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 uint32_t ipfw_tables_max = 0; /* Number of tables supported by kernel */
  64
  65 #ifndef s6_addr32
  66 #define s6_addr32 __u6_addr.__u6_addr32
  67 #endif
  68
  69 #define CHECK_LENGTH(v, len) do {                               \
  70         if ((v) < (len))                                        \
  71                 errx(EX_DATAERR, "Rule too long");              \
  72         } while (0)
  73 /*
  74  * Check if we have enough space in cmd buffer. Note that since
  75  * first 8? u32 words are reserved by reserved header, full cmd
  76  * buffer can't be used, so we need to protect from buffer overrun
  77  * only. At the beginnig, cblen is less than actual buffer size by
  78  * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need
  79  * for checking small instructions fitting in given range.
  80  * We also (ab)use the fact that ipfw_insn is always the first field
  81  * for any custom instruction.
  82  */
  83 #define CHECK_CMDLEN    CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd))
  84
  85 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  86         if (!av[0])                                                     \
  87                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  88         if (_substrcmp(*av, "tablearg") == 0) {                         \
  89                 arg = IP_FW_TABLEARG;                                   \
  90                 break;                                                  \
  91         }                                                               \
  92                                                                         \
  93         {                                                               \
  94         long _xval;                                                     \
  95         char *end;                                                      \
  96                                                                         \
  97         _xval = strtol(*av, &end, 10);                                  \
  98                                                                         \
  99         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
 100                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
 101                     match_value(s_x, tok), *av);                        \
 102                                                                         \
 103         if (errno == ERANGE || _xval < min || _xval > max)              \
 104                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
 105                     match_value(s_x, tok), min, max, *av);              \
 106                                                                         \
 107         if (_xval == IP_FW_TABLEARG)                                    \
 108                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
 109                     match_value(s_x, tok), *av);                        \
 110         arg = _xval;                                                    \
 111         }                                                               \
 112 } while (0)
 113
 114 static void
 115 PRINT_UINT_ARG(const char *str, uint32_t arg)
 116 {
 117         if (str != NULL)
 118                 printf("%s",str);
 119         if (arg == IP_FW_TABLEARG)
 120                 printf("tablearg");
 121         else
 122                 printf("%u", arg);
 123 }
 124
 125 static struct _s_x f_tcpflags[] = {
 126         { "syn", TH_SYN },
 127         { "fin", TH_FIN },
 128         { "ack", TH_ACK },
 129         { "psh", TH_PUSH },
 130         { "rst", TH_RST },
 131         { "urg", TH_URG },
 132         { "tcp flag", 0 },
 133         { NULL, 0 }
 134 };
 135
 136 static struct _s_x f_tcpopts[] = {
 137         { "mss",        IP_FW_TCPOPT_MSS },
 138         { "maxseg",     IP_FW_TCPOPT_MSS },
 139         { "window",     IP_FW_TCPOPT_WINDOW },
 140         { "sack",       IP_FW_TCPOPT_SACK },
 141         { "ts",         IP_FW_TCPOPT_TS },
 142         { "timestamp",  IP_FW_TCPOPT_TS },
 143         { "cc",         IP_FW_TCPOPT_CC },
 144         { "tcp option", 0 },
 145         { NULL, 0 }
 146 };
 147
 148 /*
 149  * IP options span the range 0 to 255 so we need to remap them
 150  * (though in fact only the low 5 bits are significant).
 151  */
 152 static struct _s_x f_ipopts[] = {
 153         { "ssrr",       IP_FW_IPOPT_SSRR},
 154         { "lsrr",       IP_FW_IPOPT_LSRR},
 155         { "rr",         IP_FW_IPOPT_RR},
 156         { "ts",         IP_FW_IPOPT_TS},
 157         { "ip option",  0 },
 158         { NULL, 0 }
 159 };
 160
 161 static struct _s_x f_iptos[] = {
 162         { "lowdelay",   IPTOS_LOWDELAY},
 163         { "throughput", IPTOS_THROUGHPUT},
 164         { "reliability", IPTOS_RELIABILITY},
 165         { "mincost",    IPTOS_MINCOST},
 166         { "congestion", IPTOS_ECN_CE},
 167         { "ecntransport", IPTOS_ECN_ECT0},
 168         { "ip tos option", 0},
 169         { NULL, 0 }
 170 };
 171
 172 static struct _s_x f_ipdscp[] = {
 173         { "af11", IPTOS_DSCP_AF11 >> 2 },       /* 001010 */
 174         { "af12", IPTOS_DSCP_AF12 >> 2 },       /* 001100 */
 175         { "af13", IPTOS_DSCP_AF13 >> 2 },       /* 001110 */
 176         { "af21", IPTOS_DSCP_AF21 >> 2 },       /* 010010 */
 177         { "af22", IPTOS_DSCP_AF22 >> 2 },       /* 010100 */
 178         { "af23", IPTOS_DSCP_AF23 >> 2 },       /* 010110 */
 179         { "af31", IPTOS_DSCP_AF31 >> 2 },       /* 011010 */
 180         { "af32", IPTOS_DSCP_AF32 >> 2 },       /* 011100 */
 181         { "af33", IPTOS_DSCP_AF33 >> 2 },       /* 011110 */
 182         { "af41", IPTOS_DSCP_AF41 >> 2 },       /* 100010 */
 183         { "af42", IPTOS_DSCP_AF42 >> 2 },       /* 100100 */
 184         { "af43", IPTOS_DSCP_AF43 >> 2 },       /* 100110 */
 185         { "be", IPTOS_DSCP_CS0 >> 2 },  /* 000000 */
 186         { "ef", IPTOS_DSCP_EF >> 2 },   /* 101110 */
 187         { "cs0", IPTOS_DSCP_CS0 >> 2 }, /* 000000 */
 188         { "cs1", IPTOS_DSCP_CS1 >> 2 }, /* 001000 */
 189         { "cs2", IPTOS_DSCP_CS2 >> 2 }, /* 010000 */
 190         { "cs3", IPTOS_DSCP_CS3 >> 2 }, /* 011000 */
 191         { "cs4", IPTOS_DSCP_CS4 >> 2 }, /* 100000 */
 192         { "cs5", IPTOS_DSCP_CS5 >> 2 }, /* 101000 */
 193         { "cs6", IPTOS_DSCP_CS6 >> 2 }, /* 110000 */
 194         { "cs7", IPTOS_DSCP_CS7 >> 2 }, /* 100000 */
 195         { NULL, 0 }
 196 };
 197
 198 static struct _s_x limit_masks[] = {
 199         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 200         {"src-addr",    DYN_SRC_ADDR},
 201         {"src-port",    DYN_SRC_PORT},
 202         {"dst-addr",    DYN_DST_ADDR},
 203         {"dst-port",    DYN_DST_PORT},
 204         {NULL,          0}
 205 };
 206
 207 /*
 208  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 209  * This is only used in this code.
 210  */
 211 #define IPPROTO_ETHERTYPE       0x1000
 212 static struct _s_x ether_types[] = {
 213     /*
 214      * Note, we cannot use "-:&/" in the names because they are field
 215      * separators in the type specifications. Also, we use s = NULL as
 216      * end-delimiter, because a type of 0 can be legal.
 217      */
 218         { "ip",         0x0800 },
 219         { "ipv4",       0x0800 },
 220         { "ipv6",       0x86dd },
 221         { "arp",        0x0806 },
 222         { "rarp",       0x8035 },
 223         { "vlan",       0x8100 },
 224         { "loop",       0x9000 },
 225         { "trail",      0x1000 },
 226         { "at",         0x809b },
 227         { "atalk",      0x809b },
 228         { "aarp",       0x80f3 },
 229         { "pppoe_disc", 0x8863 },
 230         { "pppoe_sess", 0x8864 },
 231         { "ipx_8022",   0x00E0 },
 232         { "ipx_8023",   0x0000 },
 233         { "ipx_ii",     0x8137 },
 234         { "ipx_snap",   0x8137 },
 235         { "ipx",        0x8137 },
 236         { "ns",         0x0600 },
 237         { NULL,         0 }
 238 };
 239
 240
 241 static struct _s_x rule_actions[] = {
 242         { "accept",             TOK_ACCEPT },
 243         { "pass",               TOK_ACCEPT },
 244         { "allow",              TOK_ACCEPT },
 245         { "permit",             TOK_ACCEPT },
 246         { "count",              TOK_COUNT },
 247         { "pipe",               TOK_PIPE },
 248         { "queue",              TOK_QUEUE },
 249         { "divert",             TOK_DIVERT },
 250         { "tee",                TOK_TEE },
 251         { "netgraph",           TOK_NETGRAPH },
 252         { "ngtee",              TOK_NGTEE },
 253         { "fwd",                TOK_FORWARD },
 254         { "forward",            TOK_FORWARD },
 255         { "skipto",             TOK_SKIPTO },
 256         { "deny",               TOK_DENY },
 257         { "drop",               TOK_DENY },
 258         { "reject",             TOK_REJECT },
 259         { "reset6",             TOK_RESET6 },
 260         { "reset",              TOK_RESET },
 261         { "unreach6",           TOK_UNREACH6 },
 262         { "unreach",            TOK_UNREACH },
 263         { "check-state",        TOK_CHECKSTATE },
 264         { "//",                 TOK_COMMENT },
 265         { "nat",                TOK_NAT },
 266         { "reass",              TOK_REASS },
 267         { "setfib",             TOK_SETFIB },
 268         { "setdscp",            TOK_SETDSCP },
 269         { "call",               TOK_CALL },
 270         { "return",             TOK_RETURN },
 271         { NULL, 0 }     /* terminator */
 272 };
 273
 274 static struct _s_x rule_action_params[] = {
 275         { "altq",               TOK_ALTQ },
 276         { "log",                TOK_LOG },
 277         { "tag",                TOK_TAG },
 278         { "untag",              TOK_UNTAG },
 279         { NULL, 0 }     /* terminator */
 280 };
 281
 282 /*
 283  * The 'lookup' instruction accepts one of the following arguments.
 284  * -1 is a terminator for the list.
 285  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 286  */
 287 static int lookup_key[] = {
 288         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 289         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 290
 291 static struct _s_x rule_options[] = {
 292         { "tagged",             TOK_TAGGED },
 293         { "uid",                TOK_UID },
 294         { "gid",                TOK_GID },
 295         { "jail",               TOK_JAIL },
 296         { "in",                 TOK_IN },
 297         { "limit",              TOK_LIMIT },
 298         { "keep-state",         TOK_KEEPSTATE },
 299         { "bridged",            TOK_LAYER2 },
 300         { "layer2",             TOK_LAYER2 },
 301         { "out",                TOK_OUT },
 302         { "diverted",           TOK_DIVERTED },
 303         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 304         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 305         { "xmit",               TOK_XMIT },
 306         { "recv",               TOK_RECV },
 307         { "via",                TOK_VIA },
 308         { "fragment",           TOK_FRAG },
 309         { "frag",               TOK_FRAG },
 310         { "fib",                TOK_FIB },
 311         { "ipoptions",          TOK_IPOPTS },
 312         { "ipopts",             TOK_IPOPTS },
 313         { "iplen",              TOK_IPLEN },
 314         { "ipid",               TOK_IPID },
 315         { "ipprecedence",       TOK_IPPRECEDENCE },
 316         { "dscp",               TOK_DSCP },
 317         { "iptos",              TOK_IPTOS },
 318         { "ipttl",              TOK_IPTTL },
 319         { "ipversion",          TOK_IPVER },
 320         { "ipver",              TOK_IPVER },
 321         { "estab",              TOK_ESTAB },
 322         { "established",        TOK_ESTAB },
 323         { "setup",              TOK_SETUP },
 324         { "sockarg",            TOK_SOCKARG },
 325         { "tcpdatalen",         TOK_TCPDATALEN },
 326         { "tcpflags",           TOK_TCPFLAGS },
 327         { "tcpflgs",            TOK_TCPFLAGS },
 328         { "tcpoptions",         TOK_TCPOPTS },
 329         { "tcpopts",            TOK_TCPOPTS },
 330         { "tcpseq",             TOK_TCPSEQ },
 331         { "tcpack",             TOK_TCPACK },
 332         { "tcpwin",             TOK_TCPWIN },
 333         { "icmptype",           TOK_ICMPTYPES },
 334         { "icmptypes",          TOK_ICMPTYPES },
 335         { "dst-ip",             TOK_DSTIP },
 336         { "src-ip",             TOK_SRCIP },
 337         { "dst-port",           TOK_DSTPORT },
 338         { "src-port",           TOK_SRCPORT },
 339         { "proto",              TOK_PROTO },
 340         { "MAC",                TOK_MAC },
 341         { "mac",                TOK_MAC },
 342         { "mac-type",           TOK_MACTYPE },
 343         { "verrevpath",         TOK_VERREVPATH },
 344         { "versrcreach",        TOK_VERSRCREACH },
 345         { "antispoof",          TOK_ANTISPOOF },
 346         { "ipsec",              TOK_IPSEC },
 347         { "icmp6type",          TOK_ICMP6TYPES },
 348         { "icmp6types",         TOK_ICMP6TYPES },
 349         { "ext6hdr",            TOK_EXT6HDR},
 350         { "flow-id",            TOK_FLOWID},
 351         { "ipv6",               TOK_IPV6},
 352         { "ip6",                TOK_IPV6},
 353         { "ipv4",               TOK_IPV4},
 354         { "ip4",                TOK_IPV4},
 355         { "dst-ipv6",           TOK_DSTIP6},
 356         { "dst-ip6",            TOK_DSTIP6},
 357         { "src-ipv6",           TOK_SRCIP6},
 358         { "src-ip6",            TOK_SRCIP6},
 359         { "lookup",             TOK_LOOKUP},
 360         { "//",                 TOK_COMMENT },
 361
 362         { "not",                TOK_NOT },              /* pseudo option */
 363         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 364         { "or",                 TOK_OR },               /* pseudo option */
 365         { "|", /* escape */     TOK_OR },               /* pseudo option */
 366         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 367         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 368         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 369         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 370         { NULL, 0 }     /* terminator */
 371 };
 372
 373 /*
 374  * Helper routine to print a possibly unaligned uint64_t on
 375  * various platform. If width > 0, print the value with
 376  * the desired width, followed by a space;
 377  * otherwise, return the required width.
 378  */
 379 int
 380 pr_u64(uint64_t *pd, int width)
 381 {
 382 #ifdef TCC
 383 #define U64_FMT "I64"
 384 #else
 385 #define U64_FMT "llu"
 386 #endif
 387         uint64_t u;
 388         unsigned long long d;
 389
 390         bcopy (pd, &u, sizeof(u));
 391         d = u;
 392         return (width > 0) ?
 393                 printf("%*" U64_FMT " ", width, d) :
 394                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 395 #undef U64_FMT
 396 }
 397
 398 void *
 399 safe_calloc(size_t number, size_t size)
 400 {
 401         void *ret = calloc(number, size);
 402
 403         if (ret == NULL)
 404                 err(EX_OSERR, "calloc");
 405         return ret;
 406 }
 407
 408 void *
 409 safe_realloc(void *ptr, size_t size)
 410 {
 411         void *ret = realloc(ptr, size);
 412
 413         if (ret == NULL)
 414                 err(EX_OSERR, "realloc");
 415         return ret;
 416 }
 417
 418 /*
 419  * conditionally runs the command.
 420  * Selected options or negative -> getsockopt
 421  */
 422 int
 423 do_cmd(int optname, void *optval, uintptr_t optlen)
 424 {
 425         int i;
 426
 427         if (co.test_only)
 428                 return 0;
 429
 430         if (ipfw_socket == -1)
 431                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 432         if (ipfw_socket < 0)
 433                 err(EX_UNAVAILABLE, "socket");
 434
 435         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 436             optname == IP_FW_ADD || optname == IP_FW3 ||
 437             optname == IP_FW_NAT_GET_CONFIG ||
 438             optname < 0 ||
 439             optname == IP_FW_NAT_GET_LOG) {
 440                 if (optname < 0)
 441                         optname = -optname;
 442                 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval,
 443                         (socklen_t *)optlen);
 444         } else {
 445                 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen);
 446         }
 447         return i;
 448 }
 449
 450 /*
 451  * do_setcmd3 - pass ipfw control cmd to kernel
 452  * @optname: option name
 453  * @optval: pointer to option data
 454  * @optlen: option length
 455  *
 456  * Function encapsulates option value in IP_FW3 socket option
 457  * and calls setsockopt().
 458  * Function returns 0 on success or -1 otherwise.
 459  */
 460 static int
 461 do_setcmd3(int optname, void *optval, socklen_t optlen)
 462 {
 463         socklen_t len;
 464         ip_fw3_opheader *op3;
 465
 466         if (co.test_only)
 467                 return (0);
 468
 469         if (ipfw_socket == -1)
 470                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 471         if (ipfw_socket < 0)
 472                 err(EX_UNAVAILABLE, "socket");
 473
 474         len = sizeof(ip_fw3_opheader) + optlen;
 475         op3 = alloca(len);
 476         /* Zero reserved fields */
 477         memset(op3, 0, sizeof(ip_fw3_opheader));
 478         memcpy(op3 + 1, optval, optlen);
 479         op3->opcode = optname;
 480
 481         return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len);
 482 }
 483
 484 /**
 485  * match_token takes a table and a string, returns the value associated
 486  * with the string (-1 in case of failure).
