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  * $FreeBSD$
  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 <timeconv.h>
  44 #include <unistd.h>
  45 #include <sysexits.h>
  46
  47 #include <net/if.h>
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/ip_icmp.h>
  52 #include <netinet/ip_fw.h>
  53 #include <net/route.h> /* def. of struct route */
  54 #include <netinet/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                 verbose;
  69
  70 #define IP_MASK_ALL     0xffffffff
  71
  72 /*
  73  * structure to hold flag names and associated values to be
  74  * set in the appropriate masks.
  75  * A NULL string terminates the array.
  76  * Often, an element with 0 value contains an error string.
  77  *
  78  */
  79 struct _s_x {
  80         char *s;
  81         int x;
  82 };
  83
  84 static struct _s_x f_tcpflags[] = {
  85         { "syn", TH_SYN },
  86         { "fin", TH_FIN },
  87         { "ack", TH_ACK },
  88         { "psh", TH_PUSH },
  89         { "rst", TH_RST },
  90         { "urg", TH_URG },
  91         { "tcp flag", 0 },
  92         { NULL, 0 }
  93 };
  94
  95 static struct _s_x f_tcpopts[] = {
  96         { "mss",        IP_FW_TCPOPT_MSS },
  97         { "maxseg",     IP_FW_TCPOPT_MSS },
  98         { "window",     IP_FW_TCPOPT_WINDOW },
  99         { "sack",       IP_FW_TCPOPT_SACK },
 100         { "ts",         IP_FW_TCPOPT_TS },
 101         { "timestamp",  IP_FW_TCPOPT_TS },
 102         { "cc",         IP_FW_TCPOPT_CC },
 103         { "tcp option", 0 },
 104         { NULL, 0 }
 105 };
 106
 107 /*
 108  * IP options span the range 0 to 255 so we need to remap them
 109  * (though in fact only the low 5 bits are significant).
 110  */
 111 static struct _s_x f_ipopts[] = {
 112         { "ssrr",       IP_FW_IPOPT_SSRR},
 113         { "lsrr",       IP_FW_IPOPT_LSRR},
 114         { "rr",         IP_FW_IPOPT_RR},
 115         { "ts",         IP_FW_IPOPT_TS},
 116         { "ip option",  0 },
 117         { NULL, 0 }
 118 };
 119
 120 static struct _s_x f_iptos[] = {
 121         { "lowdelay",   IPTOS_LOWDELAY},
 122         { "throughput", IPTOS_THROUGHPUT},
 123         { "reliability", IPTOS_RELIABILITY},
 124         { "mincost",    IPTOS_MINCOST},
 125         { "congestion", IPTOS_CE},
 126         { "ecntransport", IPTOS_ECT},
 127         { "ip tos option", 0},
 128         { NULL, 0 }
 129 };
 130
 131 static struct _s_x limit_masks[] = {
 132         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 133         {"src-addr",    DYN_SRC_ADDR},
 134         {"src-port",    DYN_SRC_PORT},
 135         {"dst-addr",    DYN_DST_ADDR},
 136         {"dst-port",    DYN_DST_PORT},
 137         {NULL,          0}
 138 };
 139
 140 /*
 141  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 142  * This is only used in this code.
 143  */
 144 #define IPPROTO_ETHERTYPE       0x1000
 145 static struct _s_x ether_types[] = {
 146     /*
 147      * Note, we cannot use "-:&/" in the names because they are field
 148      * separators in the type specifications. Also, we use s = NULL as
 149      * end-delimiter, because a type of 0 can be legal.
