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 #include <stddef.h>     /* offsetof */
  46
  47 #include <net/ethernet.h>
  48 #include <net/if.h>             /* only IFNAMSIZ */
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>   /* only n_short, n_long */
  51 #include <netinet/ip.h>
  52 #include <netinet/ip_icmp.h>
  53 #include <netinet/ip_fw.h>
  54 #include <netinet/tcp.h>
  55 #include <arpa/inet.h>
  56
  57 struct cmdline_opts co; /* global options */
  58
  59 int resvd_set_number = RESVD_SET;
  60
  61 int ipfw_socket = -1;
  62
  63 #ifndef s6_addr32
  64 #define s6_addr32 __u6_addr.__u6_addr32
  65 #endif
  66
  67 #define CHECK_LENGTH(v, len) do {                               \
  68         if ((v) < (len))                                        \
  69                 errx(EX_DATAERR, "Rule too long");              \
  70         } while (0)
  71 /*
  72  * Check if we have enough space in cmd buffer. Note that since
  73  * first 8? u32 words are reserved by reserved header, full cmd
  74  * buffer can't be used, so we need to protect from buffer overrun
  75  * only. At the beginnig, cblen is less than actual buffer size by
  76  * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need
  77  * for checking small instructions fitting in given range.
  78  * We also (ab)use the fact that ipfw_insn is always the first field
  79  * for any custom instruction.
  80  */
  81 #define CHECK_CMDLEN    CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd))
  82
  83 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  84         if (!av[0])                                                     \
  85                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  86         if (_substrcmp(*av, "tablearg") == 0) {                         \
  87                 arg = IP_FW_TABLEARG;                                   \
  88                 break;                                                  \
  89         }                                                               \
  90                                                                         \
  91         {                                                               \
  92         long _xval;                                                     \
  93         char *end;                                                      \
  94                                                                         \
  95         _xval = strtol(*av, &end, 10);                                  \
  96                                                                         \
  97         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  98                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  99                     match_value(s_x, tok), *av);                        \
 100                                                                         \
 101         if (errno == ERANGE || _xval < min || _xval > max)              \
 102                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
 103                     match_value(s_x, tok), min, max, *av);              \
 104                                                                         \
 105         if (_xval == IP_FW_TABLEARG)                                    \
 106                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
 107                     match_value(s_x, tok), *av);                        \
 108         arg = _xval;                                                    \
 109         }                                                               \
 110 } while (0)
 111
 112 static void
 113 PRINT_UINT_ARG(const char *str, uint32_t arg)
 114 {
 115         if (str != NULL)
 116                 printf("%s",str);
 117         if (arg == IP_FW_TABLEARG)
 118                 printf("tablearg");
 119         else
 120                 printf("%u", arg);
 121 }
 122
 123 static struct _s_x f_tcpflags[] = {
 124         { "syn", TH_SYN },
 125         { "fin", TH_FIN },
 126         { "ack", TH_ACK },
 127         { "psh", TH_PUSH },
 128         { "rst", TH_RST },
 129         { "urg", TH_URG },
 130         { "tcp flag", 0 },
 131         { NULL, 0 }
 132 };
 133
 134 static struct _s_x f_tcpopts[] = {
 135         { "mss",        IP_FW_TCPOPT_MSS },
 136         { "maxseg",     IP_FW_TCPOPT_MSS },
 137         { "window",     IP_FW_TCPOPT_WINDOW },
 138         { "sack",       IP_FW_TCPOPT_SACK },
 139         { "ts",         IP_FW_TCPOPT_TS },
 140         { "timestamp",  IP_FW_TCPOPT_TS },
 141         { "cc",         IP_FW_TCPOPT_CC },
 142         { "tcp option", 0 },
 143         { NULL, 0 }
 144 };
 145
 146 /*
 147  * IP options span the range 0 to 255 so we need to remap them
 148  * (though in fact only the low 5 bits are significant).
 149  */
 150 static struct _s_x f_ipopts[] = {
 151         { "ssrr",       IP_FW_IPOPT_SSRR},
 152         { "lsrr",       IP_FW_IPOPT_LSRR},
 153         { "rr",         IP_FW_IPOPT_RR},
 154         { "ts",         IP_FW_IPOPT_TS},
 155         { "ip option",  0 },
 156         { NULL, 0 }
 157 };
 158
 159 static struct _s_x f_iptos[] = {
 160         { "lowdelay",   IPTOS_LOWDELAY},
 161         { "throughput", IPTOS_THROUGHPUT},
 162         { "reliability", IPTOS_RELIABILITY},
 163         { "mincost",    IPTOS_MINCOST},
 164         { "congestion", IPTOS_ECN_CE},
 165         { "ecntransport", IPTOS_ECN_ECT0},
 166         { "ip tos option", 0},
 167         { NULL, 0 }
 168 };
 169
 170 static struct _s_x f_ipdscp[] = {
 171         { "af11", IPTOS_DSCP_AF11 >> 2 },       /* 001010 */
 172         { "af12", IPTOS_DSCP_AF12 >> 2 },       /* 001100 */
 173         { "af13", IPTOS_DSCP_AF13 >> 2 },       /* 001110 */
 174         { "af21", IPTOS_DSCP_AF21 >> 2 },       /* 010010 */
 175         { "af22", IPTOS_DSCP_AF22 >> 2 },       /* 010100 */
 176         { "af23", IPTOS_DSCP_AF23 >> 2 },       /* 010110 */
 177         { "af31", IPTOS_DSCP_AF31 >> 2 },       /* 011010 */
 178         { "af32", IPTOS_DSCP_AF32 >> 2 },       /* 011100 */
 179         { "af33", IPTOS_DSCP_AF33 >> 2 },       /* 011110 */
 180         { "af41", IPTOS_DSCP_AF41 >> 2 },       /* 100010 */
 181         { "af42", IPTOS_DSCP_AF42 >> 2 },       /* 100100 */
 182         { "af43", IPTOS_DSCP_AF43 >> 2 },       /* 100110 */
 183         { "be", IPTOS_DSCP_CS0 >> 2 },  /* 000000 */
 184         { "ef", IPTOS_DSCP_EF >> 2 },   /* 101110 */
 185         { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */
 186         { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */
 187         { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */
 188         { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */
 189         { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */
 190         { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */
 191         { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */
 192         { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */
 193         { NULL, 0 }
 194 };
 195
 196 static struct _s_x limit_masks[] = {
 197         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 198         {"src-addr",    DYN_SRC_ADDR},
 199         {"src-port",    DYN_SRC_PORT},
 200         {"dst-addr",    DYN_DST_ADDR},
 201         {"dst-port",    DYN_DST_PORT},
 202         {NULL,          0}
 203 };
 204
 205 /*
 206  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 207  * This is only used in this code.
 208  */
 209 #define IPPROTO_ETHERTYPE       0x1000
 210 static struct _s_x ether_types[] = {
 211     /*
 212      * Note, we cannot use "-:&/" in the names because they are field
 213      * separators in the type specifications. Also, we use s = NULL as
 214      * end-delimiter, because a type of 0 can be legal.
 215      */
 216         { "ip",         0x0800 },
 217         { "ipv4",       0x0800 },
 218         { "ipv6",       0x86dd },
 219         { "arp",        0x0806 },
 220         { "rarp",       0x8035 },
 221         { "vlan",       0x8100 },
 222         { "loop",       0x9000 },
 223         { "trail",      0x1000 },
 224         { "at",         0x809b },
 225         { "atalk",      0x809b },
 226         { "aarp",       0x80f3 },
 227         { "pppoe_disc", 0x8863 },
 228         { "pppoe_sess", 0x8864 },
 229         { "ipx_8022",   0x00E0 },
 230         { "ipx_8023",   0x0000 },
 231         { "ipx_ii",     0x8137 },
 232         { "ipx_snap",   0x8137 },
 233         { "ipx",        0x8137 },
 234         { "ns",         0x0600 },
 235         { NULL,         0 }
 236 };
 237
 238
 239 static struct _s_x rule_actions[] = {
 240         { "accept",             TOK_ACCEPT },
 241         { "pass",               TOK_ACCEPT },
 242         { "allow",              TOK_ACCEPT },
 243         { "permit",             TOK_ACCEPT },
 244         { "count",              TOK_COUNT },
 245         { "pipe",               TOK_PIPE },
 246         { "queue",              TOK_QUEUE },
 247         { "divert",             TOK_DIVERT },
 248         { "tee",                TOK_TEE },
 249         { "netgraph",           TOK_NETGRAPH },
 250         { "ngtee",              TOK_NGTEE },
 251         { "fwd",                TOK_FORWARD },
 252         { "forward",            TOK_FORWARD },
 253         { "skipto",             TOK_SKIPTO },
 254         { "deny",               TOK_DENY },
 255         { "drop",               TOK_DENY },
 256         { "reject",             TOK_REJECT },
 257         { "reset6",             TOK_RESET6 },
 258         { "reset",              TOK_RESET },
 259         { "unreach6",           TOK_UNREACH6 },
 260         { "unreach",            TOK_UNREACH },
 261         { "check-state",        TOK_CHECKSTATE },
 262         { "//",                 TOK_COMMENT },
 263         { "nat",                TOK_NAT },
 264         { "reass",              TOK_REASS },
 265         { "setfib",             TOK_SETFIB },
 266         { "setdscp",            TOK_SETDSCP },
 267         { "call",               TOK_CALL },
 268         { "return",             TOK_RETURN },
 269         { NULL, 0 }     /* terminator */
 270 };
 271
 272 static struct _s_x rule_action_params[] = {
 273         { "altq",               TOK_ALTQ },
 274         { "log",                TOK_LOG },
 275         { "tag",                TOK_TAG },
 276         { "untag",              TOK_UNTAG },
 277         { NULL, 0 }     /* terminator */
 278 };
 279
 280 /*
 281  * The 'lookup' instruction accepts one of the following arguments.
 282  * -1 is a terminator for the list.
 283  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 284  */
 285 static int lookup_key[] = {
 286         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 287         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 288
 289 static struct _s_x rule_options[] = {
 290         { "tagged",             TOK_TAGGED },
 291         { "uid",                TOK_UID },
 292         { "gid",                TOK_GID },
 293         { "jail",               TOK_JAIL },
 294         { "in",                 TOK_IN },
 295         { "limit",              TOK_LIMIT },
 296         { "keep-state",         TOK_KEEPSTATE },
 297         { "bridged",            TOK_LAYER2 },
 298         { "layer2",             TOK_LAYER2 },
 299         { "out",                TOK_OUT },
 300         { "diverted",           TOK_DIVERTED },
 301         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 302         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 303         { "xmit",               TOK_XMIT },
 304         { "recv",               TOK_RECV },
 305         { "via",                TOK_VIA },
 306         { "fragment",           TOK_FRAG },
 307         { "frag",               TOK_FRAG },
 308         { "fib",                TOK_FIB },
 309         { "ipoptions",          TOK_IPOPTS },
 310         { "ipopts",             TOK_IPOPTS },
 311         { "iplen",              TOK_IPLEN },
 312         { "ipid",               TOK_IPID },
 313         { "ipprecedence",       TOK_IPPRECEDENCE },
 314         { "dscp",               TOK_DSCP },
 315         { "iptos",              TOK_IPTOS },
 316         { "ipttl",              TOK_IPTTL },
 317         { "ipversion",          TOK_IPVER },
 318         { "ipver",              TOK_IPVER },
 319         { "estab",              TOK_ESTAB },
 320         { "established",        TOK_ESTAB },
 321         { "setup",              TOK_SETUP },
 322         { "sockarg",            TOK_SOCKARG },
 323         { "tcpdatalen",         TOK_TCPDATALEN },
 324         { "tcpflags",           TOK_TCPFLAGS },
 325         { "tcpflgs",            TOK_TCPFLAGS },
 326         { "tcpoptions",         TOK_TCPOPTS },
 327         { "tcpopts",            TOK_TCPOPTS },
 328         { "tcpseq",             TOK_TCPSEQ },
 329         { "tcpack",             TOK_TCPACK },
 330         { "tcpwin",             TOK_TCPWIN },
 331         { "icmptype",           TOK_ICMPTYPES },
 332         { "icmptypes",          TOK_ICMPTYPES },
 333         { "dst-ip",             TOK_DSTIP },
 334         { "src-ip",             TOK_SRCIP },
 335         { "dst-port",           TOK_DSTPORT },
 336         { "src-port",           TOK_SRCPORT },
 337         { "proto",              TOK_PROTO },
 338         { "MAC",                TOK_MAC },
 339         { "mac",                TOK_MAC },
 340         { "mac-type",           TOK_MACTYPE },
 341         { "verrevpath",         TOK_VERREVPATH },
 342         { "versrcreach",        TOK_VERSRCREACH },
 343         { "antispoof",          TOK_ANTISPOOF },
 344         { "ipsec",              TOK_IPSEC },
 345         { "icmp6type",          TOK_ICMP6TYPES },
 346         { "icmp6types",         TOK_ICMP6TYPES },
 347         { "ext6hdr",            TOK_EXT6HDR},
 348         { "flow-id",            TOK_FLOWID},
 349         { "ipv6",               TOK_IPV6},
 350         { "ip6",                TOK_IPV6},
 351         { "ipv4",               TOK_IPV4},
 352         { "ip4",                TOK_IPV4},
 353         { "dst-ipv6",           TOK_DSTIP6},
 354         { "dst-ip6",            TOK_DSTIP6},
 355         { "src-ipv6",           TOK_SRCIP6},
 356         { "src-ip6",            TOK_SRCIP6},
 357         { "lookup",             TOK_LOOKUP},
 358         { "//",                 TOK_COMMENT },
 359
 360         { "not",                TOK_NOT },              /* pseudo option */
 361         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 362         { "or",                 TOK_OR },               /* pseudo option */
 363         { "|", /* escape */     TOK_OR },               /* pseudo option */
 364         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 365         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 366         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 367         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 368         { NULL, 0 }     /* terminator */
 369 };
 370
 371 /*
 372  * Helper routine to print a possibly unaligned uint64_t on
 373  * various platform. If width > 0, print the value with
 374  * the desired width, followed by a space;
 375  * otherwise, return the required width.
 376  */
 377 int
 378 pr_u64(uint64_t *pd, int width)
 379 {
 380 #ifdef TCC
 381 #define U64_FMT "I64"
 382 #else
 383 #define U64_FMT "llu"
 384 #endif
 385         uint64_t u;
 386         unsigned long long d;
 387
 388         bcopy (pd, &u, sizeof(u));
 389         d = u;
 390         return (width > 0) ?
 391                 printf("%*" U64_FMT " ", width, d) :
 392                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 393 #undef U64_FMT
 394 }
 395
 396 void *
 397 safe_calloc(size_t number, size_t size)
 398 {
 399         void *ret = calloc(number, size);
 400
 401         if (ret == NULL)
 402                 err(EX_OSERR, "calloc");
 403         return ret;
 404 }
 405
 406 void *
 407 safe_realloc(void *ptr, size_t size)
 408 {
 409         void *ret = realloc(ptr, size);
 410
 411         if (ret == NULL)
 412                 err(EX_OSERR, "realloc");
 413         return ret;
 414 }
 415
 416 /*
 417  * conditionally runs the command.
 418  * Selected options or negative -> getsockopt
 419  */
 420 int
 421 do_cmd(int optname, void *optval, uintptr_t optlen)
 422 {
 423         int i;
 424
 425         if (co.test_only)
 426                 return 0;
 427
 428         if (ipfw_socket == -1)
 429                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 430         if (ipfw_socket < 0)
 431                 err(EX_UNAVAILABLE, "socket");
 432
 433         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 434             optname == IP_FW_ADD || optname == IP_FW3 ||
 435             optname == IP_FW_NAT_GET_CONFIG ||
 436             optname < 0 ||
 437             optname == IP_FW_NAT_GET_LOG) {
 438                 if (optname < 0)
 439                         optname = -optname;
 440                 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval,
 441                         (socklen_t *)optlen);
 442         } else {
 443                 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen);
 444         }
 445         return i;
 446 }
 447
 448 /*
 449  * do_setcmd3 - pass ipfw control cmd to kernel
 450  * @optname: option name
 451  * @optval: pointer to option data
 452  * @optlen: option length
 453  *
 454  * Function encapsulates option value in IP_FW3 socket option
 455  * and calls setsockopt().
 456  * Function returns 0 on success or -1 otherwise.
 457  */
 458 static int
 459 do_setcmd3(int optname, void *optval, socklen_t optlen)
 460 {
 461         socklen_t len;
 462         ip_fw3_opheader *op3;
 463
 464         if (co.test_only)
 465                 return (0);
 466
 467         if (ipfw_socket == -1)
 468                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 469         if (ipfw_socket < 0)
 470                 err(EX_UNAVAILABLE, "socket");
 471
 472         len = sizeof(ip_fw3_opheader) + optlen;
 473         op3 = alloca(len);
 474         /* Zero reserved fields */
 475         memset(op3, 0, sizeof(ip_fw3_opheader));
 476         memcpy(op3 + 1, optval, optlen);
 477         op3->opcode = optname;
 478
 479         return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len);
 480 }
 481
 482 /**
 483  * match_token takes a table and a string, returns the value associated
 484  * with the string (-1 in case of failure).
