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/socket.h>
  25 #include <sys/sockio.h>
  26 #include <sys/sysctl.h>
  27
  28 #include "ipfw2.h"
  29
  30 #include <ctype.h>
  31 #include <err.h>
  32 #include <errno.h>
  33 #include <grp.h>
  34 #include <netdb.h>
  35 #include <pwd.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <time.h>       /* ctime */
  41 #include <timeconv.h>   /* _long_to_time */
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44
  45 #include <net/ethernet.h>
  46 #include <net/if.h>             /* only IFNAMSIZ */
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>   /* only n_short, n_long */
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <netinet/ip_fw.h>
  52 #include <netinet/tcp.h>
  53 #include <arpa/inet.h>
  54
  55 struct cmdline_opts co; /* global options */
  56
  57 int resvd_set_number = RESVD_SET;
  58
  59 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  60         if (!ac)                                                        \
  61                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  62         if (_substrcmp(*av, "tablearg") == 0) {                         \
  63                 arg = IP_FW_TABLEARG;                                   \
  64                 break;                                                  \
  65         }                                                               \
  66                                                                         \
  67         {                                                               \
  68         long val;                                                       \
  69         char *end;                                                      \
  70                                                                         \
  71         val = strtol(*av, &end, 10);                                    \
  72                                                                         \
  73         if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \
  74                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  75                     match_value(s_x, tok), *av);                        \
  76                                                                         \
  77         if (errno == ERANGE || val < min || val > max)                  \
  78                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  79                     match_value(s_x, tok), min, max, *av);              \
  80                                                                         \
  81         if (val == IP_FW_TABLEARG)                                      \
  82                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  83                     match_value(s_x, tok), *av);                        \
  84         arg = val;                                                      \
  85         }                                                               \
  86 } while (0)
  87
  88 static void
  89 PRINT_UINT_ARG(const char *str, uint32_t arg)
  90 {
  91         if (str != NULL)
  92                 printf("%s",str);
  93         if (arg == IP_FW_TABLEARG)
  94                 printf("tablearg");
  95         else
  96                 printf("%u", arg);
  97 }
  98
  99 static struct _s_x f_tcpflags[] = {
 100         { "syn", TH_SYN },
 101         { "fin", TH_FIN },
 102         { "ack", TH_ACK },
 103         { "psh", TH_PUSH },
 104         { "rst", TH_RST },
 105         { "urg", TH_URG },
 106         { "tcp flag", 0 },
 107         { NULL, 0 }
 108 };
 109
 110 static struct _s_x f_tcpopts[] = {
 111         { "mss",        IP_FW_TCPOPT_MSS },
 112         { "maxseg",     IP_FW_TCPOPT_MSS },
 113         { "window",     IP_FW_TCPOPT_WINDOW },
 114         { "sack",       IP_FW_TCPOPT_SACK },
 115         { "ts",         IP_FW_TCPOPT_TS },
 116         { "timestamp",  IP_FW_TCPOPT_TS },
 117         { "cc",         IP_FW_TCPOPT_CC },
 118         { "tcp option", 0 },
 119         { NULL, 0 }
 120 };
 121
 122 /*
 123  * IP options span the range 0 to 255 so we need to remap them
 124  * (though in fact only the low 5 bits are significant).
 125  */
 126 static struct _s_x f_ipopts[] = {
 127         { "ssrr",       IP_FW_IPOPT_SSRR},
 128         { "lsrr",       IP_FW_IPOPT_LSRR},
 129         { "rr",         IP_FW_IPOPT_RR},
 130         { "ts",         IP_FW_IPOPT_TS},
 131         { "ip option",  0 },
 132         { NULL, 0 }
 133 };
 134
 135 static struct _s_x f_iptos[] = {
 136         { "lowdelay",   IPTOS_LOWDELAY},
 137         { "throughput", IPTOS_THROUGHPUT},
 138         { "reliability", IPTOS_RELIABILITY},
 139         { "mincost",    IPTOS_MINCOST},
 140         { "congestion", IPTOS_ECN_CE},
 141         { "ecntransport", IPTOS_ECN_ECT0},
 142         { "ip tos option", 0},
 143         { NULL, 0 }
 144 };
 145
 146 static struct _s_x limit_masks[] = {
 147         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 148         {"src-addr",    DYN_SRC_ADDR},
 149         {"src-port",    DYN_SRC_PORT},
 150         {"dst-addr",    DYN_DST_ADDR},
 151         {"dst-port",    DYN_DST_PORT},
 152         {NULL,          0}
 153 };
 154
 155 /*
 156  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 157  * This is only used in this code.
 158  */
 159 #define IPPROTO_ETHERTYPE       0x1000
 160 static struct _s_x ether_types[] = {
 161     /*
 162      * Note, we cannot use "-:&/" in the names because they are field
 163      * separators in the type specifications. Also, we use s = NULL as
 164      * end-delimiter, because a type of 0 can be legal.
 165      */
 166         { "ip",         0x0800 },
 167         { "ipv4",       0x0800 },
 168         { "ipv6",       0x86dd },
 169         { "arp",        0x0806 },
 170         { "rarp",       0x8035 },
 171         { "vlan",       0x8100 },
 172         { "loop",       0x9000 },
 173         { "trail",      0x1000 },
 174         { "at",         0x809b },
 175         { "atalk",      0x809b },
 176         { "aarp",       0x80f3 },
 177         { "pppoe_disc", 0x8863 },
 178         { "pppoe_sess", 0x8864 },
 179         { "ipx_8022",   0x00E0 },
 180         { "ipx_8023",   0x0000 },
 181         { "ipx_ii",     0x8137 },
 182         { "ipx_snap",   0x8137 },
 183         { "ipx",        0x8137 },
 184         { "ns",         0x0600 },
 185         { NULL,         0 }
 186 };
 187
 188
 189 static struct _s_x rule_actions[] = {
 190         { "accept",             TOK_ACCEPT },
 191         { "pass",               TOK_ACCEPT },
 192         { "allow",              TOK_ACCEPT },
 193         { "permit",             TOK_ACCEPT },
 194         { "count",              TOK_COUNT },
 195         { "pipe",               TOK_PIPE },
 196         { "queue",              TOK_QUEUE },
 197         { "divert",             TOK_DIVERT },
 198         { "tee",                TOK_TEE },
 199         { "netgraph",           TOK_NETGRAPH },
 200         { "ngtee",              TOK_NGTEE },
 201         { "fwd",                TOK_FORWARD },
 202         { "forward",            TOK_FORWARD },
 203         { "skipto",             TOK_SKIPTO },
 204         { "deny",               TOK_DENY },
 205         { "drop",               TOK_DENY },
 206         { "reject",             TOK_REJECT },
 207         { "reset6",             TOK_RESET6 },
 208         { "reset",              TOK_RESET },
 209         { "unreach6",           TOK_UNREACH6 },
 210         { "unreach",            TOK_UNREACH },
 211         { "check-state",        TOK_CHECKSTATE },
 212         { "//",                 TOK_COMMENT },
 213         { "nat",                TOK_NAT },
 214         { "setfib",             TOK_SETFIB },
 215         { NULL, 0 }     /* terminator */
 216 };
 217
 218 static struct _s_x rule_action_params[] = {
 219         { "altq",               TOK_ALTQ },
 220         { "log",                TOK_LOG },
 221         { "tag",                TOK_TAG },
 222         { "untag",              TOK_UNTAG },
 223         { NULL, 0 }     /* terminator */
 224 };
 225
 226 static struct _s_x rule_options[] = {
 227         { "tagged",             TOK_TAGGED },
 228         { "uid",                TOK_UID },
 229         { "gid",                TOK_GID },
 230         { "jail",               TOK_JAIL },
 231         { "in",                 TOK_IN },
 232         { "limit",              TOK_LIMIT },
 233         { "keep-state",         TOK_KEEPSTATE },
 234         { "bridged",            TOK_LAYER2 },
 235         { "layer2",             TOK_LAYER2 },
 236         { "out",                TOK_OUT },
 237         { "diverted",           TOK_DIVERTED },
 238         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 239         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 240         { "xmit",               TOK_XMIT },
 241         { "recv",               TOK_RECV },
 242         { "via",                TOK_VIA },
 243         { "fragment",           TOK_FRAG },
 244         { "frag",               TOK_FRAG },
 245         { "fib",                TOK_FIB },
 246         { "ipoptions",          TOK_IPOPTS },
 247         { "ipopts",             TOK_IPOPTS },
 248         { "iplen",              TOK_IPLEN },
 249         { "ipid",               TOK_IPID },
 250         { "ipprecedence",       TOK_IPPRECEDENCE },
 251         { "iptos",              TOK_IPTOS },
 252         { "ipttl",              TOK_IPTTL },
 253         { "ipversion",          TOK_IPVER },
 254         { "ipver",              TOK_IPVER },
 255         { "estab",              TOK_ESTAB },
 256         { "established",        TOK_ESTAB },
 257         { "setup",              TOK_SETUP },
 258         { "tcpdatalen",         TOK_TCPDATALEN },
 259         { "tcpflags",           TOK_TCPFLAGS },
 260         { "tcpflgs",            TOK_TCPFLAGS },
 261         { "tcpoptions",         TOK_TCPOPTS },
 262         { "tcpopts",            TOK_TCPOPTS },
 263         { "tcpseq",             TOK_TCPSEQ },
 264         { "tcpack",             TOK_TCPACK },
 265         { "tcpwin",             TOK_TCPWIN },
 266         { "icmptype",           TOK_ICMPTYPES },
 267         { "icmptypes",          TOK_ICMPTYPES },
 268         { "dst-ip",             TOK_DSTIP },
 269         { "src-ip",             TOK_SRCIP },
 270         { "dst-port",           TOK_DSTPORT },
 271         { "src-port",           TOK_SRCPORT },
 272         { "proto",              TOK_PROTO },
 273         { "MAC",                TOK_MAC },
 274         { "mac",                TOK_MAC },
 275         { "mac-type",           TOK_MACTYPE },
 276         { "verrevpath",         TOK_VERREVPATH },
 277         { "versrcreach",        TOK_VERSRCREACH },
 278         { "antispoof",          TOK_ANTISPOOF },
 279         { "ipsec",              TOK_IPSEC },
 280         { "icmp6type",          TOK_ICMP6TYPES },
 281         { "icmp6types",         TOK_ICMP6TYPES },
 282         { "ext6hdr",            TOK_EXT6HDR},
 283         { "flow-id",            TOK_FLOWID},
 284         { "ipv6",               TOK_IPV6},
 285         { "ip6",                TOK_IPV6},
 286         { "ipv4",               TOK_IPV4},
 287         { "ip4",                TOK_IPV4},
 288         { "dst-ipv6",           TOK_DSTIP6},
 289         { "dst-ip6",            TOK_DSTIP6},
 290         { "src-ipv6",           TOK_SRCIP6},
 291         { "src-ip6",            TOK_SRCIP6},
 292         { "//",                 TOK_COMMENT },
 293
 294         { "not",                TOK_NOT },              /* pseudo option */
 295         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 296         { "or",                 TOK_OR },               /* pseudo option */
 297         { "|", /* escape */     TOK_OR },               /* pseudo option */
 298         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 299         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 300         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 301         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 302         { NULL, 0 }     /* terminator */
 303 };
 304
 305 /*
 306  * The following is used to generate a printable argument for
 307  * 64-bit numbers, irrespective of platform alignment and bit size.
 308  * Because all the printf in this program use %llu as a format,
 309  * we just return an unsigned long long, which is larger than
 310  * we need in certain cases, but saves the hassle of using
 311  * PRIu64 as a format specifier.
 312  * We don't care about inlining, this is not performance critical code.
 313  */
 314 unsigned long long
 315 align_uint64(const uint64_t *pll)
 316 {
 317         uint64_t ret;
 318
 319         bcopy (pll, &ret, sizeof(ret));
 320         return ret;
 321 }
 322
 323 void *
 324 safe_calloc(size_t number, size_t size)
 325 {
 326         void *ret = calloc(number, size);
 327
 328         if (ret == NULL)
 329                 err(EX_OSERR, "calloc");
 330         return ret;
 331 }
 332
 333 void *
 334 safe_realloc(void *ptr, size_t size)
 335 {
 336         void *ret = realloc(ptr, size);
 337
 338         if (ret == NULL)
 339                 err(EX_OSERR, "realloc");
 340         return ret;
 341 }
 342
 343 /*
 344  * conditionally runs the command.
 345  */
 346 int
 347 do_cmd(int optname, void *optval, uintptr_t optlen)
 348 {
 349         static int s = -1;      /* the socket */
 350         int i;
 351
 352         if (co.test_only)
 353                 return 0;
 354
 355         if (s == -1)
 356                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 357         if (s < 0)
 358                 err(EX_UNAVAILABLE, "socket");
 359
 360         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 361             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 362             optname == IP_FW_TABLE_GETSIZE ||
 363             optname == IP_FW_NAT_GET_CONFIG ||
 364             optname == IP_FW_NAT_GET_LOG)
 365                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 366                         (socklen_t *)optlen);
 367         else
 368                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 369         return i;
 370 }
 371
 372 /**
 373  * match_token takes a table and a string, returns the value associated
 374  * with the string (-1 in case of failure).
 375  */
 376 int
 377 match_token(struct _s_x *table, char *string)
 378 {
 379         struct _s_x *pt;
 380         uint i = strlen(string);
 381
 382         for (pt = table ; i && pt->s != NULL ; pt++)
 383                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 384                         return pt->x;
 385         return -1;
 386 }
 387
 388 /**
 389  * match_value takes a table and a value, returns the string associated
 390  * with the value (NULL in case of failure).
 391  */
 392 char const *
 393 match_value(struct _s_x *p, int value)
 394 {
 395         for (; p->s != NULL; p++)
 396                 if (p->x == value)
 397                         return p->s;
 398         return NULL;
 399 }
 400
 401 /*
 402  * _substrcmp takes two strings and returns 1 if they do not match,
 403  * and 0 if they match exactly or the first string is a sub-string
 404  * of the second.  A warning is printed to stderr in the case that the
 405  * first string is a sub-string of the second.
 406  *
 407  * This function will be removed in the future through the usual
 408  * deprecation process.
 409  */
 410 int
 411 _substrcmp(const char *str1, const char* str2)
 412 {
 413
 414         if (strncmp(str1, str2, strlen(str1)) != 0)
 415                 return 1;
 416
 417         if (strlen(str1) != strlen(str2))
 418                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 419                     str1, str2);
 420         return 0;
 421 }
 422
 423 /*
 424  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 425  * and 0 if they match exactly or the second string is a sub-string
 426  * of the first.  A warning is printed to stderr in the case that the
 427  * first string does not match the third.
 428  *
 429  * This function exists to warn about the bizzare construction
 430  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 431  * for "bytes".  The problem is that in addition to accepting "by",
 432  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 433  * other string beginning with "by".
