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_LOG: /* O_LOG is printed last */
1115                         logptr = (ipfw_insn_log *)cmd;
1116                         break;
1117
1118                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1119                         altqptr = (ipfw_insn_altq *)cmd;
1120                         break;
1121
1122                 case O_TAG:
1123                         tagptr = cmd;
1124                         break;
1125
1126                 case O_NAT:
1127                         if (cmd->arg1 != 0)
1128                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1129                         else
1130                                 printf("nat global");
1131                         break;
1132
1133                 case O_SETFIB:
1134                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1135                         break;
1136
1137                 case O_REASS:
1138                         printf("reass");
1139                         break;
1140
1141                 case O_CALLRETURN:
1142                         if (cmd->len & F_NOT)
1143                                 printf("return");
1144                         else
1145                                 PRINT_UINT_ARG("call ", cmd->arg1);
1146                         break;
1147
1148                 default:
1149                         printf("** unrecognized action %d len %d ",
1150                                 cmd->opcode, cmd->len);
1151                 }
1152         }
1153         if (logptr) {
1154                 if (logptr->max_log > 0)
1155                         printf(" log logamount %d", logptr->max_log);
1156                 else
1157                         printf(" log");
1158         }
1159 #ifndef NO_ALTQ
1160         if (altqptr) {
1161                 print_altq_cmd(altqptr);
1162         }
1163 #endif
1164         if (tagptr) {
1165                 if (tagptr->len & F_NOT)
1166                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1167                 else
1168                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1169         }
1170
1171         /*
1172          * then print the body.
1173          */
1174         for (l = rule->act_ofs, cmd = rule->cmd ;
1175                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1176                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1177                         continue;
1178                 if (cmd->opcode == O_IP4) {
1179                         flags |= HAVE_PROTO4;
1180                         break;
1181                 } else if (cmd->opcode == O_IP6) {
1182                         flags |= HAVE_PROTO6;
1183                         break;
1184                 }
1185         }
1186         if (rule->_pad & 1) {   /* empty rules before options */
1187                 if (!co.do_compact) {
1188                         show_prerequisites(&flags, HAVE_PROTO, 0);
1189                         printf(" from any to any");
1190                 }
1191                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1192                          HAVE_SRCIP | HAVE_DSTIP;
1193         }
1194
1195         if (co.comment_only)
1196                 comment = "...";
1197
1198         for (l = rule->act_ofs, cmd = rule->cmd ;
1199                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1200                 /* useful alias */
1201                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1202
1203                 if (co.comment_only) {
1204                         if (cmd->opcode != O_NOP)
1205                                 continue;
1206                         printf(" // %s\n", (char *)(cmd + 1));
1207                         return;
1208                 }
1209
1210                 show_prerequisites(&flags, 0, cmd->opcode);
1211
1212                 switch(cmd->opcode) {
1213                 case O_PROB:
1214                         break;  /* done already */
1215
1216                 case O_PROBE_STATE:
1217                         break; /* no need to print anything here */
1218
1219                 case O_IP_SRC:
1220                 case O_IP_SRC_LOOKUP:
1221                 case O_IP_SRC_MASK:
1222                 case O_IP_SRC_ME:
1223                 case O_IP_SRC_SET:
1224                         show_prerequisites(&flags, HAVE_PROTO, 0);
1225                         if (!(flags & HAVE_SRCIP))
1226                                 printf(" from");
1227                         if ((cmd->len & F_OR) && !or_block)
1228                                 printf(" {");
1229                         print_ip((ipfw_insn_ip *)cmd,
1230                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1231                         flags |= HAVE_SRCIP;
1232                         break;
1233
1234                 case O_IP_DST:
1235                 case O_IP_DST_LOOKUP:
1236                 case O_IP_DST_MASK:
1237                 case O_IP_DST_ME:
1238                 case O_IP_DST_SET:
1239                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1240                         if (!(flags & HAVE_DSTIP))
1241                                 printf(" to");
1242                         if ((cmd->len & F_OR) && !or_block)
1243                                 printf(" {");
1244                         print_ip((ipfw_insn_ip *)cmd,
1245                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1246                         flags |= HAVE_DSTIP;
1247                         break;
1248
1249                 case O_IP6_SRC:
1250                 case O_IP6_SRC_MASK:
1251                 case O_IP6_SRC_ME:
1252                         show_prerequisites(&flags, HAVE_PROTO, 0);
1253                         if (!(flags & HAVE_SRCIP))
1254                                 printf(" from");
1255                         if ((cmd->len & F_OR) && !or_block)
1256                                 printf(" {");
1257                         print_ip6((ipfw_insn_ip6 *)cmd,
1258                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1259                         flags |= HAVE_SRCIP | HAVE_PROTO;
1260                         break;
1261
1262                 case O_IP6_DST:
1263                 case O_IP6_DST_MASK:
1264                 case O_IP6_DST_ME:
1265                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1266                         if (!(flags & HAVE_DSTIP))
1267                                 printf(" to");
1268                         if ((cmd->len & F_OR) && !or_block)
1269                                 printf(" {");
1270                         print_ip6((ipfw_insn_ip6 *)cmd,
1271                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1272                         flags |= HAVE_DSTIP;
1273                         break;
1274
1275                 case O_FLOW6ID:
1276                 print_flow6id( (ipfw_insn_u32 *) cmd );
1277                 flags |= HAVE_OPTIONS;
1278                 break;
1279
1280                 case O_IP_DSTPORT:
1281                         show_prerequisites(&flags,
1282                                 HAVE_PROTO | HAVE_SRCIP |
1283                                 HAVE_DSTIP | HAVE_IP, 0);
1284                 case O_IP_SRCPORT:
1285                         if (flags & HAVE_DSTIP)
1286                                 flags |= HAVE_IP;
1287                         show_prerequisites(&flags,
1288                                 HAVE_PROTO | HAVE_SRCIP, 0);
1289                         if ((cmd->len & F_OR) && !or_block)
1290                                 printf(" {");
1291                         if (cmd->len & F_NOT)
1292                                 printf(" not");
1293                         print_newports((ipfw_insn_u16 *)cmd, proto,
1294                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1295                         break;
1296
1297                 case O_PROTO: {
1298                         struct protoent *pe = NULL;
1299
1300                         if ((cmd->len & F_OR) && !or_block)
1301                                 printf(" {");
1302                         if (cmd->len & F_NOT)
1303                                 printf(" not");
1304                         proto = cmd->arg1;
1305                         pe = getprotobynumber(cmd->arg1);
1306                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1307                             !(flags & HAVE_PROTO))
1308                                 show_prerequisites(&flags,
1309                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1310                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1311                         if (flags & HAVE_OPTIONS)
1312                                 printf(" proto");
1313                         if (pe)
1314                                 printf(" %s", pe->p_name);
1315                         else
1316                                 printf(" %u", cmd->arg1);
1317                         }
1318                         flags |= HAVE_PROTO;
1319                         break;
1320
1321                 default: /*options ... */
1322                         if (!(cmd->len & (F_OR|F_NOT)))
1323                                 if (((cmd->opcode == O_IP6) &&
1324                                     (flags & HAVE_PROTO6)) ||
1325                                     ((cmd->opcode == O_IP4) &&
1326                                     (flags & HAVE_PROTO4)))
1327                                         break;
1328                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1329                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1330                         if ((cmd->len & F_OR) && !or_block)
1331                                 printf(" {");
1332                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1333                                 printf(" not");
1334                         switch(cmd->opcode) {
1335                         case O_MACADDR2: {
1336                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1337
1338                                 printf(" MAC");
1339                                 print_mac(m->addr, m->mask);
1340                                 print_mac(m->addr + 6, m->mask + 6);
1341                                 }
1342                                 break;
1343
1344                         case O_MAC_TYPE:
1345                                 print_newports((ipfw_insn_u16 *)cmd,
1346                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1347                                 break;
1348
1349
1350                         case O_FRAG:
1351                                 printf(" frag");
1352                                 break;
1353
1354                         case O_FIB:
1355                                 printf(" fib %u", cmd->arg1 );
1356                                 break;
1357                         case O_SOCKARG:
1358                                 printf(" sockarg");
1359                                 break;
1360
1361                         case O_IN:
1362                                 printf(cmd->len & F_NOT ? " out" : " in");
1363                                 break;
1364
1365                         case O_DIVERTED:
1366                                 switch (cmd->arg1) {
1367                                 case 3:
1368                                         printf(" diverted");
1369                                         break;
1370                                 case 1:
1371                                         printf(" diverted-loopback");
1372                                         break;
1373                                 case 2:
1374                                         printf(" diverted-output");
1375                                         break;
1376                                 default:
1377                                         printf(" diverted-?<%u>", cmd->arg1);
1378                                         break;
1379                                 }
1380                                 break;
1381
1382                         case O_LAYER2:
1383                                 printf(" layer2");
1384                                 break;
1385                         case O_XMIT:
1386                         case O_RECV:
1387                         case O_VIA:
1388                             {
1389                                 char const *s;
1390                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1391
1392                                 if (cmd->opcode == O_XMIT)
1393                                         s = "xmit";
1394                                 else if (cmd->opcode == O_RECV)
1395                                         s = "recv";
1396                                 else /* if (cmd->opcode == O_VIA) */
1397                                         s = "via";
1398                                 if (cmdif->name[0] == '\0')
1399                                         printf(" %s %s", s,
1400                                             inet_ntoa(cmdif->p.ip));
1401                                 else
1402                                         printf(" %s %s", s, cmdif->name);
1403
1404                                 break;
1405                             }
1406                         case O_IPID:
1407                                 if (F_LEN(cmd) == 1)
1408                                     printf(" ipid %u", cmd->arg1 );
1409                                 else
1410                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1411                                         O_IPID);
1412                                 break;
1413
1414                         case O_IPTTL:
1415                                 if (F_LEN(cmd) == 1)
1416                                     printf(" ipttl %u", cmd->arg1 );
1417                                 else
1418                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1419                                         O_IPTTL);
1420                                 break;
1421
1422                         case O_IPVER:
1423                                 printf(" ipver %u", cmd->arg1 );
1424                                 break;
1425
1426                         case O_IPPRECEDENCE:
1427                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1428                                 break;
1429
1430                         case O_IPLEN:
1431                                 if (F_LEN(cmd) == 1)
1432                                     printf(" iplen %u", cmd->arg1 );
1433                                 else
1434                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1435                                         O_IPLEN);
1436                                 break;
1437
1438                         case O_IPOPT:
1439                                 print_flags("ipoptions", cmd, f_ipopts);
1440                                 break;
1441
1442                         case O_IPTOS:
1443                                 print_flags("iptos", cmd, f_iptos);
1444                                 break;
1445
1446                         case O_ICMPTYPE:
1447                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1448                                 break;
1449
1450                         case O_ESTAB:
1451                                 printf(" established");
1452                                 break;
1453
1454                         case O_TCPDATALEN:
1455                                 if (F_LEN(cmd) == 1)
1456                                     printf(" tcpdatalen %u", cmd->arg1 );
1457                                 else
1458                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1459                                         O_TCPDATALEN);
1460                                 break;
1461
1462                         case O_TCPFLAGS:
1463                                 print_flags("tcpflags", cmd, f_tcpflags);
1464                                 break;