 485  */
 486 int
 487 match_token(struct _s_x *table, char *string)
 488 {
 489         struct _s_x *pt;
 490         uint i = strlen(string);
 491
 492         for (pt = table ; i && pt->s != NULL ; pt++)
 493                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 494                         return pt->x;
 495         return -1;
 496 }
 497
 498 /**
 499  * match_value takes a table and a value, returns the string associated
 500  * with the value (NULL in case of failure).
 501  */
 502 char const *
 503 match_value(struct _s_x *p, int value)
 504 {
 505         for (; p->s != NULL; p++)
 506                 if (p->x == value)
 507                         return p->s;
 508         return NULL;
 509 }
 510
 511 /*
 512  * _substrcmp takes two strings and returns 1 if they do not match,
 513  * and 0 if they match exactly or the first string is a sub-string
 514  * of the second.  A warning is printed to stderr in the case that the
 515  * first string is a sub-string of the second.
 516  *
 517  * This function will be removed in the future through the usual
 518  * deprecation process.
 519  */
 520 int
 521 _substrcmp(const char *str1, const char* str2)
 522 {
 523
 524         if (strncmp(str1, str2, strlen(str1)) != 0)
 525                 return 1;
 526
 527         if (strlen(str1) != strlen(str2))
 528                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 529                     str1, str2);
 530         return 0;
 531 }
 532
 533 /*
 534  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 535  * and 0 if they match exactly or the second string is a sub-string
 536  * of the first.  A warning is printed to stderr in the case that the
 537  * first string does not match the third.
 538  *
 539  * This function exists to warn about the bizarre construction
 540  * strncmp(str, "by", 2) which is used to allow people to use a shortcut
 541  * for "bytes".  The problem is that in addition to accepting "by",
 542  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 543  * other string beginning with "by".
 544  *
 545  * This function will be removed in the future through the usual
 546  * deprecation process.
 547  */
 548 int
 549 _substrcmp2(const char *str1, const char* str2, const char* str3)
 550 {
 551
 552         if (strncmp(str1, str2, strlen(str2)) != 0)
 553                 return 1;
 554
 555         if (strcmp(str1, str3) != 0)
 556                 warnx("DEPRECATED: '%s' matched '%s'",
 557                     str1, str3);
 558         return 0;
 559 }
 560
 561 /*
 562  * prints one port, symbolic or numeric
 563  */
 564 static void
 565 print_port(int proto, uint16_t port)
 566 {
 567
 568         if (proto == IPPROTO_ETHERTYPE) {
 569                 char const *s;
 570
 571                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 572                         printf("%s", s);
 573                 else
 574                         printf("0x%04x", port);
 575         } else {
 576                 struct servent *se = NULL;
 577                 if (co.do_resolv) {
 578                         struct protoent *pe = getprotobynumber(proto);
 579
 580                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 581                 }
 582                 if (se)
 583                         printf("%s", se->s_name);
 584                 else
 585                         printf("%d", port);
 586         }
 587 }
 588
 589 static struct _s_x _port_name[] = {
 590         {"dst-port",    O_IP_DSTPORT},
 591         {"src-port",    O_IP_SRCPORT},
 592         {"ipid",        O_IPID},
 593         {"iplen",       O_IPLEN},
 594         {"ipttl",       O_IPTTL},
 595         {"mac-type",    O_MAC_TYPE},
 596         {"tcpdatalen",  O_TCPDATALEN},
 597         {"tcpwin",      O_TCPWIN},
 598         {"tagged",      O_TAGGED},
 599         {NULL,          0}
 600 };
 601
 602 /*
 603  * Print the values in a list 16-bit items of the types above.
 604  * XXX todo: add support for mask.
 605  */
 606 static void
 607 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 608 {
 609         uint16_t *p = cmd->ports;
 610         int i;
 611         char const *sep;
 612
 613         if (opcode != 0) {
 614                 sep = match_value(_port_name, opcode);
 615                 if (sep == NULL)
 616                         sep = "???";
 617                 printf (" %s", sep);
 618         }
 619         sep = " ";
 620         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 621                 printf("%s", sep);
 622                 print_port(proto, p[0]);
 623                 if (p[0] != p[1]) {
 624                         printf("-");
 625                         print_port(proto, p[1]);
 626                 }
 627                 sep = ",";
 628         }
 629 }
 630
 631 /*
 632  * Like strtol, but also translates service names into port numbers
 633  * for some protocols.
 634  * In particular:
 635  *      proto == -1 disables the protocol check;
 636  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 637  *      proto == <some value in /etc/protocols> matches the values there.
 638  * Returns *end == s in case the parameter is not found.
 639  */
 640 static int
 641 strtoport(char *s, char **end, int base, int proto)
 642 {
 643         char *p, *buf;
 644         char *s1;
 645         int i;
 646
 647         *end = s;               /* default - not found */
 648         if (*s == '\0')
 649                 return 0;       /* not found */
 650
 651         if (isdigit(*s))
 652                 return strtol(s, end, base);
 653
 654         /*
 655          * find separator. '\\' escapes the next char.
 656          */
 657         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 658                 if (*s1 == '\\' && s1[1] != '\0')
 659                         s1++;
 660
 661         buf = safe_calloc(s1 - s + 1, 1);
 662
 663         /*
 664          * copy into a buffer skipping backslashes
 665          */
 666         for (p = s, i = 0; p != s1 ; p++)
 667                 if (*p != '\\')
 668                         buf[i++] = *p;
 669         buf[i++] = '\0';
 670
 671         if (proto == IPPROTO_ETHERTYPE) {
 672                 i = match_token(ether_types, buf);
 673                 free(buf);
 674                 if (i != -1) {  /* found */
 675                         *end = s1;
 676                         return i;
 677                 }
 678         } else {
 679                 struct protoent *pe = NULL;
 680                 struct servent *se;
 681
 682                 if (proto != 0)
 683                         pe = getprotobynumber(proto);
 684                 setservent(1);
 685                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 686                 free(buf);
 687                 if (se != NULL) {
 688                         *end = s1;
 689                         return ntohs(se->s_port);
 690                 }
 691         }
 692         return 0;       /* not found */
 693 }
 694
 695 /*
 696  * Fill the body of the command with the list of port ranges.
 697  */
 698 static int
 699 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen)
 700 {
 701         uint16_t a, b, *p = cmd->ports;
 702         int i = 0;
 703         char *s = av;
 704
 705         while (*s) {
 706                 a = strtoport(av, &s, 0, proto);
 707                 if (s == av)                    /* empty or invalid argument */
 708                         return (0);
 709
 710                 CHECK_LENGTH(cblen, i + 2);
 711
 712                 switch (*s) {
 713                 case '-':                       /* a range */
 714                         av = s + 1;
 715                         b = strtoport(av, &s, 0, proto);
 716                         /* Reject expressions like '1-abc' or '1-2-3'. */
 717                         if (s == av || (*s != ',' && *s != '\0'))
 718                                 return (0);
 719                         p[0] = a;
 720                         p[1] = b;
 721                         break;
 722                 case ',':                       /* comma separated list */
 723                 case '\0':
 724                         p[0] = p[1] = a;
 725                         break;
 726                 default:
 727                         warnx("port list: invalid separator <%c> in <%s>",
 728                                 *s, av);
 729                         return (0);
 730                 }
 731
 732                 i++;
 733                 p += 2;
 734                 av = s + 1;
 735         }
 736         if (i > 0) {
 737                 if (i + 1 > F_LEN_MASK)
 738                         errx(EX_DATAERR, "too many ports/ranges\n");
 739                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 740         }
 741         return (i);
 742 }
 743
 744 /*
 745  * Fill the body of the command with the list of DiffServ codepoints.
 746  */
 747 static void
 748 fill_dscp(ipfw_insn *cmd, char *av, int cblen)
 749 {
 750         uint32_t *low, *high;
 751         char *s = av, *a;
 752         int code;
 753
 754         cmd->opcode = O_DSCP;
 755         cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1;
 756
 757         CHECK_CMDLEN;
 758
 759         low = (uint32_t *)(cmd + 1);
 760         high = low + 1;
 761
 762         *low = 0;
 763         *high = 0;
 764
 765         while (s != NULL) {
 766                 a = strchr(s, ',');
 767
 768                 if (a != NULL)
 769                         *a++ = '\0';
 770
 771                 if (isalpha(*s)) {
 772                         if ((code = match_token(f_ipdscp, s)) == -1)
 773                                 errx(EX_DATAERR, "Unknown DSCP code");
 774                 } else {
 775                         code = strtoul(s, NULL, 10);
 776                         if (code < 0 || code > 63)
 777                                 errx(EX_DATAERR, "Invalid DSCP value");
 778                 }
 779
 780                 if (code > 32)
 781                         *high |= 1 << (code - 32);
 782                 else
 783                         *low |= 1 << code;
 784
 785                 s = a;
 786         }
 787 }
 788
 789 static struct _s_x icmpcodes[] = {
 790       { "net",                  ICMP_UNREACH_NET },
 791       { "host",                 ICMP_UNREACH_HOST },
 792       { "protocol",             ICMP_UNREACH_PROTOCOL },
 793       { "port",                 ICMP_UNREACH_PORT },
 794       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 795       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 796       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 797       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 798       { "isolated",             ICMP_UNREACH_ISOLATED },
 799       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 800       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 801       { "tosnet",               ICMP_UNREACH_TOSNET },
 802       { "toshost",              ICMP_UNREACH_TOSHOST },
 803       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 804       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 805       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 806       { NULL, 0 }
 807 };
 808
 809 static void
 810 fill_reject_code(u_short *codep, char *str)
 811 {
 812         int val;
 813         char *s;
 814
 815         val = strtoul(str, &s, 0);
 816         if (s == str || *s != '\0' || val >= 0x100)
 817                 val = match_token(icmpcodes, str);
 818         if (val < 0)
 819                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 820         *codep = val;
 821         return;
 822 }
 823
 824 static void
 825 print_reject_code(uint16_t code)
 826 {
 827         char const *s = match_value(icmpcodes, code);
 828
 829         if (s != NULL)
 830                 printf("unreach %s", s);
 831         else
 832                 printf("unreach %u", code);
 833 }
 834
 835 /*
 836  * Returns the number of bits set (from left) in a contiguous bitmask,
 837  * or -1 if the mask is not contiguous.
 838  * XXX this needs a proper fix.
 839  * This effectively works on masks in big-endian (network) format.
 840  * when compiled on little endian architectures.
 841  *
 842  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 843  * the first bit on the wire is bit 0 of the first byte.
 844  * len is the max length in bits.
 845  */
 846 int
 847 contigmask(uint8_t *p, int len)
 848 {
 849         int i, n;
 850
 851         for (i=0; i<len ; i++)
 852                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 853                         break;
 854         for (n=i+1; n < len; n++)
 855                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 856                         return -1; /* mask not contiguous */
 857         return i;
 858 }
 859
 860 /*
 861  * print flags set/clear in the two bitmasks passed as parameters.
 862  * There is a specialized check for f_tcpflags.
 863  */
 864 static void
 865 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 866 {
 867         char const *comma = "";
 868         int i;
 869         uint8_t set = cmd->arg1 & 0xff;
 870         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 871
 872         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 873                 printf(" setup");
 874                 return;
 875         }
 876
 877         printf(" %s ", name);
 878         for (i=0; list[i].x != 0; i++) {
 879                 if (set & list[i].x) {
 880                         set &= ~list[i].x;
 881                         printf("%s%s", comma, list[i].s);
 882                         comma = ",";
 883                 }
 884                 if (clear & list[i].x) {
 885                         clear &= ~list[i].x;
 886                         printf("%s!%s", comma, list[i].s);
 887                         comma = ",";
 888                 }
 889         }
 890 }
 891
 892 /*
 893  * Print the ip address contained in a command.
 894  */
 895 static void
 896 print_ip(ipfw_insn_ip *cmd, char const *s)
 897 {
 898         struct hostent *he = NULL;
 899         uint32_t len = F_LEN((ipfw_insn *)cmd);
 900         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 901
 902         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 903                 uint32_t d = a[1];
 904                 const char *arg = "<invalid>";
 905
 906                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 907                         arg = match_value(rule_options, lookup_key[d]);
 908                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 909                         arg, cmd->o.arg1);
 910                 return;
 911         }
 912         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 913
 914         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 915                 printf("me");
 916                 return;
 917         }
 918         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 919             cmd->o.opcode == O_IP_DST_LOOKUP) {
 920                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 921                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 922                         printf(",%u", *a);
 923                 printf(")");
 924                 return;
 925         }
 926         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 927                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 928                 int i, j;
 929                 char comma = '{';
 930
 931                 x = cmd->o.arg1 - 1;
 932                 x = htonl( ~x );
 933                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 934                 printf("%s/%d", inet_ntoa(cmd->addr),
 935                         contigmask((uint8_t *)&x, 32));
 936                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 937                 x &= 0xff; /* base */
 938                 /*
 939                  * Print bits and ranges.
 940                  * Locate first bit set (i), then locate first bit unset (j).
 941                  * If we have 3+ consecutive bits set, then print them as a
 942                  * range, otherwise only print the initial bit and rescan.
 943                  */
 944                 for (i=0; i < cmd->o.arg1; i++)
 945                         if (map[i/32] & (1<<(i & 31))) {
 946                                 for (j=i+1; j < cmd->o.arg1; j++)
 947                                         if (!(map[ j/32] & (1<<(j & 31))))
 948                                                 break;
 949                                 printf("%c%d", comma, i+x);
 950                                 if (j>i+2) { /* range has at least 3 elements */
 951                                         printf("-%d", j-1+x);
 952                                         i = j-1;
 953                                 }
 954                                 comma = ',';
 955                         }
 956                 printf("}");
 957                 return;
 958         }
 959         /*
 960          * len == 2 indicates a single IP, whereas lists of 1 or more
 961          * addr/mask pairs have len = (2n+1). We convert len to n so we
 962          * use that to count the number of entries.
 963          */
 964     for (len = len / 2; len > 0; len--, a += 2) {
 965         int mb =        /* mask length */
 966             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 967                 32 : contigmask((uint8_t *)&(a[1]), 32);
 968         if (mb == 32 && co.do_resolv)
 969                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 970         if (he != NULL)         /* resolved to name */
 971                 printf("%s", he->h_name);
 972         else if (mb == 0)       /* any */
 973                 printf("any");
 974         else {          /* numeric IP followed by some kind of mask */
 975                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 976                 if (mb < 0)
 977                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 978                 else if (mb < 32)
 979                         printf("/%d", mb);
 980         }
 981         if (len > 1)
 982                 printf(",");
 983     }
 984 }
 985
 986 /*
 987  * prints a MAC address/mask pair
 988  */
 989 static void
 990 print_mac(uint8_t *addr, uint8_t *mask)
 991 {
 992         int l = contigmask(mask, 48);
 993
 994         if (l == 0)
 995                 printf(" any");
 996         else {
 997                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 998                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 999                 if (l == -1)
1000                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
1001                             mask[0], mask[1], mask[2],
1002                             mask[3], mask[4], mask[5]);
1003                 else if (l < 48)
1004                         printf("/%d", l);
1005         }
1006 }
1007
1008 static void
1009 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
1010 {
1011         uint8_t type;
1012
1013         cmd->d[0] = 0;
1014         while (*av) {
1015                 if (*av == ',')
1016                         av++;
1017
1018                 type = strtoul(av, &av, 0);
1019
1020                 if (*av != ',' && *av != '\0')
1021                         errx(EX_DATAERR, "invalid ICMP type");
1022
1023                 if (type > 31)
1024                         errx(EX_DATAERR, "ICMP type out of range");
1025
1026                 cmd->d[0] |= 1 << type;
1027         }
1028         cmd->o.opcode = O_ICMPTYPE;
1029         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1030 }
1031
1032 static void
1033 print_icmptypes(ipfw_insn_u32 *cmd)
1034 {
1035         int i;
1036         char sep= ' ';
1037
1038         printf(" icmptypes");
1039         for (i = 0; i < 32; i++) {
1040                 if ( (cmd->d[0] & (1 << (i))) == 0)
1041                         continue;
1042                 printf("%c%d", sep, i);
1043                 sep = ',';
1044         }
1045 }
1046
1047 static void
1048 print_dscp(ipfw_insn_u32 *cmd)
1049 {
1050         int i, c;
1051         uint32_t *v;
1052         char sep= ' ';
1053         const char *code;
1054
1055         printf(" dscp");
1056         i = 0;
1057         c = 0;
1058         v = cmd->d;
1059         while (i < 64) {
1060                 if (*v & (1 << i)) {
1061                         if ((code = match_value(f_ipdscp, i)) != NULL)
1062                                 printf("%c%s", sep, code);
1063                         else
1064                                 printf("%c%d", sep, i);
1065                         sep = ',';
1066                 }
1067
1068                 if ((++i % 32) == 0)
1069                         v++;
1070         }
1071 }
1072
1073 /*
1074  * show_ipfw() prints the body of an ipfw rule.
1075  * Because the standard rule has at least proto src_ip dst_ip, we use
1076  * a helper function to produce these entries if not provided explicitly.
1077  * The first argument is the list of fields we have, the second is
1078  * the list of fields we want to be printed.
