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