 150      */
 151         { "ip",         0x0800 },
 152         { "ipv4",       0x0800 },
 153         { "ipv6",       0x86dd },
 154         { "arp",        0x0806 },
 155         { "rarp",       0x8035 },
 156         { "vlan",       0x8100 },
 157         { "loop",       0x9000 },
 158         { "trail",      0x1000 },
 159         { "at",         0x809b },
 160         { "atalk",      0x809b },
 161         { "aarp",       0x80f3 },
 162         { "pppoe_disc", 0x8863 },
 163         { "pppoe_sess", 0x8864 },
 164         { "ipx_8022",   0x00E0 },
 165         { "ipx_8023",   0x0000 },
 166         { "ipx_ii",     0x8137 },
 167         { "ipx_snap",   0x8137 },
 168         { "ipx",        0x8137 },
 169         { "ns",         0x0600 },
 170         { NULL,         0 }
 171 };
 172
 173 static void show_usage(void);
 174
 175 enum tokens {
 176         TOK_NULL=0,
 177
 178         TOK_OR,
 179         TOK_NOT,
 180
 181         TOK_ACCEPT,
 182         TOK_COUNT,
 183         TOK_PIPE,
 184         TOK_QUEUE,
 185         TOK_DIVERT,
 186         TOK_TEE,
 187         TOK_FORWARD,
 188         TOK_SKIPTO,
 189         TOK_DENY,
 190         TOK_REJECT,
 191         TOK_RESET,
 192         TOK_UNREACH,
 193         TOK_CHECKSTATE,
 194
 195         TOK_UID,
 196         TOK_GID,
 197         TOK_IN,
 198         TOK_LIMIT,
 199         TOK_KEEPSTATE,
 200         TOK_LAYER2,
 201         TOK_OUT,
 202         TOK_XMIT,
 203         TOK_RECV,
 204         TOK_VIA,
 205         TOK_FRAG,
 206         TOK_IPOPTS,
 207         TOK_IPLEN,
 208         TOK_IPID,
 209         TOK_IPPRECEDENCE,
 210         TOK_IPTOS,
 211         TOK_IPTTL,
 212         TOK_IPVER,
 213         TOK_ESTAB,
 214         TOK_SETUP,
 215         TOK_TCPFLAGS,
 216         TOK_TCPOPTS,
 217         TOK_TCPSEQ,
 218         TOK_TCPACK,
 219         TOK_TCPWIN,
 220         TOK_ICMPTYPES,
 221
 222         TOK_PLR,
 223         TOK_BUCKETS,
 224         TOK_DSTIP,
 225         TOK_SRCIP,
 226         TOK_DSTPORT,
 227         TOK_SRCPORT,
 228         TOK_ALL,
 229         TOK_MASK,
 230         TOK_BW,
 231         TOK_DELAY,
 232         TOK_RED,
 233         TOK_GRED,
 234         TOK_DROPTAIL,
 235         TOK_PROTO,
 236         TOK_WEIGHT,
 237 };
 238
 239 struct _s_x dummynet_params[] = {
 240         { "plr",                TOK_PLR },
 241         { "buckets",            TOK_BUCKETS },
 242         { "dst-ip",             TOK_DSTIP },
 243         { "src-ip",             TOK_SRCIP },
 244         { "dst-port",           TOK_DSTPORT },
 245         { "src-port",           TOK_SRCPORT },
 246         { "proto",              TOK_PROTO },
 247         { "weight",             TOK_WEIGHT },
 248         { "all",                TOK_ALL },
 249         { "mask",               TOK_MASK },
 250         { "droptail",           TOK_DROPTAIL },
 251         { "red",                TOK_RED },
 252         { "gred",               TOK_GRED },
 253         { "bw",                 TOK_BW },
 254         { "bandwidth",          TOK_BW },
 255         { "delay",              TOK_DELAY },
 256         { "pipe",               TOK_PIPE },
 257         { "queue",              TOK_QUEUE },
 258         { "dummynet-params",    TOK_NULL },
 259         { NULL, 0 }
 260 };
 261
 262 struct _s_x rule_actions[] = {
 263         { "accept",             TOK_ACCEPT },
 264         { "pass",               TOK_ACCEPT },
 265         { "allow",              TOK_ACCEPT },
 266         { "permit",             TOK_ACCEPT },
 267         { "count",              TOK_COUNT },
 268         { "pipe",               TOK_PIPE },
 269         { "queue",              TOK_QUEUE },
 270         { "divert",             TOK_DIVERT },
 271         { "tee",                TOK_TEE },
 272         { "fwd",                TOK_FORWARD },
 273         { "forward",            TOK_FORWARD },
 274         { "skipto",             TOK_SKIPTO },
 275         { "deny",               TOK_DENY },
 276         { "drop",               TOK_DENY },
 277         { "reject",             TOK_REJECT },
 278         { "reset",              TOK_RESET },
 279         { "unreach",            TOK_UNREACH },
 280         { "check-state",        TOK_CHECKSTATE },
 281         { NULL,                 TOK_NULL },
 282         { NULL, 0 }
 283 };
 284
 285 struct _s_x rule_options[] = {
 286         { "uid",                TOK_UID },
 287         { "gid",                TOK_GID },
 288         { "in",                 TOK_IN },
 289         { "limit",              TOK_LIMIT },
 290         { "keep-state",         TOK_KEEPSTATE },
 291         { "bridged",            TOK_LAYER2 },
 292         { "layer2",             TOK_LAYER2 },
 293         { "out",                TOK_OUT },
 294         { "xmit",               TOK_XMIT },
 295         { "recv",               TOK_RECV },
 296         { "via",                TOK_VIA },
 297         { "fragment",           TOK_FRAG },
 298         { "frag",               TOK_FRAG },
 299         { "ipoptions",          TOK_IPOPTS },
 300         { "ipopts",             TOK_IPOPTS },
 301         { "iplen",              TOK_IPLEN },
 302         { "ipid",               TOK_IPID },
 303         { "ipprecedence",       TOK_IPPRECEDENCE },
 304         { "iptos",              TOK_IPTOS },
 305         { "ipttl",              TOK_IPTTL },