1079  *
1080  * Special cases if we have provided a MAC header:
1081  *   + if the rule does not contain IP addresses/ports, do not print them;
1082  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
1083  *
1084  * Once we have 'have_options', IP header fields are printed as options.
1085  */
1086 #define HAVE_PROTO      0x0001
1087 #define HAVE_SRCIP      0x0002
1088 #define HAVE_DSTIP      0x0004
1089 #define HAVE_PROTO4     0x0008
1090 #define HAVE_PROTO6     0x0010
1091 #define HAVE_IP         0x0100
1092 #define HAVE_OPTIONS    0x8000
1093
1094 static void
1095 show_prerequisites(int *flags, int want, int cmd)
1096 {
1097         (void)cmd;      /* UNUSED */
1098         if (co.comment_only)
1099                 return;
1100         if ( (*flags & HAVE_IP) == HAVE_IP)
1101                 *flags |= HAVE_OPTIONS;
1102
1103         if ( !(*flags & HAVE_OPTIONS)) {
1104                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
1105                         if ( (*flags & HAVE_PROTO4))
1106                                 printf(" ip4");
1107                         else if ( (*flags & HAVE_PROTO6))
1108                                 printf(" ip6");
1109                         else
1110                                 printf(" ip");
1111                 }
1112                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
1113                         printf(" from any");
1114                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
1115                         printf(" to any");
1116         }
1117         *flags |= want;
1118 }
1119
1120 static void
1121 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
1122 {
1123         static int twidth = 0;
1124         int l;
1125         ipfw_insn *cmd, *tagptr = NULL;
1126         const char *comment = NULL;     /* ptr to comment if we have one */
1127         int proto = 0;          /* default */
1128         int flags = 0;  /* prerequisites */
1129         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
1130         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
1131         int or_block = 0;       /* we are in an or block */
1132         uint32_t set_disable;
1133
1134         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
1135
1136         if (set_disable & (1 << rule->set)) { /* disabled */
1137                 if (!co.show_sets)
1138                         return;
1139                 else
1140                         printf("# DISABLED ");
1141         }
1142         printf("%05u ", rule->rulenum);
1143
1144         if (pcwidth > 0 || bcwidth > 0) {
1145                 pr_u64(&rule->pcnt, pcwidth);
1146                 pr_u64(&rule->bcnt, bcwidth);
1147         }
1148
1149         if (co.do_time == 2)
1150                 printf("%10u ", rule->timestamp);
1151         else if (co.do_time == 1) {
1152                 char timestr[30];
1153                 time_t t = (time_t)0;
1154
1155                 if (twidth == 0) {
1156                         strcpy(timestr, ctime(&t));
1157                         *strchr(timestr, '\n') = '\0';
1158                         twidth = strlen(timestr);
1159                 }
1160                 if (rule->timestamp) {
1161                         t = _long_to_time(rule->timestamp);
1162
1163                         strcpy(timestr, ctime(&t));
1164                         *strchr(timestr, '\n') = '\0';
1165                         printf("%s ", timestr);
1166                 } else {
1167                         printf("%*s", twidth, " ");
1168                 }
1169         }
1170
1171         if (co.show_sets)
1172                 printf("set %d ", rule->set);
1173
1174         /*
1175          * print the optional "match probability"
1176          */
1177         if (rule->cmd_len > 0) {
1178                 cmd = rule->cmd ;
1179                 if (cmd->opcode == O_PROB) {
1180                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1181                         double d = 1.0 * p->d[0];
1182
1183                         d = (d / 0x7fffffff);
1184                         printf("prob %f ", d);
1185                 }
1186         }
1187
1188         /*
1189          * first print actions
1190          */
1191         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1192                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1193                 switch(cmd->opcode) {
1194                 case O_CHECK_STATE:
1195                         printf("check-state");
1196                         /* avoid printing anything else */
1197                         flags = HAVE_PROTO | HAVE_SRCIP |
1198                                 HAVE_DSTIP | HAVE_IP;
1199                         break;
1200
1201                 case O_ACCEPT:
1202                         printf("allow");
1203                         break;
1204
1205                 case O_COUNT:
1206                         printf("count");
1207                         break;
1208
1209                 case O_DENY:
1210                         printf("deny");
1211                         break;
1212
1213                 case O_REJECT:
1214                         if (cmd->arg1 == ICMP_REJECT_RST)
1215                                 printf("reset");
1216                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1217                                 printf("reject");
1218                         else
1219                                 print_reject_code(cmd->arg1);
1220                         break;
1221
1222                 case O_UNREACH6:
1223                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1224                                 printf("reset6");
1225                         else
1226                                 print_unreach6_code(cmd->arg1);
1227                         break;
1228
1229                 case O_SKIPTO:
1230                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1231                         break;
1232
1233                 case O_PIPE:
1234                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1235                         break;
1236
1237                 case O_QUEUE:
1238                         PRINT_UINT_ARG("queue ", cmd->arg1);
1239                         break;
1240
1241                 case O_DIVERT:
1242                         PRINT_UINT_ARG("divert ", cmd->arg1);
1243                         break;
1244
1245                 case O_TEE:
1246                         PRINT_UINT_ARG("tee ", cmd->arg1);
1247                         break;
1248
1249                 case O_NETGRAPH:
1250                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1251                         break;
1252
1253                 case O_NGTEE:
1254                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1255                         break;
1256
1257                 case O_FORWARD_IP:
1258                     {
1259                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1260
1261                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1262                                 printf("fwd tablearg");
1263                         } else {
1264                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1265                         }
1266                         if (s->sa.sin_port)
1267                                 printf(",%d", s->sa.sin_port);
1268                     }
1269                         break;
1270
1271                 case O_FORWARD_IP6:
1272                     {
1273                         char buf[4 + INET6_ADDRSTRLEN + 1];
1274                         ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd;
1275
1276                         printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr,
1277                             buf, sizeof(buf)));
1278                         if (s->sa.sin6_port)
1279                                 printf(",%d", s->sa.sin6_port);
1280                     }
1281                         break;
1282
1283                 case O_LOG: /* O_LOG is printed last */
1284                         logptr = (ipfw_insn_log *)cmd;
1285                         break;
1286
1287                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1288                         altqptr = (ipfw_insn_altq *)cmd;
1289                         break;
1290
1291                 case O_TAG:
1292                         tagptr = cmd;
1293                         break;
1294
1295                 case O_NAT:
1296                         if (cmd->arg1 != 0)
1297                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1298                         else
1299                                 printf("nat global");
1300                         break;
1301
1302                 case O_SETFIB:
1303                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1304                         break;
1305
1306                 case O_SETDSCP:
1307                     {
1308                         const char *code;
1309
1310                         if ((code = match_value(f_ipdscp, cmd->arg1)) != NULL)
1311                                 printf("setdscp %s", code);
1312                         else
1313                                 PRINT_UINT_ARG("setdscp ", cmd->arg1);
1314                     }
1315                         break;
1316
1317                 case O_REASS:
1318                         printf("reass");
1319                         break;
1320
1321                 case O_CALLRETURN:
1322                         if (cmd->len & F_NOT)
1323                                 printf("return");
1324                         else
1325                                 PRINT_UINT_ARG("call ", cmd->arg1);
1326                         break;
1327
1328                 default:
1329                         printf("** unrecognized action %d len %d ",
1330                                 cmd->opcode, cmd->len);
1331                 }
1332         }
1333         if (logptr) {
1334                 if (logptr->max_log > 0)
1335                         printf(" log logamount %d", logptr->max_log);
1336                 else
1337                         printf(" log");
1338         }
1339 #ifndef NO_ALTQ
1340         if (altqptr) {
1341                 print_altq_cmd(altqptr);
1342         }
1343 #endif
1344         if (tagptr) {
1345                 if (tagptr->len & F_NOT)
1346                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1347                 else
1348                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1349         }
1350
1351         /*
1352          * then print the body.
1353          */
1354         for (l = rule->act_ofs, cmd = rule->cmd ;
1355                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1356                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1357                         continue;
1358                 if (cmd->opcode == O_IP4) {
1359                         flags |= HAVE_PROTO4;
1360                         break;
1361                 } else if (cmd->opcode == O_IP6) {
1362                         flags |= HAVE_PROTO6;
1363                         break;
1364                 }
1365         }
1366         if (rule->_pad & 1) {   /* empty rules before options */
1367                 if (!co.do_compact) {
1368                         show_prerequisites(&flags, HAVE_PROTO, 0);
1369                         printf(" from any to any");
1370                 }
1371                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1372                          HAVE_SRCIP | HAVE_DSTIP;
1373         }
1374
1375         if (co.comment_only)
1376                 comment = "...";
1377
1378         for (l = rule->act_ofs, cmd = rule->cmd ;
1379                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1380                 /* useful alias */
1381                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1382
1383                 if (co.comment_only) {
1384                         if (cmd->opcode != O_NOP)
1385                                 continue;
1386                         printf(" // %s\n", (char *)(cmd + 1));
1387                         return;
1388                 }
1389
1390                 show_prerequisites(&flags, 0, cmd->opcode);
1391
1392                 switch(cmd->opcode) {
1393                 case O_PROB:
1394                         break;  /* done already */
1395
1396                 case O_PROBE_STATE:
1397                         break; /* no need to print anything here */
1398
1399                 case O_IP_SRC:
1400                 case O_IP_SRC_LOOKUP:
1401                 case O_IP_SRC_MASK:
1402                 case O_IP_SRC_ME:
1403                 case O_IP_SRC_SET:
1404                         show_prerequisites(&flags, HAVE_PROTO, 0);
1405                         if (!(flags & HAVE_SRCIP))
1406                                 printf(" from");
1407                         if ((cmd->len & F_OR) && !or_block)
1408                                 printf(" {");
1409                         print_ip((ipfw_insn_ip *)cmd,
1410                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1411                         flags |= HAVE_SRCIP;
1412                         break;
1413
1414                 case O_IP_DST:
1415                 case O_IP_DST_LOOKUP:
1416                 case O_IP_DST_MASK:
1417                 case O_IP_DST_ME:
1418                 case O_IP_DST_SET:
1419                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1420                         if (!(flags & HAVE_DSTIP))
1421                                 printf(" to");
1422                         if ((cmd->len & F_OR) && !or_block)
1423                                 printf(" {");
1424                         print_ip((ipfw_insn_ip *)cmd,
1425                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1426                         flags |= HAVE_DSTIP;
1427                         break;
1428
1429                 case O_IP6_SRC:
1430                 case O_IP6_SRC_MASK:
1431                 case O_IP6_SRC_ME:
1432                         show_prerequisites(&flags, HAVE_PROTO, 0);
1433                         if (!(flags & HAVE_SRCIP))
1434                                 printf(" from");
1435                         if ((cmd->len & F_OR) && !or_block)
1436                                 printf(" {");
1437                         print_ip6((ipfw_insn_ip6 *)cmd,
1438                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1439                         flags |= HAVE_SRCIP | HAVE_PROTO;
1440                         break;
1441
1442                 case O_IP6_DST:
1443                 case O_IP6_DST_MASK:
1444                 case O_IP6_DST_ME:
1445                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1446                         if (!(flags & HAVE_DSTIP))
1447                                 printf(" to");
1448                         if ((cmd->len & F_OR) && !or_block)
1449                                 printf(" {");
1450                         print_ip6((ipfw_insn_ip6 *)cmd,
1451                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1452                         flags |= HAVE_DSTIP;
1453                         break;
1454
1455                 case O_FLOW6ID:
1456                 print_flow6id( (ipfw_insn_u32 *) cmd );
1457                 flags |= HAVE_OPTIONS;
1458                 break;
1459
1460                 case O_IP_DSTPORT:
1461                         show_prerequisites(&flags,
1462                                 HAVE_PROTO | HAVE_SRCIP |
1463                                 HAVE_DSTIP | HAVE_IP, 0);
1464                 case O_IP_SRCPORT:
1465                         if (flags & HAVE_DSTIP)
1466                                 flags |= HAVE_IP;
1467                         show_prerequisites(&flags,
1468                                 HAVE_PROTO | HAVE_SRCIP, 0);
1469                         if ((cmd->len & F_OR) && !or_block)
1470                                 printf(" {");
1471                         if (cmd->len & F_NOT)
1472                                 printf(" not");
1473                         print_newports((ipfw_insn_u16 *)cmd, proto,
1474                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1475                         break;
1476
1477                 case O_PROTO: {
1478                         struct protoent *pe = NULL;
1479
1480                         if ((cmd->len & F_OR) && !or_block)
1481                                 printf(" {");
1482                         if (cmd->len & F_NOT)
1483                                 printf(" not");
1484                         proto = cmd->arg1;
1485                         pe = getprotobynumber(cmd->arg1);
1486                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1487                             !(flags & HAVE_PROTO))
1488                                 show_prerequisites(&flags,
1489                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1490                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1491                         if (flags & HAVE_OPTIONS)
1492                                 printf(" proto");
1493                         if (pe)
1494                                 printf(" %s", pe->p_name);
1495                         else
1496                                 printf(" %u", cmd->arg1);
1497                         }
1498                         flags |= HAVE_PROTO;
1499                         break;
1500
1501                 default: /*options ... */
1502                         if (!(cmd->len & (F_OR|F_NOT)))
1503                                 if (((cmd->opcode == O_IP6) &&
1504                                     (flags & HAVE_PROTO6)) ||
1505                                     ((cmd->opcode == O_IP4) &&
1506                                     (flags & HAVE_PROTO4)))
1507                                         break;
1508                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1509                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1510                         if ((cmd->len & F_OR) && !or_block)
1511                                 printf(" {");
1512                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1513                                 printf(" not");
1514                         switch(cmd->opcode) {
1515                         case O_MACADDR2: {
1516                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1517
1518                                 printf(" MAC");
1519                                 print_mac(m->addr, m->mask);
1520                                 print_mac(m->addr + 6, m->mask + 6);
1521                                 }
1522                                 break;
1523
1524                         case O_MAC_TYPE:
1525                                 print_newports((ipfw_insn_u16 *)cmd,
1526                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1527                                 break;
1528
1529
1530                         case O_FRAG:
1531                                 printf(" frag");
1532                                 break;
1533
1534                         case O_FIB:
1535                                 printf(" fib %u", cmd->arg1 );
1536                                 break;
1537                         case O_SOCKARG:
1538                                 printf(" sockarg");
1539                                 break;
1540
1541                         case O_IN:
1542                                 printf(cmd->len & F_NOT ? " out" : " in");
1543                                 break;
1544
1545                         case O_DIVERTED:
1546                                 switch (cmd->arg1) {
1547                                 case 3:
1548                                         printf(" diverted");
1549                                         break;
1550                                 case 1:
1551                                         printf(" diverted-loopback");
1552                                         break;
1553                                 case 2:
1554                                         printf(" diverted-output");
1555                                         break;
1556                                 default:
1557                                         printf(" diverted-?<%u>", cmd->arg1);
1558                                         break;
1559                                 }
1560                                 break;
1561
1562                         case O_LAYER2:
1563                                 printf(" layer2");
1564                                 break;
1565                         case O_XMIT:
1566                         case O_RECV:
1567                         case O_VIA:
1568                             {
1569                                 char const *s;
1570                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1571
1572                                 if (cmd->opcode == O_XMIT)
1573                                         s = "xmit";
1574                                 else if (cmd->opcode == O_RECV)
1575                                         s = "recv";
1576                                 else /* if (cmd->opcode == O_VIA) */
1577                                         s = "via";
1578                                 if (cmdif->name[0] == '\0')
1579                                         printf(" %s %s", s,
1580                                             inet_ntoa(cmdif->p.ip));
1581                                 else if (cmdif->name[0] == '\1') /* interface table */
1582                                         printf(" %s table(%d)", s, cmdif->p.glob);
1583                                 else
1584                                         printf(" %s %s", s, cmdif->name);
1585
1586                                 break;
1587                             }
1588                         case O_IPID:
1589                                 if (F_LEN(cmd) == 1)
1590                                     printf(" ipid %u", cmd->arg1 );
1591                                 else
1592                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1593                                         O_IPID);
1594                                 break;
1595
1596                         case O_IPTTL:
1597                                 if (F_LEN(cmd) == 1)
1598                                     printf(" ipttl %u", cmd->arg1 );
1599                                 else
1600                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1601                                         O_IPTTL);
1602                                 break;
1603
1604                         case O_IPVER:
1605                                 printf(" ipver %u", cmd->arg1 );
1606                                 break;
1607
1608                         case O_IPPRECEDENCE:
1609                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1610                                 break;
1611
1612                         case O_DSCP:
1613                                 print_dscp((ipfw_insn_u32 *)cmd);
1614                                 break;
1615
1616                         case O_IPLEN:
1617                                 if (F_LEN(cmd) == 1)
1618                                     printf(" iplen %u", cmd->arg1 );
1619                                 else
1620                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1621                                         O_IPLEN);
1622                                 break;
1623
1624                         case O_IPOPT:
1625                                 print_flags("ipoptions", cmd, f_ipopts);
1626                                 break;
1627
1628                         case O_IPTOS:
1629                                 print_flags("iptos", cmd, f_iptos);
1630                                 break;
1631
1632                         case O_ICMPTYPE:
1633                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1634                                 break;
1635
1636                         case O_ESTAB:
1637                                 printf(" established");
