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/param.h>
  25 #include <sys/socket.h>
  26 #include <sys/sockio.h>
  27 #include <sys/sysctl.h>
  28
  29 #include "ipfw2.h"
  30
  31 #include <ctype.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <grp.h>
  35 #include <netdb.h>
  36 #include <pwd.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <sysexits.h>
  41 #include <time.h>       /* ctime */
  42 #include <timeconv.h>   /* _long_to_time */
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45
  46 #include <net/ethernet.h>
  47 #include <net/if.h>             /* only IFNAMSIZ */
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>   /* only n_short, n_long */
  50 #include <netinet/ip.h>
  51 #include <netinet/ip_icmp.h>
  52 #include <netinet/ip_fw.h>
  53 #include <netinet/tcp.h>
  54 #include <arpa/inet.h>
  55
  56 struct cmdline_opts co; /* global options */
  57
  58 int resvd_set_number = RESVD_SET;
  59
  60 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  61         if (!av[0])                                                     \
  62                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  63         if (_substrcmp(*av, "tablearg") == 0) {                         \
  64                 arg = IP_FW_TABLEARG;                                   \
  65                 break;                                                  \
  66         }                                                               \
  67                                                                         \
  68         {                                                               \
  69         long _xval;                                                     \
  70         char *end;                                                      \
  71                                                                         \
  72         _xval = strtol(*av, &end, 10);                                  \
  73                                                                         \
  74         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  75                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  76                     match_value(s_x, tok), *av);                        \
  77                                                                         \
  78         if (errno == ERANGE || _xval < min || _xval > max)              \
  79                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  80                     match_value(s_x, tok), min, max, *av);              \
  81                                                                         \
  82         if (_xval == IP_FW_TABLEARG)                                    \
  83                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  84                     match_value(s_x, tok), *av);                        \
  85         arg = _xval;                                                    \
  86         }                                                               \
  87 } while (0)
  88
  89 static void
  90 PRINT_UINT_ARG(const char *str, uint32_t arg)
  91 {
  92         if (str != NULL)
  93                 printf("%s",str);
  94         if (arg == IP_FW_TABLEARG)
  95                 printf("tablearg");
  96         else
  97                 printf("%u", arg);
  98 }
  99
 100 static struct _s_x f_tcpflags[] = {
 101         { "syn", TH_SYN },
 102         { "fin", TH_FIN },
 103         { "ack", TH_ACK },
 104         { "psh", TH_PUSH },
 105         { "rst", TH_RST },
 106         { "urg", TH_URG },
 107         { "tcp flag", 0 },
 108         { NULL, 0 }
 109 };
 110
 111 static struct _s_x f_tcpopts[] = {
 112         { "mss",        IP_FW_TCPOPT_MSS },
 113         { "maxseg",     IP_FW_TCPOPT_MSS },
 114         { "window",     IP_FW_TCPOPT_WINDOW },
 115         { "sack",       IP_FW_TCPOPT_SACK },
 116         { "ts",         IP_FW_TCPOPT_TS },
 117         { "timestamp",  IP_FW_TCPOPT_TS },
 118         { "cc",         IP_FW_TCPOPT_CC },
 119         { "tcp option", 0 },
 120         { NULL, 0 }
 121 };
 122
 123 /*
 124  * IP options span the range 0 to 255 so we need to remap them
 125  * (though in fact only the low 5 bits are significant).
 126  */
 127 static struct _s_x f_ipopts[] = {
 128         { "ssrr",       IP_FW_IPOPT_SSRR},
 129         { "lsrr",       IP_FW_IPOPT_LSRR},
 130         { "rr",         IP_FW_IPOPT_RR},
 131         { "ts",         IP_FW_IPOPT_TS},
 132         { "ip option",  0 },
 133         { NULL, 0 }
 134 };
 135
 136 static struct _s_x f_iptos[] = {
 137         { "lowdelay",   IPTOS_LOWDELAY},
 138         { "throughput", IPTOS_THROUGHPUT},
 139         { "reliability", IPTOS_RELIABILITY},
 140         { "mincost",    IPTOS_MINCOST},
 141         { "congestion", IPTOS_ECN_CE},
 142         { "ecntransport", IPTOS_ECN_ECT0},
 143         { "ip tos option", 0},
 144         { NULL, 0 }
 145 };
 146
 147 static struct _s_x limit_masks[] = {
 148         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 149         {"src-addr",    DYN_SRC_ADDR},
 150         {"src-port",    DYN_SRC_PORT},
 151         {"dst-addr",    DYN_DST_ADDR},
 152         {"dst-port",    DYN_DST_PORT},
 153         {NULL,          0}
 154 };
 155
 156 /*
 157  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 158  * This is only used in this code.
 159  */
 160 #define IPPROTO_ETHERTYPE       0x1000
 161 static struct _s_x ether_types[] = {
 162     /*
 163      * Note, we cannot use "-:&/" in the names because they are field
 164      * separators in the type specifications. Also, we use s = NULL as
 165      * end-delimiter, because a type of 0 can be legal.
 166      */
 167         { "ip",         0x0800 },
 168         { "ipv4",       0x0800 },
 169         { "ipv6",       0x86dd },
 170         { "arp",        0x0806 },
 171         { "rarp",       0x8035 },
 172         { "vlan",       0x8100 },
 173         { "loop",       0x9000 },
 174         { "trail",      0x1000 },
 175         { "at",         0x809b },
 176         { "atalk",      0x809b },
 177         { "aarp",       0x80f3 },
 178         { "pppoe_disc", 0x8863 },
 179         { "pppoe_sess", 0x8864 },
 180         { "ipx_8022",   0x00E0 },
 181         { "ipx_8023",   0x0000 },
 182         { "ipx_ii",     0x8137 },
 183         { "ipx_snap",   0x8137 },
 184         { "ipx",        0x8137 },
 185         { "ns",         0x0600 },
 186         { NULL,         0 }
 187 };
 188
 189
 190 static struct _s_x rule_actions[] = {
 191         { "accept",             TOK_ACCEPT },
 192         { "pass",               TOK_ACCEPT },
 193         { "allow",              TOK_ACCEPT },
 194         { "permit",             TOK_ACCEPT },
 195         { "count",              TOK_COUNT },
 196         { "pipe",               TOK_PIPE },
 197         { "queue",              TOK_QUEUE },
 198         { "divert",             TOK_DIVERT },
 199         { "tee",                TOK_TEE },
 200         { "netgraph",           TOK_NETGRAPH },
 201         { "ngtee",              TOK_NGTEE },
 202         { "fwd",                TOK_FORWARD },
 203         { "forward",            TOK_FORWARD },
 204         { "skipto",             TOK_SKIPTO },
 205         { "deny",               TOK_DENY },
 206         { "drop",               TOK_DENY },
 207         { "reject",             TOK_REJECT },
 208         { "reset6",             TOK_RESET6 },
 209         { "reset",              TOK_RESET },
 210         { "unreach6",           TOK_UNREACH6 },
 211         { "unreach",            TOK_UNREACH },
 212         { "check-state",        TOK_CHECKSTATE },
 213         { "//",                 TOK_COMMENT },
 214         { "nat",                TOK_NAT },
 215         { "reass",              TOK_REASS },
 216         { "setfib",             TOK_SETFIB },
 217         { "call",               TOK_CALL },
 218         { "return",             TOK_RETURN },
 219         { NULL, 0 }     /* terminator */
 220 };
 221
 222 static struct _s_x rule_action_params[] = {
 223         { "altq",               TOK_ALTQ },
 224         { "log",                TOK_LOG },
 225         { "tag",                TOK_TAG },
 226         { "untag",              TOK_UNTAG },
 227         { NULL, 0 }     /* terminator */
 228 };
 229
 230 /*
 231  * The 'lookup' instruction accepts one of the following arguments.
 232  * -1 is a terminator for the list.
 233  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 234  */
 235 static int lookup_key[] = {
 236         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 237         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 238
 239 static struct _s_x rule_options[] = {
 240         { "tagged",             TOK_TAGGED },
 241         { "uid",                TOK_UID },
 242         { "gid",                TOK_GID },
 243         { "jail",               TOK_JAIL },
 244         { "in",                 TOK_IN },
 245         { "limit",              TOK_LIMIT },
 246         { "keep-state",         TOK_KEEPSTATE },
 247         { "bridged",            TOK_LAYER2 },
 248         { "layer2",             TOK_LAYER2 },
 249         { "out",                TOK_OUT },
 250         { "diverted",           TOK_DIVERTED },
 251         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 252         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 253         { "xmit",               TOK_XMIT },
 254         { "recv",               TOK_RECV },
 255         { "via",                TOK_VIA },
 256         { "fragment",           TOK_FRAG },
 257         { "frag",               TOK_FRAG },
 258         { "fib",                TOK_FIB },
 259         { "ipoptions",          TOK_IPOPTS },
 260         { "ipopts",             TOK_IPOPTS },
 261         { "iplen",              TOK_IPLEN },
 262         { "ipid",               TOK_IPID },
 263         { "ipprecedence",       TOK_IPPRECEDENCE },
 264         { "dscp",               TOK_DSCP },
 265         { "iptos",              TOK_IPTOS },
 266         { "ipttl",              TOK_IPTTL },
 267         { "ipversion",          TOK_IPVER },
 268         { "ipver",              TOK_IPVER },
 269         { "estab",              TOK_ESTAB },
 270         { "established",        TOK_ESTAB },
 271         { "setup",              TOK_SETUP },
 272         { "sockarg",            TOK_SOCKARG },
 273         { "tcpdatalen",         TOK_TCPDATALEN },
 274         { "tcpflags",           TOK_TCPFLAGS },
 275         { "tcpflgs",            TOK_TCPFLAGS },
 276         { "tcpoptions",         TOK_TCPOPTS },
 277         { "tcpopts",            TOK_TCPOPTS },
 278         { "tcpseq",             TOK_TCPSEQ },
 279         { "tcpack",             TOK_TCPACK },
 280         { "tcpwin",             TOK_TCPWIN },
 281         { "icmptype",           TOK_ICMPTYPES },
 282         { "icmptypes",          TOK_ICMPTYPES },
 283         { "dst-ip",             TOK_DSTIP },
 284         { "src-ip",             TOK_SRCIP },
 285         { "dst-port",           TOK_DSTPORT },
 286         { "src-port",           TOK_SRCPORT },
 287         { "proto",              TOK_PROTO },
 288         { "MAC",                TOK_MAC },
 289         { "mac",                TOK_MAC },
 290         { "mac-type",           TOK_MACTYPE },
 291         { "verrevpath",         TOK_VERREVPATH },
 292         { "versrcreach",        TOK_VERSRCREACH },
 293         { "antispoof",          TOK_ANTISPOOF },
 294         { "ipsec",              TOK_IPSEC },
 295         { "icmp6type",          TOK_ICMP6TYPES },
 296         { "icmp6types",         TOK_ICMP6TYPES },
 297         { "ext6hdr",            TOK_EXT6HDR},
 298         { "flow-id",            TOK_FLOWID},
 299         { "ipv6",               TOK_IPV6},
 300         { "ip6",                TOK_IPV6},
 301         { "ipv4",               TOK_IPV4},
 302         { "ip4",                TOK_IPV4},
 303         { "dst-ipv6",           TOK_DSTIP6},
 304         { "dst-ip6",            TOK_DSTIP6},
 305         { "src-ipv6",           TOK_SRCIP6},
 306         { "src-ip6",            TOK_SRCIP6},
 307         { "lookup",             TOK_LOOKUP},
 308         { "//",                 TOK_COMMENT },
 309
 310         { "not",                TOK_NOT },              /* pseudo option */
 311         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 312         { "or",                 TOK_OR },               /* pseudo option */
 313         { "|", /* escape */     TOK_OR },               /* pseudo option */
 314         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 315         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 316         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 317         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 318         { NULL, 0 }     /* terminator */
 319 };
 320
 321 /*
 322  * Helper routine to print a possibly unaligned uint64_t on
 323  * various platform. If width > 0, print the value with
 324  * the desired width, followed by a space;
 325  * otherwise, return the required width.
 326  */
 327 int
 328 pr_u64(uint64_t *pd, int width)
 329 {
 330 #ifdef TCC
 331 #define U64_FMT "I64"
 332 #else
 333 #define U64_FMT "llu"
 334 #endif
 335         uint64_t u;
 336         unsigned long long d;
 337
 338         bcopy (pd, &u, sizeof(u));
 339         d = u;
 340         return (width > 0) ?
 341                 printf("%*" U64_FMT " ", width, d) :
 342                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 343 #undef U64_FMT
 344 }
 345
 346 void *
 347 safe_calloc(size_t number, size_t size)
 348 {
 349         void *ret = calloc(number, size);
 350
 351         if (ret == NULL)
 352                 err(EX_OSERR, "calloc");
 353         return ret;
 354 }
 355
 356 void *
 357 safe_realloc(void *ptr, size_t size)
 358 {
 359         void *ret = realloc(ptr, size);
 360
 361         if (ret == NULL)
 362                 err(EX_OSERR, "realloc");
 363         return ret;
 364 }
 365
 366 /*
 367  * conditionally runs the command.
 368  * Selected options or negative -> getsockopt
 369  */
 370 int
 371 do_cmd(int optname, void *optval, uintptr_t optlen)
 372 {
 373         static int s = -1;      /* the socket */
 374         int i;
 375
 376         if (co.test_only)
 377                 return 0;
 378
 379         if (s == -1)
 380                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 381         if (s < 0)
 382                 err(EX_UNAVAILABLE, "socket");
 383
 384         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 385             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 386             optname == IP_FW_TABLE_GETSIZE ||
 387             optname == IP_FW_NAT_GET_CONFIG ||
 388             optname < 0 ||
 389             optname == IP_FW_NAT_GET_LOG) {
 390                 if (optname < 0)
 391                         optname = -optname;
 392                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 393                         (socklen_t *)optlen);
 394         } else {
 395                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 396         }
 397         return i;
 398 }
 399
 400 /**
 401  * match_token takes a table and a string, returns the value associated
 402  * with the string (-1 in case of failure).
 403  */
 404 int
 405 match_token(struct _s_x *table, char *string)
 406 {
 407         struct _s_x *pt;
 408         uint i = strlen(string);
 409
 410         for (pt = table ; i && pt->s != NULL ; pt++)
 411                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 412                         return pt->x;
 413         return -1;
 414 }
 415
 416 /**
 417  * match_value takes a table and a value, returns the string associated
 418  * with the value (NULL in case of failure).
 419  */
 420 char const *
 421 match_value(struct _s_x *p, int value)
 422 {
 423         for (; p->s != NULL; p++)
 424                 if (p->x == value)
 425                         return p->s;
 426         return NULL;
 427 }
 428
 429 /*
 430  * _substrcmp takes two strings and returns 1 if they do not match,
 431  * and 0 if they match exactly or the first string is a sub-string
 432  * of the second.  A warning is printed to stderr in the case that the
 433  * first string is a sub-string of the second.
 434  *
 435  * This function will be removed in the future through the usual
 436  * deprecation process.
 437  */
 438 int
 439 _substrcmp(const char *str1, const char* str2)
 440 {
 441
 442         if (strncmp(str1, str2, strlen(str1)) != 0)
 443                 return 1;
 444
 445         if (strlen(str1) != strlen(str2))
 446                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 447                     str1, str2);
 448         return 0;
 449 }
 450
 451 /*
 452  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 453  * and 0 if they match exactly or the second string is a sub-string
 454  * of the first.  A warning is printed to stderr in the case that the
 455  * first string does not match the third.