 487  */
 488 int
 489 match_token(struct _s_x *table, char *string)
 490 {
 491         struct _s_x *pt;
 492         uint i = strlen(string);
 493
 494         for (pt = table ; i && pt->s != NULL ; pt++)
 495                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 496                         return pt->x;
 497         return -1;
 498 }
 499
 500 /**
 501  * match_value takes a table and a value, returns the string associated
 502  * with the value (NULL in case of failure).
 503  */
 504 char const *
 505 match_value(struct _s_x *p, int value)
 506 {
 507         for (; p->s != NULL; p++)
 508                 if (p->x == value)
 509                         return p->s;
 510         return NULL;
 511 }
 512
 513 /*
 514  * _substrcmp takes two strings and returns 1 if they do not match,
 515  * and 0 if they match exactly or the first string is a sub-string
 516  * of the second.  A warning is printed to stderr in the case that the
 517  * first string is a sub-string of the second.
 518  *
 519  * This function will be removed in the future through the usual
 520  * deprecation process.
 521  */
 522 int
 523 _substrcmp(const char *str1, const char* str2)
 524 {
 525
 526         if (strncmp(str1, str2, strlen(str1)) != 0)
 527                 return 1;
 528
 529         if (strlen(str1) != strlen(str2))
 530                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 531                     str1, str2);
 532         return 0;
 533 }
 534
 535 /*
 536  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 537  * and 0 if they match exactly or the second string is a sub-string
 538  * of the first.  A warning is printed to stderr in the case that the
 539  * first string does not match the third.
 540  *
 541  * This function exists to warn about the bizarre construction
 542  * strncmp(str, "by", 2) which is used to allow people to use a shortcut
 543  * for "bytes".  The problem is that in addition to accepting "by",
 544  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 545  * other string beginning with "by".
 546  *
 547  * This function will be removed in the future through the usual
 548  * deprecation process.
 549  */
 550 int
 551 _substrcmp2(const char *str1, const char* str2, const char* str3)
 552 {
 553
 554         if (strncmp(str1, str2, strlen(str2)) != 0)
 555                 return 1;
 556
 557         if (strcmp(str1, str3) != 0)
 558                 warnx("DEPRECATED: '%s' matched '%s'",
 559                     str1, str3);
 560         return 0;
 561 }
 562
 563 /*
 564  * prints one port, symbolic or numeric
 565  */
 566 static void
 567 print_port(int proto, uint16_t port)
 568 {
 569
 570         if (proto == IPPROTO_ETHERTYPE) {
 571                 char const *s;
 572
 573                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 574                         printf("%s", s);
 575                 else
 576                         printf("0x%04x", port);
 577         } else {
 578                 struct servent *se = NULL;
 579                 if (co.do_resolv) {
 580                         struct protoent *pe = getprotobynumber(proto);
 581
 582                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 583                 }
 584                 if (se)
 585                         printf("%s", se->s_name);
 586                 else
 587                         printf("%d", port);
 588         }
 589 }
 590
 591 static struct _s_x _port_name[] = {
 592         {"dst-port",    O_IP_DSTPORT},
 593         {"src-port",    O_IP_SRCPORT},
 594         {"ipid",        O_IPID},
 595         {"iplen",       O_IPLEN},
 596         {"ipttl",       O_IPTTL},
 597         {"mac-type",    O_MAC_TYPE},
 598         {"tcpdatalen",  O_TCPDATALEN},
 599         {"tcpwin",      O_TCPWIN},
 600         {"tagged",      O_TAGGED},
 601         {NULL,          0}
 602 };
 603
 604 /*
 605  * Print the values in a list 16-bit items of the types above.
 606  * XXX todo: add support for mask.
 607  */
 608 static void
 609 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 610 {
 611         uint16_t *p = cmd->ports;
 612         int i;
 613         char const *sep;
 614
 615         if (opcode != 0) {
 616                 sep = match_value(_port_name, opcode);
 617                 if (sep == NULL)
 618                         sep = "???";
 619                 printf (" %s", sep);
 620         }
 621         sep = " ";
 622         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 623                 printf("%s", sep);
 624                 print_port(proto, p[0]);
 625                 if (p[0] != p[1]) {
 626                         printf("-");
 627                         print_port(proto, p[1]);
 628                 }
 629                 sep = ",";
 630         }
 631 }
 632
 633 /*
 634  * Like strtol, but also translates service names into port numbers
 635  * for some protocols.
 636  * In particular:
 637  *      proto == -1 disables the protocol check;
 638  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 639  *      proto == <some value in /etc/protocols> matches the values there.
 640  * Returns *end == s in case the parameter is not found.
 641  */
 642 static int
 643 strtoport(char *s, char **end, int base, int proto)
 644 {
 645         char *p, *buf;
 646         char *s1;
 647         int i;
 648
 649         *end = s;               /* default - not found */
 650         if (*s == '\0')
 651                 return 0;       /* not found */
 652
 653         if (isdigit(*s))
 654                 return strtol(s, end, base);
 655
 656         /*
 657          * find separator. '\\' escapes the next char.
 658          */
 659         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 660                 if (*s1 == '\\' && s1[1] != '\0')
 661                         s1++;
 662
 663         buf = safe_calloc(s1 - s + 1, 1);
 664
 665         /*
 666          * copy into a buffer skipping backslashes
 667          */
 668         for (p = s, i = 0; p != s1 ; p++)
 669                 if (*p != '\\')
 670                         buf[i++] = *p;
 671         buf[i++] = '\0';
 672
 673         if (proto == IPPROTO_ETHERTYPE) {
 674                 i = match_token(ether_types, buf);
 675                 free(buf);
 676                 if (i != -1) {  /* found */
 677                         *end = s1;
 678                         return i;
 679                 }
 680         } else {
 681                 struct protoent *pe = NULL;
 682                 struct servent *se;
 683
 684                 if (proto != 0)
 685                         pe = getprotobynumber(proto);
 686                 setservent(1);
 687                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 688                 free(buf);
 689                 if (se != NULL) {
 690                         *end = s1;
 691                         return ntohs(se->s_port);
 692                 }
 693         }
 694         return 0;       /* not found */
 695 }
 696
 697 /*
 698  * Fill the body of the command with the list of port ranges.
 699  */
 700 static int
 701 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen)
 702 {
 703         uint16_t a, b, *p = cmd->ports;
 704         int i = 0;
 705         char *s = av;
 706
 707         while (*s) {
 708                 a = strtoport(av, &s, 0, proto);
 709                 if (s == av)                    /* empty or invalid argument */
 710                         return (0);
 711
 712                 CHECK_LENGTH(cblen, i + 2);
 713
 714                 switch (*s) {
 715                 case '-':                       /* a range */
 716                         av = s + 1;
 717                         b = strtoport(av, &s, 0, proto);
 718                         /* Reject expressions like '1-abc' or '1-2-3'. */
 719                         if (s == av || (*s != ',' && *s != '\0'))
 720                                 return (0);
 721                         p[0] = a;
 722                         p[1] = b;
 723                         break;
 724                 case ',':                       /* comma separated list */
 725                 case '\0':
 726                         p[0] = p[1] = a;
 727                         break;
 728                 default:
 729                         warnx("port list: invalid separator <%c> in <%s>",
 730                                 *s, av);
 731                         return (0);
 732                 }
 733
 734                 i++;
 735                 p += 2;
 736                 av = s + 1;
 737         }
 738         if (i > 0) {
 739                 if (i + 1 > F_LEN_MASK)
 740                         errx(EX_DATAERR, "too many ports/ranges\n");
 741                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 742         }
 743         return (i);
 744 }
 745
 746 /*
 747  * Fill the body of the command with the list of DiffServ codepoints.
 748  */
 749 static void
 750 fill_dscp(ipfw_insn *cmd, char *av, int cblen)
 751 {
 752         uint32_t *low, *high;
 753         char *s = av, *a;
 754         int code;
 755
 756         cmd->opcode = O_DSCP;
 757         cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1;
 758
 759         CHECK_CMDLEN;
 760
 761         low = (uint32_t *)(cmd + 1);
 762         high = low + 1;
 763
 764         *low = 0;
 765         *high = 0;
 766
 767         while (s != NULL) {
 768                 a = strchr(s, ',');
 769
 770                 if (a != NULL)
 771                         *a++ = '\0';
 772
 773                 if (isalpha(*s)) {
 774                         if ((code = match_token(f_ipdscp, s)) == -1)
 775                                 errx(EX_DATAERR, "Unknown DSCP code");
 776                 } else {
 777                         code = strtoul(s, NULL, 10);
 778                         if (code < 0 || code > 63)
 779                                 errx(EX_DATAERR, "Invalid DSCP value");
 780                 }
 781
 782                 if (code > 32)
 783                         *high |= 1 << (code - 32);
 784                 else
 785                         *low |= 1 << code;
 786
 787                 s = a;
 788         }
 789 }
 790
 791 static struct _s_x icmpcodes[] = {
 792       { "net",                  ICMP_UNREACH_NET },
 793       { "host",                 ICMP_UNREACH_HOST },
 794       { "protocol",             ICMP_UNREACH_PROTOCOL },
 795       { "port",                 ICMP_UNREACH_PORT },
 796       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 797       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 798       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 799       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 800       { "isolated",             ICMP_UNREACH_ISOLATED },
 801       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 802       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 803       { "tosnet",               ICMP_UNREACH_TOSNET },
 804       { "toshost",              ICMP_UNREACH_TOSHOST },
 805       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 806       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 807       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 808       { NULL, 0 }
 809 };
 810
 811 static void
 812 fill_reject_code(u_short *codep, char *str)
 813 {
 814         int val;
 815         char *s;
 816
 817         val = strtoul(str, &s, 0);
 818         if (s == str || *s != '\0' || val >= 0x100)
 819                 val = match_token(icmpcodes, str);
 820         if (val < 0)
 821                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 822         *codep = val;
 823         return;
 824 }
 825
 826 static void
 827 print_reject_code(uint16_t code)
 828 {
 829         char const *s = match_value(icmpcodes, code);
 830
 831         if (s != NULL)
 832                 printf("unreach %s", s);
 833         else
 834                 printf("unreach %u", code);
 835 }
 836
 837 /*
 838  * Returns the number of bits set (from left) in a contiguous bitmask,
 839  * or -1 if the mask is not contiguous.
 840  * XXX this needs a proper fix.
 841  * This effectively works on masks in big-endian (network) format.
 842  * when compiled on little endian architectures.
 843  *
 844  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 845  * the first bit on the wire is bit 0 of the first byte.
 846  * len is the max length in bits.
 847  */
 848 int
 849 contigmask(uint8_t *p, int len)
 850 {
 851         int i, n;
 852
 853         for (i=0; i<len ; i++)
 854                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 855                         break;
 856         for (n=i+1; n < len; n++)
 857                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 858                         return -1; /* mask not contiguous */
 859         return i;
 860 }
 861
 862 /*
 863  * print flags set/clear in the two bitmasks passed as parameters.
 864  * There is a specialized check for f_tcpflags.
 865  */
 866 static void
 867 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 868 {
 869         char const *comma = "";
 870         int i;
 871         uint8_t set = cmd->arg1 & 0xff;
 872         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 873
 874         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 875                 printf(" setup");
 876                 return;
 877         }
 878
 879         printf(" %s ", name);
 880         for (i=0; list[i].x != 0; i++) {
 881                 if (set & list[i].x) {
 882                         set &= ~list[i].x;
 883                         printf("%s%s", comma, list[i].s);
 884                         comma = ",";
 885                 }
 886                 if (clear & list[i].x) {
 887                         clear &= ~list[i].x;
 888                         printf("%s!%s", comma, list[i].s);
 889                         comma = ",";
 890                 }
 891         }
 892 }
 893
 894 /*
 895  * Print the ip address contained in a command.
 896  */
 897 static void
 898 print_ip(ipfw_insn_ip *cmd, char const *s)
 899 {
 900         struct hostent *he = NULL;
 901         uint32_t len = F_LEN((ipfw_insn *)cmd);
 902         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 903
 904         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 905                 uint32_t d = a[1];
 906                 const char *arg = "<invalid>";
 907
 908                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 909                         arg = match_value(rule_options, lookup_key[d]);
 910                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 911                         arg, cmd->o.arg1);
 912                 return;
 913         }
 914         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 915
 916         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 917                 printf("me");
 918                 return;
 919         }
 920         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 921             cmd->o.opcode == O_IP_DST_LOOKUP) {
 922                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 923                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 924                         printf(",%u", *a);
 925                 printf(")");
 926                 return;
 927         }
 928         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 929                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 930                 int i, j;
 931                 char comma = '{';
 932
 933                 x = cmd->o.arg1 - 1;
 934                 x = htonl( ~x );
 935                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 936                 printf("%s/%d", inet_ntoa(cmd->addr),
 937                         contigmask((uint8_t *)&x, 32));
 938                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 939                 x &= 0xff; /* base */
 940                 /*
 941                  * Print bits and ranges.
 942                  * Locate first bit set (i), then locate first bit unset (j).
 943                  * If we have 3+ consecutive bits set, then print them as a
 944                  * range, otherwise only print the initial bit and rescan.
 945                  */
 946                 for (i=0; i < cmd->o.arg1; i++)
 947                         if (map[i/32] & (1<<(i & 31))) {
 948                                 for (j=i+1; j < cmd->o.arg1; j++)
 949                                         if (!(map[ j/32] & (1<<(j & 31))))
 950                                                 break;
 951                                 printf("%c%d", comma, i+x);
 952                                 if (j>i+2) { /* range has at least 3 elements */
 953                                         printf("-%d", j-1+x);
 954                                         i = j-1;
 955                                 }
 956                                 comma = ',';
 957                         }
 958                 printf("}");
 959                 return;
 960         }
 961         /*
 962          * len == 2 indicates a single IP, whereas lists of 1 or more
 963          * addr/mask pairs have len = (2n+1). We convert len to n so we
 964          * use that to count the number of entries.
 965          */
 966     for (len = len / 2; len > 0; len--, a += 2) {
 967         int mb =        /* mask length */
 968             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 969                 32 : contigmask((uint8_t *)&(a[1]), 32);
 970         if (mb == 32 && co.do_resolv)
 971                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 972         if (he != NULL)         /* resolved to name */
 973                 printf("%s", he->h_name);
 974         else if (mb == 0)       /* any */
 975                 printf("any");
 976         else {          /* numeric IP followed by some kind of mask */
 977                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 978                 if (mb < 0)
 979                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 980                 else if (mb < 32)
 981                         printf("/%d", mb);
 982         }
 983         if (len > 1)
 984                 printf(",");
 985     }
 986 }
 987
 988 /*
 989  * prints a MAC address/mask pair
 990  */
 991 static void
 992 print_mac(uint8_t *addr, uint8_t *mask)
 993 {
 994         int l = contigmask(mask, 48);
 995
 996         if (l == 0)
 997                 printf(" any");
 998         else {
 999                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
1000                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
1001                 if (l == -1)
1002                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
1003                             mask[0], mask[1], mask[2],
1004                             mask[3], mask[4], mask[5]);
1005                 else if (l < 48)
1006                         printf("/%d", l);
1007         }
1008 }
1009
1010 static void
1011 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
1012 {
1013         uint8_t type;
1014
1015         cmd->d[0] = 0;
1016         while (*av) {
1017                 if (*av == ',')
1018                         av++;
1019
1020                 type = strtoul(av, &av, 0);
1021
1022                 if (*av != ',' && *av != '\0')
1023                         errx(EX_DATAERR, "invalid ICMP type");
1024
1025                 if (type > 31)
1026                         errx(EX_DATAERR, "ICMP type out of range");
1027
1028                 cmd->d[0] |= 1 << type;
1029         }
1030         cmd->o.opcode = O_ICMPTYPE;
1031         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1032 }
1033
1034 static void
1035 print_icmptypes(ipfw_insn_u32 *cmd)
1036 {
1037         int i;
1038         char sep= ' ';
1039
1040         printf(" icmptypes");
1041         for (i = 0; i < 32; i++) {
1042                 if ( (cmd->d[0] & (1 << (i))) == 0)
1043                         continue;
1044                 printf("%c%d", sep, i);
1045                 sep = ',';
1046         }
1047 }
1048
1049 static void
1050 print_dscp(ipfw_insn_u32 *cmd)
1051 {
1052         int i, c;
1053         uint32_t *v;
1054         char sep= ' ';
1055         const char *code;
1056
1057         printf(" dscp");
1058         i = 0;
1059         c = 0;
1060         v = cmd->d;
1061         while (i < 64) {
1062                 if (*v & (1 << i)) {
1063                         if ((code = match_value(f_ipdscp, i)) != NULL)
1064                                 printf("%c%s", sep, code);
1065                         else
1066                                 printf("%c%d", sep, i);
1067                         sep = ',';
1068                 }
1069
1070                 if ((++i % 32) == 0)
1071                         v++;
1072         }
1073 }
1074
1075 /*
1076  * show_ipfw() prints the body of an ipfw rule.
1077  * Because the standard rule has at least proto src_ip dst_ip, we use
1078  * a helper function to produce these entries if not provided explicitly.
1079  * The first argument is the list of fields we have, the second is
1080  * the list of fields we want to be printed.
1081  *
1082  * Special cases if we have provided a MAC header:
1083  *   + if the rule does not contain IP addresses/ports, do not print them;
1084  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
1085  *
1086  * Once we have 'have_options', IP header fields are printed as options.