 434  *
 435  * This function will be removed in the future through the usual
 436  * deprecation process.
 437  */
 438 int
 439 _substrcmp2(const char *str1, const char* str2, const char* str3)
 440 {
 441
 442         if (strncmp(str1, str2, strlen(str2)) != 0)
 443                 return 1;
 444
 445         if (strcmp(str1, str3) != 0)
 446                 warnx("DEPRECATED: '%s' matched '%s'",
 447                     str1, str3);
 448         return 0;
 449 }
 450
 451 /*
 452  * prints one port, symbolic or numeric
 453  */
 454 static void
 455 print_port(int proto, uint16_t port)
 456 {
 457
 458         if (proto == IPPROTO_ETHERTYPE) {
 459                 char const *s;
 460
 461                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 462                         printf("%s", s);
 463                 else
 464                         printf("0x%04x", port);
 465         } else {
 466                 struct servent *se = NULL;
 467                 if (co.do_resolv) {
 468                         struct protoent *pe = getprotobynumber(proto);
 469
 470                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 471                 }
 472                 if (se)
 473                         printf("%s", se->s_name);
 474                 else
 475                         printf("%d", port);
 476         }
 477 }
 478
 479 static struct _s_x _port_name[] = {
 480         {"dst-port",    O_IP_DSTPORT},
 481         {"src-port",    O_IP_SRCPORT},
 482         {"ipid",        O_IPID},
 483         {"iplen",       O_IPLEN},
 484         {"ipttl",       O_IPTTL},
 485         {"mac-type",    O_MAC_TYPE},
 486         {"tcpdatalen",  O_TCPDATALEN},
 487         {"tagged",      O_TAGGED},
 488         {NULL,          0}
 489 };
 490
 491 /*
 492  * Print the values in a list 16-bit items of the types above.
 493  * XXX todo: add support for mask.
 494  */
 495 static void
 496 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 497 {
 498         uint16_t *p = cmd->ports;
 499         int i;
 500         char const *sep;
 501
 502         if (opcode != 0) {
 503                 sep = match_value(_port_name, opcode);
 504                 if (sep == NULL)
 505                         sep = "???";
 506                 printf (" %s", sep);
 507         }
 508         sep = " ";
 509         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 510                 printf(sep);
 511                 print_port(proto, p[0]);
 512                 if (p[0] != p[1]) {
 513                         printf("-");
 514                         print_port(proto, p[1]);
 515                 }
 516                 sep = ",";
 517         }
 518 }
 519
 520 /*
 521  * Like strtol, but also translates service names into port numbers
 522  * for some protocols.
 523  * In particular:
 524  *      proto == -1 disables the protocol check;
 525  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 526  *      proto == <some value in /etc/protocols> matches the values there.
 527  * Returns *end == s in case the parameter is not found.
 528  */
 529 static int
 530 strtoport(char *s, char **end, int base, int proto)
 531 {
 532         char *p, *buf;
 533         char *s1;
 534         int i;
 535
 536         *end = s;               /* default - not found */
 537         if (*s == '\0')
 538                 return 0;       /* not found */
 539
 540         if (isdigit(*s))
 541                 return strtol(s, end, base);
 542
 543         /*
 544          * find separator. '\\' escapes the next char.
 545          */
 546         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 547                 if (*s1 == '\\' && s1[1] != '\0')
 548                         s1++;
 549
 550         buf = safe_calloc(s1 - s + 1, 1);
 551
 552         /*
 553          * copy into a buffer skipping backslashes
 554          */
 555         for (p = s, i = 0; p != s1 ; p++)
 556                 if (*p != '\\')
 557                         buf[i++] = *p;
 558         buf[i++] = '\0';
 559
 560         if (proto == IPPROTO_ETHERTYPE) {
 561                 i = match_token(ether_types, buf);
 562                 free(buf);
 563                 if (i != -1) {  /* found */
 564                         *end = s1;
 565                         return i;
 566                 }
 567         } else {
 568                 struct protoent *pe = NULL;
 569                 struct servent *se;
 570
 571                 if (proto != 0)
 572                         pe = getprotobynumber(proto);
 573                 setservent(1);
 574                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 575                 free(buf);
 576                 if (se != NULL) {
 577                         *end = s1;
 578                         return ntohs(se->s_port);
 579                 }
 580         }
 581         return 0;       /* not found */
 582 }
 583
 584 /*
 585  * Fill the body of the command with the list of port ranges.
 586  */
 587 static int
 588 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 589 {
 590         uint16_t a, b, *p = cmd->ports;
 591         int i = 0;
 592         char *s = av;
 593
 594         while (*s) {
 595                 a = strtoport(av, &s, 0, proto);
 596                 if (s == av)                    /* empty or invalid argument */
 597                         return (0);
 598
 599                 switch (*s) {
 600                 case '-':                       /* a range */
 601                         av = s + 1;
 602                         b = strtoport(av, &s, 0, proto);
 603                         /* Reject expressions like '1-abc' or '1-2-3'. */
 604                         if (s == av || (*s != ',' && *s != '\0'))
 605                                 return (0);
 606                         p[0] = a;
 607                         p[1] = b;
 608                         break;
 609                 case ',':                       /* comma separated list */
 610                 case '\0':
 611                         p[0] = p[1] = a;
 612                         break;
 613                 default:
 614                         warnx("port list: invalid separator <%c> in <%s>",
 615                                 *s, av);
 616                         return (0);
 617                 }
 618
 619                 i++;
 620                 p += 2;
 621                 av = s + 1;
 622         }
 623         if (i > 0) {
 624                 if (i + 1 > F_LEN_MASK)
 625                         errx(EX_DATAERR, "too many ports/ranges\n");
 626                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 627         }
 628         return (i);
 629 }
 630
 631 static struct _s_x icmpcodes[] = {
 632       { "net",                  ICMP_UNREACH_NET },
 633       { "host",                 ICMP_UNREACH_HOST },
 634       { "protocol",             ICMP_UNREACH_PROTOCOL },
 635       { "port",                 ICMP_UNREACH_PORT },
 636       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 637       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 638       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 639       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 640       { "isolated",             ICMP_UNREACH_ISOLATED },
 641       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 642       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 643       { "tosnet",               ICMP_UNREACH_TOSNET },
 644       { "toshost",              ICMP_UNREACH_TOSHOST },
 645       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 646       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 647       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 648       { NULL, 0 }
 649 };
 650
 651 static void
 652 fill_reject_code(u_short *codep, char *str)
 653 {
 654         int val;
 655         char *s;
 656
 657         val = strtoul(str, &s, 0);
 658         if (s == str || *s != '\0' || val >= 0x100)
 659                 val = match_token(icmpcodes, str);
 660         if (val < 0)
 661                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 662         *codep = val;
 663         return;
 664 }
 665
 666 static void
 667 print_reject_code(uint16_t code)
 668 {
 669         char const *s = match_value(icmpcodes, code);
 670
 671         if (s != NULL)
 672                 printf("unreach %s", s);
 673         else
 674                 printf("unreach %u", code);
 675 }
 676
 677 /*
 678  * Returns the number of bits set (from left) in a contiguous bitmask,
 679  * or -1 if the mask is not contiguous.
 680  * XXX this needs a proper fix.
 681  * This effectively works on masks in big-endian (network) format.
 682  * when compiled on little endian architectures.
 683  *
 684  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 685  * the first bit on the wire is bit 0 of the first byte.
 686  * len is the max length in bits.
 687  */
 688 int
 689 contigmask(uint8_t *p, int len)
 690 {
 691         int i, n;
 692
 693         for (i=0; i<len ; i++)
 694                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 695                         break;
 696         for (n=i+1; n < len; n++)
 697                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 698                         return -1; /* mask not contiguous */
 699         return i;
 700 }
 701
 702 /*
 703  * print flags set/clear in the two bitmasks passed as parameters.
 704  * There is a specialized check for f_tcpflags.
 705  */
 706 static void
 707 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 708 {
 709         char const *comma = "";
 710         int i;
 711         uint8_t set = cmd->arg1 & 0xff;
 712         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 713
 714         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 715                 printf(" setup");
 716                 return;
 717         }
 718
 719         printf(" %s ", name);
 720         for (i=0; list[i].x != 0; i++) {
 721                 if (set & list[i].x) {
 722                         set &= ~list[i].x;
 723                         printf("%s%s", comma, list[i].s);
 724                         comma = ",";
 725                 }
 726                 if (clear & list[i].x) {
 727                         clear &= ~list[i].x;
 728                         printf("%s!%s", comma, list[i].s);
 729                         comma = ",";
 730                 }
 731         }
 732 }
 733
 734 /*
 735  * Print the ip address contained in a command.
 736  */
 737 static void
 738 print_ip(ipfw_insn_ip *cmd, char const *s)
 739 {
 740         struct hostent *he = NULL;
 741         int len = F_LEN((ipfw_insn *)cmd);
 742         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 743
 744         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 745
 746         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 747                 printf("me");
 748                 return;
 749         }
 750         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 751             cmd->o.opcode == O_IP_DST_LOOKUP) {
 752                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 753                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 754                         printf(",%u", *a);
 755                 printf(")");
 756                 return;
 757         }
 758         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 759                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 760                 int i, j;
 761                 char comma = '{';
 762
 763                 x = cmd->o.arg1 - 1;
 764                 x = htonl( ~x );
 765                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 766                 printf("%s/%d", inet_ntoa(cmd->addr),
 767                         contigmask((uint8_t *)&x, 32));
 768                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 769                 x &= 0xff; /* base */
 770                 /*
 771                  * Print bits and ranges.
 772                  * Locate first bit set (i), then locate first bit unset (j).
 773                  * If we have 3+ consecutive bits set, then print them as a
 774                  * range, otherwise only print the initial bit and rescan.
 775                  */
 776                 for (i=0; i < cmd->o.arg1; i++)
 777                         if (map[i/32] & (1<<(i & 31))) {
 778                                 for (j=i+1; j < cmd->o.arg1; j++)
 779                                         if (!(map[ j/32] & (1<<(j & 31))))
 780                                                 break;
 781                                 printf("%c%d", comma, i+x);
 782                                 if (j>i+2) { /* range has at least 3 elements */
 783                                         printf("-%d", j-1+x);
 784                                         i = j-1;
 785                                 }
 786                                 comma = ',';
 787                         }
 788                 printf("}");
 789                 return;
 790         }
 791         /*
 792          * len == 2 indicates a single IP, whereas lists of 1 or more
 793          * addr/mask pairs have len = (2n+1). We convert len to n so we
 794          * use that to count the number of entries.
 795          */
 796     for (len = len / 2; len > 0; len--, a += 2) {
 797         int mb =        /* mask length */
 798             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 799                 32 : contigmask((uint8_t *)&(a[1]), 32);
 800         if (mb == 32 && co.do_resolv)
 801                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 802         if (he != NULL)         /* resolved to name */
 803                 printf("%s", he->h_name);
 804         else if (mb == 0)       /* any */
 805                 printf("any");
 806         else {          /* numeric IP followed by some kind of mask */
 807                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 808                 if (mb < 0)
 809                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 810                 else if (mb < 32)
 811                         printf("/%d", mb);
 812         }
 813         if (len > 1)
 814                 printf(",");
 815     }
 816 }
 817
 818 /*
 819  * prints a MAC address/mask pair
 820  */
 821 static void
 822 print_mac(uint8_t *addr, uint8_t *mask)
 823 {
 824         int l = contigmask(mask, 48);
 825
 826         if (l == 0)
 827                 printf(" any");
 828         else {
 829                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 830                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 831                 if (l == -1)
 832                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 833                             mask[0], mask[1], mask[2],
 834                             mask[3], mask[4], mask[5]);
 835                 else if (l < 48)
 836                         printf("/%d", l);
 837         }
 838 }
 839
 840 static void
 841 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 842 {
 843         uint8_t type;
 844
 845         cmd->d[0] = 0;
 846         while (*av) {
 847                 if (*av == ',')
 848                         av++;
 849
 850                 type = strtoul(av, &av, 0);
 851
 852                 if (*av != ',' && *av != '\0')
 853                         errx(EX_DATAERR, "invalid ICMP type");
 854
 855                 if (type > 31)
 856                         errx(EX_DATAERR, "ICMP type out of range");
 857
 858                 cmd->d[0] |= 1 << type;
 859         }
 860         cmd->o.opcode = O_ICMPTYPE;
 861         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 862 }
 863
 864 static void
 865 print_icmptypes(ipfw_insn_u32 *cmd)
 866 {
 867         int i;
 868         char sep= ' ';
 869
 870         printf(" icmptypes");
 871         for (i = 0; i < 32; i++) {
 872                 if ( (cmd->d[0] & (1 << (i))) == 0)
 873                         continue;
 874                 printf("%c%d", sep, i);
 875                 sep = ',';
 876         }
 877 }
 878
 879 /*
 880  * show_ipfw() prints the body of an ipfw rule.
 881  * Because the standard rule has at least proto src_ip dst_ip, we use
 882  * a helper function to produce these entries if not provided explicitly.
 883  * The first argument is the list of fields we have, the second is
 884  * the list of fields we want to be printed.
 885  *
 886  * Special cases if we have provided a MAC header:
 887  *   + if the rule does not contain IP addresses/ports, do not print them;
 888  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 889  *
 890  * Once we have 'have_options', IP header fields are printed as options.