 456  *
 457  * This function exists to warn about the bizzare construction
 458  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 459  * for "bytes".  The problem is that in addition to accepting "by",
 460  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 461  * other string beginning with "by".
 462  *
 463  * This function will be removed in the future through the usual
 464  * deprecation process.
 465  */
 466 int
 467 _substrcmp2(const char *str1, const char* str2, const char* str3)
 468 {
 469
 470         if (strncmp(str1, str2, strlen(str2)) != 0)
 471                 return 1;
 472
 473         if (strcmp(str1, str3) != 0)
 474                 warnx("DEPRECATED: '%s' matched '%s'",
 475                     str1, str3);
 476         return 0;
 477 }
 478
 479 /*
 480  * prints one port, symbolic or numeric
 481  */
 482 static void
 483 print_port(int proto, uint16_t port)
 484 {
 485
 486         if (proto == IPPROTO_ETHERTYPE) {
 487                 char const *s;
 488
 489                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 490                         printf("%s", s);
 491                 else
 492                         printf("0x%04x", port);
 493         } else {
 494                 struct servent *se = NULL;
 495                 if (co.do_resolv) {
 496                         struct protoent *pe = getprotobynumber(proto);
 497
 498                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 499                 }
 500                 if (se)
 501                         printf("%s", se->s_name);
 502                 else
 503                         printf("%d", port);
 504         }
 505 }
 506
 507 static struct _s_x _port_name[] = {
 508         {"dst-port",    O_IP_DSTPORT},
 509         {"src-port",    O_IP_SRCPORT},
 510         {"ipid",        O_IPID},
 511         {"iplen",       O_IPLEN},
 512         {"ipttl",       O_IPTTL},
 513         {"mac-type",    O_MAC_TYPE},
 514         {"tcpdatalen",  O_TCPDATALEN},
 515         {"tagged",      O_TAGGED},
 516         {NULL,          0}
 517 };
 518
 519 /*
 520  * Print the values in a list 16-bit items of the types above.
 521  * XXX todo: add support for mask.
 522  */
 523 static void
 524 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 525 {
 526         uint16_t *p = cmd->ports;
 527         int i;
 528         char const *sep;
 529
 530         if (opcode != 0) {
 531                 sep = match_value(_port_name, opcode);
 532                 if (sep == NULL)
 533                         sep = "???";
 534                 printf (" %s", sep);
 535         }
 536         sep = " ";
 537         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 538                 printf("%s", sep);
 539                 print_port(proto, p[0]);
 540                 if (p[0] != p[1]) {
 541                         printf("-");
 542                         print_port(proto, p[1]);
 543                 }
 544                 sep = ",";
 545         }
 546 }
 547
 548 /*
 549  * Like strtol, but also translates service names into port numbers
 550  * for some protocols.
 551  * In particular:
 552  *      proto == -1 disables the protocol check;
 553  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 554  *      proto == <some value in /etc/protocols> matches the values there.
 555  * Returns *end == s in case the parameter is not found.
 556  */
 557 static int
 558 strtoport(char *s, char **end, int base, int proto)
 559 {
 560         char *p, *buf;
 561         char *s1;
 562         int i;
 563
 564         *end = s;               /* default - not found */
 565         if (*s == '\0')
 566                 return 0;       /* not found */
 567
 568         if (isdigit(*s))
 569                 return strtol(s, end, base);
 570
 571         /*
 572          * find separator. '\\' escapes the next char.
 573          */
 574         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 575                 if (*s1 == '\\' && s1[1] != '\0')
 576                         s1++;
 577
 578         buf = safe_calloc(s1 - s + 1, 1);
 579
 580         /*
 581          * copy into a buffer skipping backslashes
 582          */
 583         for (p = s, i = 0; p != s1 ; p++)
 584                 if (*p != '\\')
 585                         buf[i++] = *p;
 586         buf[i++] = '\0';
 587
 588         if (proto == IPPROTO_ETHERTYPE) {
 589                 i = match_token(ether_types, buf);
 590                 free(buf);
 591                 if (i != -1) {  /* found */
 592                         *end = s1;
 593                         return i;
 594                 }
 595         } else {
 596                 struct protoent *pe = NULL;
 597                 struct servent *se;
 598
 599                 if (proto != 0)
 600                         pe = getprotobynumber(proto);
 601                 setservent(1);
 602                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 603                 free(buf);
 604                 if (se != NULL) {
 605                         *end = s1;
 606                         return ntohs(se->s_port);
 607                 }
 608         }
 609         return 0;       /* not found */
 610 }
 611
 612 /*
 613  * Fill the body of the command with the list of port ranges.
 614  */
 615 static int
 616 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 617 {
 618         uint16_t a, b, *p = cmd->ports;
 619         int i = 0;
 620         char *s = av;
 621
 622         while (*s) {
 623                 a = strtoport(av, &s, 0, proto);
 624                 if (s == av)                    /* empty or invalid argument */
 625                         return (0);
 626
 627                 switch (*s) {
 628                 case '-':                       /* a range */
 629                         av = s + 1;
 630                         b = strtoport(av, &s, 0, proto);
 631                         /* Reject expressions like '1-abc' or '1-2-3'. */
 632                         if (s == av || (*s != ',' && *s != '\0'))
 633                                 return (0);
 634                         p[0] = a;
 635                         p[1] = b;
 636                         break;
 637                 case ',':                       /* comma separated list */
 638                 case '\0':
 639                         p[0] = p[1] = a;
 640                         break;
 641                 default:
 642                         warnx("port list: invalid separator <%c> in <%s>",
 643                                 *s, av);
 644                         return (0);
 645                 }
 646
 647                 i++;
 648                 p += 2;
 649                 av = s + 1;
 650         }
 651         if (i > 0) {
 652                 if (i + 1 > F_LEN_MASK)
 653                         errx(EX_DATAERR, "too many ports/ranges\n");
 654                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 655         }
 656         return (i);
 657 }
 658
 659 static struct _s_x icmpcodes[] = {
 660       { "net",                  ICMP_UNREACH_NET },
 661       { "host",                 ICMP_UNREACH_HOST },
 662       { "protocol",             ICMP_UNREACH_PROTOCOL },
 663       { "port",                 ICMP_UNREACH_PORT },
 664       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 665       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 666       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 667       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 668       { "isolated",             ICMP_UNREACH_ISOLATED },
 669       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 670       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 671       { "tosnet",               ICMP_UNREACH_TOSNET },
 672       { "toshost",              ICMP_UNREACH_TOSHOST },
 673       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 674       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 675       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 676       { NULL, 0 }
 677 };
 678
 679 static void
 680 fill_reject_code(u_short *codep, char *str)
 681 {
 682         int val;
 683         char *s;
 684
 685         val = strtoul(str, &s, 0);
 686         if (s == str || *s != '\0' || val >= 0x100)
 687                 val = match_token(icmpcodes, str);
 688         if (val < 0)
 689                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 690         *codep = val;
 691         return;
 692 }
 693
 694 static void
 695 print_reject_code(uint16_t code)
 696 {
 697         char const *s = match_value(icmpcodes, code);
 698
 699         if (s != NULL)
 700                 printf("unreach %s", s);
 701         else
 702                 printf("unreach %u", code);
 703 }
 704
 705 /*
 706  * Returns the number of bits set (from left) in a contiguous bitmask,
 707  * or -1 if the mask is not contiguous.
 708  * XXX this needs a proper fix.
 709  * This effectively works on masks in big-endian (network) format.
 710  * when compiled on little endian architectures.
 711  *
 712  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 713  * the first bit on the wire is bit 0 of the first byte.
 714  * len is the max length in bits.
 715  */
 716 int
 717 contigmask(uint8_t *p, int len)
 718 {
 719         int i, n;
 720
 721         for (i=0; i<len ; i++)
 722                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 723                         break;
 724         for (n=i+1; n < len; n++)
 725                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 726                         return -1; /* mask not contiguous */
 727         return i;
 728 }
 729
 730 /*
 731  * print flags set/clear in the two bitmasks passed as parameters.
 732  * There is a specialized check for f_tcpflags.
 733  */
 734 static void
 735 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 736 {
 737         char const *comma = "";
 738         int i;
 739         uint8_t set = cmd->arg1 & 0xff;
 740         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 741
 742         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 743                 printf(" setup");
 744                 return;
 745         }
 746
 747         printf(" %s ", name);
 748         for (i=0; list[i].x != 0; i++) {
 749                 if (set & list[i].x) {
 750                         set &= ~list[i].x;
 751                         printf("%s%s", comma, list[i].s);
 752                         comma = ",";
 753                 }
 754                 if (clear & list[i].x) {
 755                         clear &= ~list[i].x;
 756                         printf("%s!%s", comma, list[i].s);
 757                         comma = ",";
 758                 }
 759         }
 760 }
 761
 762 /*
 763  * Print the ip address contained in a command.
 764  */
 765 static void
 766 print_ip(ipfw_insn_ip *cmd, char const *s)
 767 {
 768         struct hostent *he = NULL;
 769         uint32_t len = F_LEN((ipfw_insn *)cmd);
 770         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 771
 772         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 773                 uint32_t d = a[1];
 774                 const char *arg = "<invalid>";
 775
 776                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 777                         arg = match_value(rule_options, lookup_key[d]);
 778                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 779                         arg, cmd->o.arg1);
 780                 return;
 781         }
 782         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 783
 784         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 785                 printf("me");
 786                 return;
 787         }
 788         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 789             cmd->o.opcode == O_IP_DST_LOOKUP) {
 790                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 791                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 792                         printf(",%u", *a);
 793                 printf(")");
 794                 return;
 795         }
 796         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 797                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 798                 int i, j;
 799                 char comma = '{';
 800
 801                 x = cmd->o.arg1 - 1;
 802                 x = htonl( ~x );
 803                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 804                 printf("%s/%d", inet_ntoa(cmd->addr),
 805                         contigmask((uint8_t *)&x, 32));
 806                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 807                 x &= 0xff; /* base */
 808                 /*
 809                  * Print bits and ranges.
 810                  * Locate first bit set (i), then locate first bit unset (j).
 811                  * If we have 3+ consecutive bits set, then print them as a
 812                  * range, otherwise only print the initial bit and rescan.
 813                  */
 814                 for (i=0; i < cmd->o.arg1; i++)
 815                         if (map[i/32] & (1<<(i & 31))) {
 816                                 for (j=i+1; j < cmd->o.arg1; j++)
 817                                         if (!(map[ j/32] & (1<<(j & 31))))
 818                                                 break;
 819                                 printf("%c%d", comma, i+x);
 820                                 if (j>i+2) { /* range has at least 3 elements */
 821                                         printf("-%d", j-1+x);
 822                                         i = j-1;
 823                                 }
 824                                 comma = ',';
 825                         }
 826                 printf("}");
 827                 return;
 828         }
 829         /*
 830          * len == 2 indicates a single IP, whereas lists of 1 or more
 831          * addr/mask pairs have len = (2n+1). We convert len to n so we
 832          * use that to count the number of entries.
 833          */
 834     for (len = len / 2; len > 0; len--, a += 2) {
 835         int mb =        /* mask length */
 836             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 837                 32 : contigmask((uint8_t *)&(a[1]), 32);
 838         if (mb == 32 && co.do_resolv)
 839                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 840         if (he != NULL)         /* resolved to name */
 841                 printf("%s", he->h_name);
 842         else if (mb == 0)       /* any */
 843                 printf("any");
 844         else {          /* numeric IP followed by some kind of mask */
 845                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 846                 if (mb < 0)
 847                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 848                 else if (mb < 32)
 849                         printf("/%d", mb);
 850         }
 851         if (len > 1)
 852                 printf(",");
 853     }
 854 }
 855
 856 /*
 857  * prints a MAC address/mask pair
 858  */
 859 static void
 860 print_mac(uint8_t *addr, uint8_t *mask)
 861 {
 862         int l = contigmask(mask, 48);
 863
 864         if (l == 0)
 865                 printf(" any");
 866         else {
 867                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 868                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 869                 if (l == -1)
 870                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 871                             mask[0], mask[1], mask[2],
 872                             mask[3], mask[4], mask[5]);
 873                 else if (l < 48)
 874                         printf("/%d", l);
 875         }
 876 }
 877
 878 static void
 879 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 880 {
 881         uint8_t type;
 882
 883         cmd->d[0] = 0;
 884         while (*av) {
 885                 if (*av == ',')
 886                         av++;
 887
 888                 type = strtoul(av, &av, 0);
 889
 890                 if (*av != ',' && *av != '\0')
 891                         errx(EX_DATAERR, "invalid ICMP type");
 892
 893                 if (type > 31)
 894                         errx(EX_DATAERR, "ICMP type out of range");
 895
 896                 cmd->d[0] |= 1 << type;
 897         }
 898         cmd->o.opcode = O_ICMPTYPE;
 899         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 900 }
 901
 902 static void
 903 print_icmptypes(ipfw_insn_u32 *cmd)
 904 {
 905         int i;
 906         char sep= ' ';
 907
 908         printf(" icmptypes");
 909         for (i = 0; i < 32; i++) {
 910                 if ( (cmd->d[0] & (1 << (i))) == 0)
 911                         continue;
 912                 printf("%c%d", sep, i);
 913                 sep = ',';
 914         }
 915 }
 916
 917 /*
 918  * show_ipfw() prints the body of an ipfw rule.
 919  * Because the standard rule has at least proto src_ip dst_ip, we use
 920  * a helper function to produce these entries if not provided explicitly.
 921  * The first argument is the list of fields we have, the second is
 922  * the list of fields we want to be printed.
 923  *
 924  * Special cases if we have provided a MAC header:
 925  *   + if the rule does not contain IP addresses/ports, do not print them;
 926  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 927  *
 928  * Once we have 'have_options', IP header fields are printed as options.
