sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002 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: src/sbin/ipfw/ipfw2.c,v 1.4.2.13 2003/05/27 22:21:11 gshapiro Exp $
  21  */
  22
  23 #include <sys/param.h>
  24 #include <sys/mbuf.h>
  25 #include <sys/socket.h>
  26 #include <sys/sockio.h>
  27 #include <sys/sysctl.h>
  28 #include <sys/time.h>
  29 #include <sys/wait.h>
  30
  31 #include <ctype.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <grp.h>
  35 #include <limits.h>
  36 #include <netdb.h>
  37 #include <pwd.h>
  38 #include <signal.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <stdarg.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44 #include <sysexits.h>
  45
  46 #include <net/if.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <net/ipfw/ip_fw.h>
  52 #include <net/route.h> /* def. of struct route */
  53 #include <net/ethernet.h>
  54 #include <net/dummynet/ip_dummynet.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57
  58 int             s,                      /* main RAW socket */
  59                 do_resolv,              /* Would try to resolve all */
  60                 do_acct,                /* Show packet/byte count */
  61                 do_time,                /* Show time stamps */
  62                 do_quiet,               /* Be quiet in add and flush */
  63                 do_force,               /* Don't ask for confirmation */
  64                 do_pipe,                /* this cmd refers to a pipe */
  65                 do_sort,                /* field to sort results (0 = no) */
  66                 do_dynamic,             /* display dynamic rules */
  67                 do_expired,             /* display expired dynamic rules */
  68                 do_compact,             /* show rules in compact mode */
  69                 show_sets,              /* display rule sets */
  70                 verbose;
  71
  72 #define IP_MASK_ALL     0xffffffff
  73
  74 /*
  75  * structure to hold flag names and associated values to be
  76  * set in the appropriate masks.
  77  * A NULL string terminates the array.
  78  * Often, an element with 0 value contains an error string.
  79  *
  80  */
  81 struct _s_x {
  82         char *s;
  83         int x;
  84 };
  85
  86 static struct _s_x f_tcpflags[] = {
  87         { "syn", TH_SYN },
  88         { "fin", TH_FIN },
  89         { "ack", TH_ACK },
  90         { "psh", TH_PUSH },
  91         { "rst", TH_RST },
  92         { "urg", TH_URG },
  93         { "tcp flag", 0 },
  94         { NULL, 0 }
  95 };
  96
  97 static struct _s_x f_tcpopts[] = {
  98         { "mss",        IP_FW_TCPOPT_MSS },
  99         { "maxseg",     IP_FW_TCPOPT_MSS },
 100         { "window",     IP_FW_TCPOPT_WINDOW },
 101         { "sack",       IP_FW_TCPOPT_SACK },
 102         { "ts",         IP_FW_TCPOPT_TS },
 103         { "timestamp",  IP_FW_TCPOPT_TS },
 104         { "cc",         IP_FW_TCPOPT_CC },
 105         { "tcp option", 0 },
 106         { NULL, 0 }
 107 };
 108
 109 /*
 110  * IP options span the range 0 to 255 so we need to remap them
 111  * (though in fact only the low 5 bits are significant).
 112  */
 113 static struct _s_x f_ipopts[] = {
 114         { "ssrr",       IP_FW_IPOPT_SSRR},
 115         { "lsrr",       IP_FW_IPOPT_LSRR},
 116         { "rr",         IP_FW_IPOPT_RR},
 117         { "ts",         IP_FW_IPOPT_TS},
 118         { "ip option",  0 },
 119         { NULL, 0 }
 120 };
 121
 122 static struct _s_x f_iptos[] = {
 123         { "lowdelay",   IPTOS_LOWDELAY},
 124         { "throughput", IPTOS_THROUGHPUT},
 125         { "reliability", IPTOS_RELIABILITY},
 126         { "mincost",    IPTOS_MINCOST},
 127         { "congestion", IPTOS_CE},
 128         { "ecntransport", IPTOS_ECT},
 129         { "ip tos option", 0},
 130         { NULL, 0 }
 131 };
 132
 133 static struct _s_x limit_masks[] = {
 134         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 135         {"src-addr",    DYN_SRC_ADDR},
 136         {"src-port",    DYN_SRC_PORT},
 137         {"dst-addr",    DYN_DST_ADDR},
 138         {"dst-port",    DYN_DST_PORT},
 139         {NULL,          0}
 140 };
 141
 142 /*
 143  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 144  * This is only used in this code.
 145  */
 146 #define IPPROTO_ETHERTYPE       0x1000
 147 static struct _s_x ether_types[] = {
 148     /*
 149      * Note, we cannot use "-:&/" in the names because they are field
 150      * separators in the type specifications. Also, we use s = NULL as
 151      * end-delimiter, because a type of 0 can be legal.
 152      */
 153         { "ip",         0x0800 },
 154         { "ipv4",       0x0800 },
 155         { "ipv6",       0x86dd },
 156         { "arp",        0x0806 },
 157         { "rarp",       0x8035 },
 158         { "vlan",       0x8100 },
 159         { "loop",       0x9000 },
 160         { "trail",      0x1000 },
 161         { "pppoe_disc", 0x8863 },
 162         { "pppoe_sess", 0x8864 },
 163         { "ipx_8022",   0x00E0 },
 164         { "ipx_8023",   0x0000 },
 165         { "ipx_ii",     0x8137 },
 166         { "ipx_snap",   0x8137 },
 167         { "ipx",        0x8137 },
 168         { "ns",         0x0600 },
 169         { NULL,         0 }
 170 };
 171
 172 static void show_usage(void);
 173
 174 enum tokens {
 175         TOK_NULL=0,
 176
 177         TOK_OR,
 178         TOK_NOT,
 179         TOK_STARTBRACE,
 180         TOK_ENDBRACE,
 181
 182         TOK_ACCEPT,
 183         TOK_COUNT,
 184         TOK_PIPE,
 185         TOK_QUEUE,
 186         TOK_DIVERT,
 187         TOK_TEE,
 188         TOK_FORWARD,
 189         TOK_SKIPTO,
 190         TOK_DENY,
 191         TOK_REJECT,
 192         TOK_RESET,
 193         TOK_UNREACH,
 194         TOK_CHECKSTATE,
 195
 196         TOK_UID,
 197         TOK_GID,
 198         TOK_IN,
 199         TOK_LIMIT,
 200         TOK_KEEPSTATE,
 201         TOK_LAYER2,
 202         TOK_OUT,
 203         TOK_XMIT,
 204         TOK_RECV,
 205         TOK_VIA,
 206         TOK_FRAG,
 207         TOK_IPOPTS,
 208         TOK_IPLEN,
 209         TOK_IPID,
 210         TOK_IPPRECEDENCE,
 211         TOK_IPTOS,
 212         TOK_IPTTL,
 213         TOK_IPVER,
 214         TOK_ESTAB,
 215         TOK_SETUP,
 216         TOK_TCPFLAGS,
 217         TOK_TCPOPTS,
 218         TOK_TCPSEQ,
 219         TOK_TCPACK,
 220         TOK_TCPWIN,
 221         TOK_ICMPTYPES,
 222         TOK_MAC,
 223         TOK_MACTYPE,
 224
 225         TOK_PLR,
 226         TOK_NOERROR,
 227         TOK_BUCKETS,
 228         TOK_DSTIP,
 229         TOK_SRCIP,
 230         TOK_DSTPORT,
 231         TOK_SRCPORT,
 232         TOK_ALL,
 233         TOK_MASK,
 234         TOK_BW,
 235         TOK_DELAY,
 236         TOK_RED,
 237         TOK_GRED,
 238         TOK_DROPTAIL,
 239         TOK_PROTO,
 240         TOK_WEIGHT,
 241 };
 242
 243 struct _s_x dummynet_params[] = {
 244         { "plr",                TOK_PLR },
 245         { "noerror",            TOK_NOERROR },
 246         { "buckets",            TOK_BUCKETS },
 247         { "dst-ip",             TOK_DSTIP },
 248         { "src-ip",             TOK_SRCIP },
 249         { "dst-port",           TOK_DSTPORT },
 250         { "src-port",           TOK_SRCPORT },
 251         { "proto",              TOK_PROTO },
 252         { "weight",             TOK_WEIGHT },
 253         { "all",                TOK_ALL },
 254         { "mask",               TOK_MASK },
 255         { "droptail",           TOK_DROPTAIL },
 256         { "red",                TOK_RED },
 257         { "gred",               TOK_GRED },
 258         { "bw",                 TOK_BW },
 259         { "bandwidth",          TOK_BW },
 260         { "delay",              TOK_DELAY },
 261         { "pipe",               TOK_PIPE },
 262         { "queue",              TOK_QUEUE },
 263         { "dummynet-params",    TOK_NULL },
 264         { NULL, 0 }
 265 };
 266
 267 struct _s_x rule_actions[] = {
 268         { "accept",             TOK_ACCEPT },
 269         { "pass",               TOK_ACCEPT },
 270         { "allow",              TOK_ACCEPT },
 271         { "permit",             TOK_ACCEPT },
 272         { "count",              TOK_COUNT },
 273         { "pipe",               TOK_PIPE },
 274         { "queue",              TOK_QUEUE },
 275         { "divert",             TOK_DIVERT },
 276         { "tee",                TOK_TEE },
 277         { "fwd",                TOK_FORWARD },
 278         { "forward",            TOK_FORWARD },
 279         { "skipto",             TOK_SKIPTO },
 280         { "deny",               TOK_DENY },
 281         { "drop",               TOK_DENY },
 282         { "reject",             TOK_REJECT },
 283         { "reset",              TOK_RESET },
 284         { "unreach",            TOK_UNREACH },
 285         { "check-state",        TOK_CHECKSTATE },
 286         { NULL,                 TOK_NULL },
 287         { NULL, 0 }
 288 };
 289
 290 struct _s_x rule_options[] = {
 291         { "uid",                TOK_UID },
 292         { "gid",                TOK_GID },
 293         { "in",                 TOK_IN },
 294         { "limit",              TOK_LIMIT },
 295         { "keep-state",         TOK_KEEPSTATE },
 296         { "layer2",             TOK_LAYER2 },
 297         { "out",                TOK_OUT },
 298         { "xmit",               TOK_XMIT },
 299         { "recv",               TOK_RECV },
 300         { "via",                TOK_VIA },
 301         { "fragment",           TOK_FRAG },
 302         { "frag",               TOK_FRAG },
 303         { "ipoptions",          TOK_IPOPTS },
 304         { "ipopts",             TOK_IPOPTS },
 305         { "iplen",              TOK_IPLEN },
 306         { "ipid",               TOK_IPID },
 307         { "ipprecedence",       TOK_IPPRECEDENCE },
 308         { "iptos",              TOK_IPTOS },
 309         { "ipttl",              TOK_IPTTL },
 310         { "ipversion",          TOK_IPVER },
 311         { "ipver",              TOK_IPVER },
 312         { "estab",              TOK_ESTAB },
 313         { "established",        TOK_ESTAB },
 314         { "setup",              TOK_SETUP },
 315         { "tcpflags",           TOK_TCPFLAGS },
 316         { "tcpflgs",            TOK_TCPFLAGS },
 317         { "tcpoptions",         TOK_TCPOPTS },
 318         { "tcpopts",            TOK_TCPOPTS },
 319         { "tcpseq",             TOK_TCPSEQ },
 320         { "tcpack",             TOK_TCPACK },
 321         { "tcpwin",             TOK_TCPWIN },
 322         { "icmptype",           TOK_ICMPTYPES },
 323         { "icmptypes",          TOK_ICMPTYPES },
 324         { "dst-ip",             TOK_DSTIP },
 325         { "src-ip",             TOK_SRCIP },
 326         { "dst-port",           TOK_DSTPORT },
 327         { "src-port",           TOK_SRCPORT },
 328         { "proto",              TOK_PROTO },
 329         { "MAC",                TOK_MAC },
 330         { "mac",                TOK_MAC },
 331         { "mac-type",           TOK_MACTYPE },
 332
 333         { "not",                TOK_NOT },              /* pseudo option */
 334         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 335         { "or",                 TOK_OR },               /* pseudo option */
 336         { "|", /* escape */     TOK_OR },               /* pseudo option */
 337         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 338         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 339         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 340         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 341         { NULL,                 TOK_NULL },
 342         { NULL, 0 }
 343 };
 344
 345 /**
 346  * match_token takes a table and a string, returns the value associated
 347  * with the string (0 meaning an error in most cases)
 348  */
 349 static int
 350 match_token(struct _s_x *table, char *string)
 351 {
 352         struct _s_x *pt;
 353         int i = strlen(string);
 354
 355         for (pt = table ; i && pt->s != NULL ; pt++)
 356                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 357                         return pt->x;
 358         return -1;
 359 };
 360
 361 static char *
 362 match_value(struct _s_x *p, u_int32_t value)
 363 {
 364         for (; p->s != NULL; p++)
 365                 if (p->x == value)
 366                         return p->s;
 367         return NULL;
 368 }
 369
 370 /*
 371  * prints one port, symbolic or numeric
 372  */
 373 static void
 374 print_port(int proto, u_int16_t port)
 375 {
 376
 377         if (proto == IPPROTO_ETHERTYPE) {
 378                 char *s;
 379
 380                 if (do_resolv && (s = match_value(ether_types, port)) )
 381                         printf("%s", s);
 382                 else
 383                         printf("0x%04x", port);
 384         } else {
 385                 struct servent *se = NULL;
 386                 if (do_resolv) {
 387                         struct protoent *pe = getprotobynumber(proto);
 388
 389                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 390                 }
 391                 if (se)
 392                         printf("%s", se->s_name);
 393                 else
 394                         printf("%d", port);
 395         }
 396 }
 397
 398 /*
 399  * print the values in a list of ports
 400  * XXX todo: add support for mask.
 401  */
 402 static void
 403 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 404 {
 405         u_int16_t *p = cmd->ports;
 406         int i;
 407         char *sep= " ";
 408
 409         if (cmd->o.len & F_NOT)
 410                 printf(" not");
 411         if (opcode != 0)
 412                 printf ("%s", opcode == O_MAC_TYPE ? " mac-type" :
 413                     (opcode == O_IP_DSTPORT ? " dst-port" : " src-port"));
 414         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 415                 printf(sep);
 416                 print_port(proto, p[0]);
 417                 if (p[0] != p[1]) {
 418                         printf("-");
 419                         print_port(proto, p[1]);
 420                 }
 421                 sep = ",";
 422         }
 423 }
 424
 425 /*
 426  * Like strtol, but also translates service names into port numbers
 427  * for some protocols.