 891  */
 892 #define HAVE_PROTO      0x0001
 893 #define HAVE_SRCIP      0x0002
 894 #define HAVE_DSTIP      0x0004
 895 #define HAVE_PROTO4     0x0008
 896 #define HAVE_PROTO6     0x0010
 897 #define HAVE_OPTIONS    0x8000
 898
 899 #define HAVE_IP         (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
 900 static void
 901 show_prerequisites(int *flags, int want, int cmd __unused)
 902 {
 903         if (co.comment_only)
 904                 return;
 905         if ( (*flags & HAVE_IP) == HAVE_IP)
 906                 *flags |= HAVE_OPTIONS;
 907
 908         if ( !(*flags & HAVE_OPTIONS)) {
 909                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 910                         if ( (*flags & HAVE_PROTO4))
 911                                 printf(" ip4");
 912                         else if ( (*flags & HAVE_PROTO6))
 913                                 printf(" ip6");
 914                         else
 915                                 printf(" ip");
 916                 }
 917                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 918                         printf(" from any");
 919                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 920                         printf(" to any");
 921         }
 922         *flags |= want;
 923 }
 924
 925 static void
 926 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 927 {
 928         static int twidth = 0;
 929         int l;
 930         ipfw_insn *cmd, *tagptr = NULL;
 931         const char *comment = NULL;     /* ptr to comment if we have one */
 932         int proto = 0;          /* default */
 933         int flags = 0;  /* prerequisites */
 934         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 935         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 936         int or_block = 0;       /* we are in an or block */
 937         uint32_t set_disable;
 938
 939         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 940
 941         if (set_disable & (1 << rule->set)) { /* disabled */
 942                 if (!co.show_sets)
 943                         return;
 944                 else
 945                         printf("# DISABLED ");
 946         }
 947         printf("%05u ", rule->rulenum);
 948
 949         if (pcwidth>0 || bcwidth>0)
 950                 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt),
 951                     bcwidth, align_uint64(&rule->bcnt));
 952
 953         if (co.do_time == 2)
 954                 printf("%10u ", rule->timestamp);
 955         else if (co.do_time == 1) {
 956                 char timestr[30];
 957                 time_t t = (time_t)0;
 958
 959                 if (twidth == 0) {
 960                         strcpy(timestr, ctime(&t));
 961                         *strchr(timestr, '\n') = '\0';
 962                         twidth = strlen(timestr);
 963                 }
 964                 if (rule->timestamp) {
 965                         t = _long_to_time(rule->timestamp);
 966
 967                         strcpy(timestr, ctime(&t));
 968                         *strchr(timestr, '\n') = '\0';
 969                         printf("%s ", timestr);
 970                 } else {
 971                         printf("%*s", twidth, " ");
 972                 }
 973         }
 974
 975         if (co.show_sets)
 976                 printf("set %d ", rule->set);
 977
 978         /*
 979          * print the optional "match probability"
 980          */
 981         if (rule->cmd_len > 0) {
 982                 cmd = rule->cmd ;
 983                 if (cmd->opcode == O_PROB) {
 984                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 985                         double d = 1.0 * p->d[0];
 986
 987                         d = (d / 0x7fffffff);
 988                         printf("prob %f ", d);
 989                 }
 990         }
 991
 992         /*
 993          * first print actions
 994          */
 995         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 996                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 997                 switch(cmd->opcode) {
 998                 case O_CHECK_STATE:
 999                         printf("check-state");
1000                         flags = HAVE_IP; /* avoid printing anything else */
1001                         break;
1002
1003                 case O_ACCEPT:
1004                         printf("allow");
1005                         break;
1006
1007                 case O_COUNT:
1008                         printf("count");
1009                         break;
1010
1011                 case O_DENY:
1012                         printf("deny");
1013                         break;
1014
1015                 case O_REJECT:
1016                         if (cmd->arg1 == ICMP_REJECT_RST)
1017                                 printf("reset");
1018                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1019                                 printf("reject");
1020                         else
1021                                 print_reject_code(cmd->arg1);
1022                         break;
1023
1024                 case O_UNREACH6:
1025                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1026                                 printf("reset6");
1027                         else
1028                                 print_unreach6_code(cmd->arg1);
1029                         break;
1030
1031                 case O_SKIPTO:
1032                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1033                         break;
1034
1035                 case O_PIPE:
1036                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1037                         break;
1038
1039                 case O_QUEUE:
1040                         PRINT_UINT_ARG("queue ", cmd->arg1);
1041                         break;
1042
1043                 case O_DIVERT:
1044                         PRINT_UINT_ARG("divert ", cmd->arg1);
1045                         break;
1046
1047                 case O_TEE:
1048                         PRINT_UINT_ARG("tee ", cmd->arg1);
1049                         break;
1050
1051                 case O_NETGRAPH:
1052                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1053                         break;
1054
1055                 case O_NGTEE:
1056                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1057                         break;
1058
1059                 case O_FORWARD_IP:
1060                     {
1061                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1062
1063                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1064                                 printf("fwd tablearg");
1065                         } else {
1066                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1067                         }
1068                         if (s->sa.sin_port)
1069                                 printf(",%d", s->sa.sin_port);
1070                     }
1071                         break;
1072
1073                 case O_LOG: /* O_LOG is printed last */
1074                         logptr = (ipfw_insn_log *)cmd;
1075                         break;
1076
1077                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1078                         altqptr = (ipfw_insn_altq *)cmd;
1079                         break;
1080
1081                 case O_TAG:
1082                         tagptr = cmd;
1083                         break;
1084
1085                 case O_NAT:
1086                         PRINT_UINT_ARG("nat ", cmd->arg1);
1087                         break;
1088
1089                 case O_SETFIB:
1090                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1091                         break;
1092
1093                 default:
1094                         printf("** unrecognized action %d len %d ",
1095                                 cmd->opcode, cmd->len);
1096                 }
1097         }
1098         if (logptr) {
1099                 if (logptr->max_log > 0)
1100                         printf(" log logamount %d", logptr->max_log);
1101                 else
1102                         printf(" log");
1103         }
1104         if (altqptr) {
1105                 print_altq_cmd(altqptr);
1106         }
1107         if (tagptr) {
1108                 if (tagptr->len & F_NOT)
1109                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1110                 else
1111                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1112         }
1113
1114         /*
1115          * then print the body.
1116          */
1117         for (l = rule->act_ofs, cmd = rule->cmd ;
1118                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1119                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1120                         continue;
1121                 if (cmd->opcode == O_IP4) {
1122                         flags |= HAVE_PROTO4;
1123                         break;
1124                 } else if (cmd->opcode == O_IP6) {
1125                         flags |= HAVE_PROTO6;
1126                         break;
1127                 }
1128         }
1129         if (rule->_pad & 1) {   /* empty rules before options */
1130                 if (!co.do_compact) {
1131                         show_prerequisites(&flags, HAVE_PROTO, 0);
1132                         printf(" from any to any");
1133                 }
1134                 flags |= HAVE_IP | HAVE_OPTIONS;
1135         }
1136
1137         if (co.comment_only)
1138                 comment = "...";
1139
1140         for (l = rule->act_ofs, cmd = rule->cmd ;
1141                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1142                 /* useful alias */
1143                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1144
1145                 if (co.comment_only) {
1146                         if (cmd->opcode != O_NOP)
1147                                 continue;
1148                         printf(" // %s\n", (char *)(cmd + 1));
1149                         return;
1150                 }
1151
1152                 show_prerequisites(&flags, 0, cmd->opcode);
1153
1154                 switch(cmd->opcode) {
1155                 case O_PROB:
1156                         break;  /* done already */
1157
1158                 case O_PROBE_STATE:
1159                         break; /* no need to print anything here */
1160
1161                 case O_IP_SRC:
1162                 case O_IP_SRC_LOOKUP:
1163                 case O_IP_SRC_MASK:
1164                 case O_IP_SRC_ME:
1165                 case O_IP_SRC_SET:
1166                         show_prerequisites(&flags, HAVE_PROTO, 0);
1167                         if (!(flags & HAVE_SRCIP))
1168                                 printf(" from");
1169                         if ((cmd->len & F_OR) && !or_block)
1170                                 printf(" {");
1171                         print_ip((ipfw_insn_ip *)cmd,
1172                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1173                         flags |= HAVE_SRCIP;
1174                         break;
1175
1176                 case O_IP_DST:
1177                 case O_IP_DST_LOOKUP:
1178                 case O_IP_DST_MASK:
1179                 case O_IP_DST_ME:
1180                 case O_IP_DST_SET:
1181                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1182                         if (!(flags & HAVE_DSTIP))
1183                                 printf(" to");
1184                         if ((cmd->len & F_OR) && !or_block)
1185                                 printf(" {");
1186                         print_ip((ipfw_insn_ip *)cmd,
1187                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1188                         flags |= HAVE_DSTIP;
1189                         break;
1190
1191                 case O_IP6_SRC:
1192                 case O_IP6_SRC_MASK:
1193                 case O_IP6_SRC_ME:
1194                         show_prerequisites(&flags, HAVE_PROTO, 0);
1195                         if (!(flags & HAVE_SRCIP))
1196                                 printf(" from");
1197                         if ((cmd->len & F_OR) && !or_block)
1198                                 printf(" {");
1199                         print_ip6((ipfw_insn_ip6 *)cmd,
1200                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1201                         flags |= HAVE_SRCIP | HAVE_PROTO;
1202                         break;
1203
1204                 case O_IP6_DST:
1205                 case O_IP6_DST_MASK:
1206                 case O_IP6_DST_ME:
1207                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1208                         if (!(flags & HAVE_DSTIP))
1209                                 printf(" to");
1210                         if ((cmd->len & F_OR) && !or_block)
1211                                 printf(" {");
1212                         print_ip6((ipfw_insn_ip6 *)cmd,
1213                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1214                         flags |= HAVE_DSTIP;
1215                         break;
1216
1217                 case O_FLOW6ID:
1218                 print_flow6id( (ipfw_insn_u32 *) cmd );
1219                 flags |= HAVE_OPTIONS;
1220                 break;
1221
1222                 case O_IP_DSTPORT:
1223                         show_prerequisites(&flags, HAVE_IP, 0);
1224                 case O_IP_SRCPORT:
1225                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1226                         if ((cmd->len & F_OR) && !or_block)
1227                                 printf(" {");
1228                         if (cmd->len & F_NOT)
1229                                 printf(" not");
1230                         print_newports((ipfw_insn_u16 *)cmd, proto,
1231                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1232                         break;
1233
1234                 case O_PROTO: {
1235                         struct protoent *pe = NULL;
1236
1237                         if ((cmd->len & F_OR) && !or_block)
1238                                 printf(" {");
1239                         if (cmd->len & F_NOT)
1240                                 printf(" not");
1241                         proto = cmd->arg1;
1242                         pe = getprotobynumber(cmd->arg1);
1243                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1244                             !(flags & HAVE_PROTO))
1245                                 show_prerequisites(&flags,
1246                                     HAVE_IP | HAVE_OPTIONS, 0);
1247                         if (flags & HAVE_OPTIONS)
1248                                 printf(" proto");
1249                         if (pe)
1250                                 printf(" %s", pe->p_name);
1251                         else
1252                                 printf(" %u", cmd->arg1);
1253                         }
1254                         flags |= HAVE_PROTO;
1255                         break;
1256
1257                 default: /*options ... */
1258                         if (!(cmd->len & (F_OR|F_NOT)))
1259                                 if (((cmd->opcode == O_IP6) &&
1260                                     (flags & HAVE_PROTO6)) ||
1261                                     ((cmd->opcode == O_IP4) &&
1262                                     (flags & HAVE_PROTO4)))
1263                                         break;
1264                         show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1265                         if ((cmd->len & F_OR) && !or_block)
1266                                 printf(" {");
1267                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1268                                 printf(" not");
1269                         switch(cmd->opcode) {
1270                         case O_MACADDR2: {
1271                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1272
1273                                 printf(" MAC");
1274                                 print_mac(m->addr, m->mask);
1275                                 print_mac(m->addr + 6, m->mask + 6);
1276                                 }
1277                                 break;
1278
1279                         case O_MAC_TYPE:
1280                                 print_newports((ipfw_insn_u16 *)cmd,
1281                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1282                                 break;
1283
1284
1285                         case O_FRAG:
1286                                 printf(" frag");
1287                                 break;
1288
1289                         case O_FIB:
1290                                 printf(" fib %u", cmd->arg1 );
1291                                 break;
1292
1293                         case O_IN:
1294                                 printf(cmd->len & F_NOT ? " out" : " in");
1295                                 break;
1296
1297                         case O_DIVERTED:
1298                                 switch (cmd->arg1) {
1299                                 case 3:
1300                                         printf(" diverted");
1301                                         break;
1302                                 case 1:
1303                                         printf(" diverted-loopback");
1304                                         break;
1305                                 case 2:
1306                                         printf(" diverted-output");
1307                                         break;
1308                                 default:
1309                                         printf(" diverted-?<%u>", cmd->arg1);
1310                                         break;
1311                                 }
1312                                 break;
1313
1314                         case O_LAYER2:
1315                                 printf(" layer2");
1316                                 break;
1317                         case O_XMIT:
1318                         case O_RECV:
1319                         case O_VIA:
1320                             {
1321                                 char const *s;
1322                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1323
1324                                 if (cmd->opcode == O_XMIT)
1325                                         s = "xmit";
1326                                 else if (cmd->opcode == O_RECV)
1327                                         s = "recv";
1328                                 else /* if (cmd->opcode == O_VIA) */
1329                                         s = "via";
1330                                 if (cmdif->name[0] == '\0')
1331                                         printf(" %s %s", s,
1332                                             inet_ntoa(cmdif->p.ip));
1333                                 else
1334                                         printf(" %s %s", s, cmdif->name);
1335
1336                                 break;
1337                             }
1338                         case O_IPID:
1339                                 if (F_LEN(cmd) == 1)
1340                                     printf(" ipid %u", cmd->arg1 );
1341                                 else
1342                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1343                                         O_IPID);
1344                                 break;
1345
1346                         case O_IPTTL:
1347                                 if (F_LEN(cmd) == 1)
1348                                     printf(" ipttl %u", cmd->arg1 );
1349                                 else
1350                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1351                                         O_IPTTL);
1352                                 break;
1353
1354                         case O_IPVER:
1355                                 printf(" ipver %u", cmd->arg1 );
1356                                 break;
1357
1358                         case O_IPPRECEDENCE:
1359                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1360                                 break;
1361
1362                         case O_IPLEN:
1363                                 if (F_LEN(cmd) == 1)
1364                                     printf(" iplen %u", cmd->arg1 );
1365                                 else
1366                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1367                                         O_IPLEN);
1368                                 break;
1369
1370                         case O_IPOPT:
1371                                 print_flags("ipoptions", cmd, f_ipopts);
1372                                 break;
1373
1374                         case O_IPTOS:
1375                                 print_flags("iptos", cmd, f_iptos);
1376                                 break;
1377
1378                         case O_ICMPTYPE:
1379                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1380                                 break;
1381
1382                         case O_ESTAB:
1383                                 printf(" established");
1384                                 break;
1385
1386                         case O_TCPDATALEN:
1387                                 if (F_LEN(cmd) == 1)
1388                                     printf(" tcpdatalen %u", cmd->arg1 );
1389                                 else
1390                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1391                                         O_TCPDATALEN);
1392                                 break;
1393
1394                         case O_TCPFLAGS:
1395                                 print_flags("tcpflags", cmd, f_tcpflags);
1396                                 break;
1397
1398                         case O_TCPOPTS:
1399                                 print_flags("tcpoptions", cmd, f_tcpopts);
1400                                 break;
1401
1402                         case O_TCPWIN:
1403                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1404                                 break;