 929  */
 930 #define HAVE_PROTO      0x0001
 931 #define HAVE_SRCIP      0x0002
 932 #define HAVE_DSTIP      0x0004
 933 #define HAVE_PROTO4     0x0008
 934 #define HAVE_PROTO6     0x0010
 935 #define HAVE_IP         0x0100
 936 #define HAVE_OPTIONS    0x8000
 937
 938 static void
 939 show_prerequisites(int *flags, int want, int cmd __unused)
 940 {
 941         if (co.comment_only)
 942                 return;
 943         if ( (*flags & HAVE_IP) == HAVE_IP)
 944                 *flags |= HAVE_OPTIONS;
 945
 946         if ( !(*flags & HAVE_OPTIONS)) {
 947                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 948                         if ( (*flags & HAVE_PROTO4))
 949                                 printf(" ip4");
 950                         else if ( (*flags & HAVE_PROTO6))
 951                                 printf(" ip6");
 952                         else
 953                                 printf(" ip");
 954                 }
 955                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 956                         printf(" from any");
 957                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 958                         printf(" to any");
 959         }
 960         *flags |= want;
 961 }
 962
 963 static void
 964 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 965 {
 966         static int twidth = 0;
 967         int l;
 968         ipfw_insn *cmd, *tagptr = NULL;
 969         const char *comment = NULL;     /* ptr to comment if we have one */
 970         int proto = 0;          /* default */
 971         int flags = 0;  /* prerequisites */
 972         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 973         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 974         int or_block = 0;       /* we are in an or block */
 975         uint32_t set_disable;
 976
 977         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 978
 979         if (set_disable & (1 << rule->set)) { /* disabled */
 980                 if (!co.show_sets)
 981                         return;
 982                 else
 983                         printf("# DISABLED ");
 984         }
 985         printf("%05u ", rule->rulenum);
 986
 987         if (pcwidth > 0 || bcwidth > 0) {
 988                 pr_u64(&rule->pcnt, pcwidth);
 989                 pr_u64(&rule->bcnt, bcwidth);
 990         }
 991
 992         if (co.do_time == 2)
 993                 printf("%10u ", rule->timestamp);
 994         else if (co.do_time == 1) {
 995                 char timestr[30];
 996                 time_t t = (time_t)0;
 997
 998                 if (twidth == 0) {
 999                         strcpy(timestr, ctime(&t));
1000                         *strchr(timestr, '\n') = '\0';
1001                         twidth = strlen(timestr);
1002                 }
1003                 if (rule->timestamp) {
1004                         t = _long_to_time(rule->timestamp);
1005
1006                         strcpy(timestr, ctime(&t));
1007                         *strchr(timestr, '\n') = '\0';
1008                         printf("%s ", timestr);
1009                 } else {
1010                         printf("%*s", twidth, " ");
1011                 }
1012         }
1013
1014         if (co.show_sets)
1015                 printf("set %d ", rule->set);
1016
1017         /*
1018          * print the optional "match probability"
1019          */
1020         if (rule->cmd_len > 0) {
1021                 cmd = rule->cmd ;
1022                 if (cmd->opcode == O_PROB) {
1023                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1024                         double d = 1.0 * p->d[0];
1025
1026                         d = (d / 0x7fffffff);
1027                         printf("prob %f ", d);
1028                 }
1029         }
1030
1031         /*
1032          * first print actions
1033          */
1034         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1035                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1036                 switch(cmd->opcode) {
1037                 case O_CHECK_STATE:
1038                         printf("check-state");
1039                         /* avoid printing anything else */
1040                         flags = HAVE_PROTO | HAVE_SRCIP |
1041                                 HAVE_DSTIP | HAVE_IP;
1042                         break;
1043
1044                 case O_ACCEPT:
1045                         printf("allow");
1046                         break;
1047
1048                 case O_COUNT:
1049                         printf("count");
1050                         break;
1051
1052                 case O_DENY:
1053                         printf("deny");
1054                         break;
1055
1056                 case O_REJECT:
1057                         if (cmd->arg1 == ICMP_REJECT_RST)
1058                                 printf("reset");
1059                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1060                                 printf("reject");
1061                         else
1062                                 print_reject_code(cmd->arg1);
1063                         break;
1064
1065                 case O_UNREACH6:
1066                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1067                                 printf("reset6");
1068                         else
1069                                 print_unreach6_code(cmd->arg1);
1070                         break;
1071
1072                 case O_SKIPTO:
1073                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1074                         break;
1075
1076                 case O_PIPE:
1077                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1078                         break;
1079
1080                 case O_QUEUE:
1081                         PRINT_UINT_ARG("queue ", cmd->arg1);
1082                         break;
1083
1084                 case O_DIVERT:
1085                         PRINT_UINT_ARG("divert ", cmd->arg1);
1086                         break;
1087
1088                 case O_TEE:
1089                         PRINT_UINT_ARG("tee ", cmd->arg1);
1090                         break;
1091
1092                 case O_NETGRAPH:
1093                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1094                         break;
1095
1096                 case O_NGTEE:
1097                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1098                         break;
1099
1100                 case O_FORWARD_IP:
1101                     {
1102                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1103
1104                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1105                                 printf("fwd tablearg");
1106                         } else {
1107                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1108                         }
1109                         if (s->sa.sin_port)
1110                                 printf(",%d", s->sa.sin_port);
1111                     }
1112                         break;
1113
1114                 case O_FORWARD_IP6:
1115                     {
1116                         char buf[4 + INET6_ADDRSTRLEN + 1];
1117                         ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd;
1118
1119                         printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr,
1120                             buf, sizeof(buf)));
1121                         if (s->sa.sin6_port)
1122                                 printf(",%d", s->sa.sin6_port);
1123                     }
1124                         break;
1125
1126                 case O_LOG: /* O_LOG is printed last */
1127                         logptr = (ipfw_insn_log *)cmd;
1128                         break;
1129
1130                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1131                         altqptr = (ipfw_insn_altq *)cmd;
1132                         break;
1133
1134                 case O_TAG:
1135                         tagptr = cmd;
1136                         break;
1137
1138                 case O_NAT:
1139                         if (cmd->arg1 != 0)
1140                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1141                         else
1142                                 printf("nat global");
1143                         break;
1144
1145                 case O_SETFIB:
1146                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1147                         break;
1148
1149                 case O_REASS:
1150                         printf("reass");
1151                         break;
1152
1153                 case O_CALLRETURN:
1154                         if (cmd->len & F_NOT)
1155                                 printf("return");
1156                         else
1157                                 PRINT_UINT_ARG("call ", cmd->arg1);
1158                         break;
1159
1160                 default:
1161                         printf("** unrecognized action %d len %d ",
1162                                 cmd->opcode, cmd->len);
1163                 }
1164         }
1165         if (logptr) {
1166                 if (logptr->max_log > 0)
1167                         printf(" log logamount %d", logptr->max_log);
1168                 else
1169                         printf(" log");
1170         }
1171 #ifndef NO_ALTQ
1172         if (altqptr) {
1173                 print_altq_cmd(altqptr);
1174         }
1175 #endif
1176         if (tagptr) {
1177                 if (tagptr->len & F_NOT)
1178                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1179                 else
1180                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1181         }
1182
1183         /*
1184          * then print the body.
1185          */
1186         for (l = rule->act_ofs, cmd = rule->cmd ;
1187                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1188                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1189                         continue;
1190                 if (cmd->opcode == O_IP4) {
1191                         flags |= HAVE_PROTO4;
1192                         break;
1193                 } else if (cmd->opcode == O_IP6) {
1194                         flags |= HAVE_PROTO6;
1195                         break;
1196                 }
1197         }
1198         if (rule->_pad & 1) {   /* empty rules before options */
1199                 if (!co.do_compact) {
1200                         show_prerequisites(&flags, HAVE_PROTO, 0);
1201                         printf(" from any to any");
1202                 }
1203                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1204                          HAVE_SRCIP | HAVE_DSTIP;
1205         }
1206
1207         if (co.comment_only)
1208                 comment = "...";
1209
1210         for (l = rule->act_ofs, cmd = rule->cmd ;
1211                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1212                 /* useful alias */
1213                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1214
1215                 if (co.comment_only) {
1216                         if (cmd->opcode != O_NOP)
1217                                 continue;
1218                         printf(" // %s\n", (char *)(cmd + 1));
1219                         return;
1220                 }
1221
1222                 show_prerequisites(&flags, 0, cmd->opcode);
1223
1224                 switch(cmd->opcode) {
1225                 case O_PROB:
1226                         break;  /* done already */
1227
1228                 case O_PROBE_STATE:
1229                         break; /* no need to print anything here */
1230
1231                 case O_IP_SRC:
1232                 case O_IP_SRC_LOOKUP:
1233                 case O_IP_SRC_MASK:
1234                 case O_IP_SRC_ME:
1235                 case O_IP_SRC_SET:
1236                         show_prerequisites(&flags, HAVE_PROTO, 0);
1237                         if (!(flags & HAVE_SRCIP))
1238                                 printf(" from");
1239                         if ((cmd->len & F_OR) && !or_block)
1240                                 printf(" {");
1241                         print_ip((ipfw_insn_ip *)cmd,
1242                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1243                         flags |= HAVE_SRCIP;
1244                         break;
1245
1246                 case O_IP_DST:
1247                 case O_IP_DST_LOOKUP:
1248                 case O_IP_DST_MASK:
1249                 case O_IP_DST_ME:
1250                 case O_IP_DST_SET:
1251                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1252                         if (!(flags & HAVE_DSTIP))
1253                                 printf(" to");
1254                         if ((cmd->len & F_OR) && !or_block)
1255                                 printf(" {");
1256                         print_ip((ipfw_insn_ip *)cmd,
1257                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1258                         flags |= HAVE_DSTIP;
1259                         break;
1260
1261                 case O_IP6_SRC:
1262                 case O_IP6_SRC_MASK:
1263                 case O_IP6_SRC_ME:
1264                         show_prerequisites(&flags, HAVE_PROTO, 0);
1265                         if (!(flags & HAVE_SRCIP))
1266                                 printf(" from");
1267                         if ((cmd->len & F_OR) && !or_block)
1268                                 printf(" {");
1269                         print_ip6((ipfw_insn_ip6 *)cmd,
1270                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1271                         flags |= HAVE_SRCIP | HAVE_PROTO;
1272                         break;
1273
1274                 case O_IP6_DST:
1275                 case O_IP6_DST_MASK:
1276                 case O_IP6_DST_ME:
1277                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1278                         if (!(flags & HAVE_DSTIP))
1279                                 printf(" to");
1280                         if ((cmd->len & F_OR) && !or_block)
1281                                 printf(" {");
1282                         print_ip6((ipfw_insn_ip6 *)cmd,
1283                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1284                         flags |= HAVE_DSTIP;
1285                         break;
1286
1287                 case O_FLOW6ID:
1288                 print_flow6id( (ipfw_insn_u32 *) cmd );
1289                 flags |= HAVE_OPTIONS;
1290                 break;
1291
1292                 case O_IP_DSTPORT:
1293                         show_prerequisites(&flags,
1294                                 HAVE_PROTO | HAVE_SRCIP |
1295                                 HAVE_DSTIP | HAVE_IP, 0);
1296                 case O_IP_SRCPORT:
1297                         if (flags & HAVE_DSTIP)
1298                                 flags |= HAVE_IP;
1299                         show_prerequisites(&flags,
1300                                 HAVE_PROTO | HAVE_SRCIP, 0);
1301                         if ((cmd->len & F_OR) && !or_block)
1302                                 printf(" {");
1303                         if (cmd->len & F_NOT)
1304                                 printf(" not");
1305                         print_newports((ipfw_insn_u16 *)cmd, proto,
1306                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1307                         break;
1308
1309                 case O_PROTO: {
1310                         struct protoent *pe = NULL;
1311
1312                         if ((cmd->len & F_OR) && !or_block)
1313                                 printf(" {");
1314                         if (cmd->len & F_NOT)
1315                                 printf(" not");
1316                         proto = cmd->arg1;
1317                         pe = getprotobynumber(cmd->arg1);
1318                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1319                             !(flags & HAVE_PROTO))
1320                                 show_prerequisites(&flags,
1321                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1322                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1323                         if (flags & HAVE_OPTIONS)
1324                                 printf(" proto");
1325                         if (pe)
1326                                 printf(" %s", pe->p_name);
1327                         else
1328                                 printf(" %u", cmd->arg1);
1329                         }
1330                         flags |= HAVE_PROTO;
1331                         break;
1332
1333                 default: /*options ... */
1334                         if (!(cmd->len & (F_OR|F_NOT)))
1335                                 if (((cmd->opcode == O_IP6) &&
1336                                     (flags & HAVE_PROTO6)) ||
1337                                     ((cmd->opcode == O_IP4) &&
1338                                     (flags & HAVE_PROTO4)))
1339                                         break;
1340                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1341                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1342                         if ((cmd->len & F_OR) && !or_block)
1343                                 printf(" {");
1344                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1345                                 printf(" not");
1346                         switch(cmd->opcode) {
1347                         case O_MACADDR2: {
1348                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1349
1350                                 printf(" MAC");
1351                                 print_mac(m->addr, m->mask);
1352                                 print_mac(m->addr + 6, m->mask + 6);
1353                                 }
1354                                 break;
1355
1356                         case O_MAC_TYPE:
1357                                 print_newports((ipfw_insn_u16 *)cmd,
1358                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1359                                 break;
1360
1361
1362                         case O_FRAG:
1363                                 printf(" frag");
1364                                 break;
1365
1366                         case O_FIB:
1367                                 printf(" fib %u", cmd->arg1 );
1368                                 break;
1369                         case O_SOCKARG:
1370                                 printf(" sockarg");
1371                                 break;
1372
1373                         case O_IN:
1374                                 printf(cmd->len & F_NOT ? " out" : " in");
1375                                 break;
1376
1377                         case O_DIVERTED:
1378                                 switch (cmd->arg1) {
1379                                 case 3:
1380                                         printf(" diverted");
1381                                         break;
1382                                 case 1:
1383                                         printf(" diverted-loopback");
1384                                         break;
1385                                 case 2:
1386                                         printf(" diverted-output");
1387                                         break;
1388                                 default:
1389                                         printf(" diverted-?<%u>", cmd->arg1);
1390                                         break;
1391                                 }
1392                                 break;
1393
1394                         case O_LAYER2:
1395                                 printf(" layer2");
1396                                 break;
1397                         case O_XMIT:
1398                         case O_RECV:
1399                         case O_VIA:
1400                             {
1401                                 char const *s;
1402                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1403
1404                                 if (cmd->opcode == O_XMIT)
1405                                         s = "xmit";
1406                                 else if (cmd->opcode == O_RECV)
1407                                         s = "recv";
1408                                 else /* if (cmd->opcode == O_VIA) */
1409                                         s = "via";
1410                                 if (cmdif->name[0] == '\0')
1411                                         printf(" %s %s", s,
1412                                             inet_ntoa(cmdif->p.ip));
1413                                 else
1414                                         printf(" %s %s", s, cmdif->name);
1415
1416                                 break;
1417                             }
1418                         case O_IPID:
1419                                 if (F_LEN(cmd) == 1)
1420                                     printf(" ipid %u", cmd->arg1 );
1421                                 else
1422                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1423                                         O_IPID);
1424                                 break;
1425
1426                         case O_IPTTL:
1427                                 if (F_LEN(cmd) == 1)
1428                                     printf(" ipttl %u", cmd->arg1 );
1429                                 else
1430                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1431                                         O_IPTTL);
1432                                 break;
1433
1434                         case O_IPVER:
1435                                 printf(" ipver %u", cmd->arg1 );
1436                                 break;
1437
1438                         case O_IPPRECEDENCE:
1439                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1440                                 break;
1441
1442                         case O_IPLEN:
1443                                 if (F_LEN(cmd) == 1)
1444                                     printf(" iplen %u", cmd->arg1 );
1445                                 else
1446                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1447                                         O_IPLEN);
1448                                 break;
1449
1450                         case O_IPOPT:
1451                                 print_flags("ipoptions", cmd, f_ipopts);
1452                                 break;
1453
1454                         case O_IPTOS:
1455                                 print_flags("iptos", cmd, f_iptos);
1456                                 break;
1457
1458                         case O_ICMPTYPE:
1459                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1460                                 break;
1461
1462                         case O_ESTAB:
1463                                 printf(" established");
1464                                 break;
1465
1466                         case O_TCPDATALEN:
1467                                 if (F_LEN(cmd) == 1)
1468                                     printf(" tcpdatalen %u", cmd->arg1 );
