  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
   4  * Copyright (c) 1994 Ugen J.S.Antsilevich
   5  *
   6  * Idea and grammar partially left from:
   7  * Copyright (c) 1993 Daniel Boulet
   8  *
   9  * Redistribution and use in source forms, with and without modification,
  10  * are permitted provided that this entire comment appears intact.
  11  *
  12  * Redistribution in binary form may occur without any restrictions.
  13  * Obviously, it would be nice if you gave credit where credit is due
  14  * but requiring it would be too onerous.
  15  *
  16  * This software is provided ``AS IS'' without any warranties of any kind.
  17  *
  18  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD$
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/sockio.h>
  26 #include <sys/sysctl.h>
  27
  28 #include "ipfw2.h"
  29
  30 #include <ctype.h>
  31 #include <err.h>
  32 #include <errno.h>
  33 #include <grp.h>
  34 #include <netdb.h>
  35 #include <pwd.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <time.h>       /* ctime */
  41 #include <timeconv.h>   /* _long_to_time */
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44
  45 #include <net/ethernet.h>
  46 #include <net/if.h>             /* only IFNAMSIZ */
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>   /* only n_short, n_long */
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <netinet/ip_fw.h>
  52 #include <netinet/tcp.h>
  53 #include <arpa/inet.h>
  54
  55 struct cmdline_opts co; /* global options */
  56
  57 int resvd_set_number = RESVD_SET;
  58
  59 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  60         if (!av[0])                                                     \
  61                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  62         if (_substrcmp(*av, "tablearg") == 0) {                         \
  63                 arg = IP_FW_TABLEARG;                                   \
  64                 break;                                                  \
  65         }                                                               \
  66                                                                         \
  67         {                                                               \
  68         long _xval;                                                     \
  69         char *end;                                                      \
  70                                                                         \
  71         _xval = strtol(*av, &end, 10);                                  \
  72                                                                         \
  73         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  74                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  75                     match_value(s_x, tok), *av);                        \
  76                                                                         \
  77         if (errno == ERANGE || _xval < min || _xval > max)              \
  78                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  79                     match_value(s_x, tok), min, max, *av);              \
  80                                                                         \
  81         if (_xval == IP_FW_TABLEARG)                                    \
  82                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  83                     match_value(s_x, tok), *av);                        \
  84         arg = _xval;                                                    \
  85         }                                                               \
  86 } while (0)
  87
  88 static void
  89 PRINT_UINT_ARG(const char *str, uint32_t arg)
  90 {
  91         if (str != NULL)
  92                 printf("%s",str);
  93         if (arg == IP_FW_TABLEARG)
  94                 printf("tablearg");
  95         else
  96                 printf("%u", arg);
  97 }
  98
  99 static struct _s_x f_tcpflags[] = {
 100         { "syn", TH_SYN },
 101         { "fin", TH_FIN },
 102         { "ack", TH_ACK },
 103         { "psh", TH_PUSH },
 104         { "rst", TH_RST },
 105         { "urg", TH_URG },
 106         { "tcp flag", 0 },
 107         { NULL, 0 }
 108 };
 109
 110 static struct _s_x f_tcpopts[] = {
 111         { "mss",        IP_FW_TCPOPT_MSS },
 112         { "maxseg",     IP_FW_TCPOPT_MSS },
 113         { "window",     IP_FW_TCPOPT_WINDOW },
 114         { "sack",       IP_FW_TCPOPT_SACK },
 115         { "ts",         IP_FW_TCPOPT_TS },
 116         { "timestamp",  IP_FW_TCPOPT_TS },
 117         { "cc",         IP_FW_TCPOPT_CC },
 118         { "tcp option", 0 },
 119         { NULL, 0 }
 120 };
 121
 122 /*
 123  * IP options span the range 0 to 255 so we need to remap them
 124  * (though in fact only the low 5 bits are significant).
 125  */
 126 static struct _s_x f_ipopts[] = {
 127         { "ssrr",       IP_FW_IPOPT_SSRR},
 128         { "lsrr",       IP_FW_IPOPT_LSRR},
 129         { "rr",         IP_FW_IPOPT_RR},
 130         { "ts",         IP_FW_IPOPT_TS},
 131         { "ip option",  0 },
 132         { NULL, 0 }
 133 };
 134
 135 static struct _s_x f_iptos[] = {
 136         { "lowdelay",   IPTOS_LOWDELAY},
 137         { "throughput", IPTOS_THROUGHPUT},
 138         { "reliability", IPTOS_RELIABILITY},
 139         { "mincost",    IPTOS_MINCOST},
 140         { "congestion", IPTOS_ECN_CE},
 141         { "ecntransport", IPTOS_ECN_ECT0},
 142         { "ip tos option", 0},
 143         { NULL, 0 }
 144 };
 145
 146 static struct _s_x limit_masks[] = {
 147         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 148         {"src-addr",    DYN_SRC_ADDR},
 149         {"src-port",    DYN_SRC_PORT},
 150         {"dst-addr",    DYN_DST_ADDR},
 151         {"dst-port",    DYN_DST_PORT},
 152         {NULL,          0}
 153 };
 154
 155 /*
 156  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 157  * This is only used in this code.
 158  */
 159 #define IPPROTO_ETHERTYPE       0x1000
 160 static struct _s_x ether_types[] = {
 161     /*
 162      * Note, we cannot use "-:&/" in the names because they are field
 163      * separators in the type specifications. Also, we use s = NULL as
 164      * end-delimiter, because a type of 0 can be legal.
 165      */
 166         { "ip",         0x0800 },
 167         { "ipv4",       0x0800 },
 168         { "ipv6",       0x86dd },
 169         { "arp",        0x0806 },
 170         { "rarp",       0x8035 },
 171         { "vlan",       0x8100 },
 172         { "loop",       0x9000 },
 173         { "trail",      0x1000 },
 174         { "at",         0x809b },
 175         { "atalk",      0x809b },
 176         { "aarp",       0x80f3 },
 177         { "pppoe_disc", 0x8863 },
 178         { "pppoe_sess", 0x8864 },
 179         { "ipx_8022",   0x00E0 },
 180         { "ipx_8023",   0x0000 },
 181         { "ipx_ii",     0x8137 },
 182         { "ipx_snap",   0x8137 },
 183         { "ipx",        0x8137 },
 184         { "ns",         0x0600 },
 185         { NULL,         0 }
 186 };
 187
 188
 189 static struct _s_x rule_actions[] = {
 190         { "accept",             TOK_ACCEPT },
 191         { "pass",               TOK_ACCEPT },
 192         { "allow",              TOK_ACCEPT },
 193         { "permit",             TOK_ACCEPT },
 194         { "count",              TOK_COUNT },
 195         { "pipe",               TOK_PIPE },
 196         { "queue",              TOK_QUEUE },
 197         { "divert",             TOK_DIVERT },
 198         { "tee",                TOK_TEE },
 199         { "netgraph",           TOK_NETGRAPH },
 200         { "ngtee",              TOK_NGTEE },
 201         { "fwd",                TOK_FORWARD },
 202         { "forward",            TOK_FORWARD },
 203         { "skipto",             TOK_SKIPTO },
 204         { "deny",               TOK_DENY },
 205         { "drop",               TOK_DENY },
 206         { "reject",             TOK_REJECT },
 207         { "reset6",             TOK_RESET6 },
 208         { "reset",              TOK_RESET },
 209         { "unreach6",           TOK_UNREACH6 },
 210         { "unreach",            TOK_UNREACH },
 211         { "check-state",        TOK_CHECKSTATE },
 212         { "//",                 TOK_COMMENT },
 213         { "nat",                TOK_NAT },
 214         { "reass",              TOK_REASS },
 215         { "setfib",             TOK_SETFIB },
 216         { NULL, 0 }     /* terminator */
 217 };
 218
 219 static struct _s_x rule_action_params[] = {
 220         { "altq",               TOK_ALTQ },
 221         { "log",                TOK_LOG },
 222         { "tag",                TOK_TAG },
 223         { "untag",              TOK_UNTAG },
 224         { NULL, 0 }     /* terminator */
 225 };
 226
 227 /*
 228  * The 'lookup' instruction accepts one of the following arguments.
 229  * -1 is a terminator for the list.
 230  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 231  */
 232 static int lookup_key[] = {
 233         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 234         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 235
 236 static struct _s_x rule_options[] = {
 237         { "tagged",             TOK_TAGGED },
 238         { "uid",                TOK_UID },
 239         { "gid",                TOK_GID },
 240         { "jail",               TOK_JAIL },
 241         { "in",                 TOK_IN },
 242         { "limit",              TOK_LIMIT },
 243         { "keep-state",         TOK_KEEPSTATE },
 244         { "bridged",            TOK_LAYER2 },
 245         { "layer2",             TOK_LAYER2 },
 246         { "out",                TOK_OUT },
 247         { "diverted",           TOK_DIVERTED },
 248         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 249         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 250         { "xmit",               TOK_XMIT },
 251         { "recv",               TOK_RECV },
 252         { "via",                TOK_VIA },
 253         { "fragment",           TOK_FRAG },
 254         { "frag",               TOK_FRAG },
 255         { "fib",                TOK_FIB },
 256         { "ipoptions",          TOK_IPOPTS },
 257         { "ipopts",             TOK_IPOPTS },
 258         { "iplen",              TOK_IPLEN },
 259         { "ipid",               TOK_IPID },
 260         { "ipprecedence",       TOK_IPPRECEDENCE },
 261         { "dscp",               TOK_DSCP },
 262         { "iptos",              TOK_IPTOS },
 263         { "ipttl",              TOK_IPTTL },
 264         { "ipversion",          TOK_IPVER },
 265         { "ipver",              TOK_IPVER },
 266         { "estab",              TOK_ESTAB },
 267         { "established",        TOK_ESTAB },
 268         { "setup",              TOK_SETUP },
 269         { "sockarg",            TOK_SOCKARG },
 270         { "tcpdatalen",         TOK_TCPDATALEN },
 271         { "tcpflags",           TOK_TCPFLAGS },
 272         { "tcpflgs",            TOK_TCPFLAGS },
 273         { "tcpoptions",         TOK_TCPOPTS },
 274         { "tcpopts",            TOK_TCPOPTS },
 275         { "tcpseq",             TOK_TCPSEQ },
 276         { "tcpack",             TOK_TCPACK },
 277         { "tcpwin",             TOK_TCPWIN },
 278         { "icmptype",           TOK_ICMPTYPES },
 279         { "icmptypes",          TOK_ICMPTYPES },
 280         { "dst-ip",             TOK_DSTIP },
 281         { "src-ip",             TOK_SRCIP },
 282         { "dst-port",           TOK_DSTPORT },
 283         { "src-port",           TOK_SRCPORT },
 284         { "proto",              TOK_PROTO },
 285         { "MAC",                TOK_MAC },
 286         { "mac",                TOK_MAC },
 287         { "mac-type",           TOK_MACTYPE },
 288         { "verrevpath",         TOK_VERREVPATH },
 289         { "versrcreach",        TOK_VERSRCREACH },
 290         { "antispoof",          TOK_ANTISPOOF },
 291         { "ipsec",              TOK_IPSEC },
 292         { "icmp6type",          TOK_ICMP6TYPES },
 293         { "icmp6types",         TOK_ICMP6TYPES },
 294         { "ext6hdr",            TOK_EXT6HDR},
 295         { "flow-id",            TOK_FLOWID},
 296         { "ipv6",               TOK_IPV6},
 297         { "ip6",                TOK_IPV6},
 298         { "ipv4",               TOK_IPV4},
 299         { "ip4",                TOK_IPV4},
 300         { "dst-ipv6",           TOK_DSTIP6},
 301         { "dst-ip6",            TOK_DSTIP6},
 302         { "src-ipv6",           TOK_SRCIP6},
 303         { "src-ip6",            TOK_SRCIP6},
 304         { "lookup",             TOK_LOOKUP},
 305         { "//",                 TOK_COMMENT },
 306
 307         { "not",                TOK_NOT },              /* pseudo option */
 308         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 309         { "or",                 TOK_OR },               /* pseudo option */
 310         { "|", /* escape */     TOK_OR },               /* pseudo option */
 311         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 312         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 313         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 314         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 315         { NULL, 0 }     /* terminator */
 316 };
 317
 318 /*
 319  * Helper routine to print a possibly unaligned uint64_t on
 320  * various platform. If width > 0, print the value with
 321  * the desired width, followed by a space;
 322  * otherwise, return the required width.
 323  */
 324 int
 325 pr_u64(uint64_t *pd, int width)
 326 {
 327 #ifdef TCC
 328 #define U64_FMT "I64"
 329 #else
 330 #define U64_FMT "llu"
 331 #endif
 332         uint64_t u;
 333         unsigned long long d;
 334
 335         bcopy (pd, &u, sizeof(u));
 336         d = u;
 337         return (width > 0) ?
 338                 printf("%*" U64_FMT " ", width, d) :
 339                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 340 #undef U64_FMT
 341 }
 342
 343 void *
 344 safe_calloc(size_t number, size_t size)
 345 {
 346         void *ret = calloc(number, size);
 347
 348         if (ret == NULL)
 349                 err(EX_OSERR, "calloc");
 350         return ret;
 351 }
 352
 353 void *
 354 safe_realloc(void *ptr, size_t size)
 355 {
 356         void *ret = realloc(ptr, size);
 357
 358         if (ret == NULL)
 359                 err(EX_OSERR, "realloc");
 360         return ret;
 361 }
 362
 363 /*
 364  * conditionally runs the command.
 365  * Selected options or negative -> getsockopt
 366  */
 367 int
 368 do_cmd(int optname, void *optval, uintptr_t optlen)
 369 {
 370         static int s = -1;      /* the socket */
 371         int i;
 372
 373         if (co.test_only)
 374                 return 0;
 375
 376         if (s == -1)
 377                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 378         if (s < 0)
 379                 err(EX_UNAVAILABLE, "socket");
 380
 381         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 382             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 383             optname == IP_FW_TABLE_GETSIZE ||
 384             optname == IP_FW_NAT_GET_CONFIG ||
 385             optname < 0 ||
 386             optname == IP_FW_NAT_GET_LOG) {
 387                 if (optname < 0)
 388                         optname = -optname;
 389                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 390                         (socklen_t *)optlen);
 391         } else {
 392                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 393         }
 394         return i;
 395 }
 396
 397 /**
 398  * match_token takes a table and a string, returns the value associated
 399  * with the string (-1 in case of failure).
 400  */
 401 int
 402 match_token(struct _s_x *table, char *string)
 403 {
 404         struct _s_x *pt;
 405         uint i = strlen(string);
 406
 407         for (pt = table ; i && pt->s != NULL ; pt++)
 408                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 409                         return pt->x;
 410         return -1;
 411 }
 412
 413 /**
 414  * match_value takes a table and a value, returns the string associated
 415  * with the value (NULL in case of failure).