1405
1406                         case O_TCPACK:
1407                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1408                                 break;
1409
1410                         case O_TCPSEQ:
1411                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1412                                 break;
1413
1414                         case O_UID:
1415                             {
1416                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1417
1418                                 if (pwd)
1419                                         printf(" uid %s", pwd->pw_name);
1420                                 else
1421                                         printf(" uid %u", cmd32->d[0]);
1422                             }
1423                                 break;
1424
1425                         case O_GID:
1426                             {
1427                                 struct group *grp = getgrgid(cmd32->d[0]);
1428
1429                                 if (grp)
1430                                         printf(" gid %s", grp->gr_name);
1431                                 else
1432                                         printf(" gid %u", cmd32->d[0]);
1433                             }
1434                                 break;
1435
1436                         case O_JAIL:
1437                                 printf(" jail %d", cmd32->d[0]);
1438                                 break;
1439
1440                         case O_VERREVPATH:
1441                                 printf(" verrevpath");
1442                                 break;
1443
1444                         case O_VERSRCREACH:
1445                                 printf(" versrcreach");
1446                                 break;
1447
1448                         case O_ANTISPOOF:
1449                                 printf(" antispoof");
1450                                 break;
1451
1452                         case O_IPSEC:
1453                                 printf(" ipsec");
1454                                 break;
1455
1456                         case O_NOP:
1457                                 comment = (char *)(cmd + 1);
1458                                 break;
1459
1460                         case O_KEEP_STATE:
1461                                 printf(" keep-state");
1462                                 break;
1463
1464                         case O_LIMIT: {
1465                                 struct _s_x *p = limit_masks;
1466                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1467                                 uint8_t x = c->limit_mask;
1468                                 char const *comma = " ";
1469
1470                                 printf(" limit");
1471                                 for (; p->x != 0 ; p++)
1472                                         if ((x & p->x) == p->x) {
1473                                                 x &= ~p->x;
1474                                                 printf("%s%s", comma, p->s);
1475                                                 comma = ",";
1476                                         }
1477                                 PRINT_UINT_ARG(" ", c->conn_limit);
1478                                 break;
1479                         }
1480
1481                         case O_IP6:
1482                                 printf(" ip6");
1483                                 break;
1484
1485                         case O_IP4:
1486                                 printf(" ip4");
1487                                 break;
1488
1489                         case O_ICMP6TYPE:
1490                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1491                                 break;
1492
1493                         case O_EXT_HDR:
1494                                 print_ext6hdr( (ipfw_insn *) cmd );
1495                                 break;
1496
1497                         case O_TAGGED:
1498                                 if (F_LEN(cmd) == 1)
1499                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1500                                 else
1501                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1502                                             O_TAGGED);
1503                                 break;
1504
1505                         default:
1506                                 printf(" [opcode %d len %d]",
1507                                     cmd->opcode, cmd->len);
1508                         }
1509                 }
1510                 if (cmd->len & F_OR) {
1511                         printf(" or");
1512                         or_block = 1;
1513                 } else if (or_block) {
1514                         printf(" }");
1515                         or_block = 0;
1516                 }
1517         }
1518         show_prerequisites(&flags, HAVE_IP, 0);
1519         if (comment)
1520                 printf(" // %s", comment);
1521         printf("\n");
1522 }
1523
1524 static void
1525 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1526 {
1527         struct protoent *pe;
1528         struct in_addr a;
1529         uint16_t rulenum;
1530         char buf[INET6_ADDRSTRLEN];
1531
1532         if (!co.do_expired) {
1533                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1534                         return;
1535         }
1536         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1537         printf("%05d", rulenum);
1538         if (pcwidth>0 || bcwidth>0)
1539             printf(" %*llu %*llu (%ds)", pcwidth,
1540                 align_uint64(&d->pcnt), bcwidth,
1541                 align_uint64(&d->bcnt), d->expire);
1542         switch (d->dyn_type) {
1543         case O_LIMIT_PARENT:
1544                 printf(" PARENT %d", d->count);
1545                 break;
1546         case O_LIMIT:
1547                 printf(" LIMIT");
1548                 break;
1549         case O_KEEP_STATE: /* bidir, no mask */
1550                 printf(" STATE");
1551                 break;
1552         }
1553
1554         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1555                 printf(" %s", pe->p_name);
1556         else
1557                 printf(" proto %u", d->id.proto);
1558
1559         if (d->id.addr_type == 4) {
1560                 a.s_addr = htonl(d->id.src_ip);
1561                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1562
1563                 a.s_addr = htonl(d->id.dst_ip);
1564                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1565         } else if (d->id.addr_type == 6) {
1566                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1567                     sizeof(buf)), d->id.src_port);
1568                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1569                     sizeof(buf)), d->id.dst_port);
1570         } else
1571                 printf(" UNKNOWN <-> UNKNOWN\n");
1572
1573         printf("\n");
1574 }
1575
1576 /*
1577  * This one handles all set-related commands
1578  *      ipfw set { show | enable | disable }
1579  *      ipfw set swap X Y
1580  *      ipfw set move X to Y
1581  *      ipfw set move rule X to Y
1582  */
1583 void
1584 ipfw_sets_handler(int ac, char *av[])
1585 {
1586         uint32_t set_disable, masks[2];
1587         int i, nbytes;
1588         uint16_t rulenum;
1589         uint8_t cmd, new_set;
1590
1591         ac--;
1592         av++;
1593
1594         if (!ac)
1595                 errx(EX_USAGE, "set needs command");
1596         if (_substrcmp(*av, "show") == 0) {
1597                 void *data;
1598                 char const *msg;
1599
1600                 nbytes = sizeof(struct ip_fw);
1601                 data = safe_calloc(1, nbytes);
1602                 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1603                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1604                 bcopy(&((struct ip_fw *)data)->next_rule,
1605                         &set_disable, sizeof(set_disable));
1606
1607                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1608                         if ((set_disable & (1<<i))) {
1609                                 printf("%s %d", msg, i);
1610                                 msg = "";
1611                         }
1612                 msg = (set_disable) ? " enable" : "enable";
1613                 for (i = 0; i < RESVD_SET; i++)
1614                         if (!(set_disable & (1<<i))) {
1615                                 printf("%s %d", msg, i);
1616                                 msg = "";
1617                         }
1618                 printf("\n");
1619         } else if (_substrcmp(*av, "swap") == 0) {
1620                 ac--; av++;
1621                 if (ac != 2)
1622                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1623                 rulenum = atoi(av[0]);
1624                 new_set = atoi(av[1]);
1625                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1626                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1627                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1628                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1629                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1630                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1631         } else if (_substrcmp(*av, "move") == 0) {
1632                 ac--; av++;
1633                 if (ac && _substrcmp(*av, "rule") == 0) {
1634                         cmd = 2;
1635                         ac--; av++;
1636                 } else
1637                         cmd = 3;
1638                 if (ac != 3 || _substrcmp(av[1], "to") != 0)
1639                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1640                 rulenum = atoi(av[0]);
1641                 new_set = atoi(av[2]);
1642                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1643                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1644                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1645                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1646                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1647                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1648                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1649         } else if (_substrcmp(*av, "disable") == 0 ||
1650                    _substrcmp(*av, "enable") == 0 ) {
1651                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1652
1653                 ac--; av++;
1654                 masks[0] = masks[1] = 0;
1655
1656                 while (ac) {
1657                         if (isdigit(**av)) {
1658                                 i = atoi(*av);
1659                                 if (i < 0 || i > RESVD_SET)
1660                                         errx(EX_DATAERR,
1661                                             "invalid set number %d\n", i);
1662                                 masks[which] |= (1<<i);
1663                         } else if (_substrcmp(*av, "disable") == 0)
1664                                 which = 0;
1665                         else if (_substrcmp(*av, "enable") == 0)
1666                                 which = 1;
1667                         else
1668                                 errx(EX_DATAERR,
1669                                         "invalid set command %s\n", *av);
1670                         av++; ac--;
1671                 }
1672                 if ( (masks[0] & masks[1]) != 0 )
1673                         errx(EX_DATAERR,
1674                             "cannot enable and disable the same set\n");
1675
1676                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1677                 if (i)
1678                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1679         } else
1680                 errx(EX_USAGE, "invalid set command %s\n", *av);
1681 }
1682
1683 void
1684 ipfw_sysctl_handler(int ac, char *av[], int which)
1685 {
1686         ac--;
1687         av++;
1688
1689         if (ac == 0) {
1690                 warnx("missing keyword to enable/disable\n");
1691         } else if (_substrcmp(*av, "firewall") == 0) {
1692                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1693                     &which, sizeof(which));
1694         } else if (_substrcmp(*av, "one_pass") == 0) {
1695                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1696                     &which, sizeof(which));
1697         } else if (_substrcmp(*av, "debug") == 0) {
1698                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1699                     &which, sizeof(which));
1700         } else if (_substrcmp(*av, "verbose") == 0) {
1701                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1702                     &which, sizeof(which));
1703         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1704                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1705                     &which, sizeof(which));
1706         } else if (_substrcmp(*av, "altq") == 0) {
1707                 altq_set_enabled(which);
1708         } else {
1709                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1710         }
1711 }
1712
1713 void
1714 ipfw_list(int ac, char *av[], int show_counters)
1715 {
1716         struct ip_fw *r;
1717         ipfw_dyn_rule *dynrules, *d;
1718
1719 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1720         char *lim;
1721         void *data = NULL;
1722         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1723         int exitval = EX_OK;
1724         int lac;
1725         char **lav;
1726         u_long rnum, last;
1727         char *endptr;
1728         int seen = 0;
1729         uint8_t set;
1730
1731         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1732         int nalloc = 1024;      /* start somewhere... */
1733
1734         last = 0;
1735
1736         if (co.test_only) {
1737                 fprintf(stderr, "Testing only, list disabled\n");
1738                 return;
1739         }
1740
1741         ac--;
1742         av++;
1743
1744         /* get rules or pipes from kernel, resizing array as necessary */
1745         nbytes = nalloc;
1746
1747         while (nbytes >= nalloc) {
1748                 nalloc = nalloc * 2 + 200;
1749                 nbytes = nalloc;
1750                 data = safe_realloc(data, nbytes);
1751                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1752                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1753                                 co.do_pipe ? "DUMMYNET" : "FW");
1754         }
1755
1756         if (co.do_pipe) {
1757                 ipfw_list_pipes(data, nbytes, ac, av);
1758                 goto done;
1759         }
1760
1761         /*
1762          * Count static rules. They have variable size so we
1763          * need to scan the list to count them.
1764          */
1765         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1766                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1767                     ++nstat, r = NEXT(r) )
1768                 ; /* nothing */
1769
1770         /*
1771          * Count dynamic rules. This is easier as they have
1772          * fixed size.
1773          */
1774         r = NEXT(r);
1775         dynrules = (ipfw_dyn_rule *)r ;
1776         n = (char *)r - (char *)data;
1777         ndyn = (nbytes - n) / sizeof *dynrules;
1778
1779         /* if showing stats, figure out column widths ahead of time */
1780         bcwidth = pcwidth = 0;
1781         if (show_counters) {
1782                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1783                         /* skip rules from another set */
1784                         if (co.use_set && r->set != co.use_set - 1)
1785                                 continue;
1786
1787                         /* packet counter */
1788                         width = snprintf(NULL, 0, "%llu",
1789                             align_uint64(&r->pcnt));
1790                         if (width > pcwidth)
1791                                 pcwidth = width;
1792
1793                         /* byte counter */
1794                         width = snprintf(NULL, 0, "%llu",
1795                             align_uint64(&r->bcnt));
1796                         if (width > bcwidth)
1797                                 bcwidth = width;
1798                 }
1799         }
1800         if (co.do_dynamic && ndyn) {
1801                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1802                         if (co.use_set) {
1803                                 /* skip rules from another set */
1804                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1805                                       &set, sizeof(uint8_t));
1806                                 if (set != co.use_set - 1)
1807                                         continue;
1808                         }
1809                         width = snprintf(NULL, 0, "%llu",
1810                             align_uint64(&d->pcnt));
1811                         if (width > pcwidth)
1812                                 pcwidth = width;
1813
1814                         width = snprintf(NULL, 0, "%llu",
1815                             align_uint64(&d->bcnt));
1816                         if (width > bcwidth)
1817                                 bcwidth = width;
1818                 }
1819         }
1820         /* if no rule numbers were specified, list all rules */
1821         if (ac == 0) {
1822                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1823                         if (co.use_set && r->set != co.use_set - 1)
1824                                 continue;
1825                         show_ipfw(r, pcwidth, bcwidth);
1826                 }
1827
1828                 if (co.do_dynamic && ndyn) {
1829                         printf("## Dynamic rules (%d):\n", ndyn);
1830                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1831                                 if (co.use_set) {
1832                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1833                                               &set, sizeof(uint8_t));
1834                                         if (set != co.use_set - 1)
1835                                                 continue;
1836                                 }
1837                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1838                 }
1839                 }
1840                 goto done;
1841         }
1842
1843         /* display specific rules requested on command line */
1844
1845         for (lac = ac, lav = av; lac != 0; lac--) {
1846                 /* convert command line rule # */
1847                 last = rnum = strtoul(*lav++, &endptr, 10);
1848                 if (*endptr == '-')
1849                         last = strtoul(endptr+1, &endptr, 10);
1850                 if (*endptr) {
1851                         exitval = EX_USAGE;
1852                         warnx("invalid rule number: %s", *(lav - 1));
1853                         continue;
1854                 }
1855                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1856                         if (r->rulenum > last)
1857                                 break;
1858                         if (co.use_set && r->set != co.use_set - 1)
1859                                 continue;
1860                         if (r->rulenum >= rnum && r->rulenum <= last) {
1861                                 show_ipfw(r, pcwidth, bcwidth);
1862                                 seen = 1;
1863                         }
1864                 }
1865                 if (!seen) {
1866                         /* give precedence to other error(s) */
1867                         if (exitval == EX_OK)
1868                                 exitval = EX_UNAVAILABLE;
1869                         warnx("rule %lu does not exist", rnum);
1870                 }
1871         }
1872
1873         if (co.do_dynamic && ndyn) {
1874                 printf("## Dynamic rules:\n");
1875                 for (lac = ac, lav = av; lac != 0; lac--) {
1876                         last = rnum = strtoul(*lav++, &endptr, 10);
1877                         if (*endptr == '-')
1878                                 last = strtoul(endptr+1, &endptr, 10);
1879                         if (*endptr)
1880                                 /* already warned */
1881                                 continue;
1882                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1883                                 uint16_t rulenum;
1884
1885                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1886                                 if (rulenum > rnum)
1887                                         break;
1888                                 if (co.use_set) {
1889                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1890                                               &set, sizeof(uint8_t));
1891                                         if (set != co.use_set - 1)
1892                                                 continue;
1893                                 }
1894                                 if (r->rulenum >= rnum && r->rulenum <= last)
1895                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1896                         }
1897                 }
1898         }
1899
1900         ac = 0;
1901
1902 done:
1903         free(data);
1904
1905         if (exitval != EX_OK)
1906                 exit(exitval);
1907 #undef NEXT
1908 }
1909
1910 static int
1911 lookup_host (char *host, struct in_addr *ipaddr)
1912 {
1913         struct hostent *he;
1914
1915         if (!inet_aton(host, ipaddr)) {
1916                 if ((he = gethostbyname(host)) == NULL)
1917                         return(-1);
1918                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1919         }
1920         return(0);
1921 }
1922
1923 /*
1924  * fills the addr and mask fields in the instruction as appropriate from av.