1465
1466                         case O_TCPOPTS:
1467                                 print_flags("tcpoptions", cmd, f_tcpopts);
1468                                 break;
1469
1470                         case O_TCPWIN:
1471                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1472                                 break;
1473
1474                         case O_TCPACK:
1475                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1476                                 break;
1477
1478                         case O_TCPSEQ:
1479                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1480                                 break;
1481
1482                         case O_UID:
1483                             {
1484                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1485
1486                                 if (pwd)
1487                                         printf(" uid %s", pwd->pw_name);
1488                                 else
1489                                         printf(" uid %u", cmd32->d[0]);
1490                             }
1491                                 break;
1492
1493                         case O_GID:
1494                             {
1495                                 struct group *grp = getgrgid(cmd32->d[0]);
1496
1497                                 if (grp)
1498                                         printf(" gid %s", grp->gr_name);
1499                                 else
1500                                         printf(" gid %u", cmd32->d[0]);
1501                             }
1502                                 break;
1503
1504                         case O_JAIL:
1505                                 printf(" jail %d", cmd32->d[0]);
1506                                 break;
1507
1508                         case O_VERREVPATH:
1509                                 printf(" verrevpath");
1510                                 break;
1511
1512                         case O_VERSRCREACH:
1513                                 printf(" versrcreach");
1514                                 break;
1515
1516                         case O_ANTISPOOF:
1517                                 printf(" antispoof");
1518                                 break;
1519
1520                         case O_IPSEC:
1521                                 printf(" ipsec");
1522                                 break;
1523
1524                         case O_NOP:
1525                                 comment = (char *)(cmd + 1);
1526                                 break;
1527
1528                         case O_KEEP_STATE:
1529                                 printf(" keep-state");
1530                                 break;
1531
1532                         case O_LIMIT: {
1533                                 struct _s_x *p = limit_masks;
1534                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1535                                 uint8_t x = c->limit_mask;
1536                                 char const *comma = " ";
1537
1538                                 printf(" limit");
1539                                 for (; p->x != 0 ; p++)
1540                                         if ((x & p->x) == p->x) {
1541                                                 x &= ~p->x;
1542                                                 printf("%s%s", comma, p->s);
1543                                                 comma = ",";
1544                                         }
1545                                 PRINT_UINT_ARG(" ", c->conn_limit);
1546                                 break;
1547                         }
1548
1549                         case O_IP6:
1550                                 printf(" ip6");
1551                                 break;
1552
1553                         case O_IP4:
1554                                 printf(" ip4");
1555                                 break;
1556
1557                         case O_ICMP6TYPE:
1558                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1559                                 break;
1560
1561                         case O_EXT_HDR:
1562                                 print_ext6hdr( (ipfw_insn *) cmd );
1563                                 break;
1564
1565                         case O_TAGGED:
1566                                 if (F_LEN(cmd) == 1)
1567                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1568                                 else
1569                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1570                                             O_TAGGED);
1571                                 break;
1572
1573                         default:
1574                                 printf(" [opcode %d len %d]",
1575                                     cmd->opcode, cmd->len);
1576                         }
1577                 }
1578                 if (cmd->len & F_OR) {
1579                         printf(" or");
1580                         or_block = 1;
1581                 } else if (or_block) {
1582                         printf(" }");
1583                         or_block = 0;
1584                 }
1585         }
1586         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1587                                               | HAVE_IP, 0);
1588         if (comment)
1589                 printf(" // %s", comment);
1590         printf("\n");
1591 }
1592
1593 static void
1594 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1595 {
1596         struct protoent *pe;
1597         struct in_addr a;
1598         uint16_t rulenum;
1599         char buf[INET6_ADDRSTRLEN];
1600
1601         if (!co.do_expired) {
1602                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1603                         return;
1604         }
1605         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1606         printf("%05d", rulenum);
1607         if (pcwidth > 0 || bcwidth > 0) {
1608                 printf(" ");
1609                 pr_u64(&d->pcnt, pcwidth);
1610                 pr_u64(&d->bcnt, bcwidth);
1611                 printf("(%ds)", d->expire);
1612         }
1613         switch (d->dyn_type) {
1614         case O_LIMIT_PARENT:
1615                 printf(" PARENT %d", d->count);
1616                 break;
1617         case O_LIMIT:
1618                 printf(" LIMIT");
1619                 break;
1620         case O_KEEP_STATE: /* bidir, no mask */
1621                 printf(" STATE");
1622                 break;
1623         }
1624
1625         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1626                 printf(" %s", pe->p_name);
1627         else
1628                 printf(" proto %u", d->id.proto);
1629
1630         if (d->id.addr_type == 4) {
1631                 a.s_addr = htonl(d->id.src_ip);
1632                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1633
1634                 a.s_addr = htonl(d->id.dst_ip);
1635                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1636         } else if (d->id.addr_type == 6) {
1637                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1638                     sizeof(buf)), d->id.src_port);
1639                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1640                     sizeof(buf)), d->id.dst_port);
1641         } else
1642                 printf(" UNKNOWN <-> UNKNOWN\n");
1643
1644         printf("\n");
1645 }
1646
1647 /*
1648  * This one handles all set-related commands
1649  *      ipfw set { show | enable | disable }
1650  *      ipfw set swap X Y
1651  *      ipfw set move X to Y
1652  *      ipfw set move rule X to Y
1653  */
1654 void
1655 ipfw_sets_handler(char *av[])
1656 {
1657         uint32_t set_disable, masks[2];
1658         int i, nbytes;
1659         uint16_t rulenum;
1660         uint8_t cmd, new_set;
1661
1662         av++;
1663
1664         if (av[0] == NULL)
1665                 errx(EX_USAGE, "set needs command");
1666         if (_substrcmp(*av, "show") == 0) {
1667                 void *data = NULL;
1668                 char const *msg;
1669                 int nalloc;
1670
1671                 nalloc = nbytes = sizeof(struct ip_fw);
1672                 while (nbytes >= nalloc) {
1673                         if (data)
1674                                 free(data);
1675                         nalloc = nalloc * 2 + 200;
1676                         nbytes = nalloc;
1677                         data = safe_calloc(1, nbytes);
1678                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1679                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1680                 }
1681
1682                 bcopy(&((struct ip_fw *)data)->next_rule,
1683                         &set_disable, sizeof(set_disable));
1684
1685                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1686                         if ((set_disable & (1<<i))) {
1687                                 printf("%s %d", msg, i);
1688                                 msg = "";
1689                         }
1690                 msg = (set_disable) ? " enable" : "enable";
1691                 for (i = 0; i < RESVD_SET; i++)
1692                         if (!(set_disable & (1<<i))) {
1693                                 printf("%s %d", msg, i);
1694                                 msg = "";
1695                         }
1696                 printf("\n");
1697         } else if (_substrcmp(*av, "swap") == 0) {
1698                 av++;
1699                 if ( av[0] == NULL || av[1] == NULL )
1700                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1701                 rulenum = atoi(av[0]);
1702                 new_set = atoi(av[1]);
1703                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1704                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1705                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1706                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1707                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1708                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1709         } else if (_substrcmp(*av, "move") == 0) {
1710                 av++;
1711                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1712                         cmd = 2;
1713                         av++;
1714                 } else
1715                         cmd = 3;
1716                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1717                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1718                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1719                 rulenum = atoi(av[0]);
1720                 new_set = atoi(av[2]);
1721                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1722                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1723                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1724                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1725                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1726                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1727                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1728         } else if (_substrcmp(*av, "disable") == 0 ||
1729                    _substrcmp(*av, "enable") == 0 ) {
1730                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1731
1732                 av++;
1733                 masks[0] = masks[1] = 0;
1734
1735                 while (av[0]) {
1736                         if (isdigit(**av)) {
1737                                 i = atoi(*av);
1738                                 if (i < 0 || i > RESVD_SET)
1739                                         errx(EX_DATAERR,
1740                                             "invalid set number %d\n", i);
1741                                 masks[which] |= (1<<i);
1742                         } else if (_substrcmp(*av, "disable") == 0)
1743                                 which = 0;
1744                         else if (_substrcmp(*av, "enable") == 0)
1745                                 which = 1;
1746                         else
1747                                 errx(EX_DATAERR,
1748                                         "invalid set command %s\n", *av);
1749                         av++;
1750                 }
1751                 if ( (masks[0] & masks[1]) != 0 )
1752                         errx(EX_DATAERR,
1753                             "cannot enable and disable the same set\n");
1754
1755                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1756                 if (i)
1757                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1758         } else
1759                 errx(EX_USAGE, "invalid set command %s\n", *av);
1760 }
1761
1762 void
1763 ipfw_sysctl_handler(char *av[], int which)
1764 {
1765         av++;
1766
1767         if (av[0] == NULL) {
1768                 warnx("missing keyword to enable/disable\n");
1769         } else if (_substrcmp(*av, "firewall") == 0) {
1770                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1771                     &which, sizeof(which));
1772                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1773                     &which, sizeof(which));
1774         } else if (_substrcmp(*av, "one_pass") == 0) {
1775                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1776                     &which, sizeof(which));
1777         } else if (_substrcmp(*av, "debug") == 0) {
1778                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1779                     &which, sizeof(which));
1780         } else if (_substrcmp(*av, "verbose") == 0) {
1781                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1782                     &which, sizeof(which));
1783         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1784                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1785                     &which, sizeof(which));
1786 #ifndef NO_ALTQ
1787         } else if (_substrcmp(*av, "altq") == 0) {
1788                 altq_set_enabled(which);
1789 #endif
1790         } else {
1791                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1792         }
1793 }
1794
1795 void
1796 ipfw_list(int ac, char *av[], int show_counters)
1797 {
1798         struct ip_fw *r;
1799         ipfw_dyn_rule *dynrules, *d;
1800
1801 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1802         char *lim;
1803         void *data = NULL;
1804         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1805         int exitval = EX_OK;
1806         int lac;
1807         char **lav;
1808         u_long rnum, last;
1809         char *endptr;
1810         int seen = 0;
1811         uint8_t set;
1812
1813         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1814         int nalloc = 1024;      /* start somewhere... */
1815
1816         last = 0;
1817
1818         if (co.test_only) {
1819                 fprintf(stderr, "Testing only, list disabled\n");
1820                 return;
1821         }
1822         if (co.do_pipe) {
1823                 dummynet_list(ac, av, show_counters);
1824                 return;
1825         }
1826
1827         ac--;
1828         av++;
1829
1830         /* get rules or pipes from kernel, resizing array as necessary */
1831         nbytes = nalloc;
1832
1833         while (nbytes >= nalloc) {
1834                 nalloc = nalloc * 2 + 200;
1835                 nbytes = nalloc;
1836                 data = safe_realloc(data, nbytes);
1837                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1838                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1839                                 co.do_pipe ? "DUMMYNET" : "FW");
1840         }
1841
1842         /*
1843          * Count static rules. They have variable size so we
1844          * need to scan the list to count them.