 416  */
 417 char const *
 418 match_value(struct _s_x *p, int value)
 419 {
 420         for (; p->s != NULL; p++)
 421                 if (p->x == value)
 422                         return p->s;
 423         return NULL;
 424 }
 425
 426 /*
 427  * _substrcmp takes two strings and returns 1 if they do not match,
 428  * and 0 if they match exactly or the first string is a sub-string
 429  * of the second.  A warning is printed to stderr in the case that the
 430  * first string is a sub-string of the second.
 431  *
 432  * This function will be removed in the future through the usual
 433  * deprecation process.
 434  */
 435 int
 436 _substrcmp(const char *str1, const char* str2)
 437 {
 438
 439         if (strncmp(str1, str2, strlen(str1)) != 0)
 440                 return 1;
 441
 442         if (strlen(str1) != strlen(str2))
 443                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 444                     str1, str2);
 445         return 0;
 446 }
 447
 448 /*
 449  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 450  * and 0 if they match exactly or the second string is a sub-string
 451  * of the first.  A warning is printed to stderr in the case that the
 452  * first string does not match the third.
 453  *
 454  * This function exists to warn about the bizzare construction
 455  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 456  * for "bytes".  The problem is that in addition to accepting "by",
 457  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 458  * other string beginning with "by".
 459  *
 460  * This function will be removed in the future through the usual
 461  * deprecation process.
 462  */
 463 int
 464 _substrcmp2(const char *str1, const char* str2, const char* str3)
 465 {
 466
 467         if (strncmp(str1, str2, strlen(str2)) != 0)
 468                 return 1;
 469
 470         if (strcmp(str1, str3) != 0)
 471                 warnx("DEPRECATED: '%s' matched '%s'",
 472                     str1, str3);
 473         return 0;
 474 }
 475
 476 /*
 477  * prints one port, symbolic or numeric
 478  */
 479 static void
 480 print_port(int proto, uint16_t port)
 481 {
 482
 483         if (proto == IPPROTO_ETHERTYPE) {
 484                 char const *s;
 485
 486                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 487                         printf("%s", s);
 488                 else
 489                         printf("0x%04x", port);
 490         } else {
 491                 struct servent *se = NULL;
 492                 if (co.do_resolv) {
 493                         struct protoent *pe = getprotobynumber(proto);
 494
 495                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 496                 }
 497                 if (se)
 498                         printf("%s", se->s_name);
 499                 else
 500                         printf("%d", port);
 501         }
 502 }
 503
 504 static struct _s_x _port_name[] = {
 505         {"dst-port",    O_IP_DSTPORT},
 506         {"src-port",    O_IP_SRCPORT},
 507         {"ipid",        O_IPID},
 508         {"iplen",       O_IPLEN},
 509         {"ipttl",       O_IPTTL},
 510         {"mac-type",    O_MAC_TYPE},
 511         {"tcpdatalen",  O_TCPDATALEN},
 512         {"tagged",      O_TAGGED},
 513         {NULL,          0}
 514 };
 515
 516 /*
 517  * Print the values in a list 16-bit items of the types above.
 518  * XXX todo: add support for mask.
 519  */
 520 static void
 521 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 522 {
 523         uint16_t *p = cmd->ports;
 524         int i;
 525         char const *sep;
 526
 527         if (opcode != 0) {
 528                 sep = match_value(_port_name, opcode);
 529                 if (sep == NULL)
 530                         sep = "???";
 531                 printf (" %s", sep);
 532         }
 533         sep = " ";
 534         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 535                 printf("%s", sep);
 536                 print_port(proto, p[0]);
 537                 if (p[0] != p[1]) {
 538                         printf("-");
 539                         print_port(proto, p[1]);
 540                 }
 541                 sep = ",";
 542         }
 543 }
 544
 545 /*
 546  * Like strtol, but also translates service names into port numbers
 547  * for some protocols.
 548  * In particular:
 549  *      proto == -1 disables the protocol check;
 550  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 551  *      proto == <some value in /etc/protocols> matches the values there.
 552  * Returns *end == s in case the parameter is not found.
 553  */
 554 static int
 555 strtoport(char *s, char **end, int base, int proto)
 556 {
 557         char *p, *buf;
 558         char *s1;
 559         int i;
 560
 561         *end = s;               /* default - not found */
 562         if (*s == '\0')
 563                 return 0;       /* not found */
 564
 565         if (isdigit(*s))
 566                 return strtol(s, end, base);
 567
 568         /*
 569          * find separator. '\\' escapes the next char.
 570          */
 571         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 572                 if (*s1 == '\\' && s1[1] != '\0')
 573                         s1++;
 574
 575         buf = safe_calloc(s1 - s + 1, 1);
 576
 577         /*
 578          * copy into a buffer skipping backslashes
 579          */
 580         for (p = s, i = 0; p != s1 ; p++)
 581                 if (*p != '\\')
 582                         buf[i++] = *p;
 583         buf[i++] = '\0';
 584
 585         if (proto == IPPROTO_ETHERTYPE) {
 586                 i = match_token(ether_types, buf);
 587                 free(buf);
 588                 if (i != -1) {  /* found */
 589                         *end = s1;
 590                         return i;
 591                 }
 592         } else {
 593                 struct protoent *pe = NULL;
 594                 struct servent *se;
 595
 596                 if (proto != 0)
 597                         pe = getprotobynumber(proto);
 598                 setservent(1);
 599                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 600                 free(buf);
 601                 if (se != NULL) {
 602                         *end = s1;
 603                         return ntohs(se->s_port);
 604                 }
 605         }
 606         return 0;       /* not found */
 607 }
 608
 609 /*
 610  * Fill the body of the command with the list of port ranges.
 611  */
 612 static int
 613 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 614 {
 615         uint16_t a, b, *p = cmd->ports;
 616         int i = 0;
 617         char *s = av;
 618
 619         while (*s) {
 620                 a = strtoport(av, &s, 0, proto);
 621                 if (s == av)                    /* empty or invalid argument */
 622                         return (0);
 623
 624                 switch (*s) {
 625                 case '-':                       /* a range */
 626                         av = s + 1;
 627                         b = strtoport(av, &s, 0, proto);
 628                         /* Reject expressions like '1-abc' or '1-2-3'. */
 629                         if (s == av || (*s != ',' && *s != '\0'))
 630                                 return (0);
 631                         p[0] = a;
 632                         p[1] = b;
 633                         break;
 634                 case ',':                       /* comma separated list */
 635                 case '\0':
 636                         p[0] = p[1] = a;
 637                         break;
 638                 default:
 639                         warnx("port list: invalid separator <%c> in <%s>",
 640                                 *s, av);
 641                         return (0);
 642                 }
 643
 644                 i++;
 645                 p += 2;
 646                 av = s + 1;
 647         }
 648         if (i > 0) {
 649                 if (i + 1 > F_LEN_MASK)
 650                         errx(EX_DATAERR, "too many ports/ranges\n");
 651                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 652         }
 653         return (i);
 654 }
 655
 656 static struct _s_x icmpcodes[] = {
 657       { "net",                  ICMP_UNREACH_NET },
 658       { "host",                 ICMP_UNREACH_HOST },
 659       { "protocol",             ICMP_UNREACH_PROTOCOL },
 660       { "port",                 ICMP_UNREACH_PORT },
 661       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 662       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 663       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 664       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 665       { "isolated",             ICMP_UNREACH_ISOLATED },
 666       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 667       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 668       { "tosnet",               ICMP_UNREACH_TOSNET },
 669       { "toshost",              ICMP_UNREACH_TOSHOST },
 670       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 671       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 672       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 673       { NULL, 0 }
 674 };
 675
 676 static void
 677 fill_reject_code(u_short *codep, char *str)
 678 {
 679         int val;
 680         char *s;
 681
 682         val = strtoul(str, &s, 0);
 683         if (s == str || *s != '\0' || val >= 0x100)
 684                 val = match_token(icmpcodes, str);
 685         if (val < 0)
 686                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 687         *codep = val;
 688         return;
 689 }
 690
 691 static void
 692 print_reject_code(uint16_t code)
 693 {
 694         char const *s = match_value(icmpcodes, code);
 695
 696         if (s != NULL)
 697                 printf("unreach %s", s);
 698         else
 699                 printf("unreach %u", code);
 700 }
 701
 702 /*
 703  * Returns the number of bits set (from left) in a contiguous bitmask,
 704  * or -1 if the mask is not contiguous.
 705  * XXX this needs a proper fix.
 706  * This effectively works on masks in big-endian (network) format.
 707  * when compiled on little endian architectures.
 708  *
 709  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 710  * the first bit on the wire is bit 0 of the first byte.
 711  * len is the max length in bits.
 712  */
 713 int
 714 contigmask(uint8_t *p, int len)
 715 {
 716         int i, n;
 717
 718         for (i=0; i<len ; i++)
 719                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 720                         break;
 721         for (n=i+1; n < len; n++)
 722                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 723                         return -1; /* mask not contiguous */
 724         return i;
 725 }
 726
 727 /*
 728  * print flags set/clear in the two bitmasks passed as parameters.
 729  * There is a specialized check for f_tcpflags.
 730  */
 731 static void
 732 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 733 {
 734         char const *comma = "";
 735         int i;
 736         uint8_t set = cmd->arg1 & 0xff;
 737         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 738
 739         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 740                 printf(" setup");
 741                 return;
 742         }
 743
 744         printf(" %s ", name);
 745         for (i=0; list[i].x != 0; i++) {
 746                 if (set & list[i].x) {
 747                         set &= ~list[i].x;
 748                         printf("%s%s", comma, list[i].s);
 749                         comma = ",";
 750                 }
 751                 if (clear & list[i].x) {
 752                         clear &= ~list[i].x;
 753                         printf("%s!%s", comma, list[i].s);
 754                         comma = ",";
 755                 }
 756         }
 757 }
 758
 759 /*
 760  * Print the ip address contained in a command.
 761  */
 762 static void
 763 print_ip(ipfw_insn_ip *cmd, char const *s)
 764 {
 765         struct hostent *he = NULL;
 766         uint32_t len = F_LEN((ipfw_insn *)cmd);
 767         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 768
 769         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 770                 uint32_t d = a[1];
 771                 const char *arg = "<invalid>";
 772
 773                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 774                         arg = match_value(rule_options, lookup_key[d]);
 775                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 776                         arg, cmd->o.arg1);
 777                 return;
 778         }
 779         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 780
 781         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 782                 printf("me");
 783                 return;
 784         }
 785         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 786             cmd->o.opcode == O_IP_DST_LOOKUP) {
 787                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 788                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 789                         printf(",%u", *a);
 790                 printf(")");
 791                 return;
 792         }
 793         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 794                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 795                 int i, j;
 796                 char comma = '{';
 797
 798                 x = cmd->o.arg1 - 1;
 799                 x = htonl( ~x );
 800                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 801                 printf("%s/%d", inet_ntoa(cmd->addr),
 802                         contigmask((uint8_t *)&x, 32));
 803                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 804                 x &= 0xff; /* base */
 805                 /*
 806                  * Print bits and ranges.
 807                  * Locate first bit set (i), then locate first bit unset (j).
 808                  * If we have 3+ consecutive bits set, then print them as a
 809                  * range, otherwise only print the initial bit and rescan.
 810                  */
 811                 for (i=0; i < cmd->o.arg1; i++)
 812                         if (map[i/32] & (1<<(i & 31))) {
 813                                 for (j=i+1; j < cmd->o.arg1; j++)
 814                                         if (!(map[ j/32] & (1<<(j & 31))))
 815                                                 break;
 816                                 printf("%c%d", comma, i+x);
 817                                 if (j>i+2) { /* range has at least 3 elements */
 818                                         printf("-%d", j-1+x);
 819                                         i = j-1;
 820                                 }
 821                                 comma = ',';
 822                         }
 823                 printf("}");
 824                 return;
 825         }
 826         /*
 827          * len == 2 indicates a single IP, whereas lists of 1 or more
 828          * addr/mask pairs have len = (2n+1). We convert len to n so we
 829          * use that to count the number of entries.
 830          */
 831     for (len = len / 2; len > 0; len--, a += 2) {
 832         int mb =        /* mask length */
 833             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 834                 32 : contigmask((uint8_t *)&(a[1]), 32);
 835         if (mb == 32 && co.do_resolv)
 836                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 837         if (he != NULL)         /* resolved to name */
 838                 printf("%s", he->h_name);
 839         else if (mb == 0)       /* any */
 840                 printf("any");
 841         else {          /* numeric IP followed by some kind of mask */
 842                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 843                 if (mb < 0)
 844                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 845                 else if (mb < 32)
 846                         printf("/%d", mb);
 847         }
 848         if (len > 1)
 849                 printf(",");
 850     }
 851 }
 852
 853 /*
 854  * prints a MAC address/mask pair
 855  */
 856 static void
 857 print_mac(uint8_t *addr, uint8_t *mask)
 858 {
 859         int l = contigmask(mask, 48);
 860
 861         if (l == 0)
 862                 printf(" any");
 863         else {
 864                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 865                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 866                 if (l == -1)
 867                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 868                             mask[0], mask[1], mask[2],
 869                             mask[3], mask[4], mask[5]);
 870                 else if (l < 48)
 871                         printf("/%d", l);
 872         }
 873 }
 874
 875 static void
 876 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 877 {
 878         uint8_t type;
 879
 880         cmd->d[0] = 0;
 881         while (*av) {
 882                 if (*av == ',')
 883                         av++;
 884
 885                 type = strtoul(av, &av, 0);
 886
 887                 if (*av != ',' && *av != '\0')
 888                         errx(EX_DATAERR, "invalid ICMP type");
 889
 890                 if (type > 31)
 891                         errx(EX_DATAERR, "ICMP type out of range");
 892
 893                 cmd->d[0] |= 1 << type;
 894         }
 895         cmd->o.opcode = O_ICMPTYPE;
 896         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 897 }
 898
 899 static void
 900 print_icmptypes(ipfw_insn_u32 *cmd)
 901 {
 902         int i;
 903         char sep= ' ';
 904
 905         printf(" icmptypes");
 906         for (i = 0; i < 32; i++) {
 907                 if ( (cmd->d[0] & (1 << (i))) == 0)
 908                         continue;
 909                 printf("%c%d", sep, i);
 910                 sep = ',';
 911         }
 912 }
 913
 914 /*
 915  * show_ipfw() prints the body of an ipfw rule.
 916  * Because the standard rule has at least proto src_ip dst_ip, we use
 917  * a helper function to produce these entries if not provided explicitly.
 918  * The first argument is the list of fields we have, the second is
 919  * the list of fields we want to be printed.
 920  *
 921  * Special cases if we have provided a MAC header:
 922  *   + if the rule does not contain IP addresses/ports, do not print them;
 923  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 924  *
 925  * Once we have 'have_options', IP header fields are printed as options.