 428  * In particular:
 429  *      proto == -1 disables the protocol check;
 430  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 431  *      proto == <some value in /etc/protocols> matches the values there.
 432  * Returns *end == s in case the parameter is not found.
 433  */
 434 static int
 435 strtoport(char *s, char **end, int base, int proto)
 436 {
 437         char *p, *buf;
 438         char *s1;
 439         int i;
 440
 441         *end = s;               /* default - not found */
 442         if ( *s == '\0')
 443                 return 0;       /* not found */
 444
 445         if (isdigit(*s))
 446                 return strtol(s, end, base);
 447
 448         /*
 449          * find separator. '\\' escapes the next char.
 450          */
 451         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 452                 if (*s1 == '\\' && s1[1] != '\0')
 453                         s1++;
 454
 455         buf = malloc(s1 - s + 1);
 456         if (buf == NULL)
 457                 return 0;
 458
 459         /*
 460          * copy into a buffer skipping backslashes
 461          */
 462         for (p = s, i = 0; p != s1 ; p++)
 463                 if ( *p != '\\')
 464                         buf[i++] = *p;
 465         buf[i++] = '\0';
 466
 467         if (proto == IPPROTO_ETHERTYPE) {
 468                 i = match_token(ether_types, buf);
 469                 free(buf);
 470                 if (i != -1) {  /* found */
 471                         *end = s1;
 472                         return i;
 473                 }
 474         } else {
 475                 struct protoent *pe = NULL;
 476                 struct servent *se;
 477
 478                 if (proto != 0)
 479                         pe = getprotobynumber(proto);
 480                 setservent(1);
 481                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 482                 free(buf);
 483                 if (se != NULL) {
 484                         *end = s1;
 485                         return ntohs(se->s_port);
 486                 }
 487         }
 488         return 0;       /* not found */
 489 }
 490
 491 /*
 492  * fill the body of the command with the list of port ranges.
 493  * At the moment it only understands numeric ranges.
 494  */
 495 static int
 496 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 497 {
 498         u_int16_t *p = cmd->ports;
 499         int i = 0;
 500         char *s = av;
 501
 502         while (*s) {
 503                 u_int16_t a, b;
 504
 505                 a = strtoport(av, &s, 0, proto);
 506                 if (s == av) /* no parameter */
 507                         break;
 508                 if (*s == '-') { /* a range */
 509                         av = s+1;
 510                         b = strtoport(av, &s, 0, proto);
 511                         if (s == av) /* no parameter */
 512                                 break;
 513                         p[0] = a;
 514                         p[1] = b;
 515                 } else if (*s == ',' || *s == '\0' ) {
 516                         p[0] = p[1] = a;
 517                 } else {        /* invalid separator */
 518                         errx(EX_DATAERR, "invalid separator <%c> in <%s>\n",
 519                                 *s, av);
 520                 }
 521                 i++;
 522                 p += 2;
 523                 av = s+1;
 524         }
 525         if (i > 0) {
 526                 if (i+1 > F_LEN_MASK)
 527                         errx(EX_DATAERR, "too many ports/ranges\n");
 528                 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
 529         }
 530         return i;
 531 }
 532
 533 static struct _s_x icmpcodes[] = {
 534       { "net",                  ICMP_UNREACH_NET },
 535       { "host",                 ICMP_UNREACH_HOST },
 536       { "protocol",             ICMP_UNREACH_PROTOCOL },
 537       { "port",                 ICMP_UNREACH_PORT },
 538       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 539       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 540       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 541       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 542       { "isolated",             ICMP_UNREACH_ISOLATED },
 543       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 544       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 545       { "tosnet",               ICMP_UNREACH_TOSNET },
 546       { "toshost",              ICMP_UNREACH_TOSHOST },
 547       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 548       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 549       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 550       { NULL, 0 }
 551 };
 552
 553 static void
 554 fill_reject_code(u_short *codep, char *str)
 555 {
 556         int val;
 557         char *s;
 558
 559         val = strtoul(str, &s, 0);
 560         if (s == str || *s != '\0' || val >= 0x100)
 561                 val = match_token(icmpcodes, str);
 562         if (val < 0)
 563                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 564         *codep = val;
 565         return;
 566 }
 567
 568 static void
 569 print_reject_code(u_int16_t code)
 570 {
 571         char *s = match_value(icmpcodes, code);
 572
 573         if (s != NULL)
 574                 printf("unreach %s", s);
 575         else
 576                 printf("unreach %u", code);
 577 }
 578
 579 /*
 580  * Returns the number of bits set (from left) in a contiguous bitmask,
 581  * or -1 if the mask is not contiguous.
 582  * XXX this needs a proper fix.
 583  * This effectively works on masks in big-endian (network) format.
 584  * when compiled on little endian architectures.
 585  *
 586  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 587  * the first bit on the wire is bit 0 of the first byte.
 588  * len is the max length in bits.
 589  */
 590 static int
 591 contigmask(u_char *p, int len)
 592 {
 593         int i, n;
 594         for (i=0; i<len ; i++)
 595                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 596                         break;
 597         for (n=i+1; n < len; n++)
 598                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 599                         return -1; /* mask not contiguous */
 600         return i;
 601 }
 602
 603 /*
 604  * print flags set/clear in the two bitmasks passed as parameters.
 605  * There is a specialized check for f_tcpflags.
 606  */
 607 static void
 608 print_flags(char *name, ipfw_insn *cmd, struct _s_x *list)
 609 {
 610         char *comma="";
 611         int i;
 612         u_char set = cmd->arg1 & 0xff;
 613         u_char clear = (cmd->arg1 >> 8) & 0xff;
 614
 615         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 616                 printf(" setup");
 617                 return;
 618         }
 619
 620         printf(" %s ", name);
 621         for (i=0; list[i].x != 0; i++) {
 622                 if (set & list[i].x) {
 623                         set &= ~list[i].x;
 624                         printf("%s%s", comma, list[i].s);
 625                         comma = ",";
 626                 }
 627                 if (clear & list[i].x) {
 628                         clear &= ~list[i].x;
 629                         printf("%s!%s", comma, list[i].s);
 630                         comma = ",";
 631                 }
 632         }
 633 }
 634
 635 /*
 636  * Print the ip address contained in a command.
 637  */
 638 static void
 639 print_ip(ipfw_insn_ip *cmd, char *s)
 640 {
 641         struct hostent *he = NULL;
 642         int mb;
 643
 644         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 645
 646         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 647                 printf("me");
 648                 return;
 649         }
 650         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 651                 u_int32_t x, *d;
 652                 int i;
 653                 char comma = '{';
 654
 655                 x = cmd->o.arg1 - 1;
 656                 x = htonl( ~x );
 657                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 658                 printf("%s/%d", inet_ntoa(cmd->addr),
 659                         contigmask((u_char *)&x, 32));
 660                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 661                 x &= 0xff; /* base */
 662                 d = (u_int32_t *)&(cmd->mask);
 663                 for (i=0; i < cmd->o.arg1; i++)
 664                         if (d[ i/32] & (1<<(i & 31))) {
 665                                 printf("%c%d", comma, i+x);
 666                                 comma = ',';
 667                         }
 668                 printf("}");
 669                 return;
 670         }
 671         if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
 672                 mb = 32;
 673         else
 674                 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
 675         if (mb == 32 && do_resolv)
 676                 he = gethostbyaddr(&(cmd->addr.s_addr), sizeof(u_long),
 677                     AF_INET);
 678         if (he != NULL)         /* resolved to name */
 679                 printf("%s", he->h_name);
 680         else if (mb == 0)       /* any */
 681                 printf("any");
 682         else {          /* numeric IP followed by some kind of mask */
 683                 printf("%s", inet_ntoa(cmd->addr));
 684                 if (mb < 0)
 685                         printf(":%s", inet_ntoa(cmd->mask));
 686                 else if (mb < 32)
 687                         printf("/%d", mb);
 688         }
 689 }
 690
 691 /*
 692  * prints a MAC address/mask pair
 693  */
 694 static void
 695 print_mac(u_char *addr, u_char *mask)
 696 {
 697         int l = contigmask(mask, 48);
 698
 699         if (l == 0)
 700                 printf(" any");
 701         else {
 702                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 703                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 704                 if (l == -1)
 705                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 706                             mask[0], mask[1], mask[2],
 707                             mask[3], mask[4], mask[5]);
 708                 else if (l < 48)
 709                         printf("/%d", l);
 710         }
 711 }
 712
 713 static void
 714 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 715 {
 716         u_int8_t type;
 717
 718         cmd->d[0] = 0;
 719         while (*av) {
 720                 if (*av == ',')
 721                         av++;
 722
 723                 type = strtoul(av, &av, 0);
 724
 725                 if (*av != ',' && *av != '\0')
 726                         errx(EX_DATAERR, "invalid ICMP type");
 727
 728                 if (type > 31)
 729                         errx(EX_DATAERR, "ICMP type out of range");
 730
 731                 cmd->d[0] |= 1 << type;
 732         }
 733         cmd->o.opcode = O_ICMPTYPE;
 734         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 735 }
 736
 737 static void
 738 print_icmptypes(ipfw_insn_u32 *cmd)
 739 {
 740         int i;
 741         char sep= ' ';
 742
 743         printf(" icmptypes");
 744         for (i = 0; i < 32; i++) {
 745                 if ( (cmd->d[0] & (1 << (i))) == 0)
 746                         continue;
 747                 printf("%c%d", sep, i);
 748                 sep = ',';
 749         }
 750 }
 751
 752 /*
 753  * show_ipfw() prints the body of an ipfw rule.
 754  * Because the standard rule has at least proto src_ip dst_ip, we use
 755  * a helper function to produce these entries if not provided explicitly.
 756  * The first argument is the list of fields we have, the second is
 757  * the list of fields we want to be printed.
 758  *
 759  * Special cases if we have provided a MAC header:
 760  *   + if the rule does not contain IP addresses/ports, do not print them;
 761  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 762  *
 763  * Once we have 'have_options', IP header fields are printed as options.
 764  */
 765 #define HAVE_PROTO      0x0001
 766 #define HAVE_SRCIP      0x0002
 767 #define HAVE_DSTIP      0x0004
 768 #define HAVE_MAC        0x0008
 769 #define HAVE_MACTYPE    0x0010
 770 #define HAVE_OPTIONS    0x8000
 771
 772 #define HAVE_IP         (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
 773 static void
 774 show_prerequisites(int *flags, int want, int cmd)
 775 {
 776         if ( (*flags & HAVE_IP) == HAVE_IP)
 777                 *flags |= HAVE_OPTIONS;
 778
 779         if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC &&
 780              cmd != O_MAC_TYPE) {
 781                 /*
 782                  * mac-type was optimized out by the compiler,
 783                  * restore it
 784                  */
 785                 printf(" any");
 786                 *flags |= HAVE_MACTYPE | HAVE_OPTIONS;
 787                 return;
 788         }
 789         if ( !(*flags & HAVE_OPTIONS)) {
 790                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
 791                         printf(" ip");
 792                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 793                         printf(" from any");
 794                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 795                         printf(" to any");
 796         }
 797         *flags |= want;
 798 }
 799
 800 static void
 801 show_ipfw(struct ipfw_ioc_rule *rule, int pcwidth, int bcwidth)
 802 {
 803         static int twidth = 0;
 804         int l;
 805         ipfw_insn *cmd;
 806         int proto = 0;          /* default */
 807         int flags = 0;  /* prerequisites */
 808         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 809         int or_block = 0;       /* we are in an or block */
 810
 811         u_int32_t set_disable = rule->set_disable;
 812
 813         if (set_disable & (1 << rule->set)) { /* disabled */
 814                 if (!show_sets)
 815                         return;
 816                 else
 817                         printf("# DISABLED ");
 818         }
 819         printf("%05u ", rule->rulenum);
 820
 821         if (do_acct)
 822                 printf("%*llu %*llu ", pcwidth, rule->pcnt, bcwidth,
 823                     rule->bcnt);
 824
 825         if (do_time) {
 826                 char timestr[30];
 827
 828                 if (twidth == 0) {
 829                         strcpy(timestr, ctime((time_t *)&twidth));
 830                         *strchr(timestr, '\n') = '\0';
 831                         twidth = strlen(timestr);
 832                 }
 833                 if (rule->timestamp) {
 834 #if _FreeBSD_version < 500000 /* XXX check */
 835 #define _long_to_time(x)        (time_t)(x)
 836 #endif
 837                         time_t t = _long_to_time(rule->timestamp);
 838
 839                         strcpy(timestr, ctime(&t));
 840                         *strchr(timestr, '\n') = '\0';
 841                         printf("%s ", timestr);
 842                 } else {
 843                         printf("%*s ", twidth, " ");
 844                 }
 845         }
 846
 847         if (show_sets)
 848                 printf("set %d ", rule->set);
 849
 850         /*
 851          * print the optional "match probability"
 852          */
 853         if (rule->cmd_len > 0) {
 854                 cmd = rule->cmd ;
 855                 if (cmd->opcode == O_PROB) {
 856                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 857                         double d = 1.0 * p->d[0];
 858
 859                         d = (d / 0x7fffffff);
 860                         printf("prob %f ", d);
 861                 }
 862         }
 863
 864         /*
 865          * first print actions
 866          */
 867         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 868                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 869                 switch(cmd->opcode) {
 870                 case O_CHECK_STATE:
 871                         printf("check-state");
 872                         flags = HAVE_IP; /* avoid printing anything else */
 873                         break;
 874
 875                 case O_ACCEPT:
 876                         printf("allow");
 877                         break;
 878
 879                 case O_COUNT:
 880                         printf("count");
 881                         break;
 882
 883                 case O_DENY:
 884                         printf("deny");
 885                         break;
 886
 887                 case O_REJECT:
 888                         if (cmd->arg1 == ICMP_REJECT_RST)
 889                                 printf("reset");
 890                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
 891                                 printf("reject");
 892                         else
 893                                 print_reject_code(cmd->arg1);
 894                         break;
 895
 896                 case O_SKIPTO:
 897                         printf("skipto %u", cmd->arg1);
 898                         break;
 899
 900                 case O_PIPE:
 901                         printf("pipe %u", cmd->arg1);
 902                         break;
 903
 904                 case O_QUEUE:
 905                         printf("queue %u", cmd->arg1);
 906                         break;
 907
 908                 case O_DIVERT:
 909                         printf("divert %u", cmd->arg1);
 910                         break;
 911
 912                 case O_TEE:
 913                         printf("tee %u", cmd->arg1);
 914                         break;
 915
 916                 case O_FORWARD_IP:
 917                     {
 918                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
 919
 920                         printf("fwd %s", inet_ntoa(s->sa.sin_addr));
 921                         if (s->sa.sin_port)
 922                                 printf(",%d", s->sa.sin_port);
 923                     }
 924                         break;
 925
 926                 case O_LOG: /* O_LOG is printed last */
 927                         logptr = (ipfw_insn_log *)cmd;
 928                         break;
 929
 930                 default:
 931                         printf("** unrecognized action %d len %d",
 932                                 cmd->opcode, cmd->len);
 933                 }
 934         }
 935         if (logptr) {
 936                 if (logptr->max_log > 0)
 937                         printf(" log logamount %d", logptr->max_log);
 938                 else
 939                         printf(" log");
 940         }
 941
 942         /*
 943          * then print the body.