 306         { "ipversion",          TOK_IPVER },
 307         { "ipver",              TOK_IPVER },
 308         { "estab",              TOK_ESTAB },
 309         { "established",        TOK_ESTAB },
 310         { "setup",              TOK_SETUP },
 311         { "tcpflags",           TOK_TCPFLAGS },
 312         { "tcpflgs",            TOK_TCPFLAGS },
 313         { "tcpoptions",         TOK_TCPOPTS },
 314         { "tcpopts",            TOK_TCPOPTS },
 315         { "tcpseq",             TOK_TCPSEQ },
 316         { "tcpack",             TOK_TCPACK },
 317         { "tcpwin",             TOK_TCPWIN },
 318         { "icmptype",           TOK_ICMPTYPES },
 319         { "icmptypes",          TOK_ICMPTYPES },
 320
 321         { "not",                TOK_NOT },              /* pseudo option */
 322         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 323         { "or",                 TOK_OR },               /* pseudo option */
 324         { "|", /* escape */     TOK_OR },               /* pseudo option */
 325         { NULL,                 TOK_NULL },
 326         { NULL, 0 }
 327 };
 328
 329 /**
 330  * match_token takes a table and a string, returns the value associated
 331  * with the string (0 meaning an error in most cases)
 332  */
 333 static int
 334 match_token(struct _s_x *table, char *string)
 335 {
 336         struct _s_x *pt;
 337         int i = strlen(string);
 338
 339         for (pt = table ; i && pt->s != NULL ; pt++)
 340                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 341                         return pt->x;
 342         return -1;
 343 };
 344
 345 static char *
 346 match_value(struct _s_x *p, u_int32_t value)
 347 {
 348         for (; p->s != NULL; p++)
 349                 if (p->x == value)
 350                         return p->s;
 351         return NULL;
 352 }
 353
 354 /*
 355  * prints one port, symbolic or numeric
 356  */
 357 static void
 358 print_port(int proto, u_int16_t port)
 359 {
 360
 361         if (proto == IPPROTO_ETHERTYPE) {
 362                 char *s;
 363
 364                 if (do_resolv && (s = match_value(ether_types, port)) )
 365                         printf("%s", s);
 366                 else
 367                         printf("0x%04x", port);
 368         } else {
 369                 struct servent *se = NULL;
 370                 if (do_resolv) {
 371                         struct protoent *pe = getprotobynumber(proto);
 372
 373                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 374                 }
 375                 if (se)
 376                         printf("%s", se->s_name);
 377                 else
 378                         printf("%d", port);
 379         }
 380 }
 381
 382 /*
 383  * print the values in a list of ports
 384  * XXX todo: add support for mask.
 385  */
 386 static void
 387 print_newports(ipfw_insn_u16 *cmd, int proto)
 388 {
 389         u_int16_t *p = cmd->ports;
 390         int i;
 391         char *sep= " ";
 392
 393         if (cmd->o.len & F_NOT)
 394                 printf(" not");
 395         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 396                 printf(sep);
 397                 print_port(proto, p[0]);
 398                 if (p[0] != p[1]) {
 399                         printf("-");
 400                         print_port(proto, p[1]);
 401                 }
 402                 sep = ",";
 403         }
 404 }
 405
 406 /*
 407  * Like strtol, but also translates service names into port numbers
 408  * for some protocols.
 409  * In particular:
 410  *      proto == -1 disables the protocol check;
 411  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 412  *      proto == <some value in /etc/protocols> matches the values there.
 413  */
 414 static int
 415 strtoport(char *s, char **end, int base, int proto)
 416 {
 417         char *s1, sep;
 418         int i;
 419
 420         if ( *s == '\0')
 421                 goto none;
 422
 423         if (isdigit(*s))
 424                 return strtol(s, end, base);
 425
 426         /*
 427          * find separator and replace with a '\0'
 428          */
 429         for (s1 = s; *s1 && isalnum(*s1) ; s1++)
 430                 ;
 431         sep = *s1;
 432         *s1 = '\0';
 433
 434         if (proto == IPPROTO_ETHERTYPE) {
 435                 i = match_token(ether_types, s);
 436                 *s1 = sep;
 437                 if (i == -1) {  /* not found */
 438                         *end = s;
 439                         return 0;
 440                 } else {
 441                         *end = s1;
 442                         return i;
 443                 }
 444         } else {
 445                 struct protoent *pe = NULL;
 446                 struct servent *se;
 447
 448                 if (proto != 0)
 449                         pe = getprotobynumber(proto);
 450                 setservent(1);
 451                 se = getservbyname(s, pe ? pe->p_name : NULL);
 452                 *s1 = sep;
 453                 if (se != NULL) {
 454                         *end = s1;
 455                         return ntohs(se->s_port);
 456                 }
 457         }
 458 none:
 459         *end = s;
 460         return 0;
 461 }
 462
 463 /*
 464  * fill the body of the command with the list of port ranges.