 926  */
 927 #define HAVE_PROTO      0x0001
 928 #define HAVE_SRCIP      0x0002
 929 #define HAVE_DSTIP      0x0004
 930 #define HAVE_PROTO4     0x0008
 931 #define HAVE_PROTO6     0x0010
 932 #define HAVE_IP         0x0100
 933 #define HAVE_OPTIONS    0x8000
 934
 935 static void
 936 show_prerequisites(int *flags, int want, int cmd __unused)
 937 {
 938         if (co.comment_only)
 939                 return;
 940         if ( (*flags & HAVE_IP) == HAVE_IP)
 941                 *flags |= HAVE_OPTIONS;
 942
 943         if ( !(*flags & HAVE_OPTIONS)) {
 944                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 945                         if ( (*flags & HAVE_PROTO4))
 946                                 printf(" ip4");
 947                         else if ( (*flags & HAVE_PROTO6))
 948                                 printf(" ip6");
 949                         else
 950                                 printf(" ip");
 951                 }
 952                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 953                         printf(" from any");
 954                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 955                         printf(" to any");
 956         }
 957         *flags |= want;
 958 }
 959
 960 static void
 961 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 962 {
 963         static int twidth = 0;
 964         int l;
 965         ipfw_insn *cmd, *tagptr = NULL;
 966         const char *comment = NULL;     /* ptr to comment if we have one */
 967         int proto = 0;          /* default */
 968         int flags = 0;  /* prerequisites */
 969         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 970         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 971         int or_block = 0;       /* we are in an or block */
 972         uint32_t set_disable;
 973
 974         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 975
 976         if (set_disable & (1 << rule->set)) { /* disabled */
 977                 if (!co.show_sets)
 978                         return;
 979                 else
 980                         printf("# DISABLED ");
 981         }
 982         printf("%05u ", rule->rulenum);
 983
 984         if (pcwidth > 0 || bcwidth > 0) {
 985                 pr_u64(&rule->pcnt, pcwidth);
 986                 pr_u64(&rule->bcnt, bcwidth);
 987         }
 988
 989         if (co.do_time == 2)
 990                 printf("%10u ", rule->timestamp);
 991         else if (co.do_time == 1) {
 992                 char timestr[30];
 993                 time_t t = (time_t)0;
 994
 995                 if (twidth == 0) {
 996                         strcpy(timestr, ctime(&t));
 997                         *strchr(timestr, '\n') = '\0';
 998                         twidth = strlen(timestr);
 999                 }
1000                 if (rule->timestamp) {
1001                         t = _long_to_time(rule->timestamp);
1002
1003                         strcpy(timestr, ctime(&t));
1004                         *strchr(timestr, '\n') = '\0';
1005                         printf("%s ", timestr);
1006                 } else {
1007                         printf("%*s", twidth, " ");
1008                 }
1009         }
1010
1011         if (co.show_sets)
1012                 printf("set %d ", rule->set);
1013
1014         /*
1015          * print the optional "match probability"
1016          */
1017         if (rule->cmd_len > 0) {
1018                 cmd = rule->cmd ;
1019                 if (cmd->opcode == O_PROB) {
1020                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1021                         double d = 1.0 * p->d[0];
1022
1023                         d = (d / 0x7fffffff);
1024                         printf("prob %f ", d);
1025                 }
1026         }
1027
1028         /*
1029          * first print actions
1030          */
1031         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1032                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1033                 switch(cmd->opcode) {
1034                 case O_CHECK_STATE:
1035                         printf("check-state");
1036                         /* avoid printing anything else */
1037                         flags = HAVE_PROTO | HAVE_SRCIP |
1038                                 HAVE_DSTIP | HAVE_IP;
1039                         break;
1040
1041                 case O_ACCEPT:
1042                         printf("allow");
1043                         break;
1044
1045                 case O_COUNT:
1046                         printf("count");
1047                         break;
1048
1049                 case O_DENY:
1050                         printf("deny");
1051                         break;
1052
1053                 case O_REJECT:
1054                         if (cmd->arg1 == ICMP_REJECT_RST)
1055                                 printf("reset");
1056                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1057                                 printf("reject");
1058                         else
1059                                 print_reject_code(cmd->arg1);
1060                         break;
1061
1062                 case O_UNREACH6:
1063                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1064                                 printf("reset6");
1065                         else
1066                                 print_unreach6_code(cmd->arg1);
1067                         break;
1068
1069                 case O_SKIPTO:
1070                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1071                         break;
1072
1073                 case O_PIPE:
1074                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1075                         break;
1076
1077                 case O_QUEUE:
1078                         PRINT_UINT_ARG("queue ", cmd->arg1);
1079                         break;
1080
1081                 case O_DIVERT:
1082                         PRINT_UINT_ARG("divert ", cmd->arg1);
1083                         break;
1084
1085                 case O_TEE:
1086                         PRINT_UINT_ARG("tee ", cmd->arg1);
1087                         break;
1088
1089                 case O_NETGRAPH:
1090                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1091                         break;
1092
1093                 case O_NGTEE:
1094                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1095                         break;
1096
1097                 case O_FORWARD_IP:
1098                     {
1099                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1100
1101                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1102                                 printf("fwd tablearg");
1103                         } else {
1104                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1105                         }
1106                         if (s->sa.sin_port)
1107                                 printf(",%d", s->sa.sin_port);
1108                     }
1109                         break;
1110
1111                 case O_LOG: /* O_LOG is printed last */
1112                         logptr = (ipfw_insn_log *)cmd;
1113                         break;
1114
1115                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1116                         altqptr = (ipfw_insn_altq *)cmd;
1117                         break;
1118
1119                 case O_TAG:
1120                         tagptr = cmd;
1121                         break;
1122
1123                 case O_NAT:
1124                         if (cmd->arg1 != 0)
1125                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1126                         else
1127                                 printf("nat global");
1128                         break;
1129
1130                 case O_SETFIB:
1131                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1132                         break;
1133
1134                 case O_REASS:
1135                         printf("reass");
1136                         break;
1137
1138                 default:
1139                         printf("** unrecognized action %d len %d ",
1140                                 cmd->opcode, cmd->len);
1141                 }
1142         }
1143         if (logptr) {
1144                 if (logptr->max_log > 0)
1145                         printf(" log logamount %d", logptr->max_log);
1146                 else
1147                         printf(" log");
1148         }
1149 #ifndef NO_ALTQ
1150         if (altqptr) {
1151                 print_altq_cmd(altqptr);
1152         }
1153 #endif
1154         if (tagptr) {
1155                 if (tagptr->len & F_NOT)
1156                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1157                 else
1158                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1159         }
1160
1161         /*
1162          * then print the body.
1163          */
1164         for (l = rule->act_ofs, cmd = rule->cmd ;
1165                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1166                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1167                         continue;
1168                 if (cmd->opcode == O_IP4) {
1169                         flags |= HAVE_PROTO4;
1170                         break;
1171                 } else if (cmd->opcode == O_IP6) {
1172                         flags |= HAVE_PROTO6;
1173                         break;
1174                 }
1175         }
1176         if (rule->_pad & 1) {   /* empty rules before options */
1177                 if (!co.do_compact) {
1178                         show_prerequisites(&flags, HAVE_PROTO, 0);
1179                         printf(" from any to any");
1180                 }
1181                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1182                          HAVE_SRCIP | HAVE_DSTIP;
1183         }
1184
1185         if (co.comment_only)
1186                 comment = "...";
1187
1188         for (l = rule->act_ofs, cmd = rule->cmd ;
1189                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1190                 /* useful alias */
1191                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1192
1193                 if (co.comment_only) {
1194                         if (cmd->opcode != O_NOP)
1195                                 continue;
1196                         printf(" // %s\n", (char *)(cmd + 1));
1197                         return;
1198                 }
1199
1200                 show_prerequisites(&flags, 0, cmd->opcode);
1201
1202                 switch(cmd->opcode) {
1203                 case O_PROB:
1204                         break;  /* done already */
1205
1206                 case O_PROBE_STATE:
1207                         break; /* no need to print anything here */
1208
1209                 case O_IP_SRC:
1210                 case O_IP_SRC_LOOKUP:
1211                 case O_IP_SRC_MASK:
1212                 case O_IP_SRC_ME:
1213                 case O_IP_SRC_SET:
1214                         show_prerequisites(&flags, HAVE_PROTO, 0);
1215                         if (!(flags & HAVE_SRCIP))
1216                                 printf(" from");
1217                         if ((cmd->len & F_OR) && !or_block)
1218                                 printf(" {");
1219                         print_ip((ipfw_insn_ip *)cmd,
1220                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1221                         flags |= HAVE_SRCIP;
1222                         break;
1223
1224                 case O_IP_DST:
1225                 case O_IP_DST_LOOKUP:
1226                 case O_IP_DST_MASK:
1227                 case O_IP_DST_ME:
1228                 case O_IP_DST_SET:
1229                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1230                         if (!(flags & HAVE_DSTIP))
1231                                 printf(" to");
1232                         if ((cmd->len & F_OR) && !or_block)
1233                                 printf(" {");
1234                         print_ip((ipfw_insn_ip *)cmd,
1235                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1236                         flags |= HAVE_DSTIP;
1237                         break;
1238
1239                 case O_IP6_SRC:
1240                 case O_IP6_SRC_MASK:
1241                 case O_IP6_SRC_ME:
1242                         show_prerequisites(&flags, HAVE_PROTO, 0);
1243                         if (!(flags & HAVE_SRCIP))
1244                                 printf(" from");
1245                         if ((cmd->len & F_OR) && !or_block)
1246                                 printf(" {");
1247                         print_ip6((ipfw_insn_ip6 *)cmd,
1248                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1249                         flags |= HAVE_SRCIP | HAVE_PROTO;
1250                         break;
1251
1252                 case O_IP6_DST:
1253                 case O_IP6_DST_MASK:
1254                 case O_IP6_DST_ME:
1255                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1256                         if (!(flags & HAVE_DSTIP))
1257                                 printf(" to");
1258                         if ((cmd->len & F_OR) && !or_block)
1259                                 printf(" {");
1260                         print_ip6((ipfw_insn_ip6 *)cmd,
1261                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1262                         flags |= HAVE_DSTIP;
1263                         break;
1264
1265                 case O_FLOW6ID:
1266                 print_flow6id( (ipfw_insn_u32 *) cmd );
1267                 flags |= HAVE_OPTIONS;
1268                 break;
1269
1270                 case O_IP_DSTPORT:
1271                         show_prerequisites(&flags,
1272                                 HAVE_PROTO | HAVE_SRCIP |
1273                                 HAVE_DSTIP | HAVE_IP, 0);
1274                 case O_IP_SRCPORT:
1275                         show_prerequisites(&flags,
1276                                 HAVE_PROTO | HAVE_SRCIP, 0);
1277                         if ((cmd->len & F_OR) && !or_block)
1278                                 printf(" {");
1279                         if (cmd->len & F_NOT)
1280                                 printf(" not");
1281                         print_newports((ipfw_insn_u16 *)cmd, proto,
1282                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1283                         break;
1284
1285                 case O_PROTO: {
1286                         struct protoent *pe = NULL;
1287
1288                         if ((cmd->len & F_OR) && !or_block)
1289                                 printf(" {");
1290                         if (cmd->len & F_NOT)
1291                                 printf(" not");
1292                         proto = cmd->arg1;
1293                         pe = getprotobynumber(cmd->arg1);
1294                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1295                             !(flags & HAVE_PROTO))
1296                                 show_prerequisites(&flags,
1297                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1298                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1299                         if (flags & HAVE_OPTIONS)
1300                                 printf(" proto");
1301                         if (pe)
1302                                 printf(" %s", pe->p_name);
1303                         else
1304                                 printf(" %u", cmd->arg1);
1305                         }
1306                         flags |= HAVE_PROTO;
1307                         break;
1308
1309                 default: /*options ... */
1310                         if (!(cmd->len & (F_OR|F_NOT)))
1311                                 if (((cmd->opcode == O_IP6) &&
1312                                     (flags & HAVE_PROTO6)) ||
1313                                     ((cmd->opcode == O_IP4) &&
1314                                     (flags & HAVE_PROTO4)))
1315                                         break;
1316                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1317                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1318                         if ((cmd->len & F_OR) && !or_block)
1319                                 printf(" {");
1320                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1321                                 printf(" not");
1322                         switch(cmd->opcode) {
1323                         case O_MACADDR2: {
1324                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1325
1326                                 printf(" MAC");
1327                                 print_mac(m->addr, m->mask);
1328                                 print_mac(m->addr + 6, m->mask + 6);
1329                                 }
1330                                 break;
1331
1332                         case O_MAC_TYPE:
1333                                 print_newports((ipfw_insn_u16 *)cmd,
1334                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1335                                 break;
1336
1337
1338                         case O_FRAG:
1339                                 printf(" frag");
1340                                 break;
1341
1342                         case O_FIB:
1343                                 printf(" fib %u", cmd->arg1 );
1344                                 break;
1345                         case O_SOCKARG:
1346                                 printf(" sockarg");
1347                                 break;
1348
1349                         case O_IN:
1350                                 printf(cmd->len & F_NOT ? " out" : " in");
1351                                 break;
1352
1353                         case O_DIVERTED:
1354                                 switch (cmd->arg1) {
1355                                 case 3:
1356                                         printf(" diverted");
1357                                         break;
1358                                 case 1:
1359                                         printf(" diverted-loopback");
1360                                         break;
1361                                 case 2:
1362                                         printf(" diverted-output");
1363                                         break;
1364                                 default:
1365                                         printf(" diverted-?<%u>", cmd->arg1);
1366                                         break;
1367                                 }
1368                                 break;
1369
1370                         case O_LAYER2:
1371                                 printf(" layer2");
1372                                 break;
1373                         case O_XMIT:
1374                         case O_RECV:
1375                         case O_VIA:
1376                             {
1377                                 char const *s;
1378                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1379
1380                                 if (cmd->opcode == O_XMIT)
1381                                         s = "xmit";
1382                                 else if (cmd->opcode == O_RECV)
1383                                         s = "recv";
1384                                 else /* if (cmd->opcode == O_VIA) */
1385                                         s = "via";
1386                                 if (cmdif->name[0] == '\0')
1387                                         printf(" %s %s", s,
1388                                             inet_ntoa(cmdif->p.ip));
1389                                 else
1390                                         printf(" %s %s", s, cmdif->name);
1391
1392                                 break;
1393                             }
1394                         case O_IPID:
1395                                 if (F_LEN(cmd) == 1)
1396                                     printf(" ipid %u", cmd->arg1 );
1397                                 else
1398                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1399                                         O_IPID);
1400                                 break;
1401
1402                         case O_IPTTL:
1403                                 if (F_LEN(cmd) == 1)
1404                                     printf(" ipttl %u", cmd->arg1 );
1405                                 else
1406                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1407                                         O_IPTTL);
1408                                 break;
1409
1410                         case O_IPVER:
1411                                 printf(" ipver %u", cmd->arg1 );
1412                                 break;
1413
1414                         case O_IPPRECEDENCE:
1415                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1416                                 break;
1417
1418                         case O_IPLEN:
1419                                 if (F_LEN(cmd) == 1)
1420                                     printf(" iplen %u", cmd->arg1 );
1421                                 else
1422                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1423                                         O_IPLEN);
1424                                 break;
1425
1426                         case O_IPOPT:
1427                                 print_flags("ipoptions", cmd, f_ipopts);
1428                                 break;
1429
1430                         case O_IPTOS:
1431                                 print_flags("iptos", cmd, f_iptos);
1432                                 break;
1433
1434                         case O_ICMPTYPE:
1435                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1436                                 break;
1437
1438                         case O_ESTAB:
1439                                 printf(" established");
1440                                 break;
1441
1442                         case O_TCPDATALEN:
1443                                 if (F_LEN(cmd) == 1)
1444                                     printf(" tcpdatalen %u", cmd->arg1 );
1445                                 else
1446                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1447                                         O_TCPDATALEN);
1448                                 break;
1449
1450                         case O_TCPFLAGS:
1451                                 print_flags("tcpflags", cmd, f_tcpflags);
1452                                 break;
1453
1454                         case O_TCPOPTS:
1455                                 print_flags("tcpoptions", cmd, f_tcpopts);