1925  * Update length as appropriate.
1926  * The following formats are allowed:
1927  *      me      returns O_IP_*_ME
1928  *      1.2.3.4         single IP address
1929  *      1.2.3.4:5.6.7.8 address:mask
1930  *      1.2.3.4/24      address/mask
1931  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1932  * We can have multiple comma-separated address/mask entries.
1933  */
1934 static void
1935 fill_ip(ipfw_insn_ip *cmd, char *av)
1936 {
1937         int len = 0;
1938         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
1939
1940         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1941
1942         if (_substrcmp(av, "any") == 0)
1943                 return;
1944
1945         if (_substrcmp(av, "me") == 0) {
1946                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1947                 return;
1948         }
1949
1950         if (strncmp(av, "table(", 6) == 0) {
1951                 char *p = strchr(av + 6, ',');
1952
1953                 if (p)
1954                         *p++ = '\0';
1955                 cmd->o.opcode = O_IP_DST_LOOKUP;
1956                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
1957                 if (p) {
1958                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1959                         d[0] = strtoul(p, NULL, 0);
1960                 } else
1961                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1962                 return;
1963         }
1964
1965     while (av) {
1966         /*
1967          * After the address we can have '/' or ':' indicating a mask,
1968          * ',' indicating another address follows, '{' indicating a
1969          * set of addresses of unspecified size.
1970          */
1971         char *t = NULL, *p = strpbrk(av, "/:,{");
1972         int masklen;
1973         char md, nd = '\0';
1974
1975         if (p) {
1976                 md = *p;
1977                 *p++ = '\0';
1978                 if ((t = strpbrk(p, ",{")) != NULL) {
1979                         nd = *t;
1980                         *t = '\0';
1981                 }
1982         } else
1983                 md = '\0';
1984
1985         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
1986                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1987         switch (md) {
1988         case ':':
1989                 if (!inet_aton(p, (struct in_addr *)&d[1]))
1990                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1991                 break;
1992         case '/':
1993                 masklen = atoi(p);
1994                 if (masklen == 0)
1995                         d[1] = htonl(0);        /* mask */
1996                 else if (masklen > 32)
1997                         errx(EX_DATAERR, "bad width ``%s''", p);
1998                 else
1999                         d[1] = htonl(~0 << (32 - masklen));
2000                 break;
2001         case '{':       /* no mask, assume /24 and put back the '{' */
2002                 d[1] = htonl(~0 << (32 - 24));
2003                 *(--p) = md;
2004                 break;
2005
2006         case ',':       /* single address plus continuation */
2007                 *(--p) = md;
2008                 /* FALLTHROUGH */
2009         case 0:         /* initialization value */
2010         default:
2011                 d[1] = htonl(~0);       /* force /32 */
2012                 break;
2013         }
2014         d[0] &= d[1];           /* mask base address with mask */
2015         if (t)
2016                 *t = nd;
2017         /* find next separator */
2018         if (p)
2019                 p = strpbrk(p, ",{");
2020         if (p && *p == '{') {
2021                 /*
2022                  * We have a set of addresses. They are stored as follows:
2023                  *   arg1       is the set size (powers of 2, 2..256)
2024                  *   addr       is the base address IN HOST FORMAT
2025                  *   mask..     is an array of arg1 bits (rounded up to
2026                  *              the next multiple of 32) with bits set
2027                  *              for each host in the map.
2028                  */
2029                 uint32_t *map = (uint32_t *)&cmd->mask;
2030                 int low, high;
2031                 int i = contigmask((uint8_t *)&(d[1]), 32);
2032
2033                 if (len > 0)
2034                         errx(EX_DATAERR, "address set cannot be in a list");
2035                 if (i < 24 || i > 31)
2036                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2037                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2038                 d[0] = ntohl(d[0]);             /* base addr in host format */
2039                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2040                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2041                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2042                         map[i] = 0;     /* clear map */
2043
2044                 av = p + 1;
2045                 low = d[0] & 0xff;
2046                 high = low + cmd->o.arg1 - 1;
2047                 /*
2048                  * Here, i stores the previous value when we specify a range
2049                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2050                  * have no previous value.
2051                  */
2052                 i = -1; /* previous value in a range */
2053                 while (isdigit(*av)) {
2054                         char *s;
2055                         int a = strtol(av, &s, 0);
2056
2057                         if (s == av) { /* no parameter */
2058                             if (*av != '}')
2059                                 errx(EX_DATAERR, "set not closed\n");
2060                             if (i != -1)
2061                                 errx(EX_DATAERR, "incomplete range %d-", i);
2062                             break;
2063                         }
2064                         if (a < low || a > high)
2065                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2066                                 a, low, high);
2067                         a -= low;
2068                         if (i == -1)    /* no previous in range */
2069                             i = a;
2070                         else {          /* check that range is valid */
2071                             if (i > a)
2072                                 errx(EX_DATAERR, "invalid range %d-%d",
2073                                         i+low, a+low);
2074                             if (*s == '-')
2075                                 errx(EX_DATAERR, "double '-' in range");
2076                         }
2077                         for (; i <= a; i++)
2078                             map[i/32] |= 1<<(i & 31);
2079                         i = -1;
2080                         if (*s == '-')
2081                             i = a;
2082                         else if (*s == '}')
2083                             break;
2084                         av = s+1;
2085                 }
2086                 return;
2087         }
2088         av = p;
2089         if (av)                 /* then *av must be a ',' */
2090                 av++;
2091
2092         /* Check this entry */
2093         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2094                 /*
2095                  * 'any' turns the entire list into a NOP.
2096                  * 'not any' never matches, so it is removed from the
2097                  * list unless it is the only item, in which case we
2098                  * report an error.
2099                  */
2100                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2101                         if (av == NULL && len == 0) /* only this entry */
2102                                 errx(EX_DATAERR, "not any never matches");
2103                 }
2104                 /* else do nothing and skip this entry */
2105                 return;
2106         }
2107         /* A single IP can be stored in an optimized format */
2108         if (d[1] == ~0 && av == NULL && len == 0) {
2109                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2110                 return;
2111         }
2112         len += 2;       /* two words... */
2113         d += 2;
2114     } /* end while */
2115     if (len + 1 > F_LEN_MASK)
2116         errx(EX_DATAERR, "address list too long");
2117     cmd->o.len |= len+1;
2118 }
2119
2120
2121 /* n2mask sets n bits of the mask */
2122 void
2123 n2mask(struct in6_addr *mask, int n)
2124 {
2125         static int      minimask[9] =
2126             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2127         u_char          *p;
2128
2129         memset(mask, 0, sizeof(struct in6_addr));
2130         p = (u_char *) mask;
2131         for (; n > 0; p++, n -= 8) {
2132                 if (n >= 8)
2133                         *p = 0xff;
2134                 else
2135                         *p = minimask[n];
2136         }
2137         return;
2138 }
2139
2140
2141 /*
2142  * helper function to process a set of flags and set bits in the
2143  * appropriate masks.
2144  */
2145 static void
2146 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2147         struct _s_x *flags, char *p)
2148 {
2149         uint8_t set=0, clear=0;
2150
2151         while (p && *p) {
2152                 char *q;        /* points to the separator */
2153                 int val;
2154                 uint8_t *which; /* mask we are working on */
2155
2156                 if (*p == '!') {
2157                         p++;
2158                         which = &clear;
2159                 } else
2160                         which = &set;
2161                 q = strchr(p, ',');
2162                 if (q)
2163                         *q++ = '\0';
2164                 val = match_token(flags, p);
2165                 if (val <= 0)
2166                         errx(EX_DATAERR, "invalid flag %s", p);
2167                 *which |= (uint8_t)val;
2168                 p = q;
2169         }
2170         cmd->opcode = opcode;
2171         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2172         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2173 }
2174
2175
2176 void
2177 ipfw_delete(int ac, char *av[])
2178 {
2179         uint32_t rulenum;
2180         int i;
2181         int exitval = EX_OK;
2182         int do_set = 0;
2183
2184
2185         av++; ac--;
2186         NEED1("missing rule specification");
2187         if (ac > 0 && _substrcmp(*av, "set") == 0) {
2188                 /* Do not allow using the following syntax:
2189                  *      ipfw set N delete set M
2190                  */
2191                 if (co.use_set)
2192                         errx(EX_DATAERR, "invalid syntax");
2193                 do_set = 1;     /* delete set */
2194                 ac--; av++;
2195         }
2196
2197         /* Rule number */
2198         while (ac && isdigit(**av)) {
2199                 i = atoi(*av); av++; ac--;
2200                 if (co.do_nat) {
2201                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2202                         if (exitval) {
2203                                 exitval = EX_UNAVAILABLE;
2204                                 warn("rule %u not available", i);
2205                         }
2206                 } else if (co.do_pipe) {
2207                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2208                 } else {
2209                         if (co.use_set)
2210                                 rulenum = (i & 0xffff) | (5 << 24) |
2211                                     ((co.use_set - 1) << 16);
2212                         else
2213                         rulenum =  (i & 0xffff) | (do_set << 24);
2214                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2215                         if (i) {
2216                                 exitval = EX_UNAVAILABLE;
2217                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2218                                     rulenum);
2219                         }
2220                 }
2221         }
2222         if (exitval != EX_OK)
2223                 exit(exitval);
2224 }
2225
2226
2227 /*
2228  * fill the interface structure. We do not check the name as we can
2229  * create interfaces dynamically, so checking them at insert time
2230  * makes relatively little sense.
2231  * Interface names containing '*', '?', or '[' are assumed to be shell
2232  * patterns which match interfaces.
2233  */
2234 static void
2235 fill_iface(ipfw_insn_if *cmd, char *arg)
2236 {
2237         cmd->name[0] = '\0';
2238         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2239
2240         /* Parse the interface or address */
2241         if (strcmp(arg, "any") == 0)
2242                 cmd->o.len = 0;         /* effectively ignore this command */
2243         else if (!isdigit(*arg)) {
2244                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2245                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2246         } else if (!inet_aton(arg, &cmd->p.ip))
2247                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2248 }
2249
2250 static void
2251 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2252 {
2253         int i, l;
2254         char *ap, *ptr, *optr;
2255         struct ether_addr *mac;
2256         const char *macset = "0123456789abcdefABCDEF:";
2257
2258         if (strcmp(p, "any") == 0) {
2259                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2260                         addr[i] = mask[i] = 0;
2261                 return;
2262         }
2263
2264         optr = ptr = strdup(p);
2265         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2266                 l = strlen(ap);
2267                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2268                         errx(EX_DATAERR, "Incorrect MAC address");
2269                 bcopy(mac, addr, ETHER_ADDR_LEN);
2270         } else
2271                 errx(EX_DATAERR, "Incorrect MAC address");
2272
2273         if (ptr != NULL) { /* we have mask? */
2274                 if (p[ptr - optr - 1] == '/') { /* mask len */
2275                         l = strtol(ptr, &ap, 10);
2276                         if (*ap != 0 || l > ETHER_ADDR_LEN * 8 || l < 0)
2277                                 errx(EX_DATAERR, "Incorrect mask length");
2278                         for (i = 0; l > 0 && i < ETHER_ADDR_LEN; l -= 8, i++)
2279                                 mask[i] = (l >= 8) ? 0xff: (~0) << (8 - l);
2280                 } else { /* mask */
2281                         l = strlen(ptr);
2282                         if (strspn(ptr, macset) != l ||
2283                             (mac = ether_aton(ptr)) == NULL)
2284                                 errx(EX_DATAERR, "Incorrect mask");
2285                         bcopy(mac, mask, ETHER_ADDR_LEN);
2286                 }
2287         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2288                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2289                         mask[i] = 0xff;
2290         }
2291         for (i = 0; i < ETHER_ADDR_LEN; i++)
2292                 addr[i] &= mask[i];
2293
2294         free(optr);
2295 }
2296
2297 /*
2298  * helper function, updates the pointer to cmd with the length
2299  * of the current command, and also cleans up the first word of
2300  * the new command in case it has been clobbered before.
2301  */
2302 static ipfw_insn *
2303 next_cmd(ipfw_insn *cmd)
2304 {
2305         cmd += F_LEN(cmd);
2306         bzero(cmd, sizeof(*cmd));
2307         return cmd;
2308 }
2309
2310 /*
2311  * Takes arguments and copies them into a comment
2312  */
2313 static void
2314 fill_comment(ipfw_insn *cmd, int ac, char **av)
2315 {
2316         int i, l;
2317         char *p = (char *)(cmd + 1);
2318
2319         cmd->opcode = O_NOP;
2320         cmd->len =  (cmd->len & (F_NOT | F_OR));
2321
2322         /* Compute length of comment string. */
2323         for (i = 0, l = 0; i < ac; i++)
2324                 l += strlen(av[i]) + 1;
2325         if (l == 0)
2326                 return;
2327         if (l > 84)
2328                 errx(EX_DATAERR,
2329                     "comment too long (max 80 chars)");
2330         l = 1 + (l+3)/4;
2331         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2332         for (i = 0; i < ac; i++) {
2333                 strcpy(p, av[i]);
2334                 p += strlen(av[i]);
2335                 *p++ = ' ';
2336         }
2337         *(--p) = '\0';
2338 }
2339
2340 /*
2341  * A function to fill simple commands of size 1.
2342  * Existing flags are preserved.
2343  */
2344 static void
2345 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2346 {
2347         cmd->opcode = opcode;
2348         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2349         cmd->arg1 = arg;
2350 }
2351
2352 /*
2353  * Fetch and add the MAC address and type, with masks. This generates one or
2354  * two microinstructions, and returns the pointer to the last one.