 944          */
 945         if (rule->usr_flags & IPFW_USR_F_NORULE) {
 946                 /* empty rules before options */
 947                 if (!do_compact)
 948                         printf(" ip from any to any");
 949                 flags |= HAVE_IP | HAVE_OPTIONS;
 950         }
 951
 952         for (l = rule->act_ofs, cmd = rule->cmd ;
 953                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
 954                 /* useful alias */
 955                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
 956
 957                 show_prerequisites(&flags, 0, cmd->opcode);
 958
 959                 switch(cmd->opcode) {
 960                 case O_PROB:
 961                         break;  /* done already */
 962
 963                 case O_PROBE_STATE:
 964                         break; /* no need to print anything here */
 965
 966                 case O_MACADDR2: {
 967                         ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
 968
 969                         if ((cmd->len & F_OR) && !or_block)
 970                                 printf(" {");
 971                         if (cmd->len & F_NOT)
 972                                 printf(" not");
 973                         printf(" MAC");
 974                         flags |= HAVE_MAC;
 975                         print_mac( m->addr, m->mask);
 976                         print_mac( m->addr + 6, m->mask + 6);
 977                         }
 978                         break;
 979
 980                 case O_MAC_TYPE:
 981                         if ((cmd->len & F_OR) && !or_block)
 982                                 printf(" {");
 983                         print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE,
 984                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
 985                         flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS;
 986                         break;
 987
 988                 case O_IP_SRC:
 989                 case O_IP_SRC_MASK:
 990                 case O_IP_SRC_ME:
 991                 case O_IP_SRC_SET:
 992                         show_prerequisites(&flags, HAVE_PROTO, 0);
 993                         if (!(flags & HAVE_SRCIP))
 994                                 printf(" from");
 995                         if ((cmd->len & F_OR) && !or_block)
 996                                 printf(" {");
 997                         print_ip((ipfw_insn_ip *)cmd,
 998                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
 999                         flags |= HAVE_SRCIP;
1000                         break;
1001
1002                 case O_IP_DST:
1003                 case O_IP_DST_MASK:
1004                 case O_IP_DST_ME:
1005                 case O_IP_DST_SET:
1006                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1007                         if (!(flags & HAVE_DSTIP))
1008                                 printf(" to");
1009                         if ((cmd->len & F_OR) && !or_block)
1010                                 printf(" {");
1011                         print_ip((ipfw_insn_ip *)cmd,
1012                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1013                         flags |= HAVE_DSTIP;
1014                         break;
1015
1016                 case O_IP_DSTPORT:
1017                         show_prerequisites(&flags, HAVE_IP, 0);
1018                 case O_IP_SRCPORT:
1019                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1020                         if ((cmd->len & F_OR) && !or_block)
1021                                 printf(" {");
1022                         print_newports((ipfw_insn_u16 *)cmd, proto,
1023                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1024                         break;
1025
1026                 case O_PROTO: {
1027                         struct protoent *pe;
1028
1029                         if ((cmd->len & F_OR) && !or_block)
1030                                 printf(" {");
1031                         if (cmd->len & F_NOT)
1032                                 printf(" not");
1033                         proto = cmd->arg1;
1034                         pe = getprotobynumber(cmd->arg1);
1035                         if (flags & HAVE_OPTIONS)
1036                                 printf(" proto");
1037                         if (pe)
1038                                 printf(" %s", pe->p_name);
1039                         else
1040                                 printf(" %u", cmd->arg1);
1041                         }
1042                         flags |= HAVE_PROTO;
1043                         break;
1044
1045                 default: /*options ... */
1046                         show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1047                         if ((cmd->len & F_OR) && !or_block)
1048                                 printf(" {");
1049                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1050                                 printf(" not");
1051                         switch(cmd->opcode) {
1052                         case O_FRAG:
1053                                 printf(" frag");
1054                                 break;
1055
1056                         case O_IN:
1057                                 printf(cmd->len & F_NOT ? " out" : " in");
1058                                 break;
1059
1060                         case O_LAYER2:
1061                                 printf(" layer2");
1062                                 break;
1063                         case O_XMIT:
1064                         case O_RECV:
1065                         case O_VIA: {
1066                                 char *s;
1067                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1068
1069                                 if (cmd->opcode == O_XMIT)
1070                                         s = "xmit";
1071                                 else if (cmd->opcode == O_RECV)
1072                                         s = "recv";
1073                                 else if (cmd->opcode == O_VIA)
1074                                         s = "via";
1075                                 else
1076                                         s = "?huh?";
1077                                 if (cmdif->name[0] == '\0')
1078                                         printf(" %s %s", s,
1079                                             inet_ntoa(cmdif->p.ip));
1080                                 printf(" %s %s", s, cmdif->name);
1081                                 }
1082                                 break;
1083
1084                         case O_IPID:
1085                                 printf(" ipid %u", cmd->arg1 );
1086                                 break;
1087
1088                         case O_IPTTL:
1089                                 printf(" ipttl %u", cmd->arg1 );
1090                                 break;
1091
1092                         case O_IPVER:
1093                                 printf(" ipver %u", cmd->arg1 );
1094                                 break;
1095
1096                         case O_IPPRECEDENCE:
1097                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1098                                 break;
1099
1100                         case O_IPLEN:
1101                                 printf(" iplen %u", cmd->arg1 );
1102                                 break;
1103
1104                         case O_IPOPT:
1105                                 print_flags("ipoptions", cmd, f_ipopts);
1106                                 break;
1107
1108                         case O_IPTOS:
1109                                 print_flags("iptos", cmd, f_iptos);
1110                                 break;
1111
1112                         case O_ICMPTYPE:
1113                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1114                                 break;
1115
1116                         case O_ESTAB:
1117                                 printf(" established");
1118                                 break;
1119
1120                         case O_TCPFLAGS:
1121                                 print_flags("tcpflags", cmd, f_tcpflags);
1122                                 break;
1123
1124                         case O_TCPOPTS:
1125                                 print_flags("tcpoptions", cmd, f_tcpopts);
1126                                 break;
1127
1128                         case O_TCPWIN:
1129                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1130                                 break;
1131
1132                         case O_TCPACK:
1133                                 printf(" tcpack %ld", ntohl(cmd32->d[0]));
1134                                 break;
1135
1136                         case O_TCPSEQ:
1137                                 printf(" tcpseq %ld", ntohl(cmd32->d[0]));
1138                                 break;
1139
1140                         case O_UID:
1141                             {
1142                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1143
1144                                 if (pwd)
1145                                         printf(" uid %s", pwd->pw_name);
1146                                 else
1147                                         printf(" uid %u", cmd32->d[0]);
1148                             }
1149                                 break;
1150
1151                         case O_GID:
1152                             {
1153                                 struct group *grp = getgrgid(cmd32->d[0]);
1154
1155                                 if (grp)
1156                                         printf(" gid %s", grp->gr_name);
1157                                 else
1158                                         printf(" gid %u", cmd32->d[0]);
1159                             }
1160                                 break;
1161
1162                         case O_KEEP_STATE:
1163                                 printf(" keep-state");
1164                                 break;
1165
1166                         case O_LIMIT:
1167                             {
1168                                 struct _s_x *p = limit_masks;
1169                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1170                                 u_int8_t x = c->limit_mask;
1171                                 char *comma = " ";
1172
1173                                 printf(" limit");
1174                                 for ( ; p->x != 0 ; p++)
1175                                         if ((x & p->x) == p->x) {
1176                                                 x &= ~p->x;
1177                                                 printf("%s%s", comma, p->s);
1178                                                 comma = ",";
1179                                         }
1180                                 printf(" %d", c->conn_limit);
1181                             }
1182                                 break;
1183
1184                         default:
1185                                 printf(" [opcode %d len %d]",
1186                                     cmd->opcode, cmd->len);
1187                         }
1188                 }
1189                 if (cmd->len & F_OR) {
1190                         printf(" or");
1191                         or_block = 1;
1192                 } else if (or_block) {
1193                         printf(" }");
1194                         or_block = 0;
1195                 }
1196         }
1197         show_prerequisites(&flags, HAVE_IP, 0);
1198
1199         printf("\n");
1200 }
1201
1202 static void
1203 show_dyn_ipfw(struct ipfw_ioc_state *d, int pcwidth, int bcwidth)
1204 {
1205         struct protoent *pe;
1206         struct in_addr a;
1207
1208         if (!do_expired) {
1209                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1210                         return;
1211         }
1212
1213         printf("%05u %*llu %*llu (%ds)", d->rulenum, pcwidth, d->pcnt,
1214             bcwidth, d->bcnt, d->expire);
1215         switch (d->dyn_type) {
1216         case O_LIMIT_PARENT:
1217                 printf(" PARENT %d", d->count);
1218                 break;
1219         case O_LIMIT:
1220                 printf(" LIMIT");
1221                 break;
1222         case O_KEEP_STATE: /* bidir, no mask */
1223                 printf(" STATE");
1224                 break;
1225         }
1226
1227         if ((pe = getprotobynumber(d->id.u.ip.proto)) != NULL)
1228                 printf(" %s", pe->p_name);
1229         else
1230                 printf(" proto %u", d->id.u.ip.proto);
1231
1232         a.s_addr = htonl(d->id.u.ip.src_ip);
1233         printf(" %s %d", inet_ntoa(a), d->id.u.ip.src_port);
1234
1235         a.s_addr = htonl(d->id.u.ip.dst_ip);
1236         printf(" <-> %s %d", inet_ntoa(a), d->id.u.ip.dst_port);
1237         printf("\n");
1238 }
1239
1240 int
1241 sort_q(const void *pa, const void *pb)
1242 {
1243         int rev = (do_sort < 0);
1244         int field = rev ? -do_sort : do_sort;
1245         long long res = 0;
1246         const struct dn_ioc_flowqueue *a = pa;
1247         const struct dn_ioc_flowqueue *b = pb;
1248
1249         switch (field) {
1250         case 1: /* pkts */
1251                 res = a->len - b->len;
1252                 break;
1253         case 2: /* bytes */
1254                 res = a->len_bytes - b->len_bytes;
1255                 break;
1256
1257         case 3: /* tot pkts */
1258                 res = a->tot_pkts - b->tot_pkts;
1259                 break;
1260
1261         case 4: /* tot bytes */
1262                 res = a->tot_bytes - b->tot_bytes;
1263                 break;
1264         }
1265         if (res < 0)
1266                 res = -1;
1267         if (res > 0)
1268                 res = 1;
1269         return (int)(rev ? res : -res);
1270 }
1271
1272 static void
1273 list_queues(struct dn_ioc_flowset *fs, struct dn_ioc_flowqueue *q)
1274 {
1275         int l;
1276
1277         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1278             fs->flow_mask.u.ip.proto,
1279             fs->flow_mask.u.ip.src_ip, fs->flow_mask.u.ip.src_port,
1280             fs->flow_mask.u.ip.dst_ip, fs->flow_mask.u.ip.dst_port);
1281         if (fs->rq_elements == 0)
1282                 return;
1283
1284         printf("BKT Prot ___Source IP/port____ "
1285             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1286         if (do_sort != 0)
1287                 heapsort(q, fs->rq_elements, sizeof(*q), sort_q);
1288         for (l = 0; l < fs->rq_elements; l++) {
1289                 struct in_addr ina;
1290                 struct protoent *pe;
1291
1292                 ina.s_addr = htonl(q[l].id.u.ip.src_ip);
1293                 printf("%3d ", q[l].hash_slot);
1294                 pe = getprotobynumber(q[l].id.u.ip.proto);
1295                 if (pe)
1296                         printf("%-4s ", pe->p_name);
1297                 else
1298                         printf("%4u ", q[l].id.u.ip.proto);
1299                 printf("%15s/%-5d ",
1300                     inet_ntoa(ina), q[l].id.u.ip.src_port);
1301                 ina.s_addr = htonl(q[l].id.u.ip.dst_ip);
1302                 printf("%15s/%-5d ",
1303                     inet_ntoa(ina), q[l].id.u.ip.dst_port);
1304                 printf("%4qu %8qu %2u %4u %3u\n",
1305                     q[l].tot_pkts, q[l].tot_bytes,
1306                     q[l].len, q[l].len_bytes, q[l].drops);
1307                 if (verbose)
1308                         printf("   S %20qd  F %20qd\n",
1309                             q[l].S, q[l].F);
1310         }
1311 }
1312
1313 static void
1314 print_flowset_parms(struct dn_ioc_flowset *fs, char *prefix)
1315 {
1316         int l;
1317         char qs[30];
1318         char plr[30];
1319         char red[90];   /* Display RED parameters */
1320
1321         l = fs->qsize;
1322         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1323                 if (l >= 8192)
1324                         sprintf(qs, "%d KB", l / 1024);
1325                 else
1326                         sprintf(qs, "%d B", l);
1327         } else
1328                 sprintf(qs, "%3d sl.", l);
1329         if (fs->plr)
1330                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1331         else
1332                 plr[0] = '\0';
1333         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1334                 sprintf(red,
1335                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1336                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1337                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1338                     SCALE_VAL(fs->min_th),
1339                     SCALE_VAL(fs->max_th),
1340                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1341         else
1342                 sprintf(red, "droptail");
1343
1344         printf("%s %s%s %d queues (%d buckets) %s\n",
1345             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1346 }
1347
1348 static void
1349 list_pipes(void *data, int nbytes, int ac, char *av[])
1350 {
1351         u_long rulenum;
1352         void *next = data;
1353         struct dn_ioc_pipe *p = (struct dn_ioc_pipe *)data;
1354         struct dn_ioc_flowset *fs;
1355         struct dn_ioc_flowqueue *q;
1356         int l;
1357
1358         if (ac > 0)
1359                 rulenum = strtoul(*av++, NULL, 10);
1360         else
1361                 rulenum = 0;
1362         for (; nbytes >= sizeof(*p); p = (struct dn_ioc_pipe *)next) {
1363                 double b = p->bandwidth;
1364                 char buf[30];
1365                 char prefix[80];
1366
1367                 if (p->fs.fs_type != DN_IS_PIPE)
1368                         break;  /* done with pipes, now queues */
1369
1370                 /*
1371                  * compute length, as pipe have variable size
1372                  */
1373                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1374                 next = (void *)p + l;