 465  * At the moment it only understands numeric ranges.
 466  */
 467 static int
 468 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 469 {
 470         u_int16_t *p = cmd->ports;
 471         int i = 0;
 472
 473         for (; *av ; i++, p +=2 ) {
 474                 u_int16_t a, b;
 475                 char *s;
 476
 477                 a = strtoport(av, &s, 0, proto);
 478                 if (s == av) /* no parameter */
 479                         break;
 480                 if (*s == '-') { /* a range */
 481                         av = s+1;
 482                         b = strtoport(av, &s, 0, proto);
 483                         if (s == av) /* no parameter */
 484                                 break;
 485                         p[0] = a;
 486                         p[1] = b;
 487                 } else if (*s == ',' || *s == '\0' ) {
 488                         p[0] = p[1] = a;
 489                 } else  /* invalid separator */
 490                         break;
 491                 av = s+1;
 492         }
 493         if (i > 0) {
 494                 if (i+1 > F_LEN_MASK)
 495                         errx(EX_DATAERR, "too many port range\n");
 496                 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
 497         }
 498         return i;
 499 }
 500
 501 static struct _s_x icmpcodes[] = {
 502       { "net",                  ICMP_UNREACH_NET },
 503       { "host",                 ICMP_UNREACH_HOST },
 504       { "protocol",             ICMP_UNREACH_PROTOCOL },
 505       { "port",                 ICMP_UNREACH_PORT },
 506       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 507       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 508       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 509       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 510       { "isolated",             ICMP_UNREACH_ISOLATED },
 511       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 512       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 513       { "tosnet",               ICMP_UNREACH_TOSNET },
 514       { "toshost",              ICMP_UNREACH_TOSHOST },
 515       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 516       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 517       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 518       { NULL, 0 }
 519 };
 520
 521 static void
 522 fill_reject_code(u_short *codep, char *str)
 523 {
 524         int val;
 525         char *s;
 526
 527         val = strtoul(str, &s, 0);
 528         if (s == str || *s != '\0' || val >= 0x100)
 529                 val = match_token(icmpcodes, str);
 530         if (val <= 0)
 531                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 532         *codep = val;
 533         return;
 534 }
 535
 536 static void
 537 print_reject_code(u_int16_t code)
 538 {
 539         char *s = match_value(icmpcodes, code);
 540
 541         if (s != NULL)
 542                 printf("unreach %s", s);
 543         else
 544                 printf("unreach %u", code);
 545 }
 546
 547 /*
 548  * Returns the number of bits set (from left) in a contiguous bitmask,
 549  * or -1 if the mask is not contiguous.
 550  * XXX this needs a proper fix.
 551  * This effectively works on masks in big-endian (network) format.
 552  * when compiled on little endian architectures.
 553  *
 554  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 555  * the first bit on the wire is bit 0 of the first byte.
 556  * len is the max length in bits.
 557  */
 558 static int
 559 contigmask(u_char *p, int len)
 560 {
 561         int i, n;
 562         for (i=0; i<len ; i++)
 563                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 564                         break;
 565         for (n=i+1; n < len; n++)
 566                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 567                         return -1; /* mask not contiguous */
 568         return i;
 569 }
 570
 571 /*
 572  * print flags set/clear in the two bitmasks passed as parameters.
 573  * There is a specialized check for f_tcpflags.
 574  */
 575 static void
 576 print_flags(char *name, ipfw_insn *cmd, struct _s_x *list)
 577 {
 578         char *comma="";
 579         int i;
 580         u_char set = cmd->arg1 & 0xff;
 581         u_char clear = (cmd->arg1 >> 8) & 0xff;
 582
 583         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 584                 printf(" setup");
 585                 return;
 586         }
 587
 588         printf(" %s ", name);
 589         for (i=0; list[i].x != 0; i++) {
 590                 if (set & list[i].x) {
 591                         set &= ~list[i].x;
 592                         printf("%s%s", comma, list[i].s);
 593                         comma = ",";
 594                 }
 595                 if (clear & list[i].x) {
 596                         clear &= ~list[i].x;
 597                         printf("%s!%s", comma, list[i].s);
 598                         comma = ",";
 599                 }
 600         }
 601 }
 602
 603 /*
 604  * Print the ip address contained in a command.