1845          */
1846         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1847                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1848                     ++nstat, r = NEXT(r) )
1849                 ; /* nothing */
1850
1851         /*
1852          * Count dynamic rules. This is easier as they have
1853          * fixed size.
1854          */
1855         r = NEXT(r);
1856         dynrules = (ipfw_dyn_rule *)r ;
1857         n = (char *)r - (char *)data;
1858         ndyn = (nbytes - n) / sizeof *dynrules;
1859
1860         /* if showing stats, figure out column widths ahead of time */
1861         bcwidth = pcwidth = 0;
1862         if (show_counters) {
1863                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1864                         /* skip rules from another set */
1865                         if (co.use_set && r->set != co.use_set - 1)
1866                                 continue;
1867
1868                         /* packet counter */
1869                         width = pr_u64(&r->pcnt, 0);
1870                         if (width > pcwidth)
1871                                 pcwidth = width;
1872
1873                         /* byte counter */
1874                         width = pr_u64(&r->bcnt, 0);
1875                         if (width > bcwidth)
1876                                 bcwidth = width;
1877                 }
1878         }
1879         if (co.do_dynamic && ndyn) {
1880                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1881                         if (co.use_set) {
1882                                 /* skip rules from another set */
1883                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1884                                       &set, sizeof(uint8_t));
1885                                 if (set != co.use_set - 1)
1886                                         continue;
1887                         }
1888                         width = pr_u64(&d->pcnt, 0);
1889                         if (width > pcwidth)
1890                                 pcwidth = width;
1891
1892                         width = pr_u64(&d->bcnt, 0);
1893                         if (width > bcwidth)
1894                                 bcwidth = width;
1895                 }
1896         }
1897         /* if no rule numbers were specified, list all rules */
1898         if (ac == 0) {
1899                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1900                         if (co.use_set && r->set != co.use_set - 1)
1901                                 continue;
1902                         show_ipfw(r, pcwidth, bcwidth);
1903                 }
1904
1905                 if (co.do_dynamic && ndyn) {
1906                         printf("## Dynamic rules (%d):\n", ndyn);
1907                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1908                                 if (co.use_set) {
1909                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1910                                               &set, sizeof(uint8_t));
1911                                         if (set != co.use_set - 1)
1912                                                 continue;
1913                                 }
1914                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1915                 }
1916                 }
1917                 goto done;
1918         }
1919
1920         /* display specific rules requested on command line */
1921
1922         for (lac = ac, lav = av; lac != 0; lac--) {
1923                 /* convert command line rule # */
1924                 last = rnum = strtoul(*lav++, &endptr, 10);
1925                 if (*endptr == '-')
1926                         last = strtoul(endptr+1, &endptr, 10);
1927                 if (*endptr) {
1928                         exitval = EX_USAGE;
1929                         warnx("invalid rule number: %s", *(lav - 1));
1930                         continue;
1931                 }
1932                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1933                         if (r->rulenum > last)
1934                                 break;
1935                         if (co.use_set && r->set != co.use_set - 1)
1936                                 continue;
1937                         if (r->rulenum >= rnum && r->rulenum <= last) {
1938                                 show_ipfw(r, pcwidth, bcwidth);
1939                                 seen = 1;
1940                         }
1941                 }
1942                 if (!seen) {
1943                         /* give precedence to other error(s) */
1944                         if (exitval == EX_OK)
1945                                 exitval = EX_UNAVAILABLE;
1946                         warnx("rule %lu does not exist", rnum);
1947                 }
1948         }
1949
1950         if (co.do_dynamic && ndyn) {
1951                 printf("## Dynamic rules:\n");
1952                 for (lac = ac, lav = av; lac != 0; lac--) {
1953                         last = rnum = strtoul(*lav++, &endptr, 10);
1954                         if (*endptr == '-')
1955                                 last = strtoul(endptr+1, &endptr, 10);
1956                         if (*endptr)
1957                                 /* already warned */
1958                                 continue;
1959                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1960                                 uint16_t rulenum;
1961
1962                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1963                                 if (rulenum > rnum)
1964                                         break;
1965                                 if (co.use_set) {
1966                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1967                                               &set, sizeof(uint8_t));
1968                                         if (set != co.use_set - 1)
1969                                                 continue;
1970                                 }
1971                                 if (r->rulenum >= rnum && r->rulenum <= last)
1972                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1973                         }
1974                 }
1975         }
1976
1977         ac = 0;
1978
1979 done:
1980         free(data);
1981
1982         if (exitval != EX_OK)
1983                 exit(exitval);
1984 #undef NEXT
1985 }
1986
1987 static int
1988 lookup_host (char *host, struct in_addr *ipaddr)
1989 {
1990         struct hostent *he;
1991
1992         if (!inet_aton(host, ipaddr)) {
1993                 if ((he = gethostbyname(host)) == NULL)
1994                         return(-1);
1995                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1996         }
1997         return(0);
1998 }
1999
2000 /*
2001  * fills the addr and mask fields in the instruction as appropriate from av.
2002  * Update length as appropriate.
2003  * The following formats are allowed:
2004  *      me      returns O_IP_*_ME
2005  *      1.2.3.4         single IP address
2006  *      1.2.3.4:5.6.7.8 address:mask
2007  *      1.2.3.4/24      address/mask
2008  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2009  * We can have multiple comma-separated address/mask entries.
2010  */
2011 static void
2012 fill_ip(ipfw_insn_ip *cmd, char *av)
2013 {
2014         int len = 0;
2015         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2016
2017         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2018
2019         if (_substrcmp(av, "any") == 0)
2020                 return;
2021
2022         if (_substrcmp(av, "me") == 0) {
2023                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2024                 return;
2025         }
2026
2027         if (strncmp(av, "table(", 6) == 0) {
2028                 char *p = strchr(av + 6, ',');
2029
2030                 if (p)
2031                         *p++ = '\0';
2032                 cmd->o.opcode = O_IP_DST_LOOKUP;
2033                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2034                 if (p) {
2035                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2036                         d[0] = strtoul(p, NULL, 0);
2037                 } else
2038                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2039                 return;
2040         }
2041
2042     while (av) {
2043         /*
2044          * After the address we can have '/' or ':' indicating a mask,
2045          * ',' indicating another address follows, '{' indicating a
2046          * set of addresses of unspecified size.
2047          */
2048         char *t = NULL, *p = strpbrk(av, "/:,{");
2049         int masklen;
2050         char md, nd = '\0';
2051
2052         if (p) {
2053                 md = *p;
2054                 *p++ = '\0';
2055                 if ((t = strpbrk(p, ",{")) != NULL) {
2056                         nd = *t;
2057                         *t = '\0';
2058                 }
2059         } else
2060                 md = '\0';
2061
2062         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2063                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2064         switch (md) {
2065         case ':':
2066                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2067                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2068                 break;
2069         case '/':
2070                 masklen = atoi(p);
2071                 if (masklen == 0)
2072                         d[1] = htonl(0);        /* mask */
2073                 else if (masklen > 32)
2074                         errx(EX_DATAERR, "bad width ``%s''", p);
2075                 else
2076                         d[1] = htonl(~0 << (32 - masklen));
2077                 break;
2078         case '{':       /* no mask, assume /24 and put back the '{' */
2079                 d[1] = htonl(~0 << (32 - 24));
2080                 *(--p) = md;
2081                 break;
2082
2083         case ',':       /* single address plus continuation */
2084                 *(--p) = md;
2085                 /* FALLTHROUGH */
2086         case 0:         /* initialization value */
2087         default:
2088                 d[1] = htonl(~0);       /* force /32 */
2089                 break;
2090         }
2091         d[0] &= d[1];           /* mask base address with mask */
2092         if (t)
2093                 *t = nd;
2094         /* find next separator */
2095         if (p)
2096                 p = strpbrk(p, ",{");
2097         if (p && *p == '{') {
2098                 /*
2099                  * We have a set of addresses. They are stored as follows:
2100                  *   arg1       is the set size (powers of 2, 2..256)
2101                  *   addr       is the base address IN HOST FORMAT
2102                  *   mask..     is an array of arg1 bits (rounded up to
2103                  *              the next multiple of 32) with bits set
2104                  *              for each host in the map.
2105                  */
2106                 uint32_t *map = (uint32_t *)&cmd->mask;
2107                 int low, high;
2108                 int i = contigmask((uint8_t *)&(d[1]), 32);
2109
2110                 if (len > 0)
2111                         errx(EX_DATAERR, "address set cannot be in a list");
2112                 if (i < 24 || i > 31)
2113                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2114                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2115                 d[0] = ntohl(d[0]);             /* base addr in host format */
2116                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2117                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2118                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2119                         map[i] = 0;     /* clear map */
2120
2121                 av = p + 1;
2122                 low = d[0] & 0xff;
2123                 high = low + cmd->o.arg1 - 1;
2124                 /*
2125                  * Here, i stores the previous value when we specify a range
2126                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2127                  * have no previous value.
2128                  */
2129                 i = -1; /* previous value in a range */
2130                 while (isdigit(*av)) {
2131                         char *s;
2132                         int a = strtol(av, &s, 0);
2133
2134                         if (s == av) { /* no parameter */
2135                             if (*av != '}')
2136                                 errx(EX_DATAERR, "set not closed\n");
2137                             if (i != -1)
2138                                 errx(EX_DATAERR, "incomplete range %d-", i);
2139                             break;
2140                         }
2141                         if (a < low || a > high)
2142                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2143                                 a, low, high);
2144                         a -= low;
2145                         if (i == -1)    /* no previous in range */
2146                             i = a;
2147                         else {          /* check that range is valid */
2148                             if (i > a)
2149                                 errx(EX_DATAERR, "invalid range %d-%d",
2150                                         i+low, a+low);
2151                             if (*s == '-')
2152                                 errx(EX_DATAERR, "double '-' in range");
2153                         }
2154                         for (; i <= a; i++)
2155                             map[i/32] |= 1<<(i & 31);
2156                         i = -1;
2157                         if (*s == '-')
2158                             i = a;
2159                         else if (*s == '}')
2160                             break;
2161                         av = s+1;
2162                 }
2163                 return;
2164         }
2165         av = p;
2166         if (av)                 /* then *av must be a ',' */
2167                 av++;
2168
2169         /* Check this entry */
2170         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2171                 /*
2172                  * 'any' turns the entire list into a NOP.