1087  */
1088 #define HAVE_PROTO      0x0001
1089 #define HAVE_SRCIP      0x0002
1090 #define HAVE_DSTIP      0x0004
1091 #define HAVE_PROTO4     0x0008
1092 #define HAVE_PROTO6     0x0010
1093 #define HAVE_IP         0x0100
1094 #define HAVE_OPTIONS    0x8000
1095
1096 static void
1097 show_prerequisites(int *flags, int want, int cmd)
1098 {
1099         (void)cmd;      /* UNUSED */
1100         if (co.comment_only)
1101                 return;
1102         if ( (*flags & HAVE_IP) == HAVE_IP)
1103                 *flags |= HAVE_OPTIONS;
1104
1105         if ( !(*flags & HAVE_OPTIONS)) {
1106                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
1107                         if ( (*flags & HAVE_PROTO4))
1108                                 printf(" ip4");
1109                         else if ( (*flags & HAVE_PROTO6))
1110                                 printf(" ip6");
1111                         else
1112                                 printf(" ip");
1113                 }
1114                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
1115                         printf(" from any");
1116                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
1117                         printf(" to any");
1118         }
1119         *flags |= want;
1120 }
1121
1122 static void
1123 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
1124 {
1125         static int twidth = 0;
1126         int l;
1127         ipfw_insn *cmd, *tagptr = NULL;
1128         const char *comment = NULL;     /* ptr to comment if we have one */
1129         int proto = 0;          /* default */
1130         int flags = 0;  /* prerequisites */
1131         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
1132         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
1133         int or_block = 0;       /* we are in an or block */
1134         uint32_t set_disable;
1135
1136         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
1137
1138         if (set_disable & (1 << rule->set)) { /* disabled */
1139                 if (!co.show_sets)
1140                         return;
1141                 else
1142                         printf("# DISABLED ");
1143         }
1144         printf("%05u ", rule->rulenum);
1145
1146         if (pcwidth > 0 || bcwidth > 0) {
1147                 pr_u64(&rule->pcnt, pcwidth);
1148                 pr_u64(&rule->bcnt, bcwidth);
1149         }
1150
1151         if (co.do_time == 2)
1152                 printf("%10u ", rule->timestamp);
1153         else if (co.do_time == 1) {
1154                 char timestr[30];
1155                 time_t t = (time_t)0;
1156
1157                 if (twidth == 0) {
1158                         strcpy(timestr, ctime(&t));
1159                         *strchr(timestr, '\n') = '\0';
1160                         twidth = strlen(timestr);
1161                 }
1162                 if (rule->timestamp) {
1163                         t = _long_to_time(rule->timestamp);
1164
1165                         strcpy(timestr, ctime(&t));
1166                         *strchr(timestr, '\n') = '\0';
1167                         printf("%s ", timestr);
1168                 } else {
1169                         printf("%*s", twidth, " ");
1170                 }
1171         }
1172
1173         if (co.show_sets)
1174                 printf("set %d ", rule->set);
1175
1176         /*
1177          * print the optional "match probability"
1178          */
1179         if (rule->cmd_len > 0) {
1180                 cmd = rule->cmd ;
1181                 if (cmd->opcode == O_PROB) {
1182                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1183                         double d = 1.0 * p->d[0];
1184
1185                         d = (d / 0x7fffffff);
1186                         printf("prob %f ", d);
1187                 }
1188         }
1189
1190         /*
1191          * first print actions
1192          */
1193         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1194                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1195                 switch(cmd->opcode) {
1196                 case O_CHECK_STATE:
1197                         printf("check-state");
1198                         /* avoid printing anything else */
1199                         flags = HAVE_PROTO | HAVE_SRCIP |
1200                                 HAVE_DSTIP | HAVE_IP;
1201                         break;
1202
1203                 case O_ACCEPT:
1204                         printf("allow");
1205                         break;
1206
1207                 case O_COUNT:
1208                         printf("count");
1209                         break;
1210
1211                 case O_DENY:
1212                         printf("deny");
1213                         break;
1214
1215                 case O_REJECT:
1216                         if (cmd->arg1 == ICMP_REJECT_RST)
1217                                 printf("reset");
1218                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1219                                 printf("reject");
1220                         else
1221                                 print_reject_code(cmd->arg1);
1222                         break;
1223
1224                 case O_UNREACH6:
1225                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1226                                 printf("reset6");
1227                         else
1228                                 print_unreach6_code(cmd->arg1);
1229                         break;
1230
1231                 case O_SKIPTO:
1232                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1233                         break;
1234
1235                 case O_PIPE:
1236                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1237                         break;
1238
1239                 case O_QUEUE:
1240                         PRINT_UINT_ARG("queue ", cmd->arg1);
1241                         break;
1242
1243                 case O_DIVERT:
1244                         PRINT_UINT_ARG("divert ", cmd->arg1);
1245                         break;
1246
1247                 case O_TEE:
1248                         PRINT_UINT_ARG("tee ", cmd->arg1);
1249                         break;
1250
1251                 case O_NETGRAPH:
1252                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1253                         break;
1254
1255                 case O_NGTEE:
1256                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1257                         break;
1258
1259                 case O_FORWARD_IP:
1260                     {
1261                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1262
1263                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1264                                 printf("fwd tablearg");
1265                         } else {
1266                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1267                         }
1268                         if (s->sa.sin_port)
1269                                 printf(",%d", s->sa.sin_port);
1270                     }
1271                         break;
1272
1273                 case O_FORWARD_IP6:
1274                     {
1275                         char buf[4 + INET6_ADDRSTRLEN + 1];
1276                         ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd;
1277
1278                         printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr,
1279                             buf, sizeof(buf)));
1280                         if (s->sa.sin6_port)
1281                                 printf(",%d", s->sa.sin6_port);
1282                     }
1283                         break;
1284
1285                 case O_LOG: /* O_LOG is printed last */
1286                         logptr = (ipfw_insn_log *)cmd;
1287                         break;
1288
1289                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1290                         altqptr = (ipfw_insn_altq *)cmd;
1291                         break;
1292
1293                 case O_TAG:
1294                         tagptr = cmd;
1295                         break;
1296
1297                 case O_NAT:
1298                         if (cmd->arg1 != 0)
1299                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1300                         else
1301                                 printf("nat global");
1302                         break;
1303
1304                 case O_SETFIB:
1305                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1306                         break;
1307
1308                 case O_SETDSCP:
1309                     {
1310                         const char *code;
1311
1312                         if ((code = match_value(f_ipdscp, cmd->arg1)) != NULL)
1313                                 printf("setdscp %s", code);
1314                         else
1315                                 PRINT_UINT_ARG("setdscp ", cmd->arg1);
1316                     }
1317                         break;
1318
1319                 case O_REASS:
1320                         printf("reass");
1321                         break;
1322
1323                 case O_CALLRETURN:
1324                         if (cmd->len & F_NOT)
1325                                 printf("return");
1326                         else
1327                                 PRINT_UINT_ARG("call ", cmd->arg1);
1328                         break;
1329
1330                 default:
1331                         printf("** unrecognized action %d len %d ",
1332                                 cmd->opcode, cmd->len);
1333                 }
1334         }
1335         if (logptr) {
1336                 if (logptr->max_log > 0)
1337                         printf(" log logamount %d", logptr->max_log);
1338                 else
1339                         printf(" log");
1340         }
1341 #ifndef NO_ALTQ
1342         if (altqptr) {
1343                 print_altq_cmd(altqptr);
1344         }
1345 #endif
1346         if (tagptr) {
1347                 if (tagptr->len & F_NOT)
1348                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1349                 else
1350                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1351         }
1352
1353         /*
1354          * then print the body.
1355          */
1356         for (l = rule->act_ofs, cmd = rule->cmd ;
1357                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1358                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1359                         continue;
1360                 if (cmd->opcode == O_IP4) {
1361                         flags |= HAVE_PROTO4;
1362                         break;
1363                 } else if (cmd->opcode == O_IP6) {
1364                         flags |= HAVE_PROTO6;
1365                         break;
1366                 }
1367         }
1368         if (rule->_pad & 1) {   /* empty rules before options */
1369                 if (!co.do_compact) {
1370                         show_prerequisites(&flags, HAVE_PROTO, 0);
1371                         printf(" from any to any");
1372                 }
1373                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1374                          HAVE_SRCIP | HAVE_DSTIP;
1375         }
1376
1377         if (co.comment_only)
1378                 comment = "...";
1379
1380         for (l = rule->act_ofs, cmd = rule->cmd ;
1381                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1382                 /* useful alias */
1383                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1384
1385                 if (co.comment_only) {
1386                         if (cmd->opcode != O_NOP)
1387                                 continue;
1388                         printf(" // %s\n", (char *)(cmd + 1));
1389                         return;
1390                 }
1391
1392                 show_prerequisites(&flags, 0, cmd->opcode);
1393
1394                 switch(cmd->opcode) {
1395                 case O_PROB:
1396                         break;  /* done already */
1397
1398                 case O_PROBE_STATE:
1399                         break; /* no need to print anything here */
1400
1401                 case O_IP_SRC:
1402                 case O_IP_SRC_LOOKUP:
1403                 case O_IP_SRC_MASK:
1404                 case O_IP_SRC_ME:
1405                 case O_IP_SRC_SET:
1406                         show_prerequisites(&flags, HAVE_PROTO, 0);
1407                         if (!(flags & HAVE_SRCIP))
1408                                 printf(" from");
1409                         if ((cmd->len & F_OR) && !or_block)
1410                                 printf(" {");
1411                         print_ip((ipfw_insn_ip *)cmd,
1412                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1413                         flags |= HAVE_SRCIP;
1414                         break;
1415
1416                 case O_IP_DST:
1417                 case O_IP_DST_LOOKUP:
1418                 case O_IP_DST_MASK:
1419                 case O_IP_DST_ME:
1420                 case O_IP_DST_SET:
1421                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1422                         if (!(flags & HAVE_DSTIP))
1423                                 printf(" to");
1424                         if ((cmd->len & F_OR) && !or_block)
1425                                 printf(" {");
1426                         print_ip((ipfw_insn_ip *)cmd,
1427                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1428                         flags |= HAVE_DSTIP;
1429                         break;
1430
1431                 case O_IP6_SRC:
1432                 case O_IP6_SRC_MASK:
1433                 case O_IP6_SRC_ME:
1434                         show_prerequisites(&flags, HAVE_PROTO, 0);
1435                         if (!(flags & HAVE_SRCIP))
1436                                 printf(" from");
1437                         if ((cmd->len & F_OR) && !or_block)
1438                                 printf(" {");
1439                         print_ip6((ipfw_insn_ip6 *)cmd,
1440                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1441                         flags |= HAVE_SRCIP | HAVE_PROTO;
1442                         break;
1443
1444                 case O_IP6_DST:
1445                 case O_IP6_DST_MASK:
1446                 case O_IP6_DST_ME:
1447                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1448                         if (!(flags & HAVE_DSTIP))
1449                                 printf(" to");
1450                         if ((cmd->len & F_OR) && !or_block)
1451                                 printf(" {");
1452                         print_ip6((ipfw_insn_ip6 *)cmd,
1453                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1454                         flags |= HAVE_DSTIP;
1455                         break;
1456
1457                 case O_FLOW6ID:
1458                 print_flow6id( (ipfw_insn_u32 *) cmd );
1459                 flags |= HAVE_OPTIONS;
1460                 break;
1461
1462                 case O_IP_DSTPORT:
1463                         show_prerequisites(&flags,
1464                                 HAVE_PROTO | HAVE_SRCIP |
1465                                 HAVE_DSTIP | HAVE_IP, 0);
1466                 case O_IP_SRCPORT:
1467                         if (flags & HAVE_DSTIP)
1468                                 flags |= HAVE_IP;
1469                         show_prerequisites(&flags,
1470                                 HAVE_PROTO | HAVE_SRCIP, 0);
1471                         if ((cmd->len & F_OR) && !or_block)
1472                                 printf(" {");
1473                         if (cmd->len & F_NOT)
1474                                 printf(" not");
1475                         print_newports((ipfw_insn_u16 *)cmd, proto,
1476                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1477                         break;
1478
1479                 case O_PROTO: {
1480                         struct protoent *pe = NULL;
1481
1482                         if ((cmd->len & F_OR) && !or_block)
1483                                 printf(" {");
1484                         if (cmd->len & F_NOT)
1485                                 printf(" not");
1486                         proto = cmd->arg1;
1487                         pe = getprotobynumber(cmd->arg1);
1488                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1489                             !(flags & HAVE_PROTO))
1490                                 show_prerequisites(&flags,
1491                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1492                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1493                         if (flags & HAVE_OPTIONS)
1494                                 printf(" proto");
1495                         if (pe)
1496                                 printf(" %s", pe->p_name);
1497                         else
1498                                 printf(" %u", cmd->arg1);
1499                         }
1500                         flags |= HAVE_PROTO;
1501                         break;
1502
1503                 default: /*options ... */
1504                         if (!(cmd->len & (F_OR|F_NOT)))
1505                                 if (((cmd->opcode == O_IP6) &&
1506                                     (flags & HAVE_PROTO6)) ||
1507                                     ((cmd->opcode == O_IP4) &&
1508                                     (flags & HAVE_PROTO4)))
1509                                         break;
1510                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1511                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1512                         if ((cmd->len & F_OR) && !or_block)
1513                                 printf(" {");
1514                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1515                                 printf(" not");
1516                         switch(cmd->opcode) {
1517                         case O_MACADDR2: {
1518                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1519
1520                                 printf(" MAC");
1521                                 print_mac(m->addr, m->mask);
1522                                 print_mac(m->addr + 6, m->mask + 6);
1523                                 }
1524                                 break;
1525
1526                         case O_MAC_TYPE:
1527                                 print_newports((ipfw_insn_u16 *)cmd,
1528                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1529                                 break;
1530
1531
1532                         case O_FRAG:
1533                                 printf(" frag");
1534                                 break;
1535
1536                         case O_FIB:
1537                                 printf(" fib %u", cmd->arg1 );
1538                                 break;
1539                         case O_SOCKARG:
1540                                 printf(" sockarg");
1541                                 break;
1542
1543                         case O_IN:
1544                                 printf(cmd->len & F_NOT ? " out" : " in");
1545                                 break;
1546
1547                         case O_DIVERTED:
1548                                 switch (cmd->arg1) {
1549                                 case 3:
1550                                         printf(" diverted");
1551                                         break;
1552                                 case 1:
1553                                         printf(" diverted-loopback");
1554                                         break;
1555                                 case 2:
1556                                         printf(" diverted-output");
1557                                         break;
1558                                 default:
1559                                         printf(" diverted-?<%u>", cmd->arg1);
1560                                         break;
1561                                 }
1562                                 break;
1563
1564                         case O_LAYER2:
1565                                 printf(" layer2");
1566                                 break;
1567                         case O_XMIT:
1568                         case O_RECV:
1569                         case O_VIA:
1570                             {
1571                                 char const *s;
1572                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1573
1574                                 if (cmd->opcode == O_XMIT)
1575                                         s = "xmit";
1576                                 else if (cmd->opcode == O_RECV)
1577                                         s = "recv";
1578                                 else /* if (cmd->opcode == O_VIA) */
1579                                         s = "via";
1580                                 if (cmdif->name[0] == '\0')
1581                                         printf(" %s %s", s,
1582                                             inet_ntoa(cmdif->p.ip));
1583                                 else if (cmdif->name[0] == '\1') /* interface table */
1584                                         printf(" %s table(%d)", s, cmdif->p.glob);
1585                                 else
1586                                         printf(" %s %s", s, cmdif->name);
1587
1588                                 break;
1589                             }
1590                         case O_IPID:
1591                                 if (F_LEN(cmd) == 1)
1592                                     printf(" ipid %u", cmd->arg1 );
1593                                 else
1594                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1595                                         O_IPID);
1596                                 break;
1597
1598                         case O_IPTTL:
1599                                 if (F_LEN(cmd) == 1)
1600                                     printf(" ipttl %u", cmd->arg1 );
1601                                 else
1602                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1603                                         O_IPTTL);
1604                                 break;
1605
1606                         case O_IPVER:
1607                                 printf(" ipver %u", cmd->arg1 );
1608                                 break;
1609
1610                         case O_IPPRECEDENCE:
1611                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1612                                 break;
1613
1614                         case O_DSCP:
1615                                 print_dscp((ipfw_insn_u32 *)cmd);
1616                                 break;
1617
1618                         case O_IPLEN:
1619                                 if (F_LEN(cmd) == 1)
1620                                     printf(" iplen %u", cmd->arg1 );
1621                                 else
1622                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1623                                         O_IPLEN);
1624                                 break;
1625
1626                         case O_IPOPT:
1627                                 print_flags("ipoptions", cmd, f_ipopts);
1628                                 break;
1629
1630                         case O_IPTOS:
1631                                 print_flags("iptos", cmd, f_iptos);
1632                                 break;
1633
1634                         case O_ICMPTYPE:
1635                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1636                                 break;
1637
1638                         case O_ESTAB:
1639                                 printf(" established");
1640                                 break;
1641
1642                         case O_TCPDATALEN:
1643                                 if (F_LEN(cmd) == 1)
1644                                     printf(" tcpdatalen %u", cmd->arg1 );
1645                                 else
1646                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1647                                         O_TCPDATALEN);
1648                                 break;
1649
1650                         case O_TCPFLAGS:
1651                                 print_flags("tcpflags", cmd, f_tcpflags);
1652                                 break;
1653
1654                         case O_TCPOPTS:
1655                                 print_flags("tcpoptions", cmd, f_tcpopts);
1656                                 break;
1657
1658                         case O_TCPWIN:
1659                                 if (F_LEN(cmd) == 1)
1660                                     printf(" tcpwin %u", cmd->arg1);