 605  */
 606 static void
 607 print_ip(ipfw_insn_ip *cmd)
 608 {
 609         struct hostent *he = NULL;
 610         int mb;
 611
 612         printf("%s ", cmd->o.len & F_NOT ? " not": "");
 613
 614         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 615                 printf("me");
 616                 return;
 617         }
 618         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 619                 u_int32_t x, *d;
 620                 int i;
 621                 char comma = '{';
 622
 623                 x = cmd->o.arg1 - 1;
 624                 x = htonl( ~x );
 625                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 626                 printf("%s/%d", inet_ntoa(cmd->addr),
 627                         contigmask((u_char *)&x, 32));
 628                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 629                 x &= 0xff; /* base */
 630                 d = (u_int32_t *)&(cmd->mask);
 631                 for (i=0; i < cmd->o.arg1; i++)
 632                         if (d[ i/32] & (1<<(i & 31))) {
 633                                 printf("%c%d", comma, i+x);
 634                                 comma = ',';
 635                         }
 636                 printf("}");
 637                 return;
 638         }
 639         if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
 640                 mb = 32;
 641         else
 642                 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
 643         if (mb == 32 && do_resolv)
 644                 he = gethostbyaddr((char *)&(cmd->addr.s_addr),
 645                     sizeof(u_long), AF_INET);
 646         if (he != NULL)         /* resolved to name */
 647                 printf("%s", he->h_name);
 648         else if (mb == 0)       /* any */
 649                 printf("any");
 650         else {          /* numeric IP followed by some kind of mask */
 651                 printf("%s", inet_ntoa(cmd->addr));
 652                 if (mb < 0)
 653                         printf(":%s", inet_ntoa(cmd->mask));
 654                 else if (mb < 32)
 655                         printf("/%d", mb);
 656         }
 657 }
 658
 659 /*
 660  * prints a MAC address/mask pair
 661  */
 662 static void
 663 print_mac(u_char *addr, u_char *mask)
 664 {
 665         int l = contigmask(mask, 48);
 666
 667         if (l == 0)
 668                 printf(" any");
 669         else {
 670                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 671                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 672                 if (l == -1)
 673                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 674                             mask[0], mask[1], mask[2],
 675                             mask[3], mask[4], mask[5]);
 676                 else if (l < 48)
 677                         printf("/%d", l);
 678         }
 679 }
 680
 681 static void
 682 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 683 {
 684         u_int8_t type;
 685
 686         cmd->d[0] = 0;
 687         while (*av) {
 688                 if (*av == ',')
 689                         av++;
 690
 691                 type = strtoul(av, &av, 0);
 692
 693                 if (*av != ',' && *av != '\0')
 694                         errx(EX_DATAERR, "invalid ICMP type");
 695
 696                 if (type > 31)
 697                         errx(EX_DATAERR, "ICMP type out of range");
 698
 699                 cmd->d[0] |= 1 << type;
 700         }
 701         cmd->o.opcode = O_ICMPTYPE;
 702         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 703 }
 704
 705 static void
 706 print_icmptypes(ipfw_insn_u32 *cmd)
 707 {
 708         int i;
 709         char sep= ' ';
 710
 711         printf(" icmptypes");
 712         for (i = 0; i < 32; i++) {
 713                 if ( (cmd->d[0] & (1 << (i))) == 0)
 714                         continue;
 715                 printf("%c%d", sep, i);
 716                 sep = ',';
 717         }
 718 }
 719
 720 /*
 721  * show_ipfw() prints the body of an ipfw rule.
 722  * Because the standard rule has at least proto src_ip dst_ip, we use
 723  * a helper function to produce these entries if not provided explicitly.
