sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002-2003 Luigi Rizzo
   3  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
   4  * Copyright (c) 1994 Ugen J.S.Antsilevich
   5  *
   6  * Idea and grammar partially left from:
   7  * Copyright (c) 1993 Daniel Boulet
   8  *
   9  * Redistribution and use in source forms, with and without modification,
  10  * are permitted provided that this entire comment appears intact.
  11  *
  12  * Redistribution in binary form may occur without any restrictions.
  13  * Obviously, it would be nice if you gave credit where credit is due
  14  * but requiring it would be too onerous.
  15  *
  16  * This software is provided ``AS IS'' without any warranties of any kind.
  17  *
  18  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD$
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/param.h>
  25 #include <sys/socket.h>
  26 #include <sys/sockio.h>
  27 #include <sys/sysctl.h>
  28
  29 #include "ipfw2.h"
  30
  31 #include <ctype.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <grp.h>
  35 #include <netdb.h>
  36 #include <pwd.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <sysexits.h>
  41 #include <time.h>       /* ctime */
  42 #include <timeconv.h>   /* _long_to_time */
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45 #include <stddef.h>     /* offsetof */
  46
  47 #include <net/ethernet.h>
  48 #include <net/if.h>             /* only IFNAMSIZ */
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>   /* only n_short, n_long */
  51 #include <netinet/ip.h>
  52 #include <netinet/ip_icmp.h>
  53 #include <netinet/ip_fw.h>
  54 #include <netinet/tcp.h>
  55 #include <arpa/inet.h>
  56
  57 struct cmdline_opts co; /* global options */
  58
  59 int resvd_set_number = RESVD_SET;
  60
  61 int ipfw_socket = -1;
  62
  63 #ifndef s6_addr32
  64 #define s6_addr32 __u6_addr.__u6_addr32
  65 #endif
  66
  67 #define CHECK_LENGTH(v, len) do {                               \
  68         if ((v) < (len))                                        \
  69                 errx(EX_DATAERR, "Rule too long");              \
  70         } while (0)
  71 /*
  72  * Check if we have enough space in cmd buffer. Note that since
  73  * first 8? u32 words are reserved by reserved header, full cmd
  74  * buffer can't be used, so we need to protect from buffer overrun
  75  * only. At the beginnig, cblen is less than actual buffer size by
  76  * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need
  77  * for checking small instructions fitting in given range.
  78  * We also (ab)use the fact that ipfw_insn is always the first field
  79  * for any custom instruction.
  80  */
  81 #define CHECK_CMDLEN    CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd))
  82
  83 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  84         if (!av[0])                                                     \
  85                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  86         if (_substrcmp(*av, "tablearg") == 0) {                         \
  87                 arg = IP_FW_TABLEARG;                                   \
  88                 break;                                                  \
  89         }                                                               \
  90                                                                         \
  91         {                                                               \
  92         long _xval;                                                     \
  93         char *end;                                                      \
  94                                                                         \
  95         _xval = strtol(*av, &end, 10);                                  \
  96                                                                         \
  97         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  98                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  99                     match_value(s_x, tok), *av);                        \
 100                                                                         \
 101         if (errno == ERANGE || _xval < min || _xval > max)              \
 102                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
 103                     match_value(s_x, tok), min, max, *av);              \
 104                                                                         \
 105         if (_xval == IP_FW_TABLEARG)                                    \
 106                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
 107                     match_value(s_x, tok), *av);                        \
 108         arg = _xval;                                                    \
 109         }                                                               \
 110 } while (0)
 111
 112 static void
 113 PRINT_UINT_ARG(const char *str, uint32_t arg)
 114 {
 115         if (str != NULL)
 116                 printf("%s",str);
 117         if (arg == IP_FW_TABLEARG)
 118                 printf("tablearg");
 119         else
 120                 printf("%u", arg);
 121 }
 122
 123 static struct _s_x f_tcpflags[] = {
 124         { "syn", TH_SYN },
 125         { "fin", TH_FIN },
 126         { "ack", TH_ACK },
 127         { "psh", TH_PUSH },
 128         { "rst", TH_RST },
 129         { "urg", TH_URG },
 130         { "tcp flag", 0 },
 131         { NULL, 0 }
 132 };
 133
 134 static struct _s_x f_tcpopts[] = {
 135         { "mss",        IP_FW_TCPOPT_MSS },
 136         { "maxseg",     IP_FW_TCPOPT_MSS },
 137         { "window",     IP_FW_TCPOPT_WINDOW },
 138         { "sack",       IP_FW_TCPOPT_SACK },
 139         { "ts",         IP_FW_TCPOPT_TS },
 140         { "timestamp",  IP_FW_TCPOPT_TS },
 141         { "cc",         IP_FW_TCPOPT_CC },
 142         { "tcp option", 0 },
 143         { NULL, 0 }
 144 };
 145
 146 /*
 147  * IP options span the range 0 to 255 so we need to remap them
 148  * (though in fact only the low 5 bits are significant).
 149  */
 150 static struct _s_x f_ipopts[] = {
 151         { "ssrr",       IP_FW_IPOPT_SSRR},
 152         { "lsrr",       IP_FW_IPOPT_LSRR},
 153         { "rr",         IP_FW_IPOPT_RR},
 154         { "ts",         IP_FW_IPOPT_TS},
 155         { "ip option",  0 },
 156         { NULL, 0 }
 157 };
 158
 159 static struct _s_x f_iptos[] = {
 160         { "lowdelay",   IPTOS_LOWDELAY},
 161         { "throughput", IPTOS_THROUGHPUT},
 162         { "reliability", IPTOS_RELIABILITY},
 163         { "mincost",    IPTOS_MINCOST},
 164         { "congestion", IPTOS_ECN_CE},
 165         { "ecntransport", IPTOS_ECN_ECT0},
 166         { "ip tos option", 0},
 167         { NULL, 0 }
 168 };
 169
 170 static struct _s_x limit_masks[] = {
 171         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 172         {"src-addr",    DYN_SRC_ADDR},
 173         {"src-port",    DYN_SRC_PORT},
 174         {"dst-addr",    DYN_DST_ADDR},
 175         {"dst-port",    DYN_DST_PORT},
 176         {NULL,          0}
 177 };
 178
 179 /*
 180  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 181  * This is only used in this code.
 182  */
 183 #define IPPROTO_ETHERTYPE       0x1000
 184 static struct _s_x ether_types[] = {
 185     /*
 186      * Note, we cannot use "-:&/" in the names because they are field
 187      * separators in the type specifications. Also, we use s = NULL as
 188      * end-delimiter, because a type of 0 can be legal.
 189      */
 190         { "ip",         0x0800 },
 191         { "ipv4",       0x0800 },
 192         { "ipv6",       0x86dd },
 193         { "arp",        0x0806 },
 194         { "rarp",       0x8035 },
 195         { "vlan",       0x8100 },
 196         { "loop",       0x9000 },
 197         { "trail",      0x1000 },
 198         { "at",         0x809b },
 199         { "atalk",      0x809b },
 200         { "aarp",       0x80f3 },
 201         { "pppoe_disc", 0x8863 },
 202         { "pppoe_sess", 0x8864 },
 203         { "ipx_8022",   0x00E0 },
 204         { "ipx_8023",   0x0000 },
 205         { "ipx_ii",     0x8137 },
 206         { "ipx_snap",   0x8137 },
 207         { "ipx",        0x8137 },
 208         { "ns",         0x0600 },
 209         { NULL,         0 }
 210 };
 211
 212
 213 static struct _s_x rule_actions[] = {
 214         { "accept",             TOK_ACCEPT },
 215         { "pass",               TOK_ACCEPT },
 216         { "allow",              TOK_ACCEPT },
 217         { "permit",             TOK_ACCEPT },
 218         { "count",              TOK_COUNT },
 219         { "pipe",               TOK_PIPE },
 220         { "queue",              TOK_QUEUE },
 221         { "divert",             TOK_DIVERT },
 222         { "tee",                TOK_TEE },
 223         { "netgraph",           TOK_NETGRAPH },
 224         { "ngtee",              TOK_NGTEE },
 225         { "fwd",                TOK_FORWARD },
 226         { "forward",            TOK_FORWARD },
 227         { "skipto",             TOK_SKIPTO },
 228         { "deny",               TOK_DENY },
 229         { "drop",               TOK_DENY },
 230         { "reject",             TOK_REJECT },
 231         { "reset6",             TOK_RESET6 },
 232         { "reset",              TOK_RESET },
 233         { "unreach6",           TOK_UNREACH6 },
 234         { "unreach",            TOK_UNREACH },
 235         { "check-state",        TOK_CHECKSTATE },
 236         { "//",                 TOK_COMMENT },
 237         { "nat",                TOK_NAT },
 238         { "reass",              TOK_REASS },
 239         { "setfib",             TOK_SETFIB },
 240         { "call",               TOK_CALL },
 241         { "return",             TOK_RETURN },
 242         { NULL, 0 }     /* terminator */
 243 };
 244
 245 static struct _s_x rule_action_params[] = {
 246         { "altq",               TOK_ALTQ },
 247         { "log",                TOK_LOG },
 248         { "tag",                TOK_TAG },
 249         { "untag",              TOK_UNTAG },
 250         { NULL, 0 }     /* terminator */
 251 };
 252
 253 /*
 254  * The 'lookup' instruction accepts one of the following arguments.
 255  * -1 is a terminator for the list.
 256  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 257  */
 258 static int lookup_key[] = {
 259         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 260         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 261
 262 static struct _s_x rule_options[] = {
 263         { "tagged",             TOK_TAGGED },
 264         { "uid",                TOK_UID },
 265         { "gid",                TOK_GID },
 266         { "jail",               TOK_JAIL },
 267         { "in",                 TOK_IN },
 268         { "limit",              TOK_LIMIT },
 269         { "keep-state",         TOK_KEEPSTATE },
 270         { "bridged",            TOK_LAYER2 },
 271         { "layer2",             TOK_LAYER2 },
 272         { "out",                TOK_OUT },
 273         { "diverted",           TOK_DIVERTED },
 274         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 275         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 276         { "xmit",               TOK_XMIT },
 277         { "recv",               TOK_RECV },
 278         { "via",                TOK_VIA },
 279         { "fragment",           TOK_FRAG },
 280         { "frag",               TOK_FRAG },
 281         { "fib",                TOK_FIB },
 282         { "ipoptions",          TOK_IPOPTS },
 283         { "ipopts",             TOK_IPOPTS },
 284         { "iplen",              TOK_IPLEN },
 285         { "ipid",               TOK_IPID },
 286         { "ipprecedence",       TOK_IPPRECEDENCE },
 287         { "dscp",               TOK_DSCP },
 288         { "iptos",              TOK_IPTOS },
 289         { "ipttl",              TOK_IPTTL },
 290         { "ipversion",          TOK_IPVER },
 291         { "ipver",              TOK_IPVER },
 292         { "estab",              TOK_ESTAB },
 293         { "established",        TOK_ESTAB },
 294         { "setup",              TOK_SETUP },
 295         { "sockarg",            TOK_SOCKARG },
 296         { "tcpdatalen",         TOK_TCPDATALEN },
 297         { "tcpflags",           TOK_TCPFLAGS },
 298         { "tcpflgs",            TOK_TCPFLAGS },
 299         { "tcpoptions",         TOK_TCPOPTS },
 300         { "tcpopts",            TOK_TCPOPTS },
 301         { "tcpseq",             TOK_TCPSEQ },
 302         { "tcpack",             TOK_TCPACK },
 303         { "tcpwin",             TOK_TCPWIN },
 304         { "icmptype",           TOK_ICMPTYPES },
 305         { "icmptypes",          TOK_ICMPTYPES },
 306         { "dst-ip",             TOK_DSTIP },
 307         { "src-ip",             TOK_SRCIP },
 308         { "dst-port",           TOK_DSTPORT },
 309         { "src-port",           TOK_SRCPORT },
 310         { "proto",              TOK_PROTO },
 311         { "MAC",                TOK_MAC },
 312         { "mac",                TOK_MAC },
 313         { "mac-type",           TOK_MACTYPE },
 314         { "verrevpath",         TOK_VERREVPATH },
 315         { "versrcreach",        TOK_VERSRCREACH },
 316         { "antispoof",          TOK_ANTISPOOF },
 317         { "ipsec",              TOK_IPSEC },
 318         { "icmp6type",          TOK_ICMP6TYPES },
 319         { "icmp6types",         TOK_ICMP6TYPES },
 320         { "ext6hdr",            TOK_EXT6HDR},
 321         { "flow-id",            TOK_FLOWID},
 322         { "ipv6",               TOK_IPV6},
 323         { "ip6",                TOK_IPV6},
 324         { "ipv4",               TOK_IPV4},
 325         { "ip4",                TOK_IPV4},
 326         { "dst-ipv6",           TOK_DSTIP6},
 327         { "dst-ip6",            TOK_DSTIP6},
 328         { "src-ipv6",           TOK_SRCIP6},
 329         { "src-ip6",            TOK_SRCIP6},
 330         { "lookup",             TOK_LOOKUP},
 331         { "//",                 TOK_COMMENT },
 332
 333         { "not",                TOK_NOT },              /* pseudo option */
 334         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 335         { "or",                 TOK_OR },               /* pseudo option */
 336         { "|", /* escape */     TOK_OR },               /* pseudo option */
 337         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 338         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 339         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 340         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 341         { NULL, 0 }     /* terminator */
 342 };
 343
 344 /*
 345  * Helper routine to print a possibly unaligned uint64_t on
 346  * various platform. If width > 0, print the value with
 347  * the desired width, followed by a space;
 348  * otherwise, return the required width.
 349  */
 350 int
 351 pr_u64(uint64_t *pd, int width)
 352 {
 353 #ifdef TCC
 354 #define U64_FMT "I64"
 355 #else
 356 #define U64_FMT "llu"
 357 #endif
 358         uint64_t u;
 359         unsigned long long d;
 360
 361         bcopy (pd, &u, sizeof(u));
 362         d = u;
 363         return (width > 0) ?
 364                 printf("%*" U64_FMT " ", width, d) :
 365                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 366 #undef U64_FMT
 367 }
 368
 369 void *
 370 safe_calloc(size_t number, size_t size)
 371 {
 372         void *ret = calloc(number, size);
 373
 374         if (ret == NULL)
 375                 err(EX_OSERR, "calloc");
 376         return ret;
 377 }
 378
 379 void *
 380 safe_realloc(void *ptr, size_t size)
 381 {
 382         void *ret = realloc(ptr, size);
 383
 384         if (ret == NULL)
 385                 err(EX_OSERR, "realloc");
 386         return ret;
 387 }
 388
 389 /*
 390  * conditionally runs the command.
 391  * Selected options or negative -> getsockopt
 392  */
 393 int
 394 do_cmd(int optname, void *optval, uintptr_t optlen)
 395 {
 396         int i;
 397
 398         if (co.test_only)
 399                 return 0;
 400
 401         if (ipfw_socket == -1)
 402                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 403         if (ipfw_socket < 0)
 404                 err(EX_UNAVAILABLE, "socket");
 405
 406         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 407             optname == IP_FW_ADD || optname == IP_FW3 ||
 408             optname == IP_FW_NAT_GET_CONFIG ||
 409             optname < 0 ||
 410             optname == IP_FW_NAT_GET_LOG) {
 411                 if (optname < 0)
 412                         optname = -optname;
 413                 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval,
 414                         (socklen_t *)optlen);
 415         } else {
 416                 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen);
 417         }
 418         return i;
 419 }
 420
 421 /*
 422  * do_setcmd3 - pass ipfw control cmd to kernel
 423  * @optname: option name
 424  * @optval: pointer to option data
 425  * @optlen: option length
 426  *
 427  * Function encapsulates option value in IP_FW3 socket option
 428  * and calls setsockopt().
 429  * Function returns 0 on success or -1 otherwise.
 430  */
 431 int
 432 do_setcmd3(int optname, void *optval, socklen_t optlen)
 433 {
 434         socklen_t len;
 435         ip_fw3_opheader *op3;
 436
 437         if (co.test_only)
 438                 return (0);
 439
 440         if (ipfw_socket == -1)
 441                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 442         if (ipfw_socket < 0)
 443                 err(EX_UNAVAILABLE, "socket");
 444
 445         len = sizeof(ip_fw3_opheader) + optlen;
 446         op3 = alloca(len);
 447         /* Zero reserved fields */
 448         memset(op3, 0, sizeof(ip_fw3_opheader));
 449         memcpy(op3 + 1, optval, optlen);
 450         op3->opcode = optname;
 451
 452         return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len);
 453 }
 454
 455 /**
 456  * match_token takes a table and a string, returns the value associated
 457  * with the string (-1 in case of failure).