1638                                 break;
1639
1640                         case O_TCPDATALEN:
1641                                 if (F_LEN(cmd) == 1)
1642                                     printf(" tcpdatalen %u", cmd->arg1 );
1643                                 else
1644                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1645                                         O_TCPDATALEN);
1646                                 break;
1647
1648                         case O_TCPFLAGS:
1649                                 print_flags("tcpflags", cmd, f_tcpflags);
1650                                 break;
1651
1652                         case O_TCPOPTS:
1653                                 print_flags("tcpoptions", cmd, f_tcpopts);
1654                                 break;
1655
1656                         case O_TCPWIN:
1657                                 if (F_LEN(cmd) == 1)
1658                                     printf(" tcpwin %u", cmd->arg1);
1659                                 else
1660                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1661                                         O_TCPWIN);
1662                                 break;
1663
1664                         case O_TCPACK:
1665                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1666                                 break;
1667
1668                         case O_TCPSEQ:
1669                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1670                                 break;
1671
1672                         case O_UID:
1673                             {
1674                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1675
1676                                 if (pwd)
1677                                         printf(" uid %s", pwd->pw_name);
1678                                 else
1679                                         printf(" uid %u", cmd32->d[0]);
1680                             }
1681                                 break;
1682
1683                         case O_GID:
1684                             {
1685                                 struct group *grp = getgrgid(cmd32->d[0]);
1686
1687                                 if (grp)
1688                                         printf(" gid %s", grp->gr_name);
1689                                 else
1690                                         printf(" gid %u", cmd32->d[0]);
1691                             }
1692                                 break;
1693
1694                         case O_JAIL:
1695                                 printf(" jail %d", cmd32->d[0]);
1696                                 break;
1697
1698                         case O_VERREVPATH:
1699                                 printf(" verrevpath");
1700                                 break;
1701
1702                         case O_VERSRCREACH:
1703                                 printf(" versrcreach");
1704                                 break;
1705
1706                         case O_ANTISPOOF:
1707                                 printf(" antispoof");
1708                                 break;
1709
1710                         case O_IPSEC:
1711                                 printf(" ipsec");
1712                                 break;
1713
1714                         case O_NOP:
1715                                 comment = (char *)(cmd + 1);
1716                                 break;
1717
1718                         case O_KEEP_STATE:
1719                                 printf(" keep-state");
1720                                 break;
1721
1722                         case O_LIMIT: {
1723                                 struct _s_x *p = limit_masks;
1724                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1725                                 uint8_t x = c->limit_mask;
1726                                 char const *comma = " ";
1727
1728                                 printf(" limit");
1729                                 for (; p->x != 0 ; p++)
1730                                         if ((x & p->x) == p->x) {
1731                                                 x &= ~p->x;
1732                                                 printf("%s%s", comma, p->s);
1733                                                 comma = ",";
1734                                         }
1735                                 PRINT_UINT_ARG(" ", c->conn_limit);
1736                                 break;
1737                         }
1738
1739                         case O_IP6:
1740                                 printf(" ip6");
1741                                 break;
1742
1743                         case O_IP4:
1744                                 printf(" ip4");
1745                                 break;
1746
1747                         case O_ICMP6TYPE:
1748                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1749                                 break;
1750
1751                         case O_EXT_HDR:
1752                                 print_ext6hdr( (ipfw_insn *) cmd );
1753                                 break;
1754
1755                         case O_TAGGED:
1756                                 if (F_LEN(cmd) == 1)
1757                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1758                                 else
1759                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1760                                             O_TAGGED);
1761                                 break;
1762
1763                         default:
1764                                 printf(" [opcode %d len %d]",
1765                                     cmd->opcode, cmd->len);
1766                         }
1767                 }
1768                 if (cmd->len & F_OR) {
1769                         printf(" or");
1770                         or_block = 1;
1771                 } else if (or_block) {
1772                         printf(" }");
1773                         or_block = 0;
1774                 }
1775         }
1776         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1777                                               | HAVE_IP, 0);
1778         if (comment)
1779                 printf(" // %s", comment);
1780         printf("\n");
1781 }
1782
1783 static void
1784 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1785 {
1786         struct protoent *pe;
1787         struct in_addr a;
1788         uint16_t rulenum;
1789         char buf[INET6_ADDRSTRLEN];
1790
1791         if (!co.do_expired) {
1792                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1793                         return;
1794         }
1795         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1796         printf("%05d", rulenum);
1797         if (pcwidth > 0 || bcwidth > 0) {
1798                 printf(" ");
1799                 pr_u64(&d->pcnt, pcwidth);
1800                 pr_u64(&d->bcnt, bcwidth);
1801                 printf("(%ds)", d->expire);
1802         }
1803         switch (d->dyn_type) {
1804         case O_LIMIT_PARENT:
1805                 printf(" PARENT %d", d->count);
1806                 break;
1807         case O_LIMIT:
1808                 printf(" LIMIT");
1809                 break;
1810         case O_KEEP_STATE: /* bidir, no mask */
1811                 printf(" STATE");
1812                 break;
1813         }
1814
1815         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1816                 printf(" %s", pe->p_name);
1817         else
1818                 printf(" proto %u", d->id.proto);
1819
1820         if (d->id.addr_type == 4) {
1821                 a.s_addr = htonl(d->id.src_ip);
1822                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1823
1824                 a.s_addr = htonl(d->id.dst_ip);
1825                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1826         } else if (d->id.addr_type == 6) {
1827                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1828                     sizeof(buf)), d->id.src_port);
1829                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1830                     sizeof(buf)), d->id.dst_port);
1831         } else
1832                 printf(" UNKNOWN <-> UNKNOWN\n");
1833
1834         printf("\n");
1835 }
1836
1837 /*
1838  * This one handles all set-related commands
1839  *      ipfw set { show | enable | disable }
1840  *      ipfw set swap X Y
1841  *      ipfw set move X to Y
1842  *      ipfw set move rule X to Y
1843  */
1844 void
1845 ipfw_sets_handler(char *av[])
1846 {
1847         uint32_t set_disable, masks[2];
1848         int i, nbytes;
1849         uint16_t rulenum;
1850         uint8_t cmd, new_set;
1851
1852         av++;
1853
1854         if (av[0] == NULL)
1855                 errx(EX_USAGE, "set needs command");
1856         if (_substrcmp(*av, "show") == 0) {
1857                 void *data = NULL;
1858                 char const *msg;
1859                 int nalloc;
1860
1861                 nalloc = nbytes = sizeof(struct ip_fw);
1862                 while (nbytes >= nalloc) {
1863                         if (data)
1864                                 free(data);
1865                         nalloc = nalloc * 2 + 200;
1866                         nbytes = nalloc;
1867                         data = safe_calloc(1, nbytes);
1868                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1869                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1870                 }
1871
1872                 bcopy(&((struct ip_fw *)data)->next_rule,
1873                         &set_disable, sizeof(set_disable));
1874
1875                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1876                         if ((set_disable & (1<<i))) {
1877                                 printf("%s %d", msg, i);
1878                                 msg = "";
1879                         }
1880                 msg = (set_disable) ? " enable" : "enable";
1881                 for (i = 0; i < RESVD_SET; i++)
1882                         if (!(set_disable & (1<<i))) {
1883                                 printf("%s %d", msg, i);
1884                                 msg = "";
1885                         }
1886                 printf("\n");
1887         } else if (_substrcmp(*av, "swap") == 0) {
1888                 av++;
1889                 if ( av[0] == NULL || av[1] == NULL )
1890                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1891                 rulenum = atoi(av[0]);
1892                 new_set = atoi(av[1]);
1893                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1894                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1895                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1896                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1897                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1898                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1899         } else if (_substrcmp(*av, "move") == 0) {
1900                 av++;
1901                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1902                         cmd = 2;
1903                         av++;
1904                 } else
1905                         cmd = 3;
1906                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1907                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1908                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1909                 rulenum = atoi(av[0]);
1910                 new_set = atoi(av[2]);
1911                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1912                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1913                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1914                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1915                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1916                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1917                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1918         } else if (_substrcmp(*av, "disable") == 0 ||
1919                    _substrcmp(*av, "enable") == 0 ) {
1920                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1921
1922                 av++;
1923                 masks[0] = masks[1] = 0;
1924
1925                 while (av[0]) {
1926                         if (isdigit(**av)) {
1927                                 i = atoi(*av);
1928                                 if (i < 0 || i > RESVD_SET)
1929                                         errx(EX_DATAERR,
1930                                             "invalid set number %d\n", i);
1931                                 masks[which] |= (1<<i);
1932                         } else if (_substrcmp(*av, "disable") == 0)
1933                                 which = 0;
1934                         else if (_substrcmp(*av, "enable") == 0)
1935                                 which = 1;
1936                         else
1937                                 errx(EX_DATAERR,
1938                                         "invalid set command %s\n", *av);
1939                         av++;
1940                 }
1941                 if ( (masks[0] & masks[1]) != 0 )
1942                         errx(EX_DATAERR,
1943                             "cannot enable and disable the same set\n");
1944
1945                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1946                 if (i)
1947                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1948         } else
1949                 errx(EX_USAGE, "invalid set command %s\n", *av);
1950 }
1951
1952 void
1953 ipfw_sysctl_handler(char *av[], int which)
1954 {
1955         av++;
1956
1957         if (av[0] == NULL) {
1958                 warnx("missing keyword to enable/disable\n");
1959         } else if (_substrcmp(*av, "firewall") == 0) {
1960                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1961                     &which, sizeof(which));
1962                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1963                     &which, sizeof(which));
1964         } else if (_substrcmp(*av, "one_pass") == 0) {
1965                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1966                     &which, sizeof(which));
1967         } else if (_substrcmp(*av, "debug") == 0) {
1968                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1969                     &which, sizeof(which));
1970         } else if (_substrcmp(*av, "verbose") == 0) {
1971                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1972                     &which, sizeof(which));
1973         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1974                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1975                     &which, sizeof(which));
1976 #ifndef NO_ALTQ
1977         } else if (_substrcmp(*av, "altq") == 0) {
1978                 altq_set_enabled(which);
1979 #endif
1980         } else {
1981                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1982         }
1983 }
1984
1985 void
1986 ipfw_list(int ac, char *av[], int show_counters)
1987 {
1988         struct ip_fw *r;
1989         ipfw_dyn_rule *dynrules, *d;
1990
1991 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1992         char *lim;
1993         void *data = NULL;
1994         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1995         int exitval = EX_OK;
1996         int lac;
1997         char **lav;
1998         u_long rnum, last;
1999         char *endptr;
2000         int seen = 0;
2001         uint8_t set;
2002
2003         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
2004         int nalloc = 1024;      /* start somewhere... */
2005
2006         last = 0;
2007
2008         if (co.test_only) {
2009                 fprintf(stderr, "Testing only, list disabled\n");
2010                 return;
2011         }
2012         if (co.do_pipe) {
2013                 dummynet_list(ac, av, show_counters);
2014                 return;
2015         }
2016
2017         ac--;
2018         av++;
2019
2020         /* get rules or pipes from kernel, resizing array as necessary */
2021         nbytes = nalloc;
2022
2023         while (nbytes >= nalloc) {
2024                 nalloc = nalloc * 2 + 200;
2025                 nbytes = nalloc;
2026                 data = safe_realloc(data, nbytes);
2027                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
2028                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
2029                                 co.do_pipe ? "DUMMYNET" : "FW");
2030         }
2031
2032         /*
2033          * Count static rules. They have variable size so we
2034          * need to scan the list to count them.
2035          */
2036         for (nstat = 1, r = data, lim = (char *)data + nbytes;
2037                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
2038                     ++nstat, r = NEXT(r) )
2039                 ; /* nothing */
2040
2041         /*
2042          * Count dynamic rules. This is easier as they have
2043          * fixed size.
2044          */
2045         r = NEXT(r);
2046         dynrules = (ipfw_dyn_rule *)r ;
2047         n = (char *)r - (char *)data;
2048         ndyn = (nbytes - n) / sizeof *dynrules;
2049
2050         /* if showing stats, figure out column widths ahead of time */
2051         bcwidth = pcwidth = 0;
2052         if (show_counters) {
2053                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
2054                         /* skip rules from another set */
2055                         if (co.use_set && r->set != co.use_set - 1)
2056                                 continue;
2057
2058                         /* packet counter */
2059                         width = pr_u64(&r->pcnt, 0);
2060                         if (width > pcwidth)
2061                                 pcwidth = width;
2062
2063                         /* byte counter */
2064                         width = pr_u64(&r->bcnt, 0);
2065                         if (width > bcwidth)
2066                                 bcwidth = width;
2067                 }
2068         }
2069         if (co.do_dynamic && ndyn) {
2070                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2071                         if (co.use_set) {
2072                                 /* skip rules from another set */
2073                                 bcopy((char *)&d->rule + sizeof(uint16_t),
2074                                       &set, sizeof(uint8_t));
2075                                 if (set != co.use_set - 1)
2076                                         continue;
2077                         }
2078                         width = pr_u64(&d->pcnt, 0);
2079                         if (width > pcwidth)
2080                                 pcwidth = width;
2081
2082                         width = pr_u64(&d->bcnt, 0);
2083                         if (width > bcwidth)
2084                                 bcwidth = width;
2085                 }
2086         }
2087         /* if no rule numbers were specified, list all rules */
2088         if (ac == 0) {
2089                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
2090                         if (co.use_set && r->set != co.use_set - 1)
2091                                 continue;
2092                         show_ipfw(r, pcwidth, bcwidth);
2093                 }
2094
2095                 if (co.do_dynamic && ndyn) {
2096                         printf("## Dynamic rules (%d):\n", ndyn);
2097                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2098                                 if (co.use_set) {
2099                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2100                                               &set, sizeof(uint8_t));
2101                                         if (set != co.use_set - 1)
2102                                                 continue;
2103                                 }
2104                                 show_dyn_ipfw(d, pcwidth, bcwidth);
2105                 }
2106                 }
2107                 goto done;
2108         }
2109
2110         /* display specific rules requested on command line */
2111
2112         for (lac = ac, lav = av; lac != 0; lac--) {
2113                 /* convert command line rule # */
2114                 last = rnum = strtoul(*lav++, &endptr, 10);
2115                 if (*endptr == '-')
2116                         last = strtoul(endptr+1, &endptr, 10);
2117                 if (*endptr) {
2118                         exitval = EX_USAGE;
2119                         warnx("invalid rule number: %s", *(lav - 1));
2120                         continue;
2121                 }
2122                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
2123                         if (r->rulenum > last)
2124                                 break;
2125                         if (co.use_set && r->set != co.use_set - 1)
2126                                 continue;
2127                         if (r->rulenum >= rnum && r->rulenum <= last) {
2128                                 show_ipfw(r, pcwidth, bcwidth);
2129                                 seen = 1;
2130                         }
2131                 }
2132                 if (!seen) {
2133                         /* give precedence to other error(s) */
2134                         if (exitval == EX_OK)
2135                                 exitval = EX_UNAVAILABLE;
2136                         warnx("rule %lu does not exist", rnum);
2137                 }
2138         }
2139
2140         if (co.do_dynamic && ndyn) {
2141                 printf("## Dynamic rules:\n");
2142                 for (lac = ac, lav = av; lac != 0; lac--) {
2143                         last = rnum = strtoul(*lav++, &endptr, 10);
2144                         if (*endptr == '-')
2145                                 last = strtoul(endptr+1, &endptr, 10);
2146                         if (*endptr)
2147                                 /* already warned */
2148                                 continue;
2149                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2150                                 uint16_t rulenum;
2151
2152                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
2153                                 if (rulenum > rnum)
2154                                         break;
2155                                 if (co.use_set) {
2156                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2157                                               &set, sizeof(uint8_t));
2158                                         if (set != co.use_set - 1)
2159                                                 continue;
2160                                 }
2161                                 if (r->rulenum >= rnum && r->rulenum <= last)
2162                                         show_dyn_ipfw(d, pcwidth, bcwidth);
2163                         }
2164                 }
2165         }
2166
2167         ac = 0;
2168
2169 done:
2170         free(data);
2171
2172         if (exitval != EX_OK)
2173                 exit(exitval);
2174 #undef NEXT
2175 }
2176
2177 static int
2178 lookup_host (char *host, struct in_addr *ipaddr)
2179 {
2180         struct hostent *he;
2181
2182         if (!inet_aton(host, ipaddr)) {
2183                 if ((he = gethostbyname(host)) == NULL)
2184                         return(-1);
2185                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
2186         }
2187         return(0);
2188 }
2189
2190 /*
2191  * fills the addr and mask fields in the instruction as appropriate from av.
2192  * Update length as appropriate.
2193  * The following formats are allowed:
2194  *      me      returns O_IP_*_ME
2195  *      1.2.3.4         single IP address
2196  *      1.2.3.4:5.6.7.8 address:mask
2197  *      1.2.3.4/24      address/mask
2198  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2199  * We can have multiple comma-separated address/mask entries.