1456                                 break;
1457
1458                         case O_TCPWIN:
1459                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1460                                 break;
1461
1462                         case O_TCPACK:
1463                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1464                                 break;
1465
1466                         case O_TCPSEQ:
1467                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1468                                 break;
1469
1470                         case O_UID:
1471                             {
1472                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1473
1474                                 if (pwd)
1475                                         printf(" uid %s", pwd->pw_name);
1476                                 else
1477                                         printf(" uid %u", cmd32->d[0]);
1478                             }
1479                                 break;
1480
1481                         case O_GID:
1482                             {
1483                                 struct group *grp = getgrgid(cmd32->d[0]);
1484
1485                                 if (grp)
1486                                         printf(" gid %s", grp->gr_name);
1487                                 else
1488                                         printf(" gid %u", cmd32->d[0]);
1489                             }
1490                                 break;
1491
1492                         case O_JAIL:
1493                                 printf(" jail %d", cmd32->d[0]);
1494                                 break;
1495
1496                         case O_VERREVPATH:
1497                                 printf(" verrevpath");
1498                                 break;
1499
1500                         case O_VERSRCREACH:
1501                                 printf(" versrcreach");
1502                                 break;
1503
1504                         case O_ANTISPOOF:
1505                                 printf(" antispoof");
1506                                 break;
1507
1508                         case O_IPSEC:
1509                                 printf(" ipsec");
1510                                 break;
1511
1512                         case O_NOP:
1513                                 comment = (char *)(cmd + 1);
1514                                 break;
1515
1516                         case O_KEEP_STATE:
1517                                 printf(" keep-state");
1518                                 break;
1519
1520                         case O_LIMIT: {
1521                                 struct _s_x *p = limit_masks;
1522                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1523                                 uint8_t x = c->limit_mask;
1524                                 char const *comma = " ";
1525
1526                                 printf(" limit");
1527                                 for (; p->x != 0 ; p++)
1528                                         if ((x & p->x) == p->x) {
1529                                                 x &= ~p->x;
1530                                                 printf("%s%s", comma, p->s);
1531                                                 comma = ",";
1532                                         }
1533                                 PRINT_UINT_ARG(" ", c->conn_limit);
1534                                 break;
1535                         }
1536
1537                         case O_IP6:
1538                                 printf(" ip6");
1539                                 break;
1540
1541                         case O_IP4:
1542                                 printf(" ip4");
1543                                 break;
1544
1545                         case O_ICMP6TYPE:
1546                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1547                                 break;
1548
1549                         case O_EXT_HDR:
1550                                 print_ext6hdr( (ipfw_insn *) cmd );
1551                                 break;
1552
1553                         case O_TAGGED:
1554                                 if (F_LEN(cmd) == 1)
1555                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1556                                 else
1557                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1558                                             O_TAGGED);
1559                                 break;
1560
1561                         default:
1562                                 printf(" [opcode %d len %d]",
1563                                     cmd->opcode, cmd->len);
1564                         }
1565                 }
1566                 if (cmd->len & F_OR) {
1567                         printf(" or");
1568                         or_block = 1;
1569                 } else if (or_block) {
1570                         printf(" }");
1571                         or_block = 0;
1572                 }
1573         }
1574         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1575                                               | HAVE_IP, 0);
1576         if (comment)
1577                 printf(" // %s", comment);
1578         printf("\n");
1579 }
1580
1581 static void
1582 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1583 {
1584         struct protoent *pe;
1585         struct in_addr a;
1586         uint16_t rulenum;
1587         char buf[INET6_ADDRSTRLEN];
1588
1589         if (!co.do_expired) {
1590                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1591                         return;
1592         }
1593         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1594         printf("%05d", rulenum);
1595         if (pcwidth > 0 || bcwidth > 0) {
1596                 printf(" ");
1597                 pr_u64(&d->pcnt, pcwidth);
1598                 pr_u64(&d->bcnt, bcwidth);
1599                 printf("(%ds)", d->expire);
1600         }
1601         switch (d->dyn_type) {
1602         case O_LIMIT_PARENT:
1603                 printf(" PARENT %d", d->count);
1604                 break;
1605         case O_LIMIT:
1606                 printf(" LIMIT");
1607                 break;
1608         case O_KEEP_STATE: /* bidir, no mask */
1609                 printf(" STATE");
1610                 break;
1611         }
1612
1613         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1614                 printf(" %s", pe->p_name);
1615         else
1616                 printf(" proto %u", d->id.proto);
1617
1618         if (d->id.addr_type == 4) {
1619                 a.s_addr = htonl(d->id.src_ip);
1620                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1621
1622                 a.s_addr = htonl(d->id.dst_ip);
1623                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1624         } else if (d->id.addr_type == 6) {
1625                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1626                     sizeof(buf)), d->id.src_port);
1627                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1628                     sizeof(buf)), d->id.dst_port);
1629         } else
1630                 printf(" UNKNOWN <-> UNKNOWN\n");
1631
1632         printf("\n");
1633 }
1634
1635 /*
1636  * This one handles all set-related commands
1637  *      ipfw set { show | enable | disable }
1638  *      ipfw set swap X Y
1639  *      ipfw set move X to Y
1640  *      ipfw set move rule X to Y
1641  */
1642 void
1643 ipfw_sets_handler(char *av[])
1644 {
1645         uint32_t set_disable, masks[2];
1646         int i, nbytes;
1647         uint16_t rulenum;
1648         uint8_t cmd, new_set;
1649
1650         av++;
1651
1652         if (av[0] == NULL)
1653                 errx(EX_USAGE, "set needs command");
1654         if (_substrcmp(*av, "show") == 0) {
1655                 void *data = NULL;
1656                 char const *msg;
1657                 int nalloc;
1658
1659                 nalloc = nbytes = sizeof(struct ip_fw);
1660                 while (nbytes >= nalloc) {
1661                         if (data)
1662                                 free(data);
1663                         nalloc = nalloc * 2 + 200;
1664                         nbytes = nalloc;
1665                         data = safe_calloc(1, nbytes);
1666                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1667                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1668                 }
1669
1670                 bcopy(&((struct ip_fw *)data)->next_rule,
1671                         &set_disable, sizeof(set_disable));
1672
1673                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1674                         if ((set_disable & (1<<i))) {
1675                                 printf("%s %d", msg, i);
1676                                 msg = "";
1677                         }
1678                 msg = (set_disable) ? " enable" : "enable";
1679                 for (i = 0; i < RESVD_SET; i++)
1680                         if (!(set_disable & (1<<i))) {
1681                                 printf("%s %d", msg, i);
1682                                 msg = "";
1683                         }
1684                 printf("\n");
1685         } else if (_substrcmp(*av, "swap") == 0) {
1686                 av++;
1687                 if ( av[0] == NULL || av[1] == NULL )
1688                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1689                 rulenum = atoi(av[0]);
1690                 new_set = atoi(av[1]);
1691                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1692                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1693                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1694                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1695                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1696                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1697         } else if (_substrcmp(*av, "move") == 0) {
1698                 av++;
1699                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1700                         cmd = 2;
1701                         av++;
1702                 } else
1703                         cmd = 3;
1704                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1705                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1706                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1707                 rulenum = atoi(av[0]);
1708                 new_set = atoi(av[2]);
1709                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1710                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1711                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1712                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1713                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1714                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1715                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1716         } else if (_substrcmp(*av, "disable") == 0 ||
1717                    _substrcmp(*av, "enable") == 0 ) {
1718                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1719
1720                 av++;
1721                 masks[0] = masks[1] = 0;
1722
1723                 while (av[0]) {
1724                         if (isdigit(**av)) {
1725                                 i = atoi(*av);
1726                                 if (i < 0 || i > RESVD_SET)
1727                                         errx(EX_DATAERR,
1728                                             "invalid set number %d\n", i);
1729                                 masks[which] |= (1<<i);
1730                         } else if (_substrcmp(*av, "disable") == 0)
1731                                 which = 0;
1732                         else if (_substrcmp(*av, "enable") == 0)
1733                                 which = 1;
1734                         else
1735                                 errx(EX_DATAERR,
1736                                         "invalid set command %s\n", *av);
1737                         av++;
1738                 }
1739                 if ( (masks[0] & masks[1]) != 0 )
1740                         errx(EX_DATAERR,
1741                             "cannot enable and disable the same set\n");
1742
1743                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1744                 if (i)
1745                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1746         } else
1747                 errx(EX_USAGE, "invalid set command %s\n", *av);
1748 }
1749
1750 void
1751 ipfw_sysctl_handler(char *av[], int which)
1752 {
1753         av++;
1754
1755         if (av[0] == NULL) {
1756                 warnx("missing keyword to enable/disable\n");
1757         } else if (_substrcmp(*av, "firewall") == 0) {
1758                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1759                     &which, sizeof(which));
1760                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1761                     &which, sizeof(which));
1762         } else if (_substrcmp(*av, "one_pass") == 0) {
1763                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1764                     &which, sizeof(which));
1765         } else if (_substrcmp(*av, "debug") == 0) {
1766                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1767                     &which, sizeof(which));
1768         } else if (_substrcmp(*av, "verbose") == 0) {
1769                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1770                     &which, sizeof(which));
1771         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1772                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1773                     &which, sizeof(which));
1774 #ifndef NO_ALTQ
1775         } else if (_substrcmp(*av, "altq") == 0) {
1776                 altq_set_enabled(which);
1777 #endif
1778         } else {
1779                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1780         }
1781 }
1782
1783 void
1784 ipfw_list(int ac, char *av[], int show_counters)
1785 {
1786         struct ip_fw *r;
1787         ipfw_dyn_rule *dynrules, *d;
1788
1789 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1790         char *lim;
1791         void *data = NULL;
1792         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1793         int exitval = EX_OK;
1794         int lac;
1795         char **lav;
1796         u_long rnum, last;
1797         char *endptr;
1798         int seen = 0;
1799         uint8_t set;
1800
1801         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1802         int nalloc = 1024;      /* start somewhere... */
1803
1804         last = 0;
1805
1806         if (co.test_only) {
1807                 fprintf(stderr, "Testing only, list disabled\n");
1808                 return;
1809         }
1810         if (co.do_pipe) {
1811                 dummynet_list(ac, av, show_counters);
1812                 return;
1813         }
1814
1815         ac--;
1816         av++;
1817
1818         /* get rules or pipes from kernel, resizing array as necessary */
1819         nbytes = nalloc;
1820
1821         while (nbytes >= nalloc) {
1822                 nalloc = nalloc * 2 + 200;
1823                 nbytes = nalloc;
1824                 data = safe_realloc(data, nbytes);
1825                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1826                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1827                                 co.do_pipe ? "DUMMYNET" : "FW");
1828         }
1829
1830         /*
1831          * Count static rules. They have variable size so we
1832          * need to scan the list to count them.
1833          */
1834         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1835                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1836                     ++nstat, r = NEXT(r) )
1837                 ; /* nothing */
1838
1839         /*
1840          * Count dynamic rules. This is easier as they have
1841          * fixed size.
1842          */
1843         r = NEXT(r);
1844         dynrules = (ipfw_dyn_rule *)r ;
1845         n = (char *)r - (char *)data;
1846         ndyn = (nbytes - n) / sizeof *dynrules;
1847
1848         /* if showing stats, figure out column widths ahead of time */
1849         bcwidth = pcwidth = 0;
1850         if (show_counters) {
1851                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1852                         /* skip rules from another set */
1853                         if (co.use_set && r->set != co.use_set - 1)
1854                                 continue;
1855
1856                         /* packet counter */
1857                         width = pr_u64(&r->pcnt, 0);
1858                         if (width > pcwidth)
1859                                 pcwidth = width;
1860
1861                         /* byte counter */
1862                         width = pr_u64(&r->bcnt, 0);
1863                         if (width > bcwidth)
1864                                 bcwidth = width;
1865                 }
1866         }
1867         if (co.do_dynamic && ndyn) {
1868                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1869                         if (co.use_set) {
1870                                 /* skip rules from another set */
1871                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1872                                       &set, sizeof(uint8_t));
1873                                 if (set != co.use_set - 1)
1874                                         continue;
1875                         }
1876                         width = pr_u64(&d->pcnt, 0);
1877                         if (width > pcwidth)
1878                                 pcwidth = width;
1879
1880                         width = pr_u64(&d->bcnt, 0);
1881                         if (width > bcwidth)
1882                                 bcwidth = width;
1883                 }
1884         }
1885         /* if no rule numbers were specified, list all rules */
1886         if (ac == 0) {
1887                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1888                         if (co.use_set && r->set != co.use_set - 1)
1889                                 continue;
1890                         show_ipfw(r, pcwidth, bcwidth);
1891                 }
1892
1893                 if (co.do_dynamic && ndyn) {
1894                         printf("## Dynamic rules (%d):\n", ndyn);
1895                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1896                                 if (co.use_set) {
1897                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1898                                               &set, sizeof(uint8_t));
1899                                         if (set != co.use_set - 1)
1900                                                 continue;
1901                                 }
1902                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1903                 }
1904                 }
1905                 goto done;
1906         }
1907
1908         /* display specific rules requested on command line */
1909
1910         for (lac = ac, lav = av; lac != 0; lac--) {
1911                 /* convert command line rule # */
1912                 last = rnum = strtoul(*lav++, &endptr, 10);
1913                 if (*endptr == '-')
1914                         last = strtoul(endptr+1, &endptr, 10);
1915                 if (*endptr) {
1916                         exitval = EX_USAGE;
1917                         warnx("invalid rule number: %s", *(lav - 1));
1918                         continue;
1919                 }
1920                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1921                         if (r->rulenum > last)
1922                                 break;
1923                         if (co.use_set && r->set != co.use_set - 1)
1924                                 continue;
1925                         if (r->rulenum >= rnum && r->rulenum <= last) {
1926                                 show_ipfw(r, pcwidth, bcwidth);
1927                                 seen = 1;
1928                         }
1929                 }
1930                 if (!seen) {
1931                         /* give precedence to other error(s) */
1932                         if (exitval == EX_OK)
1933                                 exitval = EX_UNAVAILABLE;
1934                         warnx("rule %lu does not exist", rnum);
1935                 }
1936         }
1937
1938         if (co.do_dynamic && ndyn) {
1939                 printf("## Dynamic rules:\n");
1940                 for (lac = ac, lav = av; lac != 0; lac--) {
1941                         last = rnum = strtoul(*lav++, &endptr, 10);
1942                         if (*endptr == '-')
1943                                 last = strtoul(endptr+1, &endptr, 10);
1944                         if (*endptr)
1945                                 /* already warned */
1946                                 continue;
1947                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1948                                 uint16_t rulenum;
1949
1950                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1951                                 if (rulenum > rnum)
1952                                         break;
1953                                 if (co.use_set) {
1954                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1955                                               &set, sizeof(uint8_t));
1956                                         if (set != co.use_set - 1)
1957                                                 continue;
1958                                 }
1959                                 if (r->rulenum >= rnum && r->rulenum <= last)
1960                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1961                         }
1962                 }
1963         }
1964
1965         ac = 0;
1966
1967 done:
1968         free(data);
1969
1970         if (exitval != EX_OK)
1971                 exit(exitval);
1972 #undef NEXT
1973 }
1974
1975 static int
1976 lookup_host (char *host, struct in_addr *ipaddr)
1977 {
1978         struct hostent *he;
1979
1980         if (!inet_aton(host, ipaddr)) {
1981                 if ((he = gethostbyname(host)) == NULL)
1982                         return(-1);
1983                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1984         }
1985         return(0);
1986 }
1987
1988 /*
1989  * fills the addr and mask fields in the instruction as appropriate from av.