 458  */
 459 int
 460 match_token(struct _s_x *table, char *string)
 461 {
 462         struct _s_x *pt;
 463         uint i = strlen(string);
 464
 465         for (pt = table ; i && pt->s != NULL ; pt++)
 466                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 467                         return pt->x;
 468         return -1;
 469 }
 470
 471 /**
 472  * match_value takes a table and a value, returns the string associated
 473  * with the value (NULL in case of failure).
 474  */
 475 char const *
 476 match_value(struct _s_x *p, int value)
 477 {
 478         for (; p->s != NULL; p++)
 479                 if (p->x == value)
 480                         return p->s;
 481         return NULL;
 482 }
 483
 484 /*
 485  * _substrcmp takes two strings and returns 1 if they do not match,
 486  * and 0 if they match exactly or the first string is a sub-string
 487  * of the second.  A warning is printed to stderr in the case that the
 488  * first string is a sub-string of the second.
 489  *
 490  * This function will be removed in the future through the usual
 491  * deprecation process.
 492  */
 493 int
 494 _substrcmp(const char *str1, const char* str2)
 495 {
 496
 497         if (strncmp(str1, str2, strlen(str1)) != 0)
 498                 return 1;
 499
 500         if (strlen(str1) != strlen(str2))
 501                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 502                     str1, str2);
 503         return 0;
 504 }
 505
 506 /*
 507  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 508  * and 0 if they match exactly or the second string is a sub-string
 509  * of the first.  A warning is printed to stderr in the case that the
 510  * first string does not match the third.
 511  *
 512  * This function exists to warn about the bizzare construction
 513  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 514  * for "bytes".  The problem is that in addition to accepting "by",
 515  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 516  * other string beginning with "by".
 517  *
 518  * This function will be removed in the future through the usual
 519  * deprecation process.
 520  */
 521 int
 522 _substrcmp2(const char *str1, const char* str2, const char* str3)
 523 {
 524
 525         if (strncmp(str1, str2, strlen(str2)) != 0)
 526                 return 1;
 527
 528         if (strcmp(str1, str3) != 0)
 529                 warnx("DEPRECATED: '%s' matched '%s'",
 530                     str1, str3);
 531         return 0;
 532 }
 533
 534 /*
 535  * prints one port, symbolic or numeric
 536  */
 537 static void
 538 print_port(int proto, uint16_t port)
 539 {
 540
 541         if (proto == IPPROTO_ETHERTYPE) {
 542                 char const *s;
 543
 544                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 545                         printf("%s", s);
 546                 else
 547                         printf("0x%04x", port);
 548         } else {
 549                 struct servent *se = NULL;
 550                 if (co.do_resolv) {
 551                         struct protoent *pe = getprotobynumber(proto);
 552
 553                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 554                 }
 555                 if (se)
 556                         printf("%s", se->s_name);
 557                 else
 558                         printf("%d", port);
 559         }
 560 }
 561
 562 static struct _s_x _port_name[] = {
 563         {"dst-port",    O_IP_DSTPORT},
 564         {"src-port",    O_IP_SRCPORT},
 565         {"ipid",        O_IPID},
 566         {"iplen",       O_IPLEN},
 567         {"ipttl",       O_IPTTL},
 568         {"mac-type",    O_MAC_TYPE},
 569         {"tcpdatalen",  O_TCPDATALEN},
 570         {"tcpwin",      O_TCPWIN},
 571         {"tagged",      O_TAGGED},
 572         {NULL,          0}
 573 };
 574
 575 /*
 576  * Print the values in a list 16-bit items of the types above.
 577  * XXX todo: add support for mask.
 578  */
 579 static void
 580 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 581 {
 582         uint16_t *p = cmd->ports;
 583         int i;
 584         char const *sep;
 585
 586         if (opcode != 0) {
 587                 sep = match_value(_port_name, opcode);
 588                 if (sep == NULL)
 589                         sep = "???";
 590                 printf (" %s", sep);
 591         }
 592         sep = " ";
 593         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 594                 printf("%s", sep);
 595                 print_port(proto, p[0]);
 596                 if (p[0] != p[1]) {
 597                         printf("-");
 598                         print_port(proto, p[1]);
 599                 }
 600                 sep = ",";
 601         }
 602 }
 603
 604 /*
 605  * Like strtol, but also translates service names into port numbers
 606  * for some protocols.
 607  * In particular:
 608  *      proto == -1 disables the protocol check;
 609  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 610  *      proto == <some value in /etc/protocols> matches the values there.
 611  * Returns *end == s in case the parameter is not found.
 612  */
 613 static int
 614 strtoport(char *s, char **end, int base, int proto)
 615 {
 616         char *p, *buf;
 617         char *s1;
 618         int i;
 619
 620         *end = s;               /* default - not found */
 621         if (*s == '\0')
 622                 return 0;       /* not found */
 623
 624         if (isdigit(*s))
 625                 return strtol(s, end, base);
 626
 627         /*
 628          * find separator. '\\' escapes the next char.
 629          */
 630         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 631                 if (*s1 == '\\' && s1[1] != '\0')
 632                         s1++;
 633
 634         buf = safe_calloc(s1 - s + 1, 1);
 635
 636         /*
 637          * copy into a buffer skipping backslashes
 638          */
 639         for (p = s, i = 0; p != s1 ; p++)
 640                 if (*p != '\\')
 641                         buf[i++] = *p;
 642         buf[i++] = '\0';
 643
 644         if (proto == IPPROTO_ETHERTYPE) {
 645                 i = match_token(ether_types, buf);
 646                 free(buf);
 647                 if (i != -1) {  /* found */
 648                         *end = s1;
 649                         return i;
 650                 }
 651         } else {
 652                 struct protoent *pe = NULL;
 653                 struct servent *se;
 654
 655                 if (proto != 0)
 656                         pe = getprotobynumber(proto);
 657                 setservent(1);
 658                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 659                 free(buf);
 660                 if (se != NULL) {
 661                         *end = s1;
 662                         return ntohs(se->s_port);
 663                 }
 664         }
 665         return 0;       /* not found */
 666 }
 667
 668 /*
 669  * Fill the body of the command with the list of port ranges.
 670  */
 671 static int
 672 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen)
 673 {
 674         uint16_t a, b, *p = cmd->ports;
 675         int i = 0;
 676         char *s = av;
 677
 678         while (*s) {
 679                 a = strtoport(av, &s, 0, proto);
 680                 if (s == av)                    /* empty or invalid argument */
 681                         return (0);
 682
 683                 CHECK_LENGTH(cblen, i + 2);
 684
 685                 switch (*s) {
 686                 case '-':                       /* a range */
 687                         av = s + 1;
 688                         b = strtoport(av, &s, 0, proto);
 689                         /* Reject expressions like '1-abc' or '1-2-3'. */
 690                         if (s == av || (*s != ',' && *s != '\0'))
 691                                 return (0);
 692                         p[0] = a;
 693                         p[1] = b;
 694                         break;
 695                 case ',':                       /* comma separated list */
 696                 case '\0':
 697                         p[0] = p[1] = a;
 698                         break;
 699                 default:
 700                         warnx("port list: invalid separator <%c> in <%s>",
 701                                 *s, av);
 702                         return (0);
 703                 }
 704
 705                 i++;
 706                 p += 2;
 707                 av = s + 1;
 708         }
 709         if (i > 0) {
 710                 if (i + 1 > F_LEN_MASK)
 711                         errx(EX_DATAERR, "too many ports/ranges\n");
 712                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 713         }
 714         return (i);
 715 }
 716
 717 static struct _s_x icmpcodes[] = {
 718       { "net",                  ICMP_UNREACH_NET },
 719       { "host",                 ICMP_UNREACH_HOST },
 720       { "protocol",             ICMP_UNREACH_PROTOCOL },
 721       { "port",                 ICMP_UNREACH_PORT },
 722       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 723       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 724       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 725       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 726       { "isolated",             ICMP_UNREACH_ISOLATED },
 727       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 728       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 729       { "tosnet",               ICMP_UNREACH_TOSNET },
 730       { "toshost",              ICMP_UNREACH_TOSHOST },
 731       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 732       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 733       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 734       { NULL, 0 }
 735 };
 736
 737 static void
 738 fill_reject_code(u_short *codep, char *str)
 739 {
 740         int val;
 741         char *s;
 742
 743         val = strtoul(str, &s, 0);
 744         if (s == str || *s != '\0' || val >= 0x100)
 745                 val = match_token(icmpcodes, str);
 746         if (val < 0)
 747                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 748         *codep = val;
 749         return;
 750 }
 751
 752 static void
 753 print_reject_code(uint16_t code)
 754 {
 755         char const *s = match_value(icmpcodes, code);
 756
 757         if (s != NULL)
 758                 printf("unreach %s", s);
 759         else
 760                 printf("unreach %u", code);
 761 }
 762
 763 /*
 764  * Returns the number of bits set (from left) in a contiguous bitmask,
 765  * or -1 if the mask is not contiguous.
 766  * XXX this needs a proper fix.
 767  * This effectively works on masks in big-endian (network) format.
 768  * when compiled on little endian architectures.
 769  *
 770  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 771  * the first bit on the wire is bit 0 of the first byte.
 772  * len is the max length in bits.
 773  */
 774 int
 775 contigmask(uint8_t *p, int len)
 776 {
 777         int i, n;
 778
 779         for (i=0; i<len ; i++)
 780                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 781                         break;
 782         for (n=i+1; n < len; n++)
 783                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 784                         return -1; /* mask not contiguous */
 785         return i;
 786 }
 787
 788 /*
 789  * print flags set/clear in the two bitmasks passed as parameters.
 790  * There is a specialized check for f_tcpflags.
 791  */
 792 static void
 793 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 794 {
 795         char const *comma = "";
 796         int i;
 797         uint8_t set = cmd->arg1 & 0xff;
 798         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 799
 800         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 801                 printf(" setup");
 802                 return;
 803         }
 804
 805         printf(" %s ", name);
 806         for (i=0; list[i].x != 0; i++) {
 807                 if (set & list[i].x) {
 808                         set &= ~list[i].x;
 809                         printf("%s%s", comma, list[i].s);
 810                         comma = ",";
 811                 }
 812                 if (clear & list[i].x) {
 813                         clear &= ~list[i].x;
 814                         printf("%s!%s", comma, list[i].s);
 815                         comma = ",";
 816                 }
 817         }
 818 }
 819
 820 /*
 821  * Print the ip address contained in a command.
 822  */
 823 static void
 824 print_ip(ipfw_insn_ip *cmd, char const *s)
 825 {
 826         struct hostent *he = NULL;
 827         uint32_t len = F_LEN((ipfw_insn *)cmd);
 828         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 829
 830         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 831                 uint32_t d = a[1];
 832                 const char *arg = "<invalid>";
 833
 834                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 835                         arg = match_value(rule_options, lookup_key[d]);
 836                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 837                         arg, cmd->o.arg1);
 838                 return;
 839         }
 840         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 841
 842         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 843                 printf("me");
 844                 return;
 845         }
 846         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 847             cmd->o.opcode == O_IP_DST_LOOKUP) {
 848                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 849                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 850                         printf(",%u", *a);
 851                 printf(")");
 852                 return;
 853         }
 854         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 855                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 856                 int i, j;
 857                 char comma = '{';
 858
 859                 x = cmd->o.arg1 - 1;
 860                 x = htonl( ~x );
 861                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 862                 printf("%s/%d", inet_ntoa(cmd->addr),
 863                         contigmask((uint8_t *)&x, 32));
 864                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 865                 x &= 0xff; /* base */
 866                 /*
 867                  * Print bits and ranges.
 868                  * Locate first bit set (i), then locate first bit unset (j).
 869                  * If we have 3+ consecutive bits set, then print them as a
 870                  * range, otherwise only print the initial bit and rescan.
 871                  */
 872                 for (i=0; i < cmd->o.arg1; i++)
 873                         if (map[i/32] & (1<<(i & 31))) {
 874                                 for (j=i+1; j < cmd->o.arg1; j++)
 875                                         if (!(map[ j/32] & (1<<(j & 31))))
 876                                                 break;
 877                                 printf("%c%d", comma, i+x);
 878                                 if (j>i+2) { /* range has at least 3 elements */
 879                                         printf("-%d", j-1+x);
 880                                         i = j-1;
 881                                 }
 882                                 comma = ',';
 883                         }
 884                 printf("}");
 885                 return;
 886         }
 887         /*
 888          * len == 2 indicates a single IP, whereas lists of 1 or more
 889          * addr/mask pairs have len = (2n+1). We convert len to n so we
 890          * use that to count the number of entries.
 891          */
 892     for (len = len / 2; len > 0; len--, a += 2) {
 893         int mb =        /* mask length */
 894             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 895                 32 : contigmask((uint8_t *)&(a[1]), 32);
 896         if (mb == 32 && co.do_resolv)
 897                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 898         if (he != NULL)         /* resolved to name */
 899                 printf("%s", he->h_name);
 900         else if (mb == 0)       /* any */
 901                 printf("any");
 902         else {          /* numeric IP followed by some kind of mask */
 903                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 904                 if (mb < 0)
 905                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 906                 else if (mb < 32)
 907                         printf("/%d", mb);
 908         }
 909         if (len > 1)
 910                 printf(",");
 911     }
 912 }
 913
 914 /*
 915  * prints a MAC address/mask pair
 916  */
 917 static void
 918 print_mac(uint8_t *addr, uint8_t *mask)
 919 {
 920         int l = contigmask(mask, 48);
 921
 922         if (l == 0)
 923                 printf(" any");
 924         else {
 925                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 926                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 927                 if (l == -1)
 928                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 929                             mask[0], mask[1], mask[2],
 930                             mask[3], mask[4], mask[5]);
 931                 else if (l < 48)
 932                         printf("/%d", l);
 933         }
 934 }
 935
 936 static void
 937 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 938 {
 939         uint8_t type;
 940
 941         cmd->d[0] = 0;
 942         while (*av) {
 943                 if (*av == ',')
 944                         av++;
 945
 946                 type = strtoul(av, &av, 0);
 947
 948                 if (*av != ',' && *av != '\0')
 949                         errx(EX_DATAERR, "invalid ICMP type");
 950
 951                 if (type > 31)
 952                         errx(EX_DATAERR, "ICMP type out of range");
 953
 954                 cmd->d[0] |= 1 << type;
 955         }
 956         cmd->o.opcode = O_ICMPTYPE;
 957         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 958 }
 959
 960 static void
 961 print_icmptypes(ipfw_insn_u32 *cmd)
 962 {
 963         int i;
 964         char sep= ' ';
 965
 966         printf(" icmptypes");
 967         for (i = 0; i < 32; i++) {
 968                 if ( (cmd->d[0] & (1 << (i))) == 0)
 969                         continue;
 970                 printf("%c%d", sep, i);
 971                 sep = ',';
 972         }
 973 }
 974
 975 /*
 976  * show_ipfw() prints the body of an ipfw rule.
 977  * Because the standard rule has at least proto src_ip dst_ip, we use
 978  * a helper function to produce these entries if not provided explicitly.
 979  * The first argument is the list of fields we have, the second is
 980  * the list of fields we want to be printed.
 981  *
 982  * Special cases if we have provided a MAC header:
 983  *   + if the rule does not contain IP addresses/ports, do not print them;
 984  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 985  *
 986  * Once we have 'have_options', IP header fields are printed as options.