2355  */
2356 static ipfw_insn *
2357 add_mac(ipfw_insn *cmd, int ac, char *av[])
2358 {
2359         ipfw_insn_mac *mac;
2360
2361         if (ac < 2)
2362                 errx(EX_DATAERR, "MAC dst src");
2363
2364         cmd->opcode = O_MACADDR2;
2365         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2366
2367         mac = (ipfw_insn_mac *)cmd;
2368         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2369         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2370             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2371         return cmd;
2372 }
2373
2374 static ipfw_insn *
2375 add_mactype(ipfw_insn *cmd, int ac, char *av)
2376 {
2377         if (ac < 1)
2378                 errx(EX_DATAERR, "missing MAC type");
2379         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2380                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2381                 cmd->opcode = O_MAC_TYPE;
2382                 return cmd;
2383         } else
2384                 return NULL;
2385 }
2386
2387 static ipfw_insn *
2388 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2389 {
2390         struct protoent *pe;
2391         char *ep;
2392         int proto;
2393
2394         proto = strtol(av, &ep, 10);
2395         if (*ep != '\0' || proto <= 0) {
2396                 if ((pe = getprotobyname(av)) == NULL)
2397                         return NULL;
2398                 proto = pe->p_proto;
2399         }
2400
2401         fill_cmd(cmd, O_PROTO, 0, proto);
2402         *protop = proto;
2403         return cmd;
2404 }
2405
2406 static ipfw_insn *
2407 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2408 {
2409         u_char proto = IPPROTO_IP;
2410
2411         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2412                 ; /* do not set O_IP4 nor O_IP6 */
2413         else if (strcmp(av, "ip4") == 0)
2414                 /* explicit "just IPv4" rule */
2415                 fill_cmd(cmd, O_IP4, 0, 0);
2416         else if (strcmp(av, "ip6") == 0) {
2417                 /* explicit "just IPv6" rule */
2418                 proto = IPPROTO_IPV6;
2419                 fill_cmd(cmd, O_IP6, 0, 0);
2420         } else
2421                 return add_proto0(cmd, av, protop);
2422
2423         *protop = proto;
2424         return cmd;
2425 }
2426
2427 static ipfw_insn *
2428 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2429 {
2430         u_char proto = IPPROTO_IP;
2431
2432         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2433                 ; /* do not set O_IP4 nor O_IP6 */
2434         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2435                 /* explicit "just IPv4" rule */
2436                 fill_cmd(cmd, O_IP4, 0, 0);
2437         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2438                 /* explicit "just IPv6" rule */
2439                 proto = IPPROTO_IPV6;
2440                 fill_cmd(cmd, O_IP6, 0, 0);
2441         } else
2442                 return add_proto0(cmd, av, protop);
2443
2444         *protop = proto;
2445         return cmd;
2446 }
2447
2448 static ipfw_insn *
2449 add_srcip(ipfw_insn *cmd, char *av)
2450 {
2451         fill_ip((ipfw_insn_ip *)cmd, av);
2452         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2453                 cmd->opcode = O_IP_SRC_SET;
2454         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2455                 cmd->opcode = O_IP_SRC_LOOKUP;
2456         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2457                 cmd->opcode = O_IP_SRC_ME;
2458         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2459                 cmd->opcode = O_IP_SRC;
2460         else                                                    /* addr/mask */
2461                 cmd->opcode = O_IP_SRC_MASK;
2462         return cmd;
2463 }
2464
2465 static ipfw_insn *
2466 add_dstip(ipfw_insn *cmd, char *av)
2467 {
2468         fill_ip((ipfw_insn_ip *)cmd, av);
2469         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2470                 ;
2471         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2472                 ;
2473         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2474                 cmd->opcode = O_IP_DST_ME;
2475         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2476                 cmd->opcode = O_IP_DST;
2477         else                                                    /* addr/mask */
2478                 cmd->opcode = O_IP_DST_MASK;
2479         return cmd;
2480 }
2481
2482 static ipfw_insn *
2483 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2484 {
2485         if (_substrcmp(av, "any") == 0) {
2486                 return NULL;
2487         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2488                 /* XXX todo: check that we have a protocol with ports */
2489                 cmd->opcode = opcode;
2490                 return cmd;
2491         }
2492         return NULL;
2493 }
2494
2495 static ipfw_insn *
2496 add_src(ipfw_insn *cmd, char *av, u_char proto)
2497 {
2498         struct in6_addr a;
2499         char *host, *ch;
2500         ipfw_insn *ret = NULL;
2501
2502         if ((host = strdup(av)) == NULL)
2503                 return NULL;
2504         if ((ch = strrchr(host, '/')) != NULL)
2505                 *ch = '\0';
2506
2507         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2508             inet_pton(AF_INET6, host, &a))
2509                 ret = add_srcip6(cmd, av);
2510         /* XXX: should check for IPv4, not !IPv6 */
2511         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2512             !inet_pton(AF_INET6, host, &a)))
2513                 ret = add_srcip(cmd, av);
2514         if (ret == NULL && strcmp(av, "any") != 0)
2515                 ret = cmd;
2516
2517         free(host);
2518         return ret;
2519 }
2520
2521 static ipfw_insn *
2522 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2523 {
2524         struct in6_addr a;
2525         char *host, *ch;
2526         ipfw_insn *ret = NULL;
2527
2528         if ((host = strdup(av)) == NULL)
2529                 return NULL;
2530         if ((ch = strrchr(host, '/')) != NULL)
2531                 *ch = '\0';
2532
2533         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2534             inet_pton(AF_INET6, host, &a))
2535                 ret = add_dstip6(cmd, av);
2536         /* XXX: should check for IPv4, not !IPv6 */
2537         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2538             !inet_pton(AF_INET6, host, &a)))
2539                 ret = add_dstip(cmd, av);
2540         if (ret == NULL && strcmp(av, "any") != 0)
2541                 ret = cmd;
2542
2543         free(host);
2544         return ret;
2545 }
2546
2547 /*
2548  * Parse arguments and assemble the microinstructions which make up a rule.
2549  * Rules are added into the 'rulebuf' and then copied in the correct order
2550  * into the actual rule.
2551  *
2552  * The syntax for a rule starts with the action, followed by
2553  * optional action parameters, and the various match patterns.
2554  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2555  * (generated if the rule includes a keep-state option), then the
2556  * various match patterns, log/altq actions, and the actual action.
2557  *
2558  */
2559 void
2560 ipfw_add(int ac, char *av[])
2561 {
2562         /*
2563          * rules are added into the 'rulebuf' and then copied in
2564          * the correct order into the actual rule.
2565          * Some things that need to go out of order (prob, action etc.)
2566          * go into actbuf[].
2567          */
2568         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2569
2570         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2571         ipfw_insn *first_cmd;   /* first match pattern */
2572
2573         struct ip_fw *rule;
2574
2575         /*
2576          * various flags used to record that we entered some fields.
2577          */
2578         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2579         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2580         size_t len;
2581
2582         int i;
2583
2584         int open_par = 0;       /* open parenthesis ( */
2585
2586         /* proto is here because it is used to fetch ports */
2587         u_char proto = IPPROTO_IP;      /* default protocol */
2588
2589         double match_prob = 1; /* match probability, default is always match */
2590
2591         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2592         bzero(cmdbuf, sizeof(cmdbuf));
2593         bzero(rulebuf, sizeof(rulebuf));
2594
2595         rule = (struct ip_fw *)rulebuf;
2596         cmd = (ipfw_insn *)cmdbuf;
2597         action = (ipfw_insn *)actbuf;
2598
2599         av++; ac--;
2600
2601         /* [rule N]     -- Rule number optional */
2602         if (ac && isdigit(**av)) {
2603                 rule->rulenum = atoi(*av);
2604                 av++;
2605                 ac--;
2606         }
2607
2608         /* [set N]      -- set number (0..RESVD_SET), optional */
2609         if (ac > 1 && _substrcmp(*av, "set") == 0) {
2610                 int set = strtoul(av[1], NULL, 10);
2611                 if (set < 0 || set > RESVD_SET)
2612                         errx(EX_DATAERR, "illegal set %s", av[1]);
2613                 rule->set = set;
2614                 av += 2; ac -= 2;
2615         }
2616
2617         /* [prob D]     -- match probability, optional */
2618         if (ac > 1 && _substrcmp(*av, "prob") == 0) {
2619                 match_prob = strtod(av[1], NULL);
2620
2621                 if (match_prob <= 0 || match_prob > 1)
2622                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2623                 av += 2; ac -= 2;
2624         }
2625
2626         /* action       -- mandatory */
2627         NEED1("missing action");
2628         i = match_token(rule_actions, *av);
2629         ac--; av++;
2630         action->len = 1;        /* default */
2631         switch(i) {
2632         case TOK_CHECKSTATE:
2633                 have_state = action;
2634                 action->opcode = O_CHECK_STATE;
2635                 break;
2636
2637         case TOK_ACCEPT:
2638                 action->opcode = O_ACCEPT;
2639                 break;
2640
2641         case TOK_DENY:
2642                 action->opcode = O_DENY;
2643                 action->arg1 = 0;
2644                 break;
2645
2646         case TOK_REJECT:
2647                 action->opcode = O_REJECT;
2648                 action->arg1 = ICMP_UNREACH_HOST;
2649                 break;
2650
2651         case TOK_RESET:
2652                 action->opcode = O_REJECT;
2653                 action->arg1 = ICMP_REJECT_RST;
2654                 break;
2655
2656         case TOK_RESET6:
2657                 action->opcode = O_UNREACH6;
2658                 action->arg1 = ICMP6_UNREACH_RST;
2659                 break;
2660
2661         case TOK_UNREACH:
2662                 action->opcode = O_REJECT;
2663                 NEED1("missing reject code");
2664                 fill_reject_code(&action->arg1, *av);
2665                 ac--; av++;
2666                 break;
2667
2668         case TOK_UNREACH6:
2669                 action->opcode = O_UNREACH6;
2670                 NEED1("missing unreach code");
2671                 fill_unreach6_code(&action->arg1, *av);
2672                 ac--; av++;
2673                 break;
2674
2675         case TOK_COUNT:
2676                 action->opcode = O_COUNT;
2677                 break;
2678
2679         case TOK_NAT:
2680                 action->opcode = O_NAT;
2681                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2682                 goto chkarg;
2683
2684         case TOK_QUEUE:
2685                 action->opcode = O_QUEUE;
2686                 goto chkarg;
2687         case TOK_PIPE:
2688                 action->opcode = O_PIPE;
2689                 goto chkarg;
2690         case TOK_SKIPTO:
2691                 action->opcode = O_SKIPTO;
2692                 goto chkarg;
2693         case TOK_NETGRAPH:
2694                 action->opcode = O_NETGRAPH;
2695                 goto chkarg;
2696         case TOK_NGTEE:
2697                 action->opcode = O_NGTEE;
2698                 goto chkarg;
2699         case TOK_DIVERT:
2700                 action->opcode = O_DIVERT;
2701                 goto chkarg;
2702         case TOK_TEE:
2703                 action->opcode = O_TEE;
2704 chkarg:
2705                 if (!ac)
2706                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2707                 if (isdigit(**av)) {
2708                         action->arg1 = strtoul(*av, NULL, 10);
2709                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2710                                 errx(EX_DATAERR, "illegal argument for %s",
2711                                     *(av - 1));
2712                 } else if (_substrcmp(*av, "tablearg") == 0) {
2713                         action->arg1 = IP_FW_TABLEARG;
2714                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2715                         struct servent *s;
2716                         setservent(1);
2717                         s = getservbyname(av[0], "divert");
2718                         if (s != NULL)
2719                                 action->arg1 = ntohs(s->s_port);
2720                         else
2721                                 errx(EX_DATAERR, "illegal divert/tee port");
2722                 } else
2723                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2724                 ac--; av++;
2725                 break;
2726
2727         case TOK_FORWARD: {
2728                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2729                 char *s, *end;
2730
2731                 NEED1("missing forward address[:port]");
2732
2733                 action->opcode = O_FORWARD_IP;
2734                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2735
2736                 /*
2737                  * In the kernel we assume AF_INET and use only
2738                  * sin_port and sin_addr.
2739                  */
2740                 p->sa.sin_family = AF_INET;
2741                 p->sa.sin_port = 0;
2742                 /*
2743                  * locate the address-port separator (':' or ',')
2744                  */
2745                 s = strchr(*av, ':');
2746                 if (s == NULL)
2747                         s = strchr(*av, ',');
2748                 if (s != NULL) {
2749                         *(s++) = '\0';
2750                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2751                         if (s == end)
2752                                 errx(EX_DATAERR,
2753                                     "illegal forwarding port ``%s''", s);
2754                         p->sa.sin_port = (u_short)i;
2755                 }
2756                 if (_substrcmp(*av, "tablearg") == 0)
2757                         p->sa.sin_addr.s_addr = INADDR_ANY;
2758                 else
2759                         lookup_host(*av, &(p->sa.sin_addr));
2760                 ac--; av++;
2761                 break;
2762             }
2763         case TOK_COMMENT:
2764                 /* pretend it is a 'count' rule followed by the comment */
2765                 action->opcode = O_COUNT;
2766                 ac++; av--;     /* go back... */
2767                 break;
2768
2769         case TOK_SETFIB:
2770             {
2771                 int numfibs;
2772                 size_t intsize = sizeof(int);
2773
2774                 action->opcode = O_SETFIB;
2775                 NEED1("missing fib number");
2776                 action->arg1 = strtoul(*av, NULL, 10);
2777                 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
2778                         errx(EX_DATAERR, "fibs not suported.\n");
2779                 if (action->arg1 >= numfibs)  /* Temporary */
2780                         errx(EX_DATAERR, "fib too large.\n");
2781                 ac--; av++;
2782                 break;
2783             }
2784
2785         default:
2786                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2787         }
2788         action = next_cmd(action);
2789
2790         /*
2791          * [altq queuename] -- altq tag, optional
2792          * [log [logamount N]]  -- log, optional
2793          *
2794          * If they exist, it go first in the cmdbuf, but then it is
2795          * skipped in the copy section to the end of the buffer.