1661                                 else
1662                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1663                                         O_TCPWIN);
1664                                 break;
1665
1666                         case O_TCPACK:
1667                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1668                                 break;
1669
1670                         case O_TCPSEQ:
1671                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1672                                 break;
1673
1674                         case O_UID:
1675                             {
1676                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1677
1678                                 if (pwd)
1679                                         printf(" uid %s", pwd->pw_name);
1680                                 else
1681                                         printf(" uid %u", cmd32->d[0]);
1682                             }
1683                                 break;
1684
1685                         case O_GID:
1686                             {
1687                                 struct group *grp = getgrgid(cmd32->d[0]);
1688
1689                                 if (grp)
1690                                         printf(" gid %s", grp->gr_name);
1691                                 else
1692                                         printf(" gid %u", cmd32->d[0]);
1693                             }
1694                                 break;
1695
1696                         case O_JAIL:
1697                                 printf(" jail %d", cmd32->d[0]);
1698                                 break;
1699
1700                         case O_VERREVPATH:
1701                                 printf(" verrevpath");
1702                                 break;
1703
1704                         case O_VERSRCREACH:
1705                                 printf(" versrcreach");
1706                                 break;
1707
1708                         case O_ANTISPOOF:
1709                                 printf(" antispoof");
1710                                 break;
1711
1712                         case O_IPSEC:
1713                                 printf(" ipsec");
1714                                 break;
1715
1716                         case O_NOP:
1717                                 comment = (char *)(cmd + 1);
1718                                 break;
1719
1720                         case O_KEEP_STATE:
1721                                 printf(" keep-state");
1722                                 break;
1723
1724                         case O_LIMIT: {
1725                                 struct _s_x *p = limit_masks;
1726                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1727                                 uint8_t x = c->limit_mask;
1728                                 char const *comma = " ";
1729
1730                                 printf(" limit");
1731                                 for (; p->x != 0 ; p++)
1732                                         if ((x & p->x) == p->x) {
1733                                                 x &= ~p->x;
1734                                                 printf("%s%s", comma, p->s);
1735                                                 comma = ",";
1736                                         }
1737                                 PRINT_UINT_ARG(" ", c->conn_limit);
1738                                 break;
1739                         }
1740
1741                         case O_IP6:
1742                                 printf(" ip6");
1743                                 break;
1744
1745                         case O_IP4:
1746                                 printf(" ip4");
1747                                 break;
1748
1749                         case O_ICMP6TYPE:
1750                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1751                                 break;
1752
1753                         case O_EXT_HDR:
1754                                 print_ext6hdr( (ipfw_insn *) cmd );
1755                                 break;
1756
1757                         case O_TAGGED:
1758                                 if (F_LEN(cmd) == 1)
1759                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1760                                 else
1761                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1762                                             O_TAGGED);
1763                                 break;
1764
1765                         default:
1766                                 printf(" [opcode %d len %d]",
1767                                     cmd->opcode, cmd->len);
1768                         }
1769                 }
1770                 if (cmd->len & F_OR) {
1771                         printf(" or");
1772                         or_block = 1;
1773                 } else if (or_block) {
1774                         printf(" }");
1775                         or_block = 0;
1776                 }
1777         }
1778         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1779                                               | HAVE_IP, 0);
1780         if (comment)
1781                 printf(" // %s", comment);
1782         printf("\n");
1783 }
1784
1785 static void
1786 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1787 {
1788         struct protoent *pe;
1789         struct in_addr a;
1790         uint16_t rulenum;
1791         char buf[INET6_ADDRSTRLEN];
1792
1793         if (!co.do_expired) {
1794                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1795                         return;
1796         }
1797         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1798         printf("%05d", rulenum);
1799         if (pcwidth > 0 || bcwidth > 0) {
1800                 printf(" ");
1801                 pr_u64(&d->pcnt, pcwidth);
1802                 pr_u64(&d->bcnt, bcwidth);
1803                 printf("(%ds)", d->expire);
1804         }
1805         switch (d->dyn_type) {
1806         case O_LIMIT_PARENT:
1807                 printf(" PARENT %d", d->count);
1808                 break;
1809         case O_LIMIT:
1810                 printf(" LIMIT");
1811                 break;
1812         case O_KEEP_STATE: /* bidir, no mask */
1813                 printf(" STATE");
1814                 break;
1815         }
1816
1817         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1818                 printf(" %s", pe->p_name);
1819         else
1820                 printf(" proto %u", d->id.proto);
1821
1822         if (d->id.addr_type == 4) {
1823                 a.s_addr = htonl(d->id.src_ip);
1824                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1825
1826                 a.s_addr = htonl(d->id.dst_ip);
1827                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1828         } else if (d->id.addr_type == 6) {
1829                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1830                     sizeof(buf)), d->id.src_port);
1831                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1832                     sizeof(buf)), d->id.dst_port);
1833         } else
1834                 printf(" UNKNOWN <-> UNKNOWN\n");
1835
1836         printf("\n");
1837 }
1838
1839 /*
1840  * This one handles all set-related commands
1841  *      ipfw set { show | enable | disable }
1842  *      ipfw set swap X Y
1843  *      ipfw set move X to Y
1844  *      ipfw set move rule X to Y
1845  */
1846 void
1847 ipfw_sets_handler(char *av[])
1848 {
1849         uint32_t set_disable, masks[2];
1850         int i, nbytes;
1851         uint16_t rulenum;
1852         uint8_t cmd, new_set;
1853
1854         av++;
1855
1856         if (av[0] == NULL)
1857                 errx(EX_USAGE, "set needs command");
1858         if (_substrcmp(*av, "show") == 0) {
1859                 void *data = NULL;
1860                 char const *msg;
1861                 int nalloc;
1862
1863                 nalloc = nbytes = sizeof(struct ip_fw);
1864                 while (nbytes >= nalloc) {
1865                         if (data)
1866                                 free(data);
1867                         nalloc = nalloc * 2 + 200;
1868                         nbytes = nalloc;
1869                         data = safe_calloc(1, nbytes);
1870                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1871                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1872                 }
1873
1874                 bcopy(&((struct ip_fw *)data)->next_rule,
1875                         &set_disable, sizeof(set_disable));
1876
1877                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1878                         if ((set_disable & (1<<i))) {
1879                                 printf("%s %d", msg, i);
1880                                 msg = "";
1881                         }
1882                 msg = (set_disable) ? " enable" : "enable";
1883                 for (i = 0; i < RESVD_SET; i++)
1884                         if (!(set_disable & (1<<i))) {
1885                                 printf("%s %d", msg, i);
1886                                 msg = "";
1887                         }
1888                 printf("\n");
1889         } else if (_substrcmp(*av, "swap") == 0) {
1890                 av++;
1891                 if ( av[0] == NULL || av[1] == NULL )
1892                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1893                 rulenum = atoi(av[0]);
1894                 new_set = atoi(av[1]);
1895                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1896                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1897                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1898                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1899                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1900                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1901         } else if (_substrcmp(*av, "move") == 0) {
1902                 av++;
1903                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1904                         cmd = 2;
1905                         av++;
1906                 } else
1907                         cmd = 3;
1908                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1909                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1910                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1911                 rulenum = atoi(av[0]);
1912                 new_set = atoi(av[2]);
1913                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1914                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1915                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1916                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1917                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1918                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1919                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1920         } else if (_substrcmp(*av, "disable") == 0 ||
1921                    _substrcmp(*av, "enable") == 0 ) {
1922                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1923
1924                 av++;
1925                 masks[0] = masks[1] = 0;
1926
1927                 while (av[0]) {
1928                         if (isdigit(**av)) {
1929                                 i = atoi(*av);
1930                                 if (i < 0 || i > RESVD_SET)
1931                                         errx(EX_DATAERR,
1932                                             "invalid set number %d\n", i);
1933                                 masks[which] |= (1<<i);
1934                         } else if (_substrcmp(*av, "disable") == 0)
1935                                 which = 0;
1936                         else if (_substrcmp(*av, "enable") == 0)
1937                                 which = 1;
1938                         else
1939                                 errx(EX_DATAERR,
1940                                         "invalid set command %s\n", *av);
1941                         av++;
1942                 }
1943                 if ( (masks[0] & masks[1]) != 0 )
1944                         errx(EX_DATAERR,
1945                             "cannot enable and disable the same set\n");
1946
1947                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1948                 if (i)
1949                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1950         } else
1951                 errx(EX_USAGE, "invalid set command %s\n", *av);
1952 }
1953
1954 void
1955 ipfw_sysctl_handler(char *av[], int which)
1956 {
1957         av++;
1958
1959         if (av[0] == NULL) {
1960                 warnx("missing keyword to enable/disable\n");
1961         } else if (_substrcmp(*av, "firewall") == 0) {
1962                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1963                     &which, sizeof(which));
1964                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1965                     &which, sizeof(which));
1966         } else if (_substrcmp(*av, "one_pass") == 0) {
1967                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1968                     &which, sizeof(which));
1969         } else if (_substrcmp(*av, "debug") == 0) {
1970                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1971                     &which, sizeof(which));
1972         } else if (_substrcmp(*av, "verbose") == 0) {
1973                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1974                     &which, sizeof(which));
1975         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1976                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1977                     &which, sizeof(which));
1978 #ifndef NO_ALTQ
1979         } else if (_substrcmp(*av, "altq") == 0) {
1980                 altq_set_enabled(which);
1981 #endif
1982         } else {
1983                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1984         }
1985 }
1986
1987 void
1988 ipfw_list(int ac, char *av[], int show_counters)
1989 {
1990         struct ip_fw *r;
1991         ipfw_dyn_rule *dynrules, *d;
1992
1993 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1994         char *lim;
1995         void *data = NULL;
1996         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1997         int exitval = EX_OK;
1998         int lac;
1999         char **lav;
2000         u_long rnum, last;
2001         char *endptr;
2002         int seen = 0;
2003         uint8_t set;
2004
2005         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
2006         int nalloc = 1024;      /* start somewhere... */
2007
2008         last = 0;
2009
2010         if (co.test_only) {
2011                 fprintf(stderr, "Testing only, list disabled\n");
2012                 return;
2013         }
2014         if (co.do_pipe) {
2015                 dummynet_list(ac, av, show_counters);
2016                 return;
2017         }
2018
2019         ac--;
2020         av++;
2021
2022         /* get rules or pipes from kernel, resizing array as necessary */
2023         nbytes = nalloc;
2024
2025         while (nbytes >= nalloc) {
2026                 nalloc = nalloc * 2 + 200;
2027                 nbytes = nalloc;
2028                 data = safe_realloc(data, nbytes);
2029                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
2030                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
2031                                 co.do_pipe ? "DUMMYNET" : "FW");
2032         }
2033
2034         /*
2035          * Count static rules. They have variable size so we
2036          * need to scan the list to count them.
2037          */
2038         for (nstat = 1, r = data, lim = (char *)data + nbytes;
2039                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
2040                     ++nstat, r = NEXT(r) )
2041                 ; /* nothing */
2042
2043         /*
2044          * Count dynamic rules. This is easier as they have
2045          * fixed size.
2046          */
2047         r = NEXT(r);
2048         dynrules = (ipfw_dyn_rule *)r ;
2049         n = (char *)r - (char *)data;
2050         ndyn = (nbytes - n) / sizeof *dynrules;
2051
2052         /* if showing stats, figure out column widths ahead of time */
2053         bcwidth = pcwidth = 0;
2054         if (show_counters) {
2055                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
2056                         /* skip rules from another set */
2057                         if (co.use_set && r->set != co.use_set - 1)
2058                                 continue;
2059
2060                         /* packet counter */
2061                         width = pr_u64(&r->pcnt, 0);
2062                         if (width > pcwidth)
2063                                 pcwidth = width;
2064
2065                         /* byte counter */
2066                         width = pr_u64(&r->bcnt, 0);
2067                         if (width > bcwidth)
2068                                 bcwidth = width;
2069                 }
2070         }
2071         if (co.do_dynamic && ndyn) {
2072                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2073                         if (co.use_set) {
2074                                 /* skip rules from another set */
2075                                 bcopy((char *)&d->rule + sizeof(uint16_t),
2076                                       &set, sizeof(uint8_t));
2077                                 if (set != co.use_set - 1)
2078                                         continue;
2079                         }
2080                         width = pr_u64(&d->pcnt, 0);
2081                         if (width > pcwidth)
2082                                 pcwidth = width;
2083
2084                         width = pr_u64(&d->bcnt, 0);
2085                         if (width > bcwidth)
2086                                 bcwidth = width;
2087                 }
2088         }
2089         /* if no rule numbers were specified, list all rules */
2090         if (ac == 0) {
2091                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
2092                         if (co.use_set && r->set != co.use_set - 1)
2093                                 continue;
2094                         show_ipfw(r, pcwidth, bcwidth);
2095                 }
2096
2097                 if (co.do_dynamic && ndyn) {
2098                         printf("## Dynamic rules (%d):\n", ndyn);
2099                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2100                                 if (co.use_set) {
2101                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2102                                               &set, sizeof(uint8_t));
2103                                         if (set != co.use_set - 1)
2104                                                 continue;
2105                                 }
2106                                 show_dyn_ipfw(d, pcwidth, bcwidth);
2107                 }
2108                 }
2109                 goto done;
2110         }
2111
2112         /* display specific rules requested on command line */
2113
2114         for (lac = ac, lav = av; lac != 0; lac--) {
2115                 /* convert command line rule # */
2116                 last = rnum = strtoul(*lav++, &endptr, 10);
2117                 if (*endptr == '-')
2118                         last = strtoul(endptr+1, &endptr, 10);
2119                 if (*endptr) {
2120                         exitval = EX_USAGE;
2121                         warnx("invalid rule number: %s", *(lav - 1));
2122                         continue;
2123                 }
2124                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
2125                         if (r->rulenum > last)
2126                                 break;
2127                         if (co.use_set && r->set != co.use_set - 1)
2128                                 continue;
2129                         if (r->rulenum >= rnum && r->rulenum <= last) {
2130                                 show_ipfw(r, pcwidth, bcwidth);
2131                                 seen = 1;
2132                         }
2133                 }
2134                 if (!seen) {
2135                         /* give precedence to other error(s) */
2136                         if (exitval == EX_OK)
2137                                 exitval = EX_UNAVAILABLE;
2138                         warnx("rule %lu does not exist", rnum);
2139                 }
2140         }
2141
2142         if (co.do_dynamic && ndyn) {
2143                 printf("## Dynamic rules:\n");
2144                 for (lac = ac, lav = av; lac != 0; lac--) {
2145                         last = rnum = strtoul(*lav++, &endptr, 10);
2146                         if (*endptr == '-')
2147                                 last = strtoul(endptr+1, &endptr, 10);
2148                         if (*endptr)
2149                                 /* already warned */
2150                                 continue;
2151                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2152                                 uint16_t rulenum;
2153
2154                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
2155                                 if (rulenum > rnum)
2156                                         break;
2157                                 if (co.use_set) {
2158                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2159                                               &set, sizeof(uint8_t));
2160                                         if (set != co.use_set - 1)
2161                                                 continue;
2162                                 }
2163                                 if (r->rulenum >= rnum && r->rulenum <= last)
2164                                         show_dyn_ipfw(d, pcwidth, bcwidth);
2165                         }
2166                 }
2167         }
2168
2169         ac = 0;
2170
2171 done:
2172         free(data);
2173
2174         if (exitval != EX_OK)
2175                 exit(exitval);
2176 #undef NEXT
2177 }
2178
2179 static int
2180 lookup_host (char *host, struct in_addr *ipaddr)
2181 {
2182         struct hostent *he;
2183
2184         if (!inet_aton(host, ipaddr)) {
2185                 if ((he = gethostbyname(host)) == NULL)
2186                         return(-1);
2187                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
2188         }
2189         return(0);
2190 }
2191
2192 /*
2193  * fills the addr and mask fields in the instruction as appropriate from av.
2194  * Update length as appropriate.
2195  * The following formats are allowed:
2196  *      me      returns O_IP_*_ME
2197  *      1.2.3.4         single IP address
2198  *      1.2.3.4:5.6.7.8 address:mask
2199  *      1.2.3.4/24      address/mask
2200  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2201  * We can have multiple comma-separated address/mask entries.
2202  */
2203 static void
2204 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen)
2205 {
2206         int len = 0;
2207         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2208         uint32_t tables_max;
2209
2210         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2211
2212         if (_substrcmp(av, "any") == 0)
2213                 return;
2214
2215         if (_substrcmp(av, "me") == 0) {
2216                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2217                 return;
2218         }
2219
2220         if (strncmp(av, "table(", 6) == 0) {
2221                 char *p = strchr(av + 6, ',');
2222
2223                 if (p)
2224                         *p++ = '\0';
2225                 cmd->o.opcode = O_IP_DST_LOOKUP;
2226                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2227                 tables_max = ipfw_get_tables_max();
2228                 if (cmd->o.arg1 > tables_max)
2229                         errx(EX_USAGE, "The table number exceeds the maximum "
2230                             "allowed value (%u)", tables_max - 1);
2231                 if (p) {
2232                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2233                         d[0] = strtoul(p, NULL, 0);
2234                 } else
2235                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2236                 return;
2237         }
2238
2239     while (av) {
2240         /*
2241          * After the address we can have '/' or ':' indicating a mask,
2242          * ',' indicating another address follows, '{' indicating a
2243          * set of addresses of unspecified size.