1375                 nbytes -= l;
1376
1377                 if (rulenum != 0 && rulenum != p->pipe_nr)
1378                         continue;
1379
1380                 /*
1381                  * Print rate
1382                  */
1383                 if (b == 0)
1384                         sprintf(buf, "unlimited");
1385                 else if (b >= 1000000)
1386                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1387                 else if (b >= 1000)
1388                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1389                 else
1390                         sprintf(buf, "%7.3f bit/s ", b);
1391
1392                 sprintf(prefix, "%05d: %s %4d ms ",
1393                     p->pipe_nr, buf, p->delay);
1394                 print_flowset_parms(&p->fs, prefix);
1395                 if (verbose)
1396                         printf("   V %20qd\n", p->V >> MY_M);
1397
1398                 q = (struct dn_ioc_flowqueue *)(p+1);
1399                 list_queues(&p->fs, q);
1400         }
1401         for (fs = next; nbytes >= sizeof(*fs); fs = next) {
1402                 char prefix[80];
1403
1404                 if (fs->fs_type != DN_IS_QUEUE)
1405                         break;
1406                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1407                 next = (void *)fs + l;
1408                 nbytes -= l;
1409                 q = (struct dn_ioc_flowqueue *)(fs+1);
1410                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1411                     fs->fs_nr, fs->weight, fs->parent_nr);
1412                 print_flowset_parms(fs, prefix);
1413                 list_queues(fs, q);
1414         }
1415 }
1416
1417 /*
1418  * This one handles all set-related commands
1419  *      ipfw set { show | enable | disable }
1420  *      ipfw set swap X Y
1421  *      ipfw set move X to Y
1422  *      ipfw set move rule X to Y
1423  */
1424 static void
1425 sets_handler(int ac, char *av[])
1426 {
1427         u_int32_t set_disable, masks[2];
1428         int i, nbytes;
1429         u_int16_t rulenum;
1430         u_int8_t cmd, new_set;
1431
1432         ac--;
1433         av++;
1434
1435         if (!ac)
1436                 errx(EX_USAGE, "set needs command");
1437         if (!strncmp(*av, "show", strlen(*av)) ) {
1438                 void *data;
1439                 char *msg;
1440
1441                 nbytes = sizeof(struct ipfw_ioc_rule);
1442                 if ((data = malloc(nbytes)) == NULL)
1443                         err(EX_OSERR, "malloc");
1444                 if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
1445                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1446                 set_disable = ((struct ipfw_ioc_rule *)data)->set_disable;
1447
1448                 for (i = 0, msg = "disable" ; i < 31; i++)
1449                         if (  (set_disable & (1<<i))) {
1450                                 printf("%s %d", msg, i);
1451                                 msg = "";
1452                         }
1453                 msg = (set_disable) ? " enable" : "enable";
1454                 for (i = 0; i < 31; i++)
1455                         if ( !(set_disable & (1<<i))) {
1456                                 printf("%s %d", msg, i);
1457                                 msg = "";
1458                         }
1459                 printf("\n");
1460         } else if (!strncmp(*av, "swap", strlen(*av))) {
1461                 ac--; av++;
1462                 if (ac != 2)
1463                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1464                 rulenum = atoi(av[0]);
1465                 new_set = atoi(av[1]);
1466                 if (!isdigit(*(av[0])) || rulenum > 30)
1467                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1468                 if (!isdigit(*(av[1])) || new_set > 30)
1469                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1470                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1471                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1472                         masks, sizeof(u_int32_t));
1473         } else if (!strncmp(*av, "move", strlen(*av))) {
1474                 ac--; av++;
1475                 if (ac && !strncmp(*av, "rule", strlen(*av))) {
1476                         cmd = 2;
1477                         ac--; av++;
1478                 } else
1479                         cmd = 3;
1480                 if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
1481                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1482                 rulenum = atoi(av[0]);
1483                 new_set = atoi(av[2]);
1484                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
1485                         (cmd == 2 && rulenum == 65535) )
1486                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1487                 if (!isdigit(*(av[2])) || new_set > 30)
1488                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1489                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1490                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1491                         masks, sizeof(u_int32_t));
1492         } else if (!strncmp(*av, "disable", strlen(*av)) ||
1493                    !strncmp(*av, "enable",  strlen(*av)) ) {
1494                 int which = !strncmp(*av, "enable",  strlen(*av)) ? 1 : 0;
1495
1496                 ac--; av++;
1497                 masks[0] = masks[1] = 0;
1498
1499                 while (ac) {
1500                         if (isdigit(**av)) {
1501                                 i = atoi(*av);
1502                                 if (i < 0 || i > 30)
1503                                         errx(EX_DATAERR,
1504                                             "invalid set number %d\n", i);
1505                                 masks[which] |= (1<<i);
1506                         } else if (!strncmp(*av, "disable", strlen(*av)))
1507                                 which = 0;
1508                         else if (!strncmp(*av, "enable", strlen(*av)))
1509                                 which = 1;
1510                         else
1511                                 errx(EX_DATAERR,
1512                                         "invalid set command %s\n", *av);
1513                         av++; ac--;
1514                 }
1515                 if ( (masks[0] & masks[1]) != 0 )
1516                         errx(EX_DATAERR,
1517                             "cannot enable and disable the same set\n");
1518
1519                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
1520                 if (i)
1521                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1522         } else
1523                 errx(EX_USAGE, "invalid set command %s\n", *av);
1524 }
1525
1526 static void
1527 sysctl_handler(int ac, char *av[], int which)
1528 {
1529         ac--;
1530         av++;
1531
1532         if (*av == NULL) {
1533                 warnx("missing keyword to enable/disable\n");
1534         } else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
1535                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1536                     &which, sizeof(which));
1537         } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
1538                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1539                     &which, sizeof(which));
1540         } else if (strncmp(*av, "debug", strlen(*av)) == 0) {
1541                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1542                     &which, sizeof(which));
1543         } else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
1544                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1545                     &which, sizeof(which));
1546         } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
1547                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1548                     &which, sizeof(which));
1549         } else {
1550                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1551         }
1552 }
1553
1554 static void
1555 list(int ac, char *av[])
1556 {
1557         struct ipfw_ioc_rule *r;
1558         struct ipfw_ioc_state *dynrules, *d;
1559
1560         void *data = NULL;
1561         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1562         int exitval = EX_OK;
1563         int lac;
1564         char **lav;
1565         u_long rnum;
1566         char *endptr;
1567         int seen = 0;
1568
1569         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1570         int nalloc = 1024;      /* start somewhere... */
1571
1572         ac--;
1573         av++;
1574
1575         /* get rules or pipes from kernel, resizing array as necessary */
1576         nbytes = nalloc;
1577
1578         while (nbytes >= nalloc) {
1579                 nalloc = nalloc * 2 + 200;
1580                 nbytes = nalloc;
1581                 if ((data = realloc(data, nbytes)) == NULL)
1582                         err(EX_OSERR, "realloc");
1583                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1584                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1585                                 do_pipe ? "DUMMYNET" : "FW");
1586         }
1587
1588         if (do_pipe) {
1589                 list_pipes(data, nbytes, ac, av);
1590                 goto done;
1591         }
1592
1593         /*
1594          * Count static rules.
1595          */
1596         r = data;
1597         nstat = r->static_count;
1598
1599         /*
1600          * Count dynamic rules. This is easier as they have
1601          * fixed size.
1602          */
1603         dynrules = (struct ipfw_ioc_state *)((void *)r + r->static_len);
1604         ndyn = (nbytes - r->static_len) / sizeof(*dynrules);
1605
1606         /* if showing stats, figure out column widths ahead of time */
1607         bcwidth = pcwidth = 0;
1608         if (do_acct) {
1609                 for (n = 0, r = data; n < nstat;
1610                     n++, r = (void *)r + IOC_RULESIZE(r)) {
1611                         /* packet counter */
1612                         width = snprintf(NULL, 0, "%llu", r->pcnt);
1613                         if (width > pcwidth)
1614                                 pcwidth = width;
1615
1616                         /* byte counter */
1617                         width = snprintf(NULL, 0, "%llu", r->bcnt);
1618                         if (width > bcwidth)
1619                                 bcwidth = width;
1620                 }
1621         }
1622         if (do_dynamic && ndyn) {
1623                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1624                         width = snprintf(NULL, 0, "%llu", d->pcnt);
1625                         if (width > pcwidth)
1626                                 pcwidth = width;
1627
1628                         width = snprintf(NULL, 0, "%llu", d->bcnt);
1629                         if (width > bcwidth)
1630                                 bcwidth = width;
1631                 }
1632         }
1633         /* if no rule numbers were specified, list all rules */
1634         if (ac == 0) {
1635                 for (n = 0, r = data; n < nstat;
1636                     n++, r = (void *)r + IOC_RULESIZE(r) )
1637                         show_ipfw(r, pcwidth, bcwidth);
1638
1639                 if (do_dynamic && ndyn) {
1640                         printf("## Dynamic rules (%d):\n", ndyn);
1641                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1642                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1643                 }
1644                 goto done;
1645         }
1646
1647         /* display specific rules requested on command line */
1648
1649         for (lac = ac, lav = av; lac != 0; lac--) {
1650                 /* convert command line rule # */
1651                 rnum = strtoul(*lav++, &endptr, 10);
1652                 if (*endptr) {
1653                         exitval = EX_USAGE;
1654                         warnx("invalid rule number: %s", *(lav - 1));
1655                         continue;
1656                 }
1657                 for (n = seen = 0, r = data; n < nstat;
1658                     n++, r = (void *)r + IOC_RULESIZE(r) ) {
1659                         if (r->rulenum > rnum)
1660                                 break;
1661                         if (r->rulenum == rnum) {
1662                                 show_ipfw(r, pcwidth, bcwidth);
1663                                 seen = 1;
1664                         }
1665                 }
1666                 if (!seen) {
1667                         /* give precedence to other error(s) */
1668                         if (exitval == EX_OK)
1669                                 exitval = EX_UNAVAILABLE;
1670                         warnx("rule %lu does not exist", rnum);
1671                 }
1672         }
1673
1674         if (do_dynamic && ndyn) {
1675                 printf("## Dynamic rules:\n");
1676                 for (lac = ac, lav = av; lac != 0; lac--) {
1677                         rnum = strtoul(*lav++, &endptr, 10);
1678                         if (*endptr)
1679                                 /* already warned */
1680                                 continue;
1681                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1682                                 if (d->rulenum > rnum)
1683                                         break;
1684                                 if (d->rulenum == rnum)
1685                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1686                         }
1687                 }
1688         }
1689
1690         ac = 0;
1691
1692 done:
1693         free(data);
1694
1695         if (exitval != EX_OK)
1696                 exit(exitval);
1697 }
1698
1699 static void
1700 show_usage(void)
1701 {
1702         fprintf(stderr, "usage: ipfw [options]\n"
1703 "    add [number] rule\n"
1704 "    pipe number config [pipeconfig]\n"
1705 "    queue number config [queueconfig]\n"
1706 "    [pipe] flush\n"
1707 "    [pipe] delete number ...\n"
1708 "    [pipe] {list|show} [number ...]\n"
1709 "    {zero|resetlog} [number ...]\n"
1710 "do \"ipfw -h\" or see ipfw manpage for details\n"
1711 );
1712
1713         exit(EX_USAGE);
1714 }
1715
1716 static void
1717 help(void)
1718 {
1719
1720         fprintf(stderr, "ipfw syntax summary:\n"
1721 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1722 "ipfw {pipe|queue} N config BODY\n"
1723 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1724 "\n"
1725 "RULE:          [1..] [PROB] BODY\n"
1726 "RULENUM:       INTEGER(1..65534)\n"
1727 "PROB:          prob REAL(0..1)\n"
1728 "BODY:          check-state [LOG] (no body) |\n"
1729 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1730 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1731 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1732 "ADDR:          [ MAC dst src ether_type ] \n"
1733 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1734 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1735 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1736 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1737 );
1738 exit(0);
1739 }
1740
1741
1742 static int
1743 lookup_host (char *host, struct in_addr *ipaddr)
1744 {
1745         struct hostent *he;
1746
1747         if (!inet_aton(host, ipaddr)) {
1748                 if ((he = gethostbyname(host)) == NULL)
1749                         return(-1);
1750                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1751         }
1752         return(0);
1753 }
1754
1755 /*
1756  * fills the addr and mask fields in the instruction as appropriate from av.
1757  * Update length as appropriate.
1758  * The following formats are allowed:
1759  *      any     matches any IP. Actually returns an empty instruction.
1760  *      me      returns O_IP_*_ME
1761  *      1.2.3.4         single IP address
1762  *      1.2.3.4:5.6.7.8 address:mask
1763  *      1.2.3.4/24      address/mask
1764  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1765  */
1766 static void
1767 fill_ip(ipfw_insn_ip *cmd, char *av)
1768 {
1769         char *p = NULL, md = 0;
1770         u_int32_t i;
1771
1772         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1773
1774         if (!strncmp(av, "any", strlen(av)))
1775                 return;
1776
1777         if (!strncmp(av, "me", strlen(av))) {
1778                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1779                 return;
1780         }
1781
1782         p = strchr(av, '/');
1783         if (!p)
1784                 p = strchr(av, ':');
1785         if (p) {
1786                 md = *p;
1787                 *p++ = '\0';
1788         }
1789
1790         if (lookup_host(av, &cmd->addr) != 0)
1791                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1792         switch (md) {
1793         case ':':
1794                 if (!inet_aton(p, &cmd->mask))
1795                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1796                 break;
1797         case '/':
1798                 i = atoi(p);
1799                 if (i == 0)
1800                         cmd->mask.s_addr = htonl(0);
1801                 else if (i > 32)
1802                         errx(EX_DATAERR, "bad width ``%s''", p);
1803                 else
1804                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1805                 break;
1806         default:
1807                 cmd->mask.s_addr = htonl(~0);
1808                 break;
1809         }
1810         cmd->addr.s_addr &= cmd->mask.s_addr;
1811         /*
1812          * now look if we have a set of addresses. They are stored as follows:
1813          *   arg1       is the set size (powers of 2, 2..256)
1814          *   addr       is the base address IN HOST FORMAT
1815          *   mask..     is an array of u_int32_t with bits set.