2173                  * 'not any' never matches, so it is removed from the
2174                  * list unless it is the only item, in which case we
2175                  * report an error.
2176                  */
2177                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2178                         if (av == NULL && len == 0) /* only this entry */
2179                                 errx(EX_DATAERR, "not any never matches");
2180                 }
2181                 /* else do nothing and skip this entry */
2182                 return;
2183         }
2184         /* A single IP can be stored in an optimized format */
2185         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2186                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2187                 return;
2188         }
2189         len += 2;       /* two words... */
2190         d += 2;
2191     } /* end while */
2192     if (len + 1 > F_LEN_MASK)
2193         errx(EX_DATAERR, "address list too long");
2194     cmd->o.len |= len+1;
2195 }
2196
2197
2198 /* n2mask sets n bits of the mask */
2199 void
2200 n2mask(struct in6_addr *mask, int n)
2201 {
2202         static int      minimask[9] =
2203             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2204         u_char          *p;
2205
2206         memset(mask, 0, sizeof(struct in6_addr));
2207         p = (u_char *) mask;
2208         for (; n > 0; p++, n -= 8) {
2209                 if (n >= 8)
2210                         *p = 0xff;
2211                 else
2212                         *p = minimask[n];
2213         }
2214         return;
2215 }
2216
2217 /*
2218  * helper function to process a set of flags and set bits in the
2219  * appropriate masks.
2220  */
2221 static void
2222 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2223         struct _s_x *flags, char *p)
2224 {
2225         uint8_t set=0, clear=0;
2226
2227         while (p && *p) {
2228                 char *q;        /* points to the separator */
2229                 int val;
2230                 uint8_t *which; /* mask we are working on */
2231
2232                 if (*p == '!') {
2233                         p++;
2234                         which = &clear;
2235                 } else
2236                         which = &set;
2237                 q = strchr(p, ',');
2238                 if (q)
2239                         *q++ = '\0';
2240                 val = match_token(flags, p);
2241                 if (val <= 0)
2242                         errx(EX_DATAERR, "invalid flag %s", p);
2243                 *which |= (uint8_t)val;
2244                 p = q;
2245         }
2246         cmd->opcode = opcode;
2247         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2248         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2249 }
2250
2251
2252 void
2253 ipfw_delete(char *av[])
2254 {
2255         uint32_t rulenum;
2256         int i;
2257         int exitval = EX_OK;
2258         int do_set = 0;
2259
2260         av++;
2261         NEED1("missing rule specification");
2262         if ( *av && _substrcmp(*av, "set") == 0) {
2263                 /* Do not allow using the following syntax:
2264                  *      ipfw set N delete set M
2265                  */
2266                 if (co.use_set)
2267                         errx(EX_DATAERR, "invalid syntax");
2268                 do_set = 1;     /* delete set */
2269                 av++;
2270         }
2271
2272         /* Rule number */
2273         while (*av && isdigit(**av)) {
2274                 i = atoi(*av); av++;
2275                 if (co.do_nat) {
2276                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2277                         if (exitval) {
2278                                 exitval = EX_UNAVAILABLE;
2279                                 warn("rule %u not available", i);
2280                         }
2281                 } else if (co.do_pipe) {
2282                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2283                 } else {
2284                         if (co.use_set)
2285                                 rulenum = (i & 0xffff) | (5 << 24) |
2286                                     ((co.use_set - 1) << 16);
2287                         else
2288                         rulenum =  (i & 0xffff) | (do_set << 24);
2289                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2290                         if (i) {
2291                                 exitval = EX_UNAVAILABLE;
2292                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2293                                     rulenum);
2294                         }
2295                 }
2296         }
2297         if (exitval != EX_OK)
2298                 exit(exitval);
2299 }
2300
2301
2302 /*
2303  * fill the interface structure. We do not check the name as we can
2304  * create interfaces dynamically, so checking them at insert time
2305  * makes relatively little sense.
2306  * Interface names containing '*', '?', or '[' are assumed to be shell
2307  * patterns which match interfaces.
2308  */
2309 static void
2310 fill_iface(ipfw_insn_if *cmd, char *arg)
2311 {
2312         cmd->name[0] = '\0';
2313         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2314
2315         /* Parse the interface or address */
2316         if (strcmp(arg, "any") == 0)
2317                 cmd->o.len = 0;         /* effectively ignore this command */
2318         else if (!isdigit(*arg)) {
2319                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2320                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2321         } else if (!inet_aton(arg, &cmd->p.ip))
2322                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2323 }
2324
2325 static void
2326 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2327 {
2328         int i;
2329         size_t l;
2330         char *ap, *ptr, *optr;
2331         struct ether_addr *mac;
2332         const char *macset = "0123456789abcdefABCDEF:";
2333
2334         if (strcmp(p, "any") == 0) {
2335                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2336                         addr[i] = mask[i] = 0;
2337                 return;
2338         }
2339
2340         optr = ptr = strdup(p);
2341         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2342                 l = strlen(ap);
2343                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2344                         errx(EX_DATAERR, "Incorrect MAC address");
2345                 bcopy(mac, addr, ETHER_ADDR_LEN);
2346         } else
2347                 errx(EX_DATAERR, "Incorrect MAC address");
2348
2349         if (ptr != NULL) { /* we have mask? */
2350                 if (p[ptr - optr - 1] == '/') { /* mask len */
2351                         long ml = strtol(ptr, &ap, 10);
2352                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2353                                 errx(EX_DATAERR, "Incorrect mask length");
2354                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2355                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2356                 } else { /* mask */
2357                         l = strlen(ptr);
2358                         if (strspn(ptr, macset) != l ||
2359                             (mac = ether_aton(ptr)) == NULL)
2360                                 errx(EX_DATAERR, "Incorrect mask");
2361                         bcopy(mac, mask, ETHER_ADDR_LEN);
2362                 }
2363         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2364                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2365                         mask[i] = 0xff;
2366         }
2367         for (i = 0; i < ETHER_ADDR_LEN; i++)
2368                 addr[i] &= mask[i];
2369
2370         free(optr);
2371 }
2372
2373 /*
2374  * helper function, updates the pointer to cmd with the length
2375  * of the current command, and also cleans up the first word of
2376  * the new command in case it has been clobbered before.
2377  */
2378 static ipfw_insn *
2379 next_cmd(ipfw_insn *cmd)
2380 {
2381         cmd += F_LEN(cmd);
2382         bzero(cmd, sizeof(*cmd));
2383         return cmd;
2384 }
2385
2386 /*
2387  * Takes arguments and copies them into a comment
2388  */
2389 static void
2390 fill_comment(ipfw_insn *cmd, char **av)
2391 {
2392         int i, l;
2393         char *p = (char *)(cmd + 1);
2394
2395         cmd->opcode = O_NOP;
2396         cmd->len =  (cmd->len & (F_NOT | F_OR));
2397
2398         /* Compute length of comment string. */
2399         for (i = 0, l = 0; av[i] != NULL; i++)
2400                 l += strlen(av[i]) + 1;
2401         if (l == 0)
2402                 return;
2403         if (l > 84)
2404                 errx(EX_DATAERR,
2405                     "comment too long (max 80 chars)");
2406         l = 1 + (l+3)/4;
2407         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2408         for (i = 0; av[i] != NULL; i++) {
2409                 strcpy(p, av[i]);
2410                 p += strlen(av[i]);
2411                 *p++ = ' ';
2412         }
2413         *(--p) = '\0';
2414 }
2415
2416 /*
2417  * A function to fill simple commands of size 1.
2418  * Existing flags are preserved.
2419  */
2420 static void
2421 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2422 {
2423         cmd->opcode = opcode;
2424         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2425         cmd->arg1 = arg;
2426 }
2427
2428 /*
2429  * Fetch and add the MAC address and type, with masks. This generates one or
2430  * two microinstructions, and returns the pointer to the last one.