2244          */
2245         char *t = NULL, *p = strpbrk(av, "/:,{");
2246         int masklen;
2247         char md, nd = '\0';
2248
2249         CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len);
2250
2251         if (p) {
2252                 md = *p;
2253                 *p++ = '\0';
2254                 if ((t = strpbrk(p, ",{")) != NULL) {
2255                         nd = *t;
2256                         *t = '\0';
2257                 }
2258         } else
2259                 md = '\0';
2260
2261         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2262                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2263         switch (md) {
2264         case ':':
2265                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2266                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2267                 break;
2268         case '/':
2269                 masklen = atoi(p);
2270                 if (masklen == 0)
2271                         d[1] = htonl(0);        /* mask */
2272                 else if (masklen > 32)
2273                         errx(EX_DATAERR, "bad width ``%s''", p);
2274                 else
2275                         d[1] = htonl(~0 << (32 - masklen));
2276                 break;
2277         case '{':       /* no mask, assume /24 and put back the '{' */
2278                 d[1] = htonl(~0 << (32 - 24));
2279                 *(--p) = md;
2280                 break;
2281
2282         case ',':       /* single address plus continuation */
2283                 *(--p) = md;
2284                 /* FALLTHROUGH */
2285         case 0:         /* initialization value */
2286         default:
2287                 d[1] = htonl(~0);       /* force /32 */
2288                 break;
2289         }
2290         d[0] &= d[1];           /* mask base address with mask */
2291         if (t)
2292                 *t = nd;
2293         /* find next separator */
2294         if (p)
2295                 p = strpbrk(p, ",{");
2296         if (p && *p == '{') {
2297                 /*
2298                  * We have a set of addresses. They are stored as follows:
2299                  *   arg1       is the set size (powers of 2, 2..256)
2300                  *   addr       is the base address IN HOST FORMAT
2301                  *   mask..     is an array of arg1 bits (rounded up to
2302                  *              the next multiple of 32) with bits set
2303                  *              for each host in the map.
2304                  */
2305                 uint32_t *map = (uint32_t *)&cmd->mask;
2306                 int low, high;
2307                 int i = contigmask((uint8_t *)&(d[1]), 32);
2308
2309                 if (len > 0)
2310                         errx(EX_DATAERR, "address set cannot be in a list");
2311                 if (i < 24 || i > 31)
2312                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2313                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2314                 d[0] = ntohl(d[0]);             /* base addr in host format */
2315                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2316                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2317                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2318                         map[i] = 0;     /* clear map */
2319
2320                 av = p + 1;
2321                 low = d[0] & 0xff;
2322                 high = low + cmd->o.arg1 - 1;
2323                 /*
2324                  * Here, i stores the previous value when we specify a range
2325                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2326                  * have no previous value.
2327                  */
2328                 i = -1; /* previous value in a range */
2329                 while (isdigit(*av)) {
2330                         char *s;
2331                         int a = strtol(av, &s, 0);
2332
2333                         if (s == av) { /* no parameter */
2334                             if (*av != '}')
2335                                 errx(EX_DATAERR, "set not closed\n");
2336                             if (i != -1)
2337                                 errx(EX_DATAERR, "incomplete range %d-", i);
2338                             break;
2339                         }
2340                         if (a < low || a > high)
2341                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2342                                 a, low, high);
2343                         a -= low;
2344                         if (i == -1)    /* no previous in range */
2345                             i = a;
2346                         else {          /* check that range is valid */
2347                             if (i > a)
2348                                 errx(EX_DATAERR, "invalid range %d-%d",
2349                                         i+low, a+low);
2350                             if (*s == '-')
2351                                 errx(EX_DATAERR, "double '-' in range");
2352                         }
2353                         for (; i <= a; i++)
2354                             map[i/32] |= 1<<(i & 31);
2355                         i = -1;
2356                         if (*s == '-')
2357                             i = a;
2358                         else if (*s == '}')
2359                             break;
2360                         av = s+1;
2361                 }
2362                 return;
2363         }
2364         av = p;
2365         if (av)                 /* then *av must be a ',' */
2366                 av++;
2367
2368         /* Check this entry */
2369         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2370                 /*
2371                  * 'any' turns the entire list into a NOP.
2372                  * 'not any' never matches, so it is removed from the
2373                  * list unless it is the only item, in which case we
2374                  * report an error.
2375                  */
2376                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2377                         if (av == NULL && len == 0) /* only this entry */
2378                                 errx(EX_DATAERR, "not any never matches");
2379                 }
2380                 /* else do nothing and skip this entry */
2381                 return;
2382         }
2383         /* A single IP can be stored in an optimized format */
2384         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2385                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2386                 return;
2387         }
2388         len += 2;       /* two words... */
2389         d += 2;
2390     } /* end while */
2391     if (len + 1 > F_LEN_MASK)
2392         errx(EX_DATAERR, "address list too long");
2393     cmd->o.len |= len+1;
2394 }
2395
2396
2397 /* n2mask sets n bits of the mask */
2398 void
2399 n2mask(struct in6_addr *mask, int n)
2400 {
2401         static int      minimask[9] =
2402             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2403         u_char          *p;
2404
2405         memset(mask, 0, sizeof(struct in6_addr));
2406         p = (u_char *) mask;
2407         for (; n > 0; p++, n -= 8) {
2408                 if (n >= 8)
2409                         *p = 0xff;
2410                 else
2411                         *p = minimask[n];
2412         }
2413         return;
2414 }
2415
2416 /*
2417  * helper function to process a set of flags and set bits in the
2418  * appropriate masks.
2419  */
2420 static void
2421 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2422         struct _s_x *flags, char *p)
2423 {
2424         uint8_t set=0, clear=0;
2425
2426         while (p && *p) {
2427                 char *q;        /* points to the separator */
2428                 int val;
2429                 uint8_t *which; /* mask we are working on */
2430
2431                 if (*p == '!') {
2432                         p++;
2433                         which = &clear;
2434                 } else
2435                         which = &set;
2436                 q = strchr(p, ',');
2437                 if (q)
2438                         *q++ = '\0';
2439                 val = match_token(flags, p);
2440                 if (val <= 0)
2441                         errx(EX_DATAERR, "invalid flag %s", p);
2442                 *which |= (uint8_t)val;
2443                 p = q;
2444         }
2445         cmd->opcode = opcode;
2446         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2447         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2448 }
2449
2450
2451 void
2452 ipfw_delete(char *av[])
2453 {
2454         uint32_t rulenum;
2455         int i;
2456         int exitval = EX_OK;
2457         int do_set = 0;
2458
2459         av++;
2460         NEED1("missing rule specification");
2461         if ( *av && _substrcmp(*av, "set") == 0) {
2462                 /* Do not allow using the following syntax:
2463                  *      ipfw set N delete set M
2464                  */
2465                 if (co.use_set)
2466                         errx(EX_DATAERR, "invalid syntax");
2467                 do_set = 1;     /* delete set */
2468                 av++;
2469         }
2470
2471         /* Rule number */
2472         while (*av && isdigit(**av)) {
2473                 i = atoi(*av); av++;
2474                 if (co.do_nat) {
2475                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2476                         if (exitval) {
2477                                 exitval = EX_UNAVAILABLE;
2478                                 warn("rule %u not available", i);
2479                         }
2480                 } else if (co.do_pipe) {
2481                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2482                 } else {
2483                         if (co.use_set)
2484                                 rulenum = (i & 0xffff) | (5 << 24) |
2485                                     ((co.use_set - 1) << 16);
2486                         else
2487                         rulenum =  (i & 0xffff) | (do_set << 24);
2488                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2489                         if (i) {
2490                                 exitval = EX_UNAVAILABLE;
2491                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2492                                     rulenum);
2493                         }
2494                 }
2495         }
2496         if (exitval != EX_OK)
2497                 exit(exitval);
2498 }
2499
2500
2501 /*
2502  * fill the interface structure. We do not check the name as we can
2503  * create interfaces dynamically, so checking them at insert time
2504  * makes relatively little sense.
2505  * Interface names containing '*', '?', or '[' are assumed to be shell
2506  * patterns which match interfaces.
2507  */
2508 static void
2509 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen)
2510 {
2511         cmd->name[0] = '\0';
2512         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2513
2514         CHECK_CMDLEN;
2515
2516         /* Parse the interface or address */
2517         if (strcmp(arg, "any") == 0)
2518                 cmd->o.len = 0;         /* effectively ignore this command */
2519         else if (strncmp(arg, "table(", 6) == 0) {
2520                 char *p = strchr(arg + 6, ',');
2521                 if (p)
2522                         *p++ = '\0';
2523                 cmd->name[0] = '\1'; /* Special value indicating table */
2524                 cmd->p.glob = strtoul(arg + 6, NULL, 0);
2525         } else if (!isdigit(*arg)) {
2526                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2527                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2528         } else if (!inet_aton(arg, &cmd->p.ip))
2529                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2530 }
2531
2532 static void
2533 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2534 {
2535         int i;
2536         size_t l;
2537         char *ap, *ptr, *optr;
2538         struct ether_addr *mac;
2539         const char *macset = "0123456789abcdefABCDEF:";
2540
2541         if (strcmp(p, "any") == 0) {
2542                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2543                         addr[i] = mask[i] = 0;
2544                 return;
2545         }
2546
2547         optr = ptr = strdup(p);
2548         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2549                 l = strlen(ap);
2550                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2551                         errx(EX_DATAERR, "Incorrect MAC address");
2552                 bcopy(mac, addr, ETHER_ADDR_LEN);
2553         } else
2554                 errx(EX_DATAERR, "Incorrect MAC address");
2555
2556         if (ptr != NULL) { /* we have mask? */
2557                 if (p[ptr - optr - 1] == '/') { /* mask len */
2558                         long ml = strtol(ptr, &ap, 10);
2559                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2560                                 errx(EX_DATAERR, "Incorrect mask length");
2561                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2562                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2563                 } else { /* mask */
2564                         l = strlen(ptr);
2565                         if (strspn(ptr, macset) != l ||
2566                             (mac = ether_aton(ptr)) == NULL)
2567                                 errx(EX_DATAERR, "Incorrect mask");
2568                         bcopy(mac, mask, ETHER_ADDR_LEN);
2569                 }
2570         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2571                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2572                         mask[i] = 0xff;
2573         }
2574         for (i = 0; i < ETHER_ADDR_LEN; i++)
2575                 addr[i] &= mask[i];
2576
2577         free(optr);
2578 }
2579
2580 /*
2581  * helper function, updates the pointer to cmd with the length
2582  * of the current command, and also cleans up the first word of
2583  * the new command in case it has been clobbered before.
2584  */
2585 static ipfw_insn *
2586 next_cmd(ipfw_insn *cmd, int *len)
2587 {
2588         *len -= F_LEN(cmd);
2589         CHECK_LENGTH(*len, 0);
2590         cmd += F_LEN(cmd);
2591         bzero(cmd, sizeof(*cmd));
2592         return cmd;
2593 }
2594
2595 /*
2596  * Takes arguments and copies them into a comment
2597  */
2598 static void
2599 fill_comment(ipfw_insn *cmd, char **av, int cblen)
2600 {
2601         int i, l;
2602         char *p = (char *)(cmd + 1);
2603
2604         cmd->opcode = O_NOP;
2605         cmd->len =  (cmd->len & (F_NOT | F_OR));
2606
2607         /* Compute length of comment string. */
2608         for (i = 0, l = 0; av[i] != NULL; i++)
2609                 l += strlen(av[i]) + 1;
2610         if (l == 0)
2611                 return;
2612         if (l > 84)
2613                 errx(EX_DATAERR,
2614                     "comment too long (max 80 chars)");
2615         l = 1 + (l+3)/4;
2616         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2617         CHECK_CMDLEN;
2618
2619         for (i = 0; av[i] != NULL; i++) {
2620                 strcpy(p, av[i]);
2621                 p += strlen(av[i]);
2622                 *p++ = ' ';
2623         }
2624         *(--p) = '\0';
2625 }
2626
2627 /*
2628  * A function to fill simple commands of size 1.
2629  * Existing flags are preserved.
2630  */
2631 static void
2632 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2633 {
2634         cmd->opcode = opcode;
2635         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2636         cmd->arg1 = arg;
2637 }
2638
2639 /*
2640  * Fetch and add the MAC address and type, with masks. This generates one or
2641  * two microinstructions, and returns the pointer to the last one.
2642  */
2643 static ipfw_insn *
2644 add_mac(ipfw_insn *cmd, char *av[], int cblen)
2645 {
2646         ipfw_insn_mac *mac;
2647
2648         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2649                 errx(EX_DATAERR, "MAC dst src");
2650
2651         cmd->opcode = O_MACADDR2;
2652         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2653         CHECK_CMDLEN;
2654
2655         mac = (ipfw_insn_mac *)cmd;
2656         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2657         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2658             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2659         return cmd;
2660 }
2661
2662 static ipfw_insn *
2663 add_mactype(ipfw_insn *cmd, char *av, int cblen)
2664 {
2665         if (!av)
2666                 errx(EX_DATAERR, "missing MAC type");
2667         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2668                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE,
2669                     cblen);
2670                 cmd->opcode = O_MAC_TYPE;
2671                 return cmd;
2672         } else
2673                 return NULL;
2674 }
2675
2676 static ipfw_insn *
2677 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2678 {
2679         struct protoent *pe;
2680         char *ep;
2681         int proto;
2682
2683         proto = strtol(av, &ep, 10);
2684         if (*ep != '\0' || proto <= 0) {
2685                 if ((pe = getprotobyname(av)) == NULL)
2686                         return NULL;
2687                 proto = pe->p_proto;
2688         }
2689
2690         fill_cmd(cmd, O_PROTO, 0, proto);
2691         *protop = proto;
2692         return cmd;
2693 }
2694
2695 static ipfw_insn *
2696 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2697 {
2698         u_char proto = IPPROTO_IP;
2699
2700         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2701                 ; /* do not set O_IP4 nor O_IP6 */
2702         else if (strcmp(av, "ip4") == 0)
2703                 /* explicit "just IPv4" rule */
2704                 fill_cmd(cmd, O_IP4, 0, 0);
2705         else if (strcmp(av, "ip6") == 0) {
2706                 /* explicit "just IPv6" rule */
2707                 proto = IPPROTO_IPV6;
2708                 fill_cmd(cmd, O_IP6, 0, 0);
2709         } else
2710                 return add_proto0(cmd, av, protop);
2711
2712         *protop = proto;
2713         return cmd;
2714 }
2715
2716 static ipfw_insn *
2717 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2718 {
2719         u_char proto = IPPROTO_IP;
2720
2721         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2722                 ; /* do not set O_IP4 nor O_IP6 */
2723         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2724                 /* explicit "just IPv4" rule */
2725                 fill_cmd(cmd, O_IP4, 0, 0);
2726         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2727                 /* explicit "just IPv6" rule */
2728                 proto = IPPROTO_IPV6;
2729                 fill_cmd(cmd, O_IP6, 0, 0);
2730         } else
2731                 return add_proto0(cmd, av, protop);
2732
2733         *protop = proto;
2734         return cmd;
2735 }
2736
2737 static ipfw_insn *
2738 add_srcip(ipfw_insn *cmd, char *av, int cblen)
2739 {
2740         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2741         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2742                 cmd->opcode = O_IP_SRC_SET;
2743         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2744                 cmd->opcode = O_IP_SRC_LOOKUP;
2745         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2746                 cmd->opcode = O_IP_SRC_ME;
2747         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2748                 cmd->opcode = O_IP_SRC;
2749         else                                                    /* addr/mask */
2750                 cmd->opcode = O_IP_SRC_MASK;
2751         return cmd;
2752 }
2753
2754 static ipfw_insn *
2755 add_dstip(ipfw_insn *cmd, char *av, int cblen)
2756 {
2757         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2758         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2759                 ;
2760         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2761                 ;
2762         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2763                 cmd->opcode = O_IP_DST_ME;
2764         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2765                 cmd->opcode = O_IP_DST;
2766         else                                                    /* addr/mask */
2767                 cmd->opcode = O_IP_DST_MASK;
2768         return cmd;
2769 }
2770
2771 static ipfw_insn *
2772 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
2773 {
2774         /* XXX "any" is trapped before. Perhaps "to" */
2775         if (_substrcmp(av, "any") == 0) {
2776                 return NULL;
2777         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
2778                 /* XXX todo: check that we have a protocol with ports */
2779                 cmd->opcode = opcode;
2780                 return cmd;
2781         }
2782         return NULL;
2783 }
2784
2785 static ipfw_insn *
2786 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2787 {
2788         struct in6_addr a;
2789         char *host, *ch, buf[INET6_ADDRSTRLEN];
2790         ipfw_insn *ret = NULL;
2791         int len;
2792
2793         /* Copy first address in set if needed */
2794         if ((ch = strpbrk(av, "/,")) != NULL) {
2795                 len = ch - av;
2796                 strlcpy(buf, av, sizeof(buf));
2797                 if (len < sizeof(buf))
2798                         buf[len] = '\0';
2799                 host = buf;
2800         } else
2801                 host = av;
2802
2803         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2804             inet_pton(AF_INET6, host, &a) == 1)
2805                 ret = add_srcip6(cmd, av, cblen);
2806         /* XXX: should check for IPv4, not !IPv6 */
2807         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2808             inet_pton(AF_INET6, host, &a) != 1))
2809                 ret = add_srcip(cmd, av, cblen);
2810         if (ret == NULL && strcmp(av, "any") != 0)
2811                 ret = cmd;
2812
2813         return ret;
2814 }
2815
2816 static ipfw_insn *
2817 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2818 {
2819         struct in6_addr a;
2820         char *host, *ch, buf[INET6_ADDRSTRLEN];
2821         ipfw_insn *ret = NULL;
2822         int len;
2823
2824         /* Copy first address in set if needed */
2825         if ((ch = strpbrk(av, "/,")) != NULL) {
2826                 len = ch - av;
2827                 strlcpy(buf, av, sizeof(buf));
2828                 if (len < sizeof(buf))
2829                         buf[len] = '\0';
2830                 host = buf;
2831         } else
2832                 host = av;
2833
2834         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2835             inet_pton(AF_INET6, host, &a) == 1)
2836                 ret = add_dstip6(cmd, av, cblen);
2837         /* XXX: should check for IPv4, not !IPv6 */
2838         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2839             inet_pton(AF_INET6, host, &a) != 1))
2840                 ret = add_dstip(cmd, av, cblen);
2841         if (ret == NULL && strcmp(av, "any") != 0)
2842                 ret = cmd;
2843
2844         return ret;
2845 }
2846
2847 /*
2848  * Parse arguments and assemble the microinstructions which make up a rule.