1990  * Update length as appropriate.
1991  * The following formats are allowed:
1992  *      me      returns O_IP_*_ME
1993  *      1.2.3.4         single IP address
1994  *      1.2.3.4:5.6.7.8 address:mask
1995  *      1.2.3.4/24      address/mask
1996  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1997  * We can have multiple comma-separated address/mask entries.
1998  */
1999 static void
2000 fill_ip(ipfw_insn_ip *cmd, char *av)
2001 {
2002         int len = 0;
2003         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2004
2005         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2006
2007         if (_substrcmp(av, "any") == 0)
2008                 return;
2009
2010         if (_substrcmp(av, "me") == 0) {
2011                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2012                 return;
2013         }
2014
2015         if (strncmp(av, "table(", 6) == 0) {
2016                 char *p = strchr(av + 6, ',');
2017
2018                 if (p)
2019                         *p++ = '\0';
2020                 cmd->o.opcode = O_IP_DST_LOOKUP;
2021                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2022                 if (p) {
2023                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2024                         d[0] = strtoul(p, NULL, 0);
2025                 } else
2026                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2027                 return;
2028         }
2029
2030     while (av) {
2031         /*
2032          * After the address we can have '/' or ':' indicating a mask,
2033          * ',' indicating another address follows, '{' indicating a
2034          * set of addresses of unspecified size.
2035          */
2036         char *t = NULL, *p = strpbrk(av, "/:,{");
2037         int masklen;
2038         char md, nd = '\0';
2039
2040         if (p) {
2041                 md = *p;
2042                 *p++ = '\0';
2043                 if ((t = strpbrk(p, ",{")) != NULL) {
2044                         nd = *t;
2045                         *t = '\0';
2046                 }
2047         } else
2048                 md = '\0';
2049
2050         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2051                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2052         switch (md) {
2053         case ':':
2054                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2055                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2056                 break;
2057         case '/':
2058                 masklen = atoi(p);
2059                 if (masklen == 0)
2060                         d[1] = htonl(0);        /* mask */
2061                 else if (masklen > 32)
2062                         errx(EX_DATAERR, "bad width ``%s''", p);
2063                 else
2064                         d[1] = htonl(~0 << (32 - masklen));
2065                 break;
2066         case '{':       /* no mask, assume /24 and put back the '{' */
2067                 d[1] = htonl(~0 << (32 - 24));
2068                 *(--p) = md;
2069                 break;
2070
2071         case ',':       /* single address plus continuation */
2072                 *(--p) = md;
2073                 /* FALLTHROUGH */
2074         case 0:         /* initialization value */
2075         default:
2076                 d[1] = htonl(~0);       /* force /32 */
2077                 break;
2078         }
2079         d[0] &= d[1];           /* mask base address with mask */
2080         if (t)
2081                 *t = nd;
2082         /* find next separator */
2083         if (p)
2084                 p = strpbrk(p, ",{");
2085         if (p && *p == '{') {
2086                 /*
2087                  * We have a set of addresses. They are stored as follows:
2088                  *   arg1       is the set size (powers of 2, 2..256)
2089                  *   addr       is the base address IN HOST FORMAT
2090                  *   mask..     is an array of arg1 bits (rounded up to
2091                  *              the next multiple of 32) with bits set
2092                  *              for each host in the map.
2093                  */
2094                 uint32_t *map = (uint32_t *)&cmd->mask;
2095                 int low, high;
2096                 int i = contigmask((uint8_t *)&(d[1]), 32);
2097
2098                 if (len > 0)
2099                         errx(EX_DATAERR, "address set cannot be in a list");
2100                 if (i < 24 || i > 31)
2101                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2102                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2103                 d[0] = ntohl(d[0]);             /* base addr in host format */
2104                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2105                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2106                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2107                         map[i] = 0;     /* clear map */
2108
2109                 av = p + 1;
2110                 low = d[0] & 0xff;
2111                 high = low + cmd->o.arg1 - 1;
2112                 /*
2113                  * Here, i stores the previous value when we specify a range
2114                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2115                  * have no previous value.
2116                  */
2117                 i = -1; /* previous value in a range */
2118                 while (isdigit(*av)) {
2119                         char *s;
2120                         int a = strtol(av, &s, 0);
2121
2122                         if (s == av) { /* no parameter */
2123                             if (*av != '}')
2124                                 errx(EX_DATAERR, "set not closed\n");
2125                             if (i != -1)
2126                                 errx(EX_DATAERR, "incomplete range %d-", i);
2127                             break;
2128                         }
2129                         if (a < low || a > high)
2130                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2131                                 a, low, high);
2132                         a -= low;
2133                         if (i == -1)    /* no previous in range */
2134                             i = a;
2135                         else {          /* check that range is valid */
2136                             if (i > a)
2137                                 errx(EX_DATAERR, "invalid range %d-%d",
2138                                         i+low, a+low);
2139                             if (*s == '-')
2140                                 errx(EX_DATAERR, "double '-' in range");
2141                         }
2142                         for (; i <= a; i++)
2143                             map[i/32] |= 1<<(i & 31);
2144                         i = -1;
2145                         if (*s == '-')
2146                             i = a;
2147                         else if (*s == '}')
2148                             break;
2149                         av = s+1;
2150                 }
2151                 return;
2152         }
2153         av = p;
2154         if (av)                 /* then *av must be a ',' */
2155                 av++;
2156
2157         /* Check this entry */
2158         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2159                 /*
2160                  * 'any' turns the entire list into a NOP.
2161                  * 'not any' never matches, so it is removed from the
2162                  * list unless it is the only item, in which case we
2163                  * report an error.
2164                  */
2165                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2166                         if (av == NULL && len == 0) /* only this entry */
2167                                 errx(EX_DATAERR, "not any never matches");
2168                 }
2169                 /* else do nothing and skip this entry */
2170                 return;
2171         }
2172         /* A single IP can be stored in an optimized format */
2173         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2174                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2175                 return;
2176         }
2177         len += 2;       /* two words... */
2178         d += 2;
2179     } /* end while */
2180     if (len + 1 > F_LEN_MASK)
2181         errx(EX_DATAERR, "address list too long");
2182     cmd->o.len |= len+1;
2183 }
2184
2185
2186 /* n2mask sets n bits of the mask */
2187 void
2188 n2mask(struct in6_addr *mask, int n)
2189 {
2190         static int      minimask[9] =
2191             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2192         u_char          *p;
2193
2194         memset(mask, 0, sizeof(struct in6_addr));
2195         p = (u_char *) mask;
2196         for (; n > 0; p++, n -= 8) {
2197                 if (n >= 8)
2198                         *p = 0xff;
2199                 else
2200                         *p = minimask[n];
2201         }
2202         return;
2203 }
2204
2205 /*
2206  * helper function to process a set of flags and set bits in the
2207  * appropriate masks.
2208  */
2209 static void
2210 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2211         struct _s_x *flags, char *p)
2212 {
2213         uint8_t set=0, clear=0;
2214
2215         while (p && *p) {
2216                 char *q;        /* points to the separator */
2217                 int val;
2218                 uint8_t *which; /* mask we are working on */
2219
2220                 if (*p == '!') {
2221                         p++;
2222                         which = &clear;
2223                 } else
2224                         which = &set;
2225                 q = strchr(p, ',');
2226                 if (q)
2227                         *q++ = '\0';
2228                 val = match_token(flags, p);
2229                 if (val <= 0)
2230                         errx(EX_DATAERR, "invalid flag %s", p);
2231                 *which |= (uint8_t)val;
2232                 p = q;
2233         }
2234         cmd->opcode = opcode;
2235         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2236         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2237 }
2238
2239
2240 void
2241 ipfw_delete(char *av[])
2242 {
2243         uint32_t rulenum;
2244         int i;
2245         int exitval = EX_OK;
2246         int do_set = 0;
2247
2248         av++;
2249         NEED1("missing rule specification");
2250         if ( *av && _substrcmp(*av, "set") == 0) {
2251                 /* Do not allow using the following syntax:
2252                  *      ipfw set N delete set M
2253                  */
2254                 if (co.use_set)
2255                         errx(EX_DATAERR, "invalid syntax");
2256                 do_set = 1;     /* delete set */
2257                 av++;
2258         }
2259
2260         /* Rule number */
2261         while (*av && isdigit(**av)) {
2262                 i = atoi(*av); av++;
2263                 if (co.do_nat) {
2264                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2265                         if (exitval) {
2266                                 exitval = EX_UNAVAILABLE;
2267                                 warn("rule %u not available", i);
2268                         }
2269                 } else if (co.do_pipe) {
2270                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2271                 } else {
2272                         if (co.use_set)
2273                                 rulenum = (i & 0xffff) | (5 << 24) |
2274                                     ((co.use_set - 1) << 16);
2275                         else
2276                         rulenum =  (i & 0xffff) | (do_set << 24);
2277                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2278                         if (i) {
2279                                 exitval = EX_UNAVAILABLE;
2280                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2281                                     rulenum);
2282                         }
2283                 }
2284         }
2285         if (exitval != EX_OK)
2286                 exit(exitval);
2287 }
2288
2289
2290 /*
2291  * fill the interface structure. We do not check the name as we can
2292  * create interfaces dynamically, so checking them at insert time
2293  * makes relatively little sense.
2294  * Interface names containing '*', '?', or '[' are assumed to be shell
2295  * patterns which match interfaces.
2296  */
2297 static void
2298 fill_iface(ipfw_insn_if *cmd, char *arg)
2299 {
2300         cmd->name[0] = '\0';
2301         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2302
2303         /* Parse the interface or address */
2304         if (strcmp(arg, "any") == 0)
2305                 cmd->o.len = 0;         /* effectively ignore this command */
2306         else if (!isdigit(*arg)) {
2307                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2308                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2309         } else if (!inet_aton(arg, &cmd->p.ip))
2310                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2311 }
2312
2313 static void
2314 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2315 {
2316         int i;
2317         size_t l;
2318         char *ap, *ptr, *optr;
2319         struct ether_addr *mac;
2320         const char *macset = "0123456789abcdefABCDEF:";
2321
2322         if (strcmp(p, "any") == 0) {
2323                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2324                         addr[i] = mask[i] = 0;
2325                 return;
2326         }
2327
2328         optr = ptr = strdup(p);
2329         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2330                 l = strlen(ap);
2331                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2332                         errx(EX_DATAERR, "Incorrect MAC address");
2333                 bcopy(mac, addr, ETHER_ADDR_LEN);
2334         } else
2335                 errx(EX_DATAERR, "Incorrect MAC address");
2336
2337         if (ptr != NULL) { /* we have mask? */
2338                 if (p[ptr - optr - 1] == '/') { /* mask len */
2339                         long ml = strtol(ptr, &ap, 10);
2340                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2341                                 errx(EX_DATAERR, "Incorrect mask length");
2342                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2343                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2344                 } else { /* mask */
2345                         l = strlen(ptr);
2346                         if (strspn(ptr, macset) != l ||
2347                             (mac = ether_aton(ptr)) == NULL)
2348                                 errx(EX_DATAERR, "Incorrect mask");
2349                         bcopy(mac, mask, ETHER_ADDR_LEN);
2350                 }
2351         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2352                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2353                         mask[i] = 0xff;
2354         }
2355         for (i = 0; i < ETHER_ADDR_LEN; i++)
2356                 addr[i] &= mask[i];
2357
2358         free(optr);
2359 }
2360
2361 /*
2362  * helper function, updates the pointer to cmd with the length
2363  * of the current command, and also cleans up the first word of
2364  * the new command in case it has been clobbered before.
2365  */
2366 static ipfw_insn *
2367 next_cmd(ipfw_insn *cmd)
2368 {
2369         cmd += F_LEN(cmd);
2370         bzero(cmd, sizeof(*cmd));
2371         return cmd;
2372 }
2373
2374 /*
2375  * Takes arguments and copies them into a comment
2376  */
2377 static void
2378 fill_comment(ipfw_insn *cmd, char **av)
2379 {
2380         int i, l;
2381         char *p = (char *)(cmd + 1);
2382
2383         cmd->opcode = O_NOP;
2384         cmd->len =  (cmd->len & (F_NOT | F_OR));
2385
2386         /* Compute length of comment string. */
2387         for (i = 0, l = 0; av[i] != NULL; i++)
2388                 l += strlen(av[i]) + 1;
2389         if (l == 0)
2390                 return;
2391         if (l > 84)
2392                 errx(EX_DATAERR,
2393                     "comment too long (max 80 chars)");
2394         l = 1 + (l+3)/4;
2395         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2396         for (i = 0; av[i] != NULL; i++) {
2397                 strcpy(p, av[i]);
2398                 p += strlen(av[i]);
2399                 *p++ = ' ';
2400         }
2401         *(--p) = '\0';
2402 }
2403
2404 /*
2405  * A function to fill simple commands of size 1.
2406  * Existing flags are preserved.
2407  */
2408 static void
2409 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2410 {
2411         cmd->opcode = opcode;
2412         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2413         cmd->arg1 = arg;
2414 }
2415
2416 /*
2417  * Fetch and add the MAC address and type, with masks. This generates one or
2418  * two microinstructions, and returns the pointer to the last one.