 987  */
 988 #define HAVE_PROTO      0x0001
 989 #define HAVE_SRCIP      0x0002
 990 #define HAVE_DSTIP      0x0004
 991 #define HAVE_PROTO4     0x0008
 992 #define HAVE_PROTO6     0x0010
 993 #define HAVE_IP         0x0100
 994 #define HAVE_OPTIONS    0x8000
 995
 996 static void
 997 show_prerequisites(int *flags, int want, int cmd __unused)
 998 {
 999         if (co.comment_only)
1000                 return;
1001         if ( (*flags & HAVE_IP) == HAVE_IP)
1002                 *flags |= HAVE_OPTIONS;
1003
1004         if ( !(*flags & HAVE_OPTIONS)) {
1005                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
1006                         if ( (*flags & HAVE_PROTO4))
1007                                 printf(" ip4");
1008                         else if ( (*flags & HAVE_PROTO6))
1009                                 printf(" ip6");
1010                         else
1011                                 printf(" ip");
1012                 }
1013                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
1014                         printf(" from any");
1015                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
1016                         printf(" to any");
1017         }
1018         *flags |= want;
1019 }
1020
1021 static void
1022 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
1023 {
1024         static int twidth = 0;
1025         int l;
1026         ipfw_insn *cmd, *tagptr = NULL;
1027         const char *comment = NULL;     /* ptr to comment if we have one */
1028         int proto = 0;          /* default */
1029         int flags = 0;  /* prerequisites */
1030         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
1031         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
1032         int or_block = 0;       /* we are in an or block */
1033         uint32_t set_disable;
1034
1035         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
1036
1037         if (set_disable & (1 << rule->set)) { /* disabled */
1038                 if (!co.show_sets)
1039                         return;
1040                 else
1041                         printf("# DISABLED ");
1042         }
1043         printf("%05u ", rule->rulenum);
1044
1045         if (pcwidth > 0 || bcwidth > 0) {
1046                 pr_u64(&rule->pcnt, pcwidth);
1047                 pr_u64(&rule->bcnt, bcwidth);
1048         }
1049
1050         if (co.do_time == 2)
1051                 printf("%10u ", rule->timestamp);
1052         else if (co.do_time == 1) {
1053                 char timestr[30];
1054                 time_t t = (time_t)0;
1055
1056                 if (twidth == 0) {
1057                         strcpy(timestr, ctime(&t));
1058                         *strchr(timestr, '\n') = '\0';
1059                         twidth = strlen(timestr);
1060                 }
1061                 if (rule->timestamp) {
1062                         t = _long_to_time(rule->timestamp);
1063
1064                         strcpy(timestr, ctime(&t));
1065                         *strchr(timestr, '\n') = '\0';
1066                         printf("%s ", timestr);
1067                 } else {
1068                         printf("%*s", twidth, " ");
1069                 }
1070         }
1071
1072         if (co.show_sets)
1073                 printf("set %d ", rule->set);
1074
1075         /*
1076          * print the optional "match probability"
1077          */
1078         if (rule->cmd_len > 0) {
1079                 cmd = rule->cmd ;
1080                 if (cmd->opcode == O_PROB) {
1081                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1082                         double d = 1.0 * p->d[0];
1083
1084                         d = (d / 0x7fffffff);
1085                         printf("prob %f ", d);
1086                 }
1087         }
1088
1089         /*
1090          * first print actions
1091          */
1092         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1093                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1094                 switch(cmd->opcode) {
1095                 case O_CHECK_STATE:
1096                         printf("check-state");
1097                         /* avoid printing anything else */
1098                         flags = HAVE_PROTO | HAVE_SRCIP |
1099                                 HAVE_DSTIP | HAVE_IP;
1100                         break;
1101
1102                 case O_ACCEPT:
1103                         printf("allow");
1104                         break;
1105
1106                 case O_COUNT:
1107                         printf("count");
1108                         break;
1109
1110                 case O_DENY:
1111                         printf("deny");
1112                         break;
1113
1114                 case O_REJECT:
1115                         if (cmd->arg1 == ICMP_REJECT_RST)
1116                                 printf("reset");
1117                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1118                                 printf("reject");
1119                         else
1120                                 print_reject_code(cmd->arg1);
1121                         break;
1122
1123                 case O_UNREACH6:
1124                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1125                                 printf("reset6");
1126                         else
1127                                 print_unreach6_code(cmd->arg1);
1128                         break;
1129
1130                 case O_SKIPTO:
1131                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1132                         break;
1133
1134                 case O_PIPE:
1135                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1136                         break;
1137
1138                 case O_QUEUE:
1139                         PRINT_UINT_ARG("queue ", cmd->arg1);
1140                         break;
1141
1142                 case O_DIVERT:
1143                         PRINT_UINT_ARG("divert ", cmd->arg1);
1144                         break;
1145
1146                 case O_TEE:
1147                         PRINT_UINT_ARG("tee ", cmd->arg1);
1148                         break;
1149
1150                 case O_NETGRAPH:
1151                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1152                         break;
1153
1154                 case O_NGTEE:
1155                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1156                         break;
1157
1158                 case O_FORWARD_IP:
1159                     {
1160                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1161
1162                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1163                                 printf("fwd tablearg");
1164                         } else {
1165                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1166                         }
1167                         if (s->sa.sin_port)
1168                                 printf(",%d", s->sa.sin_port);
1169                     }
1170                         break;
1171
1172                 case O_FORWARD_IP6:
1173                     {
1174                         char buf[4 + INET6_ADDRSTRLEN + 1];
1175                         ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd;
1176
1177                         printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr,
1178                             buf, sizeof(buf)));
1179                         if (s->sa.sin6_port)
1180                                 printf(",%d", s->sa.sin6_port);
1181                     }
1182                         break;
1183
1184                 case O_LOG: /* O_LOG is printed last */
1185                         logptr = (ipfw_insn_log *)cmd;
1186                         break;
1187
1188                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1189                         altqptr = (ipfw_insn_altq *)cmd;
1190                         break;
1191
1192                 case O_TAG:
1193                         tagptr = cmd;
1194                         break;
1195
1196                 case O_NAT:
1197                         if (cmd->arg1 != 0)
1198                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1199                         else
1200                                 printf("nat global");
1201                         break;
1202
1203                 case O_SETFIB:
1204                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1205                         break;
1206
1207                 case O_REASS:
1208                         printf("reass");
1209                         break;
1210
1211                 case O_CALLRETURN:
1212                         if (cmd->len & F_NOT)
1213                                 printf("return");
1214                         else
1215                                 PRINT_UINT_ARG("call ", cmd->arg1);
1216                         break;
1217
1218                 default:
1219                         printf("** unrecognized action %d len %d ",
1220                                 cmd->opcode, cmd->len);
1221                 }
1222         }
1223         if (logptr) {
1224                 if (logptr->max_log > 0)
1225                         printf(" log logamount %d", logptr->max_log);
1226                 else
1227                         printf(" log");
1228         }
1229 #ifndef NO_ALTQ
1230         if (altqptr) {
1231                 print_altq_cmd(altqptr);
1232         }
1233 #endif
1234         if (tagptr) {
1235                 if (tagptr->len & F_NOT)
1236                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1237                 else
1238                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1239         }
1240
1241         /*
1242          * then print the body.
1243          */
1244         for (l = rule->act_ofs, cmd = rule->cmd ;
1245                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1246                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1247                         continue;
1248                 if (cmd->opcode == O_IP4) {
1249                         flags |= HAVE_PROTO4;
1250                         break;
1251                 } else if (cmd->opcode == O_IP6) {
1252                         flags |= HAVE_PROTO6;
1253                         break;
1254                 }
1255         }
1256         if (rule->_pad & 1) {   /* empty rules before options */
1257                 if (!co.do_compact) {
1258                         show_prerequisites(&flags, HAVE_PROTO, 0);
1259                         printf(" from any to any");
1260                 }
1261                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1262                          HAVE_SRCIP | HAVE_DSTIP;
1263         }
1264
1265         if (co.comment_only)
1266                 comment = "...";
1267
1268         for (l = rule->act_ofs, cmd = rule->cmd ;
1269                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1270                 /* useful alias */
1271                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1272
1273                 if (co.comment_only) {
1274                         if (cmd->opcode != O_NOP)
1275                                 continue;
1276                         printf(" // %s\n", (char *)(cmd + 1));
1277                         return;
1278                 }
1279
1280                 show_prerequisites(&flags, 0, cmd->opcode);
1281
1282                 switch(cmd->opcode) {
1283                 case O_PROB:
1284                         break;  /* done already */
1285
1286                 case O_PROBE_STATE:
1287                         break; /* no need to print anything here */
1288
1289                 case O_IP_SRC:
1290                 case O_IP_SRC_LOOKUP:
1291                 case O_IP_SRC_MASK:
1292                 case O_IP_SRC_ME:
1293                 case O_IP_SRC_SET:
1294                         show_prerequisites(&flags, HAVE_PROTO, 0);
1295                         if (!(flags & HAVE_SRCIP))
1296                                 printf(" from");
1297                         if ((cmd->len & F_OR) && !or_block)
1298                                 printf(" {");
1299                         print_ip((ipfw_insn_ip *)cmd,
1300                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1301                         flags |= HAVE_SRCIP;
1302                         break;
1303
1304                 case O_IP_DST:
1305                 case O_IP_DST_LOOKUP:
1306                 case O_IP_DST_MASK:
1307                 case O_IP_DST_ME:
1308                 case O_IP_DST_SET:
1309                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1310                         if (!(flags & HAVE_DSTIP))
1311                                 printf(" to");
1312                         if ((cmd->len & F_OR) && !or_block)
1313                                 printf(" {");
1314                         print_ip((ipfw_insn_ip *)cmd,
1315                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1316                         flags |= HAVE_DSTIP;
1317                         break;
1318
1319                 case O_IP6_SRC:
1320                 case O_IP6_SRC_MASK:
1321                 case O_IP6_SRC_ME:
1322                         show_prerequisites(&flags, HAVE_PROTO, 0);
1323                         if (!(flags & HAVE_SRCIP))
1324                                 printf(" from");
1325                         if ((cmd->len & F_OR) && !or_block)
1326                                 printf(" {");
1327                         print_ip6((ipfw_insn_ip6 *)cmd,
1328                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1329                         flags |= HAVE_SRCIP | HAVE_PROTO;
1330                         break;
1331
1332                 case O_IP6_DST:
1333                 case O_IP6_DST_MASK:
1334                 case O_IP6_DST_ME:
1335                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1336                         if (!(flags & HAVE_DSTIP))
1337                                 printf(" to");
1338                         if ((cmd->len & F_OR) && !or_block)
1339                                 printf(" {");
1340                         print_ip6((ipfw_insn_ip6 *)cmd,
1341                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1342                         flags |= HAVE_DSTIP;
1343                         break;
1344
1345                 case O_FLOW6ID:
1346                 print_flow6id( (ipfw_insn_u32 *) cmd );
1347                 flags |= HAVE_OPTIONS;
1348                 break;
1349
1350                 case O_IP_DSTPORT:
1351                         show_prerequisites(&flags,
1352                                 HAVE_PROTO | HAVE_SRCIP |
1353                                 HAVE_DSTIP | HAVE_IP, 0);
1354                 case O_IP_SRCPORT:
1355                         if (flags & HAVE_DSTIP)
1356                                 flags |= HAVE_IP;
1357                         show_prerequisites(&flags,
1358                                 HAVE_PROTO | HAVE_SRCIP, 0);
1359                         if ((cmd->len & F_OR) && !or_block)
1360                                 printf(" {");
1361                         if (cmd->len & F_NOT)
1362                                 printf(" not");
1363                         print_newports((ipfw_insn_u16 *)cmd, proto,
1364                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1365                         break;
1366
1367                 case O_PROTO: {
1368                         struct protoent *pe = NULL;
1369
1370                         if ((cmd->len & F_OR) && !or_block)
1371                                 printf(" {");
1372                         if (cmd->len & F_NOT)
1373                                 printf(" not");
1374                         proto = cmd->arg1;
1375                         pe = getprotobynumber(cmd->arg1);
1376                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1377                             !(flags & HAVE_PROTO))
1378                                 show_prerequisites(&flags,
1379                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1380                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1381                         if (flags & HAVE_OPTIONS)
1382                                 printf(" proto");
1383                         if (pe)
1384                                 printf(" %s", pe->p_name);
1385                         else
1386                                 printf(" %u", cmd->arg1);
1387                         }
1388                         flags |= HAVE_PROTO;
1389                         break;
1390
1391                 default: /*options ... */
1392                         if (!(cmd->len & (F_OR|F_NOT)))
1393                                 if (((cmd->opcode == O_IP6) &&
1394                                     (flags & HAVE_PROTO6)) ||
1395                                     ((cmd->opcode == O_IP4) &&
1396                                     (flags & HAVE_PROTO4)))
1397                                         break;
1398                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1399                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1400                         if ((cmd->len & F_OR) && !or_block)
1401                                 printf(" {");
1402                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1403                                 printf(" not");
1404                         switch(cmd->opcode) {
1405                         case O_MACADDR2: {
1406                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1407
1408                                 printf(" MAC");
1409                                 print_mac(m->addr, m->mask);
1410                                 print_mac(m->addr + 6, m->mask + 6);
1411                                 }
1412                                 break;
1413
1414                         case O_MAC_TYPE:
1415                                 print_newports((ipfw_insn_u16 *)cmd,
1416                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1417                                 break;
1418
1419
1420                         case O_FRAG:
1421                                 printf(" frag");
1422                                 break;
1423
1424                         case O_FIB:
1425                                 printf(" fib %u", cmd->arg1 );
1426                                 break;
1427                         case O_SOCKARG:
1428                                 printf(" sockarg");
1429                                 break;
1430
1431                         case O_IN:
1432                                 printf(cmd->len & F_NOT ? " out" : " in");
1433                                 break;
1434
1435                         case O_DIVERTED:
1436                                 switch (cmd->arg1) {
1437                                 case 3:
1438                                         printf(" diverted");
1439                                         break;
1440                                 case 1:
1441                                         printf(" diverted-loopback");
1442                                         break;
1443                                 case 2:
1444                                         printf(" diverted-output");
1445                                         break;
1446                                 default:
1447                                         printf(" diverted-?<%u>", cmd->arg1);
1448                                         break;
1449                                 }
1450                                 break;
1451
1452                         case O_LAYER2:
1453                                 printf(" layer2");
1454                                 break;
1455                         case O_XMIT:
1456                         case O_RECV:
1457                         case O_VIA:
1458                             {
1459                                 char const *s;
1460                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1461
1462                                 if (cmd->opcode == O_XMIT)
1463                                         s = "xmit";
1464                                 else if (cmd->opcode == O_RECV)
1465                                         s = "recv";
1466                                 else /* if (cmd->opcode == O_VIA) */
1467                                         s = "via";
1468                                 if (cmdif->name[0] == '\0')
1469                                         printf(" %s %s", s,
1470                                             inet_ntoa(cmdif->p.ip));
1471                                 else if (cmdif->name[0] == '\1') /* interface table */
1472                                         printf(" %s table(%d)", s, cmdif->p.glob);
1473                                 else
1474                                         printf(" %s %s", s, cmdif->name);
1475
1476                                 break;
1477                             }
1478                         case O_IPID:
1479                                 if (F_LEN(cmd) == 1)
1480                                     printf(" ipid %u", cmd->arg1 );
1481                                 else
1482                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1483                                         O_IPID);
1484                                 break;
1485
1486                         case O_IPTTL:
1487                                 if (F_LEN(cmd) == 1)
1488                                     printf(" ipttl %u", cmd->arg1 );
1489                                 else
1490                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1491                                         O_IPTTL);
1492                                 break;
1493
1494                         case O_IPVER:
1495                                 printf(" ipver %u", cmd->arg1 );
1496                                 break;
1497
1498                         case O_IPPRECEDENCE:
1499                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1500                                 break;
1501
1502                         case O_IPLEN:
1503                                 if (F_LEN(cmd) == 1)
1504                                     printf(" iplen %u", cmd->arg1 );
1505                                 else
1506                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1507                                         O_IPLEN);
1508                                 break;
1509
1510                         case O_IPOPT:
1511                                 print_flags("ipoptions", cmd, f_ipopts);
1512                                 break;
1513
1514                         case O_IPTOS:
1515                                 print_flags("iptos", cmd, f_iptos);
1516                                 break;
1517
1518                         case O_ICMPTYPE:
1519                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1520                                 break;
1521
1522                         case O_ESTAB:
1523                                 printf(" established");
1524                                 break;
1525
1526                         case O_TCPDATALEN:
1527                                 if (F_LEN(cmd) == 1)
1528                                     printf(" tcpdatalen %u", cmd->arg1 );
1529                                 else
1530                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1531                                         O_TCPDATALEN);
1532                                 break;
1533
1534                         case O_TCPFLAGS:
1535                                 print_flags("tcpflags", cmd, f_tcpflags);
1536                                 break;
1537
1538                         case O_TCPOPTS:
1539                                 print_flags("tcpoptions", cmd, f_tcpopts);
1540                                 break;
1541
1542                         case O_TCPWIN:
1543                                 if (F_LEN(cmd) == 1)
1544                                     printf(" tcpwin %u", cmd->arg1);
1545                                 else
1546                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1547                                         O_TCPWIN);