 724  */
 725 #define HAVE_PROTO      1
 726 #define HAVE_SRCIP      2
 727 #define HAVE_DSTIP      4
 728 #define HAVE_MAC        8
 729
 730 static void
 731 show_prerequisites(int *flags, int want)
 732 {
 733         if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
 734                 printf(" ip");
 735         if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 736                 printf(" from any");
 737         if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 738                 printf(" to any");
 739         *flags |= want;
 740 }
 741
 742 static void
 743 show_ipfw(struct ip_fw *rule)
 744 {
 745         int l;
 746         ipfw_insn *cmd;
 747         int proto = 0;          /* default */
 748         int flags = 0;  /* prerequisites */
 749         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 750         int or_block = 0;       /* we are in an or block */
 751
 752         printf("%05u ", rule->rulenum);
 753
 754         if (do_acct)
 755                 printf("%10qu %10qu ", rule->pcnt, rule->bcnt);
 756
 757         if (do_time) {
 758                 if (rule->timestamp) {
 759                         char timestr[30];
 760                         time_t t = _long_to_time(rule->timestamp);
 761
 762                         strcpy(timestr, ctime(&t));
 763                         *strchr(timestr, '\n') = '\0';
 764                         printf("%s ", timestr);
 765                 } else {
 766                         printf("                         ");
 767                 }
 768         }
 769
 770         /*
 771          * first print actions
 772          */
 773         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 774                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 775                 switch(cmd->opcode) {
 776                 case O_CHECK_STATE:
 777                         printf("check-state");
 778                         /* avoid printing anything else */
 779                         flags = HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP;
 780                         break;
 781
 782                 case O_PROB:
 783                     {
 784                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 785                         double d = 1.0 * p->d[0];
 786
 787                         d = 1 - (d / 0x7fffffff);
 788                         printf("prob %f ", d);
 789                     }
 790                         break;
 791
 792                 case O_ACCEPT:
 793                         printf("allow");
 794                         break;
 795
 796                 case O_COUNT:
 797                         printf("count");
 798                         break;
 799
 800                 case O_DENY:
 801                         printf("deny");
 802                         break;
 803
 804                 case O_REJECT:
 805                         if (cmd->arg1 == ICMP_REJECT_RST)
 806                                 printf("reset");
 807                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
 808                                 printf("reject");
 809                         else
 810                                 print_reject_code(cmd->arg1);
 811                         break;
 812
 813                 case O_SKIPTO:
 814                         printf("skipto %u", cmd->arg1);
 815                         break;
 816
 817                 case O_PIPE:
 818                         printf("pipe %u", cmd->arg1);
 819                         break;
 820
 821                 case O_QUEUE:
 822                         printf("queue %u", cmd->arg1);
 823                         break;
 824
 825                 case O_DIVERT:
 826                         printf("divert %u", cmd->arg1);
 827                         break;
 828
 829                 case O_TEE:
 830                         printf("tee %u", cmd->arg1);
 831                         break;
 832
 833                 case O_FORWARD_IP:
 834                     {
 835                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
 836
 837                         printf("fwd %s", inet_ntoa(s->sa.sin_addr));
 838                         if (s->sa.sin_port)
 839                                 printf(",%d", ntohs(s->sa.sin_port));
 840                     }
 841                         break;
 842
 843                 case O_LOG: /* O_LOG is printed last */
 844                         logptr = (ipfw_insn_log *)cmd;
 845                         break;
 846
 847                 default:
 848                         printf("** unrecognized action %d len %d",
 849                                 cmd->opcode, cmd->len);
 850                 }
 851         }
 852         if (logptr) {
 853                 if (logptr->max_log > 0)
 854                         printf(" log logamount %d", logptr->max_log);
 855                 else
 856                         printf(" log");
 857         }
 858         /*
 859          * then print the body
 860          */
 861         for (l = rule->act_ofs, cmd = rule->cmd ;
 862                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
 863                 /* useful alias */
 864                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
 865
 866                 switch(cmd->opcode) {
 867                 case O_PROBE_STATE:
 868                         break; /* no need to print anything here */
 869
 870                 case O_MACADDR2: {
 871                         ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
 872                         if ( (flags & HAVE_MAC) == 0)
 873                                 printf(" MAC");
 874                         flags |= HAVE_MAC;
 875                         if (cmd->len & F_NOT)
 876                                 printf(" not");
 877                         print_mac( m->addr, m->mask);
 878                         print_mac( m->addr + 6, m->mask + 6);
 879                         }
 880                         break;
 881
 882                 case O_MAC_TYPE:
 883                         print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE);
 884                         break;
 885
 886                 case O_IP_SRC:
 887                 case O_IP_SRC_MASK:
 888                 case O_IP_SRC_ME:
 889                 case O_IP_SRC_SET:
 890                         show_prerequisites(&flags, HAVE_PROTO);
 891                         if (!(flags & HAVE_SRCIP))
 892                                 printf(" from");
 893                         if ((cmd->len & F_OR) && !or_block)
 894                                 printf(" {");
 895                         print_ip((ipfw_insn_ip *)cmd);
 896                         flags |= HAVE_SRCIP;