1469                                 else
1470                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1471                                         O_TCPDATALEN);
1472                                 break;
1473
1474                         case O_TCPFLAGS:
1475                                 print_flags("tcpflags", cmd, f_tcpflags);
1476                                 break;
1477
1478                         case O_TCPOPTS:
1479                                 print_flags("tcpoptions", cmd, f_tcpopts);
1480                                 break;
1481
1482                         case O_TCPWIN:
1483                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1484                                 break;
1485
1486                         case O_TCPACK:
1487                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1488                                 break;
1489
1490                         case O_TCPSEQ:
1491                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1492                                 break;
1493
1494                         case O_UID:
1495                             {
1496                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1497
1498                                 if (pwd)
1499                                         printf(" uid %s", pwd->pw_name);
1500                                 else
1501                                         printf(" uid %u", cmd32->d[0]);
1502                             }
1503                                 break;
1504
1505                         case O_GID:
1506                             {
1507                                 struct group *grp = getgrgid(cmd32->d[0]);
1508
1509                                 if (grp)
1510                                         printf(" gid %s", grp->gr_name);
1511                                 else
1512                                         printf(" gid %u", cmd32->d[0]);
1513                             }
1514                                 break;
1515
1516                         case O_JAIL:
1517                                 printf(" jail %d", cmd32->d[0]);
1518                                 break;
1519
1520                         case O_VERREVPATH:
1521                                 printf(" verrevpath");
1522                                 break;
1523
1524                         case O_VERSRCREACH:
1525                                 printf(" versrcreach");
1526                                 break;
1527
1528                         case O_ANTISPOOF:
1529                                 printf(" antispoof");
1530                                 break;
1531
1532                         case O_IPSEC:
1533                                 printf(" ipsec");
1534                                 break;
1535
1536                         case O_NOP:
1537                                 comment = (char *)(cmd + 1);
1538                                 break;
1539
1540                         case O_KEEP_STATE:
1541                                 printf(" keep-state");
1542                                 break;
1543
1544                         case O_LIMIT: {
1545                                 struct _s_x *p = limit_masks;
1546                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1547                                 uint8_t x = c->limit_mask;
1548                                 char const *comma = " ";
1549
1550                                 printf(" limit");
1551                                 for (; p->x != 0 ; p++)
1552                                         if ((x & p->x) == p->x) {
1553                                                 x &= ~p->x;
1554                                                 printf("%s%s", comma, p->s);
1555                                                 comma = ",";
1556                                         }
1557                                 PRINT_UINT_ARG(" ", c->conn_limit);
1558                                 break;
1559                         }
1560
1561                         case O_IP6:
1562                                 printf(" ip6");
1563                                 break;
1564
1565                         case O_IP4:
1566                                 printf(" ip4");
1567                                 break;
1568
1569                         case O_ICMP6TYPE:
1570                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1571                                 break;
1572
1573                         case O_EXT_HDR:
1574                                 print_ext6hdr( (ipfw_insn *) cmd );
1575                                 break;
1576
1577                         case O_TAGGED:
1578                                 if (F_LEN(cmd) == 1)
1579                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1580                                 else
1581                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1582                                             O_TAGGED);
1583                                 break;
1584
1585                         default:
1586                                 printf(" [opcode %d len %d]",
1587                                     cmd->opcode, cmd->len);
1588                         }
1589                 }
1590                 if (cmd->len & F_OR) {
1591                         printf(" or");
1592                         or_block = 1;
1593                 } else if (or_block) {
1594                         printf(" }");
1595                         or_block = 0;
1596                 }
1597         }
1598         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1599                                               | HAVE_IP, 0);
1600         if (comment)
1601                 printf(" // %s", comment);
1602         printf("\n");
1603 }
1604
1605 static void
1606 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1607 {
1608         struct protoent *pe;
1609         struct in_addr a;
1610         uint16_t rulenum;
1611         char buf[INET6_ADDRSTRLEN];
1612
1613         if (!co.do_expired) {
1614                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1615                         return;
1616         }
1617         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1618         printf("%05d", rulenum);
1619         if (pcwidth > 0 || bcwidth > 0) {
1620                 printf(" ");
1621                 pr_u64(&d->pcnt, pcwidth);
1622                 pr_u64(&d->bcnt, bcwidth);
1623                 printf("(%ds)", d->expire);
1624         }
1625         switch (d->dyn_type) {
1626         case O_LIMIT_PARENT:
1627                 printf(" PARENT %d", d->count);
1628                 break;
1629         case O_LIMIT:
1630                 printf(" LIMIT");
1631                 break;
1632         case O_KEEP_STATE: /* bidir, no mask */
1633                 printf(" STATE");
1634                 break;
1635         }
1636
1637         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1638                 printf(" %s", pe->p_name);
1639         else
1640                 printf(" proto %u", d->id.proto);
1641
1642         if (d->id.addr_type == 4) {
1643                 a.s_addr = htonl(d->id.src_ip);
1644                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1645
1646                 a.s_addr = htonl(d->id.dst_ip);
1647                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1648         } else if (d->id.addr_type == 6) {
1649                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1650                     sizeof(buf)), d->id.src_port);
1651                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1652                     sizeof(buf)), d->id.dst_port);
1653         } else
1654                 printf(" UNKNOWN <-> UNKNOWN\n");
1655
1656         printf("\n");
1657 }
1658
1659 /*
1660  * This one handles all set-related commands
1661  *      ipfw set { show | enable | disable }
1662  *      ipfw set swap X Y
1663  *      ipfw set move X to Y
1664  *      ipfw set move rule X to Y
1665  */
1666 void
1667 ipfw_sets_handler(char *av[])
1668 {
1669         uint32_t set_disable, masks[2];
1670         int i, nbytes;
1671         uint16_t rulenum;
1672         uint8_t cmd, new_set;
1673
1674         av++;
1675
1676         if (av[0] == NULL)
1677                 errx(EX_USAGE, "set needs command");
1678         if (_substrcmp(*av, "show") == 0) {
1679                 void *data = NULL;
1680                 char const *msg;
1681                 int nalloc;
1682
1683                 nalloc = nbytes = sizeof(struct ip_fw);
1684                 while (nbytes >= nalloc) {
1685                         if (data)
1686                                 free(data);
1687                         nalloc = nalloc * 2 + 200;
1688                         nbytes = nalloc;
1689                         data = safe_calloc(1, nbytes);
1690                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1691                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1692                 }
1693
1694                 bcopy(&((struct ip_fw *)data)->next_rule,
1695                         &set_disable, sizeof(set_disable));
1696
1697                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1698                         if ((set_disable & (1<<i))) {
1699                                 printf("%s %d", msg, i);
1700                                 msg = "";
1701                         }
1702                 msg = (set_disable) ? " enable" : "enable";
1703                 for (i = 0; i < RESVD_SET; i++)
1704                         if (!(set_disable & (1<<i))) {
1705                                 printf("%s %d", msg, i);
1706                                 msg = "";
1707                         }
1708                 printf("\n");
1709         } else if (_substrcmp(*av, "swap") == 0) {
1710                 av++;
1711                 if ( av[0] == NULL || av[1] == NULL )
1712                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1713                 rulenum = atoi(av[0]);
1714                 new_set = atoi(av[1]);
1715                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1716                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1717                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1718                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1719                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1720                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1721         } else if (_substrcmp(*av, "move") == 0) {
1722                 av++;
1723                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1724                         cmd = 2;
1725                         av++;
1726                 } else
1727                         cmd = 3;
1728                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1729                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1730                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1731                 rulenum = atoi(av[0]);
1732                 new_set = atoi(av[2]);
1733                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1734                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1735                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1736                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1737                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1738                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1739                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1740         } else if (_substrcmp(*av, "disable") == 0 ||
1741                    _substrcmp(*av, "enable") == 0 ) {
1742                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1743
1744                 av++;
1745                 masks[0] = masks[1] = 0;
1746
1747                 while (av[0]) {
1748                         if (isdigit(**av)) {
1749                                 i = atoi(*av);
1750                                 if (i < 0 || i > RESVD_SET)
1751                                         errx(EX_DATAERR,
1752                                             "invalid set number %d\n", i);
1753                                 masks[which] |= (1<<i);
1754                         } else if (_substrcmp(*av, "disable") == 0)
1755                                 which = 0;
1756                         else if (_substrcmp(*av, "enable") == 0)
1757                                 which = 1;
1758                         else
1759                                 errx(EX_DATAERR,
1760                                         "invalid set command %s\n", *av);
1761                         av++;
1762                 }
1763                 if ( (masks[0] & masks[1]) != 0 )
1764                         errx(EX_DATAERR,
1765                             "cannot enable and disable the same set\n");
1766
1767                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1768                 if (i)
1769                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1770         } else
1771                 errx(EX_USAGE, "invalid set command %s\n", *av);
1772 }
1773
1774 void
1775 ipfw_sysctl_handler(char *av[], int which)
1776 {
1777         av++;
1778
1779         if (av[0] == NULL) {
1780                 warnx("missing keyword to enable/disable\n");
1781         } else if (_substrcmp(*av, "firewall") == 0) {
1782                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1783                     &which, sizeof(which));
1784                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1785                     &which, sizeof(which));
1786         } else if (_substrcmp(*av, "one_pass") == 0) {
1787                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1788                     &which, sizeof(which));
1789         } else if (_substrcmp(*av, "debug") == 0) {
1790                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1791                     &which, sizeof(which));
1792         } else if (_substrcmp(*av, "verbose") == 0) {
1793                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1794                     &which, sizeof(which));
1795         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1796                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1797                     &which, sizeof(which));
1798 #ifndef NO_ALTQ
1799         } else if (_substrcmp(*av, "altq") == 0) {
1800                 altq_set_enabled(which);
1801 #endif
1802         } else {
1803                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1804         }
1805 }
1806
1807 void
1808 ipfw_list(int ac, char *av[], int show_counters)
1809 {
1810         struct ip_fw *r;
1811         ipfw_dyn_rule *dynrules, *d;
1812
1813 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1814         char *lim;
1815         void *data = NULL;
1816         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1817         int exitval = EX_OK;
1818         int lac;
1819         char **lav;
1820         u_long rnum, last;
1821         char *endptr;
1822         int seen = 0;
1823         uint8_t set;
1824
1825         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1826         int nalloc = 1024;      /* start somewhere... */
1827
1828         last = 0;
1829
1830         if (co.test_only) {
1831                 fprintf(stderr, "Testing only, list disabled\n");
1832                 return;
1833         }
1834         if (co.do_pipe) {
1835                 dummynet_list(ac, av, show_counters);
1836                 return;
1837         }
1838
1839         ac--;
1840         av++;
1841
1842         /* get rules or pipes from kernel, resizing array as necessary */
1843         nbytes = nalloc;
1844
1845         while (nbytes >= nalloc) {
1846                 nalloc = nalloc * 2 + 200;
1847                 nbytes = nalloc;
1848                 data = safe_realloc(data, nbytes);
1849                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1850                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1851                                 co.do_pipe ? "DUMMYNET" : "FW");
1852         }
1853
1854         /*
1855          * Count static rules. They have variable size so we
1856          * need to scan the list to count them.
1857          */
1858         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1859                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1860                     ++nstat, r = NEXT(r) )
1861                 ; /* nothing */
1862
1863         /*
1864          * Count dynamic rules. This is easier as they have
1865          * fixed size.
1866          */
1867         r = NEXT(r);
1868         dynrules = (ipfw_dyn_rule *)r ;
1869         n = (char *)r - (char *)data;
1870         ndyn = (nbytes - n) / sizeof *dynrules;
1871
1872         /* if showing stats, figure out column widths ahead of time */
1873         bcwidth = pcwidth = 0;
1874         if (show_counters) {
1875                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1876                         /* skip rules from another set */
1877                         if (co.use_set && r->set != co.use_set - 1)
1878                                 continue;
1879
1880                         /* packet counter */
1881                         width = pr_u64(&r->pcnt, 0);
1882                         if (width > pcwidth)
1883                                 pcwidth = width;
1884
1885                         /* byte counter */
1886                         width = pr_u64(&r->bcnt, 0);
1887                         if (width > bcwidth)
1888                                 bcwidth = width;
1889                 }
1890         }
1891         if (co.do_dynamic && ndyn) {
1892                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1893                         if (co.use_set) {
1894                                 /* skip rules from another set */
1895                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1896                                       &set, sizeof(uint8_t));
1897                                 if (set != co.use_set - 1)
1898                                         continue;
1899                         }
1900                         width = pr_u64(&d->pcnt, 0);
1901                         if (width > pcwidth)
1902                                 pcwidth = width;
1903
1904                         width = pr_u64(&d->bcnt, 0);
1905                         if (width > bcwidth)
1906                                 bcwidth = width;
1907                 }
1908         }
1909         /* if no rule numbers were specified, list all rules */
1910         if (ac == 0) {
1911                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1912                         if (co.use_set && r->set != co.use_set - 1)
1913                                 continue;
1914                         show_ipfw(r, pcwidth, bcwidth);
1915                 }
1916
1917                 if (co.do_dynamic && ndyn) {
1918                         printf("## Dynamic rules (%d):\n", ndyn);
1919                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1920                                 if (co.use_set) {
1921                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1922                                               &set, sizeof(uint8_t));
1923                                         if (set != co.use_set - 1)
1924                                                 continue;
1925                                 }
1926                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1927                 }
1928                 }
1929                 goto done;
1930         }
1931
1932         /* display specific rules requested on command line */
1933
1934         for (lac = ac, lav = av; lac != 0; lac--) {
1935                 /* convert command line rule # */
1936                 last = rnum = strtoul(*lav++, &endptr, 10);
1937                 if (*endptr == '-')
1938                         last = strtoul(endptr+1, &endptr, 10);
1939                 if (*endptr) {
1940                         exitval = EX_USAGE;
1941                         warnx("invalid rule number: %s", *(lav - 1));
1942                         continue;
1943                 }
1944                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1945                         if (r->rulenum > last)
1946                                 break;
1947                         if (co.use_set && r->set != co.use_set - 1)
1948                                 continue;
1949                         if (r->rulenum >= rnum && r->rulenum <= last) {
1950                                 show_ipfw(r, pcwidth, bcwidth);
1951                                 seen = 1;
1952                         }
1953                 }
1954                 if (!seen) {
1955                         /* give precedence to other error(s) */
1956                         if (exitval == EX_OK)
1957                                 exitval = EX_UNAVAILABLE;
1958                         warnx("rule %lu does not exist", rnum);
1959                 }
1960         }
1961
1962         if (co.do_dynamic && ndyn) {
1963                 printf("## Dynamic rules:\n");
1964                 for (lac = ac, lav = av; lac != 0; lac--) {
1965                         last = rnum = strtoul(*lav++, &endptr, 10);
1966                         if (*endptr == '-')
1967                                 last = strtoul(endptr+1, &endptr, 10);
1968                         if (*endptr)
1969                                 /* already warned */
1970                                 continue;
1971                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1972                                 uint16_t rulenum;
1973
1974                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1975                                 if (rulenum > rnum)
1976                                         break;
1977                                 if (co.use_set) {
1978                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1979                                               &set, sizeof(uint8_t));
1980                                         if (set != co.use_set - 1)
1981                                                 continue;
1982                                 }
1983                                 if (r->rulenum >= rnum && r->rulenum <= last)
1984                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1985                         }
1986                 }
1987         }
1988
1989         ac = 0;
1990
1991 done:
1992         free(data);
1993
1994         if (exitval != EX_OK)
1995                 exit(exitval);
1996 #undef NEXT
1997 }
1998
1999 static int
2000 lookup_host (char *host, struct in_addr *ipaddr)
2001 {
2002         struct hostent *he;
2003
2004         if (!inet_aton(host, ipaddr)) {
2005                 if ((he = gethostbyname(host)) == NULL)
2006                         return(-1);
2007                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
2008         }
2009         return(0);
2010 }
2011
2012 /*
2013  * fills the addr and mask fields in the instruction as appropriate from av.