1548                                 break;
1549
1550                         case O_TCPACK:
1551                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1552                                 break;
1553
1554                         case O_TCPSEQ:
1555                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1556                                 break;
1557
1558                         case O_UID:
1559                             {
1560                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1561
1562                                 if (pwd)
1563                                         printf(" uid %s", pwd->pw_name);
1564                                 else
1565                                         printf(" uid %u", cmd32->d[0]);
1566                             }
1567                                 break;
1568
1569                         case O_GID:
1570                             {
1571                                 struct group *grp = getgrgid(cmd32->d[0]);
1572
1573                                 if (grp)
1574                                         printf(" gid %s", grp->gr_name);
1575                                 else
1576                                         printf(" gid %u", cmd32->d[0]);
1577                             }
1578                                 break;
1579
1580                         case O_JAIL:
1581                                 printf(" jail %d", cmd32->d[0]);
1582                                 break;
1583
1584                         case O_VERREVPATH:
1585                                 printf(" verrevpath");
1586                                 break;
1587
1588                         case O_VERSRCREACH:
1589                                 printf(" versrcreach");
1590                                 break;
1591
1592                         case O_ANTISPOOF:
1593                                 printf(" antispoof");
1594                                 break;
1595
1596                         case O_IPSEC:
1597                                 printf(" ipsec");
1598                                 break;
1599
1600                         case O_NOP:
1601                                 comment = (char *)(cmd + 1);
1602                                 break;
1603
1604                         case O_KEEP_STATE:
1605                                 printf(" keep-state");
1606                                 break;
1607
1608                         case O_LIMIT: {
1609                                 struct _s_x *p = limit_masks;
1610                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1611                                 uint8_t x = c->limit_mask;
1612                                 char const *comma = " ";
1613
1614                                 printf(" limit");
1615                                 for (; p->x != 0 ; p++)
1616                                         if ((x & p->x) == p->x) {
1617                                                 x &= ~p->x;
1618                                                 printf("%s%s", comma, p->s);
1619                                                 comma = ",";
1620                                         }
1621                                 PRINT_UINT_ARG(" ", c->conn_limit);
1622                                 break;
1623                         }
1624
1625                         case O_IP6:
1626                                 printf(" ip6");
1627                                 break;
1628
1629                         case O_IP4:
1630                                 printf(" ip4");
1631                                 break;
1632
1633                         case O_ICMP6TYPE:
1634                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1635                                 break;
1636
1637                         case O_EXT_HDR:
1638                                 print_ext6hdr( (ipfw_insn *) cmd );
1639                                 break;
1640
1641                         case O_TAGGED:
1642                                 if (F_LEN(cmd) == 1)
1643                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1644                                 else
1645                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1646                                             O_TAGGED);
1647                                 break;
1648
1649                         default:
1650                                 printf(" [opcode %d len %d]",
1651                                     cmd->opcode, cmd->len);
1652                         }
1653                 }
1654                 if (cmd->len & F_OR) {
1655                         printf(" or");
1656                         or_block = 1;
1657                 } else if (or_block) {
1658                         printf(" }");
1659                         or_block = 0;
1660                 }
1661         }
1662         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1663                                               | HAVE_IP, 0);
1664         if (comment)
1665                 printf(" // %s", comment);
1666         printf("\n");
1667 }
1668
1669 static void
1670 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1671 {
1672         struct protoent *pe;
1673         struct in_addr a;
1674         uint16_t rulenum;
1675         char buf[INET6_ADDRSTRLEN];
1676
1677         if (!co.do_expired) {
1678                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1679                         return;
1680         }
1681         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1682         printf("%05d", rulenum);
1683         if (pcwidth > 0 || bcwidth > 0) {
1684                 printf(" ");
1685                 pr_u64(&d->pcnt, pcwidth);
1686                 pr_u64(&d->bcnt, bcwidth);
1687                 printf("(%ds)", d->expire);
1688         }
1689         switch (d->dyn_type) {
1690         case O_LIMIT_PARENT:
1691                 printf(" PARENT %d", d->count);
1692                 break;
1693         case O_LIMIT:
1694                 printf(" LIMIT");
1695                 break;
1696         case O_KEEP_STATE: /* bidir, no mask */
1697                 printf(" STATE");
1698                 break;
1699         }
1700
1701         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1702                 printf(" %s", pe->p_name);
1703         else
1704                 printf(" proto %u", d->id.proto);
1705
1706         if (d->id.addr_type == 4) {
1707                 a.s_addr = htonl(d->id.src_ip);
1708                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1709
1710                 a.s_addr = htonl(d->id.dst_ip);
1711                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1712         } else if (d->id.addr_type == 6) {
1713                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1714                     sizeof(buf)), d->id.src_port);
1715                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1716                     sizeof(buf)), d->id.dst_port);
1717         } else
1718                 printf(" UNKNOWN <-> UNKNOWN\n");
1719
1720         printf("\n");
1721 }
1722
1723 /*
1724  * This one handles all set-related commands
1725  *      ipfw set { show | enable | disable }
1726  *      ipfw set swap X Y
1727  *      ipfw set move X to Y
1728  *      ipfw set move rule X to Y
1729  */
1730 void
1731 ipfw_sets_handler(char *av[])
1732 {
1733         uint32_t set_disable, masks[2];
1734         int i, nbytes;
1735         uint16_t rulenum;
1736         uint8_t cmd, new_set;
1737
1738         av++;
1739
1740         if (av[0] == NULL)
1741                 errx(EX_USAGE, "set needs command");
1742         if (_substrcmp(*av, "show") == 0) {
1743                 void *data = NULL;
1744                 char const *msg;
1745                 int nalloc;
1746
1747                 nalloc = nbytes = sizeof(struct ip_fw);
1748                 while (nbytes >= nalloc) {
1749                         if (data)
1750                                 free(data);
1751                         nalloc = nalloc * 2 + 200;
1752                         nbytes = nalloc;
1753                         data = safe_calloc(1, nbytes);
1754                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1755                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1756                 }
1757
1758                 bcopy(&((struct ip_fw *)data)->next_rule,
1759                         &set_disable, sizeof(set_disable));
1760
1761                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1762                         if ((set_disable & (1<<i))) {
1763                                 printf("%s %d", msg, i);
1764                                 msg = "";
1765                         }
1766                 msg = (set_disable) ? " enable" : "enable";
1767                 for (i = 0; i < RESVD_SET; i++)
1768                         if (!(set_disable & (1<<i))) {
1769                                 printf("%s %d", msg, i);
1770                                 msg = "";
1771                         }
1772                 printf("\n");
1773         } else if (_substrcmp(*av, "swap") == 0) {
1774                 av++;
1775                 if ( av[0] == NULL || av[1] == NULL )
1776                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1777                 rulenum = atoi(av[0]);
1778                 new_set = atoi(av[1]);
1779                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1780                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1781                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1782                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1783                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1784                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1785         } else if (_substrcmp(*av, "move") == 0) {
1786                 av++;
1787                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1788                         cmd = 2;
1789                         av++;
1790                 } else
1791                         cmd = 3;
1792                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1793                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1794                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1795                 rulenum = atoi(av[0]);
1796                 new_set = atoi(av[2]);
1797                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1798                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1799                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1800                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1801                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1802                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1803                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1804         } else if (_substrcmp(*av, "disable") == 0 ||
1805                    _substrcmp(*av, "enable") == 0 ) {
1806                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1807
1808                 av++;
1809                 masks[0] = masks[1] = 0;
1810
1811                 while (av[0]) {
1812                         if (isdigit(**av)) {
1813                                 i = atoi(*av);
1814                                 if (i < 0 || i > RESVD_SET)
1815                                         errx(EX_DATAERR,
1816                                             "invalid set number %d\n", i);
1817                                 masks[which] |= (1<<i);
1818                         } else if (_substrcmp(*av, "disable") == 0)
1819                                 which = 0;
1820                         else if (_substrcmp(*av, "enable") == 0)
1821                                 which = 1;
1822                         else
1823                                 errx(EX_DATAERR,
1824                                         "invalid set command %s\n", *av);
1825                         av++;
1826                 }
1827                 if ( (masks[0] & masks[1]) != 0 )
1828                         errx(EX_DATAERR,
1829                             "cannot enable and disable the same set\n");
1830
1831                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1832                 if (i)
1833                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1834         } else
1835                 errx(EX_USAGE, "invalid set command %s\n", *av);
1836 }
1837
1838 void
1839 ipfw_sysctl_handler(char *av[], int which)
1840 {
1841         av++;
1842
1843         if (av[0] == NULL) {
1844                 warnx("missing keyword to enable/disable\n");
1845         } else if (_substrcmp(*av, "firewall") == 0) {
1846                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1847                     &which, sizeof(which));
1848                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1849                     &which, sizeof(which));
1850         } else if (_substrcmp(*av, "one_pass") == 0) {
1851                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1852                     &which, sizeof(which));
1853         } else if (_substrcmp(*av, "debug") == 0) {
1854                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1855                     &which, sizeof(which));
1856         } else if (_substrcmp(*av, "verbose") == 0) {
1857                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1858                     &which, sizeof(which));
1859         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1860                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1861                     &which, sizeof(which));
1862 #ifndef NO_ALTQ
1863         } else if (_substrcmp(*av, "altq") == 0) {
1864                 altq_set_enabled(which);
1865 #endif
1866         } else {
1867                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1868         }
1869 }
1870
1871 void
1872 ipfw_list(int ac, char *av[], int show_counters)
1873 {
1874         struct ip_fw *r;
1875         ipfw_dyn_rule *dynrules, *d;
1876
1877 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1878         char *lim;
1879         void *data = NULL;
1880         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1881         int exitval = EX_OK;
1882         int lac;
1883         char **lav;
1884         u_long rnum, last;
1885         char *endptr;
1886         int seen = 0;
1887         uint8_t set;
1888
1889         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1890         int nalloc = 1024;      /* start somewhere... */
1891
1892         last = 0;
1893
1894         if (co.test_only) {
1895                 fprintf(stderr, "Testing only, list disabled\n");
1896                 return;
1897         }
1898         if (co.do_pipe) {
1899                 dummynet_list(ac, av, show_counters);
1900                 return;
1901         }
1902
1903         ac--;
1904         av++;
1905
1906         /* get rules or pipes from kernel, resizing array as necessary */
1907         nbytes = nalloc;
1908
1909         while (nbytes >= nalloc) {
1910                 nalloc = nalloc * 2 + 200;
1911                 nbytes = nalloc;
1912                 data = safe_realloc(data, nbytes);
1913                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1914                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1915                                 co.do_pipe ? "DUMMYNET" : "FW");
1916         }
1917
1918         /*
1919          * Count static rules. They have variable size so we
1920          * need to scan the list to count them.
1921          */
1922         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1923                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1924                     ++nstat, r = NEXT(r) )
1925                 ; /* nothing */
1926
1927         /*
1928          * Count dynamic rules. This is easier as they have
1929          * fixed size.
1930          */
1931         r = NEXT(r);
1932         dynrules = (ipfw_dyn_rule *)r ;
1933         n = (char *)r - (char *)data;
1934         ndyn = (nbytes - n) / sizeof *dynrules;
1935
1936         /* if showing stats, figure out column widths ahead of time */
1937         bcwidth = pcwidth = 0;
1938         if (show_counters) {
1939                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1940                         /* skip rules from another set */
1941                         if (co.use_set && r->set != co.use_set - 1)
1942                                 continue;
1943
1944                         /* packet counter */
1945                         width = pr_u64(&r->pcnt, 0);
1946                         if (width > pcwidth)
1947                                 pcwidth = width;
1948
1949                         /* byte counter */
1950                         width = pr_u64(&r->bcnt, 0);
1951                         if (width > bcwidth)
1952                                 bcwidth = width;
1953                 }
1954         }
1955         if (co.do_dynamic && ndyn) {
1956                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1957                         if (co.use_set) {
1958                                 /* skip rules from another set */
1959                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1960                                       &set, sizeof(uint8_t));
1961                                 if (set != co.use_set - 1)
1962                                         continue;
1963                         }
1964                         width = pr_u64(&d->pcnt, 0);
1965                         if (width > pcwidth)
1966                                 pcwidth = width;
1967
1968                         width = pr_u64(&d->bcnt, 0);
1969                         if (width > bcwidth)
1970                                 bcwidth = width;
1971                 }
1972         }
1973         /* if no rule numbers were specified, list all rules */
1974         if (ac == 0) {
1975                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1976                         if (co.use_set && r->set != co.use_set - 1)
1977                                 continue;
1978                         show_ipfw(r, pcwidth, bcwidth);
1979                 }
1980
1981                 if (co.do_dynamic && ndyn) {
1982                         printf("## Dynamic rules (%d):\n", ndyn);
1983                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1984                                 if (co.use_set) {
1985                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1986                                               &set, sizeof(uint8_t));
1987                                         if (set != co.use_set - 1)
1988                                                 continue;
1989                                 }
1990                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1991                 }
1992                 }
1993                 goto done;
1994         }
1995
1996         /* display specific rules requested on command line */
1997
1998         for (lac = ac, lav = av; lac != 0; lac--) {
1999                 /* convert command line rule # */
2000                 last = rnum = strtoul(*lav++, &endptr, 10);
2001                 if (*endptr == '-')
2002                         last = strtoul(endptr+1, &endptr, 10);
2003                 if (*endptr) {
2004                         exitval = EX_USAGE;
2005                         warnx("invalid rule number: %s", *(lav - 1));
2006                         continue;
2007                 }
2008                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
2009                         if (r->rulenum > last)
2010                                 break;
2011                         if (co.use_set && r->set != co.use_set - 1)
2012                                 continue;
2013                         if (r->rulenum >= rnum && r->rulenum <= last) {
2014                                 show_ipfw(r, pcwidth, bcwidth);
2015                                 seen = 1;
2016                         }
2017                 }
2018                 if (!seen) {
2019                         /* give precedence to other error(s) */
2020                         if (exitval == EX_OK)
2021                                 exitval = EX_UNAVAILABLE;
2022                         warnx("rule %lu does not exist", rnum);
2023                 }
2024         }
2025
2026         if (co.do_dynamic && ndyn) {
2027                 printf("## Dynamic rules:\n");
2028                 for (lac = ac, lav = av; lac != 0; lac--) {
2029                         last = rnum = strtoul(*lav++, &endptr, 10);
2030                         if (*endptr == '-')
2031                                 last = strtoul(endptr+1, &endptr, 10);
2032                         if (*endptr)
2033                                 /* already warned */
2034                                 continue;
2035                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2036                                 uint16_t rulenum;
2037
2038                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
2039                                 if (rulenum > rnum)
2040                                         break;
2041                                 if (co.use_set) {
2042                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2043                                               &set, sizeof(uint8_t));
2044                                         if (set != co.use_set - 1)
2045                                                 continue;
2046                                 }
2047                                 if (r->rulenum >= rnum && r->rulenum <= last)
2048                                         show_dyn_ipfw(d, pcwidth, bcwidth);
2049                         }
2050                 }
2051         }
2052
2053         ac = 0;
2054
2055 done:
2056         free(data);
2057
2058         if (exitval != EX_OK)
2059                 exit(exitval);
2060 #undef NEXT
2061 }
2062
2063 static int
2064 lookup_host (char *host, struct in_addr *ipaddr)
2065 {
2066         struct hostent *he;
2067
2068         if (!inet_aton(host, ipaddr)) {
2069                 if ((he = gethostbyname(host)) == NULL)
2070                         return(-1);
2071                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
2072         }
2073         return(0);
2074 }
2075
2076 /*
2077  * fills the addr and mask fields in the instruction as appropriate from av.
2078  * Update length as appropriate.
2079  * The following formats are allowed:
2080  *      me      returns O_IP_*_ME
2081  *      1.2.3.4         single IP address
2082  *      1.2.3.4:5.6.7.8 address:mask
2083  *      1.2.3.4/24      address/mask
2084  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2085  * We can have multiple comma-separated address/mask entries.
2086  */
2087 static void
2088 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen)
2089 {
2090         int len = 0;
2091         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2092
2093         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2094
2095         if (_substrcmp(av, "any") == 0)
2096                 return;
2097
2098         if (_substrcmp(av, "me") == 0) {
2099                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2100                 return;
2101         }
2102
2103         if (strncmp(av, "table(", 6) == 0) {
2104                 char *p = strchr(av + 6, ',');
2105
2106                 if (p)
2107                         *p++ = '\0';
2108                 cmd->o.opcode = O_IP_DST_LOOKUP;
2109                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2110                 if (p) {
2111                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2112                         d[0] = strtoul(p, NULL, 0);
2113                 } else
2114                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2115                 return;
2116         }
2117
2118     while (av) {
2119         /*
2120          * After the address we can have '/' or ':' indicating a mask,
2121          * ',' indicating another address follows, '{' indicating a
2122          * set of addresses of unspecified size.