2849  * Rules are added into the 'rulebuf' and then copied in the correct order
2850  * into the actual rule.
2851  *
2852  * The syntax for a rule starts with the action, followed by
2853  * optional action parameters, and the various match patterns.
2854  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2855  * (generated if the rule includes a keep-state option), then the
2856  * various match patterns, log/altq actions, and the actual action.
2857  *
2858  */
2859 void
2860 ipfw_add(char *av[])
2861 {
2862         /*
2863          * rules are added into the 'rulebuf' and then copied in
2864          * the correct order into the actual rule.
2865          * Some things that need to go out of order (prob, action etc.)
2866          * go into actbuf[].
2867          */
2868         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2869         int rblen, ablen, cblen;
2870
2871         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2872         ipfw_insn *first_cmd;   /* first match pattern */
2873
2874         struct ip_fw *rule;
2875
2876         /*
2877          * various flags used to record that we entered some fields.
2878          */
2879         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2880         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2881         size_t len;
2882
2883         int i;
2884
2885         int open_par = 0;       /* open parenthesis ( */
2886
2887         /* proto is here because it is used to fetch ports */
2888         u_char proto = IPPROTO_IP;      /* default protocol */
2889
2890         double match_prob = 1; /* match probability, default is always match */
2891
2892         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2893         bzero(cmdbuf, sizeof(cmdbuf));
2894         bzero(rulebuf, sizeof(rulebuf));
2895
2896         rule = (struct ip_fw *)rulebuf;
2897         cmd = (ipfw_insn *)cmdbuf;
2898         action = (ipfw_insn *)actbuf;
2899
2900         rblen = sizeof(rulebuf) / sizeof(rulebuf[0]);
2901         rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]);
2902         ablen = sizeof(actbuf) / sizeof(actbuf[0]);
2903         cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]);
2904         cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1;
2905
2906 #define CHECK_RBUFLEN(len)      { CHECK_LENGTH(rblen, len); rblen -= len; }
2907 #define CHECK_ACTLEN            CHECK_LENGTH(ablen, action->len)
2908
2909         av++;
2910
2911         /* [rule N]     -- Rule number optional */
2912         if (av[0] && isdigit(**av)) {
2913                 rule->rulenum = atoi(*av);
2914                 av++;
2915         }
2916
2917         /* [set N]      -- set number (0..RESVD_SET), optional */
2918         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2919                 int set = strtoul(av[1], NULL, 10);
2920                 if (set < 0 || set > RESVD_SET)
2921                         errx(EX_DATAERR, "illegal set %s", av[1]);
2922                 rule->set = set;
2923                 av += 2;
2924         }
2925
2926         /* [prob D]     -- match probability, optional */
2927         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2928                 match_prob = strtod(av[1], NULL);
2929
2930                 if (match_prob <= 0 || match_prob > 1)
2931                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2932                 av += 2;
2933         }
2934
2935         /* action       -- mandatory */
2936         NEED1("missing action");
2937         i = match_token(rule_actions, *av);
2938         av++;
2939         action->len = 1;        /* default */
2940         CHECK_ACTLEN;
2941         switch(i) {
2942         case TOK_CHECKSTATE:
2943                 have_state = action;
2944                 action->opcode = O_CHECK_STATE;
2945                 break;
2946
2947         case TOK_ACCEPT:
2948                 action->opcode = O_ACCEPT;
2949                 break;
2950
2951         case TOK_DENY:
2952                 action->opcode = O_DENY;
2953                 action->arg1 = 0;
2954                 break;
2955
2956         case TOK_REJECT:
2957                 action->opcode = O_REJECT;
2958                 action->arg1 = ICMP_UNREACH_HOST;
2959                 break;
2960
2961         case TOK_RESET:
2962                 action->opcode = O_REJECT;
2963                 action->arg1 = ICMP_REJECT_RST;
2964                 break;
2965
2966         case TOK_RESET6:
2967                 action->opcode = O_UNREACH6;
2968                 action->arg1 = ICMP6_UNREACH_RST;
2969                 break;
2970
2971         case TOK_UNREACH:
2972                 action->opcode = O_REJECT;
2973                 NEED1("missing reject code");
2974                 fill_reject_code(&action->arg1, *av);
2975                 av++;
2976                 break;
2977
2978         case TOK_UNREACH6:
2979                 action->opcode = O_UNREACH6;
2980                 NEED1("missing unreach code");
2981                 fill_unreach6_code(&action->arg1, *av);
2982                 av++;
2983                 break;
2984
2985         case TOK_COUNT:
2986                 action->opcode = O_COUNT;
2987                 break;
2988
2989         case TOK_NAT:
2990                 action->opcode = O_NAT;
2991                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2992                 CHECK_ACTLEN;
2993                 if (_substrcmp(*av, "global") == 0) {
2994                         action->arg1 = 0;
2995                         av++;
2996                         break;
2997                 } else
2998                         goto chkarg;
2999
3000         case TOK_QUEUE:
3001                 action->opcode = O_QUEUE;
3002                 goto chkarg;
3003         case TOK_PIPE:
3004                 action->opcode = O_PIPE;
3005                 goto chkarg;
3006         case TOK_SKIPTO:
3007                 action->opcode = O_SKIPTO;
3008                 goto chkarg;
3009         case TOK_NETGRAPH:
3010                 action->opcode = O_NETGRAPH;
3011                 goto chkarg;
3012         case TOK_NGTEE:
3013                 action->opcode = O_NGTEE;
3014                 goto chkarg;
3015         case TOK_DIVERT:
3016                 action->opcode = O_DIVERT;
3017                 goto chkarg;
3018         case TOK_TEE:
3019                 action->opcode = O_TEE;
3020                 goto chkarg;
3021         case TOK_CALL:
3022                 action->opcode = O_CALLRETURN;
3023 chkarg:
3024                 if (!av[0])
3025                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
3026                 if (isdigit(**av)) {
3027                         action->arg1 = strtoul(*av, NULL, 10);
3028                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
3029                                 errx(EX_DATAERR, "illegal argument for %s",
3030                                     *(av - 1));
3031                 } else if (_substrcmp(*av, "tablearg") == 0) {
3032                         action->arg1 = IP_FW_TABLEARG;
3033                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
3034                         struct servent *s;
3035                         setservent(1);
3036                         s = getservbyname(av[0], "divert");
3037                         if (s != NULL)
3038                                 action->arg1 = ntohs(s->s_port);
3039                         else
3040                                 errx(EX_DATAERR, "illegal divert/tee port");
3041                 } else
3042                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
3043                 av++;
3044                 break;
3045
3046         case TOK_FORWARD: {
3047                 /*
3048                  * Locate the address-port separator (':' or ',').
3049                  * Could be one of the following:
3050                  *      hostname:port
3051                  *      IPv4 a.b.c.d,port
3052                  *      IPv4 a.b.c.d:port
3053                  *      IPv6 w:x:y::z,port
3054                  * The ':' can only be used with hostname and IPv4 address.
3055                  * XXX-BZ Should we also support [w:x:y::z]:port?
3056                  */
3057                 struct sockaddr_storage result;
3058                 struct addrinfo *res;
3059                 char *s, *end;
3060                 int family;
3061                 u_short port_number;
3062
3063                 NEED1("missing forward address[:port]");
3064
3065                 /*
3066                  * locate the address-port separator (':' or ',')
3067                  */
3068                 s = strchr(*av, ',');
3069                 if (s == NULL) {
3070                         /* Distinguish between IPv4:port and IPv6 cases. */
3071                         s = strchr(*av, ':');
3072                         if (s && strchr(s+1, ':'))
3073                                 s = NULL; /* no port */
3074                 }
3075
3076                 port_number = 0;
3077                 if (s != NULL) {
3078                         /* Terminate host portion and set s to start of port. */
3079                         *(s++) = '\0';
3080                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
3081                         if (s == end)
3082                                 errx(EX_DATAERR,
3083                                     "illegal forwarding port ``%s''", s);
3084                         port_number = (u_short)i;
3085                 }
3086
3087                 if (_substrcmp(*av, "tablearg") == 0) {
3088                         family = PF_INET;
3089                         ((struct sockaddr_in*)&result)->sin_addr.s_addr =
3090                             INADDR_ANY;
3091                 } else {
3092                         /*
3093                          * Resolve the host name or address to a family and a
3094                          * network representation of the address.
3095                          */
3096                         if (getaddrinfo(*av, NULL, NULL, &res))
3097                                 errx(EX_DATAERR, NULL);
3098                         /* Just use the first host in the answer. */
3099                         family = res->ai_family;
3100                         memcpy(&result, res->ai_addr, res->ai_addrlen);
3101                         freeaddrinfo(res);
3102                 }
3103
3104                 if (family == PF_INET) {
3105                         ipfw_insn_sa *p = (ipfw_insn_sa *)action;
3106
3107                         action->opcode = O_FORWARD_IP;
3108                         action->len = F_INSN_SIZE(ipfw_insn_sa);
3109                         CHECK_ACTLEN;
3110
3111                         /*
3112                          * In the kernel we assume AF_INET and use only
3113                          * sin_port and sin_addr. Remember to set sin_len as
3114                          * the routing code seems to use it too.
3115                          */
3116                         p->sa.sin_len = sizeof(struct sockaddr_in);
3117                         p->sa.sin_family = AF_INET;
3118                         p->sa.sin_port = port_number;
3119                         p->sa.sin_addr.s_addr =
3120                              ((struct sockaddr_in *)&result)->sin_addr.s_addr;
3121                 } else if (family == PF_INET6) {
3122                         ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
3123
3124                         action->opcode = O_FORWARD_IP6;
3125                         action->len = F_INSN_SIZE(ipfw_insn_sa6);
3126                         CHECK_ACTLEN;
3127
3128                         p->sa.sin6_len = sizeof(struct sockaddr_in6);
3129                         p->sa.sin6_family = AF_INET6;
3130                         p->sa.sin6_port = port_number;
3131                         p->sa.sin6_flowinfo = 0;
3132                         p->sa.sin6_scope_id = 0;
3133                         /* No table support for v6 yet. */
3134                         bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
3135                             &p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
3136                 } else {
3137                         errx(EX_DATAERR, "Invalid address family in forward action");
3138                 }
3139                 av++;
3140                 break;
3141             }
3142         case TOK_COMMENT:
3143                 /* pretend it is a 'count' rule followed by the comment */
3144                 action->opcode = O_COUNT;
3145                 av--;           /* go back... */
3146                 break;
3147
3148         case TOK_SETFIB:
3149             {
3150                 int numfibs;
3151                 size_t intsize = sizeof(int);
3152
3153                 action->opcode = O_SETFIB;
3154                 NEED1("missing fib number");
3155                 if (_substrcmp(*av, "tablearg") == 0) {
3156                         action->arg1 = IP_FW_TABLEARG;
3157                 } else {
3158                         action->arg1 = strtoul(*av, NULL, 10);
3159                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
3160                             NULL, 0) == -1)
3161                                 errx(EX_DATAERR, "fibs not suported.\n");
3162                         if (action->arg1 >= numfibs)  /* Temporary */
3163                                 errx(EX_DATAERR, "fib too large.\n");
3164                 }
3165                 av++;
3166                 break;
3167             }
3168
3169         case TOK_SETDSCP:
3170             {
3171                 int code;
3172
3173                 action->opcode = O_SETDSCP;
3174                 NEED1("missing DSCP code");
3175                 if (_substrcmp(*av, "tablearg") == 0) {
3176                         action->arg1 = IP_FW_TABLEARG;
3177                 } else if (isalpha(*av[0])) {
3178                         if ((code = match_token(f_ipdscp, *av)) == -1)
3179                                 errx(EX_DATAERR, "Unknown DSCP code");
3180                         action->arg1 = code;
3181                 } else
3182                         action->arg1 = strtoul(*av, NULL, 10);
3183                 av++;
3184                 break;
3185             }
3186
3187         case TOK_REASS:
3188                 action->opcode = O_REASS;
3189                 break;
3190
3191         case TOK_RETURN:
3192                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
3193                 break;
3194
3195         default:
3196                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
3197         }
3198         action = next_cmd(action, &ablen);
3199
3200         /*
3201          * [altq queuename] -- altq tag, optional
3202          * [log [logamount N]]  -- log, optional
3203          *
3204          * If they exist, it go first in the cmdbuf, but then it is
3205          * skipped in the copy section to the end of the buffer.
3206          */
3207         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
3208                 av++;
3209                 switch (i) {
3210                 case TOK_LOG:
3211                     {
3212                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
3213                         int l;
3214
3215                         if (have_log)
3216                                 errx(EX_DATAERR,
3217                                     "log cannot be specified more than once");
3218                         have_log = (ipfw_insn *)c;
3219                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
3220                         CHECK_CMDLEN;
3221                         cmd->opcode = O_LOG;
3222                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
3223                                 av++;
3224                                 NEED1("logamount requires argument");
3225                                 l = atoi(*av);
3226                                 if (l < 0)
3227                                         errx(EX_DATAERR,
3228                                             "logamount must be positive");
3229                                 c->max_log = l;
3230                                 av++;
3231                         } else {
3232                                 len = sizeof(c->max_log);
3233                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
3234                                     &c->max_log, &len, NULL, 0) == -1) {
3235                                         if (co.test_only) {
3236                                                 c->max_log = 0;
3237                                                 break;
3238                                         }
3239                                         errx(1, "sysctlbyname(\"%s\")",
3240                                             "net.inet.ip.fw.verbose_limit");
3241                                 }
3242                         }
3243                     }
3244                         break;
3245
3246 #ifndef NO_ALTQ
3247                 case TOK_ALTQ:
3248                     {
3249                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
3250
3251                         NEED1("missing altq queue name");
3252                         if (have_altq)
3253                                 errx(EX_DATAERR,
3254                                     "altq cannot be specified more than once");
3255                         have_altq = (ipfw_insn *)a;
3256                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
3257                         CHECK_CMDLEN;
3258                         cmd->opcode = O_ALTQ;
3259                         a->qid = altq_name_to_qid(*av);
3260                         av++;
3261                     }
3262                         break;
3263 #endif
3264
3265                 case TOK_TAG:
3266                 case TOK_UNTAG: {
3267                         uint16_t tag;
3268
3269                         if (have_tag)
3270                                 errx(EX_USAGE, "tag and untag cannot be "
3271                                     "specified more than once");
3272                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
3273                            rule_action_params);
3274                         have_tag = cmd;
3275                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
3276                         av++;
3277                         break;
3278                 }
3279
3280                 default:
3281                         abort();
3282                 }
3283                 cmd = next_cmd(cmd, &cblen);
3284         }
3285
3286         if (have_state) /* must be a check-state, we are done */
3287                 goto done;
3288
3289 #define OR_START(target)                                        \
3290         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
3291                 if (open_par)                                   \
3292                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
3293                 prev = NULL;                                    \
3294                 open_par = 1;                                   \
3295                 if ( (av[0])[1] == '\0') {                      \
3296                         av++;                                   \
3297                 } else                                          \
3298                         (*av)++;                                \
3299         }                                                       \
3300         target:                                                 \
3301
3302
3303 #define CLOSE_PAR                                               \
3304         if (open_par) {                                         \
3305                 if (av[0] && (                                  \
3306                     strcmp(*av, ")") == 0 ||                    \
3307                     strcmp(*av, "}") == 0)) {                   \
3308                         prev = NULL;                            \
3309                         open_par = 0;                           \
3310                         av++;                                   \
3311                 } else                                          \
3312                         errx(EX_USAGE, "missing \")\"\n");      \
3313         }
3314
3315 #define NOT_BLOCK                                               \
3316         if (av[0] && _substrcmp(*av, "not") == 0) {             \
3317                 if (cmd->len & F_NOT)                           \
3318                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3319                 cmd->len |= F_NOT;                              \
3320                 av++;                                           \
3321         }
3322
3323 #define OR_BLOCK(target)                                        \
3324         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3325                 if (prev == NULL || open_par == 0)              \
3326                         errx(EX_DATAERR, "invalid OR block");   \
3327                 prev->len |= F_OR;                              \
3328                 av++;                                   \
3329                 goto target;                                    \
3330         }                                                       \
3331         CLOSE_PAR;
3332
3333         first_cmd = cmd;
3334
3335 #if 0
3336         /*
3337          * MAC addresses, optional.