2014  * Update length as appropriate.
2015  * The following formats are allowed:
2016  *      me      returns O_IP_*_ME
2017  *      1.2.3.4         single IP address
2018  *      1.2.3.4:5.6.7.8 address:mask
2019  *      1.2.3.4/24      address/mask
2020  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2021  * We can have multiple comma-separated address/mask entries.
2022  */
2023 static void
2024 fill_ip(ipfw_insn_ip *cmd, char *av)
2025 {
2026         int len = 0;
2027         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2028
2029         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2030
2031         if (_substrcmp(av, "any") == 0)
2032                 return;
2033
2034         if (_substrcmp(av, "me") == 0) {
2035                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2036                 return;
2037         }
2038
2039         if (strncmp(av, "table(", 6) == 0) {
2040                 char *p = strchr(av + 6, ',');
2041
2042                 if (p)
2043                         *p++ = '\0';
2044                 cmd->o.opcode = O_IP_DST_LOOKUP;
2045                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2046                 if (p) {
2047                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2048                         d[0] = strtoul(p, NULL, 0);
2049                 } else
2050                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2051                 return;
2052         }
2053
2054     while (av) {
2055         /*
2056          * After the address we can have '/' or ':' indicating a mask,
2057          * ',' indicating another address follows, '{' indicating a
2058          * set of addresses of unspecified size.
2059          */
2060         char *t = NULL, *p = strpbrk(av, "/:,{");
2061         int masklen;
2062         char md, nd = '\0';
2063
2064         if (p) {
2065                 md = *p;
2066                 *p++ = '\0';
2067                 if ((t = strpbrk(p, ",{")) != NULL) {
2068                         nd = *t;
2069                         *t = '\0';
2070                 }
2071         } else
2072                 md = '\0';
2073
2074         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2075                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2076         switch (md) {
2077         case ':':
2078                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2079                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2080                 break;
2081         case '/':
2082                 masklen = atoi(p);
2083                 if (masklen == 0)
2084                         d[1] = htonl(0);        /* mask */
2085                 else if (masklen > 32)
2086                         errx(EX_DATAERR, "bad width ``%s''", p);
2087                 else
2088                         d[1] = htonl(~0 << (32 - masklen));
2089                 break;
2090         case '{':       /* no mask, assume /24 and put back the '{' */
2091                 d[1] = htonl(~0 << (32 - 24));
2092                 *(--p) = md;
2093                 break;
2094
2095         case ',':       /* single address plus continuation */
2096                 *(--p) = md;
2097                 /* FALLTHROUGH */
2098         case 0:         /* initialization value */
2099         default:
2100                 d[1] = htonl(~0);       /* force /32 */
2101                 break;
2102         }
2103         d[0] &= d[1];           /* mask base address with mask */
2104         if (t)
2105                 *t = nd;
2106         /* find next separator */
2107         if (p)
2108                 p = strpbrk(p, ",{");
2109         if (p && *p == '{') {
2110                 /*
2111                  * We have a set of addresses. They are stored as follows:
2112                  *   arg1       is the set size (powers of 2, 2..256)
2113                  *   addr       is the base address IN HOST FORMAT
2114                  *   mask..     is an array of arg1 bits (rounded up to
2115                  *              the next multiple of 32) with bits set
2116                  *              for each host in the map.
2117                  */
2118                 uint32_t *map = (uint32_t *)&cmd->mask;
2119                 int low, high;
2120                 int i = contigmask((uint8_t *)&(d[1]), 32);
2121
2122                 if (len > 0)
2123                         errx(EX_DATAERR, "address set cannot be in a list");
2124                 if (i < 24 || i > 31)
2125                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2126                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2127                 d[0] = ntohl(d[0]);             /* base addr in host format */
2128                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2129                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2130                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2131                         map[i] = 0;     /* clear map */
2132
2133                 av = p + 1;
2134                 low = d[0] & 0xff;
2135                 high = low + cmd->o.arg1 - 1;
2136                 /*
2137                  * Here, i stores the previous value when we specify a range
2138                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2139                  * have no previous value.
2140                  */
2141                 i = -1; /* previous value in a range */
2142                 while (isdigit(*av)) {
2143                         char *s;
2144                         int a = strtol(av, &s, 0);
2145
2146                         if (s == av) { /* no parameter */
2147                             if (*av != '}')
2148                                 errx(EX_DATAERR, "set not closed\n");
2149                             if (i != -1)
2150                                 errx(EX_DATAERR, "incomplete range %d-", i);
2151                             break;
2152                         }
2153                         if (a < low || a > high)
2154                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2155                                 a, low, high);
2156                         a -= low;
2157                         if (i == -1)    /* no previous in range */
2158                             i = a;
2159                         else {          /* check that range is valid */
2160                             if (i > a)
2161                                 errx(EX_DATAERR, "invalid range %d-%d",
2162                                         i+low, a+low);
2163                             if (*s == '-')
2164                                 errx(EX_DATAERR, "double '-' in range");
2165                         }
2166                         for (; i <= a; i++)
2167                             map[i/32] |= 1<<(i & 31);
2168                         i = -1;
2169                         if (*s == '-')
2170                             i = a;
2171                         else if (*s == '}')
2172                             break;
2173                         av = s+1;
2174                 }
2175                 return;
2176         }
2177         av = p;
2178         if (av)                 /* then *av must be a ',' */
2179                 av++;
2180
2181         /* Check this entry */
2182         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2183                 /*
2184                  * 'any' turns the entire list into a NOP.
2185                  * 'not any' never matches, so it is removed from the
2186                  * list unless it is the only item, in which case we
2187                  * report an error.
2188                  */
2189                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2190                         if (av == NULL && len == 0) /* only this entry */
2191                                 errx(EX_DATAERR, "not any never matches");
2192                 }
2193                 /* else do nothing and skip this entry */
2194                 return;
2195         }
2196         /* A single IP can be stored in an optimized format */
2197         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2198                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2199                 return;
2200         }
2201         len += 2;       /* two words... */
2202         d += 2;
2203     } /* end while */
2204     if (len + 1 > F_LEN_MASK)
2205         errx(EX_DATAERR, "address list too long");
2206     cmd->o.len |= len+1;
2207 }
2208
2209
2210 /* n2mask sets n bits of the mask */
2211 void
2212 n2mask(struct in6_addr *mask, int n)
2213 {
2214         static int      minimask[9] =
2215             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2216         u_char          *p;
2217
2218         memset(mask, 0, sizeof(struct in6_addr));
2219         p = (u_char *) mask;
2220         for (; n > 0; p++, n -= 8) {
2221                 if (n >= 8)
2222                         *p = 0xff;
2223                 else
2224                         *p = minimask[n];
2225         }
2226         return;
2227 }
2228
2229 /*
2230  * helper function to process a set of flags and set bits in the
2231  * appropriate masks.
2232  */
2233 static void
2234 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2235         struct _s_x *flags, char *p)
2236 {
2237         uint8_t set=0, clear=0;
2238
2239         while (p && *p) {
2240                 char *q;        /* points to the separator */
2241                 int val;
2242                 uint8_t *which; /* mask we are working on */
2243
2244                 if (*p == '!') {
2245                         p++;
2246                         which = &clear;
2247                 } else
2248                         which = &set;
2249                 q = strchr(p, ',');
2250                 if (q)
2251                         *q++ = '\0';
2252                 val = match_token(flags, p);
2253                 if (val <= 0)
2254                         errx(EX_DATAERR, "invalid flag %s", p);
2255                 *which |= (uint8_t)val;
2256                 p = q;
2257         }
2258         cmd->opcode = opcode;
2259         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2260         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2261 }
2262
2263
2264 void
2265 ipfw_delete(char *av[])
2266 {
2267         uint32_t rulenum;
2268         int i;
2269         int exitval = EX_OK;
2270         int do_set = 0;
2271
2272         av++;
2273         NEED1("missing rule specification");
2274         if ( *av && _substrcmp(*av, "set") == 0) {
2275                 /* Do not allow using the following syntax:
2276                  *      ipfw set N delete set M
2277                  */
2278                 if (co.use_set)
2279                         errx(EX_DATAERR, "invalid syntax");
2280                 do_set = 1;     /* delete set */
2281                 av++;
2282         }
2283
2284         /* Rule number */
2285         while (*av && isdigit(**av)) {
2286                 i = atoi(*av); av++;
2287                 if (co.do_nat) {
2288                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2289                         if (exitval) {
2290                                 exitval = EX_UNAVAILABLE;
2291                                 warn("rule %u not available", i);
2292                         }
2293                 } else if (co.do_pipe) {
2294                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2295                 } else {
2296                         if (co.use_set)
2297                                 rulenum = (i & 0xffff) | (5 << 24) |
2298                                     ((co.use_set - 1) << 16);
2299                         else
2300                         rulenum =  (i & 0xffff) | (do_set << 24);
2301                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2302                         if (i) {
2303                                 exitval = EX_UNAVAILABLE;
2304                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2305                                     rulenum);
2306                         }
2307                 }
2308         }
2309         if (exitval != EX_OK)
2310                 exit(exitval);
2311 }
2312
2313
2314 /*
2315  * fill the interface structure. We do not check the name as we can
2316  * create interfaces dynamically, so checking them at insert time
2317  * makes relatively little sense.
2318  * Interface names containing '*', '?', or '[' are assumed to be shell
2319  * patterns which match interfaces.
2320  */
2321 static void
2322 fill_iface(ipfw_insn_if *cmd, char *arg)
2323 {
2324         cmd->name[0] = '\0';
2325         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2326
2327         /* Parse the interface or address */
2328         if (strcmp(arg, "any") == 0)
2329                 cmd->o.len = 0;         /* effectively ignore this command */
2330         else if (!isdigit(*arg)) {
2331                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2332                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2333         } else if (!inet_aton(arg, &cmd->p.ip))
2334                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2335 }
2336
2337 static void
2338 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2339 {
2340         int i;
2341         size_t l;
2342         char *ap, *ptr, *optr;
2343         struct ether_addr *mac;
2344         const char *macset = "0123456789abcdefABCDEF:";
2345
2346         if (strcmp(p, "any") == 0) {
2347                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2348                         addr[i] = mask[i] = 0;
2349                 return;
2350         }
2351
2352         optr = ptr = strdup(p);
2353         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2354                 l = strlen(ap);
2355                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2356                         errx(EX_DATAERR, "Incorrect MAC address");
2357                 bcopy(mac, addr, ETHER_ADDR_LEN);
2358         } else
2359                 errx(EX_DATAERR, "Incorrect MAC address");
2360
2361         if (ptr != NULL) { /* we have mask? */
2362                 if (p[ptr - optr - 1] == '/') { /* mask len */
2363                         long ml = strtol(ptr, &ap, 10);
2364                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2365                                 errx(EX_DATAERR, "Incorrect mask length");
2366                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2367                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2368                 } else { /* mask */
2369                         l = strlen(ptr);
2370                         if (strspn(ptr, macset) != l ||
2371                             (mac = ether_aton(ptr)) == NULL)
2372                                 errx(EX_DATAERR, "Incorrect mask");
2373                         bcopy(mac, mask, ETHER_ADDR_LEN);
2374                 }
2375         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2376                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2377                         mask[i] = 0xff;
2378         }
2379         for (i = 0; i < ETHER_ADDR_LEN; i++)
2380                 addr[i] &= mask[i];
2381
2382         free(optr);
2383 }
2384
2385 /*
2386  * helper function, updates the pointer to cmd with the length
2387  * of the current command, and also cleans up the first word of
2388  * the new command in case it has been clobbered before.
2389  */
2390 static ipfw_insn *
2391 next_cmd(ipfw_insn *cmd)
2392 {
2393         cmd += F_LEN(cmd);
2394         bzero(cmd, sizeof(*cmd));
2395         return cmd;
2396 }
2397
2398 /*
2399  * Takes arguments and copies them into a comment
2400  */
2401 static void
2402 fill_comment(ipfw_insn *cmd, char **av)
2403 {
2404         int i, l;
2405         char *p = (char *)(cmd + 1);
2406
2407         cmd->opcode = O_NOP;
2408         cmd->len =  (cmd->len & (F_NOT | F_OR));
2409
2410         /* Compute length of comment string. */
2411         for (i = 0, l = 0; av[i] != NULL; i++)
2412                 l += strlen(av[i]) + 1;
2413         if (l == 0)
2414                 return;
2415         if (l > 84)
2416                 errx(EX_DATAERR,
2417                     "comment too long (max 80 chars)");
2418         l = 1 + (l+3)/4;
2419         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2420         for (i = 0; av[i] != NULL; i++) {
2421                 strcpy(p, av[i]);
2422                 p += strlen(av[i]);
2423                 *p++ = ' ';
2424         }
2425         *(--p) = '\0';
2426 }
2427
2428 /*
2429  * A function to fill simple commands of size 1.
2430  * Existing flags are preserved.
2431  */
2432 static void
2433 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2434 {
2435         cmd->opcode = opcode;
2436         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2437         cmd->arg1 = arg;
2438 }
2439
2440 /*
2441  * Fetch and add the MAC address and type, with masks. This generates one or
2442  * two microinstructions, and returns the pointer to the last one.