2796          */
2797         while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) {
2798                 ac--; av++;
2799                 switch (i) {
2800                 case TOK_LOG:
2801                     {
2802                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2803                         int l;
2804
2805                         if (have_log)
2806                                 errx(EX_DATAERR,
2807                                     "log cannot be specified more than once");
2808                         have_log = (ipfw_insn *)c;
2809                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2810                         cmd->opcode = O_LOG;
2811                         if (ac && _substrcmp(*av, "logamount") == 0) {
2812                                 ac--; av++;
2813                                 NEED1("logamount requires argument");
2814                                 l = atoi(*av);
2815                                 if (l < 0)
2816                                         errx(EX_DATAERR,
2817                                             "logamount must be positive");
2818                                 c->max_log = l;
2819                                 ac--; av++;
2820                         } else {
2821                                 len = sizeof(c->max_log);
2822                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2823                                     &c->max_log, &len, NULL, 0) == -1)
2824                                         errx(1, "sysctlbyname(\"%s\")",
2825                                             "net.inet.ip.fw.verbose_limit");
2826                         }
2827                     }
2828                         break;
2829
2830                 case TOK_ALTQ:
2831                     {
2832                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2833
2834                         NEED1("missing altq queue name");
2835                         if (have_altq)
2836                                 errx(EX_DATAERR,
2837                                     "altq cannot be specified more than once");
2838                         have_altq = (ipfw_insn *)a;
2839                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2840                         cmd->opcode = O_ALTQ;
2841                         a->qid = altq_name_to_qid(*av);
2842                         ac--; av++;
2843                     }
2844                         break;
2845
2846                 case TOK_TAG:
2847                 case TOK_UNTAG: {
2848                         uint16_t tag;
2849
2850                         if (have_tag)
2851                                 errx(EX_USAGE, "tag and untag cannot be "
2852                                     "specified more than once");
2853                         GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, i,
2854                            rule_action_params);
2855                         have_tag = cmd;
2856                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2857                         ac--; av++;
2858                         break;
2859                 }
2860
2861                 default:
2862                         abort();
2863                 }
2864                 cmd = next_cmd(cmd);
2865         }
2866
2867         if (have_state) /* must be a check-state, we are done */
2868                 goto done;
2869
2870 #define OR_START(target)                                        \
2871         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2872                 if (open_par)                                   \
2873                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2874                 prev = NULL;                                    \
2875                 open_par = 1;                                   \
2876                 if ( (av[0])[1] == '\0') {                      \
2877                         ac--; av++;                             \
2878                 } else                                          \
2879                         (*av)++;                                \
2880         }                                                       \
2881         target:                                                 \
2882
2883
2884 #define CLOSE_PAR                                               \
2885         if (open_par) {                                         \
2886                 if (ac && (                                     \
2887                     strcmp(*av, ")") == 0 ||                    \
2888                     strcmp(*av, "}") == 0)) {                   \
2889                         prev = NULL;                            \
2890                         open_par = 0;                           \
2891                         ac--; av++;                             \
2892                 } else                                          \
2893                         errx(EX_USAGE, "missing \")\"\n");      \
2894         }
2895
2896 #define NOT_BLOCK                                               \
2897         if (ac && _substrcmp(*av, "not") == 0) {                \
2898                 if (cmd->len & F_NOT)                           \
2899                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2900                 cmd->len |= F_NOT;                              \
2901                 ac--; av++;                                     \
2902         }
2903
2904 #define OR_BLOCK(target)                                        \
2905         if (ac && _substrcmp(*av, "or") == 0) {         \
2906                 if (prev == NULL || open_par == 0)              \
2907                         errx(EX_DATAERR, "invalid OR block");   \
2908                 prev->len |= F_OR;                              \
2909                 ac--; av++;                                     \
2910                 goto target;                                    \
2911         }                                                       \
2912         CLOSE_PAR;
2913
2914         first_cmd = cmd;
2915
2916 #if 0
2917         /*
2918          * MAC addresses, optional.
2919          * If we have this, we skip the part "proto from src to dst"
2920          * and jump straight to the option parsing.
2921          */
2922         NOT_BLOCK;
2923         NEED1("missing protocol");
2924         if (_substrcmp(*av, "MAC") == 0 ||
2925             _substrcmp(*av, "mac") == 0) {
2926                 ac--; av++;     /* the "MAC" keyword */
2927                 add_mac(cmd, ac, av); /* exits in case of errors */
2928                 cmd = next_cmd(cmd);
2929                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2930                 NOT_BLOCK;
2931                 NEED1("missing mac type");
2932                 if (add_mactype(cmd, ac, av[0]))
2933                         cmd = next_cmd(cmd);
2934                 ac--; av++;     /* any or mac-type */
2935                 goto read_options;
2936         }
2937 #endif
2938
2939         /*
2940          * protocol, mandatory
2941          */
2942     OR_START(get_proto);
2943         NOT_BLOCK;
2944         NEED1("missing protocol");
2945         if (add_proto_compat(cmd, *av, &proto)) {
2946                 av++; ac--;
2947                 if (F_LEN(cmd) != 0) {
2948                         prev = cmd;
2949                         cmd = next_cmd(cmd);
2950                 }
2951         } else if (first_cmd != cmd) {
2952                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2953         } else
2954                 goto read_options;
2955     OR_BLOCK(get_proto);
2956
2957         /*
2958          * "from", mandatory
2959          */
2960         if (!ac || _substrcmp(*av, "from") != 0)
2961                 errx(EX_USAGE, "missing ``from''");
2962         ac--; av++;
2963
2964         /*
2965          * source IP, mandatory
2966          */
2967     OR_START(source_ip);
2968         NOT_BLOCK;      /* optional "not" */
2969         NEED1("missing source address");
2970         if (add_src(cmd, *av, proto)) {
2971                 ac--; av++;
2972                 if (F_LEN(cmd) != 0) {  /* ! any */
2973                         prev = cmd;
2974                         cmd = next_cmd(cmd);
2975                 }
2976         } else
2977                 errx(EX_USAGE, "bad source address %s", *av);
2978     OR_BLOCK(source_ip);
2979
2980         /*
2981          * source ports, optional
2982          */
2983         NOT_BLOCK;      /* optional "not" */
2984         if (ac) {
2985                 if (_substrcmp(*av, "any") == 0 ||
2986                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2987                         ac--; av++;
2988                         if (F_LEN(cmd) != 0)
2989                                 cmd = next_cmd(cmd);
2990                 }
2991         }
2992
2993         /*
2994          * "to", mandatory
2995          */
2996         if (!ac || _substrcmp(*av, "to") != 0)
2997                 errx(EX_USAGE, "missing ``to''");
2998         av++; ac--;
2999
3000         /*
3001          * destination, mandatory
3002          */
3003     OR_START(dest_ip);
3004         NOT_BLOCK;      /* optional "not" */
3005         NEED1("missing dst address");
3006         if (add_dst(cmd, *av, proto)) {
3007                 ac--; av++;
3008                 if (F_LEN(cmd) != 0) {  /* ! any */
3009                         prev = cmd;
3010                         cmd = next_cmd(cmd);
3011                 }
3012         } else
3013                 errx( EX_USAGE, "bad destination address %s", *av);
3014     OR_BLOCK(dest_ip);
3015
3016         /*
3017          * dest. ports, optional
3018          */
3019         NOT_BLOCK;      /* optional "not" */
3020         if (ac) {
3021                 if (_substrcmp(*av, "any") == 0 ||
3022                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3023                         ac--; av++;
3024                         if (F_LEN(cmd) != 0)
3025                                 cmd = next_cmd(cmd);
3026                 }
3027         }
3028
3029 read_options:
3030         if (ac && first_cmd == cmd) {
3031                 /*
3032                  * nothing specified so far, store in the rule to ease
3033                  * printout later.
3034                  */
3035                  rule->_pad = 1;
3036         }
3037         prev = NULL;
3038         while (ac) {
3039                 char *s;
3040                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3041
3042                 s = *av;
3043                 cmd32 = (ipfw_insn_u32 *)cmd;
3044
3045                 if (*s == '!') {        /* alternate syntax for NOT */
3046                         if (cmd->len & F_NOT)
3047                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3048                         cmd->len = F_NOT;
3049                         s++;
3050                 }
3051                 i = match_token(rule_options, s);
3052                 ac--; av++;
3053                 switch(i) {
3054                 case TOK_NOT:
3055                         if (cmd->len & F_NOT)
3056                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3057                         cmd->len = F_NOT;
3058                         break;
3059
3060                 case TOK_OR:
3061                         if (open_par == 0 || prev == NULL)
3062                                 errx(EX_USAGE, "invalid \"or\" block\n");
3063                         prev->len |= F_OR;
3064                         break;
3065
3066                 case TOK_STARTBRACE:
3067                         if (open_par)
3068                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3069                         open_par = 1;
3070                         break;
3071
3072                 case TOK_ENDBRACE:
3073                         if (!open_par)
3074                                 errx(EX_USAGE, "+missing \")\"\n");
3075                         open_par = 0;
3076                         prev = NULL;
3077                         break;
3078
3079                 case TOK_IN:
3080                         fill_cmd(cmd, O_IN, 0, 0);
3081                         break;
3082
3083                 case TOK_OUT:
3084                         cmd->len ^= F_NOT; /* toggle F_NOT */
3085                         fill_cmd(cmd, O_IN, 0, 0);
3086                         break;
3087
3088                 case TOK_DIVERTED:
3089                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3090                         break;
3091
3092                 case TOK_DIVERTEDLOOPBACK:
3093                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3094                         break;
3095
3096                 case TOK_DIVERTEDOUTPUT:
3097                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3098                         break;
3099
3100                 case TOK_FRAG:
3101                         fill_cmd(cmd, O_FRAG, 0, 0);
3102                         break;
3103
3104                 case TOK_LAYER2:
3105                         fill_cmd(cmd, O_LAYER2, 0, 0);
3106                         break;
3107
3108                 case TOK_XMIT:
3109                 case TOK_RECV:
3110                 case TOK_VIA:
3111                         NEED1("recv, xmit, via require interface name"
3112                                 " or address");
3113                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3114                         ac--; av++;
3115                         if (F_LEN(cmd) == 0)    /* not a valid address */
3116                                 break;
3117                         if (i == TOK_XMIT)
3118                                 cmd->opcode = O_XMIT;
3119                         else if (i == TOK_RECV)
3120                                 cmd->opcode = O_RECV;
3121                         else if (i == TOK_VIA)
3122                                 cmd->opcode = O_VIA;
3123                         break;
3124
3125                 case TOK_ICMPTYPES:
3126                         NEED1("icmptypes requires list of types");
3127                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3128                         av++; ac--;
3129                         break;
3130
3131                 case TOK_ICMP6TYPES:
3132                         NEED1("icmptypes requires list of types");
3133                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3134                         av++; ac--;
3135                         break;
3136
3137                 case TOK_IPTTL:
3138                         NEED1("ipttl requires TTL");
3139                         if (strpbrk(*av, "-,")) {
3140                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3141                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3142                         } else
3143                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3144                         ac--; av++;
3145                         break;
3146
3147                 case TOK_IPID:
3148                         NEED1("ipid requires id");
3149                         if (strpbrk(*av, "-,")) {
3150                             if (!add_ports(cmd, *av, 0, O_IPID))
3151                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3152                         } else
3153                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3154                         ac--; av++;
3155                         break;
3156
3157                 case TOK_IPLEN:
3158                         NEED1("iplen requires length");
3159                         if (strpbrk(*av, "-,")) {
3160                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3161                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3162                         } else
3163                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3164                         ac--; av++;
3165                         break;
3166
3167                 case TOK_IPVER:
3168                         NEED1("ipver requires version");
3169                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3170                         ac--; av++;
3171                         break;
3172
3173                 case TOK_IPPRECEDENCE:
3174                         NEED1("ipprecedence requires value");
3175                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3176                             (strtoul(*av, NULL, 0) & 7) << 5);
3177                         ac--; av++;
3178                         break;
3179
3180                 case TOK_IPOPTS:
3181                         NEED1("missing argument for ipoptions");
3182                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3183                         ac--; av++;
3184                         break;
3185
3186                 case TOK_IPTOS:
3187                         NEED1("missing argument for iptos");
3188                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3189                         ac--; av++;
3190                         break;
3191
3192                 case TOK_UID:
3193                         NEED1("uid requires argument");
3194                     {
3195                         char *end;
3196                         uid_t uid;
3197                         struct passwd *pwd;
3198
3199                         cmd->opcode = O_UID;
3200                         uid = strtoul(*av, &end, 0);
3201                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3202                         if (pwd == NULL)
3203                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3204                         cmd32->d[0] = pwd->pw_uid;
3205                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3206                         ac--; av++;
3207                     }
3208                         break;
3209
3210                 case TOK_GID:
3211                         NEED1("gid requires argument");
3212                     {
3213                         char *end;
3214                         gid_t gid;
3215                         struct group *grp;
3216
3217                         cmd->opcode = O_GID;
3218                         gid = strtoul(*av, &end, 0);
3219                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3220                         if (grp == NULL)
3221                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3222                         cmd32->d[0] = grp->gr_gid;
3223                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3224                         ac--; av++;
3225                     }
3226                         break;
3227
3228                 case TOK_JAIL:
3229                         NEED1("jail requires argument");
3230                     {
3231                         char *end;
3232                         int jid;
3233
3234                         cmd->opcode = O_JAIL;
3235                         jid = (int)strtol(*av, &end, 0);
3236                         if (jid < 0 || *end != '\0')
3237                                 errx(EX_DATAERR, "jail requires prison ID");
3238                         cmd32->d[0] = (uint32_t)jid;
3239                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3240                         ac--; av++;
3241                     }
3242                         break;
3243
3244                 case TOK_ESTAB:
3245                         fill_cmd(cmd, O_ESTAB, 0, 0);
3246                         break;
3247
3248                 case TOK_SETUP:
3249                         fill_cmd(cmd, O_TCPFLAGS, 0,
3250                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3251                         break;
3252
3253                 case TOK_TCPDATALEN:
3254                         NEED1("tcpdatalen requires length");
3255                         if (strpbrk(*av, "-,")) {
3256                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3257                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3258                         } else
3259                             fill_cmd(cmd, O_TCPDATALEN, 0,
3260                                     strtoul(*av, NULL, 0));
3261                         ac--; av++;
3262                         break;
3263
3264                 case TOK_TCPOPTS:
3265                         NEED1("missing argument for tcpoptions");
3266                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3267                         ac--; av++;
3268                         break;
3269
3270                 case TOK_TCPSEQ:
3271                 case TOK_TCPACK:
3272                         NEED1("tcpseq/tcpack requires argument");
3273                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3274                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3275                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3276                         ac--; av++;
3277                         break;
3278
3279                 case TOK_TCPWIN:
3280                         NEED1("tcpwin requires length");
3281                         fill_cmd(cmd, O_TCPWIN, 0,
3282                             htons(strtoul(*av, NULL, 0)));
3283                         ac--; av++;
3284                         break;
3285
3286                 case TOK_TCPFLAGS:
3287                         NEED1("missing argument for tcpflags");
3288                         cmd->opcode = O_TCPFLAGS;
3289                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3290                         ac--; av++;
3291                         break;
3292
3293                 case TOK_KEEPSTATE:
3294                         if (open_par)
3295                                 errx(EX_USAGE, "keep-state cannot be part "
3296                                     "of an or block");
3297                         if (have_state)