3338          * If we have this, we skip the part "proto from src to dst"
3339          * and jump straight to the option parsing.
3340          */
3341         NOT_BLOCK;
3342         NEED1("missing protocol");
3343         if (_substrcmp(*av, "MAC") == 0 ||
3344             _substrcmp(*av, "mac") == 0) {
3345                 av++;                   /* the "MAC" keyword */
3346                 add_mac(cmd, av);       /* exits in case of errors */
3347                 cmd = next_cmd(cmd);
3348                 av += 2;                /* dst-mac and src-mac */
3349                 NOT_BLOCK;
3350                 NEED1("missing mac type");
3351                 if (add_mactype(cmd, av[0]))
3352                         cmd = next_cmd(cmd);
3353                 av++;                   /* any or mac-type */
3354                 goto read_options;
3355         }
3356 #endif
3357
3358         /*
3359          * protocol, mandatory
3360          */
3361     OR_START(get_proto);
3362         NOT_BLOCK;
3363         NEED1("missing protocol");
3364         if (add_proto_compat(cmd, *av, &proto)) {
3365                 av++;
3366                 if (F_LEN(cmd) != 0) {
3367                         prev = cmd;
3368                         cmd = next_cmd(cmd, &cblen);
3369                 }
3370         } else if (first_cmd != cmd) {
3371                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3372         } else
3373                 goto read_options;
3374     OR_BLOCK(get_proto);
3375
3376         /*
3377          * "from", mandatory
3378          */
3379         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3380                 errx(EX_USAGE, "missing ``from''");
3381         av++;
3382
3383         /*
3384          * source IP, mandatory
3385          */
3386     OR_START(source_ip);
3387         NOT_BLOCK;      /* optional "not" */
3388         NEED1("missing source address");
3389         if (add_src(cmd, *av, proto, cblen)) {
3390                 av++;
3391                 if (F_LEN(cmd) != 0) {  /* ! any */
3392                         prev = cmd;
3393                         cmd = next_cmd(cmd, &cblen);
3394                 }
3395         } else
3396                 errx(EX_USAGE, "bad source address %s", *av);
3397     OR_BLOCK(source_ip);
3398
3399         /*
3400          * source ports, optional
3401          */
3402         NOT_BLOCK;      /* optional "not" */
3403         if ( av[0] != NULL ) {
3404                 if (_substrcmp(*av, "any") == 0 ||
3405                     add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3406                         av++;
3407                         if (F_LEN(cmd) != 0)
3408                                 cmd = next_cmd(cmd, &cblen);
3409                 }
3410         }
3411
3412         /*
3413          * "to", mandatory
3414          */
3415         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3416                 errx(EX_USAGE, "missing ``to''");
3417         av++;
3418
3419         /*
3420          * destination, mandatory
3421          */
3422     OR_START(dest_ip);
3423         NOT_BLOCK;      /* optional "not" */
3424         NEED1("missing dst address");
3425         if (add_dst(cmd, *av, proto, cblen)) {
3426                 av++;
3427                 if (F_LEN(cmd) != 0) {  /* ! any */
3428                         prev = cmd;
3429                         cmd = next_cmd(cmd, &cblen);
3430                 }
3431         } else
3432                 errx( EX_USAGE, "bad destination address %s", *av);
3433     OR_BLOCK(dest_ip);
3434
3435         /*
3436          * dest. ports, optional
3437          */
3438         NOT_BLOCK;      /* optional "not" */
3439         if (av[0]) {
3440                 if (_substrcmp(*av, "any") == 0 ||
3441                     add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3442                         av++;
3443                         if (F_LEN(cmd) != 0)
3444                                 cmd = next_cmd(cmd, &cblen);
3445                 }
3446         }
3447
3448 read_options:
3449         if (av[0] && first_cmd == cmd) {
3450                 /*
3451                  * nothing specified so far, store in the rule to ease
3452                  * printout later.
3453                  */
3454                  rule->_pad = 1;
3455         }
3456         prev = NULL;
3457         while ( av[0] != NULL ) {
3458                 char *s;
3459                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3460
3461                 s = *av;
3462                 cmd32 = (ipfw_insn_u32 *)cmd;
3463
3464                 if (*s == '!') {        /* alternate syntax for NOT */
3465                         if (cmd->len & F_NOT)
3466                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3467                         cmd->len = F_NOT;
3468                         s++;
3469                 }
3470                 i = match_token(rule_options, s);
3471                 av++;
3472                 switch(i) {
3473                 case TOK_NOT:
3474                         if (cmd->len & F_NOT)
3475                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3476                         cmd->len = F_NOT;
3477                         break;
3478
3479                 case TOK_OR:
3480                         if (open_par == 0 || prev == NULL)
3481                                 errx(EX_USAGE, "invalid \"or\" block\n");
3482                         prev->len |= F_OR;
3483                         break;
3484
3485                 case TOK_STARTBRACE:
3486                         if (open_par)
3487                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3488                         open_par = 1;
3489                         break;
3490
3491                 case TOK_ENDBRACE:
3492                         if (!open_par)
3493                                 errx(EX_USAGE, "+missing \")\"\n");
3494                         open_par = 0;
3495                         prev = NULL;
3496                         break;
3497
3498                 case TOK_IN:
3499                         fill_cmd(cmd, O_IN, 0, 0);
3500                         break;
3501
3502                 case TOK_OUT:
3503                         cmd->len ^= F_NOT; /* toggle F_NOT */
3504                         fill_cmd(cmd, O_IN, 0, 0);
3505                         break;
3506
3507                 case TOK_DIVERTED:
3508                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3509                         break;
3510
3511                 case TOK_DIVERTEDLOOPBACK:
3512                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3513                         break;
3514
3515                 case TOK_DIVERTEDOUTPUT:
3516                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3517                         break;
3518
3519                 case TOK_FRAG:
3520                         fill_cmd(cmd, O_FRAG, 0, 0);
3521                         break;
3522
3523                 case TOK_LAYER2:
3524                         fill_cmd(cmd, O_LAYER2, 0, 0);
3525                         break;
3526
3527                 case TOK_XMIT:
3528                 case TOK_RECV:
3529                 case TOK_VIA:
3530                         NEED1("recv, xmit, via require interface name"
3531                                 " or address");
3532                         fill_iface((ipfw_insn_if *)cmd, av[0], cblen);
3533                         av++;
3534                         if (F_LEN(cmd) == 0)    /* not a valid address */
3535                                 break;
3536                         if (i == TOK_XMIT)
3537                                 cmd->opcode = O_XMIT;
3538                         else if (i == TOK_RECV)
3539                                 cmd->opcode = O_RECV;
3540                         else if (i == TOK_VIA)
3541                                 cmd->opcode = O_VIA;
3542                         break;
3543
3544                 case TOK_ICMPTYPES:
3545                         NEED1("icmptypes requires list of types");
3546                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3547                         av++;
3548                         break;
3549
3550                 case TOK_ICMP6TYPES:
3551                         NEED1("icmptypes requires list of types");
3552                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen);
3553                         av++;
3554                         break;
3555
3556                 case TOK_IPTTL:
3557                         NEED1("ipttl requires TTL");
3558                         if (strpbrk(*av, "-,")) {
3559                             if (!add_ports(cmd, *av, 0, O_IPTTL, cblen))
3560                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3561                         } else
3562                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3563                         av++;
3564                         break;
3565
3566                 case TOK_IPID:
3567                         NEED1("ipid requires id");
3568                         if (strpbrk(*av, "-,")) {
3569                             if (!add_ports(cmd, *av, 0, O_IPID, cblen))
3570                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3571                         } else
3572                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3573                         av++;
3574                         break;
3575
3576                 case TOK_IPLEN:
3577                         NEED1("iplen requires length");
3578                         if (strpbrk(*av, "-,")) {
3579                             if (!add_ports(cmd, *av, 0, O_IPLEN, cblen))
3580                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3581                         } else
3582                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3583                         av++;
3584                         break;
3585
3586                 case TOK_IPVER:
3587                         NEED1("ipver requires version");
3588                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3589                         av++;
3590                         break;
3591
3592                 case TOK_IPPRECEDENCE:
3593                         NEED1("ipprecedence requires value");
3594                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3595                             (strtoul(*av, NULL, 0) & 7) << 5);
3596                         av++;
3597                         break;
3598
3599                 case TOK_DSCP:
3600                         NEED1("missing DSCP code");
3601                         fill_dscp(cmd, *av, cblen);
3602                         av++;
3603                         break;
3604
3605                 case TOK_IPOPTS:
3606                         NEED1("missing argument for ipoptions");
3607                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3608                         av++;
3609                         break;
3610
3611                 case TOK_IPTOS:
3612                         NEED1("missing argument for iptos");
3613                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3614                         av++;
3615                         break;
3616
3617                 case TOK_UID:
3618                         NEED1("uid requires argument");
3619                     {
3620                         char *end;
3621                         uid_t uid;
3622                         struct passwd *pwd;
3623
3624                         cmd->opcode = O_UID;
3625                         uid = strtoul(*av, &end, 0);
3626                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3627                         if (pwd == NULL)
3628                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3629                         cmd32->d[0] = pwd->pw_uid;
3630                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3631                         av++;
3632                     }
3633                         break;
3634
3635                 case TOK_GID:
3636                         NEED1("gid requires argument");
3637                     {
3638                         char *end;
3639                         gid_t gid;
3640                         struct group *grp;
3641
3642                         cmd->opcode = O_GID;
3643                         gid = strtoul(*av, &end, 0);
3644                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3645                         if (grp == NULL)
3646                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3647                         cmd32->d[0] = grp->gr_gid;
3648                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3649                         av++;
3650                     }
3651                         break;
3652
3653                 case TOK_JAIL:
3654                         NEED1("jail requires argument");
3655                     {
3656                         char *end;
3657                         int jid;
3658
3659                         cmd->opcode = O_JAIL;
3660                         jid = (int)strtol(*av, &end, 0);
3661                         if (jid < 0 || *end != '\0')
3662                                 errx(EX_DATAERR, "jail requires prison ID");
3663                         cmd32->d[0] = (uint32_t)jid;
3664                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3665                         av++;
3666                     }
3667                         break;
3668
3669                 case TOK_ESTAB:
3670                         fill_cmd(cmd, O_ESTAB, 0, 0);
3671                         break;
3672
3673                 case TOK_SETUP:
3674                         fill_cmd(cmd, O_TCPFLAGS, 0,
3675                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3676                         break;
3677
3678                 case TOK_TCPDATALEN:
3679                         NEED1("tcpdatalen requires length");
3680                         if (strpbrk(*av, "-,")) {
3681                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen))
3682                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3683                         } else
3684                             fill_cmd(cmd, O_TCPDATALEN, 0,
3685                                     strtoul(*av, NULL, 0));
3686                         av++;
3687                         break;
3688
3689                 case TOK_TCPOPTS:
3690                         NEED1("missing argument for tcpoptions");
3691                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3692                         av++;
3693                         break;
3694
3695                 case TOK_TCPSEQ:
3696                 case TOK_TCPACK:
3697                         NEED1("tcpseq/tcpack requires argument");
3698                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3699                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3700                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3701                         av++;
3702                         break;
3703
3704                 case TOK_TCPWIN:
3705                         NEED1("tcpwin requires length");
3706                         if (strpbrk(*av, "-,")) {
3707                             if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen))
3708                                 errx(EX_DATAERR, "invalid tcpwin len %s", *av);
3709                         } else
3710                             fill_cmd(cmd, O_TCPWIN, 0,
3711                                     strtoul(*av, NULL, 0));
3712                         av++;
3713                         break;
3714
3715                 case TOK_TCPFLAGS:
3716                         NEED1("missing argument for tcpflags");
3717                         cmd->opcode = O_TCPFLAGS;
3718                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3719                         av++;
3720                         break;
3721
3722                 case TOK_KEEPSTATE:
3723                         if (open_par)
3724                                 errx(EX_USAGE, "keep-state cannot be part "
3725                                     "of an or block");
3726                         if (have_state)
3727                                 errx(EX_USAGE, "only one of keep-state "
3728                                         "and limit is allowed");
3729                         have_state = cmd;
3730                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3731                         break;
3732
3733                 case TOK_LIMIT: {
3734                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3735                         int val;
3736
3737                         if (open_par)
3738                                 errx(EX_USAGE,
3739                                     "limit cannot be part of an or block");
3740                         if (have_state)
3741                                 errx(EX_USAGE, "only one of keep-state and "
3742                                     "limit is allowed");
3743                         have_state = cmd;
3744
3745                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3746                         CHECK_CMDLEN;
3747                         cmd->opcode = O_LIMIT;
3748                         c->limit_mask = c->conn_limit = 0;
3749
3750                         while ( av[0] != NULL ) {
3751                                 if ((val = match_token(limit_masks, *av)) <= 0)
3752                                         break;
3753                                 c->limit_mask |= val;
3754                                 av++;
3755                         }
3756
3757                         if (c->limit_mask == 0)
3758                                 errx(EX_USAGE, "limit: missing limit mask");
3759
3760                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3761                             TOK_LIMIT, rule_options);
3762
3763                         av++;
3764                         break;
3765                 }
3766
3767                 case TOK_PROTO:
3768                         NEED1("missing protocol");
3769                         if (add_proto(cmd, *av, &proto)) {
3770                                 av++;
3771                         } else
3772                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3773                                     *av);
3774                         break;
3775
3776                 case TOK_SRCIP:
3777                         NEED1("missing source IP");
3778                         if (add_srcip(cmd, *av, cblen)) {
3779                                 av++;
3780                         }
3781                         break;
3782
3783                 case TOK_DSTIP:
3784                         NEED1("missing destination IP");
3785                         if (add_dstip(cmd, *av, cblen)) {
3786                                 av++;
3787                         }
3788                         break;
3789
3790                 case TOK_SRCIP6:
3791                         NEED1("missing source IP6");
3792                         if (add_srcip6(cmd, *av, cblen)) {
3793                                 av++;
3794                         }
3795                         break;
3796
3797                 case TOK_DSTIP6:
3798                         NEED1("missing destination IP6");
3799                         if (add_dstip6(cmd, *av, cblen)) {
3800                                 av++;
3801                         }
3802                         break;
3803
3804                 case TOK_SRCPORT:
3805                         NEED1("missing source port");
3806                         if (_substrcmp(*av, "any") == 0 ||
3807                             add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3808                                 av++;
3809                         } else
3810                                 errx(EX_DATAERR, "invalid source port %s", *av);
3811                         break;
3812
3813                 case TOK_DSTPORT:
3814                         NEED1("missing destination port");
3815                         if (_substrcmp(*av, "any") == 0 ||
3816                             add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3817                                 av++;
3818                         } else
3819                                 errx(EX_DATAERR, "invalid destination port %s",
3820                                     *av);
3821                         break;
3822
3823                 case TOK_MAC:
3824                         if (add_mac(cmd, av, cblen))
3825                                 av += 2;
3826                         break;
3827
3828                 case TOK_MACTYPE:
3829                         NEED1("missing mac type");
3830                         if (!add_mactype(cmd, *av, cblen))
3831                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3832                         av++;
3833                         break;
3834
3835                 case TOK_VERREVPATH:
3836                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3837                         break;
3838
3839                 case TOK_VERSRCREACH:
3840                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3841                         break;
3842
3843                 case TOK_ANTISPOOF:
3844                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3845                         break;
3846
3847                 case TOK_IPSEC:
3848                         fill_cmd(cmd, O_IPSEC, 0, 0);
3849                         break;
3850
3851                 case TOK_IPV6:
3852                         fill_cmd(cmd, O_IP6, 0, 0);
3853                         break;
3854
3855                 case TOK_IPV4:
3856                         fill_cmd(cmd, O_IP4, 0, 0);
3857                         break;
3858
3859                 case TOK_EXT6HDR:
3860                         fill_ext6hdr( cmd, *av );
3861                         av++;
3862                         break;
3863
3864                 case TOK_FLOWID:
3865                         if (proto != IPPROTO_IPV6 )
3866                                 errx( EX_USAGE, "flow-id filter is active "
3867                                     "only for ipv6 protocol\n");
3868                         fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen);
3869                         av++;
3870                         break;
3871
3872                 case TOK_COMMENT:
3873                         fill_comment(cmd, av, cblen);
3874                         av[0]=NULL;
3875                         break;
3876
3877                 case TOK_TAGGED:
3878                         if (av[0] && strpbrk(*av, "-,")) {
3879                                 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen))
3880                                         errx(EX_DATAERR, "tagged: invalid tag"
3881                                             " list: %s", *av);
3882                         }
3883                         else {
3884                                 uint16_t tag;
3885
3886                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3887                                     TOK_TAGGED, rule_options);
3888                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3889                         }
3890                         av++;
3891                         break;
3892
3893                 case TOK_FIB:
3894                         NEED1("fib requires fib number");
3895                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3896                         av++;
3897                         break;
3898                 case TOK_SOCKARG:
3899                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3900                         break;
3901
3902                 case TOK_LOOKUP: {
3903                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3904                         char *p;
3905                         int j;
3906
3907                         if (!av[0] || !av[1])
3908                                 errx(EX_USAGE, "format: lookup argument tablenum");
3909                         cmd->opcode = O_IP_DST_LOOKUP;
3910                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3911                         i = match_token(rule_options, *av);
3912                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3913                                 if (i == lookup_key[j])
3914                                         break;
3915                         }
3916                         if (lookup_key[j] <= 0)
3917                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3918                         __PAST_END(c->d, 1) = j; // i converted to option
3919                         av++;
3920                         cmd->arg1 = strtoul(*av, &p, 0);
3921                         if (p && *p)
3922                                 errx(EX_USAGE, "format: lookup argument tablenum");
3923                         av++;
3924                     }
3925                         break;
3926
3927                 default:
3928                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3929                 }
3930                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3931                         prev = cmd;
3932                         cmd = next_cmd(cmd, &cblen);
3933                 }
3934         }
3935
3936 done:
3937         /*
3938          * Now copy stuff into the rule.