1816          */
1817         if (p)
1818                 p = strchr(p, '{');
1819         if (p) {        /* fetch addresses */
1820                 u_int32_t *d;
1821                 int low, high;
1822                 int i = contigmask((u_char *)&(cmd->mask), 32);
1823
1824                 if (i < 24 || i > 31) {
1825                         fprintf(stderr, "invalid set with mask %d\n",
1826                                 i);
1827                         exit(0);
1828                 }
1829                 cmd->o.arg1 = 1<<(32-i);
1830                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1831                 d = (u_int32_t *)&cmd->mask;
1832                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1833                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1834                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
1835                         d[i] = 0;       /* clear masks */
1836
1837                 av = p+1;
1838                 low = cmd->addr.s_addr & 0xff;
1839                 high = low + cmd->o.arg1 - 1;
1840                 while (isdigit(*av)) {
1841                         char *s;
1842                         u_int16_t a = strtol(av, &s, 0);
1843
1844                         if (s == av) /* no parameter */
1845                                 break;
1846                         if (a < low || a > high) {
1847                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1848                                 a, low, high);
1849                             exit(0);
1850                         }
1851                         a -= low;
1852                         d[ a/32] |= 1<<(a & 31);
1853                         if (*s != ',')
1854                                 break;
1855                         av = s+1;
1856                 }
1857                 return;
1858         }
1859
1860         if (cmd->mask.s_addr == 0) { /* any */
1861                 if (cmd->o.len & F_NOT)
1862                         errx(EX_DATAERR, "not any never matches");
1863                 else    /* useless, nuke it */
1864                         return;
1865         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1866                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1867         else                                            /* addr/mask */
1868                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1869 }
1870
1871
1872 /*
1873  * helper function to process a set of flags and set bits in the
1874  * appropriate masks.
1875  */
1876 static void
1877 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1878         struct _s_x *flags, char *p)
1879 {
1880         u_int8_t set=0, clear=0;
1881
1882         while (p && *p) {
1883                 char *q;        /* points to the separator */
1884                 int val;
1885                 u_int8_t *which;        /* mask we are working on */
1886
1887                 if (*p == '!') {
1888                         p++;
1889                         which = &clear;
1890                 } else
1891                         which = &set;
1892                 q = strchr(p, ',');
1893                 if (q)
1894                         *q++ = '\0';
1895                 val = match_token(flags, p);
1896                 if (val <= 0)
1897                         errx(EX_DATAERR, "invalid flag %s", p);
1898                 *which |= (u_int8_t)val;
1899                 p = q;
1900         }
1901         cmd->opcode = opcode;
1902         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1903         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1904 }
1905
1906
1907 static void
1908 delete(int ac, char *av[])
1909 {
1910         u_int32_t rulenum;
1911         struct dn_ioc_pipe pipe;
1912         int i;
1913         int exitval = EX_OK;
1914         int do_set = 0;
1915
1916         memset(&pipe, 0, sizeof pipe);
1917
1918         av++; ac--;
1919         if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
1920                 do_set = 1;     /* delete set */
1921                 ac--; av++;
1922         }
1923
1924         /* Rule number */
1925         while (ac && isdigit(**av)) {
1926                 i = atoi(*av); av++; ac--;
1927                 if (do_pipe) {
1928                         if (do_pipe == 1)
1929                                 pipe.pipe_nr = i;
1930                         else
1931                                 pipe.fs.fs_nr = i;
1932                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1933                             &pipe, sizeof pipe);
1934                         if (i) {
1935                                 exitval = 1;
1936                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1937                                     do_pipe == 1 ? pipe.pipe_nr :
1938                                     pipe.fs.fs_nr);
1939                         }
1940                 } else {
1941                         rulenum =  (i & 0xffff) | (do_set << 24);
1942                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1943                             sizeof rulenum);
1944                         if (i) {
1945                                 exitval = EX_UNAVAILABLE;
1946                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1947                                     rulenum);
1948                         }
1949                 }
1950         }
1951         if (exitval != EX_OK)
1952                 exit(exitval);
1953 }
1954
1955
1956 /*
1957  * fill the interface structure. We do not check the name as we can
1958  * create interfaces dynamically, so checking them at insert time
1959  * makes relatively little sense.
1960  * Interface names containing '*', '?', or '[' are assumed to be shell
1961  * patterns which match interfaces.
1962  */
1963 static void
1964 fill_iface(ipfw_insn_if *cmd, char *arg)
1965 {
1966         cmd->name[0] = '\0';
1967         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1968
1969         /* Parse the interface or address */
1970         if (!strcmp(arg, "any"))
1971                 cmd->o.len = 0;         /* effectively ignore this command */
1972         else if (!isdigit(*arg)) {
1973                 strlcpy(cmd->name, arg, sizeof(cmd->name));
1974                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
1975         } else if (!inet_aton(arg, &cmd->p.ip))
1976                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1977 }
1978
1979 static unsigned long
1980 getbw(const char *str, u_short *flags, int kb)
1981 {
1982     char *end;
1983     unsigned long val;
1984     int inbytes = 0;
1985
1986     val = strtoul(str, &end, 0);
1987     if (*end == 'k' || *end == 'K') {
1988         ++end;
1989         val *= kb;
1990     } else if (*end == 'm' || *end == 'M') {
1991         ++end;
1992         val *= kb * kb;
1993     }
1994
1995     /*
1996      * Deal with bits or bytes or b(bits) or B(bytes).  If there is no
1997      * trailer assume bits.
1998      */
1999     if (strncasecmp(end, "bit", 3) == 0) {
2000         ;
2001     } else if (strncasecmp(end, "byte", 4) == 0) {
2002         inbytes = 1;
2003     } else if (*end == 'b') {
2004         ;
2005     } else if (*end == 'B') {
2006         inbytes = 1;
2007     }
2008
2009     /*
2010      * Return in bits if flags is NULL, else flag bits
2011      * or bytes in flags and return the unconverted value.
2012      */
2013     if (inbytes && flags)
2014         *flags |= DN_QSIZE_IS_BYTES;
2015     else if (inbytes && flags == NULL)
2016         val *= 8;
2017     return(val);
2018 }
2019
2020 /*
2021  * the following macro returns an error message if we run out of
2022  * arguments.
2023  */
2024 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
2025
2026 static void
2027 config_pipe(int ac, char **av)
2028 {
2029         struct dn_ioc_pipe pipe;
2030         int i;
2031         char *end;
2032         u_int32_t a;
2033         void *par = NULL;
2034
2035         memset(&pipe, 0, sizeof pipe);
2036
2037         av++; ac--;
2038         /* Pipe number */
2039         if (ac && isdigit(**av)) {
2040                 i = atoi(*av); av++; ac--;
2041                 if (do_pipe == 1)
2042                         pipe.pipe_nr = i;
2043                 else
2044                         pipe.fs.fs_nr = i;
2045         }
2046         while (ac > 0) {
2047                 double d;
2048                 int tok = match_token(dummynet_params, *av);
2049                 ac--; av++;
2050
2051                 switch(tok) {
2052                 case TOK_NOERROR:
2053                         pipe.fs.flags_fs |= DN_NOERROR;
2054                         break;
2055
2056                 case TOK_PLR:
2057                         NEED1("plr needs argument 0..1\n");
2058                         d = strtod(av[0], NULL);
2059                         if (d > 1)
2060                                 d = 1;
2061                         else if (d < 0)
2062                                 d = 0;
2063                         pipe.fs.plr = (int)(d*0x7fffffff);
2064                         ac--; av++;
2065                         break;
2066
2067                 case TOK_QUEUE:
2068                         NEED1("queue needs queue size\n");
2069                         end = NULL;
2070                         pipe.fs.qsize = getbw(av[0], &pipe.fs.flags_fs, 1024);
2071                         ac--; av++;
2072                         break;
2073
2074                 case TOK_BUCKETS:
2075                         NEED1("buckets needs argument\n");
2076                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
2077                         ac--; av++;
2078                         break;
2079
2080                 case TOK_MASK:
2081                         NEED1("mask needs mask specifier\n");
2082                         /*
2083                          * per-flow queue, mask is dst_ip, dst_port,
2084                          * src_ip, src_port, proto measured in bits
2085                          */
2086                         par = NULL;
2087
2088                         pipe.fs.flow_mask.type = ETHERTYPE_IP;
2089                         pipe.fs.flow_mask.u.ip.dst_ip = 0;
2090                         pipe.fs.flow_mask.u.ip.src_ip = 0;
2091                         pipe.fs.flow_mask.u.ip.dst_port = 0;
2092                         pipe.fs.flow_mask.u.ip.src_port = 0;
2093                         pipe.fs.flow_mask.u.ip.proto = 0;
2094                         end = NULL;
2095
2096                         while (ac >= 1) {
2097                             u_int32_t *p32 = NULL;
2098                             u_int16_t *p16 = NULL;
2099
2100                             tok = match_token(dummynet_params, *av);
2101                             ac--; av++;
2102                             switch(tok) {
2103                             case TOK_ALL:
2104                                     /*
2105                                      * special case, all bits significant
2106                                      */
2107                                     pipe.fs.flow_mask.u.ip.dst_ip = ~0;
2108                                     pipe.fs.flow_mask.u.ip.src_ip = ~0;
2109                                     pipe.fs.flow_mask.u.ip.dst_port = ~0;
2110                                     pipe.fs.flow_mask.u.ip.src_port = ~0;
2111                                     pipe.fs.flow_mask.u.ip.proto = ~0;
2112                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2113                                     goto end_mask;
2114
2115                             case TOK_DSTIP:
2116                                     p32 = &pipe.fs.flow_mask.u.ip.dst_ip;
2117                                     break;
2118
2119                             case TOK_SRCIP:
2120                                     p32 = &pipe.fs.flow_mask.u.ip.src_ip;
2121                                     break;
2122
2123                             case TOK_DSTPORT:
2124                                     p16 = &pipe.fs.flow_mask.u.ip.dst_port;
2125                                     break;
2126
2127                             case TOK_SRCPORT:
2128                                     p16 = &pipe.fs.flow_mask.u.ip.src_port;
2129                                     break;
2130
2131                             case TOK_PROTO:
2132                                     break;
2133
2134                             default:
2135                                     ac++; av--; /* backtrack */
2136                                     goto end_mask;
2137                             }
2138                             if (ac < 1)
2139                                     errx(EX_USAGE, "mask: value missing");
2140                             if (*av[0] == '/') {
2141                                     a = strtoul(av[0]+1, &end, 0);
2142                                     a = (a == 32) ? ~0 : (1 << a) - 1;
2143                             } else
2144                                     a = strtoul(av[0], &end, 0);
2145                             if (p32 != NULL)
2146                                     *p32 = a;
2147                             else if (p16 != NULL) {
2148                                     if (a > 65535)
2149                                             errx(EX_DATAERR,
2150                                                 "mask: must be 16 bit");
2151                                     *p16 = (u_int16_t)a;
2152                             } else {
2153                                     if (a > 255)
2154                                             errx(EX_DATAERR,
2155                                                 "mask: must be 8 bit");
2156                                     pipe.fs.flow_mask.u.ip.proto = (uint8_t)a;
2157                             }
2158                             if (a != 0)
2159                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2160                             ac--; av++;
2161                         } /* end while, config masks */
2162 end_mask:
2163                         break;
2164
2165                 case TOK_RED:
2166                 case TOK_GRED:
2167                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
2168                         pipe.fs.flags_fs |= DN_IS_RED;
2169                         if (tok == TOK_GRED)
2170                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
2171                         /*
2172                          * the format for parameters is w_q/min_th/max_th/max_p
2173                          */
2174                         if ((end = strsep(&av[0], "/"))) {
2175                             double w_q = strtod(end, NULL);
2176                             if (w_q > 1 || w_q <= 0)
2177                                 errx(EX_DATAERR, "0 < w_q <= 1");
2178                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
2179                         }
2180                         if ((end = strsep(&av[0], "/"))) {
2181                             pipe.fs.min_th = strtoul(end, &end, 0);
2182                             if (*end == 'K' || *end == 'k')
2183                                 pipe.fs.min_th *= 1024;
2184                         }
2185                         if ((end = strsep(&av[0], "/"))) {
2186                             pipe.fs.max_th = strtoul(end, &end, 0);
2187                             if (*end == 'K' || *end == 'k')
2188                                 pipe.fs.max_th *= 1024;
2189                         }
2190                         if ((end = strsep(&av[0], "/"))) {
2191                             double max_p = strtod(end, NULL);
2192                             if (max_p > 1 || max_p <= 0)
2193                                 errx(EX_DATAERR, "0 < max_p <= 1");
2194                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
2195                         }
2196                         ac--; av++;
2197                         break;
2198
2199                 case TOK_DROPTAIL:
2200                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
2201                         break;
2202
2203                 case TOK_BW:
2204                         NEED1("bw needs bandwidth\n");
2205                         if (do_pipe != 1)
2206                             errx(EX_DATAERR, "bandwidth only valid for pipes");
2207                         /*
2208                          * set bandwidth value
2209                          */
2210                         pipe.bandwidth = getbw(av[0], NULL, 1000);
2211                         if (pipe.bandwidth < 0)
2212                             errx(EX_DATAERR, "bandwidth too large");
2213                         ac--; av++;
2214                         break;
2215
2216                 case TOK_DELAY:
2217                         if (do_pipe != 1)
2218                                 errx(EX_DATAERR, "delay only valid for pipes");
2219                         NEED1("delay needs argument 0..10000ms\n");
2220                         pipe.delay = strtoul(av[0], NULL, 0);
2221                         ac--; av++;
2222                         break;
2223
2224                 case TOK_WEIGHT:
2225                         if (do_pipe == 1)
2226                                 errx(EX_DATAERR,"weight only valid for queues");
2227                         NEED1("weight needs argument 0..100\n");
2228                         pipe.fs.weight = strtoul(av[0], &end, 0);
2229                         ac--; av++;
2230                         break;
2231
2232                 case TOK_PIPE:
2233                         if (do_pipe == 1)
2234                                 errx(EX_DATAERR,"pipe only valid for queues");
2235                         NEED1("pipe needs pipe_number\n");
2236                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
2237                         ac--; av++;
2238                         break;
2239
2240                 default:
2241                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
2242                 }
2243         }
2244         if (do_pipe == 1) {
2245                 if (pipe.pipe_nr == 0)
2246                         errx(EX_DATAERR, "pipe_nr must be > 0");
2247                 if (pipe.delay > 10000)
2248                         errx(EX_DATAERR, "delay must be < 10000");
2249         } else { /* do_pipe == 2, queue */
2250                 if (pipe.fs.parent_nr == 0)
2251                         errx(EX_DATAERR, "pipe must be > 0");
2252                 if (pipe.fs.weight >100)
2253                         errx(EX_DATAERR, "weight must be <= 100");
2254         }
2255         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
2256                 if (pipe.fs.qsize > 1024*1024)
2257                         errx(EX_DATAERR, "queue size must be < 1MB");
2258         } else {
2259                 if (pipe.fs.qsize > 100)
2260                         errx(EX_DATAERR, "2 <= queue size <= 100");
2261         }
2262         if (pipe.fs.flags_fs & DN_IS_RED) {
2263                 size_t len;
2264                 int lookup_depth, avg_pkt_size;
2265                 double s, idle, weight, w_q;
2266                 int clock_hz;
2267                 int t;
2268
2269                 if (pipe.fs.min_th >= pipe.fs.max_th)
2270                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
2271                         pipe.fs.min_th, pipe.fs.max_th);
2272                 if (pipe.fs.max_th == 0)
2273                     errx(EX_DATAERR, "max_th must be > 0");
2274
2275                 len = sizeof(int);
2276                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
2277                         &lookup_depth, &len, NULL, 0) == -1)
2278
2279                     errx(1, "sysctlbyname(\"%s\")",
2280                         "net.inet.ip.dummynet.red_lookup_depth");
2281                 if (lookup_depth == 0)
2282                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2283                         " must be greater than zero");
2284
2285                 len = sizeof(int);
2286                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2287                         &avg_pkt_size, &len, NULL, 0) == -1)
2288
2289                     errx(1, "sysctlbyname(\"%s\")",
2290                         "net.inet.ip.dummynet.red_avg_pkt_size");
2291                 if (avg_pkt_size == 0)
2292                         errx(EX_DATAERR,
2293                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2294                             " be greater than zero");
2295
2296                 len = sizeof(clock_hz);
2297                 if (sysctlbyname("net.inet.ip.dummynet.hz", &clock_hz, &len,
2298                                  NULL, 0) == -1) {
2299                         errx(1, "sysctlbyname(\"%s\")",
2300                              "net.inet.ip.dummynet.hz");
2301                 }
2302
2303                 /*
2304                  * Ticks needed for sending a medium-sized packet.