2123          */
2124         char *t = NULL, *p = strpbrk(av, "/:,{");
2125         int masklen;
2126         char md, nd = '\0';
2127
2128         CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len);
2129
2130         if (p) {
2131                 md = *p;
2132                 *p++ = '\0';
2133                 if ((t = strpbrk(p, ",{")) != NULL) {
2134                         nd = *t;
2135                         *t = '\0';
2136                 }
2137         } else
2138                 md = '\0';
2139
2140         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2141                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2142         switch (md) {
2143         case ':':
2144                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2145                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2146                 break;
2147         case '/':
2148                 masklen = atoi(p);
2149                 if (masklen == 0)
2150                         d[1] = htonl(0);        /* mask */
2151                 else if (masklen > 32)
2152                         errx(EX_DATAERR, "bad width ``%s''", p);
2153                 else
2154                         d[1] = htonl(~0 << (32 - masklen));
2155                 break;
2156         case '{':       /* no mask, assume /24 and put back the '{' */
2157                 d[1] = htonl(~0 << (32 - 24));
2158                 *(--p) = md;
2159                 break;
2160
2161         case ',':       /* single address plus continuation */
2162                 *(--p) = md;
2163                 /* FALLTHROUGH */
2164         case 0:         /* initialization value */
2165         default:
2166                 d[1] = htonl(~0);       /* force /32 */
2167                 break;
2168         }
2169         d[0] &= d[1];           /* mask base address with mask */
2170         if (t)
2171                 *t = nd;
2172         /* find next separator */
2173         if (p)
2174                 p = strpbrk(p, ",{");
2175         if (p && *p == '{') {
2176                 /*
2177                  * We have a set of addresses. They are stored as follows:
2178                  *   arg1       is the set size (powers of 2, 2..256)
2179                  *   addr       is the base address IN HOST FORMAT
2180                  *   mask..     is an array of arg1 bits (rounded up to
2181                  *              the next multiple of 32) with bits set
2182                  *              for each host in the map.
2183                  */
2184                 uint32_t *map = (uint32_t *)&cmd->mask;
2185                 int low, high;
2186                 int i = contigmask((uint8_t *)&(d[1]), 32);
2187
2188                 if (len > 0)
2189                         errx(EX_DATAERR, "address set cannot be in a list");
2190                 if (i < 24 || i > 31)
2191                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2192                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2193                 d[0] = ntohl(d[0]);             /* base addr in host format */
2194                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2195                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2196                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2197                         map[i] = 0;     /* clear map */
2198
2199                 av = p + 1;
2200                 low = d[0] & 0xff;
2201                 high = low + cmd->o.arg1 - 1;
2202                 /*
2203                  * Here, i stores the previous value when we specify a range
2204                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2205                  * have no previous value.
2206                  */
2207                 i = -1; /* previous value in a range */
2208                 while (isdigit(*av)) {
2209                         char *s;
2210                         int a = strtol(av, &s, 0);
2211
2212                         if (s == av) { /* no parameter */
2213                             if (*av != '}')
2214                                 errx(EX_DATAERR, "set not closed\n");
2215                             if (i != -1)
2216                                 errx(EX_DATAERR, "incomplete range %d-", i);
2217                             break;
2218                         }
2219                         if (a < low || a > high)
2220                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2221                                 a, low, high);
2222                         a -= low;
2223                         if (i == -1)    /* no previous in range */
2224                             i = a;
2225                         else {          /* check that range is valid */
2226                             if (i > a)
2227                                 errx(EX_DATAERR, "invalid range %d-%d",
2228                                         i+low, a+low);
2229                             if (*s == '-')
2230                                 errx(EX_DATAERR, "double '-' in range");
2231                         }
2232                         for (; i <= a; i++)
2233                             map[i/32] |= 1<<(i & 31);
2234                         i = -1;
2235                         if (*s == '-')
2236                             i = a;
2237                         else if (*s == '}')
2238                             break;
2239                         av = s+1;
2240                 }
2241                 return;
2242         }
2243         av = p;
2244         if (av)                 /* then *av must be a ',' */
2245                 av++;
2246
2247         /* Check this entry */
2248         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2249                 /*
2250                  * 'any' turns the entire list into a NOP.
2251                  * 'not any' never matches, so it is removed from the
2252                  * list unless it is the only item, in which case we
2253                  * report an error.
2254                  */
2255                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2256                         if (av == NULL && len == 0) /* only this entry */
2257                                 errx(EX_DATAERR, "not any never matches");
2258                 }
2259                 /* else do nothing and skip this entry */
2260                 return;
2261         }
2262         /* A single IP can be stored in an optimized format */
2263         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2264                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2265                 return;
2266         }
2267         len += 2;       /* two words... */
2268         d += 2;
2269     } /* end while */
2270     if (len + 1 > F_LEN_MASK)
2271         errx(EX_DATAERR, "address list too long");
2272     cmd->o.len |= len+1;
2273 }
2274
2275
2276 /* n2mask sets n bits of the mask */
2277 void
2278 n2mask(struct in6_addr *mask, int n)
2279 {
2280         static int      minimask[9] =
2281             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2282         u_char          *p;
2283
2284         memset(mask, 0, sizeof(struct in6_addr));
2285         p = (u_char *) mask;
2286         for (; n > 0; p++, n -= 8) {
2287                 if (n >= 8)
2288                         *p = 0xff;
2289                 else
2290                         *p = minimask[n];
2291         }
2292         return;
2293 }
2294
2295 /*
2296  * helper function to process a set of flags and set bits in the
2297  * appropriate masks.
2298  */
2299 static void
2300 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2301         struct _s_x *flags, char *p)
2302 {
2303         uint8_t set=0, clear=0;
2304
2305         while (p && *p) {
2306                 char *q;        /* points to the separator */
2307                 int val;
2308                 uint8_t *which; /* mask we are working on */
2309
2310                 if (*p == '!') {
2311                         p++;
2312                         which = &clear;
2313                 } else
2314                         which = &set;
2315                 q = strchr(p, ',');
2316                 if (q)
2317                         *q++ = '\0';
2318                 val = match_token(flags, p);
2319                 if (val <= 0)
2320                         errx(EX_DATAERR, "invalid flag %s", p);
2321                 *which |= (uint8_t)val;
2322                 p = q;
2323         }
2324         cmd->opcode = opcode;
2325         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2326         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2327 }
2328
2329
2330 void
2331 ipfw_delete(char *av[])
2332 {
2333         uint32_t rulenum;
2334         int i;
2335         int exitval = EX_OK;
2336         int do_set = 0;
2337
2338         av++;
2339         NEED1("missing rule specification");
2340         if ( *av && _substrcmp(*av, "set") == 0) {
2341                 /* Do not allow using the following syntax:
2342                  *      ipfw set N delete set M
2343                  */
2344                 if (co.use_set)
2345                         errx(EX_DATAERR, "invalid syntax");
2346                 do_set = 1;     /* delete set */
2347                 av++;
2348         }
2349
2350         /* Rule number */
2351         while (*av && isdigit(**av)) {
2352                 i = atoi(*av); av++;
2353                 if (co.do_nat) {
2354                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2355                         if (exitval) {
2356                                 exitval = EX_UNAVAILABLE;
2357                                 warn("rule %u not available", i);
2358                         }
2359                 } else if (co.do_pipe) {
2360                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2361                 } else {
2362                         if (co.use_set)
2363                                 rulenum = (i & 0xffff) | (5 << 24) |
2364                                     ((co.use_set - 1) << 16);
2365                         else
2366                         rulenum =  (i & 0xffff) | (do_set << 24);
2367                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2368                         if (i) {
2369                                 exitval = EX_UNAVAILABLE;
2370                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2371                                     rulenum);
2372                         }
2373                 }
2374         }
2375         if (exitval != EX_OK)
2376                 exit(exitval);
2377 }
2378
2379
2380 /*
2381  * fill the interface structure. We do not check the name as we can
2382  * create interfaces dynamically, so checking them at insert time
2383  * makes relatively little sense.
2384  * Interface names containing '*', '?', or '[' are assumed to be shell
2385  * patterns which match interfaces.
2386  */
2387 static void
2388 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen)
2389 {
2390         cmd->name[0] = '\0';
2391         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2392
2393         CHECK_CMDLEN;
2394
2395         /* Parse the interface or address */
2396         if (strcmp(arg, "any") == 0)
2397                 cmd->o.len = 0;         /* effectively ignore this command */
2398         else if (strncmp(arg, "table(", 6) == 0) {
2399                 char *p = strchr(arg + 6, ',');
2400                 if (p)
2401                         *p++ = '\0';
2402                 cmd->name[0] = '\1'; /* Special value indicating table */
2403                 cmd->p.glob = strtoul(arg + 6, NULL, 0);
2404         } else if (!isdigit(*arg)) {
2405                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2406                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2407         } else if (!inet_aton(arg, &cmd->p.ip))
2408                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2409 }
2410
2411 static void
2412 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2413 {
2414         int i;
2415         size_t l;
2416         char *ap, *ptr, *optr;
2417         struct ether_addr *mac;
2418         const char *macset = "0123456789abcdefABCDEF:";
2419
2420         if (strcmp(p, "any") == 0) {
2421                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2422                         addr[i] = mask[i] = 0;
2423                 return;
2424         }
2425
2426         optr = ptr = strdup(p);
2427         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2428                 l = strlen(ap);
2429                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2430                         errx(EX_DATAERR, "Incorrect MAC address");
2431                 bcopy(mac, addr, ETHER_ADDR_LEN);
2432         } else
2433                 errx(EX_DATAERR, "Incorrect MAC address");
2434
2435         if (ptr != NULL) { /* we have mask? */
2436                 if (p[ptr - optr - 1] == '/') { /* mask len */
2437                         long ml = strtol(ptr, &ap, 10);
2438                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2439                                 errx(EX_DATAERR, "Incorrect mask length");
2440                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2441                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2442                 } else { /* mask */
2443                         l = strlen(ptr);
2444                         if (strspn(ptr, macset) != l ||
2445                             (mac = ether_aton(ptr)) == NULL)
2446                                 errx(EX_DATAERR, "Incorrect mask");
2447                         bcopy(mac, mask, ETHER_ADDR_LEN);
2448                 }
2449         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2450                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2451                         mask[i] = 0xff;
2452         }
2453         for (i = 0; i < ETHER_ADDR_LEN; i++)
2454                 addr[i] &= mask[i];
2455
2456         free(optr);
2457 }
2458
2459 /*
2460  * helper function, updates the pointer to cmd with the length
2461  * of the current command, and also cleans up the first word of
2462  * the new command in case it has been clobbered before.
2463  */
2464 static ipfw_insn *
2465 next_cmd(ipfw_insn *cmd, int *len)
2466 {
2467         *len -= F_LEN(cmd);
2468         CHECK_LENGTH(*len, 0);
2469         cmd += F_LEN(cmd);
2470         bzero(cmd, sizeof(*cmd));
2471         return cmd;
2472 }
2473
2474 /*
2475  * Takes arguments and copies them into a comment
2476  */
2477 static void
2478 fill_comment(ipfw_insn *cmd, char **av, int cblen)
2479 {
2480         int i, l;
2481         char *p = (char *)(cmd + 1);
2482
2483         cmd->opcode = O_NOP;
2484         cmd->len =  (cmd->len & (F_NOT | F_OR));
2485
2486         /* Compute length of comment string. */
2487         for (i = 0, l = 0; av[i] != NULL; i++)
2488                 l += strlen(av[i]) + 1;
2489         if (l == 0)
2490                 return;
2491         if (l > 84)
2492                 errx(EX_DATAERR,
2493                     "comment too long (max 80 chars)");
2494         l = 1 + (l+3)/4;
2495         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2496         CHECK_CMDLEN;
2497
2498         for (i = 0; av[i] != NULL; i++) {
2499                 strcpy(p, av[i]);
2500                 p += strlen(av[i]);
2501                 *p++ = ' ';
2502         }
2503         *(--p) = '\0';
2504 }
2505
2506 /*
2507  * A function to fill simple commands of size 1.
2508  * Existing flags are preserved.
2509  */
2510 static void
2511 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2512 {
2513         cmd->opcode = opcode;
2514         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2515         cmd->arg1 = arg;
2516 }
2517
2518 /*
2519  * Fetch and add the MAC address and type, with masks. This generates one or
2520  * two microinstructions, and returns the pointer to the last one.
2521  */
2522 static ipfw_insn *
2523 add_mac(ipfw_insn *cmd, char *av[], int cblen)
2524 {
2525         ipfw_insn_mac *mac;
2526
2527         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2528                 errx(EX_DATAERR, "MAC dst src");
2529
2530         cmd->opcode = O_MACADDR2;
2531         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2532         CHECK_CMDLEN;
2533
2534         mac = (ipfw_insn_mac *)cmd;
2535         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2536         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2537             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2538         return cmd;
2539 }
2540
2541 static ipfw_insn *
2542 add_mactype(ipfw_insn *cmd, char *av, int cblen)
2543 {
2544         if (!av)
2545                 errx(EX_DATAERR, "missing MAC type");
2546         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2547                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE,
2548                     cblen);
2549                 cmd->opcode = O_MAC_TYPE;
2550                 return cmd;
2551         } else
2552                 return NULL;
2553 }
2554
2555 static ipfw_insn *
2556 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2557 {
2558         struct protoent *pe;
2559         char *ep;
2560         int proto;
2561
2562         proto = strtol(av, &ep, 10);
2563         if (*ep != '\0' || proto <= 0) {
2564                 if ((pe = getprotobyname(av)) == NULL)
2565                         return NULL;
2566                 proto = pe->p_proto;
2567         }
2568
2569         fill_cmd(cmd, O_PROTO, 0, proto);
2570         *protop = proto;
2571         return cmd;
2572 }
2573
2574 static ipfw_insn *
2575 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2576 {
2577         u_char proto = IPPROTO_IP;
2578
2579         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2580                 ; /* do not set O_IP4 nor O_IP6 */
2581         else if (strcmp(av, "ip4") == 0)
2582                 /* explicit "just IPv4" rule */
2583                 fill_cmd(cmd, O_IP4, 0, 0);
2584         else if (strcmp(av, "ip6") == 0) {
2585                 /* explicit "just IPv6" rule */
2586                 proto = IPPROTO_IPV6;
2587                 fill_cmd(cmd, O_IP6, 0, 0);
2588         } else
2589                 return add_proto0(cmd, av, protop);
2590
2591         *protop = proto;
2592         return cmd;
2593 }
2594
2595 static ipfw_insn *
2596 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2597 {
2598         u_char proto = IPPROTO_IP;
2599
2600         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2601                 ; /* do not set O_IP4 nor O_IP6 */
2602         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2603                 /* explicit "just IPv4" rule */
2604                 fill_cmd(cmd, O_IP4, 0, 0);
2605         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2606                 /* explicit "just IPv6" rule */
2607                 proto = IPPROTO_IPV6;
2608                 fill_cmd(cmd, O_IP6, 0, 0);
2609         } else
2610                 return add_proto0(cmd, av, protop);
2611
2612         *protop = proto;
2613         return cmd;
2614 }
2615
2616 static ipfw_insn *
2617 add_srcip(ipfw_insn *cmd, char *av, int cblen)
2618 {
2619         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2620         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2621                 cmd->opcode = O_IP_SRC_SET;
2622         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2623                 cmd->opcode = O_IP_SRC_LOOKUP;
2624         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2625                 cmd->opcode = O_IP_SRC_ME;
2626         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2627                 cmd->opcode = O_IP_SRC;
2628         else                                                    /* addr/mask */
2629                 cmd->opcode = O_IP_SRC_MASK;
2630         return cmd;
2631 }
2632
2633 static ipfw_insn *
2634 add_dstip(ipfw_insn *cmd, char *av, int cblen)
2635 {
2636         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2637         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2638                 ;
2639         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2640                 ;
2641         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2642                 cmd->opcode = O_IP_DST_ME;
2643         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2644                 cmd->opcode = O_IP_DST;
2645         else                                                    /* addr/mask */
2646                 cmd->opcode = O_IP_DST_MASK;
2647         return cmd;
2648 }
2649
2650 static ipfw_insn *
2651 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
2652 {
2653         /* XXX "any" is trapped before. Perhaps "to" */
2654         if (_substrcmp(av, "any") == 0) {
2655                 return NULL;
2656         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
2657                 /* XXX todo: check that we have a protocol with ports */
2658                 cmd->opcode = opcode;
2659                 return cmd;
2660         }
2661         return NULL;
2662 }
2663
2664 static ipfw_insn *
2665 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2666 {
2667         struct in6_addr a;
2668         char *host, *ch;
2669         ipfw_insn *ret = NULL;
2670
2671         if ((host = strdup(av)) == NULL)
2672                 return NULL;
2673         if ((ch = strrchr(host, '/')) != NULL)
2674                 *ch = '\0';
2675
2676         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2677             inet_pton(AF_INET6, host, &a) == 1)
2678                 ret = add_srcip6(cmd, av, cblen);
2679         /* XXX: should check for IPv4, not !IPv6 */
2680         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2681             inet_pton(AF_INET6, host, &a) != 1))
2682                 ret = add_srcip(cmd, av, cblen);
2683         if (ret == NULL && strcmp(av, "any") != 0)
2684                 ret = cmd;
2685
2686         free(host);
2687         return ret;
2688 }
2689
2690 static ipfw_insn *
2691 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2692 {
2693         struct in6_addr a;
2694         char *host, *ch;
2695         ipfw_insn *ret = NULL;
2696
2697         if ((host = strdup(av)) == NULL)
2698                 return NULL;
2699         if ((ch = strrchr(host, '/')) != NULL)
2700                 *ch = '\0';
2701
2702         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2703             inet_pton(AF_INET6, host, &a) == 1)
2704                 ret = add_dstip6(cmd, av, cblen);
2705         /* XXX: should check for IPv4, not !IPv6 */
2706         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2707             inet_pton(AF_INET6, host, &a) != 1))
2708                 ret = add_dstip(cmd, av, cblen);
2709         if (ret == NULL && strcmp(av, "any") != 0)
2710                 ret = cmd;
2711
2712         free(host);
2713         return ret;
2714 }
2715
2716 /*
2717  * Parse arguments and assemble the microinstructions which make up a rule.