2443  */
2444 static ipfw_insn *
2445 add_mac(ipfw_insn *cmd, char *av[])
2446 {
2447         ipfw_insn_mac *mac;
2448
2449         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2450                 errx(EX_DATAERR, "MAC dst src");
2451
2452         cmd->opcode = O_MACADDR2;
2453         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2454
2455         mac = (ipfw_insn_mac *)cmd;
2456         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2457         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2458             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2459         return cmd;
2460 }
2461
2462 static ipfw_insn *
2463 add_mactype(ipfw_insn *cmd, char *av)
2464 {
2465         if (!av)
2466                 errx(EX_DATAERR, "missing MAC type");
2467         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2468                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2469                 cmd->opcode = O_MAC_TYPE;
2470                 return cmd;
2471         } else
2472                 return NULL;
2473 }
2474
2475 static ipfw_insn *
2476 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2477 {
2478         struct protoent *pe;
2479         char *ep;
2480         int proto;
2481
2482         proto = strtol(av, &ep, 10);
2483         if (*ep != '\0' || proto <= 0) {
2484                 if ((pe = getprotobyname(av)) == NULL)
2485                         return NULL;
2486                 proto = pe->p_proto;
2487         }
2488
2489         fill_cmd(cmd, O_PROTO, 0, proto);
2490         *protop = proto;
2491         return cmd;
2492 }
2493
2494 static ipfw_insn *
2495 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2496 {
2497         u_char proto = IPPROTO_IP;
2498
2499         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2500                 ; /* do not set O_IP4 nor O_IP6 */
2501         else if (strcmp(av, "ip4") == 0)
2502                 /* explicit "just IPv4" rule */
2503                 fill_cmd(cmd, O_IP4, 0, 0);
2504         else if (strcmp(av, "ip6") == 0) {
2505                 /* explicit "just IPv6" rule */
2506                 proto = IPPROTO_IPV6;
2507                 fill_cmd(cmd, O_IP6, 0, 0);
2508         } else
2509                 return add_proto0(cmd, av, protop);
2510
2511         *protop = proto;
2512         return cmd;
2513 }
2514
2515 static ipfw_insn *
2516 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2517 {
2518         u_char proto = IPPROTO_IP;
2519
2520         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2521                 ; /* do not set O_IP4 nor O_IP6 */
2522         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2523                 /* explicit "just IPv4" rule */
2524                 fill_cmd(cmd, O_IP4, 0, 0);
2525         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2526                 /* explicit "just IPv6" rule */
2527                 proto = IPPROTO_IPV6;
2528                 fill_cmd(cmd, O_IP6, 0, 0);
2529         } else
2530                 return add_proto0(cmd, av, protop);
2531
2532         *protop = proto;
2533         return cmd;
2534 }
2535
2536 static ipfw_insn *
2537 add_srcip(ipfw_insn *cmd, char *av)
2538 {
2539         fill_ip((ipfw_insn_ip *)cmd, av);
2540         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2541                 cmd->opcode = O_IP_SRC_SET;
2542         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2543                 cmd->opcode = O_IP_SRC_LOOKUP;
2544         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2545                 cmd->opcode = O_IP_SRC_ME;
2546         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2547                 cmd->opcode = O_IP_SRC;
2548         else                                                    /* addr/mask */
2549                 cmd->opcode = O_IP_SRC_MASK;
2550         return cmd;
2551 }
2552
2553 static ipfw_insn *
2554 add_dstip(ipfw_insn *cmd, char *av)
2555 {
2556         fill_ip((ipfw_insn_ip *)cmd, av);
2557         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2558                 ;
2559         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2560                 ;
2561         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2562                 cmd->opcode = O_IP_DST_ME;
2563         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2564                 cmd->opcode = O_IP_DST;
2565         else                                                    /* addr/mask */
2566                 cmd->opcode = O_IP_DST_MASK;
2567         return cmd;
2568 }
2569
2570 static ipfw_insn *
2571 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2572 {
2573         /* XXX "any" is trapped before. Perhaps "to" */
2574         if (_substrcmp(av, "any") == 0) {
2575                 return NULL;
2576         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2577                 /* XXX todo: check that we have a protocol with ports */
2578                 cmd->opcode = opcode;
2579                 return cmd;
2580         }
2581         return NULL;
2582 }
2583
2584 static ipfw_insn *
2585 add_src(ipfw_insn *cmd, char *av, u_char proto)
2586 {
2587         struct in6_addr a;
2588         char *host, *ch;
2589         ipfw_insn *ret = NULL;
2590
2591         if ((host = strdup(av)) == NULL)
2592                 return NULL;
2593         if ((ch = strrchr(host, '/')) != NULL)
2594                 *ch = '\0';
2595
2596         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2597             inet_pton(AF_INET6, host, &a) == 1)
2598                 ret = add_srcip6(cmd, av);
2599         /* XXX: should check for IPv4, not !IPv6 */
2600         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2601             inet_pton(AF_INET6, host, &a) != 1))
2602                 ret = add_srcip(cmd, av);
2603         if (ret == NULL && strcmp(av, "any") != 0)
2604                 ret = cmd;
2605
2606         free(host);
2607         return ret;
2608 }
2609
2610 static ipfw_insn *
2611 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2612 {
2613         struct in6_addr a;
2614         char *host, *ch;
2615         ipfw_insn *ret = NULL;
2616
2617         if ((host = strdup(av)) == NULL)
2618                 return NULL;
2619         if ((ch = strrchr(host, '/')) != NULL)
2620                 *ch = '\0';
2621
2622         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2623             inet_pton(AF_INET6, host, &a) == 1)
2624                 ret = add_dstip6(cmd, av);
2625         /* XXX: should check for IPv4, not !IPv6 */
2626         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2627             inet_pton(AF_INET6, host, &a) != 1))
2628                 ret = add_dstip(cmd, av);
2629         if (ret == NULL && strcmp(av, "any") != 0)
2630                 ret = cmd;
2631
2632         free(host);
2633         return ret;
2634 }
2635
2636 /*
2637  * Parse arguments and assemble the microinstructions which make up a rule.
2638  * Rules are added into the 'rulebuf' and then copied in the correct order
2639  * into the actual rule.
2640  *
2641  * The syntax for a rule starts with the action, followed by
2642  * optional action parameters, and the various match patterns.
2643  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2644  * (generated if the rule includes a keep-state option), then the
2645  * various match patterns, log/altq actions, and the actual action.
2646  *
2647  */
2648 void
2649 ipfw_add(char *av[])
2650 {
2651         /*
2652          * rules are added into the 'rulebuf' and then copied in
2653          * the correct order into the actual rule.
2654          * Some things that need to go out of order (prob, action etc.)
2655          * go into actbuf[].
2656          */
2657         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2658
2659         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2660         ipfw_insn *first_cmd;   /* first match pattern */
2661
2662         struct ip_fw *rule;
2663
2664         /*
2665          * various flags used to record that we entered some fields.
2666          */
2667         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2668         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2669         size_t len;
2670
2671         int i;
2672
2673         int open_par = 0;       /* open parenthesis ( */
2674
2675         /* proto is here because it is used to fetch ports */
2676         u_char proto = IPPROTO_IP;      /* default protocol */
2677
2678         double match_prob = 1; /* match probability, default is always match */
2679
2680         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2681         bzero(cmdbuf, sizeof(cmdbuf));
2682         bzero(rulebuf, sizeof(rulebuf));
2683
2684         rule = (struct ip_fw *)rulebuf;
2685         cmd = (ipfw_insn *)cmdbuf;
2686         action = (ipfw_insn *)actbuf;
2687
2688         av++;
2689
2690         /* [rule N]     -- Rule number optional */
2691         if (av[0] && isdigit(**av)) {
2692                 rule->rulenum = atoi(*av);
2693                 av++;
2694         }
2695
2696         /* [set N]      -- set number (0..RESVD_SET), optional */
2697         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2698                 int set = strtoul(av[1], NULL, 10);
2699                 if (set < 0 || set > RESVD_SET)
2700                         errx(EX_DATAERR, "illegal set %s", av[1]);
2701                 rule->set = set;
2702                 av += 2;
2703         }
2704
2705         /* [prob D]     -- match probability, optional */
2706         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2707                 match_prob = strtod(av[1], NULL);
2708
2709                 if (match_prob <= 0 || match_prob > 1)
2710                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2711                 av += 2;
2712         }
2713
2714         /* action       -- mandatory */
2715         NEED1("missing action");
2716         i = match_token(rule_actions, *av);
2717         av++;
2718         action->len = 1;        /* default */
2719         switch(i) {
2720         case TOK_CHECKSTATE:
2721                 have_state = action;
2722                 action->opcode = O_CHECK_STATE;
2723                 break;
2724
2725         case TOK_ACCEPT:
2726                 action->opcode = O_ACCEPT;
2727                 break;
2728
2729         case TOK_DENY:
2730                 action->opcode = O_DENY;
2731                 action->arg1 = 0;
2732                 break;
2733
2734         case TOK_REJECT:
2735                 action->opcode = O_REJECT;
2736                 action->arg1 = ICMP_UNREACH_HOST;
2737                 break;
2738
2739         case TOK_RESET:
2740                 action->opcode = O_REJECT;
2741                 action->arg1 = ICMP_REJECT_RST;
2742                 break;
2743
2744         case TOK_RESET6:
2745                 action->opcode = O_UNREACH6;
2746                 action->arg1 = ICMP6_UNREACH_RST;
2747                 break;
2748
2749         case TOK_UNREACH:
2750                 action->opcode = O_REJECT;
2751                 NEED1("missing reject code");
2752                 fill_reject_code(&action->arg1, *av);
2753                 av++;
2754                 break;
2755
2756         case TOK_UNREACH6:
2757                 action->opcode = O_UNREACH6;
2758                 NEED1("missing unreach code");
2759                 fill_unreach6_code(&action->arg1, *av);
2760                 av++;
2761                 break;
2762
2763         case TOK_COUNT:
2764                 action->opcode = O_COUNT;
2765                 break;
2766
2767         case TOK_NAT:
2768                 action->opcode = O_NAT;
2769                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2770                 if (_substrcmp(*av, "global") == 0) {
2771                         action->arg1 = 0;
2772                         av++;
2773                         break;
2774                 } else
2775                         goto chkarg;
2776
2777         case TOK_QUEUE:
2778                 action->opcode = O_QUEUE;
2779                 goto chkarg;
2780         case TOK_PIPE:
2781                 action->opcode = O_PIPE;
2782                 goto chkarg;
2783         case TOK_SKIPTO:
2784                 action->opcode = O_SKIPTO;
2785                 goto chkarg;
2786         case TOK_NETGRAPH:
2787                 action->opcode = O_NETGRAPH;
2788                 goto chkarg;
2789         case TOK_NGTEE:
2790                 action->opcode = O_NGTEE;
2791                 goto chkarg;
2792         case TOK_DIVERT:
2793                 action->opcode = O_DIVERT;
2794                 goto chkarg;
2795         case TOK_TEE:
2796                 action->opcode = O_TEE;
2797                 goto chkarg;
2798         case TOK_CALL:
2799                 action->opcode = O_CALLRETURN;
2800 chkarg:
2801                 if (!av[0])
2802                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2803                 if (isdigit(**av)) {
2804                         action->arg1 = strtoul(*av, NULL, 10);
2805                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2806                                 errx(EX_DATAERR, "illegal argument for %s",
2807                                     *(av - 1));
2808                 } else if (_substrcmp(*av, "tablearg") == 0) {
2809                         action->arg1 = IP_FW_TABLEARG;
2810                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2811                         struct servent *s;
2812                         setservent(1);
2813                         s = getservbyname(av[0], "divert");
2814                         if (s != NULL)
2815                                 action->arg1 = ntohs(s->s_port);
2816                         else
2817                                 errx(EX_DATAERR, "illegal divert/tee port");
2818                 } else
2819                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2820                 av++;
2821                 break;
2822
2823         case TOK_FORWARD: {
2824                 /*
2825                  * Locate the address-port separator (':' or ',').
2826                  * Could be one of the following:
2827                  *      hostname:port
2828                  *      IPv4 a.b.c.d,port
2829                  *      IPv4 a.b.c.d:port
2830                  *      IPv6 w:x:y::z,port
2831                  * The ':' can only be used with hostname and IPv4 address.
2832                  * XXX-BZ Should we also support [w:x:y::z]:port?
2833                  */
2834                 struct sockaddr_storage result;
2835                 struct addrinfo *res;
2836                 char *s, *end;
2837                 int family;
2838                 u_short port_number;
2839
2840                 NEED1("missing forward address[:port]");
2841
2842                 /*
2843                  * locate the address-port separator (':' or ',')
2844                  */
2845                 s = strchr(*av, ',');
2846                 if (s == NULL) {
2847                         /* Distinguish between IPv4:port and IPv6 cases. */
2848                         s = strchr(*av, ':');
2849                         if (s && strchr(s+1, ':'))
2850                                 s = NULL; /* no port */
2851                 }
2852
2853                 port_number = 0;
2854                 if (s != NULL) {
2855                         /* Terminate host portion and set s to start of port. */
2856                         *(s++) = '\0';
2857                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2858                         if (s == end)
2859                                 errx(EX_DATAERR,
2860                                     "illegal forwarding port ``%s''", s);
2861                         port_number = (u_short)i;
2862                 }
2863
2864                 if (_substrcmp(*av, "tablearg") == 0) {
2865                         family = PF_INET;
2866                         ((struct sockaddr_in*)&result)->sin_addr.s_addr =
2867                             INADDR_ANY;
2868                 } else {
2869                         /*
2870                          * Resolve the host name or address to a family and a
2871                          * network representation of the addres.
2872                          */
2873                         if (getaddrinfo(*av, NULL, NULL, &res))
2874                                 errx(EX_DATAERR, NULL);
2875                         /* Just use the first host in the answer. */
2876                         family = res->ai_family;
2877                         memcpy(&result, res->ai_addr, res->ai_addrlen);
2878                         freeaddrinfo(res);
2879                 }
2880
2881                 if (family == PF_INET) {
2882                         ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2883
2884                         action->opcode = O_FORWARD_IP;
2885                         action->len = F_INSN_SIZE(ipfw_insn_sa);
2886
2887                         /*
2888                          * In the kernel we assume AF_INET and use only
2889                          * sin_port and sin_addr. Remember to set sin_len as
2890                          * the routing code seems to use it too.
2891                          */
2892                         p->sa.sin_len = sizeof(struct sockaddr_in);
2893                         p->sa.sin_family = AF_INET;
2894                         p->sa.sin_port = port_number;
2895                         p->sa.sin_addr.s_addr =
2896                              ((struct sockaddr_in *)&result)->sin_addr.s_addr;
2897                 } else if (family == PF_INET6) {
2898                         ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
2899
2900                         action->opcode = O_FORWARD_IP6;
2901                         action->len = F_INSN_SIZE(ipfw_insn_sa6);
2902
2903                         p->sa.sin6_len = sizeof(struct sockaddr_in6);
2904                         p->sa.sin6_family = AF_INET6;
2905                         p->sa.sin6_port = port_number;
2906                         p->sa.sin6_flowinfo = 0;
2907                         p->sa.sin6_scope_id = 0;
2908                         /* No table support for v6 yet. */
2909                         bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
2910                             &p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
2911                 } else {
2912                         errx(EX_DATAERR, "Invalid address family in forward action");
2913                 }
2914                 av++;
2915                 break;
2916             }
2917         case TOK_COMMENT:
2918                 /* pretend it is a 'count' rule followed by the comment */
2919                 action->opcode = O_COUNT;
2920                 av--;           /* go back... */
2921                 break;
2922
2923         case TOK_SETFIB:
2924             {
2925                 int numfibs;
2926                 size_t intsize = sizeof(int);
2927
2928                 action->opcode = O_SETFIB;
2929                 NEED1("missing fib number");
2930                 if (_substrcmp(*av, "tablearg") == 0) {
2931                         action->arg1 = IP_FW_TABLEARG;
2932                 } else {
2933                         action->arg1 = strtoul(*av, NULL, 10);
2934                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
2935                             NULL, 0) == -1)
2936                                 errx(EX_DATAERR, "fibs not suported.\n");
2937                         if (action->arg1 >= numfibs)  /* Temporary */
2938                                 errx(EX_DATAERR, "fib too large.\n");
2939                 }
2940                 av++;
2941                 break;
2942             }
2943
2944         case TOK_REASS:
2945                 action->opcode = O_REASS;
2946                 break;
2947
2948         case TOK_RETURN:
2949                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
2950                 break;
2951
2952         default:
2953                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2954         }
2955         action = next_cmd(action);
2956
2957         /*
2958          * [altq queuename] -- altq tag, optional
2959          * [log [logamount N]]  -- log, optional
2960          *
2961          * If they exist, it go first in the cmdbuf, but then it is
2962          * skipped in the copy section to the end of the buffer.