2305                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2306                  * do not have bandwidth information, because that is stored
2307                  * in the parent pipe, and also we have multiple queues
2308                  * competing for it. So we set s=0, which is not very
2309                  * correct. But on the other hand, why do we want RED with
2310                  * WF2Q+ ?
2311                  */
2312                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2313                         s = 0;
2314                 else
2315                         s = clock_hz * avg_pkt_size * 8 / pipe.bandwidth;
2316
2317                 /*
2318                  * max idle time (in ticks) before avg queue size becomes 0.
2319                  * NOTA:  (3/w_q) is approx the value x so that
2320                  * (1-w_q)^x < 10^-3.
2321                  */
2322                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2323                 idle = s * 3. / w_q;
2324                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2325                 if (!pipe.fs.lookup_step)
2326                         pipe.fs.lookup_step = 1;
2327                 weight = 1 - w_q;
2328                 for (t = pipe.fs.lookup_step; t > 0; --t)
2329                         weight *= weight;
2330                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2331         }
2332         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2333                             sizeof pipe);
2334         if (i)
2335                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2336 }
2337
2338 static void
2339 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2340 {
2341         int i, l;
2342
2343         for (i=0; i<6; i++)
2344                 addr[i] = mask[i] = 0;
2345         if (!strcmp(p, "any"))
2346                 return;
2347
2348         for (i=0; *p && i<6;i++, p++) {
2349                 addr[i] = strtol(p, &p, 16);
2350                 if (*p != ':') /* we start with the mask */
2351                         break;
2352         }
2353         if (*p == '/') { /* mask len */
2354                 l = strtol(p+1, &p, 0);
2355                 for (i=0; l>0; l -=8, i++)
2356                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2357         } else if (*p == '&') { /* mask */
2358                 for (i=0, p++; *p && i<6;i++, p++) {
2359                         mask[i] = strtol(p, &p, 16);
2360                         if (*p != ':')
2361                                 break;
2362                 }
2363         } else if (*p == '\0') {
2364                 for (i=0; i<6; i++)
2365                         mask[i] = 0xff;
2366         }
2367         for (i=0; i<6; i++)
2368                 addr[i] &= mask[i];
2369 }
2370
2371 /*
2372  * helper function, updates the pointer to cmd with the length
2373  * of the current command, and also cleans up the first word of
2374  * the new command in case it has been clobbered before.
2375  */
2376 static ipfw_insn *
2377 next_cmd(ipfw_insn *cmd)
2378 {
2379         cmd += F_LEN(cmd);
2380         bzero(cmd, sizeof(*cmd));
2381         return cmd;
2382 }
2383
2384 /*
2385  * A function to fill simple commands of size 1.
2386  * Existing flags are preserved.
2387  */
2388 static void
2389 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2390 {
2391         cmd->opcode = opcode;
2392         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2393         cmd->arg1 = arg;
2394 }
2395
2396 /*
2397  * Fetch and add the MAC address and type, with masks. This generates one or
2398  * two microinstructions, and returns the pointer to the last one.
2399  */
2400 static ipfw_insn *
2401 add_mac(ipfw_insn *cmd, int ac, char *av[])
2402 {
2403         ipfw_insn_mac *mac;
2404
2405         if (ac < 2)
2406                 errx(EX_DATAERR, "MAC dst src");
2407
2408         cmd->opcode = O_MACADDR2;
2409         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2410
2411         mac = (ipfw_insn_mac *)cmd;
2412         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2413         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2414         return cmd;
2415 }
2416
2417 static ipfw_insn *
2418 add_mactype(ipfw_insn *cmd, int ac, char *av)
2419 {
2420         if (ac < 1)
2421                 errx(EX_DATAERR, "missing MAC type");
2422         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2423                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2424                 cmd->opcode = O_MAC_TYPE;
2425                 return cmd;
2426         } else
2427                 return NULL;
2428 }
2429
2430 static ipfw_insn *
2431 add_proto(ipfw_insn *cmd, char *av)
2432 {
2433         struct protoent *pe;
2434         u_char proto = 0;
2435
2436         if (!strncmp(av, "all", strlen(av)))
2437                 ; /* same as "ip" */
2438         else if ((proto = atoi(av)) > 0)
2439                 ; /* all done! */
2440         else if ((pe = getprotobyname(av)) != NULL)
2441                 proto = pe->p_proto;
2442         else
2443                 return NULL;
2444         if (proto != IPPROTO_IP)
2445                 fill_cmd(cmd, O_PROTO, 0, proto);
2446         return cmd;
2447 }
2448
2449 static ipfw_insn *
2450 add_srcip(ipfw_insn *cmd, char *av)
2451 {
2452         fill_ip((ipfw_insn_ip *)cmd, av);
2453         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2454                 cmd->opcode = O_IP_SRC_SET;
2455         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2456                 cmd->opcode = O_IP_SRC_ME;
2457         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2458                 cmd->opcode = O_IP_SRC;
2459         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2460                 cmd->opcode = O_IP_SRC_MASK;
2461         return cmd;
2462 }
2463
2464 static ipfw_insn *
2465 add_dstip(ipfw_insn *cmd, char *av)
2466 {
2467         fill_ip((ipfw_insn_ip *)cmd, av);
2468         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2469                 ;
2470         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2471                 cmd->opcode = O_IP_DST_ME;
2472         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2473                 cmd->opcode = O_IP_DST;
2474         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2475                 cmd->opcode = O_IP_DST_MASK;
2476         return cmd;
2477 }
2478
2479 static ipfw_insn *
2480 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2481 {
2482         if (!strncmp(av, "any", strlen(av))) {
2483                 return NULL;
2484         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2485                 /* XXX todo: check that we have a protocol with ports */
2486                 cmd->opcode = opcode;
2487                 return cmd;
2488         }
2489         return NULL;
2490 }
2491
2492 /*
2493  * Parse arguments and assemble the microinstructions which make up a rule.
2494  * Rules are added into the 'rulebuf' and then copied in the correct order
2495  * into the actual rule.
2496  *
2497  * The syntax for a rule starts with the action, followed by an
2498  * optional log action, and the various match patterns.
2499  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2500  * (generated if the rule includes a keep-state option), then the
2501  * various match patterns, the "log" action, and the actual action.
2502  *
2503  */
2504 static void
2505 add(int ac, char *av[])
2506 {
2507         /*
2508          * rules are added into the 'rulebuf' and then copied in
2509          * the correct order into the actual rule.
2510          * Some things that need to go out of order (prob, action etc.)
2511          * go into actbuf[].
2512          */
2513         static uint32_t rulebuf[IPFW_RULE_SIZE_MAX];
2514         static uint32_t actbuf[IPFW_RULE_SIZE_MAX];
2515         static uint32_t cmdbuf[IPFW_RULE_SIZE_MAX];
2516
2517         ipfw_insn *src, *dst, *cmd, *action, *prev = NULL;
2518         ipfw_insn *first_cmd;   /* first match pattern */
2519
2520         struct ipfw_ioc_rule *rule;
2521
2522         /*
2523          * various flags used to record that we entered some fields.
2524          */
2525         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2526
2527         int i;
2528
2529         int open_par = 0;       /* open parenthesis ( */
2530
2531         /* proto is here because it is used to fetch ports */
2532         u_char proto = IPPROTO_IP;      /* default protocol */
2533
2534         double match_prob = 1; /* match probability, default is always match */
2535
2536         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2537         bzero(cmdbuf, sizeof(cmdbuf));
2538         bzero(rulebuf, sizeof(rulebuf));
2539
2540         rule = (struct ipfw_ioc_rule *)rulebuf;
2541         cmd = (ipfw_insn *)cmdbuf;
2542         action = (ipfw_insn *)actbuf;
2543
2544         av++; ac--;
2545
2546         /* [rule N]     -- Rule number optional */
2547         if (ac && isdigit(**av)) {
2548                 rule->rulenum = atoi(*av);
2549                 av++;
2550                 ac--;
2551         }
2552
2553         /* [set N]      -- set number (0..30), optional */
2554         if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
2555                 int set = strtoul(av[1], NULL, 10);
2556                 if (set < 0 || set > 30)
2557                         errx(EX_DATAERR, "illegal set %s", av[1]);
2558                 rule->set = set;
2559                 av += 2; ac -= 2;
2560         }
2561
2562         /* [prob D]     -- match probability, optional */
2563         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2564                 match_prob = strtod(av[1], NULL);
2565
2566                 if (match_prob <= 0 || match_prob > 1)
2567                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2568                 av += 2; ac -= 2;
2569         }
2570
2571         /* action       -- mandatory */
2572         NEED1("missing action");
2573         i = match_token(rule_actions, *av);
2574         ac--; av++;
2575         action->len = 1;        /* default */
2576         switch(i) {
2577         case TOK_CHECKSTATE:
2578                 have_state = action;
2579                 action->opcode = O_CHECK_STATE;
2580                 break;
2581
2582         case TOK_ACCEPT:
2583                 action->opcode = O_ACCEPT;
2584                 break;
2585
2586         case TOK_DENY:
2587                 action->opcode = O_DENY;
2588                 action->arg1 = 0;
2589                 break;
2590
2591         case TOK_REJECT:
2592                 action->opcode = O_REJECT;
2593                 action->arg1 = ICMP_UNREACH_HOST;
2594                 break;
2595
2596         case TOK_RESET:
2597                 action->opcode = O_REJECT;
2598                 action->arg1 = ICMP_REJECT_RST;
2599                 break;
2600
2601         case TOK_UNREACH:
2602                 action->opcode = O_REJECT;
2603                 NEED1("missing reject code");
2604                 fill_reject_code(&action->arg1, *av);
2605                 ac--; av++;
2606                 break;
2607
2608         case TOK_COUNT:
2609                 action->opcode = O_COUNT;
2610                 break;
2611
2612         case TOK_QUEUE:
2613         case TOK_PIPE:
2614                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2615         case TOK_SKIPTO:
2616                 if (i == TOK_QUEUE)
2617                         action->opcode = O_QUEUE;
2618                 else if (i == TOK_PIPE)
2619                         action->opcode = O_PIPE;
2620                 else if (i == TOK_SKIPTO)
2621                         action->opcode = O_SKIPTO;
2622                 NEED1("missing skipto/pipe/queue number");
2623                 action->arg1 = strtoul(*av, NULL, 10);
2624                 av++; ac--;
2625                 break;
2626
2627         case TOK_DIVERT:
2628         case TOK_TEE:
2629                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2630                 NEED1("missing divert/tee port");
2631                 action->arg1 = strtoul(*av, NULL, 0);
2632                 if (action->arg1 == 0) {
2633                         struct servent *s;
2634                         setservent(1);
2635                         s = getservbyname(av[0], "divert");
2636                         if (s != NULL)
2637                                 action->arg1 = ntohs(s->s_port);
2638                         else
2639                                 errx(EX_DATAERR, "illegal divert/tee port");
2640                 }
2641                 ac--; av++;
2642                 break;
2643
2644         case TOK_FORWARD: {
2645                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2646                 char *s, *end;
2647
2648                 NEED1("missing forward address[:port]");
2649
2650                 action->opcode = O_FORWARD_IP;
2651                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2652
2653                 p->sa.sin_len = sizeof(struct sockaddr_in);
2654                 p->sa.sin_family = AF_INET;
2655                 p->sa.sin_port = 0;
2656                 /*
2657                  * locate the address-port separator (':' or ',')
2658                  */
2659                 s = strchr(*av, ':');
2660                 if (s == NULL)
2661                         s = strchr(*av, ',');
2662                 if (s != NULL) {
2663                         *(s++) = '\0';
2664                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2665                         if (s == end)
2666                                 errx(EX_DATAERR,
2667                                     "illegal forwarding port ``%s''", s);
2668                         p->sa.sin_port = (u_short)i;
2669                 }
2670                 lookup_host(*av, &(p->sa.sin_addr));
2671                 }
2672                 ac--; av++;
2673                 break;
2674
2675         default:
2676                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2677         }
2678         action = next_cmd(action);
2679
2680         /*
2681          * [log [logamount N]]  -- log, optional
2682          *
2683          * If exists, it goes first in the cmdbuf, but then it is
2684          * skipped in the copy section to the end of the buffer.