2431  */
2432 static ipfw_insn *
2433 add_mac(ipfw_insn *cmd, char *av[])
2434 {
2435         ipfw_insn_mac *mac;
2436
2437         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2438                 errx(EX_DATAERR, "MAC dst src");
2439
2440         cmd->opcode = O_MACADDR2;
2441         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2442
2443         mac = (ipfw_insn_mac *)cmd;
2444         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2445         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2446             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2447         return cmd;
2448 }
2449
2450 static ipfw_insn *
2451 add_mactype(ipfw_insn *cmd, char *av)
2452 {
2453         if (!av)
2454                 errx(EX_DATAERR, "missing MAC type");
2455         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2456                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2457                 cmd->opcode = O_MAC_TYPE;
2458                 return cmd;
2459         } else
2460                 return NULL;
2461 }
2462
2463 static ipfw_insn *
2464 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2465 {
2466         struct protoent *pe;
2467         char *ep;
2468         int proto;
2469
2470         proto = strtol(av, &ep, 10);
2471         if (*ep != '\0' || proto <= 0) {
2472                 if ((pe = getprotobyname(av)) == NULL)
2473                         return NULL;
2474                 proto = pe->p_proto;
2475         }
2476
2477         fill_cmd(cmd, O_PROTO, 0, proto);
2478         *protop = proto;
2479         return cmd;
2480 }
2481
2482 static ipfw_insn *
2483 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2484 {
2485         u_char proto = IPPROTO_IP;
2486
2487         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2488                 ; /* do not set O_IP4 nor O_IP6 */
2489         else if (strcmp(av, "ip4") == 0)
2490                 /* explicit "just IPv4" rule */
2491                 fill_cmd(cmd, O_IP4, 0, 0);
2492         else if (strcmp(av, "ip6") == 0) {
2493                 /* explicit "just IPv6" rule */
2494                 proto = IPPROTO_IPV6;
2495                 fill_cmd(cmd, O_IP6, 0, 0);
2496         } else
2497                 return add_proto0(cmd, av, protop);
2498
2499         *protop = proto;
2500         return cmd;
2501 }
2502
2503 static ipfw_insn *
2504 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2505 {
2506         u_char proto = IPPROTO_IP;
2507
2508         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2509                 ; /* do not set O_IP4 nor O_IP6 */
2510         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2511                 /* explicit "just IPv4" rule */
2512                 fill_cmd(cmd, O_IP4, 0, 0);
2513         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2514                 /* explicit "just IPv6" rule */
2515                 proto = IPPROTO_IPV6;
2516                 fill_cmd(cmd, O_IP6, 0, 0);
2517         } else
2518                 return add_proto0(cmd, av, protop);
2519
2520         *protop = proto;
2521         return cmd;
2522 }
2523
2524 static ipfw_insn *
2525 add_srcip(ipfw_insn *cmd, char *av)
2526 {
2527         fill_ip((ipfw_insn_ip *)cmd, av);
2528         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2529                 cmd->opcode = O_IP_SRC_SET;
2530         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2531                 cmd->opcode = O_IP_SRC_LOOKUP;
2532         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2533                 cmd->opcode = O_IP_SRC_ME;
2534         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2535                 cmd->opcode = O_IP_SRC;
2536         else                                                    /* addr/mask */
2537                 cmd->opcode = O_IP_SRC_MASK;
2538         return cmd;
2539 }
2540
2541 static ipfw_insn *
2542 add_dstip(ipfw_insn *cmd, char *av)
2543 {
2544         fill_ip((ipfw_insn_ip *)cmd, av);
2545         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2546                 ;
2547         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2548                 ;
2549         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2550                 cmd->opcode = O_IP_DST_ME;
2551         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2552                 cmd->opcode = O_IP_DST;
2553         else                                                    /* addr/mask */
2554                 cmd->opcode = O_IP_DST_MASK;
2555         return cmd;
2556 }
2557
2558 static ipfw_insn *
2559 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2560 {
2561         /* XXX "any" is trapped before. Perhaps "to" */
2562         if (_substrcmp(av, "any") == 0) {
2563                 return NULL;
2564         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2565                 /* XXX todo: check that we have a protocol with ports */
2566                 cmd->opcode = opcode;
2567                 return cmd;
2568         }
2569         return NULL;
2570 }
2571
2572 static ipfw_insn *
2573 add_src(ipfw_insn *cmd, char *av, u_char proto)
2574 {
2575         struct in6_addr a;
2576         char *host, *ch;
2577         ipfw_insn *ret = NULL;
2578
2579         if ((host = strdup(av)) == NULL)
2580                 return NULL;
2581         if ((ch = strrchr(host, '/')) != NULL)
2582                 *ch = '\0';
2583
2584         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2585             inet_pton(AF_INET6, host, &a) == 1)
2586                 ret = add_srcip6(cmd, av);
2587         /* XXX: should check for IPv4, not !IPv6 */
2588         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2589             inet_pton(AF_INET6, host, &a) != 1))
2590                 ret = add_srcip(cmd, av);
2591         if (ret == NULL && strcmp(av, "any") != 0)
2592                 ret = cmd;
2593
2594         free(host);
2595         return ret;
2596 }
2597
2598 static ipfw_insn *
2599 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2600 {
2601         struct in6_addr a;
2602         char *host, *ch;
2603         ipfw_insn *ret = NULL;
2604
2605         if ((host = strdup(av)) == NULL)
2606                 return NULL;
2607         if ((ch = strrchr(host, '/')) != NULL)
2608                 *ch = '\0';
2609
2610         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2611             inet_pton(AF_INET6, host, &a) == 1)
2612                 ret = add_dstip6(cmd, av);
2613         /* XXX: should check for IPv4, not !IPv6 */
2614         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2615             inet_pton(AF_INET6, host, &a) != 1))
2616                 ret = add_dstip(cmd, av);
2617         if (ret == NULL && strcmp(av, "any") != 0)
2618                 ret = cmd;
2619
2620         free(host);
2621         return ret;
2622 }
2623
2624 /*
2625  * Parse arguments and assemble the microinstructions which make up a rule.
2626  * Rules are added into the 'rulebuf' and then copied in the correct order
2627  * into the actual rule.
2628  *
2629  * The syntax for a rule starts with the action, followed by
2630  * optional action parameters, and the various match patterns.
2631  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2632  * (generated if the rule includes a keep-state option), then the
2633  * various match patterns, log/altq actions, and the actual action.
2634  *
2635  */
2636 void
2637 ipfw_add(char *av[])
2638 {
2639         /*
2640          * rules are added into the 'rulebuf' and then copied in
2641          * the correct order into the actual rule.
2642          * Some things that need to go out of order (prob, action etc.)
2643          * go into actbuf[].
2644          */
2645         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2646
2647         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2648         ipfw_insn *first_cmd;   /* first match pattern */
2649
2650         struct ip_fw *rule;
2651
2652         /*
2653          * various flags used to record that we entered some fields.
2654          */
2655         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2656         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2657         size_t len;
2658
2659         int i;
2660
2661         int open_par = 0;       /* open parenthesis ( */
2662
2663         /* proto is here because it is used to fetch ports */
2664         u_char proto = IPPROTO_IP;      /* default protocol */
2665
2666         double match_prob = 1; /* match probability, default is always match */
2667
2668         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2669         bzero(cmdbuf, sizeof(cmdbuf));
2670         bzero(rulebuf, sizeof(rulebuf));
2671
2672         rule = (struct ip_fw *)rulebuf;
2673         cmd = (ipfw_insn *)cmdbuf;
2674         action = (ipfw_insn *)actbuf;
2675
2676         av++;
2677
2678         /* [rule N]     -- Rule number optional */
2679         if (av[0] && isdigit(**av)) {
2680                 rule->rulenum = atoi(*av);
2681                 av++;
2682         }
2683
2684         /* [set N]      -- set number (0..RESVD_SET), optional */
2685         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2686                 int set = strtoul(av[1], NULL, 10);
2687                 if (set < 0 || set > RESVD_SET)
2688                         errx(EX_DATAERR, "illegal set %s", av[1]);
2689                 rule->set = set;
2690                 av += 2;
2691         }
2692
2693         /* [prob D]     -- match probability, optional */
2694         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2695                 match_prob = strtod(av[1], NULL);
2696
2697                 if (match_prob <= 0 || match_prob > 1)
2698                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2699                 av += 2;
2700         }
2701
2702         /* action       -- mandatory */
2703         NEED1("missing action");
2704         i = match_token(rule_actions, *av);
2705         av++;
2706         action->len = 1;        /* default */
2707         switch(i) {
2708         case TOK_CHECKSTATE:
2709                 have_state = action;
2710                 action->opcode = O_CHECK_STATE;
2711                 break;
2712
2713         case TOK_ACCEPT:
2714                 action->opcode = O_ACCEPT;
2715                 break;
2716
2717         case TOK_DENY:
2718                 action->opcode = O_DENY;
2719                 action->arg1 = 0;
2720                 break;
2721
2722         case TOK_REJECT:
2723                 action->opcode = O_REJECT;
2724                 action->arg1 = ICMP_UNREACH_HOST;
2725                 break;
2726
2727         case TOK_RESET:
2728                 action->opcode = O_REJECT;
2729                 action->arg1 = ICMP_REJECT_RST;
2730                 break;
2731
2732         case TOK_RESET6:
2733                 action->opcode = O_UNREACH6;
2734                 action->arg1 = ICMP6_UNREACH_RST;
2735                 break;
2736
2737         case TOK_UNREACH:
2738                 action->opcode = O_REJECT;
2739                 NEED1("missing reject code");
2740                 fill_reject_code(&action->arg1, *av);
2741                 av++;
2742                 break;
2743
2744         case TOK_UNREACH6:
2745                 action->opcode = O_UNREACH6;
2746                 NEED1("missing unreach code");
2747                 fill_unreach6_code(&action->arg1, *av);
2748                 av++;
2749                 break;
2750
2751         case TOK_COUNT:
2752                 action->opcode = O_COUNT;
2753                 break;
2754
2755         case TOK_NAT:
2756                 action->opcode = O_NAT;
2757                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2758                 if (_substrcmp(*av, "global") == 0) {
2759                         action->arg1 = 0;
2760                         av++;
2761                         break;
2762                 } else
2763                         goto chkarg;
2764
2765         case TOK_QUEUE:
2766                 action->opcode = O_QUEUE;
2767                 goto chkarg;
2768         case TOK_PIPE:
2769                 action->opcode = O_PIPE;
2770                 goto chkarg;
2771         case TOK_SKIPTO:
2772                 action->opcode = O_SKIPTO;
2773                 goto chkarg;
2774         case TOK_NETGRAPH:
2775                 action->opcode = O_NETGRAPH;
2776                 goto chkarg;
2777         case TOK_NGTEE:
2778                 action->opcode = O_NGTEE;
2779                 goto chkarg;
2780         case TOK_DIVERT:
2781                 action->opcode = O_DIVERT;
2782                 goto chkarg;
2783         case TOK_TEE:
2784                 action->opcode = O_TEE;
2785                 goto chkarg;
2786         case TOK_CALL:
2787                 action->opcode = O_CALLRETURN;
2788 chkarg:
2789                 if (!av[0])
2790                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2791                 if (isdigit(**av)) {
2792                         action->arg1 = strtoul(*av, NULL, 10);
2793                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2794                                 errx(EX_DATAERR, "illegal argument for %s",
2795                                     *(av - 1));
2796                 } else if (_substrcmp(*av, "tablearg") == 0) {
2797                         action->arg1 = IP_FW_TABLEARG;
2798                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2799                         struct servent *s;
2800                         setservent(1);
2801                         s = getservbyname(av[0], "divert");
2802                         if (s != NULL)
2803                                 action->arg1 = ntohs(s->s_port);
2804                         else
2805                                 errx(EX_DATAERR, "illegal divert/tee port");
2806                 } else
2807                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2808                 av++;
2809                 break;
2810
2811         case TOK_FORWARD: {
2812                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2813                 char *s, *end;
2814
2815                 NEED1("missing forward address[:port]");
2816
2817                 action->opcode = O_FORWARD_IP;
2818                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2819
2820                 /*
2821                  * In the kernel we assume AF_INET and use only
2822                  * sin_port and sin_addr. Remember to set sin_len as
2823                  * the routing code seems to use it too.
2824                  */
2825                 p->sa.sin_family = AF_INET;
2826                 p->sa.sin_len = sizeof(struct sockaddr_in);
2827                 p->sa.sin_port = 0;
2828                 /*
2829                  * locate the address-port separator (':' or ',')
2830                  */
2831                 s = strchr(*av, ':');
2832                 if (s == NULL)
2833                         s = strchr(*av, ',');
2834                 if (s != NULL) {
2835                         *(s++) = '\0';
2836                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2837                         if (s == end)
2838                                 errx(EX_DATAERR,
2839                                     "illegal forwarding port ``%s''", s);
2840                         p->sa.sin_port = (u_short)i;
2841                 }
2842                 if (_substrcmp(*av, "tablearg") == 0)
2843                         p->sa.sin_addr.s_addr = INADDR_ANY;
2844                 else
2845                         lookup_host(*av, &(p->sa.sin_addr));
2846                 av++;
2847                 break;
2848             }
2849         case TOK_COMMENT:
2850                 /* pretend it is a 'count' rule followed by the comment */
2851                 action->opcode = O_COUNT;
2852                 av--;           /* go back... */
2853                 break;
2854
2855         case TOK_SETFIB:
2856             {
2857                 int numfibs;
2858                 size_t intsize = sizeof(int);
2859
2860                 action->opcode = O_SETFIB;
2861                 NEED1("missing fib number");
2862                 if (_substrcmp(*av, "tablearg") == 0) {
2863                         action->arg1 = IP_FW_TABLEARG;
2864                 } else {
2865                         action->arg1 = strtoul(*av, NULL, 10);
2866                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
2867                             NULL, 0) == -1)
2868                                 errx(EX_DATAERR, "fibs not suported.\n");
2869                         if (action->arg1 >= numfibs)  /* Temporary */
2870                                 errx(EX_DATAERR, "fib too large.\n");
2871                 }
2872                 av++;
2873                 break;
2874             }
2875
2876         case TOK_REASS:
2877                 action->opcode = O_REASS;
2878                 break;
2879
2880         case TOK_RETURN:
2881                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
2882                 break;
2883
2884         default:
2885                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2886         }
2887         action = next_cmd(action);
2888
2889         /*
2890          * [altq queuename] -- altq tag, optional
2891          * [log [logamount N]]  -- log, optional
2892          *
2893          * If they exist, it go first in the cmdbuf, but then it is
2894          * skipped in the copy section to the end of the buffer.