3298                                 errx(EX_USAGE, "only one of keep-state "
3299                                         "and limit is allowed");
3300                         have_state = cmd;
3301                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3302                         break;
3303
3304                 case TOK_LIMIT: {
3305                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3306                         int val;
3307
3308                         if (open_par)
3309                                 errx(EX_USAGE,
3310                                     "limit cannot be part of an or block");
3311                         if (have_state)
3312                                 errx(EX_USAGE, "only one of keep-state and "
3313                                     "limit is allowed");
3314                         have_state = cmd;
3315
3316                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3317                         cmd->opcode = O_LIMIT;
3318                         c->limit_mask = c->conn_limit = 0;
3319
3320                         while (ac > 0) {
3321                                 if ((val = match_token(limit_masks, *av)) <= 0)
3322                                         break;
3323                                 c->limit_mask |= val;
3324                                 ac--; av++;
3325                         }
3326
3327                         if (c->limit_mask == 0)
3328                                 errx(EX_USAGE, "limit: missing limit mask");
3329
3330                         GET_UINT_ARG(c->conn_limit, 1, IPFW_DEFAULT_RULE - 1,
3331                             TOK_LIMIT, rule_options);
3332
3333                         ac--; av++;
3334                         break;
3335                 }
3336
3337                 case TOK_PROTO:
3338                         NEED1("missing protocol");
3339                         if (add_proto(cmd, *av, &proto)) {
3340                                 ac--; av++;
3341                         } else
3342                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3343                                     *av);
3344                         break;
3345
3346                 case TOK_SRCIP:
3347                         NEED1("missing source IP");
3348                         if (add_srcip(cmd, *av)) {
3349                                 ac--; av++;
3350                         }
3351                         break;
3352
3353                 case TOK_DSTIP:
3354                         NEED1("missing destination IP");
3355                         if (add_dstip(cmd, *av)) {
3356                                 ac--; av++;
3357                         }
3358                         break;
3359
3360                 case TOK_SRCIP6:
3361                         NEED1("missing source IP6");
3362                         if (add_srcip6(cmd, *av)) {
3363                                 ac--; av++;
3364                         }
3365                         break;
3366
3367                 case TOK_DSTIP6:
3368                         NEED1("missing destination IP6");
3369                         if (add_dstip6(cmd, *av)) {
3370                                 ac--; av++;
3371                         }
3372                         break;
3373
3374                 case TOK_SRCPORT:
3375                         NEED1("missing source port");
3376                         if (_substrcmp(*av, "any") == 0 ||
3377                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3378                                 ac--; av++;
3379                         } else
3380                                 errx(EX_DATAERR, "invalid source port %s", *av);
3381                         break;
3382
3383                 case TOK_DSTPORT:
3384                         NEED1("missing destination port");
3385                         if (_substrcmp(*av, "any") == 0 ||
3386                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3387                                 ac--; av++;
3388                         } else
3389                                 errx(EX_DATAERR, "invalid destination port %s",
3390                                     *av);
3391                         break;
3392
3393                 case TOK_MAC:
3394                         if (add_mac(cmd, ac, av)) {
3395                                 ac -= 2; av += 2;
3396                         }
3397                         break;
3398
3399                 case TOK_MACTYPE:
3400                         NEED1("missing mac type");
3401                         if (!add_mactype(cmd, ac, *av))
3402                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3403                         ac--; av++;
3404                         break;
3405
3406                 case TOK_VERREVPATH:
3407                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3408                         break;
3409
3410                 case TOK_VERSRCREACH:
3411                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3412                         break;
3413
3414                 case TOK_ANTISPOOF:
3415                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3416                         break;
3417
3418                 case TOK_IPSEC:
3419                         fill_cmd(cmd, O_IPSEC, 0, 0);
3420                         break;
3421
3422                 case TOK_IPV6:
3423                         fill_cmd(cmd, O_IP6, 0, 0);
3424                         break;
3425
3426                 case TOK_IPV4:
3427                         fill_cmd(cmd, O_IP4, 0, 0);
3428                         break;
3429
3430                 case TOK_EXT6HDR:
3431                         fill_ext6hdr( cmd, *av );
3432                         ac--; av++;
3433                         break;
3434
3435                 case TOK_FLOWID:
3436                         if (proto != IPPROTO_IPV6 )
3437                                 errx( EX_USAGE, "flow-id filter is active "
3438                                     "only for ipv6 protocol\n");
3439                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3440                         ac--; av++;
3441                         break;
3442
3443                 case TOK_COMMENT:
3444                         fill_comment(cmd, ac, av);
3445                         av += ac;
3446                         ac = 0;
3447                         break;
3448
3449                 case TOK_TAGGED:
3450                         if (ac > 0 && strpbrk(*av, "-,")) {
3451                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3452                                         errx(EX_DATAERR, "tagged: invalid tag"
3453                                             " list: %s", *av);
3454                         }
3455                         else {
3456                                 uint16_t tag;
3457
3458                                 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1,
3459                                     TOK_TAGGED, rule_options);
3460                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3461                         }
3462                         ac--; av++;
3463                         break;
3464
3465                 case TOK_FIB:
3466                         NEED1("fib requires fib number");
3467                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3468                         ac--; av++;
3469                         break;
3470
3471                 default:
3472                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3473                 }
3474                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3475                         prev = cmd;
3476                         cmd = next_cmd(cmd);
3477                 }
3478         }
3479
3480 done:
3481         /*
3482          * Now copy stuff into the rule.
3483          * If we have a keep-state option, the first instruction
3484          * must be a PROBE_STATE (which is generated here).
3485          * If we have a LOG option, it was stored as the first command,
3486          * and now must be moved to the top of the action part.
3487          */
3488         dst = (ipfw_insn *)rule->cmd;
3489
3490         /*
3491          * First thing to write into the command stream is the match probability.
3492          */
3493         if (match_prob != 1) { /* 1 means always match */
3494                 dst->opcode = O_PROB;
3495                 dst->len = 2;
3496                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3497                 dst += dst->len;
3498         }
3499
3500         /*
3501          * generate O_PROBE_STATE if necessary
3502          */
3503         if (have_state && have_state->opcode != O_CHECK_STATE) {
3504                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3505                 dst = next_cmd(dst);
3506         }
3507
3508         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3509         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3510                 i = F_LEN(src);
3511
3512                 switch (src->opcode) {
3513                 case O_LOG:
3514                 case O_KEEP_STATE:
3515                 case O_LIMIT:
3516                 case O_ALTQ:
3517                 case O_TAG:
3518                         break;
3519                 default:
3520                         bcopy(src, dst, i * sizeof(uint32_t));
3521                         dst += i;
3522                 }
3523         }
3524
3525         /*
3526          * put back the have_state command as last opcode
3527          */
3528         if (have_state && have_state->opcode != O_CHECK_STATE) {
3529                 i = F_LEN(have_state);
3530                 bcopy(have_state, dst, i * sizeof(uint32_t));
3531                 dst += i;
3532         }
3533         /*
3534          * start action section
3535          */
3536         rule->act_ofs = dst - rule->cmd;
3537
3538         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3539         if (have_log) {
3540                 i = F_LEN(have_log);
3541                 bcopy(have_log, dst, i * sizeof(uint32_t));
3542                 dst += i;
3543         }
3544         if (have_altq) {
3545                 i = F_LEN(have_altq);
3546                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3547                 dst += i;
3548         }
3549         if (have_tag) {
3550                 i = F_LEN(have_tag);
3551                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3552                 dst += i;
3553         }
3554         /*
3555          * copy all other actions
3556          */
3557         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3558                 i = F_LEN(src);
3559                 bcopy(src, dst, i * sizeof(uint32_t));
3560                 dst += i;
3561         }
3562
3563         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3564         i = (char *)dst - (char *)rule;
3565         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3566                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3567         if (!co.do_quiet)
3568                 show_ipfw(rule, 0, 0);
3569 }
3570
3571 /*
3572  * clear the counters or the log counters.
3573  */
3574 void
3575 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3576 {
3577         uint32_t arg, saved_arg;
3578         int failed = EX_OK;
3579         char const *errstr;
3580         char const *name = optname ? "RESETLOG" : "ZERO";
3581
3582         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3583
3584         av++; ac--;
3585
3586         if (!ac) {
3587                 /* clear all entries */
3588                 if (do_cmd(optname, NULL, 0) < 0)
3589                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3590                 if (!co.do_quiet)
3591                         printf("%s.\n", optname == IP_FW_ZERO ?
3592                             "Accounting cleared":"Logging counts reset");
3593
3594                 return;
3595         }
3596
3597         while (ac) {
3598                 /* Rule number */
3599                 if (isdigit(**av)) {
3600                         arg = strtonum(*av, 0, 0xffff, &errstr);
3601                         if (errstr)
3602                                 errx(EX_DATAERR,
3603                                     "invalid rule number %s\n", *av);
3604                         saved_arg = arg;
3605                         if (co.use_set)
3606                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3607                         av++;
3608                         ac--;
3609                         if (do_cmd(optname, &arg, sizeof(arg))) {
3610                                 warn("rule %u: setsockopt(IP_FW_%s)",
3611                                     saved_arg, name);
3612                                 failed = EX_UNAVAILABLE;
3613                         } else if (!co.do_quiet)
3614                                 printf("Entry %d %s.\n", saved_arg,
3615                                     optname == IP_FW_ZERO ?
3616                                         "cleared" : "logging count reset");
3617                 } else {
3618                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3619                 }
3620         }
3621         if (failed != EX_OK)
3622                 exit(failed);
3623 }
3624
3625 void
3626 ipfw_flush(int force)
3627 {
3628         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3629
3630         if (!force && !co.do_quiet) { /* need to ask user */
3631                 int c;
3632
3633                 printf("Are you sure? [yn] ");
3634                 fflush(stdout);
3635                 do {
3636                         c = toupper(getc(stdin));
3637                         while (c != '\n' && getc(stdin) != '\n')
3638                                 if (feof(stdin))
3639                                         return; /* and do not flush */
3640                 } while (c != 'Y' && c != 'N');
3641                 printf("\n");
3642                 if (c == 'N')   /* user said no */
3643                         return;
3644         }
3645         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3646         if (co.use_set) {
3647                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3648                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3649                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3650         } else if (do_cmd(cmd, NULL, 0) < 0)
3651                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3652                     co.do_pipe ? "DUMMYNET" : "FW");
3653         if (!co.do_quiet)
3654                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3655 }
3656
3657
3658 static void table_list(ipfw_table_entry ent, int need_header);
3659
3660 /*
3661  * This one handles all table-related commands
3662  *      ipfw table N add addr[/masklen] [value]
3663  *      ipfw table N delete addr[/masklen]
3664  *      ipfw table {N | all} flush
3665  *      ipfw table {N | all} list
3666  */
3667 void
3668 ipfw_table_handler(int ac, char *av[])
3669 {
3670         ipfw_table_entry ent;
3671         int do_add;
3672         int is_all;
3673         size_t len;
3674         char *p;
3675         uint32_t a;
3676         uint32_t tables_max;
3677
3678         len = sizeof(tables_max);
3679         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3680                 NULL, 0) == -1) {
3681 #ifdef IPFW_TABLES_MAX
3682                 warn("Warn: Failed to get the max tables number via sysctl. "
3683                      "Using the compiled in defaults. \nThe reason was");
3684                 tables_max = IPFW_TABLES_MAX;
3685 #else
3686                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3687 #endif
3688         }
3689
3690         ac--; av++;
3691         if (ac && isdigit(**av)) {
3692                 ent.tbl = atoi(*av);
3693                 is_all = 0;
3694                 ac--; av++;
3695         } else if (ac && _substrcmp(*av, "all") == 0) {
3696                 ent.tbl = 0;
3697                 is_all = 1;
3698                 ac--; av++;
3699         } else
3700                 errx(EX_USAGE, "table number or 'all' keyword required");
3701         if (ent.tbl >= tables_max)
3702                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3703                         "value (%d)", tables_max - 1);
3704         NEED1("table needs command");
3705         if (is_all && _substrcmp(*av, "list") != 0
3706                    && _substrcmp(*av, "flush") != 0)
3707                 errx(EX_USAGE, "table number required");
3708
3709         if (_substrcmp(*av, "add") == 0 ||
3710             _substrcmp(*av, "delete") == 0) {
3711                 do_add = **av == 'a';
3712                 ac--; av++;
3713                 if (!ac)
3714                         errx(EX_USAGE, "IP address required");
3715                 p = strchr(*av, '/');
3716                 if (p) {
3717                         *p++ = '\0';
3718                         ent.masklen = atoi(p);
3719                         if (ent.masklen > 32)
3720                                 errx(EX_DATAERR, "bad width ``%s''", p);
3721                 } else
3722                         ent.masklen = 32;
3723                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3724                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3725                 ac--; av++;
3726                 if (do_add && ac) {
3727                         unsigned int tval;
3728                         /* isdigit is a bit of a hack here.. */
3729                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3730                                 ent.value = strtoul(*av, NULL, 0);
3731                         } else {
3732                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3733                                         /* The value must be stored in host order        *
3734                                          * so that the values < 65k can be distinguished */
3735                                         ent.value = ntohl(tval);
3736                                 } else {
3737                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3738                                 }
3739                         }
3740                 } else
3741                         ent.value = 0;
3742                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3743                     &ent, sizeof(ent)) < 0) {
3744                         /* If running silent, don't bomb out on these errors. */
3745                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3746                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3747                                     do_add ? "ADD" : "DEL");
3748                         /* In silent mode, react to a failed add by deleting */
3749                         if (do_add) {
3750                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3751                                 if (do_cmd(IP_FW_TABLE_ADD,
3752                                     &ent, sizeof(ent)) < 0)
3753                                         err(EX_OSERR,
3754                                             "setsockopt(IP_FW_TABLE_ADD)");
3755                         }
3756                 }
3757         } else if (_substrcmp(*av, "flush") == 0) {
3758                 a = is_all ? tables_max : (ent.tbl + 1);
3759                 do {
3760                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3761                             sizeof(ent.tbl)) < 0)
3762                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3763                 } while (++ent.tbl < a);
3764         } else if (_substrcmp(*av, "list") == 0) {
3765                 a = is_all ? tables_max : (ent.tbl + 1);
3766                 do {
3767                         table_list(ent, is_all);
3768                 } while (++ent.tbl < a);
3769         } else
3770                 errx(EX_USAGE, "invalid table command %s", *av);
3771 }
3772
3773 static void
3774 table_list(ipfw_table_entry ent, int need_header)
3775 {
3776         ipfw_table *tbl;
3777         socklen_t l;
3778         uint32_t a;
3779
3780         a = ent.tbl;
3781         l = sizeof(a);
3782         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3783                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3784
3785         /* If a is zero we have nothing to do, the table is empty. */
3786         if (a == 0)
3787                 return;
3788
3789         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3790         tbl = safe_calloc(1, l);
3791         tbl->tbl = ent.tbl;
3792         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3793                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3794         if (tbl->cnt && need_header)
3795                 printf("---table(%d)---\n", tbl->tbl);
3796         for (a = 0; a < tbl->cnt; a++) {
3797                 unsigned int tval;
3798                 tval = tbl->ent[a].value;
3799                 if (co.do_value_as_ip) {
3800                         char tbuf[128];
3801                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3802                                 &tbl->ent[a].addr), 127);
3803                         /* inet_ntoa expects network order */
3804                         tval = htonl(tval);
3805                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3806                                 inet_ntoa(*(struct in_addr *)&tval));
3807                 } else {
3808                         printf("%s/%u %u\n",
3809                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3810                                 tbl->ent[a].masklen, tval);
3811                 }
3812         }
3813         free(tbl);
3814 }