2685          */
2686         if (ac && !strncmp(*av, "log", strlen(*av))) {
2687                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2688
2689                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2690                 cmd->opcode = O_LOG;
2691                 av++; ac--;
2692                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2693                         ac--; av++;
2694                         NEED1("logamount requires argument");
2695                         c->max_log = atoi(*av);
2696                         if (c->max_log < 0)
2697                                 errx(EX_DATAERR, "logamount must be positive");
2698                         ac--; av++;
2699                 }
2700                 cmd = next_cmd(cmd);
2701         }
2702
2703         if (have_state) /* must be a check-state, we are done */
2704                 goto done;
2705
2706 #define OR_START(target)                                        \
2707         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2708                 if (open_par)                                   \
2709                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2710                 prev = NULL;                                    \
2711                 open_par = 1;                                   \
2712                 if ( (av[0])[1] == '\0') {                      \
2713                         ac--; av++;                             \
2714                 } else                                          \
2715                         (*av)++;                                \
2716         }                                                       \
2717         target:                                                 \
2718
2719
2720 #define CLOSE_PAR                                               \
2721         if (open_par) {                                         \
2722                 if (ac && (                                     \
2723                     !strncmp(*av, ")", strlen(*av)) ||          \
2724                     !strncmp(*av, "}", strlen(*av)) )) {        \
2725                         prev = NULL;                            \
2726                         open_par = 0;                           \
2727                         ac--; av++;                             \
2728                 } else                                          \
2729                         errx(EX_USAGE, "missing \")\"\n");      \
2730         }
2731
2732 #define NOT_BLOCK                                               \
2733         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2734                 if (cmd->len & F_NOT)                           \
2735                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2736                 cmd->len |= F_NOT;                              \
2737                 ac--; av++;                                     \
2738         }
2739
2740 #define OR_BLOCK(target)                                        \
2741         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2742                 if (prev == NULL || open_par == 0)              \
2743                         errx(EX_DATAERR, "invalid OR block");   \
2744                 prev->len |= F_OR;                              \
2745                 ac--; av++;                                     \
2746                 goto target;                                    \
2747         }                                                       \
2748         CLOSE_PAR;
2749
2750         first_cmd = cmd;
2751
2752 #if 0
2753         /*
2754          * MAC addresses, optional.
2755          * If we have this, we skip the part "proto from src to dst"
2756          * and jump straight to the option parsing.
2757          */
2758         NOT_BLOCK;
2759         NEED1("missing protocol");
2760         if (!strncmp(*av, "MAC", strlen(*av)) ||
2761             !strncmp(*av, "mac", strlen(*av))) {
2762                 ac--; av++;     /* the "MAC" keyword */
2763                 add_mac(cmd, ac, av); /* exits in case of errors */
2764                 cmd = next_cmd(cmd);
2765                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2766                 NOT_BLOCK;
2767                 NEED1("missing mac type");
2768                 if (add_mactype(cmd, ac, av[0]))
2769                         cmd = next_cmd(cmd);
2770                 ac--; av++;     /* any or mac-type */
2771                 goto read_options;
2772         }
2773 #endif
2774
2775         /*
2776          * protocol, mandatory
2777          */
2778     OR_START(get_proto);
2779         NOT_BLOCK;
2780         NEED1("missing protocol");
2781         if (add_proto(cmd, *av)) {
2782                 av++; ac--;
2783                 if (F_LEN(cmd) == 0)    /* plain IP */
2784                         proto = 0;
2785                 else {
2786                         proto = cmd->arg1;
2787                         prev = cmd;
2788                         cmd = next_cmd(cmd);
2789                 }
2790         } else if (first_cmd != cmd) {
2791                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2792         } else
2793                 goto read_options;
2794     OR_BLOCK(get_proto);
2795
2796         /*
2797          * "from", mandatory
2798          */
2799         if (!ac || strncmp(*av, "from", strlen(*av)))
2800                 errx(EX_USAGE, "missing ``from''");
2801         ac--; av++;
2802
2803         /*
2804          * source IP, mandatory
2805          */
2806     OR_START(source_ip);
2807         NOT_BLOCK;      /* optional "not" */
2808         NEED1("missing source address");
2809         if (add_srcip(cmd, *av)) {
2810                 ac--; av++;
2811                 if (F_LEN(cmd) != 0) {  /* ! any */
2812                         prev = cmd;
2813                         cmd = next_cmd(cmd);
2814                 }
2815         }
2816     OR_BLOCK(source_ip);
2817
2818         /*
2819          * source ports, optional
2820          */
2821         NOT_BLOCK;      /* optional "not" */
2822         if (ac) {
2823                 if (!strncmp(*av, "any", strlen(*av)) ||
2824                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2825                         ac--; av++;
2826                         if (F_LEN(cmd) != 0)
2827                                 cmd = next_cmd(cmd);
2828                 }
2829         }
2830
2831         /*
2832          * "to", mandatory
2833          */
2834         if (!ac || strncmp(*av, "to", strlen(*av)))
2835                 errx(EX_USAGE, "missing ``to''");
2836         av++; ac--;
2837
2838         /*
2839          * destination, mandatory
2840          */
2841     OR_START(dest_ip);
2842         NOT_BLOCK;      /* optional "not" */
2843         NEED1("missing dst address");
2844         if (add_dstip(cmd, *av)) {
2845                 ac--; av++;
2846                 if (F_LEN(cmd) != 0) {  /* ! any */
2847                         prev = cmd;
2848                         cmd = next_cmd(cmd);
2849                 }
2850         }
2851     OR_BLOCK(dest_ip);
2852
2853         /*
2854          * dest. ports, optional
2855          */
2856         NOT_BLOCK;      /* optional "not" */
2857         if (ac) {
2858                 if (!strncmp(*av, "any", strlen(*av)) ||
2859                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
2860                         ac--; av++;
2861                         if (F_LEN(cmd) != 0)
2862                                 cmd = next_cmd(cmd);
2863                 }
2864         }
2865
2866 read_options:
2867         if (ac && first_cmd == cmd) {
2868                 /*
2869                  * nothing specified so far, store in the rule to ease
2870                  * printout later.
2871                  */
2872                  rule->usr_flags = IPFW_USR_F_NORULE;
2873         }
2874         prev = NULL;
2875         while (ac) {
2876                 char *s;
2877                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
2878
2879                 s = *av;
2880                 cmd32 = (ipfw_insn_u32 *)cmd;
2881
2882                 if (*s == '!') {        /* alternate syntax for NOT */
2883                         if (cmd->len & F_NOT)
2884                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2885                         cmd->len = F_NOT;
2886                         s++;
2887                 }
2888                 i = match_token(rule_options, s);
2889                 ac--; av++;
2890                 switch(i) {
2891                 case TOK_NOT:
2892                         if (cmd->len & F_NOT)
2893                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2894                         cmd->len = F_NOT;
2895                         break;
2896
2897                 case TOK_OR:
2898                         if (open_par == 0 || prev == NULL)
2899                                 errx(EX_USAGE, "invalid \"or\" block\n");
2900                         prev->len |= F_OR;
2901                         break;
2902
2903                 case TOK_STARTBRACE:
2904                         if (open_par)
2905                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
2906                         open_par = 1;
2907                         break;
2908
2909                 case TOK_ENDBRACE:
2910                         if (!open_par)
2911                                 errx(EX_USAGE, "+missing \")\"\n");
2912                         open_par = 0;
2913                         prev = NULL;
2914                         break;
2915
2916                 case TOK_IN:
2917                         fill_cmd(cmd, O_IN, 0, 0);
2918                         break;
2919
2920                 case TOK_OUT:
2921                         cmd->len ^= F_NOT; /* toggle F_NOT */
2922                         fill_cmd(cmd, O_IN, 0, 0);
2923                         break;
2924
2925                 case TOK_FRAG:
2926                         fill_cmd(cmd, O_FRAG, 0, 0);
2927                         break;
2928
2929                 case TOK_LAYER2:
2930                         fill_cmd(cmd, O_LAYER2, 0, 0);
2931                         break;
2932
2933                 case TOK_XMIT:
2934                 case TOK_RECV:
2935                 case TOK_VIA:
2936                         NEED1("recv, xmit, via require interface name"
2937                                 " or address");
2938                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2939                         ac--; av++;
2940                         if (F_LEN(cmd) == 0)    /* not a valid address */
2941                                 break;
2942                         if (i == TOK_XMIT)
2943                                 cmd->opcode = O_XMIT;
2944                         else if (i == TOK_RECV)
2945                                 cmd->opcode = O_RECV;
2946                         else if (i == TOK_VIA)
2947                                 cmd->opcode = O_VIA;
2948                         break;
2949
2950                 case TOK_ICMPTYPES:
2951                         NEED1("icmptypes requires list of types");
2952                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
2953                         av++; ac--;
2954                         break;
2955
2956                 case TOK_IPTTL:
2957                         NEED1("ipttl requires TTL");
2958                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2959                         ac--; av++;
2960                         break;
2961
2962                 case TOK_IPID:
2963                         NEED1("ipid requires length");
2964                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2965                         ac--; av++;
2966                         break;
2967
2968                 case TOK_IPLEN:
2969                         NEED1("iplen requires length");
2970                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2971                         ac--; av++;
2972                         break;
2973
2974                 case TOK_IPVER:
2975                         NEED1("ipver requires version");
2976                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2977                         ac--; av++;
2978                         break;
2979
2980                 case TOK_IPPRECEDENCE:
2981                         NEED1("ipprecedence requires value");
2982                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
2983                             (strtoul(*av, NULL, 0) & 7) << 5);
2984                         ac--; av++;
2985                         break;
2986
2987                 case TOK_IPOPTS:
2988                         NEED1("missing argument for ipoptions");
2989                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
2990                         ac--; av++;
2991                         break;
2992
2993                 case TOK_IPTOS:
2994                         NEED1("missing argument for iptos");
2995                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
2996                         ac--; av++;
2997                         break;
2998
2999                 case TOK_UID:
3000                         NEED1("uid requires argument");
3001                     {
3002                         char *end;
3003                         uid_t uid;
3004                         struct passwd *pwd;
3005
3006                         cmd->opcode = O_UID;
3007                         uid = strtoul(*av, &end, 0);
3008                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3009                         if (pwd == NULL)
3010                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3011                         cmd32->d[0] = pwd->pw_uid;
3012                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3013                         ac--; av++;
3014                     }
3015                         break;
3016
3017                 case TOK_GID:
3018                         NEED1("gid requires argument");
3019                     {
3020                         char *end;
3021                         gid_t gid;
3022                         struct group *grp;
3023
3024                         cmd->opcode = O_GID;
3025                         gid = strtoul(*av, &end, 0);
3026                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3027                         if (grp == NULL)
3028                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3029                         cmd32->d[0] = grp->gr_gid;
3030                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3031                         ac--; av++;
3032                     }
3033                         break;
3034
3035                 case TOK_ESTAB:
3036                         fill_cmd(cmd, O_ESTAB, 0, 0);
3037                         break;
3038
3039                 case TOK_SETUP:
3040                         fill_cmd(cmd, O_TCPFLAGS, 0,
3041                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3042                         break;
3043
3044                 case TOK_TCPOPTS:
3045                         NEED1("missing argument for tcpoptions");
3046                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3047                         ac--; av++;
3048                         break;
3049
3050                 case TOK_TCPSEQ:
3051                 case TOK_TCPACK:
3052                         NEED1("tcpseq/tcpack requires argument");
3053                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3054                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3055                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3056                         ac--; av++;
3057                         break;
3058
3059                 case TOK_TCPWIN:
3060                         NEED1("tcpwin requires length");
3061                         fill_cmd(cmd, O_TCPWIN, 0,
3062                             htons(strtoul(*av, NULL, 0)));
3063                         ac--; av++;
3064                         break;
3065
3066                 case TOK_TCPFLAGS:
3067                         NEED1("missing argument for tcpflags");
3068                         cmd->opcode = O_TCPFLAGS;
3069                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3070                         ac--; av++;
3071                         break;
3072
3073                 case TOK_KEEPSTATE:
3074                         if (open_par)
3075                                 errx(EX_USAGE, "keep-state cannot be part "
3076                                     "of an or block");
3077                         if (have_state)
3078                                 errx(EX_USAGE, "only one of keep-state "
3079                                         "and limit is allowed");
3080                         have_state = cmd;
3081                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3082                         break;
3083
3084                 case TOK_LIMIT:
3085                         if (open_par)
3086                                 errx(EX_USAGE, "limit cannot be part "
3087                                     "of an or block");
3088                         if (have_state)
3089                                 errx(EX_USAGE, "only one of keep-state "
3090                                         "and limit is allowed");
3091                         NEED1("limit needs mask and # of connections");
3092                         have_state = cmd;
3093                     {
3094                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3095
3096                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3097                         cmd->opcode = O_LIMIT;
3098                         c->limit_mask = 0;
3099                         c->conn_limit = 0;
3100                         for (; ac >1 ;) {
3101                                 int val;
3102
3103                                 val = match_token(limit_masks, *av);
3104                                 if (val <= 0)
3105                                         break;
3106                                 c->limit_mask |= val;
3107                                 ac--; av++;
3108                         }
3109                         c->conn_limit = atoi(*av);
3110                         if (c->conn_limit == 0)
3111                                 errx(EX_USAGE, "limit: limit must be >0");
3112                         if (c->limit_mask == 0)
3113                                 errx(EX_USAGE, "missing limit mask");
3114                         ac--; av++;
3115                     }
3116                         break;
3117
3118                 case TOK_PROTO:
3119                         NEED1("missing protocol");
3120                         if (add_proto(cmd, *av)) {
3121                                 proto = cmd->arg1;
3122                                 ac--; av++;
3123                         } else
3124                                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3125                         break;
3126
3127                 case TOK_SRCIP:
3128                         NEED1("missing source IP");
3129                         if (add_srcip(cmd, *av)) {
3130                                 ac--; av++;
3131                         }
3132                         break;
3133
3134                 case TOK_DSTIP:
3135                         NEED1("missing destination IP");
3136                         if (add_dstip(cmd, *av)) {
3137                                 ac--; av++;
3138                         }
3139                         break;
3140
3141                 case TOK_SRCPORT:
3142                         NEED1("missing source port");
3143                         if (!strncmp(*av, "any", strlen(*av)) ||
3144                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3145                                 ac--; av++;
3146                         } else
3147                                 errx(EX_DATAERR, "invalid source port %s", *av);
3148                         break;
3149
3150                 case TOK_DSTPORT:
3151                         NEED1("missing destination port");
3152                         if (!strncmp(*av, "any", strlen(*av)) ||
3153                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3154                                 ac--; av++;
3155                         } else
3156                                 errx(EX_DATAERR, "invalid destination port %s",
3157                                     *av);
3158                         break;
3159
3160                 case TOK_MAC:
3161                         if (ac < 2)
3162                                 errx(EX_USAGE, "MAC dst-mac src-mac");
3163                         if (add_mac(cmd, ac, av)) {
3164                                 ac -= 2; av += 2;
3165                         }
3166                         break;
3167
3168                 case TOK_MACTYPE:
3169                         NEED1("missing mac type");
3170                         if (!add_mactype(cmd, ac, *av))
3171                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3172                         ac--; av++;
3173                         break;
3174
3175                 default:
3176                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3177                 }
3178                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3179                         prev = cmd;
3180                         cmd = next_cmd(cmd);
3181                 }
3182         }
3183
3184 done:
3185         /*
3186          * Now copy stuff into the rule.