2419  */
2420 static ipfw_insn *
2421 add_mac(ipfw_insn *cmd, char *av[])
2422 {
2423         ipfw_insn_mac *mac;
2424
2425         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2426                 errx(EX_DATAERR, "MAC dst src");
2427
2428         cmd->opcode = O_MACADDR2;
2429         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2430
2431         mac = (ipfw_insn_mac *)cmd;
2432         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2433         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2434             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2435         return cmd;
2436 }
2437
2438 static ipfw_insn *
2439 add_mactype(ipfw_insn *cmd, char *av)
2440 {
2441         if (!av)
2442                 errx(EX_DATAERR, "missing MAC type");
2443         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2444                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2445                 cmd->opcode = O_MAC_TYPE;
2446                 return cmd;
2447         } else
2448                 return NULL;
2449 }
2450
2451 static ipfw_insn *
2452 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2453 {
2454         struct protoent *pe;
2455         char *ep;
2456         int proto;
2457
2458         proto = strtol(av, &ep, 10);
2459         if (*ep != '\0' || proto <= 0) {
2460                 if ((pe = getprotobyname(av)) == NULL)
2461                         return NULL;
2462                 proto = pe->p_proto;
2463         }
2464
2465         fill_cmd(cmd, O_PROTO, 0, proto);
2466         *protop = proto;
2467         return cmd;
2468 }
2469
2470 static ipfw_insn *
2471 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2472 {
2473         u_char proto = IPPROTO_IP;
2474
2475         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2476                 ; /* do not set O_IP4 nor O_IP6 */
2477         else if (strcmp(av, "ip4") == 0)
2478                 /* explicit "just IPv4" rule */
2479                 fill_cmd(cmd, O_IP4, 0, 0);
2480         else if (strcmp(av, "ip6") == 0) {
2481                 /* explicit "just IPv6" rule */
2482                 proto = IPPROTO_IPV6;
2483                 fill_cmd(cmd, O_IP6, 0, 0);
2484         } else
2485                 return add_proto0(cmd, av, protop);
2486
2487         *protop = proto;
2488         return cmd;
2489 }
2490
2491 static ipfw_insn *
2492 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2493 {
2494         u_char proto = IPPROTO_IP;
2495
2496         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2497                 ; /* do not set O_IP4 nor O_IP6 */
2498         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2499                 /* explicit "just IPv4" rule */
2500                 fill_cmd(cmd, O_IP4, 0, 0);
2501         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2502                 /* explicit "just IPv6" rule */
2503                 proto = IPPROTO_IPV6;
2504                 fill_cmd(cmd, O_IP6, 0, 0);
2505         } else
2506                 return add_proto0(cmd, av, protop);
2507
2508         *protop = proto;
2509         return cmd;
2510 }
2511
2512 static ipfw_insn *
2513 add_srcip(ipfw_insn *cmd, char *av)
2514 {
2515         fill_ip((ipfw_insn_ip *)cmd, av);
2516         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2517                 cmd->opcode = O_IP_SRC_SET;
2518         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2519                 cmd->opcode = O_IP_SRC_LOOKUP;
2520         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2521                 cmd->opcode = O_IP_SRC_ME;
2522         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2523                 cmd->opcode = O_IP_SRC;
2524         else                                                    /* addr/mask */
2525                 cmd->opcode = O_IP_SRC_MASK;
2526         return cmd;
2527 }
2528
2529 static ipfw_insn *
2530 add_dstip(ipfw_insn *cmd, char *av)
2531 {
2532         fill_ip((ipfw_insn_ip *)cmd, av);
2533         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2534                 ;
2535         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2536                 ;
2537         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2538                 cmd->opcode = O_IP_DST_ME;
2539         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2540                 cmd->opcode = O_IP_DST;
2541         else                                                    /* addr/mask */
2542                 cmd->opcode = O_IP_DST_MASK;
2543         return cmd;
2544 }
2545
2546 static ipfw_insn *
2547 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2548 {
2549         /* XXX "any" is trapped before. Perhaps "to" */
2550         if (_substrcmp(av, "any") == 0) {
2551                 return NULL;
2552         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2553                 /* XXX todo: check that we have a protocol with ports */
2554                 cmd->opcode = opcode;
2555                 return cmd;
2556         }
2557         return NULL;
2558 }
2559
2560 static ipfw_insn *
2561 add_src(ipfw_insn *cmd, char *av, u_char proto)
2562 {
2563         struct in6_addr a;
2564         char *host, *ch;
2565         ipfw_insn *ret = NULL;
2566
2567         if ((host = strdup(av)) == NULL)
2568                 return NULL;
2569         if ((ch = strrchr(host, '/')) != NULL)
2570                 *ch = '\0';
2571
2572         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2573             inet_pton(AF_INET6, host, &a) == 1)
2574                 ret = add_srcip6(cmd, av);
2575         /* XXX: should check for IPv4, not !IPv6 */
2576         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2577             inet_pton(AF_INET6, host, &a) != 1))
2578                 ret = add_srcip(cmd, av);
2579         if (ret == NULL && strcmp(av, "any") != 0)
2580                 ret = cmd;
2581
2582         free(host);
2583         return ret;
2584 }
2585
2586 static ipfw_insn *
2587 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2588 {
2589         struct in6_addr a;
2590         char *host, *ch;
2591         ipfw_insn *ret = NULL;
2592
2593         if ((host = strdup(av)) == NULL)
2594                 return NULL;
2595         if ((ch = strrchr(host, '/')) != NULL)
2596                 *ch = '\0';
2597
2598         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2599             inet_pton(AF_INET6, host, &a) == 1)
2600                 ret = add_dstip6(cmd, av);
2601         /* XXX: should check for IPv4, not !IPv6 */
2602         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2603             inet_pton(AF_INET6, host, &a) != 1))
2604                 ret = add_dstip(cmd, av);
2605         if (ret == NULL && strcmp(av, "any") != 0)
2606                 ret = cmd;
2607
2608         free(host);
2609         return ret;
2610 }
2611
2612 /*
2613  * Parse arguments and assemble the microinstructions which make up a rule.
2614  * Rules are added into the 'rulebuf' and then copied in the correct order
2615  * into the actual rule.
2616  *
2617  * The syntax for a rule starts with the action, followed by
2618  * optional action parameters, and the various match patterns.
2619  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2620  * (generated if the rule includes a keep-state option), then the
2621  * various match patterns, log/altq actions, and the actual action.
2622  *
2623  */
2624 void
2625 ipfw_add(char *av[])
2626 {
2627         /*
2628          * rules are added into the 'rulebuf' and then copied in
2629          * the correct order into the actual rule.
2630          * Some things that need to go out of order (prob, action etc.)
2631          * go into actbuf[].
2632          */
2633         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2634
2635         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2636         ipfw_insn *first_cmd;   /* first match pattern */
2637
2638         struct ip_fw *rule;
2639
2640         /*
2641          * various flags used to record that we entered some fields.
2642          */
2643         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2644         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2645         size_t len;
2646
2647         int i;
2648
2649         int open_par = 0;       /* open parenthesis ( */
2650
2651         /* proto is here because it is used to fetch ports */
2652         u_char proto = IPPROTO_IP;      /* default protocol */
2653
2654         double match_prob = 1; /* match probability, default is always match */
2655
2656         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2657         bzero(cmdbuf, sizeof(cmdbuf));
2658         bzero(rulebuf, sizeof(rulebuf));
2659
2660         rule = (struct ip_fw *)rulebuf;
2661         cmd = (ipfw_insn *)cmdbuf;
2662         action = (ipfw_insn *)actbuf;
2663
2664         av++;
2665
2666         /* [rule N]     -- Rule number optional */
2667         if (av[0] && isdigit(**av)) {
2668                 rule->rulenum = atoi(*av);
2669                 av++;
2670         }
2671
2672         /* [set N]      -- set number (0..RESVD_SET), optional */
2673         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2674                 int set = strtoul(av[1], NULL, 10);
2675                 if (set < 0 || set > RESVD_SET)
2676                         errx(EX_DATAERR, "illegal set %s", av[1]);
2677                 rule->set = set;
2678                 av += 2;
2679         }
2680
2681         /* [prob D]     -- match probability, optional */
2682         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2683                 match_prob = strtod(av[1], NULL);
2684
2685                 if (match_prob <= 0 || match_prob > 1)
2686                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2687                 av += 2;
2688         }
2689
2690         /* action       -- mandatory */
2691         NEED1("missing action");
2692         i = match_token(rule_actions, *av);
2693         av++;
2694         action->len = 1;        /* default */
2695         switch(i) {
2696         case TOK_CHECKSTATE:
2697                 have_state = action;
2698                 action->opcode = O_CHECK_STATE;
2699                 break;
2700
2701         case TOK_ACCEPT:
2702                 action->opcode = O_ACCEPT;
2703                 break;
2704
2705         case TOK_DENY:
2706                 action->opcode = O_DENY;
2707                 action->arg1 = 0;
2708                 break;
2709
2710         case TOK_REJECT:
2711                 action->opcode = O_REJECT;
2712                 action->arg1 = ICMP_UNREACH_HOST;
2713                 break;
2714
2715         case TOK_RESET:
2716                 action->opcode = O_REJECT;
2717                 action->arg1 = ICMP_REJECT_RST;
2718                 break;
2719
2720         case TOK_RESET6:
2721                 action->opcode = O_UNREACH6;
2722                 action->arg1 = ICMP6_UNREACH_RST;
2723                 break;
2724
2725         case TOK_UNREACH:
2726                 action->opcode = O_REJECT;
2727                 NEED1("missing reject code");
2728                 fill_reject_code(&action->arg1, *av);
2729                 av++;
2730                 break;
2731
2732         case TOK_UNREACH6:
2733                 action->opcode = O_UNREACH6;
2734                 NEED1("missing unreach code");
2735                 fill_unreach6_code(&action->arg1, *av);
2736                 av++;
2737                 break;
2738
2739         case TOK_COUNT:
2740                 action->opcode = O_COUNT;
2741                 break;
2742
2743         case TOK_NAT:
2744                 action->opcode = O_NAT;
2745                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2746                 if (_substrcmp(*av, "global") == 0) {
2747                         action->arg1 = 0;
2748                         av++;
2749                         break;
2750                 } else
2751                         goto chkarg;
2752
2753         case TOK_QUEUE:
2754                 action->opcode = O_QUEUE;
2755                 goto chkarg;
2756         case TOK_PIPE:
2757                 action->opcode = O_PIPE;
2758                 goto chkarg;
2759         case TOK_SKIPTO:
2760                 action->opcode = O_SKIPTO;
2761                 goto chkarg;
2762         case TOK_NETGRAPH:
2763                 action->opcode = O_NETGRAPH;
2764                 goto chkarg;
2765         case TOK_NGTEE:
2766                 action->opcode = O_NGTEE;
2767                 goto chkarg;
2768         case TOK_DIVERT:
2769                 action->opcode = O_DIVERT;
2770                 goto chkarg;
2771         case TOK_TEE:
2772                 action->opcode = O_TEE;
2773 chkarg:
2774                 if (!av[0])
2775                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2776                 if (isdigit(**av)) {
2777                         action->arg1 = strtoul(*av, NULL, 10);
2778                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2779                                 errx(EX_DATAERR, "illegal argument for %s",
2780                                     *(av - 1));
2781                 } else if (_substrcmp(*av, "tablearg") == 0) {
2782                         action->arg1 = IP_FW_TABLEARG;
2783                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2784                         struct servent *s;
2785                         setservent(1);
2786                         s = getservbyname(av[0], "divert");
2787                         if (s != NULL)
2788                                 action->arg1 = ntohs(s->s_port);
2789                         else
2790                                 errx(EX_DATAERR, "illegal divert/tee port");
2791                 } else
2792                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2793                 av++;
2794                 break;
2795
2796         case TOK_FORWARD: {
2797                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2798                 char *s, *end;
2799
2800                 NEED1("missing forward address[:port]");
2801
2802                 action->opcode = O_FORWARD_IP;
2803                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2804
2805                 /*
2806                  * In the kernel we assume AF_INET and use only
2807                  * sin_port and sin_addr. Remember to set sin_len as
2808                  * the routing code seems to use it too.
2809                  */
2810                 p->sa.sin_family = AF_INET;
2811                 p->sa.sin_len = sizeof(struct sockaddr_in);
2812                 p->sa.sin_port = 0;
2813                 /*
2814                  * locate the address-port separator (':' or ',')
2815                  */
2816                 s = strchr(*av, ':');
2817                 if (s == NULL)
2818                         s = strchr(*av, ',');
2819                 if (s != NULL) {
2820                         *(s++) = '\0';
2821                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2822                         if (s == end)
2823                                 errx(EX_DATAERR,
2824                                     "illegal forwarding port ``%s''", s);
2825                         p->sa.sin_port = (u_short)i;
2826                 }
2827                 if (_substrcmp(*av, "tablearg") == 0)
2828                         p->sa.sin_addr.s_addr = INADDR_ANY;
2829                 else
2830                         lookup_host(*av, &(p->sa.sin_addr));
2831                 av++;
2832                 break;
2833             }
2834         case TOK_COMMENT:
2835                 /* pretend it is a 'count' rule followed by the comment */
2836                 action->opcode = O_COUNT;
2837                 av--;           /* go back... */
2838                 break;
2839
2840         case TOK_SETFIB:
2841             {
2842                 int numfibs;
2843                 size_t intsize = sizeof(int);
2844
2845                 action->opcode = O_SETFIB;
2846                 NEED1("missing fib number");
2847                 if (_substrcmp(*av, "tablearg") == 0) {
2848                         action->arg1 = IP_FW_TABLEARG;
2849                 } else {
2850                         action->arg1 = strtoul(*av, NULL, 10);
2851                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
2852                             NULL, 0) == -1)
2853                                 errx(EX_DATAERR, "fibs not suported.\n");
2854                         if (action->arg1 >= numfibs)  /* Temporary */
2855                                 errx(EX_DATAERR, "fib too large.\n");
2856                 }
2857                 av++;
2858                 break;
2859             }
2860
2861         case TOK_REASS:
2862                 action->opcode = O_REASS;
2863                 break;
2864
2865         default:
2866                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2867         }
2868         action = next_cmd(action);
2869
2870         /*
2871          * [altq queuename] -- altq tag, optional
2872          * [log [logamount N]]  -- log, optional
2873          *
2874          * If they exist, it go first in the cmdbuf, but then it is
2875          * skipped in the copy section to the end of the buffer.