 897                         break;
 898
 899                 case O_IP_DST:
 900                 case O_IP_DST_MASK:
 901                 case O_IP_DST_ME:
 902                 case O_IP_DST_SET:
 903                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP);
 904                         if (!(flags & HAVE_DSTIP))
 905                                 printf(" to");
 906                         if ((cmd->len & F_OR) && !or_block)
 907                                 printf(" {");
 908                         print_ip((ipfw_insn_ip *)cmd);
 909                         flags |= HAVE_DSTIP;
 910                         break;
 911
 912                 case O_IP_DSTPORT:
 913                         show_prerequisites(&flags,
 914                                 HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
 915                 case O_IP_SRCPORT:
 916                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP);
 917                         print_newports((ipfw_insn_u16 *)cmd, proto);
 918                         break;
 919
 920                 case O_PROTO: {
 921                         struct protoent *pe;
 922
 923                         if ((cmd->len & F_OR) && !or_block)
 924                                 printf(" {");
 925                         if (cmd->len & F_NOT)
 926                                 printf(" not");
 927                         proto = cmd->arg1;
 928                         pe = getprotobynumber(cmd->arg1);
 929                         if (pe)
 930                                 printf(" %s", pe->p_name);
 931                         else
 932                                 printf(" %u", cmd->arg1);
 933                         }
 934                         flags |= HAVE_PROTO;
 935                         break;
 936
 937                 default: /*options ... */
 938                         show_prerequisites(&flags,
 939                             HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
 940                         if ((cmd->len & F_OR) && !or_block)
 941                                 printf(" {");
 942                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
 943                                 printf(" not");
 944                         switch(cmd->opcode) {
 945                         case O_FRAG:
 946                                 printf(" frag");
 947                                 break;
 948
 949                         case O_IN:
 950                                 printf(cmd->len & F_NOT ? " out" : " in");
 951                                 break;
 952
 953                         case O_LAYER2:
 954                                 printf(" layer2");
 955                                 break;
 956                         case O_XMIT:
 957                         case O_RECV:
 958                         case O_VIA: {
 959                                 char *s;
 960                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
 961
 962                                 if (cmd->opcode == O_XMIT)
 963                                         s = "xmit";
 964                                 else if (cmd->opcode == O_RECV)
 965                                         s = "recv";
 966                                 else if (cmd->opcode == O_VIA)
 967                                         s = "via";
 968                                 if (cmdif->name[0] == '\0')
 969                                         printf(" %s %s", s,
 970                                             inet_ntoa(cmdif->p.ip));
 971                                 else if (cmdif->p.unit == -1)
 972                                         printf(" %s %s*", s, cmdif->name);
 973                                 else
 974                                         printf(" %s %s%d", s, cmdif->name,
 975                                             cmdif->p.unit);
 976                                 }
 977                                 break;
 978
 979                         case O_IPID:
 980                                 printf(" ipid %u", cmd->arg1 );
 981                                 break;
 982
 983                         case O_IPTTL:
 984                                 printf(" ipttl %u", cmd->arg1 );
 985                                 break;
 986
 987                         case O_IPVER:
 988                                 printf(" ipver %u", cmd->arg1 );
 989                                 break;
 990
 991                         case O_IPPRECEDENCE:
 992                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
 993                                 break;
 994
 995                         case O_IPLEN:
 996                                 printf(" iplen %u", cmd->arg1 );
 997                                 break;
 998
 999                         case O_IPOPTS:
1000                                 print_flags("ipoptions", cmd, f_ipopts);
1001                                 break;
1002
1003                         case O_IPTOS:
1004                                 print_flags("iptos", cmd, f_iptos);
1005                                 break;
1006
1007                         case O_ICMPTYPE:
1008                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1009                                 break;
1010
1011                         case O_ESTAB:
1012                                 printf(" established");
1013                                 break;
1014
1015                         case O_TCPFLAGS:
1016                                 print_flags("tcpflags", cmd, f_tcpflags);
1017                                 break;
1018
1019                         case O_TCPOPTS:
1020                                 print_flags("tcpoptions", cmd, f_tcpopts);
1021                                 break;
1022
1023                         case O_TCPWIN:
1024                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1025                                 break;
1026
1027                         case O_TCPACK:
1028                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1029                                 break;
1030
1031                         case O_TCPSEQ:
1032                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1033                                 break;
1034
1035                         case O_UID:
1036                             {
1037                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1038
1039                                 if (pwd)
1040                                         printf(" uid %s", pwd->pw_name);
1041                                 else
1042                                         printf(" uid %u", cmd32->d[0]);