2895          */
2896         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
2897                 av++;
2898                 switch (i) {
2899                 case TOK_LOG:
2900                     {
2901                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2902                         int l;
2903
2904                         if (have_log)
2905                                 errx(EX_DATAERR,
2906                                     "log cannot be specified more than once");
2907                         have_log = (ipfw_insn *)c;
2908                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2909                         cmd->opcode = O_LOG;
2910                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
2911                                 av++;
2912                                 NEED1("logamount requires argument");
2913                                 l = atoi(*av);
2914                                 if (l < 0)
2915                                         errx(EX_DATAERR,
2916                                             "logamount must be positive");
2917                                 c->max_log = l;
2918                                 av++;
2919                         } else {
2920                                 len = sizeof(c->max_log);
2921                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2922                                     &c->max_log, &len, NULL, 0) == -1)
2923                                         errx(1, "sysctlbyname(\"%s\")",
2924                                             "net.inet.ip.fw.verbose_limit");
2925                         }
2926                     }
2927                         break;
2928
2929 #ifndef NO_ALTQ
2930                 case TOK_ALTQ:
2931                     {
2932                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2933
2934                         NEED1("missing altq queue name");
2935                         if (have_altq)
2936                                 errx(EX_DATAERR,
2937                                     "altq cannot be specified more than once");
2938                         have_altq = (ipfw_insn *)a;
2939                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2940                         cmd->opcode = O_ALTQ;
2941                         a->qid = altq_name_to_qid(*av);
2942                         av++;
2943                     }
2944                         break;
2945 #endif
2946
2947                 case TOK_TAG:
2948                 case TOK_UNTAG: {
2949                         uint16_t tag;
2950
2951                         if (have_tag)
2952                                 errx(EX_USAGE, "tag and untag cannot be "
2953                                     "specified more than once");
2954                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
2955                            rule_action_params);
2956                         have_tag = cmd;
2957                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2958                         av++;
2959                         break;
2960                 }
2961
2962                 default:
2963                         abort();
2964                 }
2965                 cmd = next_cmd(cmd);
2966         }
2967
2968         if (have_state) /* must be a check-state, we are done */
2969                 goto done;
2970
2971 #define OR_START(target)                                        \
2972         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
2973                 if (open_par)                                   \
2974                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2975                 prev = NULL;                                    \
2976                 open_par = 1;                                   \
2977                 if ( (av[0])[1] == '\0') {                      \
2978                         av++;                                   \
2979                 } else                                          \
2980                         (*av)++;                                \
2981         }                                                       \
2982         target:                                                 \
2983
2984
2985 #define CLOSE_PAR                                               \
2986         if (open_par) {                                         \
2987                 if (av[0] && (                                  \
2988                     strcmp(*av, ")") == 0 ||                    \
2989                     strcmp(*av, "}") == 0)) {                   \
2990                         prev = NULL;                            \
2991                         open_par = 0;                           \
2992                         av++;                                   \
2993                 } else                                          \
2994                         errx(EX_USAGE, "missing \")\"\n");      \
2995         }
2996
2997 #define NOT_BLOCK                                               \
2998         if (av[0] && _substrcmp(*av, "not") == 0) {             \
2999                 if (cmd->len & F_NOT)                           \
3000                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3001                 cmd->len |= F_NOT;                              \
3002                 av++;                                           \
3003         }
3004
3005 #define OR_BLOCK(target)                                        \
3006         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3007                 if (prev == NULL || open_par == 0)              \
3008                         errx(EX_DATAERR, "invalid OR block");   \
3009                 prev->len |= F_OR;                              \
3010                 av++;                                   \
3011                 goto target;                                    \
3012         }                                                       \
3013         CLOSE_PAR;
3014
3015         first_cmd = cmd;
3016
3017 #if 0
3018         /*
3019          * MAC addresses, optional.
3020          * If we have this, we skip the part "proto from src to dst"
3021          * and jump straight to the option parsing.
3022          */
3023         NOT_BLOCK;
3024         NEED1("missing protocol");
3025         if (_substrcmp(*av, "MAC") == 0 ||
3026             _substrcmp(*av, "mac") == 0) {
3027                 av++;                   /* the "MAC" keyword */
3028                 add_mac(cmd, av);       /* exits in case of errors */
3029                 cmd = next_cmd(cmd);
3030                 av += 2;                /* dst-mac and src-mac */
3031                 NOT_BLOCK;
3032                 NEED1("missing mac type");
3033                 if (add_mactype(cmd, av[0]))
3034                         cmd = next_cmd(cmd);
3035                 av++;                   /* any or mac-type */
3036                 goto read_options;
3037         }
3038 #endif
3039
3040         /*
3041          * protocol, mandatory
3042          */
3043     OR_START(get_proto);
3044         NOT_BLOCK;
3045         NEED1("missing protocol");
3046         if (add_proto_compat(cmd, *av, &proto)) {
3047                 av++;
3048                 if (F_LEN(cmd) != 0) {
3049                         prev = cmd;
3050                         cmd = next_cmd(cmd);
3051                 }
3052         } else if (first_cmd != cmd) {
3053                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3054         } else
3055                 goto read_options;
3056     OR_BLOCK(get_proto);
3057
3058         /*
3059          * "from", mandatory
3060          */
3061         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3062                 errx(EX_USAGE, "missing ``from''");
3063         av++;
3064
3065         /*
3066          * source IP, mandatory
3067          */
3068     OR_START(source_ip);
3069         NOT_BLOCK;      /* optional "not" */
3070         NEED1("missing source address");
3071         if (add_src(cmd, *av, proto)) {
3072                 av++;
3073                 if (F_LEN(cmd) != 0) {  /* ! any */
3074                         prev = cmd;
3075                         cmd = next_cmd(cmd);
3076                 }
3077         } else
3078                 errx(EX_USAGE, "bad source address %s", *av);
3079     OR_BLOCK(source_ip);
3080
3081         /*
3082          * source ports, optional
3083          */
3084         NOT_BLOCK;      /* optional "not" */
3085         if ( av[0] != NULL ) {
3086                 if (_substrcmp(*av, "any") == 0 ||
3087                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3088                         av++;
3089                         if (F_LEN(cmd) != 0)
3090                                 cmd = next_cmd(cmd);
3091                 }
3092         }
3093
3094         /*
3095          * "to", mandatory
3096          */
3097         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3098                 errx(EX_USAGE, "missing ``to''");
3099         av++;
3100
3101         /*
3102          * destination, mandatory
3103          */
3104     OR_START(dest_ip);
3105         NOT_BLOCK;      /* optional "not" */
3106         NEED1("missing dst address");
3107         if (add_dst(cmd, *av, proto)) {
3108                 av++;
3109                 if (F_LEN(cmd) != 0) {  /* ! any */
3110                         prev = cmd;
3111                         cmd = next_cmd(cmd);
3112                 }
3113         } else
3114                 errx( EX_USAGE, "bad destination address %s", *av);
3115     OR_BLOCK(dest_ip);
3116
3117         /*
3118          * dest. ports, optional
3119          */
3120         NOT_BLOCK;      /* optional "not" */
3121         if (av[0]) {
3122                 if (_substrcmp(*av, "any") == 0 ||
3123                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3124                         av++;
3125                         if (F_LEN(cmd) != 0)
3126                                 cmd = next_cmd(cmd);
3127                 }
3128         }
3129
3130 read_options:
3131         if (av[0] && first_cmd == cmd) {
3132                 /*
3133                  * nothing specified so far, store in the rule to ease
3134                  * printout later.