2718  * Rules are added into the 'rulebuf' and then copied in the correct order
2719  * into the actual rule.
2720  *
2721  * The syntax for a rule starts with the action, followed by
2722  * optional action parameters, and the various match patterns.
2723  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2724  * (generated if the rule includes a keep-state option), then the
2725  * various match patterns, log/altq actions, and the actual action.
2726  *
2727  */
2728 void
2729 ipfw_add(char *av[])
2730 {
2731         /*
2732          * rules are added into the 'rulebuf' and then copied in
2733          * the correct order into the actual rule.
2734          * Some things that need to go out of order (prob, action etc.)
2735          * go into actbuf[].
2736          */
2737         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2738         int rblen, ablen, cblen;
2739
2740         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2741         ipfw_insn *first_cmd;   /* first match pattern */
2742
2743         struct ip_fw *rule;
2744
2745         /*
2746          * various flags used to record that we entered some fields.
2747          */
2748         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2749         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2750         size_t len;
2751
2752         int i;
2753
2754         int open_par = 0;       /* open parenthesis ( */
2755
2756         /* proto is here because it is used to fetch ports */
2757         u_char proto = IPPROTO_IP;      /* default protocol */
2758
2759         double match_prob = 1; /* match probability, default is always match */
2760
2761         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2762         bzero(cmdbuf, sizeof(cmdbuf));
2763         bzero(rulebuf, sizeof(rulebuf));
2764
2765         rule = (struct ip_fw *)rulebuf;
2766         cmd = (ipfw_insn *)cmdbuf;
2767         action = (ipfw_insn *)actbuf;
2768
2769         rblen = sizeof(rulebuf) / sizeof(rulebuf[0]);
2770         rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]);
2771         ablen = sizeof(actbuf) / sizeof(actbuf[0]);
2772         cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]);
2773         cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1;
2774
2775 #define CHECK_RBUFLEN(len)      { CHECK_LENGTH(rblen, len); rblen -= len; }
2776 #define CHECK_ACTLEN            CHECK_LENGTH(ablen, action->len)
2777
2778         av++;
2779
2780         /* [rule N]     -- Rule number optional */
2781         if (av[0] && isdigit(**av)) {
2782                 rule->rulenum = atoi(*av);
2783                 av++;
2784         }
2785
2786         /* [set N]      -- set number (0..RESVD_SET), optional */
2787         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2788                 int set = strtoul(av[1], NULL, 10);
2789                 if (set < 0 || set > RESVD_SET)
2790                         errx(EX_DATAERR, "illegal set %s", av[1]);
2791                 rule->set = set;
2792                 av += 2;
2793         }
2794
2795         /* [prob D]     -- match probability, optional */
2796         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2797                 match_prob = strtod(av[1], NULL);
2798
2799                 if (match_prob <= 0 || match_prob > 1)
2800                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2801                 av += 2;
2802         }
2803
2804         /* action       -- mandatory */
2805         NEED1("missing action");
2806         i = match_token(rule_actions, *av);
2807         av++;
2808         action->len = 1;        /* default */
2809         CHECK_ACTLEN;
2810         switch(i) {
2811         case TOK_CHECKSTATE:
2812                 have_state = action;
2813                 action->opcode = O_CHECK_STATE;
2814                 break;
2815
2816         case TOK_ACCEPT:
2817                 action->opcode = O_ACCEPT;
2818                 break;
2819
2820         case TOK_DENY:
2821                 action->opcode = O_DENY;
2822                 action->arg1 = 0;
2823                 break;
2824
2825         case TOK_REJECT:
2826                 action->opcode = O_REJECT;
2827                 action->arg1 = ICMP_UNREACH_HOST;
2828                 break;
2829
2830         case TOK_RESET:
2831                 action->opcode = O_REJECT;
2832                 action->arg1 = ICMP_REJECT_RST;
2833                 break;
2834
2835         case TOK_RESET6:
2836                 action->opcode = O_UNREACH6;
2837                 action->arg1 = ICMP6_UNREACH_RST;
2838                 break;
2839
2840         case TOK_UNREACH:
2841                 action->opcode = O_REJECT;
2842                 NEED1("missing reject code");
2843                 fill_reject_code(&action->arg1, *av);
2844                 av++;
2845                 break;
2846
2847         case TOK_UNREACH6:
2848                 action->opcode = O_UNREACH6;
2849                 NEED1("missing unreach code");
2850                 fill_unreach6_code(&action->arg1, *av);
2851                 av++;
2852                 break;
2853
2854         case TOK_COUNT:
2855                 action->opcode = O_COUNT;
2856                 break;
2857
2858         case TOK_NAT:
2859                 action->opcode = O_NAT;
2860                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2861                 CHECK_ACTLEN;
2862                 if (_substrcmp(*av, "global") == 0) {
2863                         action->arg1 = 0;
2864                         av++;
2865                         break;
2866                 } else
2867                         goto chkarg;
2868
2869         case TOK_QUEUE:
2870                 action->opcode = O_QUEUE;
2871                 goto chkarg;
2872         case TOK_PIPE:
2873                 action->opcode = O_PIPE;
2874                 goto chkarg;
2875         case TOK_SKIPTO:
2876                 action->opcode = O_SKIPTO;
2877                 goto chkarg;
2878         case TOK_NETGRAPH:
2879                 action->opcode = O_NETGRAPH;
2880                 goto chkarg;
2881         case TOK_NGTEE:
2882                 action->opcode = O_NGTEE;
2883                 goto chkarg;
2884         case TOK_DIVERT:
2885                 action->opcode = O_DIVERT;
2886                 goto chkarg;
2887         case TOK_TEE:
2888                 action->opcode = O_TEE;
2889                 goto chkarg;
2890         case TOK_CALL:
2891                 action->opcode = O_CALLRETURN;
2892 chkarg:
2893                 if (!av[0])
2894                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2895                 if (isdigit(**av)) {
2896                         action->arg1 = strtoul(*av, NULL, 10);
2897                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2898                                 errx(EX_DATAERR, "illegal argument for %s",
2899                                     *(av - 1));
2900                 } else if (_substrcmp(*av, "tablearg") == 0) {
2901                         action->arg1 = IP_FW_TABLEARG;
2902                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2903                         struct servent *s;
2904                         setservent(1);
2905                         s = getservbyname(av[0], "divert");
2906                         if (s != NULL)
2907                                 action->arg1 = ntohs(s->s_port);
2908                         else
2909                                 errx(EX_DATAERR, "illegal divert/tee port");
2910                 } else
2911                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2912                 av++;
2913                 break;
2914
2915         case TOK_FORWARD: {
2916                 /*
2917                  * Locate the address-port separator (':' or ',').
2918                  * Could be one of the following:
2919                  *      hostname:port
2920                  *      IPv4 a.b.c.d,port
2921                  *      IPv4 a.b.c.d:port
2922                  *      IPv6 w:x:y::z,port
2923                  * The ':' can only be used with hostname and IPv4 address.
2924                  * XXX-BZ Should we also support [w:x:y::z]:port?
2925                  */
2926                 struct sockaddr_storage result;
2927                 struct addrinfo *res;
2928                 char *s, *end;
2929                 int family;
2930                 u_short port_number;
2931
2932                 NEED1("missing forward address[:port]");
2933
2934                 /*
2935                  * locate the address-port separator (':' or ',')
2936                  */
2937                 s = strchr(*av, ',');
2938                 if (s == NULL) {
2939                         /* Distinguish between IPv4:port and IPv6 cases. */
2940                         s = strchr(*av, ':');
2941                         if (s && strchr(s+1, ':'))
2942                                 s = NULL; /* no port */
2943                 }
2944
2945                 port_number = 0;
2946                 if (s != NULL) {
2947                         /* Terminate host portion and set s to start of port. */
2948                         *(s++) = '\0';
2949                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2950                         if (s == end)
2951                                 errx(EX_DATAERR,
2952                                     "illegal forwarding port ``%s''", s);
2953                         port_number = (u_short)i;
2954                 }
2955
2956                 if (_substrcmp(*av, "tablearg") == 0) {
2957                         family = PF_INET;
2958                         ((struct sockaddr_in*)&result)->sin_addr.s_addr =
2959                             INADDR_ANY;
2960                 } else {
2961                         /*
2962                          * Resolve the host name or address to a family and a
2963                          * network representation of the addres.
2964                          */
2965                         if (getaddrinfo(*av, NULL, NULL, &res))
2966                                 errx(EX_DATAERR, NULL);
2967                         /* Just use the first host in the answer. */
2968                         family = res->ai_family;
2969                         memcpy(&result, res->ai_addr, res->ai_addrlen);
2970                         freeaddrinfo(res);
2971                 }
2972
2973                 if (family == PF_INET) {
2974                         ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2975
2976                         action->opcode = O_FORWARD_IP;
2977                         action->len = F_INSN_SIZE(ipfw_insn_sa);
2978                         CHECK_ACTLEN;
2979
2980                         /*
2981                          * In the kernel we assume AF_INET and use only
2982                          * sin_port and sin_addr. Remember to set sin_len as
2983                          * the routing code seems to use it too.
2984                          */
2985                         p->sa.sin_len = sizeof(struct sockaddr_in);
2986                         p->sa.sin_family = AF_INET;
2987                         p->sa.sin_port = port_number;
2988                         p->sa.sin_addr.s_addr =
2989                              ((struct sockaddr_in *)&result)->sin_addr.s_addr;
2990                 } else if (family == PF_INET6) {
2991                         ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
2992
2993                         action->opcode = O_FORWARD_IP6;
2994                         action->len = F_INSN_SIZE(ipfw_insn_sa6);
2995                         CHECK_ACTLEN;
2996
2997                         p->sa.sin6_len = sizeof(struct sockaddr_in6);
2998                         p->sa.sin6_family = AF_INET6;
2999                         p->sa.sin6_port = port_number;
3000                         p->sa.sin6_flowinfo = 0;
3001                         p->sa.sin6_scope_id = 0;
3002                         /* No table support for v6 yet. */
3003                         bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
3004                             &p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
3005                 } else {
3006                         errx(EX_DATAERR, "Invalid address family in forward action");
3007                 }
3008                 av++;
3009                 break;
3010             }
3011         case TOK_COMMENT:
3012                 /* pretend it is a 'count' rule followed by the comment */
3013                 action->opcode = O_COUNT;
3014                 av--;           /* go back... */
3015                 break;
3016
3017         case TOK_SETFIB:
3018             {
3019                 int numfibs;
3020                 size_t intsize = sizeof(int);
3021
3022                 action->opcode = O_SETFIB;
3023                 NEED1("missing fib number");
3024                 if (_substrcmp(*av, "tablearg") == 0) {
3025                         action->arg1 = IP_FW_TABLEARG;
3026                 } else {
3027                         action->arg1 = strtoul(*av, NULL, 10);
3028                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
3029                             NULL, 0) == -1)
3030                                 errx(EX_DATAERR, "fibs not suported.\n");
3031                         if (action->arg1 >= numfibs)  /* Temporary */
3032                                 errx(EX_DATAERR, "fib too large.\n");
3033                 }
3034                 av++;
3035                 break;
3036             }
3037
3038         case TOK_REASS:
3039                 action->opcode = O_REASS;
3040                 break;
3041
3042         case TOK_RETURN:
3043                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
3044                 break;
3045
3046         default:
3047                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
3048         }
3049         action = next_cmd(action, &ablen);
3050
3051         /*
3052          * [altq queuename] -- altq tag, optional
3053          * [log [logamount N]]  -- log, optional
3054          *
3055          * If they exist, it go first in the cmdbuf, but then it is
3056          * skipped in the copy section to the end of the buffer.
3057          */
3058         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
3059                 av++;
3060                 switch (i) {
3061                 case TOK_LOG:
3062                     {
3063                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
3064                         int l;
3065
3066                         if (have_log)
3067                                 errx(EX_DATAERR,
3068                                     "log cannot be specified more than once");
3069                         have_log = (ipfw_insn *)c;
3070                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
3071                         CHECK_CMDLEN;
3072                         cmd->opcode = O_LOG;
3073                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
3074                                 av++;
3075                                 NEED1("logamount requires argument");
3076                                 l = atoi(*av);
3077                                 if (l < 0)
3078                                         errx(EX_DATAERR,
3079                                             "logamount must be positive");
3080                                 c->max_log = l;
3081                                 av++;
3082                         } else {
3083                                 len = sizeof(c->max_log);
3084                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
3085                                     &c->max_log, &len, NULL, 0) == -1) {
3086                                         if (co.test_only) {
3087                                                 c->max_log = 0;
3088                                                 break;
3089                                         }
3090                                         errx(1, "sysctlbyname(\"%s\")",
3091                                             "net.inet.ip.fw.verbose_limit");
3092                                 }
3093                         }
3094                     }
3095                         break;
3096
3097 #ifndef NO_ALTQ
3098                 case TOK_ALTQ:
3099                     {
3100                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
3101
3102                         NEED1("missing altq queue name");
3103                         if (have_altq)
3104                                 errx(EX_DATAERR,
3105                                     "altq cannot be specified more than once");
3106                         have_altq = (ipfw_insn *)a;
3107                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
3108                         CHECK_CMDLEN;
3109                         cmd->opcode = O_ALTQ;
3110                         a->qid = altq_name_to_qid(*av);
3111                         av++;
3112                     }
3113                         break;
3114 #endif
3115
3116                 case TOK_TAG:
3117                 case TOK_UNTAG: {
3118                         uint16_t tag;
3119
3120                         if (have_tag)
3121                                 errx(EX_USAGE, "tag and untag cannot be "
3122                                     "specified more than once");
3123                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
3124                            rule_action_params);
3125                         have_tag = cmd;
3126                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
3127                         av++;
3128                         break;
3129                 }
3130
3131                 default:
3132                         abort();
3133                 }
3134                 cmd = next_cmd(cmd, &cblen);
3135         }
3136
3137         if (have_state) /* must be a check-state, we are done */
3138                 goto done;
3139
3140 #define OR_START(target)                                        \
3141         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
3142                 if (open_par)                                   \
3143                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
3144                 prev = NULL;                                    \
3145                 open_par = 1;                                   \
3146                 if ( (av[0])[1] == '\0') {                      \
3147                         av++;                                   \
3148                 } else                                          \
3149                         (*av)++;                                \
3150         }                                                       \
3151         target:                                                 \
3152
3153
3154 #define CLOSE_PAR                                               \
3155         if (open_par) {                                         \
3156                 if (av[0] && (                                  \
3157                     strcmp(*av, ")") == 0 ||                    \
3158                     strcmp(*av, "}") == 0)) {                   \
3159                         prev = NULL;                            \
3160                         open_par = 0;                           \
3161                         av++;                                   \
3162                 } else                                          \
3163                         errx(EX_USAGE, "missing \")\"\n");      \
3164         }
3165
3166 #define NOT_BLOCK                                               \
3167         if (av[0] && _substrcmp(*av, "not") == 0) {             \
3168                 if (cmd->len & F_NOT)                           \
3169                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3170                 cmd->len |= F_NOT;                              \
3171                 av++;                                           \
3172         }
3173
3174 #define OR_BLOCK(target)                                        \
3175         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3176                 if (prev == NULL || open_par == 0)              \
3177                         errx(EX_DATAERR, "invalid OR block");   \
3178                 prev->len |= F_OR;                              \
3179                 av++;                                   \
3180                 goto target;                                    \
3181         }                                                       \
3182         CLOSE_PAR;
3183
3184         first_cmd = cmd;
3185
3186 #if 0
3187         /*
3188          * MAC addresses, optional.