2200  */
2201 static void
2202 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen)
2203 {
2204         int len = 0;
2205         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2206
2207         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2208
2209         if (_substrcmp(av, "any") == 0)
2210                 return;
2211
2212         if (_substrcmp(av, "me") == 0) {
2213                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2214                 return;
2215         }
2216
2217         if (strncmp(av, "table(", 6) == 0) {
2218                 char *p = strchr(av + 6, ',');
2219
2220                 if (p)
2221                         *p++ = '\0';
2222                 cmd->o.opcode = O_IP_DST_LOOKUP;
2223                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2224                 if (p) {
2225                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2226                         d[0] = strtoul(p, NULL, 0);
2227                 } else
2228                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2229                 return;
2230         }
2231
2232     while (av) {
2233         /*
2234          * After the address we can have '/' or ':' indicating a mask,
2235          * ',' indicating another address follows, '{' indicating a
2236          * set of addresses of unspecified size.
2237          */
2238         char *t = NULL, *p = strpbrk(av, "/:,{");
2239         int masklen;
2240         char md, nd = '\0';
2241
2242         CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len);
2243
2244         if (p) {
2245                 md = *p;
2246                 *p++ = '\0';
2247                 if ((t = strpbrk(p, ",{")) != NULL) {
2248                         nd = *t;
2249                         *t = '\0';
2250                 }
2251         } else
2252                 md = '\0';
2253
2254         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2255                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2256         switch (md) {
2257         case ':':
2258                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2259                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2260                 break;
2261         case '/':
2262                 masklen = atoi(p);
2263                 if (masklen == 0)
2264                         d[1] = htonl(0);        /* mask */
2265                 else if (masklen > 32)
2266                         errx(EX_DATAERR, "bad width ``%s''", p);
2267                 else
2268                         d[1] = htonl(~0 << (32 - masklen));
2269                 break;
2270         case '{':       /* no mask, assume /24 and put back the '{' */
2271                 d[1] = htonl(~0 << (32 - 24));
2272                 *(--p) = md;
2273                 break;
2274
2275         case ',':       /* single address plus continuation */
2276                 *(--p) = md;
2277                 /* FALLTHROUGH */
2278         case 0:         /* initialization value */
2279         default:
2280                 d[1] = htonl(~0);       /* force /32 */
2281                 break;
2282         }
2283         d[0] &= d[1];           /* mask base address with mask */
2284         if (t)
2285                 *t = nd;
2286         /* find next separator */
2287         if (p)
2288                 p = strpbrk(p, ",{");
2289         if (p && *p == '{') {
2290                 /*
2291                  * We have a set of addresses. They are stored as follows:
2292                  *   arg1       is the set size (powers of 2, 2..256)
2293                  *   addr       is the base address IN HOST FORMAT
2294                  *   mask..     is an array of arg1 bits (rounded up to
2295                  *              the next multiple of 32) with bits set
2296                  *              for each host in the map.
2297                  */
2298                 uint32_t *map = (uint32_t *)&cmd->mask;
2299                 int low, high;
2300                 int i = contigmask((uint8_t *)&(d[1]), 32);
2301
2302                 if (len > 0)
2303                         errx(EX_DATAERR, "address set cannot be in a list");
2304                 if (i < 24 || i > 31)
2305                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2306                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2307                 d[0] = ntohl(d[0]);             /* base addr in host format */
2308                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2309                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2310                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2311                         map[i] = 0;     /* clear map */
2312
2313                 av = p + 1;
2314                 low = d[0] & 0xff;
2315                 high = low + cmd->o.arg1 - 1;
2316                 /*
2317                  * Here, i stores the previous value when we specify a range
2318                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2319                  * have no previous value.
2320                  */
2321                 i = -1; /* previous value in a range */
2322                 while (isdigit(*av)) {
2323                         char *s;
2324                         int a = strtol(av, &s, 0);
2325
2326                         if (s == av) { /* no parameter */
2327                             if (*av != '}')
2328                                 errx(EX_DATAERR, "set not closed\n");
2329                             if (i != -1)
2330                                 errx(EX_DATAERR, "incomplete range %d-", i);
2331                             break;
2332                         }
2333                         if (a < low || a > high)
2334                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2335                                 a, low, high);
2336                         a -= low;
2337                         if (i == -1)    /* no previous in range */
2338                             i = a;
2339                         else {          /* check that range is valid */
2340                             if (i > a)
2341                                 errx(EX_DATAERR, "invalid range %d-%d",
2342                                         i+low, a+low);
2343                             if (*s == '-')
2344                                 errx(EX_DATAERR, "double '-' in range");
2345                         }
2346                         for (; i <= a; i++)
2347                             map[i/32] |= 1<<(i & 31);
2348                         i = -1;
2349                         if (*s == '-')
2350                             i = a;
2351                         else if (*s == '}')
2352                             break;
2353                         av = s+1;
2354                 }
2355                 return;
2356         }
2357         av = p;
2358         if (av)                 /* then *av must be a ',' */
2359                 av++;
2360
2361         /* Check this entry */
2362         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2363                 /*
2364                  * 'any' turns the entire list into a NOP.
2365                  * 'not any' never matches, so it is removed from the
2366                  * list unless it is the only item, in which case we
2367                  * report an error.
2368                  */
2369                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2370                         if (av == NULL && len == 0) /* only this entry */
2371                                 errx(EX_DATAERR, "not any never matches");
2372                 }
2373                 /* else do nothing and skip this entry */
2374                 return;
2375         }
2376         /* A single IP can be stored in an optimized format */
2377         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2378                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2379                 return;
2380         }
2381         len += 2;       /* two words... */
2382         d += 2;
2383     } /* end while */
2384     if (len + 1 > F_LEN_MASK)
2385         errx(EX_DATAERR, "address list too long");
2386     cmd->o.len |= len+1;
2387 }
2388
2389
2390 /* n2mask sets n bits of the mask */
2391 void
2392 n2mask(struct in6_addr *mask, int n)
2393 {
2394         static int      minimask[9] =
2395             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2396         u_char          *p;
2397
2398         memset(mask, 0, sizeof(struct in6_addr));
2399         p = (u_char *) mask;
2400         for (; n > 0; p++, n -= 8) {
2401                 if (n >= 8)
2402                         *p = 0xff;
2403                 else
2404                         *p = minimask[n];
2405         }
2406         return;
2407 }
2408
2409 /*
2410  * helper function to process a set of flags and set bits in the
2411  * appropriate masks.
2412  */
2413 static void
2414 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2415         struct _s_x *flags, char *p)
2416 {
2417         uint8_t set=0, clear=0;
2418
2419         while (p && *p) {
2420                 char *q;        /* points to the separator */
2421                 int val;
2422                 uint8_t *which; /* mask we are working on */
2423
2424                 if (*p == '!') {
2425                         p++;
2426                         which = &clear;
2427                 } else
2428                         which = &set;
2429                 q = strchr(p, ',');
2430                 if (q)
2431                         *q++ = '\0';
2432                 val = match_token(flags, p);
2433                 if (val <= 0)
2434                         errx(EX_DATAERR, "invalid flag %s", p);
2435                 *which |= (uint8_t)val;
2436                 p = q;
2437         }
2438         cmd->opcode = opcode;
2439         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2440         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2441 }
2442
2443
2444 void
2445 ipfw_delete(char *av[])
2446 {
2447         uint32_t rulenum;
2448         int i;
2449         int exitval = EX_OK;
2450         int do_set = 0;
2451
2452         av++;
2453         NEED1("missing rule specification");
2454         if ( *av && _substrcmp(*av, "set") == 0) {
2455                 /* Do not allow using the following syntax:
2456                  *      ipfw set N delete set M
2457                  */
2458                 if (co.use_set)
2459                         errx(EX_DATAERR, "invalid syntax");
2460                 do_set = 1;     /* delete set */
2461                 av++;
2462         }
2463
2464         /* Rule number */
2465         while (*av && isdigit(**av)) {
2466                 i = atoi(*av); av++;
2467                 if (co.do_nat) {
2468                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2469                         if (exitval) {
2470                                 exitval = EX_UNAVAILABLE;
2471                                 warn("rule %u not available", i);
2472                         }
2473                 } else if (co.do_pipe) {
2474                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2475                 } else {
2476                         if (co.use_set)
2477                                 rulenum = (i & 0xffff) | (5 << 24) |
2478                                     ((co.use_set - 1) << 16);
2479                         else
2480                         rulenum =  (i & 0xffff) | (do_set << 24);
2481                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2482                         if (i) {
2483                                 exitval = EX_UNAVAILABLE;
2484                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2485                                     rulenum);
2486                         }
2487                 }
2488         }
2489         if (exitval != EX_OK)
2490                 exit(exitval);
2491 }
2492
2493
2494 /*
2495  * fill the interface structure. We do not check the name as we can
2496  * create interfaces dynamically, so checking them at insert time
2497  * makes relatively little sense.
2498  * Interface names containing '*', '?', or '[' are assumed to be shell
2499  * patterns which match interfaces.
2500  */
2501 static void
2502 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen)
2503 {
2504         cmd->name[0] = '\0';
2505         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2506
2507         CHECK_CMDLEN;
2508
2509         /* Parse the interface or address */
2510         if (strcmp(arg, "any") == 0)
2511                 cmd->o.len = 0;         /* effectively ignore this command */
2512         else if (strncmp(arg, "table(", 6) == 0) {
2513                 char *p = strchr(arg + 6, ',');
2514                 if (p)
2515                         *p++ = '\0';
2516                 cmd->name[0] = '\1'; /* Special value indicating table */
2517                 cmd->p.glob = strtoul(arg + 6, NULL, 0);
2518         } else if (!isdigit(*arg)) {
2519                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2520                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2521         } else if (!inet_aton(arg, &cmd->p.ip))
2522                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2523 }
2524
2525 static void
2526 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2527 {
2528         int i;
2529         size_t l;
2530         char *ap, *ptr, *optr;
2531         struct ether_addr *mac;
2532         const char *macset = "0123456789abcdefABCDEF:";
2533
2534         if (strcmp(p, "any") == 0) {
2535                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2536                         addr[i] = mask[i] = 0;
2537                 return;
2538         }
2539
2540         optr = ptr = strdup(p);
2541         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2542                 l = strlen(ap);
2543                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2544                         errx(EX_DATAERR, "Incorrect MAC address");
2545                 bcopy(mac, addr, ETHER_ADDR_LEN);
2546         } else
2547                 errx(EX_DATAERR, "Incorrect MAC address");
2548
2549         if (ptr != NULL) { /* we have mask? */
2550                 if (p[ptr - optr - 1] == '/') { /* mask len */
2551                         long ml = strtol(ptr, &ap, 10);
2552                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2553                                 errx(EX_DATAERR, "Incorrect mask length");
2554                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2555                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2556                 } else { /* mask */
2557                         l = strlen(ptr);
2558                         if (strspn(ptr, macset) != l ||
2559                             (mac = ether_aton(ptr)) == NULL)
2560                                 errx(EX_DATAERR, "Incorrect mask");
2561                         bcopy(mac, mask, ETHER_ADDR_LEN);
2562                 }
2563         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2564                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2565                         mask[i] = 0xff;
2566         }
2567         for (i = 0; i < ETHER_ADDR_LEN; i++)
2568                 addr[i] &= mask[i];
2569
2570         free(optr);
2571 }
2572
2573 /*
2574  * helper function, updates the pointer to cmd with the length
2575  * of the current command, and also cleans up the first word of
2576  * the new command in case it has been clobbered before.
2577  */
2578 static ipfw_insn *
2579 next_cmd(ipfw_insn *cmd, int *len)
2580 {
2581         *len -= F_LEN(cmd);
2582         CHECK_LENGTH(*len, 0);
2583         cmd += F_LEN(cmd);
2584         bzero(cmd, sizeof(*cmd));
2585         return cmd;
2586 }
2587
2588 /*
2589  * Takes arguments and copies them into a comment
2590  */
2591 static void
2592 fill_comment(ipfw_insn *cmd, char **av, int cblen)
2593 {
2594         int i, l;
2595         char *p = (char *)(cmd + 1);
2596
2597         cmd->opcode = O_NOP;
2598         cmd->len =  (cmd->len & (F_NOT | F_OR));
2599
2600         /* Compute length of comment string. */
2601         for (i = 0, l = 0; av[i] != NULL; i++)
2602                 l += strlen(av[i]) + 1;
2603         if (l == 0)
2604                 return;
2605         if (l > 84)
2606                 errx(EX_DATAERR,
2607                     "comment too long (max 80 chars)");
2608         l = 1 + (l+3)/4;
2609         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2610         CHECK_CMDLEN;
2611
2612         for (i = 0; av[i] != NULL; i++) {
2613                 strcpy(p, av[i]);
2614                 p += strlen(av[i]);
2615                 *p++ = ' ';
2616         }
2617         *(--p) = '\0';
2618 }
2619
2620 /*
2621  * A function to fill simple commands of size 1.
2622  * Existing flags are preserved.
2623  */
2624 static void
2625 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2626 {
2627         cmd->opcode = opcode;
2628         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2629         cmd->arg1 = arg;
2630 }
2631
2632 /*
2633  * Fetch and add the MAC address and type, with masks. This generates one or
2634  * two microinstructions, and returns the pointer to the last one.
2635  */
2636 static ipfw_insn *
2637 add_mac(ipfw_insn *cmd, char *av[], int cblen)
2638 {
2639         ipfw_insn_mac *mac;
2640
2641         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2642                 errx(EX_DATAERR, "MAC dst src");
2643
2644         cmd->opcode = O_MACADDR2;
2645         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2646         CHECK_CMDLEN;
2647
2648         mac = (ipfw_insn_mac *)cmd;
2649         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2650         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2651             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2652         return cmd;
2653 }
2654
2655 static ipfw_insn *
2656 add_mactype(ipfw_insn *cmd, char *av, int cblen)
2657 {
2658         if (!av)
2659                 errx(EX_DATAERR, "missing MAC type");
2660         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2661                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE,
2662                     cblen);
2663                 cmd->opcode = O_MAC_TYPE;
2664                 return cmd;
2665         } else
2666                 return NULL;
2667 }
2668
2669 static ipfw_insn *
2670 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2671 {
2672         struct protoent *pe;
2673         char *ep;
2674         int proto;
2675
2676         proto = strtol(av, &ep, 10);
2677         if (*ep != '\0' || proto <= 0) {
2678                 if ((pe = getprotobyname(av)) == NULL)
2679                         return NULL;
2680                 proto = pe->p_proto;
2681         }
2682
2683         fill_cmd(cmd, O_PROTO, 0, proto);
2684         *protop = proto;
2685         return cmd;
2686 }
2687
2688 static ipfw_insn *
2689 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2690 {
2691         u_char proto = IPPROTO_IP;
2692
2693         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2694                 ; /* do not set O_IP4 nor O_IP6 */
2695         else if (strcmp(av, "ip4") == 0)
2696                 /* explicit "just IPv4" rule */
2697                 fill_cmd(cmd, O_IP4, 0, 0);
2698         else if (strcmp(av, "ip6") == 0) {
2699                 /* explicit "just IPv6" rule */
2700                 proto = IPPROTO_IPV6;
2701                 fill_cmd(cmd, O_IP6, 0, 0);
2702         } else
2703                 return add_proto0(cmd, av, protop);
2704
2705         *protop = proto;
2706         return cmd;
2707 }
2708
2709 static ipfw_insn *
2710 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2711 {
2712         u_char proto = IPPROTO_IP;
2713
2714         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2715                 ; /* do not set O_IP4 nor O_IP6 */
2716         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2717                 /* explicit "just IPv4" rule */
2718                 fill_cmd(cmd, O_IP4, 0, 0);
2719         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2720                 /* explicit "just IPv6" rule */
2721                 proto = IPPROTO_IPV6;
2722                 fill_cmd(cmd, O_IP6, 0, 0);
2723         } else
2724                 return add_proto0(cmd, av, protop);
2725
2726         *protop = proto;
2727         return cmd;
2728 }
2729
2730 static ipfw_insn *
2731 add_srcip(ipfw_insn *cmd, char *av, int cblen)
2732 {
2733         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2734         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2735                 cmd->opcode = O_IP_SRC_SET;
2736         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2737                 cmd->opcode = O_IP_SRC_LOOKUP;
2738         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2739                 cmd->opcode = O_IP_SRC_ME;
2740         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2741                 cmd->opcode = O_IP_SRC;
2742         else                                                    /* addr/mask */
2743                 cmd->opcode = O_IP_SRC_MASK;
2744         return cmd;
2745 }
2746
2747 static ipfw_insn *
2748 add_dstip(ipfw_insn *cmd, char *av, int cblen)
2749 {
2750         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2751         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2752                 ;
2753         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2754                 ;
2755         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2756                 cmd->opcode = O_IP_DST_ME;
2757         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2758                 cmd->opcode = O_IP_DST;
2759         else                                                    /* addr/mask */
2760                 cmd->opcode = O_IP_DST_MASK;
2761         return cmd;
2762 }
2763
2764 static ipfw_insn *
2765 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
2766 {
2767         /* XXX "any" is trapped before. Perhaps "to" */
2768         if (_substrcmp(av, "any") == 0) {
2769                 return NULL;
2770         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
2771                 /* XXX todo: check that we have a protocol with ports */
2772                 cmd->opcode = opcode;
2773                 return cmd;
2774         }
2775         return NULL;
2776 }
2777
2778 static ipfw_insn *
2779 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2780 {
2781         struct in6_addr a;
2782         char *host, *ch, buf[INET6_ADDRSTRLEN];
2783         ipfw_insn *ret = NULL;
2784         int len;
2785
2786         /* Copy first address in set if needed */
2787         if ((ch = strpbrk(av, "/,")) != NULL) {
2788                 len = ch - av;
2789                 strlcpy(buf, av, sizeof(buf));
2790                 if (len < sizeof(buf))
2791                         buf[len] = '\0';
2792                 host = buf;
2793         } else
2794                 host = av;
2795
2796         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2797             inet_pton(AF_INET6, host, &a) == 1)
2798                 ret = add_srcip6(cmd, av, cblen);
2799         /* XXX: should check for IPv4, not !IPv6 */
2800         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2801             inet_pton(AF_INET6, host, &a) != 1))
2802                 ret = add_srcip(cmd, av, cblen);
2803         if (ret == NULL && strcmp(av, "any") != 0)
2804                 ret = cmd;
2805
2806         return ret;
2807 }
2808
2809 static ipfw_insn *
2810 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2811 {
2812         struct in6_addr a;
2813         char *host, *ch, buf[INET6_ADDRSTRLEN];
2814         ipfw_insn *ret = NULL;
2815         int len;
2816
2817         /* Copy first address in set if needed */
2818         if ((ch = strpbrk(av, "/,")) != NULL) {
2819                 len = ch - av;
2820                 strlcpy(buf, av, sizeof(buf));
2821                 if (len < sizeof(buf))
2822                         buf[len] = '\0';
2823                 host = buf;
2824         } else
2825                 host = av;
2826
2827         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2828             inet_pton(AF_INET6, host, &a) == 1)
2829                 ret = add_dstip6(cmd, av, cblen);
2830         /* XXX: should check for IPv4, not !IPv6 */
2831         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2832             inet_pton(AF_INET6, host, &a) != 1))
2833                 ret = add_dstip(cmd, av, cblen);
2834         if (ret == NULL && strcmp(av, "any") != 0)
2835                 ret = cmd;
2836
2837         return ret;
2838 }
2839
2840 /*
2841  * Parse arguments and assemble the microinstructions which make up a rule.