3135                  */
3136                  rule->_pad = 1;
3137         }
3138         prev = NULL;
3139         while ( av[0] != NULL ) {
3140                 char *s;
3141                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3142
3143                 s = *av;
3144                 cmd32 = (ipfw_insn_u32 *)cmd;
3145
3146                 if (*s == '!') {        /* alternate syntax for NOT */
3147                         if (cmd->len & F_NOT)
3148                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3149                         cmd->len = F_NOT;
3150                         s++;
3151                 }
3152                 i = match_token(rule_options, s);
3153                 av++;
3154                 switch(i) {
3155                 case TOK_NOT:
3156                         if (cmd->len & F_NOT)
3157                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3158                         cmd->len = F_NOT;
3159                         break;
3160
3161                 case TOK_OR:
3162                         if (open_par == 0 || prev == NULL)
3163                                 errx(EX_USAGE, "invalid \"or\" block\n");
3164                         prev->len |= F_OR;
3165                         break;
3166
3167                 case TOK_STARTBRACE:
3168                         if (open_par)
3169                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3170                         open_par = 1;
3171                         break;
3172
3173                 case TOK_ENDBRACE:
3174                         if (!open_par)
3175                                 errx(EX_USAGE, "+missing \")\"\n");
3176                         open_par = 0;
3177                         prev = NULL;
3178                         break;
3179
3180                 case TOK_IN:
3181                         fill_cmd(cmd, O_IN, 0, 0);
3182                         break;
3183
3184                 case TOK_OUT:
3185                         cmd->len ^= F_NOT; /* toggle F_NOT */
3186                         fill_cmd(cmd, O_IN, 0, 0);
3187                         break;
3188
3189                 case TOK_DIVERTED:
3190                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3191                         break;
3192
3193                 case TOK_DIVERTEDLOOPBACK:
3194                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3195                         break;
3196
3197                 case TOK_DIVERTEDOUTPUT:
3198                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3199                         break;
3200
3201                 case TOK_FRAG:
3202                         fill_cmd(cmd, O_FRAG, 0, 0);
3203                         break;
3204
3205                 case TOK_LAYER2:
3206                         fill_cmd(cmd, O_LAYER2, 0, 0);
3207                         break;
3208
3209                 case TOK_XMIT:
3210                 case TOK_RECV:
3211                 case TOK_VIA:
3212                         NEED1("recv, xmit, via require interface name"
3213                                 " or address");
3214                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3215                         av++;
3216                         if (F_LEN(cmd) == 0)    /* not a valid address */
3217                                 break;
3218                         if (i == TOK_XMIT)
3219                                 cmd->opcode = O_XMIT;
3220                         else if (i == TOK_RECV)
3221                                 cmd->opcode = O_RECV;
3222                         else if (i == TOK_VIA)
3223                                 cmd->opcode = O_VIA;
3224                         break;
3225
3226                 case TOK_ICMPTYPES:
3227                         NEED1("icmptypes requires list of types");
3228                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3229                         av++;
3230                         break;
3231
3232                 case TOK_ICMP6TYPES:
3233                         NEED1("icmptypes requires list of types");
3234                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3235                         av++;
3236                         break;
3237
3238                 case TOK_IPTTL:
3239                         NEED1("ipttl requires TTL");
3240                         if (strpbrk(*av, "-,")) {
3241                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3242                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3243                         } else
3244                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3245                         av++;
3246                         break;
3247
3248                 case TOK_IPID:
3249                         NEED1("ipid requires id");
3250                         if (strpbrk(*av, "-,")) {
3251                             if (!add_ports(cmd, *av, 0, O_IPID))
3252                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3253                         } else
3254                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3255                         av++;
3256                         break;
3257
3258                 case TOK_IPLEN:
3259                         NEED1("iplen requires length");
3260                         if (strpbrk(*av, "-,")) {
3261                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3262                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3263                         } else
3264                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3265                         av++;
3266                         break;
3267
3268                 case TOK_IPVER:
3269                         NEED1("ipver requires version");
3270                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3271                         av++;
3272                         break;
3273
3274                 case TOK_IPPRECEDENCE:
3275                         NEED1("ipprecedence requires value");
3276                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3277                             (strtoul(*av, NULL, 0) & 7) << 5);
3278                         av++;
3279                         break;
3280
3281                 case TOK_IPOPTS:
3282                         NEED1("missing argument for ipoptions");
3283                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3284                         av++;
3285                         break;
3286
3287                 case TOK_IPTOS:
3288                         NEED1("missing argument for iptos");
3289                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3290                         av++;
3291                         break;
3292
3293                 case TOK_UID:
3294                         NEED1("uid requires argument");
3295                     {
3296                         char *end;
3297                         uid_t uid;
3298                         struct passwd *pwd;
3299
3300                         cmd->opcode = O_UID;
3301                         uid = strtoul(*av, &end, 0);
3302                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3303                         if (pwd == NULL)
3304                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3305                         cmd32->d[0] = pwd->pw_uid;
3306                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3307                         av++;
3308                     }
3309                         break;
3310
3311                 case TOK_GID:
3312                         NEED1("gid requires argument");
3313                     {
3314                         char *end;
3315                         gid_t gid;
3316                         struct group *grp;
3317
3318                         cmd->opcode = O_GID;
3319                         gid = strtoul(*av, &end, 0);
3320                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3321                         if (grp == NULL)
3322                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3323                         cmd32->d[0] = grp->gr_gid;
3324                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3325                         av++;
3326                     }
3327                         break;
3328
3329                 case TOK_JAIL:
3330                         NEED1("jail requires argument");
3331                     {
3332                         char *end;
3333                         int jid;
3334
3335                         cmd->opcode = O_JAIL;
3336                         jid = (int)strtol(*av, &end, 0);
3337                         if (jid < 0 || *end != '\0')
3338                                 errx(EX_DATAERR, "jail requires prison ID");
3339                         cmd32->d[0] = (uint32_t)jid;
3340                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3341                         av++;
3342                     }
3343                         break;
3344
3345                 case TOK_ESTAB:
3346                         fill_cmd(cmd, O_ESTAB, 0, 0);
3347                         break;
3348
3349                 case TOK_SETUP:
3350                         fill_cmd(cmd, O_TCPFLAGS, 0,
3351                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3352                         break;
3353
3354                 case TOK_TCPDATALEN:
3355                         NEED1("tcpdatalen requires length");
3356                         if (strpbrk(*av, "-,")) {
3357                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3358                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3359                         } else
3360                             fill_cmd(cmd, O_TCPDATALEN, 0,
3361                                     strtoul(*av, NULL, 0));
3362                         av++;
3363                         break;
3364
3365                 case TOK_TCPOPTS:
3366                         NEED1("missing argument for tcpoptions");
3367                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3368                         av++;
3369                         break;
3370
3371                 case TOK_TCPSEQ:
3372                 case TOK_TCPACK:
3373                         NEED1("tcpseq/tcpack requires argument");
3374                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3375                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3376                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3377                         av++;
3378                         break;
3379
3380                 case TOK_TCPWIN:
3381                         NEED1("tcpwin requires length");
3382                         fill_cmd(cmd, O_TCPWIN, 0,
3383                             htons(strtoul(*av, NULL, 0)));
3384                         av++;
3385                         break;
3386
3387                 case TOK_TCPFLAGS:
3388                         NEED1("missing argument for tcpflags");
3389                         cmd->opcode = O_TCPFLAGS;
3390                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3391                         av++;
3392                         break;
3393
3394                 case TOK_KEEPSTATE:
3395                         if (open_par)
3396                                 errx(EX_USAGE, "keep-state cannot be part "
3397                                     "of an or block");
3398                         if (have_state)
3399                                 errx(EX_USAGE, "only one of keep-state "
3400                                         "and limit is allowed");
3401                         have_state = cmd;
3402                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3403                         break;
3404
3405                 case TOK_LIMIT: {
3406                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3407                         int val;
3408
3409                         if (open_par)
3410                                 errx(EX_USAGE,
3411                                     "limit cannot be part of an or block");
3412                         if (have_state)
3413                                 errx(EX_USAGE, "only one of keep-state and "
3414                                     "limit is allowed");
3415                         have_state = cmd;
3416
3417                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3418                         cmd->opcode = O_LIMIT;
3419                         c->limit_mask = c->conn_limit = 0;
3420
3421                         while ( av[0] != NULL ) {
3422                                 if ((val = match_token(limit_masks, *av)) <= 0)
3423                                         break;
3424                                 c->limit_mask |= val;
3425                                 av++;
3426                         }
3427
3428                         if (c->limit_mask == 0)
3429                                 errx(EX_USAGE, "limit: missing limit mask");
3430
3431                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3432                             TOK_LIMIT, rule_options);
3433
3434                         av++;
3435                         break;
3436                 }
3437
3438                 case TOK_PROTO:
3439                         NEED1("missing protocol");
3440                         if (add_proto(cmd, *av, &proto)) {
3441                                 av++;
3442                         } else
3443                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3444                                     *av);
3445                         break;
3446
3447                 case TOK_SRCIP:
3448                         NEED1("missing source IP");
3449                         if (add_srcip(cmd, *av)) {
3450                                 av++;
3451                         }
3452                         break;
3453
3454                 case TOK_DSTIP:
3455                         NEED1("missing destination IP");
3456                         if (add_dstip(cmd, *av)) {
3457                                 av++;
3458                         }
3459                         break;
3460
3461                 case TOK_SRCIP6:
3462                         NEED1("missing source IP6");
3463                         if (add_srcip6(cmd, *av)) {
3464                                 av++;
3465                         }
3466                         break;
3467
3468                 case TOK_DSTIP6:
3469                         NEED1("missing destination IP6");
3470                         if (add_dstip6(cmd, *av)) {
3471                                 av++;
3472                         }
3473                         break;
3474
3475                 case TOK_SRCPORT:
3476                         NEED1("missing source port");
3477                         if (_substrcmp(*av, "any") == 0 ||
3478                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3479                                 av++;
3480                         } else
3481                                 errx(EX_DATAERR, "invalid source port %s", *av);
3482                         break;
3483
3484                 case TOK_DSTPORT:
3485                         NEED1("missing destination port");
3486                         if (_substrcmp(*av, "any") == 0 ||
3487                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3488                                 av++;
3489                         } else
3490                                 errx(EX_DATAERR, "invalid destination port %s",
3491                                     *av);
3492                         break;
3493
3494                 case TOK_MAC:
3495                         if (add_mac(cmd, av))
3496                                 av += 2;
3497                         break;
3498
3499                 case TOK_MACTYPE:
3500                         NEED1("missing mac type");
3501                         if (!add_mactype(cmd, *av))
3502                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3503                         av++;
3504                         break;
3505
3506                 case TOK_VERREVPATH:
3507                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3508                         break;
3509
3510                 case TOK_VERSRCREACH:
3511                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3512                         break;
3513
3514                 case TOK_ANTISPOOF:
3515                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3516                         break;
3517
3518                 case TOK_IPSEC:
3519                         fill_cmd(cmd, O_IPSEC, 0, 0);
3520                         break;
3521
3522                 case TOK_IPV6:
3523                         fill_cmd(cmd, O_IP6, 0, 0);
3524                         break;
3525
3526                 case TOK_IPV4:
3527                         fill_cmd(cmd, O_IP4, 0, 0);
3528                         break;
3529
3530                 case TOK_EXT6HDR:
3531                         fill_ext6hdr( cmd, *av );
3532                         av++;
3533                         break;
3534
3535                 case TOK_FLOWID:
3536                         if (proto != IPPROTO_IPV6 )
3537                                 errx( EX_USAGE, "flow-id filter is active "
3538                                     "only for ipv6 protocol\n");
3539                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3540                         av++;
3541                         break;
3542
3543                 case TOK_COMMENT:
3544                         fill_comment(cmd, av);
3545                         av[0]=NULL;
3546                         break;
3547
3548                 case TOK_TAGGED:
3549                         if (av[0] && strpbrk(*av, "-,")) {
3550                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3551                                         errx(EX_DATAERR, "tagged: invalid tag"
3552                                             " list: %s", *av);
3553                         }
3554                         else {
3555                                 uint16_t tag;
3556
3557                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3558                                     TOK_TAGGED, rule_options);
3559                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3560                         }
3561                         av++;
3562                         break;
3563
3564                 case TOK_FIB:
3565                         NEED1("fib requires fib number");
3566                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3567                         av++;
3568                         break;
3569                 case TOK_SOCKARG:
3570                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3571                         break;
3572
3573                 case TOK_LOOKUP: {
3574                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3575                         char *p;
3576                         int j;
3577
3578                         if (!av[0] || !av[1])
3579                                 errx(EX_USAGE, "format: lookup argument tablenum");
3580                         cmd->opcode = O_IP_DST_LOOKUP;
3581                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3582                         i = match_token(rule_options, *av);
3583                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3584                                 if (i == lookup_key[j])
3585                                         break;
3586                         }
3587                         if (lookup_key[j] <= 0)
3588                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3589                         __PAST_END(c->d, 1) = j; // i converted to option
3590                         av++;
3591                         cmd->arg1 = strtoul(*av, &p, 0);
3592                         if (p && *p)
3593                                 errx(EX_USAGE, "format: lookup argument tablenum");
3594                         av++;
3595                     }
3596                         break;
3597
3598                 default:
3599                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3600                 }
3601                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3602                         prev = cmd;
3603                         cmd = next_cmd(cmd);
3604                 }
3605         }
3606
3607 done:
3608         /*
3609          * Now copy stuff into the rule.