3189          * If we have this, we skip the part "proto from src to dst"
3190          * and jump straight to the option parsing.
3191          */
3192         NOT_BLOCK;
3193         NEED1("missing protocol");
3194         if (_substrcmp(*av, "MAC") == 0 ||
3195             _substrcmp(*av, "mac") == 0) {
3196                 av++;                   /* the "MAC" keyword */
3197                 add_mac(cmd, av);       /* exits in case of errors */
3198                 cmd = next_cmd(cmd);
3199                 av += 2;                /* dst-mac and src-mac */
3200                 NOT_BLOCK;
3201                 NEED1("missing mac type");
3202                 if (add_mactype(cmd, av[0]))
3203                         cmd = next_cmd(cmd);
3204                 av++;                   /* any or mac-type */
3205                 goto read_options;
3206         }
3207 #endif
3208
3209         /*
3210          * protocol, mandatory
3211          */
3212     OR_START(get_proto);
3213         NOT_BLOCK;
3214         NEED1("missing protocol");
3215         if (add_proto_compat(cmd, *av, &proto)) {
3216                 av++;
3217                 if (F_LEN(cmd) != 0) {
3218                         prev = cmd;
3219                         cmd = next_cmd(cmd, &cblen);
3220                 }
3221         } else if (first_cmd != cmd) {
3222                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3223         } else
3224                 goto read_options;
3225     OR_BLOCK(get_proto);
3226
3227         /*
3228          * "from", mandatory
3229          */
3230         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3231                 errx(EX_USAGE, "missing ``from''");
3232         av++;
3233
3234         /*
3235          * source IP, mandatory
3236          */
3237     OR_START(source_ip);
3238         NOT_BLOCK;      /* optional "not" */
3239         NEED1("missing source address");
3240         if (add_src(cmd, *av, proto, cblen)) {
3241                 av++;
3242                 if (F_LEN(cmd) != 0) {  /* ! any */
3243                         prev = cmd;
3244                         cmd = next_cmd(cmd, &cblen);
3245                 }
3246         } else
3247                 errx(EX_USAGE, "bad source address %s", *av);
3248     OR_BLOCK(source_ip);
3249
3250         /*
3251          * source ports, optional
3252          */
3253         NOT_BLOCK;      /* optional "not" */
3254         if ( av[0] != NULL ) {
3255                 if (_substrcmp(*av, "any") == 0 ||
3256                     add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3257                         av++;
3258                         if (F_LEN(cmd) != 0)
3259                                 cmd = next_cmd(cmd, &cblen);
3260                 }
3261         }
3262
3263         /*
3264          * "to", mandatory
3265          */
3266         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3267                 errx(EX_USAGE, "missing ``to''");
3268         av++;
3269
3270         /*
3271          * destination, mandatory
3272          */
3273     OR_START(dest_ip);
3274         NOT_BLOCK;      /* optional "not" */
3275         NEED1("missing dst address");
3276         if (add_dst(cmd, *av, proto, cblen)) {
3277                 av++;
3278                 if (F_LEN(cmd) != 0) {  /* ! any */
3279                         prev = cmd;
3280                         cmd = next_cmd(cmd, &cblen);
3281                 }
3282         } else
3283                 errx( EX_USAGE, "bad destination address %s", *av);
3284     OR_BLOCK(dest_ip);
3285
3286         /*
3287          * dest. ports, optional
3288          */
3289         NOT_BLOCK;      /* optional "not" */
3290         if (av[0]) {
3291                 if (_substrcmp(*av, "any") == 0 ||
3292                     add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3293                         av++;
3294                         if (F_LEN(cmd) != 0)
3295                                 cmd = next_cmd(cmd, &cblen);
3296                 }
3297         }
3298
3299 read_options:
3300         if (av[0] && first_cmd == cmd) {
3301                 /*
3302                  * nothing specified so far, store in the rule to ease
3303                  * printout later.
3304                  */
3305                  rule->_pad = 1;
3306         }
3307         prev = NULL;
3308         while ( av[0] != NULL ) {
3309                 char *s;
3310                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3311
3312                 s = *av;
3313                 cmd32 = (ipfw_insn_u32 *)cmd;
3314
3315                 if (*s == '!') {        /* alternate syntax for NOT */
3316                         if (cmd->len & F_NOT)
3317                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3318                         cmd->len = F_NOT;
3319                         s++;
3320                 }
3321                 i = match_token(rule_options, s);
3322                 av++;
3323                 switch(i) {
3324                 case TOK_NOT:
3325                         if (cmd->len & F_NOT)
3326                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3327                         cmd->len = F_NOT;
3328                         break;
3329
3330                 case TOK_OR:
3331                         if (open_par == 0 || prev == NULL)
3332                                 errx(EX_USAGE, "invalid \"or\" block\n");
3333                         prev->len |= F_OR;
3334                         break;
3335
3336                 case TOK_STARTBRACE:
3337                         if (open_par)
3338                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3339                         open_par = 1;
3340                         break;
3341
3342                 case TOK_ENDBRACE:
3343                         if (!open_par)
3344                                 errx(EX_USAGE, "+missing \")\"\n");
3345                         open_par = 0;
3346                         prev = NULL;
3347                         break;
3348
3349                 case TOK_IN:
3350                         fill_cmd(cmd, O_IN, 0, 0);
3351                         break;
3352
3353                 case TOK_OUT:
3354                         cmd->len ^= F_NOT; /* toggle F_NOT */
3355                         fill_cmd(cmd, O_IN, 0, 0);
3356                         break;
3357
3358                 case TOK_DIVERTED:
3359                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3360                         break;
3361
3362                 case TOK_DIVERTEDLOOPBACK:
3363                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3364                         break;
3365
3366                 case TOK_DIVERTEDOUTPUT:
3367                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3368                         break;
3369
3370                 case TOK_FRAG:
3371                         fill_cmd(cmd, O_FRAG, 0, 0);
3372                         break;
3373
3374                 case TOK_LAYER2:
3375                         fill_cmd(cmd, O_LAYER2, 0, 0);
3376                         break;
3377
3378                 case TOK_XMIT:
3379                 case TOK_RECV:
3380                 case TOK_VIA:
3381                         NEED1("recv, xmit, via require interface name"
3382                                 " or address");
3383                         fill_iface((ipfw_insn_if *)cmd, av[0], cblen);
3384                         av++;
3385                         if (F_LEN(cmd) == 0)    /* not a valid address */
3386                                 break;
3387                         if (i == TOK_XMIT)
3388                                 cmd->opcode = O_XMIT;
3389                         else if (i == TOK_RECV)
3390                                 cmd->opcode = O_RECV;
3391                         else if (i == TOK_VIA)
3392                                 cmd->opcode = O_VIA;
3393                         break;
3394
3395                 case TOK_ICMPTYPES:
3396                         NEED1("icmptypes requires list of types");
3397                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3398                         av++;
3399                         break;
3400
3401                 case TOK_ICMP6TYPES:
3402                         NEED1("icmptypes requires list of types");
3403                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen);
3404                         av++;
3405                         break;
3406
3407                 case TOK_IPTTL:
3408                         NEED1("ipttl requires TTL");
3409                         if (strpbrk(*av, "-,")) {
3410                             if (!add_ports(cmd, *av, 0, O_IPTTL, cblen))
3411                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3412                         } else
3413                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3414                         av++;
3415                         break;
3416
3417                 case TOK_IPID:
3418                         NEED1("ipid requires id");
3419                         if (strpbrk(*av, "-,")) {
3420                             if (!add_ports(cmd, *av, 0, O_IPID, cblen))
3421                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3422                         } else
3423                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3424                         av++;
3425                         break;
3426
3427                 case TOK_IPLEN:
3428                         NEED1("iplen requires length");
3429                         if (strpbrk(*av, "-,")) {
3430                             if (!add_ports(cmd, *av, 0, O_IPLEN, cblen))
3431                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3432                         } else
3433                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3434                         av++;
3435                         break;
3436
3437                 case TOK_IPVER:
3438                         NEED1("ipver requires version");
3439                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3440                         av++;
3441                         break;
3442
3443                 case TOK_IPPRECEDENCE:
3444                         NEED1("ipprecedence requires value");
3445                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3446                             (strtoul(*av, NULL, 0) & 7) << 5);
3447                         av++;
3448                         break;
3449
3450                 case TOK_IPOPTS:
3451                         NEED1("missing argument for ipoptions");
3452                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3453                         av++;
3454                         break;
3455
3456                 case TOK_IPTOS:
3457                         NEED1("missing argument for iptos");
3458                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3459                         av++;
3460                         break;
3461
3462                 case TOK_UID:
3463                         NEED1("uid requires argument");
3464                     {
3465                         char *end;
3466                         uid_t uid;
3467                         struct passwd *pwd;
3468
3469                         cmd->opcode = O_UID;
3470                         uid = strtoul(*av, &end, 0);
3471                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3472                         if (pwd == NULL)
3473                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3474                         cmd32->d[0] = pwd->pw_uid;
3475                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3476                         av++;
3477                     }
3478                         break;
3479
3480                 case TOK_GID:
3481                         NEED1("gid requires argument");
3482                     {
3483                         char *end;
3484                         gid_t gid;
3485                         struct group *grp;
3486
3487                         cmd->opcode = O_GID;
3488                         gid = strtoul(*av, &end, 0);
3489                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3490                         if (grp == NULL)
3491                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3492                         cmd32->d[0] = grp->gr_gid;
3493                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3494                         av++;
3495                     }
3496                         break;
3497
3498                 case TOK_JAIL:
3499                         NEED1("jail requires argument");
3500                     {
3501                         char *end;
3502                         int jid;
3503
3504                         cmd->opcode = O_JAIL;
3505                         jid = (int)strtol(*av, &end, 0);
3506                         if (jid < 0 || *end != '\0')
3507                                 errx(EX_DATAERR, "jail requires prison ID");
3508                         cmd32->d[0] = (uint32_t)jid;
3509                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3510                         av++;
3511                     }
3512                         break;
3513
3514                 case TOK_ESTAB:
3515                         fill_cmd(cmd, O_ESTAB, 0, 0);
3516                         break;
3517
3518                 case TOK_SETUP:
3519                         fill_cmd(cmd, O_TCPFLAGS, 0,
3520                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3521                         break;
3522
3523                 case TOK_TCPDATALEN:
3524                         NEED1("tcpdatalen requires length");
3525                         if (strpbrk(*av, "-,")) {
3526                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen))
3527                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3528                         } else
3529                             fill_cmd(cmd, O_TCPDATALEN, 0,
3530                                     strtoul(*av, NULL, 0));
3531                         av++;
3532                         break;
3533
3534                 case TOK_TCPOPTS:
3535                         NEED1("missing argument for tcpoptions");
3536                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3537                         av++;
3538                         break;
3539
3540                 case TOK_TCPSEQ:
3541                 case TOK_TCPACK:
3542                         NEED1("tcpseq/tcpack requires argument");
3543                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3544                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3545                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3546                         av++;
3547                         break;
3548
3549                 case TOK_TCPWIN:
3550                         NEED1("tcpwin requires length");
3551                         if (strpbrk(*av, "-,")) {
3552                             if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen))
3553                                 errx(EX_DATAERR, "invalid tcpwin len %s", *av);
3554                         } else
3555                             fill_cmd(cmd, O_TCPWIN, 0,
3556                                     strtoul(*av, NULL, 0));
3557                         av++;
3558                         break;
3559
3560                 case TOK_TCPFLAGS:
3561                         NEED1("missing argument for tcpflags");
3562                         cmd->opcode = O_TCPFLAGS;
3563                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3564                         av++;
3565                         break;
3566
3567                 case TOK_KEEPSTATE:
3568                         if (open_par)
3569                                 errx(EX_USAGE, "keep-state cannot be part "
3570                                     "of an or block");
3571                         if (have_state)
3572                                 errx(EX_USAGE, "only one of keep-state "
3573                                         "and limit is allowed");
3574                         have_state = cmd;
3575                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3576                         break;
3577
3578                 case TOK_LIMIT: {
3579                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3580                         int val;
3581
3582                         if (open_par)
3583                                 errx(EX_USAGE,
3584                                     "limit cannot be part of an or block");
3585                         if (have_state)
3586                                 errx(EX_USAGE, "only one of keep-state and "
3587                                     "limit is allowed");
3588                         have_state = cmd;
3589
3590                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3591                         CHECK_CMDLEN;
3592                         cmd->opcode = O_LIMIT;
3593                         c->limit_mask = c->conn_limit = 0;
3594
3595                         while ( av[0] != NULL ) {
3596                                 if ((val = match_token(limit_masks, *av)) <= 0)
3597                                         break;
3598                                 c->limit_mask |= val;
3599                                 av++;
3600                         }
3601
3602                         if (c->limit_mask == 0)
3603                                 errx(EX_USAGE, "limit: missing limit mask");
3604
3605                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3606                             TOK_LIMIT, rule_options);
3607
3608                         av++;
3609                         break;
3610                 }
3611
3612                 case TOK_PROTO:
3613                         NEED1("missing protocol");
3614                         if (add_proto(cmd, *av, &proto)) {
3615                                 av++;
3616                         } else
3617                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3618                                     *av);
3619                         break;
3620
3621                 case TOK_SRCIP:
3622                         NEED1("missing source IP");
3623                         if (add_srcip(cmd, *av, cblen)) {
3624                                 av++;
3625                         }
3626                         break;
3627
3628                 case TOK_DSTIP:
3629                         NEED1("missing destination IP");
3630                         if (add_dstip(cmd, *av, cblen)) {
3631                                 av++;
3632                         }
3633                         break;
3634
3635                 case TOK_SRCIP6:
3636                         NEED1("missing source IP6");
3637                         if (add_srcip6(cmd, *av, cblen)) {
3638                                 av++;
3639                         }
3640                         break;
3641
3642                 case TOK_DSTIP6:
3643                         NEED1("missing destination IP6");
3644                         if (add_dstip6(cmd, *av, cblen)) {
3645                                 av++;
3646                         }
3647                         break;
3648
3649                 case TOK_SRCPORT:
3650                         NEED1("missing source port");
3651                         if (_substrcmp(*av, "any") == 0 ||
3652                             add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3653                                 av++;
3654                         } else
3655                                 errx(EX_DATAERR, "invalid source port %s", *av);
3656                         break;
3657
3658                 case TOK_DSTPORT:
3659                         NEED1("missing destination port");
3660                         if (_substrcmp(*av, "any") == 0 ||
3661                             add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3662                                 av++;
3663                         } else
3664                                 errx(EX_DATAERR, "invalid destination port %s",
3665                                     *av);
3666                         break;
3667
3668                 case TOK_MAC:
3669                         if (add_mac(cmd, av, cblen))
3670                                 av += 2;
3671                         break;
3672
3673                 case TOK_MACTYPE:
3674                         NEED1("missing mac type");
3675                         if (!add_mactype(cmd, *av, cblen))
3676                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3677                         av++;
3678                         break;
3679
3680                 case TOK_VERREVPATH:
3681                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3682                         break;
3683
3684                 case TOK_VERSRCREACH:
3685                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3686                         break;
3687
3688                 case TOK_ANTISPOOF:
3689                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3690                         break;
3691
3692                 case TOK_IPSEC:
3693                         fill_cmd(cmd, O_IPSEC, 0, 0);
3694                         break;
3695
3696                 case TOK_IPV6:
3697                         fill_cmd(cmd, O_IP6, 0, 0);
3698                         break;
3699
3700                 case TOK_IPV4:
3701                         fill_cmd(cmd, O_IP4, 0, 0);
3702                         break;
3703
3704                 case TOK_EXT6HDR:
3705                         fill_ext6hdr( cmd, *av );
3706                         av++;
3707                         break;
3708
3709                 case TOK_FLOWID:
3710                         if (proto != IPPROTO_IPV6 )
3711                                 errx( EX_USAGE, "flow-id filter is active "
3712                                     "only for ipv6 protocol\n");
3713                         fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen);
3714                         av++;
3715                         break;
3716
3717                 case TOK_COMMENT:
3718                         fill_comment(cmd, av, cblen);
3719                         av[0]=NULL;
3720                         break;
3721
3722                 case TOK_TAGGED:
3723                         if (av[0] && strpbrk(*av, "-,")) {
3724                                 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen))
3725                                         errx(EX_DATAERR, "tagged: invalid tag"
3726                                             " list: %s", *av);
3727                         }
3728                         else {
3729                                 uint16_t tag;
3730
3731                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3732                                     TOK_TAGGED, rule_options);
3733                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3734                         }
3735                         av++;
3736                         break;
3737
3738                 case TOK_FIB:
3739                         NEED1("fib requires fib number");
3740                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3741                         av++;
3742                         break;
3743                 case TOK_SOCKARG:
3744                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3745                         break;
3746
3747                 case TOK_LOOKUP: {
3748                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3749                         char *p;
3750                         int j;
3751
3752                         if (!av[0] || !av[1])
3753                                 errx(EX_USAGE, "format: lookup argument tablenum");
3754                         cmd->opcode = O_IP_DST_LOOKUP;
3755                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3756                         i = match_token(rule_options, *av);
3757                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3758                                 if (i == lookup_key[j])
3759                                         break;
3760                         }
3761                         if (lookup_key[j] <= 0)
3762                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3763                         __PAST_END(c->d, 1) = j; // i converted to option
3764                         av++;
3765                         cmd->arg1 = strtoul(*av, &p, 0);
3766                         if (p && *p)
3767                                 errx(EX_USAGE, "format: lookup argument tablenum");
3768                         av++;
3769                     }
3770                         break;
3771
3772                 default:
3773                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3774                 }
3775                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3776                         prev = cmd;
3777                         cmd = next_cmd(cmd, &cblen);
3778                 }
3779         }
3780
3781 done:
3782         /*
3783          * Now copy stuff into the rule.