2842  * Rules are added into the 'rulebuf' and then copied in the correct order
2843  * into the actual rule.
2844  *
2845  * The syntax for a rule starts with the action, followed by
2846  * optional action parameters, and the various match patterns.
2847  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2848  * (generated if the rule includes a keep-state option), then the
2849  * various match patterns, log/altq actions, and the actual action.
2850  *
2851  */
2852 void
2853 ipfw_add(char *av[])
2854 {
2855         /*
2856          * rules are added into the 'rulebuf' and then copied in
2857          * the correct order into the actual rule.
2858          * Some things that need to go out of order (prob, action etc.)
2859          * go into actbuf[].
2860          */
2861         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2862         int rblen, ablen, cblen;
2863
2864         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2865         ipfw_insn *first_cmd;   /* first match pattern */
2866
2867         struct ip_fw *rule;
2868
2869         /*
2870          * various flags used to record that we entered some fields.
2871          */
2872         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2873         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2874         size_t len;
2875
2876         int i;
2877
2878         int open_par = 0;       /* open parenthesis ( */
2879
2880         /* proto is here because it is used to fetch ports */
2881         u_char proto = IPPROTO_IP;      /* default protocol */
2882
2883         double match_prob = 1; /* match probability, default is always match */
2884
2885         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2886         bzero(cmdbuf, sizeof(cmdbuf));
2887         bzero(rulebuf, sizeof(rulebuf));
2888
2889         rule = (struct ip_fw *)rulebuf;
2890         cmd = (ipfw_insn *)cmdbuf;
2891         action = (ipfw_insn *)actbuf;
2892
2893         rblen = sizeof(rulebuf) / sizeof(rulebuf[0]);
2894         rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]);
2895         ablen = sizeof(actbuf) / sizeof(actbuf[0]);
2896         cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]);
2897         cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1;
2898
2899 #define CHECK_RBUFLEN(len)      { CHECK_LENGTH(rblen, len); rblen -= len; }
2900 #define CHECK_ACTLEN            CHECK_LENGTH(ablen, action->len)
2901
2902         av++;
2903
2904         /* [rule N]     -- Rule number optional */
2905         if (av[0] && isdigit(**av)) {
2906                 rule->rulenum = atoi(*av);
2907                 av++;
2908         }
2909
2910         /* [set N]      -- set number (0..RESVD_SET), optional */
2911         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2912                 int set = strtoul(av[1], NULL, 10);
2913                 if (set < 0 || set > RESVD_SET)
2914                         errx(EX_DATAERR, "illegal set %s", av[1]);
2915                 rule->set = set;
2916                 av += 2;
2917         }
2918
2919         /* [prob D]     -- match probability, optional */
2920         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2921                 match_prob = strtod(av[1], NULL);
2922
2923                 if (match_prob <= 0 || match_prob > 1)
2924                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2925                 av += 2;
2926         }
2927
2928         /* action       -- mandatory */
2929         NEED1("missing action");
2930         i = match_token(rule_actions, *av);
2931         av++;
2932         action->len = 1;        /* default */
2933         CHECK_ACTLEN;
2934         switch(i) {
2935         case TOK_CHECKSTATE:
2936                 have_state = action;
2937                 action->opcode = O_CHECK_STATE;
2938                 break;
2939
2940         case TOK_ACCEPT:
2941                 action->opcode = O_ACCEPT;
2942                 break;
2943
2944         case TOK_DENY:
2945                 action->opcode = O_DENY;
2946                 action->arg1 = 0;
2947                 break;
2948
2949         case TOK_REJECT:
2950                 action->opcode = O_REJECT;
2951                 action->arg1 = ICMP_UNREACH_HOST;
2952                 break;
2953
2954         case TOK_RESET:
2955                 action->opcode = O_REJECT;
2956                 action->arg1 = ICMP_REJECT_RST;
2957                 break;
2958
2959         case TOK_RESET6:
2960                 action->opcode = O_UNREACH6;
2961                 action->arg1 = ICMP6_UNREACH_RST;
2962                 break;
2963
2964         case TOK_UNREACH:
2965                 action->opcode = O_REJECT;
2966                 NEED1("missing reject code");
2967                 fill_reject_code(&action->arg1, *av);
2968                 av++;
2969                 break;
2970
2971         case TOK_UNREACH6:
2972                 action->opcode = O_UNREACH6;
2973                 NEED1("missing unreach code");
2974                 fill_unreach6_code(&action->arg1, *av);
2975                 av++;
2976                 break;
2977
2978         case TOK_COUNT:
2979                 action->opcode = O_COUNT;
2980                 break;
2981
2982         case TOK_NAT:
2983                 action->opcode = O_NAT;
2984                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2985                 CHECK_ACTLEN;
2986                 if (_substrcmp(*av, "global") == 0) {
2987                         action->arg1 = 0;
2988                         av++;
2989                         break;
2990                 } else
2991                         goto chkarg;
2992
2993         case TOK_QUEUE:
2994                 action->opcode = O_QUEUE;
2995                 goto chkarg;
2996         case TOK_PIPE:
2997                 action->opcode = O_PIPE;
2998                 goto chkarg;
2999         case TOK_SKIPTO:
3000                 action->opcode = O_SKIPTO;
3001                 goto chkarg;
3002         case TOK_NETGRAPH:
3003                 action->opcode = O_NETGRAPH;
3004                 goto chkarg;
3005         case TOK_NGTEE:
3006                 action->opcode = O_NGTEE;
3007                 goto chkarg;
3008         case TOK_DIVERT:
3009                 action->opcode = O_DIVERT;
3010                 goto chkarg;
3011         case TOK_TEE:
3012                 action->opcode = O_TEE;
3013                 goto chkarg;
3014         case TOK_CALL:
3015                 action->opcode = O_CALLRETURN;
3016 chkarg:
3017                 if (!av[0])
3018                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
3019                 if (isdigit(**av)) {
3020                         action->arg1 = strtoul(*av, NULL, 10);
3021                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
3022                                 errx(EX_DATAERR, "illegal argument for %s",
3023                                     *(av - 1));
3024                 } else if (_substrcmp(*av, "tablearg") == 0) {
3025                         action->arg1 = IP_FW_TABLEARG;
3026                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
3027                         struct servent *s;
3028                         setservent(1);
3029                         s = getservbyname(av[0], "divert");
3030                         if (s != NULL)
3031                                 action->arg1 = ntohs(s->s_port);
3032                         else
3033                                 errx(EX_DATAERR, "illegal divert/tee port");
3034                 } else
3035                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
3036                 av++;
3037                 break;
3038
3039         case TOK_FORWARD: {
3040                 /*
3041                  * Locate the address-port separator (':' or ',').
3042                  * Could be one of the following:
3043                  *      hostname:port
3044                  *      IPv4 a.b.c.d,port
3045                  *      IPv4 a.b.c.d:port
3046                  *      IPv6 w:x:y::z,port
3047                  * The ':' can only be used with hostname and IPv4 address.
3048                  * XXX-BZ Should we also support [w:x:y::z]:port?
3049                  */
3050                 struct sockaddr_storage result;
3051                 struct addrinfo *res;
3052                 char *s, *end;
3053                 int family;
3054                 u_short port_number;
3055
3056                 NEED1("missing forward address[:port]");
3057
3058                 /*
3059                  * locate the address-port separator (':' or ',')
3060                  */
3061                 s = strchr(*av, ',');
3062                 if (s == NULL) {
3063                         /* Distinguish between IPv4:port and IPv6 cases. */
3064                         s = strchr(*av, ':');
3065                         if (s && strchr(s+1, ':'))
3066                                 s = NULL; /* no port */
3067                 }
3068
3069                 port_number = 0;
3070                 if (s != NULL) {
3071                         /* Terminate host portion and set s to start of port. */
3072                         *(s++) = '\0';
3073                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
3074                         if (s == end)
3075                                 errx(EX_DATAERR,
3076                                     "illegal forwarding port ``%s''", s);
3077                         port_number = (u_short)i;
3078                 }
3079
3080                 if (_substrcmp(*av, "tablearg") == 0) {
3081                         family = PF_INET;
3082                         ((struct sockaddr_in*)&result)->sin_addr.s_addr =
3083                             INADDR_ANY;
3084                 } else {
3085                         /*
3086                          * Resolve the host name or address to a family and a
3087                          * network representation of the address.
3088                          */
3089                         if (getaddrinfo(*av, NULL, NULL, &res))
3090                                 errx(EX_DATAERR, NULL);
3091                         /* Just use the first host in the answer. */
3092                         family = res->ai_family;
3093                         memcpy(&result, res->ai_addr, res->ai_addrlen);
3094                         freeaddrinfo(res);
3095                 }
3096
3097                 if (family == PF_INET) {
3098                         ipfw_insn_sa *p = (ipfw_insn_sa *)action;
3099
3100                         action->opcode = O_FORWARD_IP;
3101                         action->len = F_INSN_SIZE(ipfw_insn_sa);
3102                         CHECK_ACTLEN;
3103
3104                         /*
3105                          * In the kernel we assume AF_INET and use only
3106                          * sin_port and sin_addr. Remember to set sin_len as
3107                          * the routing code seems to use it too.
3108                          */
3109                         p->sa.sin_len = sizeof(struct sockaddr_in);
3110                         p->sa.sin_family = AF_INET;
3111                         p->sa.sin_port = port_number;
3112                         p->sa.sin_addr.s_addr =
3113                              ((struct sockaddr_in *)&result)->sin_addr.s_addr;
3114                 } else if (family == PF_INET6) {
3115                         ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
3116
3117                         action->opcode = O_FORWARD_IP6;
3118                         action->len = F_INSN_SIZE(ipfw_insn_sa6);
3119                         CHECK_ACTLEN;
3120
3121                         p->sa.sin6_len = sizeof(struct sockaddr_in6);
3122                         p->sa.sin6_family = AF_INET6;
3123                         p->sa.sin6_port = port_number;
3124                         p->sa.sin6_flowinfo = 0;
3125                         p->sa.sin6_scope_id = 0;
3126                         /* No table support for v6 yet. */
3127                         bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
3128                             &p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
3129                 } else {
3130                         errx(EX_DATAERR, "Invalid address family in forward action");
3131                 }
3132                 av++;
3133                 break;
3134             }
3135         case TOK_COMMENT:
3136                 /* pretend it is a 'count' rule followed by the comment */
3137                 action->opcode = O_COUNT;
3138                 av--;           /* go back... */
3139                 break;
3140
3141         case TOK_SETFIB:
3142             {
3143                 int numfibs;
3144                 size_t intsize = sizeof(int);
3145
3146                 action->opcode = O_SETFIB;
3147                 NEED1("missing fib number");
3148                 if (_substrcmp(*av, "tablearg") == 0) {
3149                         action->arg1 = IP_FW_TABLEARG;
3150                 } else {
3151                         action->arg1 = strtoul(*av, NULL, 10);
3152                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
3153                             NULL, 0) == -1)
3154                                 errx(EX_DATAERR, "fibs not suported.\n");
3155                         if (action->arg1 >= numfibs)  /* Temporary */
3156                                 errx(EX_DATAERR, "fib too large.\n");
3157                 }
3158                 av++;
3159                 break;
3160             }
3161
3162         case TOK_SETDSCP:
3163             {
3164                 int code;
3165
3166                 action->opcode = O_SETDSCP;
3167                 NEED1("missing DSCP code");
3168                 if (_substrcmp(*av, "tablearg") == 0) {
3169                         action->arg1 = IP_FW_TABLEARG;
3170                 } else if (isalpha(*av[0])) {
3171                         if ((code = match_token(f_ipdscp, *av)) == -1)
3172                                 errx(EX_DATAERR, "Unknown DSCP code");
3173                         action->arg1 = code;
3174                 } else
3175                         action->arg1 = strtoul(*av, NULL, 10);
3176                 av++;
3177                 break;
3178             }
3179
3180         case TOK_REASS:
3181                 action->opcode = O_REASS;
3182                 break;
3183
3184         case TOK_RETURN:
3185                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
3186                 break;
3187
3188         default:
3189                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
3190         }
3191         action = next_cmd(action, &ablen);
3192
3193         /*
3194          * [altq queuename] -- altq tag, optional
3195          * [log [logamount N]]  -- log, optional
3196          *
3197          * If they exist, it go first in the cmdbuf, but then it is
3198          * skipped in the copy section to the end of the buffer.
3199          */
3200         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
3201                 av++;
3202                 switch (i) {
3203                 case TOK_LOG:
3204                     {
3205                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
3206                         int l;
3207
3208                         if (have_log)
3209                                 errx(EX_DATAERR,
3210                                     "log cannot be specified more than once");
3211                         have_log = (ipfw_insn *)c;
3212                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
3213                         CHECK_CMDLEN;
3214                         cmd->opcode = O_LOG;
3215                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
3216                                 av++;
3217                                 NEED1("logamount requires argument");
3218                                 l = atoi(*av);
3219                                 if (l < 0)
3220                                         errx(EX_DATAERR,
3221                                             "logamount must be positive");
3222                                 c->max_log = l;
3223                                 av++;
3224                         } else {
3225                                 len = sizeof(c->max_log);
3226                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
3227                                     &c->max_log, &len, NULL, 0) == -1) {
3228                                         if (co.test_only) {
3229                                                 c->max_log = 0;
3230                                                 break;
3231                                         }
3232                                         errx(1, "sysctlbyname(\"%s\")",
3233                                             "net.inet.ip.fw.verbose_limit");
3234                                 }
3235                         }
3236                     }
3237                         break;
3238
3239 #ifndef NO_ALTQ
3240                 case TOK_ALTQ:
3241                     {
3242                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
3243
3244                         NEED1("missing altq queue name");
3245                         if (have_altq)
3246                                 errx(EX_DATAERR,
3247                                     "altq cannot be specified more than once");
3248                         have_altq = (ipfw_insn *)a;
3249                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
3250                         CHECK_CMDLEN;
3251                         cmd->opcode = O_ALTQ;
3252                         a->qid = altq_name_to_qid(*av);
3253                         av++;
3254                     }
3255                         break;
3256 #endif
3257
3258                 case TOK_TAG:
3259                 case TOK_UNTAG: {
3260                         uint16_t tag;
3261
3262                         if (have_tag)
3263                                 errx(EX_USAGE, "tag and untag cannot be "
3264                                     "specified more than once");
3265                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
3266                            rule_action_params);
3267                         have_tag = cmd;
3268                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
3269                         av++;
3270                         break;
3271                 }
3272
3273                 default:
3274                         abort();
3275                 }
3276                 cmd = next_cmd(cmd, &cblen);
3277         }
3278
3279         if (have_state) /* must be a check-state, we are done */
3280                 goto done;
3281
3282 #define OR_START(target)                                        \
3283         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
3284                 if (open_par)                                   \
3285                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
3286                 prev = NULL;                                    \
3287                 open_par = 1;                                   \
3288                 if ( (av[0])[1] == '\0') {                      \
3289                         av++;                                   \
3290                 } else                                          \
3291                         (*av)++;                                \
3292         }                                                       \
3293         target:                                                 \
3294
3295
3296 #define CLOSE_PAR                                               \
3297         if (open_par) {                                         \
3298                 if (av[0] && (                                  \
3299                     strcmp(*av, ")") == 0 ||                    \
3300                     strcmp(*av, "}") == 0)) {                   \
3301                         prev = NULL;                            \
3302                         open_par = 0;                           \
3303                         av++;                                   \
3304                 } else                                          \
3305                         errx(EX_USAGE, "missing \")\"\n");      \
3306         }
3307
3308 #define NOT_BLOCK                                               \
3309         if (av[0] && _substrcmp(*av, "not") == 0) {             \
3310                 if (cmd->len & F_NOT)                           \
3311                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3312                 cmd->len |= F_NOT;                              \
3313                 av++;                                           \
3314         }
3315
3316 #define OR_BLOCK(target)                                        \
3317         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3318                 if (prev == NULL || open_par == 0)              \
3319                         errx(EX_DATAERR, "invalid OR block");   \
3320                 prev->len |= F_OR;                              \
3321                 av++;                                   \
3322                 goto target;                                    \
3323         }                                                       \
3324         CLOSE_PAR;
3325
3326         first_cmd = cmd;
3327
3328 #if 0
3329         /*
3330          * MAC addresses, optional.