2963          */
2964         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
2965                 av++;
2966                 switch (i) {
2967                 case TOK_LOG:
2968                     {
2969                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2970                         int l;
2971
2972                         if (have_log)
2973                                 errx(EX_DATAERR,
2974                                     "log cannot be specified more than once");
2975                         have_log = (ipfw_insn *)c;
2976                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2977                         cmd->opcode = O_LOG;
2978                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
2979                                 av++;
2980                                 NEED1("logamount requires argument");
2981                                 l = atoi(*av);
2982                                 if (l < 0)
2983                                         errx(EX_DATAERR,
2984                                             "logamount must be positive");
2985                                 c->max_log = l;
2986                                 av++;
2987                         } else {
2988                                 len = sizeof(c->max_log);
2989                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2990                                     &c->max_log, &len, NULL, 0) == -1)
2991                                         errx(1, "sysctlbyname(\"%s\")",
2992                                             "net.inet.ip.fw.verbose_limit");
2993                         }
2994                     }
2995                         break;
2996
2997 #ifndef NO_ALTQ
2998                 case TOK_ALTQ:
2999                     {
3000                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
3001
3002                         NEED1("missing altq queue name");
3003                         if (have_altq)
3004                                 errx(EX_DATAERR,
3005                                     "altq cannot be specified more than once");
3006                         have_altq = (ipfw_insn *)a;
3007                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
3008                         cmd->opcode = O_ALTQ;
3009                         a->qid = altq_name_to_qid(*av);
3010                         av++;
3011                     }
3012                         break;
3013 #endif
3014
3015                 case TOK_TAG:
3016                 case TOK_UNTAG: {
3017                         uint16_t tag;
3018
3019                         if (have_tag)
3020                                 errx(EX_USAGE, "tag and untag cannot be "
3021                                     "specified more than once");
3022                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
3023                            rule_action_params);
3024                         have_tag = cmd;
3025                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
3026                         av++;
3027                         break;
3028                 }
3029
3030                 default:
3031                         abort();
3032                 }
3033                 cmd = next_cmd(cmd);
3034         }
3035
3036         if (have_state) /* must be a check-state, we are done */
3037                 goto done;
3038
3039 #define OR_START(target)                                        \
3040         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
3041                 if (open_par)                                   \
3042                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
3043                 prev = NULL;                                    \
3044                 open_par = 1;                                   \
3045                 if ( (av[0])[1] == '\0') {                      \
3046                         av++;                                   \
3047                 } else                                          \
3048                         (*av)++;                                \
3049         }                                                       \
3050         target:                                                 \
3051
3052
3053 #define CLOSE_PAR                                               \
3054         if (open_par) {                                         \
3055                 if (av[0] && (                                  \
3056                     strcmp(*av, ")") == 0 ||                    \
3057                     strcmp(*av, "}") == 0)) {                   \
3058                         prev = NULL;                            \
3059                         open_par = 0;                           \
3060                         av++;                                   \
3061                 } else                                          \
3062                         errx(EX_USAGE, "missing \")\"\n");      \
3063         }
3064
3065 #define NOT_BLOCK                                               \
3066         if (av[0] && _substrcmp(*av, "not") == 0) {             \
3067                 if (cmd->len & F_NOT)                           \
3068                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3069                 cmd->len |= F_NOT;                              \
3070                 av++;                                           \
3071         }
3072
3073 #define OR_BLOCK(target)                                        \
3074         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3075                 if (prev == NULL || open_par == 0)              \
3076                         errx(EX_DATAERR, "invalid OR block");   \
3077                 prev->len |= F_OR;                              \
3078                 av++;                                   \
3079                 goto target;                                    \
3080         }                                                       \
3081         CLOSE_PAR;
3082
3083         first_cmd = cmd;
3084
3085 #if 0
3086         /*
3087          * MAC addresses, optional.
3088          * If we have this, we skip the part "proto from src to dst"
3089          * and jump straight to the option parsing.
3090          */
3091         NOT_BLOCK;
3092         NEED1("missing protocol");
3093         if (_substrcmp(*av, "MAC") == 0 ||
3094             _substrcmp(*av, "mac") == 0) {
3095                 av++;                   /* the "MAC" keyword */
3096                 add_mac(cmd, av);       /* exits in case of errors */
3097                 cmd = next_cmd(cmd);
3098                 av += 2;                /* dst-mac and src-mac */
3099                 NOT_BLOCK;
3100                 NEED1("missing mac type");
3101                 if (add_mactype(cmd, av[0]))
3102                         cmd = next_cmd(cmd);
3103                 av++;                   /* any or mac-type */
3104                 goto read_options;
3105         }
3106 #endif
3107
3108         /*
3109          * protocol, mandatory
3110          */
3111     OR_START(get_proto);
3112         NOT_BLOCK;
3113         NEED1("missing protocol");
3114         if (add_proto_compat(cmd, *av, &proto)) {
3115                 av++;
3116                 if (F_LEN(cmd) != 0) {
3117                         prev = cmd;
3118                         cmd = next_cmd(cmd);
3119                 }
3120         } else if (first_cmd != cmd) {
3121                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3122         } else
3123                 goto read_options;
3124     OR_BLOCK(get_proto);
3125
3126         /*
3127          * "from", mandatory
3128          */
3129         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3130                 errx(EX_USAGE, "missing ``from''");
3131         av++;
3132
3133         /*
3134          * source IP, mandatory
3135          */
3136     OR_START(source_ip);
3137         NOT_BLOCK;      /* optional "not" */
3138         NEED1("missing source address");
3139         if (add_src(cmd, *av, proto)) {
3140                 av++;
3141                 if (F_LEN(cmd) != 0) {  /* ! any */
3142                         prev = cmd;
3143                         cmd = next_cmd(cmd);
3144                 }
3145         } else
3146                 errx(EX_USAGE, "bad source address %s", *av);
3147     OR_BLOCK(source_ip);
3148
3149         /*
3150          * source ports, optional
3151          */
3152         NOT_BLOCK;      /* optional "not" */
3153         if ( av[0] != NULL ) {
3154                 if (_substrcmp(*av, "any") == 0 ||
3155                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3156                         av++;
3157                         if (F_LEN(cmd) != 0)
3158                                 cmd = next_cmd(cmd);
3159                 }
3160         }
3161
3162         /*
3163          * "to", mandatory
3164          */
3165         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3166                 errx(EX_USAGE, "missing ``to''");
3167         av++;
3168
3169         /*
3170          * destination, mandatory
3171          */
3172     OR_START(dest_ip);
3173         NOT_BLOCK;      /* optional "not" */
3174         NEED1("missing dst address");
3175         if (add_dst(cmd, *av, proto)) {
3176                 av++;
3177                 if (F_LEN(cmd) != 0) {  /* ! any */
3178                         prev = cmd;
3179                         cmd = next_cmd(cmd);
3180                 }
3181         } else
3182                 errx( EX_USAGE, "bad destination address %s", *av);
3183     OR_BLOCK(dest_ip);
3184
3185         /*
3186          * dest. ports, optional
3187          */
3188         NOT_BLOCK;      /* optional "not" */
3189         if (av[0]) {
3190                 if (_substrcmp(*av, "any") == 0 ||
3191                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3192                         av++;
3193                         if (F_LEN(cmd) != 0)
3194                                 cmd = next_cmd(cmd);
3195                 }
3196         }
3197
3198 read_options:
3199         if (av[0] && first_cmd == cmd) {
3200                 /*
3201                  * nothing specified so far, store in the rule to ease
3202                  * printout later.
3203                  */
3204                  rule->_pad = 1;
3205         }
3206         prev = NULL;
3207         while ( av[0] != NULL ) {
3208                 char *s;
3209                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3210
3211                 s = *av;
3212                 cmd32 = (ipfw_insn_u32 *)cmd;
3213
3214                 if (*s == '!') {        /* alternate syntax for NOT */
3215                         if (cmd->len & F_NOT)
3216                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3217                         cmd->len = F_NOT;
3218                         s++;
3219                 }
3220                 i = match_token(rule_options, s);
3221                 av++;
3222                 switch(i) {
3223                 case TOK_NOT:
3224                         if (cmd->len & F_NOT)
3225                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3226                         cmd->len = F_NOT;
3227                         break;
3228
3229                 case TOK_OR:
3230                         if (open_par == 0 || prev == NULL)
3231                                 errx(EX_USAGE, "invalid \"or\" block\n");
3232                         prev->len |= F_OR;
3233                         break;
3234
3235                 case TOK_STARTBRACE:
3236                         if (open_par)
3237                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3238                         open_par = 1;
3239                         break;
3240
3241                 case TOK_ENDBRACE:
3242                         if (!open_par)
3243                                 errx(EX_USAGE, "+missing \")\"\n");
3244                         open_par = 0;
3245                         prev = NULL;
3246                         break;
3247
3248                 case TOK_IN:
3249                         fill_cmd(cmd, O_IN, 0, 0);
3250                         break;
3251
3252                 case TOK_OUT:
3253                         cmd->len ^= F_NOT; /* toggle F_NOT */
3254                         fill_cmd(cmd, O_IN, 0, 0);
3255                         break;
3256
3257                 case TOK_DIVERTED:
3258                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3259                         break;
3260
3261                 case TOK_DIVERTEDLOOPBACK:
3262                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3263                         break;
3264
3265                 case TOK_DIVERTEDOUTPUT:
3266                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3267                         break;
3268
3269                 case TOK_FRAG:
3270                         fill_cmd(cmd, O_FRAG, 0, 0);
3271                         break;
3272
3273                 case TOK_LAYER2:
3274                         fill_cmd(cmd, O_LAYER2, 0, 0);
3275                         break;
3276
3277                 case TOK_XMIT:
3278                 case TOK_RECV:
3279                 case TOK_VIA:
3280                         NEED1("recv, xmit, via require interface name"
3281                                 " or address");
3282                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3283                         av++;
3284                         if (F_LEN(cmd) == 0)    /* not a valid address */
3285                                 break;
3286                         if (i == TOK_XMIT)
3287                                 cmd->opcode = O_XMIT;
3288                         else if (i == TOK_RECV)
3289                                 cmd->opcode = O_RECV;
3290                         else if (i == TOK_VIA)
3291                                 cmd->opcode = O_VIA;
3292                         break;
3293
3294                 case TOK_ICMPTYPES:
3295                         NEED1("icmptypes requires list of types");
3296                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3297                         av++;
3298                         break;
3299
3300                 case TOK_ICMP6TYPES:
3301                         NEED1("icmptypes requires list of types");
3302                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3303                         av++;
3304                         break;
3305
3306                 case TOK_IPTTL:
3307                         NEED1("ipttl requires TTL");
3308                         if (strpbrk(*av, "-,")) {
3309                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3310                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3311                         } else
3312                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3313                         av++;
3314                         break;
3315
3316                 case TOK_IPID:
3317                         NEED1("ipid requires id");
3318                         if (strpbrk(*av, "-,")) {
3319                             if (!add_ports(cmd, *av, 0, O_IPID))
3320                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3321                         } else
3322                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3323                         av++;
3324                         break;
3325
3326                 case TOK_IPLEN:
3327                         NEED1("iplen requires length");
3328                         if (strpbrk(*av, "-,")) {
3329                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3330                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3331                         } else
3332                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3333                         av++;
3334                         break;
3335
3336                 case TOK_IPVER:
3337                         NEED1("ipver requires version");
3338                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3339                         av++;
3340                         break;
3341
3342                 case TOK_IPPRECEDENCE:
3343                         NEED1("ipprecedence requires value");
3344                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3345                             (strtoul(*av, NULL, 0) & 7) << 5);
3346                         av++;
3347                         break;
3348
3349                 case TOK_IPOPTS:
3350                         NEED1("missing argument for ipoptions");
3351                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3352                         av++;
3353                         break;
3354
3355                 case TOK_IPTOS:
3356                         NEED1("missing argument for iptos");
3357                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3358                         av++;
3359                         break;
3360
3361                 case TOK_UID:
3362                         NEED1("uid requires argument");
3363                     {
3364                         char *end;
3365                         uid_t uid;
3366                         struct passwd *pwd;
3367
3368                         cmd->opcode = O_UID;
3369                         uid = strtoul(*av, &end, 0);
3370                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3371                         if (pwd == NULL)
3372                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3373                         cmd32->d[0] = pwd->pw_uid;
3374                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3375                         av++;
3376                     }
3377                         break;
3378
3379                 case TOK_GID:
3380                         NEED1("gid requires argument");
3381                     {
3382                         char *end;
3383                         gid_t gid;
3384                         struct group *grp;
3385
3386                         cmd->opcode = O_GID;
3387                         gid = strtoul(*av, &end, 0);
3388                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3389                         if (grp == NULL)
3390                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3391                         cmd32->d[0] = grp->gr_gid;
3392                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3393                         av++;
3394                     }
3395                         break;
3396
3397                 case TOK_JAIL:
3398                         NEED1("jail requires argument");
3399                     {
3400                         char *end;
3401                         int jid;
3402
3403                         cmd->opcode = O_JAIL;
3404                         jid = (int)strtol(*av, &end, 0);
3405                         if (jid < 0 || *end != '\0')
3406                                 errx(EX_DATAERR, "jail requires prison ID");
3407                         cmd32->d[0] = (uint32_t)jid;
3408                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3409                         av++;
3410                     }
3411                         break;
3412
3413                 case TOK_ESTAB:
3414                         fill_cmd(cmd, O_ESTAB, 0, 0);
3415                         break;
3416
3417                 case TOK_SETUP:
3418                         fill_cmd(cmd, O_TCPFLAGS, 0,
3419                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3420                         break;
3421
3422                 case TOK_TCPDATALEN:
3423                         NEED1("tcpdatalen requires length");
3424                         if (strpbrk(*av, "-,")) {
3425                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3426                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3427                         } else
3428                             fill_cmd(cmd, O_TCPDATALEN, 0,
3429                                     strtoul(*av, NULL, 0));
3430                         av++;
3431                         break;
3432
3433                 case TOK_TCPOPTS:
3434                         NEED1("missing argument for tcpoptions");
3435                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3436                         av++;
3437                         break;
3438
3439                 case TOK_TCPSEQ:
3440                 case TOK_TCPACK:
3441                         NEED1("tcpseq/tcpack requires argument");
3442                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3443                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3444                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3445                         av++;
3446                         break;
3447
3448                 case TOK_TCPWIN:
3449                         NEED1("tcpwin requires length");
3450                         fill_cmd(cmd, O_TCPWIN, 0,
3451                             htons(strtoul(*av, NULL, 0)));
3452                         av++;
3453                         break;
3454
3455                 case TOK_TCPFLAGS:
3456                         NEED1("missing argument for tcpflags");
3457                         cmd->opcode = O_TCPFLAGS;
3458                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3459                         av++;
3460                         break;
3461
3462                 case TOK_KEEPSTATE:
3463                         if (open_par)
3464                                 errx(EX_USAGE, "keep-state cannot be part "
3465                                     "of an or block");
3466                         if (have_state)
3467                                 errx(EX_USAGE, "only one of keep-state "
3468                                         "and limit is allowed");
3469                         have_state = cmd;
3470                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3471                         break;
3472
3473                 case TOK_LIMIT: {
3474                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3475                         int val;
3476
3477                         if (open_par)
3478                                 errx(EX_USAGE,
3479                                     "limit cannot be part of an or block");
3480                         if (have_state)
3481                                 errx(EX_USAGE, "only one of keep-state and "