3784          * If we have a keep-state option, the first instruction
3785          * must be a PROBE_STATE (which is generated here).
3786          * If we have a LOG option, it was stored as the first command,
3787          * and now must be moved to the top of the action part.
3788          */
3789         dst = (ipfw_insn *)rule->cmd;
3790
3791         /*
3792          * First thing to write into the command stream is the match probability.
3793          */
3794         if (match_prob != 1) { /* 1 means always match */
3795                 dst->opcode = O_PROB;
3796                 dst->len = 2;
3797                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3798                 dst += dst->len;
3799         }
3800
3801         /*
3802          * generate O_PROBE_STATE if necessary
3803          */
3804         if (have_state && have_state->opcode != O_CHECK_STATE) {
3805                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3806                 dst = next_cmd(dst, &rblen);
3807         }
3808
3809         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3810         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3811                 i = F_LEN(src);
3812                 CHECK_RBUFLEN(i);
3813
3814                 switch (src->opcode) {
3815                 case O_LOG:
3816                 case O_KEEP_STATE:
3817                 case O_LIMIT:
3818                 case O_ALTQ:
3819                 case O_TAG:
3820                         break;
3821                 default:
3822                         bcopy(src, dst, i * sizeof(uint32_t));
3823                         dst += i;
3824                 }
3825         }
3826
3827         /*
3828          * put back the have_state command as last opcode
3829          */
3830         if (have_state && have_state->opcode != O_CHECK_STATE) {
3831                 i = F_LEN(have_state);
3832                 CHECK_RBUFLEN(i);
3833                 bcopy(have_state, dst, i * sizeof(uint32_t));
3834                 dst += i;
3835         }
3836         /*
3837          * start action section
3838          */
3839         rule->act_ofs = dst - rule->cmd;
3840
3841         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3842         if (have_log) {
3843                 i = F_LEN(have_log);
3844                 CHECK_RBUFLEN(i);
3845                 bcopy(have_log, dst, i * sizeof(uint32_t));
3846                 dst += i;
3847         }
3848         if (have_altq) {
3849                 i = F_LEN(have_altq);
3850                 CHECK_RBUFLEN(i);
3851                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3852                 dst += i;
3853         }
3854         if (have_tag) {
3855                 i = F_LEN(have_tag);
3856                 CHECK_RBUFLEN(i);
3857                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3858                 dst += i;
3859         }
3860
3861         /*
3862          * copy all other actions
3863          */
3864         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3865                 i = F_LEN(src);
3866                 CHECK_RBUFLEN(i);
3867                 bcopy(src, dst, i * sizeof(uint32_t));
3868                 dst += i;
3869         }
3870
3871         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3872         i = (char *)dst - (char *)rule;
3873         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3874                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3875         if (!co.do_quiet)
3876                 show_ipfw(rule, 0, 0);
3877 }
3878
3879 /*
3880  * clear the counters or the log counters.
3881  */
3882 void
3883 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3884 {
3885         uint32_t arg, saved_arg;
3886         int failed = EX_OK;
3887         char const *errstr;
3888         char const *name = optname ? "RESETLOG" : "ZERO";
3889
3890         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3891
3892         av++; ac--;
3893
3894         if (!ac) {
3895                 /* clear all entries */
3896                 if (do_cmd(optname, NULL, 0) < 0)
3897                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3898                 if (!co.do_quiet)
3899                         printf("%s.\n", optname == IP_FW_ZERO ?
3900                             "Accounting cleared":"Logging counts reset");
3901
3902                 return;
3903         }
3904
3905         while (ac) {
3906                 /* Rule number */
3907                 if (isdigit(**av)) {
3908                         arg = strtonum(*av, 0, 0xffff, &errstr);
3909                         if (errstr)
3910                                 errx(EX_DATAERR,
3911                                     "invalid rule number %s\n", *av);
3912                         saved_arg = arg;
3913                         if (co.use_set)
3914                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3915                         av++;
3916                         ac--;
3917                         if (do_cmd(optname, &arg, sizeof(arg))) {
3918                                 warn("rule %u: setsockopt(IP_FW_%s)",
3919                                     saved_arg, name);
3920                                 failed = EX_UNAVAILABLE;
3921                         } else if (!co.do_quiet)
3922                                 printf("Entry %d %s.\n", saved_arg,
3923                                     optname == IP_FW_ZERO ?
3924                                         "cleared" : "logging count reset");
3925                 } else {
3926                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3927                 }
3928         }
3929         if (failed != EX_OK)
3930                 exit(failed);
3931 }
3932
3933 void
3934 ipfw_flush(int force)
3935 {
3936         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3937
3938         if (!force && !co.do_quiet) { /* need to ask user */
3939                 int c;
3940
3941                 printf("Are you sure? [yn] ");
3942                 fflush(stdout);
3943                 do {
3944                         c = toupper(getc(stdin));
3945                         while (c != '\n' && getc(stdin) != '\n')
3946                                 if (feof(stdin))
3947                                         return; /* and do not flush */
3948                 } while (c != 'Y' && c != 'N');
3949                 printf("\n");
3950                 if (c == 'N')   /* user said no */
3951                         return;
3952         }
3953         if (co.do_pipe) {
3954                 dummynet_flush();
3955                 return;
3956         }
3957         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3958         if (co.use_set) {
3959                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3960                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3961                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3962         } else if (do_cmd(cmd, NULL, 0) < 0)
3963                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3964                     co.do_pipe ? "DUMMYNET" : "FW");
3965         if (!co.do_quiet)
3966                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3967 }
3968
3969
3970 static void table_list(uint16_t num, int need_header);
3971 static void table_fill_xentry(char *arg, ipfw_table_xentry *xent);
3972
3973 /*
3974  * This one handles all table-related commands
3975  *      ipfw table N add addr[/masklen] [value]
3976  *      ipfw table N delete addr[/masklen]
3977  *      ipfw table {N | all} flush
3978  *      ipfw table {N | all} list
3979  */
3980 void
3981 ipfw_table_handler(int ac, char *av[])
3982 {
3983         ipfw_table_xentry xent;
3984         int do_add;
3985         int is_all;
3986         size_t len;
3987         uint32_t a;
3988         uint32_t tables_max;
3989
3990         len = sizeof(tables_max);
3991         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3992             NULL, 0) == -1) {
3993                 if (co.test_only)
3994                         tables_max = 128; /* Old conservative default */
3995                 else
3996                         errx(1, "Can't determine maximum number of ipfw tables."
3997                             " Perhaps you forgot to load ipfw module?");
3998         }
3999
4000         memset(&xent, 0, sizeof(xent));
4001
4002         ac--; av++;
4003         if (ac && isdigit(**av)) {
4004                 xent.tbl = atoi(*av);
4005                 is_all = 0;
4006                 ac--; av++;
4007         } else if (ac && _substrcmp(*av, "all") == 0) {
4008                 xent.tbl = 0;
4009                 is_all = 1;
4010                 ac--; av++;
4011         } else
4012                 errx(EX_USAGE, "table number or 'all' keyword required");
4013         if (xent.tbl >= tables_max)
4014                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
4015                         "value (%d)", tables_max - 1);
4016         NEED1("table needs command");
4017         if (is_all && _substrcmp(*av, "list") != 0
4018                    && _substrcmp(*av, "flush") != 0)
4019                 errx(EX_USAGE, "table number required");
4020
4021         if (_substrcmp(*av, "add") == 0 ||
4022             _substrcmp(*av, "delete") == 0) {
4023                 do_add = **av == 'a';
4024                 ac--; av++;
4025                 if (!ac)
4026                         errx(EX_USAGE, "address required");
4027
4028                 table_fill_xentry(*av, &xent);
4029
4030                 ac--; av++;
4031                 if (do_add && ac) {
4032                         unsigned int tval;
4033                         /* isdigit is a bit of a hack here.. */
4034                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
4035                                 xent.value = strtoul(*av, NULL, 0);
4036                         } else {
4037                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
4038                                         /* The value must be stored in host order        *
4039                                          * so that the values < 65k can be distinguished */
4040                                         xent.value = ntohl(tval);
4041                                 } else {
4042                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
4043                                 }
4044                         }
4045                 } else
4046                         xent.value = 0;
4047                 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL,
4048                     &xent, xent.len) < 0) {
4049                         /* If running silent, don't bomb out on these errors. */
4050                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
4051                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
4052                                     do_add ? "XADD" : "XDEL");
4053                         /* In silent mode, react to a failed add by deleting */
4054                         if (do_add) {
4055                                 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len);
4056                                 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0)
4057                                         err(EX_OSERR,
4058                                             "setsockopt(IP_FW_TABLE_XADD)");
4059                         }
4060                 }
4061         } else if (_substrcmp(*av, "flush") == 0) {
4062                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4063                 do {
4064                         if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl,
4065                             sizeof(xent.tbl)) < 0)
4066                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
4067                 } while (++xent.tbl < a);
4068         } else if (_substrcmp(*av, "list") == 0) {
4069                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4070                 do {
4071                         table_list(xent.tbl, is_all);
4072                 } while (++xent.tbl < a);
4073         } else
4074                 errx(EX_USAGE, "invalid table command %s", *av);
4075 }
4076
4077 static void
4078 table_fill_xentry(char *arg, ipfw_table_xentry *xent)
4079 {
4080         int addrlen, mask, masklen, type;
4081         struct in6_addr *paddr;
4082         uint32_t *pkey;
4083         char *p;
4084         uint32_t key;
4085
4086         mask = 0;
4087         type = 0;
4088         addrlen = 0;
4089         masklen = 0;
4090
4091         /*
4092          * Let's try to guess type by agrument.
4093          * Possible types:
4094          * 1) IPv4[/mask]
4095          * 2) IPv6[/mask]
4096          * 3) interface name
4097          * 4) port, uid/gid or other u32 key (base 10 format)
4098          * 5) hostname
4099          */
4100         paddr = &xent->k.addr6;
4101         if (ishexnumber(*arg) != 0 || *arg == ':') {
4102                 /* Remove / if exists */
4103                 if ((p = strchr(arg, '/')) != NULL) {
4104                         *p = '\0';
4105                         mask = atoi(p + 1);
4106                 }
4107
4108                 if (inet_pton(AF_INET, arg, paddr) == 1) {
4109                         if (p != NULL && mask > 32)
4110                                 errx(EX_DATAERR, "bad IPv4 mask width: %s",
4111                                     p + 1);
4112
4113                         type = IPFW_TABLE_CIDR;
4114                         masklen = p ? mask : 32;
4115                         addrlen = sizeof(struct in_addr);
4116                 } else if (inet_pton(AF_INET6, arg, paddr) == 1) {
4117                         if (IN6_IS_ADDR_V4COMPAT(paddr))
4118                                 errx(EX_DATAERR,
4119                                     "Use IPv4 instead of v4-compatible");
4120                         if (p != NULL && mask > 128)
4121                                 errx(EX_DATAERR, "bad IPv6 mask width: %s",
4122                                     p + 1);
4123
4124                         type = IPFW_TABLE_CIDR;
4125                         masklen = p ? mask : 128;
4126                         addrlen = sizeof(struct in6_addr);
4127                 } else {
4128                         /* Port or any other key */
4129                         key = strtol(arg, &p, 10);
4130                         /* Skip non-base 10 entries like 'fa1' */
4131                         if (p != arg) {
4132                                 pkey = (uint32_t *)paddr;
4133                                 *pkey = htonl(key);
4134                                 type = IPFW_TABLE_CIDR;
4135                                 addrlen = sizeof(uint32_t);
4136                         }
4137                 }
4138         }
4139
4140         if (type == 0 && strchr(arg, '.') == NULL) {
4141                 /* Assume interface name. Copy significant data only */
4142                 mask = MIN(strlen(arg), IF_NAMESIZE - 1);
4143                 memcpy(xent->k.iface, arg, mask);
4144                 /* Set mask to exact match */
4145                 masklen = 8 * IF_NAMESIZE;
4146                 type = IPFW_TABLE_INTERFACE;
4147                 addrlen = IF_NAMESIZE;
4148         }
4149
4150         if (type == 0) {
4151                 if (lookup_host(arg, (struct in_addr *)paddr) != 0)
4152                         errx(EX_NOHOST, "hostname ``%s'' unknown", arg);
4153
4154                 masklen = 32;
4155                 type = IPFW_TABLE_CIDR;
4156                 addrlen = sizeof(struct in_addr);
4157         }
4158
4159         xent->type = type;
4160         xent->masklen = masklen;
4161         xent->len = offsetof(ipfw_table_xentry, k) + addrlen;
4162 }
4163
4164 static void
4165 table_list(uint16_t num, int need_header)
4166 {
4167         ipfw_xtable *tbl;
4168         ipfw_table_xentry *xent;
4169         socklen_t l;
4170         uint32_t *a, sz, tval;
4171         char tbuf[128];
4172         struct in6_addr *addr6;
4173         ip_fw3_opheader *op3;
4174
4175         /* Prepend value with IP_FW3 header */
4176         l = sizeof(ip_fw3_opheader) + sizeof(uint32_t);
4177         op3 = alloca(l);
4178         /* Zero reserved fields */
4179         memset(op3, 0, sizeof(ip_fw3_opheader));
4180         a = (uint32_t *)(op3 + 1);
4181         *a = num;
4182         op3->opcode = IP_FW_TABLE_XGETSIZE;
4183         if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0)
4184                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)");
4185
4186         /* If a is zero we have nothing to do, the table is empty. */
4187         if (*a == 0)
4188                 return;
4189
4190         l = *a;
4191         tbl = safe_calloc(1, l);
4192         tbl->opheader.opcode = IP_FW_TABLE_XLIST;
4193         tbl->tbl = num;
4194         if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0)
4195                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)");
4196         if (tbl->cnt && need_header)
4197                 printf("---table(%d)---\n", tbl->tbl);
4198         sz = tbl->size - sizeof(ipfw_xtable);
4199         xent = &tbl->xent[0];
4200         while (sz > 0) {
4201                 switch (tbl->type) {
4202                 case IPFW_TABLE_CIDR:
4203                         /* IPv4 or IPv6 prefixes */
4204                         tval = xent->value;
4205                         addr6 = &xent->k.addr6;
4206
4207
4208                         if (IN6_IS_ADDR_V4COMPAT(addr6)) {
4209                                 /* IPv4 address */
4210                                 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf));
4211                         } else {
4212                                 /* IPv6 address */
4213                                 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf));
4214                         }
4215
4216                         if (co.do_value_as_ip) {
4217                                 tval = htonl(tval);
4218                                 printf("%s/%u %s\n", tbuf, xent->masklen,
4219                                     inet_ntoa(*(struct in_addr *)&tval));
4220                         } else
4221                                 printf("%s/%u %u\n", tbuf, xent->masklen, tval);
4222                         break;
4223                 case IPFW_TABLE_INTERFACE:
4224                         /* Interface names */
4225                         tval = xent->value;
4226                         if (co.do_value_as_ip) {
4227                                 tval = htonl(tval);
4228                                 printf("%s %s\n", xent->k.iface,
4229                                     inet_ntoa(*(struct in_addr *)&tval));
4230                         } else
4231                                 printf("%s %u\n", xent->k.iface, tval);
4232                 }
4233
4234                 if (sz < xent->len)
4235                         break;
4236                 sz -= xent->len;
4237                 xent = (void *)xent + xent->len;
4238         }
4239
4240         free(tbl);
4241 }