3610          * If we have a keep-state option, the first instruction
3611          * must be a PROBE_STATE (which is generated here).
3612          * If we have a LOG option, it was stored as the first command,
3613          * and now must be moved to the top of the action part.
3614          */
3615         dst = (ipfw_insn *)rule->cmd;
3616
3617         /*
3618          * First thing to write into the command stream is the match probability.
3619          */
3620         if (match_prob != 1) { /* 1 means always match */
3621                 dst->opcode = O_PROB;
3622                 dst->len = 2;
3623                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3624                 dst += dst->len;
3625         }
3626
3627         /*
3628          * generate O_PROBE_STATE if necessary
3629          */
3630         if (have_state && have_state->opcode != O_CHECK_STATE) {
3631                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3632                 dst = next_cmd(dst);
3633         }
3634
3635         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3636         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3637                 i = F_LEN(src);
3638
3639                 switch (src->opcode) {
3640                 case O_LOG:
3641                 case O_KEEP_STATE:
3642                 case O_LIMIT:
3643                 case O_ALTQ:
3644                 case O_TAG:
3645                         break;
3646                 default:
3647                         bcopy(src, dst, i * sizeof(uint32_t));
3648                         dst += i;
3649                 }
3650         }
3651
3652         /*
3653          * put back the have_state command as last opcode
3654          */
3655         if (have_state && have_state->opcode != O_CHECK_STATE) {
3656                 i = F_LEN(have_state);
3657                 bcopy(have_state, dst, i * sizeof(uint32_t));
3658                 dst += i;
3659         }
3660         /*
3661          * start action section
3662          */
3663         rule->act_ofs = dst - rule->cmd;
3664
3665         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3666         if (have_log) {
3667                 i = F_LEN(have_log);
3668                 bcopy(have_log, dst, i * sizeof(uint32_t));
3669                 dst += i;
3670         }
3671         if (have_altq) {
3672                 i = F_LEN(have_altq);
3673                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3674                 dst += i;
3675         }
3676         if (have_tag) {
3677                 i = F_LEN(have_tag);
3678                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3679                 dst += i;
3680         }
3681         /*
3682          * copy all other actions
3683          */
3684         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3685                 i = F_LEN(src);
3686                 bcopy(src, dst, i * sizeof(uint32_t));
3687                 dst += i;
3688         }
3689
3690         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3691         i = (char *)dst - (char *)rule;
3692         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3693                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3694         if (!co.do_quiet)
3695                 show_ipfw(rule, 0, 0);
3696 }
3697
3698 /*
3699  * clear the counters or the log counters.
3700  */
3701 void
3702 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3703 {
3704         uint32_t arg, saved_arg;
3705         int failed = EX_OK;
3706         char const *errstr;
3707         char const *name = optname ? "RESETLOG" : "ZERO";
3708
3709         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3710
3711         av++; ac--;
3712
3713         if (!ac) {
3714                 /* clear all entries */
3715                 if (do_cmd(optname, NULL, 0) < 0)
3716                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3717                 if (!co.do_quiet)
3718                         printf("%s.\n", optname == IP_FW_ZERO ?
3719                             "Accounting cleared":"Logging counts reset");
3720
3721                 return;
3722         }
3723
3724         while (ac) {
3725                 /* Rule number */
3726                 if (isdigit(**av)) {
3727                         arg = strtonum(*av, 0, 0xffff, &errstr);
3728                         if (errstr)
3729                                 errx(EX_DATAERR,
3730                                     "invalid rule number %s\n", *av);
3731                         saved_arg = arg;
3732                         if (co.use_set)
3733                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3734                         av++;
3735                         ac--;
3736                         if (do_cmd(optname, &arg, sizeof(arg))) {
3737                                 warn("rule %u: setsockopt(IP_FW_%s)",
3738                                     saved_arg, name);
3739                                 failed = EX_UNAVAILABLE;
3740                         } else if (!co.do_quiet)
3741                                 printf("Entry %d %s.\n", saved_arg,
3742                                     optname == IP_FW_ZERO ?
3743                                         "cleared" : "logging count reset");
3744                 } else {
3745                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3746                 }
3747         }
3748         if (failed != EX_OK)
3749                 exit(failed);
3750 }
3751
3752 void
3753 ipfw_flush(int force)
3754 {
3755         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3756
3757         if (!force && !co.do_quiet) { /* need to ask user */
3758                 int c;
3759
3760                 printf("Are you sure? [yn] ");
3761                 fflush(stdout);
3762                 do {
3763                         c = toupper(getc(stdin));
3764                         while (c != '\n' && getc(stdin) != '\n')
3765                                 if (feof(stdin))
3766                                         return; /* and do not flush */
3767                 } while (c != 'Y' && c != 'N');
3768                 printf("\n");
3769                 if (c == 'N')   /* user said no */
3770                         return;
3771         }
3772         if (co.do_pipe) {
3773                 dummynet_flush();
3774                 return;
3775         }
3776         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3777         if (co.use_set) {
3778                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3779                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3780                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3781         } else if (do_cmd(cmd, NULL, 0) < 0)
3782                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3783                     co.do_pipe ? "DUMMYNET" : "FW");
3784         if (!co.do_quiet)
3785                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3786 }
3787
3788
3789 static void table_list(ipfw_table_entry ent, int need_header);
3790
3791 /*
3792  * This one handles all table-related commands
3793  *      ipfw table N add addr[/masklen] [value]
3794  *      ipfw table N delete addr[/masklen]
3795  *      ipfw table {N | all} flush
3796  *      ipfw table {N | all} list
3797  */
3798 void
3799 ipfw_table_handler(int ac, char *av[])
3800 {
3801         ipfw_table_entry ent;
3802         int do_add;
3803         int is_all;
3804         size_t len;
3805         char *p;
3806         uint32_t a;
3807         uint32_t tables_max;
3808
3809         len = sizeof(tables_max);
3810         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3811                 NULL, 0) == -1) {
3812 #ifdef IPFW_TABLES_MAX
3813                 warn("Warn: Failed to get the max tables number via sysctl. "
3814                      "Using the compiled in defaults. \nThe reason was");
3815                 tables_max = IPFW_TABLES_MAX;
3816 #else
3817                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3818 #endif
3819         }
3820
3821         ac--; av++;
3822         if (ac && isdigit(**av)) {
3823                 ent.tbl = atoi(*av);
3824                 is_all = 0;
3825                 ac--; av++;
3826         } else if (ac && _substrcmp(*av, "all") == 0) {
3827                 ent.tbl = 0;
3828                 is_all = 1;
3829                 ac--; av++;
3830         } else
3831                 errx(EX_USAGE, "table number or 'all' keyword required");
3832         if (ent.tbl >= tables_max)
3833                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3834                         "value (%d)", tables_max - 1);
3835         NEED1("table needs command");
3836         if (is_all && _substrcmp(*av, "list") != 0
3837                    && _substrcmp(*av, "flush") != 0)
3838                 errx(EX_USAGE, "table number required");
3839
3840         if (_substrcmp(*av, "add") == 0 ||
3841             _substrcmp(*av, "delete") == 0) {
3842                 do_add = **av == 'a';
3843                 ac--; av++;
3844                 if (!ac)
3845                         errx(EX_USAGE, "IP address required");
3846                 p = strchr(*av, '/');
3847                 if (p) {
3848                         *p++ = '\0';
3849                         ent.masklen = atoi(p);
3850                         if (ent.masklen > 32)
3851                                 errx(EX_DATAERR, "bad width ``%s''", p);
3852                 } else
3853                         ent.masklen = 32;
3854                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3855                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3856                 ac--; av++;
3857                 if (do_add && ac) {
3858                         unsigned int tval;
3859                         /* isdigit is a bit of a hack here.. */
3860                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3861                                 ent.value = strtoul(*av, NULL, 0);
3862                         } else {
3863                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3864                                         /* The value must be stored in host order        *
3865                                          * so that the values < 65k can be distinguished */
3866                                         ent.value = ntohl(tval);
3867                                 } else {
3868                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3869                                 }
3870                         }
3871                 } else
3872                         ent.value = 0;
3873                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3874                     &ent, sizeof(ent)) < 0) {
3875                         /* If running silent, don't bomb out on these errors. */
3876                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3877                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3878                                     do_add ? "ADD" : "DEL");
3879                         /* In silent mode, react to a failed add by deleting */
3880                         if (do_add) {
3881                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3882                                 if (do_cmd(IP_FW_TABLE_ADD,
3883                                     &ent, sizeof(ent)) < 0)
3884                                         err(EX_OSERR,
3885                                             "setsockopt(IP_FW_TABLE_ADD)");
3886                         }
3887                 }
3888         } else if (_substrcmp(*av, "flush") == 0) {
3889                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3890                 do {
3891                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3892                             sizeof(ent.tbl)) < 0)
3893                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3894                 } while (++ent.tbl < a);
3895         } else if (_substrcmp(*av, "list") == 0) {
3896                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3897                 do {
3898                         table_list(ent, is_all);
3899                 } while (++ent.tbl < a);
3900         } else
3901                 errx(EX_USAGE, "invalid table command %s", *av);
3902 }
3903
3904 static void
3905 table_list(ipfw_table_entry ent, int need_header)
3906 {
3907         ipfw_table *tbl;
3908         socklen_t l;
3909         uint32_t a;
3910
3911         a = ent.tbl;
3912         l = sizeof(a);
3913         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3914                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3915
3916         /* If a is zero we have nothing to do, the table is empty. */
3917         if (a == 0)
3918                 return;
3919
3920         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3921         tbl = safe_calloc(1, l);
3922         tbl->tbl = ent.tbl;
3923         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3924                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3925         if (tbl->cnt && need_header)
3926                 printf("---table(%d)---\n", tbl->tbl);
3927         for (a = 0; a < tbl->cnt; a++) {
3928                 unsigned int tval;
3929                 tval = tbl->ent[a].value;
3930                 if (co.do_value_as_ip) {
3931                         char tbuf[128];
3932                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3933                                 &tbl->ent[a].addr), 127);
3934                         /* inet_ntoa expects network order */
3935                         tval = htonl(tval);
3936                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3937                                 inet_ntoa(*(struct in_addr *)&tval));
3938                 } else {
3939                         printf("%s/%u %u\n",
3940                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3941                                 tbl->ent[a].masklen, tval);
3942                 }
3943         }
3944         free(tbl);
3945 }