3187          * If we have a keep-state option, the first instruction
3188          * must be a PROBE_STATE (which is generated here).
3189          * If we have a LOG option, it was stored as the first command,
3190          * and now must be moved to the top of the action part.
3191          */
3192         dst = (ipfw_insn *)rule->cmd;
3193
3194         /*
3195          * First thing to write into the command stream is the match probability.
3196          */
3197         if (match_prob != 1) { /* 1 means always match */
3198                 dst->opcode = O_PROB;
3199                 dst->len = 2;
3200                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3201                 dst += dst->len;
3202         }
3203
3204         /*
3205          * generate O_PROBE_STATE if necessary
3206          */
3207         if (have_state && have_state->opcode != O_CHECK_STATE) {
3208                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3209                 dst = next_cmd(dst);
3210         }
3211         /*
3212          * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT
3213          */
3214         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3215                 i = F_LEN(src);
3216
3217                 switch (src->opcode) {
3218                 case O_LOG:
3219                 case O_KEEP_STATE:
3220                 case O_LIMIT:
3221                         break;
3222                 default:
3223                         bcopy(src, dst, i * sizeof(u_int32_t));
3224                         dst += i;
3225                 }
3226         }
3227
3228         /*
3229          * put back the have_state command as last opcode
3230          */
3231         if (have_state && have_state->opcode != O_CHECK_STATE) {
3232                 i = F_LEN(have_state);
3233                 bcopy(have_state, dst, i * sizeof(u_int32_t));
3234                 dst += i;
3235         }
3236         /*
3237          * start action section
3238          */
3239         rule->act_ofs = dst - rule->cmd;
3240
3241         /*
3242          * put back O_LOG if necessary
3243          */
3244         src = (ipfw_insn *)cmdbuf;
3245         if ( src->opcode == O_LOG ) {
3246                 i = F_LEN(src);
3247                 bcopy(src, dst, i * sizeof(u_int32_t));
3248                 dst += i;
3249         }
3250         /*
3251          * copy all other actions
3252          */
3253         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3254                 i = F_LEN(src);
3255                 bcopy(src, dst, i * sizeof(u_int32_t));
3256                 dst += i;
3257         }
3258
3259         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
3260         i = (void *)dst - (void *)rule;
3261         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
3262                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3263         if (!do_quiet)
3264                 show_ipfw(rule, 10, 10);
3265 }
3266
3267 static void
3268 zero(int ac, char *av[])
3269 {
3270         int rulenum;
3271         int failed = EX_OK;
3272
3273         av++; ac--;
3274
3275         if (!ac) {
3276                 /* clear all entries */
3277                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
3278                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
3279                 if (!do_quiet)
3280                         printf("Accounting cleared.\n");
3281
3282                 return;
3283         }
3284
3285         while (ac) {
3286                 /* Rule number */
3287                 if (isdigit(**av)) {
3288                         rulenum = atoi(*av);
3289                         av++;
3290                         ac--;
3291                         if (setsockopt(s, IPPROTO_IP,
3292                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
3293                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
3294                                     rulenum);
3295                                 failed = EX_UNAVAILABLE;
3296                         } else if (!do_quiet)
3297                                 printf("Entry %d cleared\n", rulenum);
3298                 } else {
3299                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3300                 }
3301         }
3302         if (failed != EX_OK)
3303                 exit(failed);
3304 }
3305
3306 static void
3307 resetlog(int ac, char *av[])
3308 {
3309         int rulenum;
3310         int failed = EX_OK;
3311
3312         av++; ac--;
3313
3314         if (!ac) {
3315                 /* clear all entries */
3316                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
3317                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
3318                 if (!do_quiet)
3319                         printf("Logging counts reset.\n");
3320
3321                 return;
3322         }
3323
3324         while (ac) {
3325                 /* Rule number */
3326                 if (isdigit(**av)) {
3327                         rulenum = atoi(*av);
3328                         av++;
3329                         ac--;
3330                         if (setsockopt(s, IPPROTO_IP,
3331                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
3332                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
3333                                     rulenum);
3334                                 failed = EX_UNAVAILABLE;
3335                         } else if (!do_quiet)
3336                                 printf("Entry %d logging count reset\n",
3337                                     rulenum);
3338                 } else {
3339                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
3340                 }
3341         }
3342         if (failed != EX_OK)
3343                 exit(failed);
3344 }
3345
3346 static void
3347 flush(void)
3348 {
3349         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3350
3351         if (!do_force && !do_quiet) { /* need to ask user */
3352                 int c;
3353
3354                 printf("Are you sure? [yn] ");
3355                 fflush(stdout);
3356                 do {
3357                         c = toupper(getc(stdin));
3358                         while (c != '\n' && getc(stdin) != '\n')
3359                                 if (feof(stdin))
3360                                         return; /* and do not flush */
3361                 } while (c != 'Y' && c != 'N');
3362                 printf("\n");
3363                 if (c == 'N')   /* user said no */
3364                         return;
3365         }
3366         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
3367                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3368                     do_pipe ? "DUMMYNET" : "FW");
3369         if (!do_quiet)
3370                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
3371 }
3372
3373 static int
3374 ipfw_main(int ac, char **av)
3375 {
3376         int ch;
3377
3378         if (ac == 1)
3379                 show_usage();
3380
3381         /* Set the force flag for non-interactive processes */
3382         do_force = !isatty(STDIN_FILENO);
3383
3384         optind = optreset = 1;
3385         while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
3386                 switch (ch) {
3387                 case 'h': /* help */
3388                         help();
3389                         break;  /* NOTREACHED */
3390
3391                 case 's': /* sort */
3392                         do_sort = atoi(optarg);
3393                         break;
3394                 case 'a':
3395                         do_acct = 1;
3396                         break;
3397                 case 'c':
3398                         do_compact = 1;
3399                         break;
3400                 case 'd':
3401                         do_dynamic = 1;
3402                         break;
3403                 case 'e':
3404                         do_expired = 1;
3405                         break;
3406                 case 'f':
3407                         do_force = 1;
3408                         break;
3409                 case 'N':
3410                         do_resolv = 1;
3411                         break;
3412                 case 'q':
3413                         do_quiet = 1;
3414                         break;
3415                 case 'S':
3416                         show_sets = 1;
3417                         break;
3418                 case 't':
3419                         do_time = 1;
3420                         break;
3421                 case 'v': /* verbose */
3422                         verbose++;
3423                         break;
3424                 default:
3425                         show_usage();
3426                 }
3427
3428         ac -= optind;
3429         av += optind;
3430         NEED1("bad arguments, for usage summary ``ipfw''");
3431
3432         /*
3433          * optional: pipe or queue
3434          */
3435         if (!strncmp(*av, "pipe", strlen(*av))) {
3436                 do_pipe = 1;
3437                 ac--;
3438                 av++;
3439         } else if (!strncmp(*av, "queue", strlen(*av))) {
3440                 do_pipe = 2;
3441                 ac--;
3442                 av++;
3443         }
3444         NEED1("missing command");
3445
3446         /*
3447          * for pipes and queues we normally say 'pipe NN config'
3448          * but the code is easier to parse as 'pipe config NN'
3449          * so we swap the two arguments.
3450          */
3451         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
3452                 char *p = av[0];
3453                 av[0] = av[1];
3454                 av[1] = p;
3455         }
3456         if (!strncmp(*av, "add", strlen(*av)))
3457                 add(ac, av);
3458         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
3459                 config_pipe(ac, av);
3460         else if (!strncmp(*av, "delete", strlen(*av)))
3461                 delete(ac, av);
3462         else if (!strncmp(*av, "flush", strlen(*av)))
3463                 flush();
3464         else if (!strncmp(*av, "zero", strlen(*av)))
3465                 zero(ac, av);
3466         else if (!strncmp(*av, "resetlog", strlen(*av)))
3467                 resetlog(ac, av);
3468         else if (!strncmp(*av, "print", strlen(*av)) ||
3469                  !strncmp(*av, "list", strlen(*av)))
3470                 list(ac, av);
3471         else if (!strncmp(*av, "enable", strlen(*av)))
3472                 sysctl_handler(ac, av, 1);
3473         else if (!strncmp(*av, "disable", strlen(*av)))
3474                 sysctl_handler(ac, av, 0);
3475         else if (!strncmp(*av, "set", strlen(*av)))
3476                 sets_handler(ac, av);
3477         else if (!strncmp(*av, "show", strlen(*av))) {
3478                 do_acct++;
3479                 list(ac, av);
3480         } else
3481                 errx(EX_USAGE, "bad command `%s'", *av);
3482         return 0;
3483 }
3484
3485
3486 static void
3487 ipfw_readfile(int ac, char *av[])
3488 {
3489 #define MAX_ARGS        32
3490 #define WHITESP         " \t\f\v\n\r"
3491         char    buf[BUFSIZ];
3492         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3493         char    linename[10];
3494         int     i=0, lineno=0, qflag=0, pflag=0, status;
3495         FILE    *f = NULL;
3496         pid_t   preproc = 0;
3497         int     c;
3498
3499         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3500                 switch(c) {
3501                 case 'D':
3502                         if (!pflag)
3503                                 errx(EX_USAGE, "-D requires -p");
3504                         if (i > MAX_ARGS - 2)
3505                                 errx(EX_USAGE,
3506                                      "too many -D or -U options");
3507                         args[i++] = "-D";
3508                         args[i++] = optarg;
3509                         break;
3510
3511                 case 'U':
3512                         if (!pflag)
3513                                 errx(EX_USAGE, "-U requires -p");
3514                         if (i > MAX_ARGS - 2)
3515                                 errx(EX_USAGE,
3516                                      "too many -D or -U options");
3517                         args[i++] = "-U";
3518                         args[i++] = optarg;
3519                         break;
3520
3521                 case 'p':
3522                         pflag = 1;
3523                         cmd = optarg;
3524                         args[0] = cmd;
3525                         i = 1;
3526                         break;
3527
3528                 case 'q':
3529                         qflag = 1;
3530                         break;
3531
3532                 default:
3533                         errx(EX_USAGE, "bad arguments, for usage"
3534                              " summary ``ipfw''");
3535                 }
3536
3537         av += optind;
3538         ac -= optind;
3539         if (ac != 1)
3540                 errx(EX_USAGE, "extraneous filename arguments");
3541
3542         if ((f = fopen(av[0], "r")) == NULL)
3543                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3544
3545         if (pflag) {
3546                 /* pipe through preprocessor (cpp or m4) */
3547                 int pipedes[2];
3548
3549                 args[i] = NULL;
3550
3551                 if (pipe(pipedes) == -1)
3552                         err(EX_OSERR, "cannot create pipe");
3553
3554                 switch((preproc = fork())) {
3555                 case -1:
3556                         err(EX_OSERR, "cannot fork");
3557
3558                 case 0:
3559                         /* child */
3560                         if (dup2(fileno(f), 0) == -1
3561                             || dup2(pipedes[1], 1) == -1)
3562                                 err(EX_OSERR, "dup2()");
3563                         fclose(f);
3564                         close(pipedes[1]);
3565                         close(pipedes[0]);
3566                         execvp(cmd, args);
3567                         err(EX_OSERR, "execvp(%s) failed", cmd);
3568
3569                 default:
3570                         /* parent */
3571                         fclose(f);
3572                         close(pipedes[1]);
3573                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3574                                 int savederrno = errno;
3575
3576                                 kill(preproc, SIGTERM);
3577                                 errno = savederrno;
3578                                 err(EX_OSERR, "fdopen()");
3579                         }
3580                 }
3581         }
3582
3583         while (fgets(buf, BUFSIZ, f)) {
3584                 lineno++;
3585                 sprintf(linename, "Line %d", lineno);
3586                 args[0] = linename;
3587
3588                 if (*buf == '#')
3589                         continue;
3590                 if ((p = strchr(buf, '#')) != NULL)
3591                         *p = '\0';
3592                 i = 1;
3593                 if (qflag)
3594                         args[i++] = "-q";
3595                 for (a = strtok(buf, WHITESP);
3596                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3597                         args[i] = a;
3598                 if (i == (qflag? 2: 1))
3599                         continue;
3600                 if (i == MAX_ARGS)
3601                         errx(EX_USAGE, "%s: too many arguments",
3602                             linename);
3603                 args[i] = NULL;
3604
3605                 ipfw_main(i, args);
3606         }
3607         fclose(f);
3608         if (pflag) {
3609                 if (waitpid(preproc, &status, 0) == -1)
3610                         errx(EX_OSERR, "waitpid()");
3611                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3612                         errx(EX_UNAVAILABLE,
3613                             "preprocessor exited with status %d",
3614                             WEXITSTATUS(status));
3615                 else if (WIFSIGNALED(status))
3616                         errx(EX_UNAVAILABLE,
3617                             "preprocessor exited with signal %d",
3618                             WTERMSIG(status));
3619         }
3620 }
3621
3622 int
3623 main(int ac, char *av[])
3624 {
3625         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3626         if (s < 0)
3627                 err(EX_UNAVAILABLE, "socket");
3628
3629         /*
3630          * If the last argument is an absolute pathname, interpret it
3631          * as a file to be preprocessed.
3632          */
3633
3634         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3635                 ipfw_readfile(ac, av);
3636         else
3637                 ipfw_main(ac, av);
3638         return EX_OK;
3639 }