2876          */
2877         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
2878                 av++;
2879                 switch (i) {
2880                 case TOK_LOG:
2881                     {
2882                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2883                         int l;
2884
2885                         if (have_log)
2886                                 errx(EX_DATAERR,
2887                                     "log cannot be specified more than once");
2888                         have_log = (ipfw_insn *)c;
2889                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2890                         cmd->opcode = O_LOG;
2891                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
2892                                 av++;
2893                                 NEED1("logamount requires argument");
2894                                 l = atoi(*av);
2895                                 if (l < 0)
2896                                         errx(EX_DATAERR,
2897                                             "logamount must be positive");
2898                                 c->max_log = l;
2899                                 av++;
2900                         } else {
2901                                 len = sizeof(c->max_log);
2902                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2903                                     &c->max_log, &len, NULL, 0) == -1)
2904                                         errx(1, "sysctlbyname(\"%s\")",
2905                                             "net.inet.ip.fw.verbose_limit");
2906                         }
2907                     }
2908                         break;
2909
2910 #ifndef NO_ALTQ
2911                 case TOK_ALTQ:
2912                     {
2913                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2914
2915                         NEED1("missing altq queue name");
2916                         if (have_altq)
2917                                 errx(EX_DATAERR,
2918                                     "altq cannot be specified more than once");
2919                         have_altq = (ipfw_insn *)a;
2920                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2921                         cmd->opcode = O_ALTQ;
2922                         a->qid = altq_name_to_qid(*av);
2923                         av++;
2924                     }
2925                         break;
2926 #endif
2927
2928                 case TOK_TAG:
2929                 case TOK_UNTAG: {
2930                         uint16_t tag;
2931
2932                         if (have_tag)
2933                                 errx(EX_USAGE, "tag and untag cannot be "
2934                                     "specified more than once");
2935                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
2936                            rule_action_params);
2937                         have_tag = cmd;
2938                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2939                         av++;
2940                         break;
2941                 }
2942
2943                 default:
2944                         abort();
2945                 }
2946                 cmd = next_cmd(cmd);
2947         }
2948
2949         if (have_state) /* must be a check-state, we are done */
2950                 goto done;
2951
2952 #define OR_START(target)                                        \
2953         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
2954                 if (open_par)                                   \
2955                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2956                 prev = NULL;                                    \
2957                 open_par = 1;                                   \
2958                 if ( (av[0])[1] == '\0') {                      \
2959                         av++;                                   \
2960                 } else                                          \
2961                         (*av)++;                                \
2962         }                                                       \
2963         target:                                                 \
2964
2965
2966 #define CLOSE_PAR                                               \
2967         if (open_par) {                                         \
2968                 if (av[0] && (                                  \
2969                     strcmp(*av, ")") == 0 ||                    \
2970                     strcmp(*av, "}") == 0)) {                   \
2971                         prev = NULL;                            \
2972                         open_par = 0;                           \
2973                         av++;                                   \
2974                 } else                                          \
2975                         errx(EX_USAGE, "missing \")\"\n");      \
2976         }
2977
2978 #define NOT_BLOCK                                               \
2979         if (av[0] && _substrcmp(*av, "not") == 0) {             \
2980                 if (cmd->len & F_NOT)                           \
2981                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2982                 cmd->len |= F_NOT;                              \
2983                 av++;                                           \
2984         }
2985
2986 #define OR_BLOCK(target)                                        \
2987         if (av[0] && _substrcmp(*av, "or") == 0) {              \
2988                 if (prev == NULL || open_par == 0)              \
2989                         errx(EX_DATAERR, "invalid OR block");   \
2990                 prev->len |= F_OR;                              \
2991                 av++;                                   \
2992                 goto target;                                    \
2993         }                                                       \
2994         CLOSE_PAR;
2995
2996         first_cmd = cmd;
2997
2998 #if 0
2999         /*
3000          * MAC addresses, optional.
3001          * If we have this, we skip the part "proto from src to dst"
3002          * and jump straight to the option parsing.
3003          */
3004         NOT_BLOCK;
3005         NEED1("missing protocol");
3006         if (_substrcmp(*av, "MAC") == 0 ||
3007             _substrcmp(*av, "mac") == 0) {
3008                 av++;                   /* the "MAC" keyword */
3009                 add_mac(cmd, av);       /* exits in case of errors */
3010                 cmd = next_cmd(cmd);
3011                 av += 2;                /* dst-mac and src-mac */
3012                 NOT_BLOCK;
3013                 NEED1("missing mac type");
3014                 if (add_mactype(cmd, av[0]))
3015                         cmd = next_cmd(cmd);
3016                 av++;                   /* any or mac-type */
3017                 goto read_options;
3018         }
3019 #endif
3020
3021         /*
3022          * protocol, mandatory
3023          */
3024     OR_START(get_proto);
3025         NOT_BLOCK;
3026         NEED1("missing protocol");
3027         if (add_proto_compat(cmd, *av, &proto)) {
3028                 av++;
3029                 if (F_LEN(cmd) != 0) {
3030                         prev = cmd;
3031                         cmd = next_cmd(cmd);
3032                 }
3033         } else if (first_cmd != cmd) {
3034                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3035         } else
3036                 goto read_options;
3037     OR_BLOCK(get_proto);
3038
3039         /*
3040          * "from", mandatory
3041          */
3042         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3043                 errx(EX_USAGE, "missing ``from''");
3044         av++;
3045
3046         /*
3047          * source IP, mandatory
3048          */
3049     OR_START(source_ip);
3050         NOT_BLOCK;      /* optional "not" */
3051         NEED1("missing source address");
3052         if (add_src(cmd, *av, proto)) {
3053                 av++;
3054                 if (F_LEN(cmd) != 0) {  /* ! any */
3055                         prev = cmd;
3056                         cmd = next_cmd(cmd);
3057                 }
3058         } else
3059                 errx(EX_USAGE, "bad source address %s", *av);
3060     OR_BLOCK(source_ip);
3061
3062         /*
3063          * source ports, optional
3064          */
3065         NOT_BLOCK;      /* optional "not" */
3066         if ( av[0] != NULL ) {
3067                 if (_substrcmp(*av, "any") == 0 ||
3068                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3069                         av++;
3070                         if (F_LEN(cmd) != 0)
3071                                 cmd = next_cmd(cmd);
3072                 }
3073         }
3074
3075         /*
3076          * "to", mandatory
3077          */
3078         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3079                 errx(EX_USAGE, "missing ``to''");
3080         av++;
3081
3082         /*
3083          * destination, mandatory
3084          */
3085     OR_START(dest_ip);
3086         NOT_BLOCK;      /* optional "not" */
3087         NEED1("missing dst address");
3088         if (add_dst(cmd, *av, proto)) {
3089                 av++;
3090                 if (F_LEN(cmd) != 0) {  /* ! any */
3091                         prev = cmd;
3092                         cmd = next_cmd(cmd);
3093                 }
3094         } else
3095                 errx( EX_USAGE, "bad destination address %s", *av);
3096     OR_BLOCK(dest_ip);
3097
3098         /*
3099          * dest. ports, optional
3100          */
3101         NOT_BLOCK;      /* optional "not" */
3102         if (av[0]) {
3103                 if (_substrcmp(*av, "any") == 0 ||
3104                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3105                         av++;
3106                         if (F_LEN(cmd) != 0)
3107                                 cmd = next_cmd(cmd);
3108                 }
3109         }
3110
3111 read_options:
3112         if (av[0] && first_cmd == cmd) {
3113                 /*
3114                  * nothing specified so far, store in the rule to ease
3115                  * printout later.
3116                  */
3117                  rule->_pad = 1;
3118         }
3119         prev = NULL;
3120         while ( av[0] != NULL ) {
3121                 char *s;
3122                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3123
3124                 s = *av;
3125                 cmd32 = (ipfw_insn_u32 *)cmd;
3126
3127                 if (*s == '!') {        /* alternate syntax for NOT */
3128                         if (cmd->len & F_NOT)
3129                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3130                         cmd->len = F_NOT;
3131                         s++;
3132                 }
3133                 i = match_token(rule_options, s);
3134                 av++;
3135                 switch(i) {
3136                 case TOK_NOT:
3137                         if (cmd->len & F_NOT)
3138                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3139                         cmd->len = F_NOT;
3140                         break;
3141
3142                 case TOK_OR:
3143                         if (open_par == 0 || prev == NULL)
3144                                 errx(EX_USAGE, "invalid \"or\" block\n");
3145                         prev->len |= F_OR;
3146                         break;
3147
3148                 case TOK_STARTBRACE:
3149                         if (open_par)
3150                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3151                         open_par = 1;
3152                         break;
3153
3154                 case TOK_ENDBRACE:
3155                         if (!open_par)
3156                                 errx(EX_USAGE, "+missing \")\"\n");
3157                         open_par = 0;
3158                         prev = NULL;
3159                         break;
3160
3161                 case TOK_IN:
3162                         fill_cmd(cmd, O_IN, 0, 0);
3163                         break;
3164
3165                 case TOK_OUT:
3166                         cmd->len ^= F_NOT; /* toggle F_NOT */
3167                         fill_cmd(cmd, O_IN, 0, 0);
3168                         break;
3169
3170                 case TOK_DIVERTED:
3171                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3172                         break;
3173
3174                 case TOK_DIVERTEDLOOPBACK:
3175                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3176                         break;
3177
3178                 case TOK_DIVERTEDOUTPUT:
3179                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3180                         break;
3181
3182                 case TOK_FRAG:
3183                         fill_cmd(cmd, O_FRAG, 0, 0);
3184                         break;
3185
3186                 case TOK_LAYER2:
3187                         fill_cmd(cmd, O_LAYER2, 0, 0);
3188                         break;
3189
3190                 case TOK_XMIT:
3191                 case TOK_RECV:
3192                 case TOK_VIA:
3193                         NEED1("recv, xmit, via require interface name"
3194                                 " or address");
3195                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3196                         av++;
3197                         if (F_LEN(cmd) == 0)    /* not a valid address */
3198                                 break;
3199                         if (i == TOK_XMIT)
3200                                 cmd->opcode = O_XMIT;
3201                         else if (i == TOK_RECV)
3202                                 cmd->opcode = O_RECV;
3203                         else if (i == TOK_VIA)
3204                                 cmd->opcode = O_VIA;
3205                         break;
3206
3207                 case TOK_ICMPTYPES:
3208                         NEED1("icmptypes requires list of types");
3209                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3210                         av++;
3211                         break;
3212
3213                 case TOK_ICMP6TYPES:
3214                         NEED1("icmptypes requires list of types");
3215                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3216                         av++;
3217                         break;
3218
3219                 case TOK_IPTTL:
3220                         NEED1("ipttl requires TTL");
3221                         if (strpbrk(*av, "-,")) {
3222                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3223                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3224                         } else
3225                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3226                         av++;
3227                         break;
3228
3229                 case TOK_IPID:
3230                         NEED1("ipid requires id");
3231                         if (strpbrk(*av, "-,")) {
3232                             if (!add_ports(cmd, *av, 0, O_IPID))
3233                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3234                         } else
3235                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3236                         av++;
3237                         break;
3238
3239                 case TOK_IPLEN:
3240                         NEED1("iplen requires length");
3241                         if (strpbrk(*av, "-,")) {
3242                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3243                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3244                         } else
3245                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3246                         av++;
3247                         break;
3248
3249                 case TOK_IPVER:
3250                         NEED1("ipver requires version");
3251                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3252                         av++;
3253                         break;
3254
3255                 case TOK_IPPRECEDENCE:
3256                         NEED1("ipprecedence requires value");
3257                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3258                             (strtoul(*av, NULL, 0) & 7) << 5);
3259                         av++;
3260                         break;
3261
3262                 case TOK_IPOPTS:
3263                         NEED1("missing argument for ipoptions");
3264                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3265                         av++;
3266                         break;
3267
3268                 case TOK_IPTOS:
3269                         NEED1("missing argument for iptos");
3270                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3271                         av++;
3272                         break;
3273
3274                 case TOK_UID:
3275                         NEED1("uid requires argument");
3276                     {
3277                         char *end;
3278                         uid_t uid;
3279                         struct passwd *pwd;
3280
3281                         cmd->opcode = O_UID;
3282                         uid = strtoul(*av, &end, 0);
3283                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3284                         if (pwd == NULL)
3285                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3286                         cmd32->d[0] = pwd->pw_uid;
3287                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3288                         av++;
3289                     }
3290                         break;
3291
3292                 case TOK_GID:
3293                         NEED1("gid requires argument");
3294                     {
3295                         char *end;
3296                         gid_t gid;
3297                         struct group *grp;
3298
3299                         cmd->opcode = O_GID;
3300                         gid = strtoul(*av, &end, 0);
3301                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3302                         if (grp == NULL)
3303                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3304                         cmd32->d[0] = grp->gr_gid;
3305                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3306                         av++;
3307                     }
3308                         break;
3309
3310                 case TOK_JAIL:
3311                         NEED1("jail requires argument");
3312                     {
3313                         char *end;
3314                         int jid;
3315
3316                         cmd->opcode = O_JAIL;
3317                         jid = (int)strtol(*av, &end, 0);
3318                         if (jid < 0 || *end != '\0')
3319                                 errx(EX_DATAERR, "jail requires prison ID");
3320                         cmd32->d[0] = (uint32_t)jid;
3321                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3322                         av++;
3323                     }
3324                         break;
3325
3326                 case TOK_ESTAB:
3327                         fill_cmd(cmd, O_ESTAB, 0, 0);
3328                         break;
3329
3330                 case TOK_SETUP:
3331                         fill_cmd(cmd, O_TCPFLAGS, 0,
3332                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3333                         break;
3334
3335                 case TOK_TCPDATALEN:
3336                         NEED1("tcpdatalen requires length");
3337                         if (strpbrk(*av, "-,")) {
3338                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3339                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3340                         } else
3341                             fill_cmd(cmd, O_TCPDATALEN, 0,
3342                                     strtoul(*av, NULL, 0));
3343                         av++;
3344                         break;
3345
3346                 case TOK_TCPOPTS:
3347                         NEED1("missing argument for tcpoptions");
3348                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3349                         av++;
3350                         break;
3351
3352                 case TOK_TCPSEQ:
3353                 case TOK_TCPACK:
3354                         NEED1("tcpseq/tcpack requires argument");
3355                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3356                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3357                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3358                         av++;
3359                         break;
3360
3361                 case TOK_TCPWIN:
3362                         NEED1("tcpwin requires length");
3363                         fill_cmd(cmd, O_TCPWIN, 0,
3364                             htons(strtoul(*av, NULL, 0)));
3365                         av++;
3366                         break;
3367
3368                 case TOK_TCPFLAGS:
3369                         NEED1("missing argument for tcpflags");
3370                         cmd->opcode = O_TCPFLAGS;
3371                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3372                         av++;
3373                         break;
3374
3375                 case TOK_KEEPSTATE:
3376                         if (open_par)
3377                                 errx(EX_USAGE, "keep-state cannot be part "
3378                                     "of an or block");
3379                         if (have_state)
3380                                 errx(EX_USAGE, "only one of keep-state "
3381                                         "and limit is allowed");
3382                         have_state = cmd;
3383                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3384                         break;
3385
3386                 case TOK_LIMIT: {
3387                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3388                         int val;
3389
3390                         if (open_par)
3391                                 errx(EX_USAGE,
3392                                     "limit cannot be part of an or block");
3393                         if (have_state)
3394                                 errx(EX_USAGE, "only one of keep-state and "