3331          * If we have this, we skip the part "proto from src to dst"
3332          * and jump straight to the option parsing.
3333          */
3334         NOT_BLOCK;
3335         NEED1("missing protocol");
3336         if (_substrcmp(*av, "MAC") == 0 ||
3337             _substrcmp(*av, "mac") == 0) {
3338                 av++;                   /* the "MAC" keyword */
3339                 add_mac(cmd, av);       /* exits in case of errors */
3340                 cmd = next_cmd(cmd);
3341                 av += 2;                /* dst-mac and src-mac */
3342                 NOT_BLOCK;
3343                 NEED1("missing mac type");
3344                 if (add_mactype(cmd, av[0]))
3345                         cmd = next_cmd(cmd);
3346                 av++;                   /* any or mac-type */
3347                 goto read_options;
3348         }
3349 #endif
3350
3351         /*
3352          * protocol, mandatory
3353          */
3354     OR_START(get_proto);
3355         NOT_BLOCK;
3356         NEED1("missing protocol");
3357         if (add_proto_compat(cmd, *av, &proto)) {
3358                 av++;
3359                 if (F_LEN(cmd) != 0) {
3360                         prev = cmd;
3361                         cmd = next_cmd(cmd, &cblen);
3362                 }
3363         } else if (first_cmd != cmd) {
3364                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3365         } else
3366                 goto read_options;
3367     OR_BLOCK(get_proto);
3368
3369         /*
3370          * "from", mandatory
3371          */
3372         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3373                 errx(EX_USAGE, "missing ``from''");
3374         av++;
3375
3376         /*
3377          * source IP, mandatory
3378          */
3379     OR_START(source_ip);
3380         NOT_BLOCK;      /* optional "not" */
3381         NEED1("missing source address");
3382         if (add_src(cmd, *av, proto, cblen)) {
3383                 av++;
3384                 if (F_LEN(cmd) != 0) {  /* ! any */
3385                         prev = cmd;
3386                         cmd = next_cmd(cmd, &cblen);
3387                 }
3388         } else
3389                 errx(EX_USAGE, "bad source address %s", *av);
3390     OR_BLOCK(source_ip);
3391
3392         /*
3393          * source ports, optional
3394          */
3395         NOT_BLOCK;      /* optional "not" */
3396         if ( av[0] != NULL ) {
3397                 if (_substrcmp(*av, "any") == 0 ||
3398                     add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3399                         av++;
3400                         if (F_LEN(cmd) != 0)
3401                                 cmd = next_cmd(cmd, &cblen);
3402                 }
3403         }
3404
3405         /*
3406          * "to", mandatory
3407          */
3408         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3409                 errx(EX_USAGE, "missing ``to''");
3410         av++;
3411
3412         /*
3413          * destination, mandatory
3414          */
3415     OR_START(dest_ip);
3416         NOT_BLOCK;      /* optional "not" */
3417         NEED1("missing dst address");
3418         if (add_dst(cmd, *av, proto, cblen)) {
3419                 av++;
3420                 if (F_LEN(cmd) != 0) {  /* ! any */
3421                         prev = cmd;
3422                         cmd = next_cmd(cmd, &cblen);
3423                 }
3424         } else
3425                 errx( EX_USAGE, "bad destination address %s", *av);
3426     OR_BLOCK(dest_ip);
3427
3428         /*
3429          * dest. ports, optional
3430          */
3431         NOT_BLOCK;      /* optional "not" */
3432         if (av[0]) {
3433                 if (_substrcmp(*av, "any") == 0 ||
3434                     add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3435                         av++;
3436                         if (F_LEN(cmd) != 0)
3437                                 cmd = next_cmd(cmd, &cblen);
3438                 }
3439         }
3440
3441 read_options:
3442         if (av[0] && first_cmd == cmd) {
3443                 /*
3444                  * nothing specified so far, store in the rule to ease
3445                  * printout later.
3446                  */
3447                  rule->_pad = 1;
3448         }
3449         prev = NULL;
3450         while ( av[0] != NULL ) {
3451                 char *s;
3452                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3453
3454                 s = *av;
3455                 cmd32 = (ipfw_insn_u32 *)cmd;
3456
3457                 if (*s == '!') {        /* alternate syntax for NOT */
3458                         if (cmd->len & F_NOT)
3459                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3460                         cmd->len = F_NOT;
3461                         s++;
3462                 }
3463                 i = match_token(rule_options, s);
3464                 av++;
3465                 switch(i) {
3466                 case TOK_NOT:
3467                         if (cmd->len & F_NOT)
3468                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3469                         cmd->len = F_NOT;
3470                         break;
3471
3472                 case TOK_OR:
3473                         if (open_par == 0 || prev == NULL)
3474                                 errx(EX_USAGE, "invalid \"or\" block\n");
3475                         prev->len |= F_OR;
3476                         break;
3477
3478                 case TOK_STARTBRACE:
3479                         if (open_par)
3480                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3481                         open_par = 1;
3482                         break;
3483
3484                 case TOK_ENDBRACE:
3485                         if (!open_par)
3486                                 errx(EX_USAGE, "+missing \")\"\n");
3487                         open_par = 0;
3488                         prev = NULL;
3489                         break;
3490
3491                 case TOK_IN:
3492                         fill_cmd(cmd, O_IN, 0, 0);
3493                         break;
3494
3495                 case TOK_OUT:
3496                         cmd->len ^= F_NOT; /* toggle F_NOT */
3497                         fill_cmd(cmd, O_IN, 0, 0);
3498                         break;
3499
3500                 case TOK_DIVERTED:
3501                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3502                         break;
3503
3504                 case TOK_DIVERTEDLOOPBACK:
3505                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3506                         break;
3507
3508                 case TOK_DIVERTEDOUTPUT:
3509                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3510                         break;
3511
3512                 case TOK_FRAG:
3513                         fill_cmd(cmd, O_FRAG, 0, 0);
3514                         break;
3515
3516                 case TOK_LAYER2:
3517                         fill_cmd(cmd, O_LAYER2, 0, 0);
3518                         break;
3519
3520                 case TOK_XMIT:
3521                 case TOK_RECV:
3522                 case TOK_VIA:
3523                         NEED1("recv, xmit, via require interface name"
3524                                 " or address");
3525                         fill_iface((ipfw_insn_if *)cmd, av[0], cblen);
3526                         av++;
3527                         if (F_LEN(cmd) == 0)    /* not a valid address */
3528                                 break;
3529                         if (i == TOK_XMIT)
3530                                 cmd->opcode = O_XMIT;
3531                         else if (i == TOK_RECV)
3532                                 cmd->opcode = O_RECV;
3533                         else if (i == TOK_VIA)
3534                                 cmd->opcode = O_VIA;
3535                         break;
3536
3537                 case TOK_ICMPTYPES:
3538                         NEED1("icmptypes requires list of types");
3539                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3540                         av++;
3541                         break;
3542
3543                 case TOK_ICMP6TYPES:
3544                         NEED1("icmptypes requires list of types");
3545                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen);
3546                         av++;
3547                         break;
3548
3549                 case TOK_IPTTL:
3550                         NEED1("ipttl requires TTL");
3551                         if (strpbrk(*av, "-,")) {
3552                             if (!add_ports(cmd, *av, 0, O_IPTTL, cblen))
3553                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3554                         } else
3555                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3556                         av++;
3557                         break;
3558
3559                 case TOK_IPID:
3560                         NEED1("ipid requires id");
3561                         if (strpbrk(*av, "-,")) {
3562                             if (!add_ports(cmd, *av, 0, O_IPID, cblen))
3563                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3564                         } else
3565                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3566                         av++;
3567                         break;
3568
3569                 case TOK_IPLEN:
3570                         NEED1("iplen requires length");
3571                         if (strpbrk(*av, "-,")) {
3572                             if (!add_ports(cmd, *av, 0, O_IPLEN, cblen))
3573                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3574                         } else
3575                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3576                         av++;
3577                         break;
3578
3579                 case TOK_IPVER:
3580                         NEED1("ipver requires version");
3581                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3582                         av++;
3583                         break;
3584
3585                 case TOK_IPPRECEDENCE:
3586                         NEED1("ipprecedence requires value");
3587                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3588                             (strtoul(*av, NULL, 0) & 7) << 5);
3589                         av++;
3590                         break;
3591
3592                 case TOK_DSCP:
3593                         NEED1("missing DSCP code");
3594                         fill_dscp(cmd, *av, cblen);
3595                         av++;
3596                         break;
3597
3598                 case TOK_IPOPTS:
3599                         NEED1("missing argument for ipoptions");
3600                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3601                         av++;
3602                         break;
3603
3604                 case TOK_IPTOS:
3605                         NEED1("missing argument for iptos");
3606                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3607                         av++;
3608                         break;
3609
3610                 case TOK_UID:
3611                         NEED1("uid requires argument");
3612                     {
3613                         char *end;
3614                         uid_t uid;
3615                         struct passwd *pwd;
3616
3617                         cmd->opcode = O_UID;
3618                         uid = strtoul(*av, &end, 0);
3619                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3620                         if (pwd == NULL)
3621                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3622                         cmd32->d[0] = pwd->pw_uid;
3623                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3624                         av++;
3625                     }
3626                         break;
3627
3628                 case TOK_GID:
3629                         NEED1("gid requires argument");
3630                     {
3631                         char *end;
3632                         gid_t gid;
3633                         struct group *grp;
3634
3635                         cmd->opcode = O_GID;
3636                         gid = strtoul(*av, &end, 0);
3637                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3638                         if (grp == NULL)
3639                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3640                         cmd32->d[0] = grp->gr_gid;
3641                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3642                         av++;
3643                     }
3644                         break;
3645
3646                 case TOK_JAIL:
3647                         NEED1("jail requires argument");
3648                     {
3649                         char *end;
3650                         int jid;
3651
3652                         cmd->opcode = O_JAIL;
3653                         jid = (int)strtol(*av, &end, 0);
3654                         if (jid < 0 || *end != '\0')
3655                                 errx(EX_DATAERR, "jail requires prison ID");
3656                         cmd32->d[0] = (uint32_t)jid;
3657                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3658                         av++;
3659                     }
3660                         break;
3661
3662                 case TOK_ESTAB:
3663                         fill_cmd(cmd, O_ESTAB, 0, 0);
3664                         break;
3665
3666                 case TOK_SETUP:
3667                         fill_cmd(cmd, O_TCPFLAGS, 0,
3668                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3669                         break;
3670
3671                 case TOK_TCPDATALEN:
3672                         NEED1("tcpdatalen requires length");
3673                         if (strpbrk(*av, "-,")) {
3674                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen))
3675                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3676                         } else
3677                             fill_cmd(cmd, O_TCPDATALEN, 0,
3678                                     strtoul(*av, NULL, 0));
3679                         av++;
3680                         break;
3681
3682                 case TOK_TCPOPTS:
3683                         NEED1("missing argument for tcpoptions");
3684                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3685                         av++;
3686                         break;
3687
3688                 case TOK_TCPSEQ:
3689                 case TOK_TCPACK:
3690                         NEED1("tcpseq/tcpack requires argument");
3691                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3692                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3693                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3694                         av++;
3695                         break;
3696
3697                 case TOK_TCPWIN:
3698                         NEED1("tcpwin requires length");
3699                         if (strpbrk(*av, "-,")) {
3700                             if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen))
3701                                 errx(EX_DATAERR, "invalid tcpwin len %s", *av);
3702                         } else
3703                             fill_cmd(cmd, O_TCPWIN, 0,
3704                                     strtoul(*av, NULL, 0));
3705                         av++;
3706                         break;
3707
3708                 case TOK_TCPFLAGS:
3709                         NEED1("missing argument for tcpflags");
3710                         cmd->opcode = O_TCPFLAGS;
3711                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3712                         av++;
3713                         break;
3714
3715                 case TOK_KEEPSTATE:
3716                         if (open_par)
3717                                 errx(EX_USAGE, "keep-state cannot be part "
3718                                     "of an or block");
3719                         if (have_state)
3720                                 errx(EX_USAGE, "only one of keep-state "
3721                                         "and limit is allowed");
3722                         have_state = cmd;
3723                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3724                         break;
3725
3726                 case TOK_LIMIT: {
3727                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3728                         int val;
3729
3730                         if (open_par)
3731                                 errx(EX_USAGE,
3732                                     "limit cannot be part of an or block");
3733                         if (have_state)
3734                                 errx(EX_USAGE, "only one of keep-state and "
3735                                     "limit is allowed");
3736                         have_state = cmd;
3737
3738                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3739                         CHECK_CMDLEN;
3740                         cmd->opcode = O_LIMIT;
3741                         c->limit_mask = c->conn_limit = 0;
3742
3743                         while ( av[0] != NULL ) {
3744                                 if ((val = match_token(limit_masks, *av)) <= 0)
3745                                         break;
3746                                 c->limit_mask |= val;
3747                                 av++;
3748                         }
3749
3750                         if (c->limit_mask == 0)
3751                                 errx(EX_USAGE, "limit: missing limit mask");
3752
3753                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3754                             TOK_LIMIT, rule_options);
3755
3756                         av++;
3757                         break;
3758                 }
3759
3760                 case TOK_PROTO:
3761                         NEED1("missing protocol");
3762                         if (add_proto(cmd, *av, &proto)) {
3763                                 av++;
3764                         } else
3765                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3766                                     *av);
3767                         break;
3768
3769                 case TOK_SRCIP:
3770                         NEED1("missing source IP");
3771                         if (add_srcip(cmd, *av, cblen)) {
3772                                 av++;
3773                         }
3774                         break;
3775
3776                 case TOK_DSTIP:
3777                         NEED1("missing destination IP");
3778                         if (add_dstip(cmd, *av, cblen)) {
3779                                 av++;
3780                         }
3781                         break;
3782
3783                 case TOK_SRCIP6:
3784                         NEED1("missing source IP6");
3785                         if (add_srcip6(cmd, *av, cblen)) {
3786                                 av++;
3787                         }
3788                         break;
3789
3790                 case TOK_DSTIP6:
3791                         NEED1("missing destination IP6");
3792                         if (add_dstip6(cmd, *av, cblen)) {
3793                                 av++;
3794                         }
3795                         break;
3796
3797                 case TOK_SRCPORT:
3798                         NEED1("missing source port");
3799                         if (_substrcmp(*av, "any") == 0 ||
3800                             add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3801                                 av++;
3802                         } else
3803                                 errx(EX_DATAERR, "invalid source port %s", *av);
3804                         break;
3805
3806                 case TOK_DSTPORT:
3807                         NEED1("missing destination port");
3808                         if (_substrcmp(*av, "any") == 0 ||
3809                             add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3810                                 av++;
3811                         } else
3812                                 errx(EX_DATAERR, "invalid destination port %s",
3813                                     *av);
3814                         break;
3815
3816                 case TOK_MAC:
3817                         if (add_mac(cmd, av, cblen))
3818                                 av += 2;
3819                         break;
3820
3821                 case TOK_MACTYPE:
3822                         NEED1("missing mac type");
3823                         if (!add_mactype(cmd, *av, cblen))
3824                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3825                         av++;
3826                         break;
3827
3828                 case TOK_VERREVPATH:
3829                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3830                         break;
3831
3832                 case TOK_VERSRCREACH:
3833                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3834                         break;
3835
3836                 case TOK_ANTISPOOF:
3837                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3838                         break;
3839
3840                 case TOK_IPSEC:
3841                         fill_cmd(cmd, O_IPSEC, 0, 0);
3842                         break;
3843
3844                 case TOK_IPV6:
3845                         fill_cmd(cmd, O_IP6, 0, 0);
3846                         break;
3847
3848                 case TOK_IPV4:
3849                         fill_cmd(cmd, O_IP4, 0, 0);
3850                         break;
3851
3852                 case TOK_EXT6HDR:
3853                         fill_ext6hdr( cmd, *av );
3854                         av++;
3855                         break;
3856
3857                 case TOK_FLOWID:
3858                         if (proto != IPPROTO_IPV6 )
3859                                 errx( EX_USAGE, "flow-id filter is active "
3860                                     "only for ipv6 protocol\n");
3861                         fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen);
3862                         av++;
3863                         break;
3864
3865                 case TOK_COMMENT:
3866                         fill_comment(cmd, av, cblen);
3867                         av[0]=NULL;
3868                         break;
3869
3870                 case TOK_TAGGED:
3871                         if (av[0] && strpbrk(*av, "-,")) {
3872                                 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen))
3873                                         errx(EX_DATAERR, "tagged: invalid tag"
3874                                             " list: %s", *av);
3875                         }
3876                         else {
3877                                 uint16_t tag;
3878
3879                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3880                                     TOK_TAGGED, rule_options);
3881                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3882                         }
3883                         av++;
3884                         break;
3885
3886                 case TOK_FIB:
3887                         NEED1("fib requires fib number");
3888                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3889                         av++;
3890                         break;
3891                 case TOK_SOCKARG:
3892                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3893                         break;
3894
3895                 case TOK_LOOKUP: {
3896                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3897                         char *p;
3898                         int j;
3899
3900                         if (!av[0] || !av[1])
3901                                 errx(EX_USAGE, "format: lookup argument tablenum");
3902                         cmd->opcode = O_IP_DST_LOOKUP;
3903                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3904                         i = match_token(rule_options, *av);
3905                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3906                                 if (i == lookup_key[j])
3907                                         break;
3908                         }
3909                         if (lookup_key[j] <= 0)
3910                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3911                         __PAST_END(c->d, 1) = j; // i converted to option
3912                         av++;
3913                         cmd->arg1 = strtoul(*av, &p, 0);
3914                         if (p && *p)
3915                                 errx(EX_USAGE, "format: lookup argument tablenum");
3916                         av++;
3917                     }
3918                         break;
3919
3920                 default:
3921                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3922                 }
3923                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3924                         prev = cmd;
3925                         cmd = next_cmd(cmd, &cblen);
3926                 }
3927         }
3928
3929 done:
3930         /*
3931          * Now copy stuff into the rule.