3482                                     "limit is allowed");
3483                         have_state = cmd;
3484
3485                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3486                         cmd->opcode = O_LIMIT;
3487                         c->limit_mask = c->conn_limit = 0;
3488
3489                         while ( av[0] != NULL ) {
3490                                 if ((val = match_token(limit_masks, *av)) <= 0)
3491                                         break;
3492                                 c->limit_mask |= val;
3493                                 av++;
3494                         }
3495
3496                         if (c->limit_mask == 0)
3497                                 errx(EX_USAGE, "limit: missing limit mask");
3498
3499                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3500                             TOK_LIMIT, rule_options);
3501
3502                         av++;
3503                         break;
3504                 }
3505
3506                 case TOK_PROTO:
3507                         NEED1("missing protocol");
3508                         if (add_proto(cmd, *av, &proto)) {
3509                                 av++;
3510                         } else
3511                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3512                                     *av);
3513                         break;
3514
3515                 case TOK_SRCIP:
3516                         NEED1("missing source IP");
3517                         if (add_srcip(cmd, *av)) {
3518                                 av++;
3519                         }
3520                         break;
3521
3522                 case TOK_DSTIP:
3523                         NEED1("missing destination IP");
3524                         if (add_dstip(cmd, *av)) {
3525                                 av++;
3526                         }
3527                         break;
3528
3529                 case TOK_SRCIP6:
3530                         NEED1("missing source IP6");
3531                         if (add_srcip6(cmd, *av)) {
3532                                 av++;
3533                         }
3534                         break;
3535
3536                 case TOK_DSTIP6:
3537                         NEED1("missing destination IP6");
3538                         if (add_dstip6(cmd, *av)) {
3539                                 av++;
3540                         }
3541                         break;
3542
3543                 case TOK_SRCPORT:
3544                         NEED1("missing source port");
3545                         if (_substrcmp(*av, "any") == 0 ||
3546                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3547                                 av++;
3548                         } else
3549                                 errx(EX_DATAERR, "invalid source port %s", *av);
3550                         break;
3551
3552                 case TOK_DSTPORT:
3553                         NEED1("missing destination port");
3554                         if (_substrcmp(*av, "any") == 0 ||
3555                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3556                                 av++;
3557                         } else
3558                                 errx(EX_DATAERR, "invalid destination port %s",
3559                                     *av);
3560                         break;
3561
3562                 case TOK_MAC:
3563                         if (add_mac(cmd, av))
3564                                 av += 2;
3565                         break;
3566
3567                 case TOK_MACTYPE:
3568                         NEED1("missing mac type");
3569                         if (!add_mactype(cmd, *av))
3570                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3571                         av++;
3572                         break;
3573
3574                 case TOK_VERREVPATH:
3575                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3576                         break;
3577
3578                 case TOK_VERSRCREACH:
3579                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3580                         break;
3581
3582                 case TOK_ANTISPOOF:
3583                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3584                         break;
3585
3586                 case TOK_IPSEC:
3587                         fill_cmd(cmd, O_IPSEC, 0, 0);
3588                         break;
3589
3590                 case TOK_IPV6:
3591                         fill_cmd(cmd, O_IP6, 0, 0);
3592                         break;
3593
3594                 case TOK_IPV4:
3595                         fill_cmd(cmd, O_IP4, 0, 0);
3596                         break;
3597
3598                 case TOK_EXT6HDR:
3599                         fill_ext6hdr( cmd, *av );
3600                         av++;
3601                         break;
3602
3603                 case TOK_FLOWID:
3604                         if (proto != IPPROTO_IPV6 )
3605                                 errx( EX_USAGE, "flow-id filter is active "
3606                                     "only for ipv6 protocol\n");
3607                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3608                         av++;
3609                         break;
3610
3611                 case TOK_COMMENT:
3612                         fill_comment(cmd, av);
3613                         av[0]=NULL;
3614                         break;
3615
3616                 case TOK_TAGGED:
3617                         if (av[0] && strpbrk(*av, "-,")) {
3618                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3619                                         errx(EX_DATAERR, "tagged: invalid tag"
3620                                             " list: %s", *av);
3621                         }
3622                         else {
3623                                 uint16_t tag;
3624
3625                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3626                                     TOK_TAGGED, rule_options);
3627                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3628                         }
3629                         av++;
3630                         break;
3631
3632                 case TOK_FIB:
3633                         NEED1("fib requires fib number");
3634                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3635                         av++;
3636                         break;
3637                 case TOK_SOCKARG:
3638                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3639                         break;
3640
3641                 case TOK_LOOKUP: {
3642                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3643                         char *p;
3644                         int j;
3645
3646                         if (!av[0] || !av[1])
3647                                 errx(EX_USAGE, "format: lookup argument tablenum");
3648                         cmd->opcode = O_IP_DST_LOOKUP;
3649                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3650                         i = match_token(rule_options, *av);
3651                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3652                                 if (i == lookup_key[j])
3653                                         break;
3654                         }
3655                         if (lookup_key[j] <= 0)
3656                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3657                         __PAST_END(c->d, 1) = j; // i converted to option
3658                         av++;
3659                         cmd->arg1 = strtoul(*av, &p, 0);
3660                         if (p && *p)
3661                                 errx(EX_USAGE, "format: lookup argument tablenum");
3662                         av++;
3663                     }
3664                         break;
3665
3666                 default:
3667                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3668                 }
3669                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3670                         prev = cmd;
3671                         cmd = next_cmd(cmd);
3672                 }
3673         }
3674
3675 done:
3676         /*
3677          * Now copy stuff into the rule.
3678          * If we have a keep-state option, the first instruction
3679          * must be a PROBE_STATE (which is generated here).
3680          * If we have a LOG option, it was stored as the first command,
3681          * and now must be moved to the top of the action part.
3682          */
3683         dst = (ipfw_insn *)rule->cmd;
3684
3685         /*
3686          * First thing to write into the command stream is the match probability.
3687          */
3688         if (match_prob != 1) { /* 1 means always match */
3689                 dst->opcode = O_PROB;
3690                 dst->len = 2;
3691                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3692                 dst += dst->len;
3693         }
3694
3695         /*
3696          * generate O_PROBE_STATE if necessary
3697          */
3698         if (have_state && have_state->opcode != O_CHECK_STATE) {
3699                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3700                 dst = next_cmd(dst);
3701         }
3702
3703         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3704         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3705                 i = F_LEN(src);
3706
3707                 switch (src->opcode) {
3708                 case O_LOG:
3709                 case O_KEEP_STATE:
3710                 case O_LIMIT:
3711                 case O_ALTQ:
3712                 case O_TAG:
3713                         break;
3714                 default:
3715                         bcopy(src, dst, i * sizeof(uint32_t));
3716                         dst += i;
3717                 }
3718         }
3719
3720         /*
3721          * put back the have_state command as last opcode
3722          */
3723         if (have_state && have_state->opcode != O_CHECK_STATE) {
3724                 i = F_LEN(have_state);
3725                 bcopy(have_state, dst, i * sizeof(uint32_t));
3726                 dst += i;
3727         }
3728         /*
3729          * start action section
3730          */
3731         rule->act_ofs = dst - rule->cmd;
3732
3733         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3734         if (have_log) {
3735                 i = F_LEN(have_log);
3736                 bcopy(have_log, dst, i * sizeof(uint32_t));
3737                 dst += i;
3738         }
3739         if (have_altq) {
3740                 i = F_LEN(have_altq);
3741                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3742                 dst += i;
3743         }
3744         if (have_tag) {
3745                 i = F_LEN(have_tag);
3746                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3747                 dst += i;
3748         }
3749         /*
3750          * copy all other actions
3751          */
3752         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3753                 i = F_LEN(src);
3754                 bcopy(src, dst, i * sizeof(uint32_t));
3755                 dst += i;
3756         }
3757
3758         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3759         i = (char *)dst - (char *)rule;
3760         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3761                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3762         if (!co.do_quiet)
3763                 show_ipfw(rule, 0, 0);
3764 }
3765
3766 /*
3767  * clear the counters or the log counters.
3768  */
3769 void
3770 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3771 {
3772         uint32_t arg, saved_arg;
3773         int failed = EX_OK;
3774         char const *errstr;
3775         char const *name = optname ? "RESETLOG" : "ZERO";
3776
3777         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3778
3779         av++; ac--;
3780
3781         if (!ac) {
3782                 /* clear all entries */
3783                 if (do_cmd(optname, NULL, 0) < 0)
3784                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3785                 if (!co.do_quiet)
3786                         printf("%s.\n", optname == IP_FW_ZERO ?
3787                             "Accounting cleared":"Logging counts reset");
3788
3789                 return;
3790         }
3791
3792         while (ac) {
3793                 /* Rule number */
3794                 if (isdigit(**av)) {
3795                         arg = strtonum(*av, 0, 0xffff, &errstr);
3796                         if (errstr)
3797                                 errx(EX_DATAERR,
3798                                     "invalid rule number %s\n", *av);
3799                         saved_arg = arg;
3800                         if (co.use_set)
3801                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3802                         av++;
3803                         ac--;
3804                         if (do_cmd(optname, &arg, sizeof(arg))) {
3805                                 warn("rule %u: setsockopt(IP_FW_%s)",
3806                                     saved_arg, name);
3807                                 failed = EX_UNAVAILABLE;
3808                         } else if (!co.do_quiet)
3809                                 printf("Entry %d %s.\n", saved_arg,
3810                                     optname == IP_FW_ZERO ?
3811                                         "cleared" : "logging count reset");
3812                 } else {
3813                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3814                 }
3815         }
3816         if (failed != EX_OK)
3817                 exit(failed);
3818 }
3819
3820 void
3821 ipfw_flush(int force)
3822 {
3823         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3824
3825         if (!force && !co.do_quiet) { /* need to ask user */
3826                 int c;
3827
3828                 printf("Are you sure? [yn] ");
3829                 fflush(stdout);
3830                 do {
3831                         c = toupper(getc(stdin));
3832                         while (c != '\n' && getc(stdin) != '\n')
3833                                 if (feof(stdin))
3834                                         return; /* and do not flush */
3835                 } while (c != 'Y' && c != 'N');
3836                 printf("\n");
3837                 if (c == 'N')   /* user said no */
3838                         return;
3839         }
3840         if (co.do_pipe) {
3841                 dummynet_flush();
3842                 return;
3843         }
3844         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3845         if (co.use_set) {
3846                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3847                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3848                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3849         } else if (do_cmd(cmd, NULL, 0) < 0)
3850                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3851                     co.do_pipe ? "DUMMYNET" : "FW");
3852         if (!co.do_quiet)
3853                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3854 }
3855
3856
3857 static void table_list(ipfw_table_entry ent, int need_header);
3858
3859 /*
3860  * This one handles all table-related commands
3861  *      ipfw table N add addr[/masklen] [value]
3862  *      ipfw table N delete addr[/masklen]
3863  *      ipfw table {N | all} flush
3864  *      ipfw table {N | all} list
3865  */
3866 void
3867 ipfw_table_handler(int ac, char *av[])
3868 {
3869         ipfw_table_entry ent;
3870         int do_add;
3871         int is_all;
3872         size_t len;
3873         char *p;
3874         uint32_t a;
3875         uint32_t tables_max;
3876
3877         len = sizeof(tables_max);
3878         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3879                 NULL, 0) == -1) {
3880 #ifdef IPFW_TABLES_MAX
3881                 warn("Warn: Failed to get the max tables number via sysctl. "
3882                      "Using the compiled in defaults. \nThe reason was");
3883                 tables_max = IPFW_TABLES_MAX;
3884 #else
3885                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3886 #endif
3887         }
3888
3889         ac--; av++;
3890         if (ac && isdigit(**av)) {
3891                 ent.tbl = atoi(*av);
3892                 is_all = 0;
3893                 ac--; av++;
3894         } else if (ac && _substrcmp(*av, "all") == 0) {
3895                 ent.tbl = 0;
3896                 is_all = 1;
3897                 ac--; av++;
3898         } else
3899                 errx(EX_USAGE, "table number or 'all' keyword required");
3900         if (ent.tbl >= tables_max)
3901                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3902                         "value (%d)", tables_max - 1);
3903         NEED1("table needs command");
3904         if (is_all && _substrcmp(*av, "list") != 0
3905                    && _substrcmp(*av, "flush") != 0)
3906                 errx(EX_USAGE, "table number required");
3907
3908         if (_substrcmp(*av, "add") == 0 ||
3909             _substrcmp(*av, "delete") == 0) {
3910                 do_add = **av == 'a';
3911                 ac--; av++;
3912                 if (!ac)
3913                         errx(EX_USAGE, "IP address required");
3914                 p = strchr(*av, '/');
3915                 if (p) {
3916                         *p++ = '\0';
3917                         ent.masklen = atoi(p);
3918                         if (ent.masklen > 32)
3919                                 errx(EX_DATAERR, "bad width ``%s''", p);
3920                 } else
3921                         ent.masklen = 32;
3922                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3923                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3924                 ac--; av++;
3925                 if (do_add && ac) {
3926                         unsigned int tval;
3927                         /* isdigit is a bit of a hack here.. */
3928                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3929                                 ent.value = strtoul(*av, NULL, 0);
3930                         } else {
3931                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3932                                         /* The value must be stored in host order        *
3933                                          * so that the values < 65k can be distinguished */
3934                                         ent.value = ntohl(tval);
3935                                 } else {
3936                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3937                                 }
3938                         }
3939                 } else
3940                         ent.value = 0;
3941                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3942                     &ent, sizeof(ent)) < 0) {
3943                         /* If running silent, don't bomb out on these errors. */
3944                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3945                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3946                                     do_add ? "ADD" : "DEL");
3947                         /* In silent mode, react to a failed add by deleting */
3948                         if (do_add) {
3949                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3950                                 if (do_cmd(IP_FW_TABLE_ADD,
3951                                     &ent, sizeof(ent)) < 0)
3952                                         err(EX_OSERR,
3953                                             "setsockopt(IP_FW_TABLE_ADD)");
3954                         }
3955                 }
3956         } else if (_substrcmp(*av, "flush") == 0) {
3957                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3958                 do {
3959                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3960                             sizeof(ent.tbl)) < 0)
3961                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3962                 } while (++ent.tbl < a);
3963         } else if (_substrcmp(*av, "list") == 0) {
3964                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3965                 do {
3966                         table_list(ent, is_all);
3967                 } while (++ent.tbl < a);
3968         } else
3969                 errx(EX_USAGE, "invalid table command %s", *av);
3970 }
3971
3972 static void
3973 table_list(ipfw_table_entry ent, int need_header)
3974 {
3975         ipfw_table *tbl;
3976         socklen_t l;
3977         uint32_t a;
3978
3979         a = ent.tbl;
3980         l = sizeof(a);
3981         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3982                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3983
3984         /* If a is zero we have nothing to do, the table is empty. */
3985         if (a == 0)
3986                 return;
3987
3988         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3989         tbl = safe_calloc(1, l);
3990         tbl->tbl = ent.tbl;
3991         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3992                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3993         if (tbl->cnt && need_header)
3994                 printf("---table(%d)---\n", tbl->tbl);
3995         for (a = 0; a < tbl->cnt; a++) {
3996                 unsigned int tval;
3997                 tval = tbl->ent[a].value;
3998                 if (co.do_value_as_ip) {
3999                         char tbuf[128];
4000                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
4001                                 &tbl->ent[a].addr), 127);
4002                         /* inet_ntoa expects network order */
4003                         tval = htonl(tval);
4004                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
4005                                 inet_ntoa(*(struct in_addr *)&tval));
4006                 } else {
4007                         printf("%s/%u %u\n",
4008                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
4009                                 tbl->ent[a].masklen, tval);
4010                 }
4011         }
4012         free(tbl);
4013 }