3395                                     "limit is allowed");
3396                         have_state = cmd;
3397
3398                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3399                         cmd->opcode = O_LIMIT;
3400                         c->limit_mask = c->conn_limit = 0;
3401
3402                         while ( av[0] != NULL ) {
3403                                 if ((val = match_token(limit_masks, *av)) <= 0)
3404                                         break;
3405                                 c->limit_mask |= val;
3406                                 av++;
3407                         }
3408
3409                         if (c->limit_mask == 0)
3410                                 errx(EX_USAGE, "limit: missing limit mask");
3411
3412                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3413                             TOK_LIMIT, rule_options);
3414
3415                         av++;
3416                         break;
3417                 }
3418
3419                 case TOK_PROTO:
3420                         NEED1("missing protocol");
3421                         if (add_proto(cmd, *av, &proto)) {
3422                                 av++;
3423                         } else
3424                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3425                                     *av);
3426                         break;
3427
3428                 case TOK_SRCIP:
3429                         NEED1("missing source IP");
3430                         if (add_srcip(cmd, *av)) {
3431                                 av++;
3432                         }
3433                         break;
3434
3435                 case TOK_DSTIP:
3436                         NEED1("missing destination IP");
3437                         if (add_dstip(cmd, *av)) {
3438                                 av++;
3439                         }
3440                         break;
3441
3442                 case TOK_SRCIP6:
3443                         NEED1("missing source IP6");
3444                         if (add_srcip6(cmd, *av)) {
3445                                 av++;
3446                         }
3447                         break;
3448
3449                 case TOK_DSTIP6:
3450                         NEED1("missing destination IP6");
3451                         if (add_dstip6(cmd, *av)) {
3452                                 av++;
3453                         }
3454                         break;
3455
3456                 case TOK_SRCPORT:
3457                         NEED1("missing source port");
3458                         if (_substrcmp(*av, "any") == 0 ||
3459                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3460                                 av++;
3461                         } else
3462                                 errx(EX_DATAERR, "invalid source port %s", *av);
3463                         break;
3464
3465                 case TOK_DSTPORT:
3466                         NEED1("missing destination port");
3467                         if (_substrcmp(*av, "any") == 0 ||
3468                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3469                                 av++;
3470                         } else
3471                                 errx(EX_DATAERR, "invalid destination port %s",
3472                                     *av);
3473                         break;
3474
3475                 case TOK_MAC:
3476                         if (add_mac(cmd, av))
3477                                 av += 2;
3478                         break;
3479
3480                 case TOK_MACTYPE:
3481                         NEED1("missing mac type");
3482                         if (!add_mactype(cmd, *av))
3483                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3484                         av++;
3485                         break;
3486
3487                 case TOK_VERREVPATH:
3488                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3489                         break;
3490
3491                 case TOK_VERSRCREACH:
3492                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3493                         break;
3494
3495                 case TOK_ANTISPOOF:
3496                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3497                         break;
3498
3499                 case TOK_IPSEC:
3500                         fill_cmd(cmd, O_IPSEC, 0, 0);
3501                         break;
3502
3503                 case TOK_IPV6:
3504                         fill_cmd(cmd, O_IP6, 0, 0);
3505                         break;
3506
3507                 case TOK_IPV4:
3508                         fill_cmd(cmd, O_IP4, 0, 0);
3509                         break;
3510
3511                 case TOK_EXT6HDR:
3512                         fill_ext6hdr( cmd, *av );
3513                         av++;
3514                         break;
3515
3516                 case TOK_FLOWID:
3517                         if (proto != IPPROTO_IPV6 )
3518                                 errx( EX_USAGE, "flow-id filter is active "
3519                                     "only for ipv6 protocol\n");
3520                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3521                         av++;
3522                         break;
3523
3524                 case TOK_COMMENT:
3525                         fill_comment(cmd, av);
3526                         av[0]=NULL;
3527                         break;
3528
3529                 case TOK_TAGGED:
3530                         if (av[0] && strpbrk(*av, "-,")) {
3531                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3532                                         errx(EX_DATAERR, "tagged: invalid tag"
3533                                             " list: %s", *av);
3534                         }
3535                         else {
3536                                 uint16_t tag;
3537
3538                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3539                                     TOK_TAGGED, rule_options);
3540                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3541                         }
3542                         av++;
3543                         break;
3544
3545                 case TOK_FIB:
3546                         NEED1("fib requires fib number");
3547                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3548                         av++;
3549                         break;
3550                 case TOK_SOCKARG:
3551                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3552                         break;
3553
3554                 case TOK_LOOKUP: {
3555                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3556                         char *p;
3557                         int j;
3558
3559                         if (!av[0] || !av[1])
3560                                 errx(EX_USAGE, "format: lookup argument tablenum");
3561                         cmd->opcode = O_IP_DST_LOOKUP;
3562                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3563                         i = match_token(rule_options, *av);
3564                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3565                                 if (i == lookup_key[j])
3566                                         break;
3567                         }
3568                         if (lookup_key[j] <= 0)
3569                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3570                         c->d[1] = j; // i converted to option
3571                         av++;
3572                         cmd->arg1 = strtoul(*av, &p, 0);
3573                         if (p && *p)
3574                                 errx(EX_USAGE, "format: lookup argument tablenum");
3575                         av++;
3576                     }
3577                         break;
3578
3579                 default:
3580                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3581                 }
3582                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3583                         prev = cmd;
3584                         cmd = next_cmd(cmd);
3585                 }
3586         }
3587
3588 done:
3589         /*
3590          * Now copy stuff into the rule.
3591          * If we have a keep-state option, the first instruction
3592          * must be a PROBE_STATE (which is generated here).
3593          * If we have a LOG option, it was stored as the first command,
3594          * and now must be moved to the top of the action part.
3595          */
3596         dst = (ipfw_insn *)rule->cmd;
3597
3598         /*
3599          * First thing to write into the command stream is the match probability.
3600          */
3601         if (match_prob != 1) { /* 1 means always match */
3602                 dst->opcode = O_PROB;
3603                 dst->len = 2;
3604                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3605                 dst += dst->len;
3606         }
3607
3608         /*
3609          * generate O_PROBE_STATE if necessary
3610          */
3611         if (have_state && have_state->opcode != O_CHECK_STATE) {
3612                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3613                 dst = next_cmd(dst);
3614         }
3615
3616         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3617         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3618                 i = F_LEN(src);
3619
3620                 switch (src->opcode) {
3621                 case O_LOG:
3622                 case O_KEEP_STATE:
3623                 case O_LIMIT:
3624                 case O_ALTQ:
3625                 case O_TAG:
3626                         break;
3627                 default:
3628                         bcopy(src, dst, i * sizeof(uint32_t));
3629                         dst += i;
3630                 }
3631         }
3632
3633         /*
3634          * put back the have_state command as last opcode
3635          */
3636         if (have_state && have_state->opcode != O_CHECK_STATE) {
3637                 i = F_LEN(have_state);
3638                 bcopy(have_state, dst, i * sizeof(uint32_t));
3639                 dst += i;
3640         }
3641         /*
3642          * start action section
3643          */
3644         rule->act_ofs = dst - rule->cmd;
3645
3646         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3647         if (have_log) {
3648                 i = F_LEN(have_log);
3649                 bcopy(have_log, dst, i * sizeof(uint32_t));
3650                 dst += i;
3651         }
3652         if (have_altq) {
3653                 i = F_LEN(have_altq);
3654                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3655                 dst += i;
3656         }
3657         if (have_tag) {
3658                 i = F_LEN(have_tag);
3659                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3660                 dst += i;
3661         }
3662         /*
3663          * copy all other actions
3664          */
3665         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3666                 i = F_LEN(src);
3667                 bcopy(src, dst, i * sizeof(uint32_t));
3668                 dst += i;
3669         }
3670
3671         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3672         i = (char *)dst - (char *)rule;
3673         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3674                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3675         if (!co.do_quiet)
3676                 show_ipfw(rule, 0, 0);
3677 }
3678
3679 /*
3680  * clear the counters or the log counters.
3681  */
3682 void
3683 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3684 {
3685         uint32_t arg, saved_arg;
3686         int failed = EX_OK;
3687         char const *errstr;
3688         char const *name = optname ? "RESETLOG" : "ZERO";
3689
3690         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3691
3692         av++; ac--;
3693
3694         if (!ac) {
3695                 /* clear all entries */
3696                 if (do_cmd(optname, NULL, 0) < 0)
3697                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3698                 if (!co.do_quiet)
3699                         printf("%s.\n", optname == IP_FW_ZERO ?
3700                             "Accounting cleared":"Logging counts reset");
3701
3702                 return;
3703         }
3704
3705         while (ac) {
3706                 /* Rule number */
3707                 if (isdigit(**av)) {
3708                         arg = strtonum(*av, 0, 0xffff, &errstr);
3709                         if (errstr)
3710                                 errx(EX_DATAERR,
3711                                     "invalid rule number %s\n", *av);
3712                         saved_arg = arg;
3713                         if (co.use_set)
3714                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3715                         av++;
3716                         ac--;
3717                         if (do_cmd(optname, &arg, sizeof(arg))) {
3718                                 warn("rule %u: setsockopt(IP_FW_%s)",
3719                                     saved_arg, name);
3720                                 failed = EX_UNAVAILABLE;
3721                         } else if (!co.do_quiet)
3722                                 printf("Entry %d %s.\n", saved_arg,
3723                                     optname == IP_FW_ZERO ?
3724                                         "cleared" : "logging count reset");
3725                 } else {
3726                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3727                 }
3728         }
3729         if (failed != EX_OK)
3730                 exit(failed);
3731 }
3732
3733 void
3734 ipfw_flush(int force)
3735 {
3736         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3737
3738         if (!force && !co.do_quiet) { /* need to ask user */
3739                 int c;
3740
3741                 printf("Are you sure? [yn] ");
3742                 fflush(stdout);
3743                 do {
3744                         c = toupper(getc(stdin));
3745                         while (c != '\n' && getc(stdin) != '\n')
3746                                 if (feof(stdin))
3747                                         return; /* and do not flush */
3748                 } while (c != 'Y' && c != 'N');
3749                 printf("\n");
3750                 if (c == 'N')   /* user said no */
3751                         return;
3752         }
3753         if (co.do_pipe) {
3754                 dummynet_flush();
3755                 return;
3756         }
3757         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3758         if (co.use_set) {
3759                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3760                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3761                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3762         } else if (do_cmd(cmd, NULL, 0) < 0)
3763                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3764                     co.do_pipe ? "DUMMYNET" : "FW");
3765         if (!co.do_quiet)
3766                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3767 }
3768
3769
3770 static void table_list(ipfw_table_entry ent, int need_header);
3771
3772 /*
3773  * This one handles all table-related commands
3774  *      ipfw table N add addr[/masklen] [value]
3775  *      ipfw table N delete addr[/masklen]
3776  *      ipfw table {N | all} flush
3777  *      ipfw table {N | all} list
3778  */
3779 void
3780 ipfw_table_handler(int ac, char *av[])
3781 {
3782         ipfw_table_entry ent;
3783         int do_add;
3784         int is_all;
3785         size_t len;
3786         char *p;
3787         uint32_t a;
3788         uint32_t tables_max;
3789
3790         len = sizeof(tables_max);
3791         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3792                 NULL, 0) == -1) {
3793 #ifdef IPFW_TABLES_MAX
3794                 warn("Warn: Failed to get the max tables number via sysctl. "
3795                      "Using the compiled in defaults. \nThe reason was");
3796                 tables_max = IPFW_TABLES_MAX;
3797 #else
3798                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3799 #endif
3800         }
3801
3802         ac--; av++;
3803         if (ac && isdigit(**av)) {
3804                 ent.tbl = atoi(*av);
3805                 is_all = 0;
3806                 ac--; av++;
3807         } else if (ac && _substrcmp(*av, "all") == 0) {
3808                 ent.tbl = 0;
3809                 is_all = 1;
3810                 ac--; av++;
3811         } else
3812                 errx(EX_USAGE, "table number or 'all' keyword required");
3813         if (ent.tbl >= tables_max)
3814                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3815                         "value (%d)", tables_max - 1);
3816         NEED1("table needs command");
3817         if (is_all && _substrcmp(*av, "list") != 0
3818                    && _substrcmp(*av, "flush") != 0)
3819                 errx(EX_USAGE, "table number required");
3820
3821         if (_substrcmp(*av, "add") == 0 ||
3822             _substrcmp(*av, "delete") == 0) {
3823                 do_add = **av == 'a';
3824                 ac--; av++;
3825                 if (!ac)
3826                         errx(EX_USAGE, "IP address required");
3827                 p = strchr(*av, '/');
3828                 if (p) {
3829                         *p++ = '\0';
3830                         ent.masklen = atoi(p);
3831                         if (ent.masklen > 32)
3832                                 errx(EX_DATAERR, "bad width ``%s''", p);
3833                 } else
3834                         ent.masklen = 32;
3835                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3836                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3837                 ac--; av++;
3838                 if (do_add && ac) {
3839                         unsigned int tval;
3840                         /* isdigit is a bit of a hack here.. */
3841                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3842                                 ent.value = strtoul(*av, NULL, 0);
3843                         } else {
3844                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3845                                         /* The value must be stored in host order        *
3846                                          * so that the values < 65k can be distinguished */
3847                                         ent.value = ntohl(tval);
3848                                 } else {
3849                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3850                                 }
3851                         }
3852                 } else
3853                         ent.value = 0;
3854                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3855                     &ent, sizeof(ent)) < 0) {
3856                         /* If running silent, don't bomb out on these errors. */
3857                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3858                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3859                                     do_add ? "ADD" : "DEL");
3860                         /* In silent mode, react to a failed add by deleting */
3861                         if (do_add) {
3862                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3863                                 if (do_cmd(IP_FW_TABLE_ADD,
3864                                     &ent, sizeof(ent)) < 0)
3865                                         err(EX_OSERR,
3866                                             "setsockopt(IP_FW_TABLE_ADD)");
3867                         }
3868                 }
3869         } else if (_substrcmp(*av, "flush") == 0) {
3870                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3871                 do {
3872                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3873                             sizeof(ent.tbl)) < 0)
3874                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3875                 } while (++ent.tbl < a);
3876         } else if (_substrcmp(*av, "list") == 0) {
3877                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3878                 do {
3879                         table_list(ent, is_all);
3880                 } while (++ent.tbl < a);
3881         } else
3882                 errx(EX_USAGE, "invalid table command %s", *av);
3883 }
3884
3885 static void
3886 table_list(ipfw_table_entry ent, int need_header)
3887 {
3888         ipfw_table *tbl;
3889         socklen_t l;
3890         uint32_t a;
3891
3892         a = ent.tbl;
3893         l = sizeof(a);
3894         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3895                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3896
3897         /* If a is zero we have nothing to do, the table is empty. */
3898         if (a == 0)
3899                 return;
3900
3901         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3902         tbl = safe_calloc(1, l);
3903         tbl->tbl = ent.tbl;
3904         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3905                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3906         if (tbl->cnt && need_header)
3907                 printf("---table(%d)---\n", tbl->tbl);
3908         for (a = 0; a < tbl->cnt; a++) {
3909                 unsigned int tval;
3910                 tval = tbl->ent[a].value;
3911                 if (co.do_value_as_ip) {
3912                         char tbuf[128];
3913                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3914                                 &tbl->ent[a].addr), 127);
3915                         /* inet_ntoa expects network order */
3916                         tval = htonl(tval);
3917                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3918                                 inet_ntoa(*(struct in_addr *)&tval));
3919                 } else {
3920                         printf("%s/%u %u\n",
3921                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3922                                 tbl->ent[a].masklen, tval);
3923                 }
3924         }
3925         free(tbl);
3926 }