3939          * If we have a keep-state option, the first instruction
3940          * must be a PROBE_STATE (which is generated here).
3941          * If we have a LOG option, it was stored as the first command,
3942          * and now must be moved to the top of the action part.
3943          */
3944         dst = (ipfw_insn *)rule->cmd;
3945
3946         /*
3947          * First thing to write into the command stream is the match probability.
3948          */
3949         if (match_prob != 1) { /* 1 means always match */
3950                 dst->opcode = O_PROB;
3951                 dst->len = 2;
3952                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3953                 dst += dst->len;
3954         }
3955
3956         /*
3957          * generate O_PROBE_STATE if necessary
3958          */
3959         if (have_state && have_state->opcode != O_CHECK_STATE) {
3960                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3961                 dst = next_cmd(dst, &rblen);
3962         }
3963
3964         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3965         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3966                 i = F_LEN(src);
3967                 CHECK_RBUFLEN(i);
3968
3969                 switch (src->opcode) {
3970                 case O_LOG:
3971                 case O_KEEP_STATE:
3972                 case O_LIMIT:
3973                 case O_ALTQ:
3974                 case O_TAG:
3975                         break;
3976                 default:
3977                         bcopy(src, dst, i * sizeof(uint32_t));
3978                         dst += i;
3979                 }
3980         }
3981
3982         /*
3983          * put back the have_state command as last opcode
3984          */
3985         if (have_state && have_state->opcode != O_CHECK_STATE) {
3986                 i = F_LEN(have_state);
3987                 CHECK_RBUFLEN(i);
3988                 bcopy(have_state, dst, i * sizeof(uint32_t));
3989                 dst += i;
3990         }
3991         /*
3992          * start action section
3993          */
3994         rule->act_ofs = dst - rule->cmd;
3995
3996         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3997         if (have_log) {
3998                 i = F_LEN(have_log);
3999                 CHECK_RBUFLEN(i);
4000                 bcopy(have_log, dst, i * sizeof(uint32_t));
4001                 dst += i;
4002         }
4003         if (have_altq) {
4004                 i = F_LEN(have_altq);
4005                 CHECK_RBUFLEN(i);
4006                 bcopy(have_altq, dst, i * sizeof(uint32_t));
4007                 dst += i;
4008         }
4009         if (have_tag) {
4010                 i = F_LEN(have_tag);
4011                 CHECK_RBUFLEN(i);
4012                 bcopy(have_tag, dst, i * sizeof(uint32_t));
4013                 dst += i;
4014         }
4015
4016         /*
4017          * copy all other actions
4018          */
4019         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
4020                 i = F_LEN(src);
4021                 CHECK_RBUFLEN(i);
4022                 bcopy(src, dst, i * sizeof(uint32_t));
4023                 dst += i;
4024         }
4025
4026         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
4027         i = (char *)dst - (char *)rule;
4028         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
4029                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
4030         if (!co.do_quiet)
4031                 show_ipfw(rule, 0, 0);
4032 }
4033
4034 /*
4035  * clear the counters or the log counters.
4036  */
4037 void
4038 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
4039 {
4040         uint32_t arg, saved_arg;
4041         int failed = EX_OK;
4042         char const *errstr;
4043         char const *name = optname ? "RESETLOG" : "ZERO";
4044
4045         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
4046
4047         av++; ac--;
4048
4049         if (!ac) {
4050                 /* clear all entries */
4051                 if (do_cmd(optname, NULL, 0) < 0)
4052                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
4053                 if (!co.do_quiet)
4054                         printf("%s.\n", optname == IP_FW_ZERO ?
4055                             "Accounting cleared":"Logging counts reset");
4056
4057                 return;
4058         }
4059
4060         while (ac) {
4061                 /* Rule number */
4062                 if (isdigit(**av)) {
4063                         arg = strtonum(*av, 0, 0xffff, &errstr);
4064                         if (errstr)
4065                                 errx(EX_DATAERR,
4066                                     "invalid rule number %s\n", *av);
4067                         saved_arg = arg;
4068                         if (co.use_set)
4069                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
4070                         av++;
4071                         ac--;
4072                         if (do_cmd(optname, &arg, sizeof(arg))) {
4073                                 warn("rule %u: setsockopt(IP_FW_%s)",
4074                                     saved_arg, name);
4075                                 failed = EX_UNAVAILABLE;
4076                         } else if (!co.do_quiet)
4077                                 printf("Entry %d %s.\n", saved_arg,
4078                                     optname == IP_FW_ZERO ?
4079                                         "cleared" : "logging count reset");
4080                 } else {
4081                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
4082                 }
4083         }
4084         if (failed != EX_OK)
4085                 exit(failed);
4086 }
4087
4088 void
4089 ipfw_flush(int force)
4090 {
4091         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
4092
4093         if (!force && !co.do_quiet) { /* need to ask user */
4094                 int c;
4095
4096                 printf("Are you sure? [yn] ");
4097                 fflush(stdout);
4098                 do {
4099                         c = toupper(getc(stdin));
4100                         while (c != '\n' && getc(stdin) != '\n')
4101                                 if (feof(stdin))
4102                                         return; /* and do not flush */
4103                 } while (c != 'Y' && c != 'N');
4104                 printf("\n");
4105                 if (c == 'N')   /* user said no */
4106                         return;
4107         }
4108         if (co.do_pipe) {
4109                 dummynet_flush();
4110                 return;
4111         }
4112         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
4113         if (co.use_set) {
4114                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
4115                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
4116                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
4117         } else if (do_cmd(cmd, NULL, 0) < 0)
4118                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
4119                     co.do_pipe ? "DUMMYNET" : "FW");
4120         if (!co.do_quiet)
4121                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
4122 }
4123
4124
4125 static void table_list(uint16_t num, int need_header);
4126 static void table_fill_xentry(char *arg, ipfw_table_xentry *xent);
4127
4128 /*
4129  * Retrieve maximum number of tables supported by ipfw(4) module.
4130  */
4131 uint32_t
4132 ipfw_get_tables_max()
4133 {
4134         size_t len;
4135         uint32_t tables_max;
4136
4137         if (ipfw_tables_max != 0)
4138                 return (ipfw_tables_max);
4139
4140         len = sizeof(tables_max);
4141         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
4142             NULL, 0) == -1) {
4143                 if (co.test_only)
4144                         tables_max = 128; /* Old conservative default */
4145                 else
4146                         errx(1, "Can't determine maximum number of ipfw tables."
4147                             " Perhaps you forgot to load ipfw module?");
4148         }
4149
4150         ipfw_tables_max = tables_max;
4151
4152         return (ipfw_tables_max);
4153 }
4154
4155 /*
4156  * This one handles all table-related commands
4157  *      ipfw table N add addr[/masklen] [value]
4158  *      ipfw table N delete addr[/masklen]
4159  *      ipfw table {N | all} flush
4160  *      ipfw table {N | all} list
4161  */
4162 void
4163 ipfw_table_handler(int ac, char *av[])
4164 {
4165         ipfw_table_xentry xent;
4166         int do_add;
4167         int is_all;
4168         uint32_t a;
4169         uint32_t tables_max;
4170
4171         tables_max = ipfw_get_tables_max();
4172
4173         memset(&xent, 0, sizeof(xent));
4174
4175         ac--; av++;
4176         if (ac && isdigit(**av)) {
4177                 xent.tbl = atoi(*av);
4178                 is_all = 0;
4179                 ac--; av++;
4180         } else if (ac && _substrcmp(*av, "all") == 0) {
4181                 xent.tbl = 0;
4182                 is_all = 1;
4183                 ac--; av++;
4184         } else
4185                 errx(EX_USAGE, "table number or 'all' keyword required");
4186         if (xent.tbl >= tables_max)
4187                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
4188                         "value (%d)", tables_max - 1);
4189         NEED1("table needs command");
4190         if (is_all && _substrcmp(*av, "list") != 0
4191                    && _substrcmp(*av, "flush") != 0)
4192                 errx(EX_USAGE, "table number required");
4193
4194         if (_substrcmp(*av, "add") == 0 ||
4195             _substrcmp(*av, "delete") == 0) {
4196                 do_add = **av == 'a';
4197                 ac--; av++;
4198                 if (!ac)
4199                         errx(EX_USAGE, "address required");
4200
4201                 table_fill_xentry(*av, &xent);
4202
4203                 ac--; av++;
4204                 if (do_add && ac) {
4205                         unsigned int tval;
4206                         /* isdigit is a bit of a hack here.. */
4207                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
4208                                 xent.value = strtoul(*av, NULL, 0);
4209                         } else {
4210                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
4211                                         /* The value must be stored in host order        *
4212                                          * so that the values < 65k can be distinguished */
4213                                         xent.value = ntohl(tval);
4214                                 } else {
4215                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
4216                                 }
4217                         }
4218                 } else
4219                         xent.value = 0;
4220                 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL,
4221                     &xent, xent.len) < 0) {
4222                         /* If running silent, don't bomb out on these errors. */
4223                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
4224                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
4225                                     do_add ? "XADD" : "XDEL");
4226                         /* In silent mode, react to a failed add by deleting */
4227                         if (do_add) {
4228                                 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len);
4229                                 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0)
4230                                         err(EX_OSERR,
4231                                             "setsockopt(IP_FW_TABLE_XADD)");
4232                         }
4233                 }
4234         } else if (_substrcmp(*av, "flush") == 0) {
4235                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4236                 do {
4237                         if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl,
4238                             sizeof(xent.tbl)) < 0)
4239                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
4240                 } while (++xent.tbl < a);
4241         } else if (_substrcmp(*av, "list") == 0) {
4242                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4243                 do {
4244                         table_list(xent.tbl, is_all);
4245                 } while (++xent.tbl < a);
4246         } else
4247                 errx(EX_USAGE, "invalid table command %s", *av);
4248 }
4249
4250 static void
4251 table_fill_xentry(char *arg, ipfw_table_xentry *xent)
4252 {
4253         int addrlen, mask, masklen, type;
4254         struct in6_addr *paddr;
4255         uint32_t *pkey;
4256         char *p;
4257         uint32_t key;
4258
4259         mask = 0;
4260         type = 0;
4261         addrlen = 0;
4262         masklen = 0;
4263
4264         /*
4265          * Let's try to guess type by agrument.
4266          * Possible types:
4267          * 1) IPv4[/mask]
4268          * 2) IPv6[/mask]
4269          * 3) interface name
4270          * 4) port, uid/gid or other u32 key (base 10 format)
4271          * 5) hostname
4272          */
4273         paddr = &xent->k.addr6;
4274         if (ishexnumber(*arg) != 0 || *arg == ':') {
4275                 /* Remove / if exists */
4276                 if ((p = strchr(arg, '/')) != NULL) {
4277                         *p = '\0';
4278                         mask = atoi(p + 1);
4279                 }
4280
4281                 if (inet_pton(AF_INET, arg, paddr) == 1) {
4282                         if (p != NULL && mask > 32)
4283                                 errx(EX_DATAERR, "bad IPv4 mask width: %s",
4284                                     p + 1);
4285
4286                         type = IPFW_TABLE_CIDR;
4287                         masklen = p ? mask : 32;
4288                         addrlen = sizeof(struct in_addr);
4289                 } else if (inet_pton(AF_INET6, arg, paddr) == 1) {
4290                         if (IN6_IS_ADDR_V4COMPAT(paddr))
4291                                 errx(EX_DATAERR,
4292                                     "Use IPv4 instead of v4-compatible");
4293                         if (p != NULL && mask > 128)
4294                                 errx(EX_DATAERR, "bad IPv6 mask width: %s",
4295                                     p + 1);
4296
4297                         type = IPFW_TABLE_CIDR;
4298                         masklen = p ? mask : 128;
4299                         addrlen = sizeof(struct in6_addr);
4300                 } else {
4301                         /* Port or any other key */
4302                         /* Skip non-base 10 entries like 'fa1' */
4303                         key = strtol(arg, &p, 10);
4304                         if (*p == '\0') {
4305                                 pkey = (uint32_t *)paddr;
4306                                 *pkey = htonl(key);
4307                                 type = IPFW_TABLE_CIDR;
4308                                 masklen = 32;
4309                                 addrlen = sizeof(uint32_t);
4310                         } else if ((p != arg) && (*p == '.')) {
4311                                 /*
4312                                  * Warn on IPv4 address strings
4313                                  * which are "valid" for inet_aton() but not
4314                                  * in inet_pton().
4315                                  *
4316                                  * Typical examples: '10.5' or '10.0.0.05'
4317                                  */
4318                                 errx(EX_DATAERR,
4319                                     "Invalid IPv4 address: %s", arg);
4320                         }
4321                 }
4322         }
4323
4324         if (type == 0 && strchr(arg, '.') == NULL) {
4325                 /* Assume interface name. Copy significant data only */
4326                 mask = MIN(strlen(arg), IF_NAMESIZE - 1);
4327                 memcpy(xent->k.iface, arg, mask);
4328                 /* Set mask to exact match */
4329                 masklen = 8 * IF_NAMESIZE;
4330                 type = IPFW_TABLE_INTERFACE;
4331                 addrlen = IF_NAMESIZE;
4332         }
4333
4334         if (type == 0) {
4335                 if (lookup_host(arg, (struct in_addr *)paddr) != 0)
4336                         errx(EX_NOHOST, "hostname ``%s'' unknown", arg);
4337
4338                 masklen = 32;
4339                 type = IPFW_TABLE_CIDR;
4340                 addrlen = sizeof(struct in_addr);
4341         }
4342
4343         xent->type = type;
4344         xent->masklen = masklen;
4345         xent->len = offsetof(ipfw_table_xentry, k) + addrlen;
4346 }
4347
4348 static void
4349 table_list(uint16_t num, int need_header)
4350 {
4351         ipfw_xtable *tbl;
4352         ipfw_table_xentry *xent;
4353         socklen_t l;
4354         uint32_t *a, sz, tval;
4355         char tbuf[128];
4356         struct in6_addr *addr6;
4357         ip_fw3_opheader *op3;
4358
4359         /* Prepend value with IP_FW3 header */
4360         l = sizeof(ip_fw3_opheader) + sizeof(uint32_t);
4361         op3 = alloca(l);
4362         /* Zero reserved fields */
4363         memset(op3, 0, sizeof(ip_fw3_opheader));
4364         a = (uint32_t *)(op3 + 1);
4365         *a = num;
4366         op3->opcode = IP_FW_TABLE_XGETSIZE;
4367         if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0)
4368                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)");
4369
4370         /* If a is zero we have nothing to do, the table is empty. */
4371         if (*a == 0)
4372                 return;
4373
4374         l = *a;
4375         tbl = safe_calloc(1, l);
4376         tbl->opheader.opcode = IP_FW_TABLE_XLIST;
4377         tbl->tbl = num;
4378         if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0)
4379                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)");
4380         if (tbl->cnt && need_header)
4381                 printf("---table(%d)---\n", tbl->tbl);
4382         sz = tbl->size - sizeof(ipfw_xtable);
4383         xent = &tbl->xent[0];
4384         while (sz > 0) {
4385                 switch (tbl->type) {
4386                 case IPFW_TABLE_CIDR:
4387                         /* IPv4 or IPv6 prefixes */
4388                         tval = xent->value;
4389                         addr6 = &xent->k.addr6;
4390
4391
4392                         if (IN6_IS_ADDR_V4COMPAT(addr6)) {
4393                                 /* IPv4 address */
4394                                 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf));
4395                         } else {
4396                                 /* IPv6 address */
4397                                 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf));
4398                         }
4399
4400                         if (co.do_value_as_ip) {
4401                                 tval = htonl(tval);
4402                                 printf("%s/%u %s\n", tbuf, xent->masklen,
4403                                     inet_ntoa(*(struct in_addr *)&tval));
4404                         } else
4405                                 printf("%s/%u %u\n", tbuf, xent->masklen, tval);
4406                         break;
4407                 case IPFW_TABLE_INTERFACE:
4408                         /* Interface names */
4409                         tval = xent->value;
4410                         if (co.do_value_as_ip) {
4411                                 tval = htonl(tval);
4412                                 printf("%s %s\n", xent->k.iface,
4413                                     inet_ntoa(*(struct in_addr *)&tval));
4414                         } else
4415                                 printf("%s %u\n", xent->k.iface, tval);
4416                 }
4417
4418                 if (sz < xent->len)
4419                         break;
4420                 sz -= xent->len;
4421                 xent = (ipfw_table_xentry *)((char *)xent + xent->len);
4422         }
4423
4424         free(tbl);
4425 }