3932          * If we have a keep-state option, the first instruction
3933          * must be a PROBE_STATE (which is generated here).
3934          * If we have a LOG option, it was stored as the first command,
3935          * and now must be moved to the top of the action part.
3936          */
3937         dst = (ipfw_insn *)rule->cmd;
3938
3939         /*
3940          * First thing to write into the command stream is the match probability.
3941          */
3942         if (match_prob != 1) { /* 1 means always match */
3943                 dst->opcode = O_PROB;
3944                 dst->len = 2;
3945                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3946                 dst += dst->len;
3947         }
3948
3949         /*
3950          * generate O_PROBE_STATE if necessary
3951          */
3952         if (have_state && have_state->opcode != O_CHECK_STATE) {
3953                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3954                 dst = next_cmd(dst, &rblen);
3955         }
3956
3957         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3958         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3959                 i = F_LEN(src);
3960                 CHECK_RBUFLEN(i);
3961
3962                 switch (src->opcode) {
3963                 case O_LOG:
3964                 case O_KEEP_STATE:
3965                 case O_LIMIT:
3966                 case O_ALTQ:
3967                 case O_TAG:
3968                         break;
3969                 default:
3970                         bcopy(src, dst, i * sizeof(uint32_t));
3971                         dst += i;
3972                 }
3973         }
3974
3975         /*
3976          * put back the have_state command as last opcode
3977          */
3978         if (have_state && have_state->opcode != O_CHECK_STATE) {
3979                 i = F_LEN(have_state);
3980                 CHECK_RBUFLEN(i);
3981                 bcopy(have_state, dst, i * sizeof(uint32_t));
3982                 dst += i;
3983         }
3984         /*
3985          * start action section
3986          */
3987         rule->act_ofs = dst - rule->cmd;
3988
3989         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3990         if (have_log) {
3991                 i = F_LEN(have_log);
3992                 CHECK_RBUFLEN(i);
3993                 bcopy(have_log, dst, i * sizeof(uint32_t));
3994                 dst += i;
3995         }
3996         if (have_altq) {
3997                 i = F_LEN(have_altq);
3998                 CHECK_RBUFLEN(i);
3999                 bcopy(have_altq, dst, i * sizeof(uint32_t));
4000                 dst += i;
4001         }
4002         if (have_tag) {
4003                 i = F_LEN(have_tag);
4004                 CHECK_RBUFLEN(i);
4005                 bcopy(have_tag, dst, i * sizeof(uint32_t));
4006                 dst += i;
4007         }
4008
4009         /*
4010          * copy all other actions
4011          */
4012         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
4013                 i = F_LEN(src);
4014                 CHECK_RBUFLEN(i);
4015                 bcopy(src, dst, i * sizeof(uint32_t));
4016                 dst += i;
4017         }
4018
4019         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
4020         i = (char *)dst - (char *)rule;
4021         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
4022                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
4023         if (!co.do_quiet)
4024                 show_ipfw(rule, 0, 0);
4025 }
4026
4027 /*
4028  * clear the counters or the log counters.
4029  */
4030 void
4031 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
4032 {
4033         uint32_t arg, saved_arg;
4034         int failed = EX_OK;
4035         char const *errstr;
4036         char const *name = optname ? "RESETLOG" : "ZERO";
4037
4038         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
4039
4040         av++; ac--;
4041
4042         if (!ac) {
4043                 /* clear all entries */
4044                 if (do_cmd(optname, NULL, 0) < 0)
4045                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
4046                 if (!co.do_quiet)
4047                         printf("%s.\n", optname == IP_FW_ZERO ?
4048                             "Accounting cleared":"Logging counts reset");
4049
4050                 return;
4051         }
4052
4053         while (ac) {
4054                 /* Rule number */
4055                 if (isdigit(**av)) {
4056                         arg = strtonum(*av, 0, 0xffff, &errstr);
4057                         if (errstr)
4058                                 errx(EX_DATAERR,
4059                                     "invalid rule number %s\n", *av);
4060                         saved_arg = arg;
4061                         if (co.use_set)
4062                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
4063                         av++;
4064                         ac--;
4065                         if (do_cmd(optname, &arg, sizeof(arg))) {
4066                                 warn("rule %u: setsockopt(IP_FW_%s)",
4067                                     saved_arg, name);
4068                                 failed = EX_UNAVAILABLE;
4069                         } else if (!co.do_quiet)
4070                                 printf("Entry %d %s.\n", saved_arg,
4071                                     optname == IP_FW_ZERO ?
4072                                         "cleared" : "logging count reset");
4073                 } else {
4074                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
4075                 }
4076         }
4077         if (failed != EX_OK)
4078                 exit(failed);
4079 }
4080
4081 void
4082 ipfw_flush(int force)
4083 {
4084         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
4085
4086         if (!force && !co.do_quiet) { /* need to ask user */
4087                 int c;
4088
4089                 printf("Are you sure? [yn] ");
4090                 fflush(stdout);
4091                 do {
4092                         c = toupper(getc(stdin));
4093                         while (c != '\n' && getc(stdin) != '\n')
4094                                 if (feof(stdin))
4095                                         return; /* and do not flush */
4096                 } while (c != 'Y' && c != 'N');
4097                 printf("\n");
4098                 if (c == 'N')   /* user said no */
4099                         return;
4100         }
4101         if (co.do_pipe) {
4102                 dummynet_flush();
4103                 return;
4104         }
4105         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
4106         if (co.use_set) {
4107                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
4108                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
4109                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
4110         } else if (do_cmd(cmd, NULL, 0) < 0)
4111                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
4112                     co.do_pipe ? "DUMMYNET" : "FW");
4113         if (!co.do_quiet)
4114                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
4115 }
4116
4117
4118 static void table_list(uint16_t num, int need_header);
4119 static void table_fill_xentry(char *arg, ipfw_table_xentry *xent);
4120
4121 /*
4122  * This one handles all table-related commands
4123  *      ipfw table N add addr[/masklen] [value]
4124  *      ipfw table N delete addr[/masklen]
4125  *      ipfw table {N | all} flush
4126  *      ipfw table {N | all} list
4127  */
4128 void
4129 ipfw_table_handler(int ac, char *av[])
4130 {
4131         ipfw_table_xentry xent;
4132         int do_add;
4133         int is_all;
4134         size_t len;
4135         uint32_t a;
4136         uint32_t tables_max;
4137
4138         len = sizeof(tables_max);
4139         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
4140             NULL, 0) == -1) {
4141                 if (co.test_only)
4142                         tables_max = 128; /* Old conservative default */
4143                 else
4144                         errx(1, "Can't determine maximum number of ipfw tables."
4145                             " Perhaps you forgot to load ipfw module?");
4146         }
4147
4148         memset(&xent, 0, sizeof(xent));
4149
4150         ac--; av++;
4151         if (ac && isdigit(**av)) {
4152                 xent.tbl = atoi(*av);
4153                 is_all = 0;
4154                 ac--; av++;
4155         } else if (ac && _substrcmp(*av, "all") == 0) {
4156                 xent.tbl = 0;
4157                 is_all = 1;
4158                 ac--; av++;
4159         } else
4160                 errx(EX_USAGE, "table number or 'all' keyword required");
4161         if (xent.tbl >= tables_max)
4162                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
4163                         "value (%d)", tables_max - 1);
4164         NEED1("table needs command");
4165         if (is_all && _substrcmp(*av, "list") != 0
4166                    && _substrcmp(*av, "flush") != 0)
4167                 errx(EX_USAGE, "table number required");
4168
4169         if (_substrcmp(*av, "add") == 0 ||
4170             _substrcmp(*av, "delete") == 0) {
4171                 do_add = **av == 'a';
4172                 ac--; av++;
4173                 if (!ac)
4174                         errx(EX_USAGE, "address required");
4175
4176                 table_fill_xentry(*av, &xent);
4177
4178                 ac--; av++;
4179                 if (do_add && ac) {
4180                         unsigned int tval;
4181                         /* isdigit is a bit of a hack here.. */
4182                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
4183                                 xent.value = strtoul(*av, NULL, 0);
4184                         } else {
4185                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
4186                                         /* The value must be stored in host order        *
4187                                          * so that the values < 65k can be distinguished */
4188                                         xent.value = ntohl(tval);
4189                                 } else {
4190                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
4191                                 }
4192                         }
4193                 } else
4194                         xent.value = 0;
4195                 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL,
4196                     &xent, xent.len) < 0) {
4197                         /* If running silent, don't bomb out on these errors. */
4198                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
4199                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
4200                                     do_add ? "XADD" : "XDEL");
4201                         /* In silent mode, react to a failed add by deleting */
4202                         if (do_add) {
4203                                 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len);
4204                                 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0)
4205                                         err(EX_OSERR,
4206                                             "setsockopt(IP_FW_TABLE_XADD)");
4207                         }
4208                 }
4209         } else if (_substrcmp(*av, "flush") == 0) {
4210                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4211                 do {
4212                         if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl,
4213                             sizeof(xent.tbl)) < 0)
4214                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
4215                 } while (++xent.tbl < a);
4216         } else if (_substrcmp(*av, "list") == 0) {
4217                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4218                 do {
4219                         table_list(xent.tbl, is_all);
4220                 } while (++xent.tbl < a);
4221         } else
4222                 errx(EX_USAGE, "invalid table command %s", *av);
4223 }
4224
4225 static void
4226 table_fill_xentry(char *arg, ipfw_table_xentry *xent)
4227 {
4228         int addrlen, mask, masklen, type;
4229         struct in6_addr *paddr;
4230         uint32_t *pkey;
4231         char *p;
4232         uint32_t key;
4233
4234         mask = 0;
4235         type = 0;
4236         addrlen = 0;
4237         masklen = 0;
4238
4239         /*
4240          * Let's try to guess type by agrument.
4241          * Possible types:
4242          * 1) IPv4[/mask]
4243          * 2) IPv6[/mask]
4244          * 3) interface name
4245          * 4) port, uid/gid or other u32 key (base 10 format)
4246          * 5) hostname
4247          */
4248         paddr = &xent->k.addr6;
4249         if (ishexnumber(*arg) != 0 || *arg == ':') {
4250                 /* Remove / if exists */
4251                 if ((p = strchr(arg, '/')) != NULL) {
4252                         *p = '\0';
4253                         mask = atoi(p + 1);
4254                 }
4255
4256                 if (inet_pton(AF_INET, arg, paddr) == 1) {
4257                         if (p != NULL && mask > 32)
4258                                 errx(EX_DATAERR, "bad IPv4 mask width: %s",
4259                                     p + 1);
4260
4261                         type = IPFW_TABLE_CIDR;
4262                         masklen = p ? mask : 32;
4263                         addrlen = sizeof(struct in_addr);
4264                 } else if (inet_pton(AF_INET6, arg, paddr) == 1) {
4265                         if (IN6_IS_ADDR_V4COMPAT(paddr))
4266                                 errx(EX_DATAERR,
4267                                     "Use IPv4 instead of v4-compatible");
4268                         if (p != NULL && mask > 128)
4269                                 errx(EX_DATAERR, "bad IPv6 mask width: %s",
4270                                     p + 1);
4271
4272                         type = IPFW_TABLE_CIDR;
4273                         masklen = p ? mask : 128;
4274                         addrlen = sizeof(struct in6_addr);
4275                 } else {
4276                         /* Port or any other key */
4277                         key = strtol(arg, &p, 10);
4278                         /* Skip non-base 10 entries like 'fa1' */
4279                         if (p != arg) {
4280                                 pkey = (uint32_t *)paddr;
4281                                 *pkey = htonl(key);
4282                                 type = IPFW_TABLE_CIDR;
4283                                 addrlen = sizeof(uint32_t);
4284                         }
4285                 }
4286         }
4287
4288         if (type == 0 && strchr(arg, '.') == NULL) {
4289                 /* Assume interface name. Copy significant data only */
4290                 mask = MIN(strlen(arg), IF_NAMESIZE - 1);
4291                 memcpy(xent->k.iface, arg, mask);
4292                 /* Set mask to exact match */
4293                 masklen = 8 * IF_NAMESIZE;
4294                 type = IPFW_TABLE_INTERFACE;
4295                 addrlen = IF_NAMESIZE;
4296         }
4297
4298         if (type == 0) {
4299                 if (lookup_host(arg, (struct in_addr *)paddr) != 0)
4300                         errx(EX_NOHOST, "hostname ``%s'' unknown", arg);
4301
4302                 masklen = 32;
4303                 type = IPFW_TABLE_CIDR;
4304                 addrlen = sizeof(struct in_addr);
4305         }
4306
4307         xent->type = type;
4308         xent->masklen = masklen;
4309         xent->len = offsetof(ipfw_table_xentry, k) + addrlen;
4310 }
4311
4312 static void
4313 table_list(uint16_t num, int need_header)
4314 {
4315         ipfw_xtable *tbl;
4316         ipfw_table_xentry *xent;
4317         socklen_t l;
4318         uint32_t *a, sz, tval;
4319         char tbuf[128];
4320         struct in6_addr *addr6;
4321         ip_fw3_opheader *op3;
4322
4323         /* Prepend value with IP_FW3 header */
4324         l = sizeof(ip_fw3_opheader) + sizeof(uint32_t);
4325         op3 = alloca(l);
4326         /* Zero reserved fields */
4327         memset(op3, 0, sizeof(ip_fw3_opheader));
4328         a = (uint32_t *)(op3 + 1);
4329         *a = num;
4330         op3->opcode = IP_FW_TABLE_XGETSIZE;
4331         if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0)
4332                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)");
4333
4334         /* If a is zero we have nothing to do, the table is empty. */
4335         if (*a == 0)
4336                 return;
4337
4338         l = *a;
4339         tbl = safe_calloc(1, l);
4340         tbl->opheader.opcode = IP_FW_TABLE_XLIST;
4341         tbl->tbl = num;
4342         if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0)
4343                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)");
4344         if (tbl->cnt && need_header)
4345                 printf("---table(%d)---\n", tbl->tbl);
4346         sz = tbl->size - sizeof(ipfw_xtable);
4347         xent = &tbl->xent[0];
4348         while (sz > 0) {
4349                 switch (tbl->type) {
4350                 case IPFW_TABLE_CIDR:
4351                         /* IPv4 or IPv6 prefixes */
4352                         tval = xent->value;
4353                         addr6 = &xent->k.addr6;
4354
4355
4356                         if (IN6_IS_ADDR_V4COMPAT(addr6)) {
4357                                 /* IPv4 address */
4358                                 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf));
4359                         } else {
4360                                 /* IPv6 address */
4361                                 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf));
4362                         }
4363
4364                         if (co.do_value_as_ip) {
4365                                 tval = htonl(tval);
4366                                 printf("%s/%u %s\n", tbuf, xent->masklen,
4367                                     inet_ntoa(*(struct in_addr *)&tval));
4368                         } else
4369                                 printf("%s/%u %u\n", tbuf, xent->masklen, tval);
4370                         break;
4371                 case IPFW_TABLE_INTERFACE:
4372                         /* Interface names */
4373                         tval = xent->value;
4374                         if (co.do_value_as_ip) {
4375                                 tval = htonl(tval);
4376                                 printf("%s %s\n", xent->k.iface,
4377                                     inet_ntoa(*(struct in_addr *)&tval));
4378                         } else
4379                                 printf("%s %u\n", xent->k.iface, tval);
4380                 }
4381
4382                 if (sz < xent->len)
4383                         break;
4384                 sz -= xent->len;
4385                 xent = (ipfw_table_xentry *)((char *)xent + xent->len);
4386         }
4387
4388         free(tbl);
4389 }