1043                             }
1044                                 break;
1045
1046                         case O_GID:
1047                             {
1048                                 struct group *grp = getgrgid(cmd32->d[0]);
1049
1050                                 if (grp)
1051                                         printf(" gid %s", grp->gr_name);
1052                                 else
1053                                         printf(" gid %u", cmd32->d[0]);
1054                             }
1055                                 break;
1056
1057                         case O_KEEP_STATE:
1058                                 printf(" keep-state");
1059                                 break;
1060
1061                         case O_LIMIT:
1062                             {
1063                                 struct _s_x *p = limit_masks;
1064                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1065                                 u_int8_t x = c->limit_mask;
1066                                 char *comma = " ";
1067
1068                                 printf(" limit");
1069                                 for ( ; p->x != 0 ; p++)
1070                                         if ((x & p->x) == p->x) {
1071                                                 x &= ~p->x;
1072                                                 printf("%s%s", comma, p->s);
1073                                                 comma = ",";
1074                                         }
1075                                 printf(" %d", c->conn_limit);
1076                             }
1077                                 break;
1078
1079                         default:
1080                                 printf(" [opcode %d len %d]",
1081                                     cmd->opcode, cmd->len);
1082                         }
1083                 }
1084                 if (cmd->len & F_OR) {
1085                         printf(" or");
1086                         or_block = 1;
1087                 } else if (or_block) {
1088                         printf(" }");
1089                         or_block = 0;
1090                 }
1091         }
1092         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
1093
1094         printf("\n");
1095 }
1096
1097 static void
1098 show_dyn_ipfw(ipfw_dyn_rule *d)
1099 {
1100         struct protoent *pe;
1101         struct in_addr a;
1102
1103         if (!do_expired) {
1104                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1105                         return;
1106         }
1107
1108         printf("%05d %10qu %10qu (%ds)",
1109             (int)(d->rule), d->pcnt, d->bcnt, d->expire);
1110         switch (d->dyn_type) {
1111         case O_LIMIT_PARENT:
1112                 printf(" PARENT %d", d->count);
1113                 break;
1114         case O_LIMIT:
1115                 printf(" LIMIT");
1116                 break;
1117         case O_KEEP_STATE: /* bidir, no mask */
1118                 printf(" STATE");
1119                 break;
1120         }
1121
1122         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1123                 printf(" %s", pe->p_name);
1124         else
1125                 printf(" proto %u", d->id.proto);
1126
1127         a.s_addr = htonl(d->id.src_ip);
1128         printf(" %s %d", inet_ntoa(a), d->id.src_port);
1129
1130         a.s_addr = htonl(d->id.dst_ip);
1131         printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1132         printf("\n");
1133 }
1134
1135 int
1136 sort_q(const void *pa, const void *pb)
1137 {
1138         int rev = (do_sort < 0);
1139         int field = rev ? -do_sort : do_sort;
1140         long long res = 0;
1141         const struct dn_flow_queue *a = pa;
1142         const struct dn_flow_queue *b = pb;
1143
1144         switch (field) {
1145         case 1: /* pkts */
1146                 res = a->len - b->len;
1147                 break;
1148         case 2: /* bytes */
1149                 res = a->len_bytes - b->len_bytes;
1150                 break;
1151
1152         case 3: /* tot pkts */
1153                 res = a->tot_pkts - b->tot_pkts;
1154                 break;
1155
1156         case 4: /* tot bytes */
1157                 res = a->tot_bytes - b->tot_bytes;
1158                 break;
1159         }
1160         if (res < 0)
1161                 res = -1;
1162         if (res > 0)
1163                 res = 1;
1164         return (int)(rev ? res : -res);
1165 }
1166
1167 static void
1168 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
1169 {
1170         int l;
1171
1172         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1173             fs->flow_mask.proto,
1174             fs->flow_mask.src_ip, fs->flow_mask.src_port,
1175             fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
1176         if (fs->rq_elements == 0)
1177                 return;
1178
1179         printf("BKT Prot ___Source IP/port____ "
1180             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1181         if (do_sort != 0)
1182                 heapsort(q, fs->rq_elements, sizeof *q, sort_q);
1183         for (l = 0; l < fs->rq_elements; l++) {
1184                 struct in_addr ina;
1185                 struct protoent *pe;
1186
1187                 ina.s_addr = htonl(q[l].id.src_ip);
1188                 printf("%3d ", q[l].hash_slot);
1189                 pe = getprotobynumber(q[l].id.proto);
1190                 if (pe)
1191                         printf("%-4s ", pe->p_name);
1192                 else
1193                         printf("%4u ", q[l].id.proto);
1194                 printf("%15s/%-5d ",
1195                     inet_ntoa(ina), q[l].id.src_port);
1196                 ina.s_addr = htonl(q[l].id.dst_ip);
1197                 printf("%15s/%-5d ",
1198                     inet_ntoa(ina), q[l].id.dst_port);
1199                 printf("%4qu %8qu %2u %4u %3u\n",
1200                     q[l].tot_pkts, q[l].tot_bytes,
1201                     q[l].len, q[l].len_bytes, q[l].drops);
1202                 if (verbose)
1203                         printf("   S %20qd  F %20qd\n",
1204                             q[l].S, q[l].F);
1205         }
1206 }
1207
1208 static void
1209 print_flowset_parms(struct dn_flow_set *fs, char *prefix)
1210 {
1211         int l;
1212         char qs[30];
1213         char plr[30];
1214         char red[90];   /* Display RED parameters */
1215
1216         l = fs->qsize;
1217         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1218                 if (l >= 8192)
1219                         sprintf(qs, "%d KB", l / 1024);
1220                 else
1221                         sprintf(qs, "%d B", l);
1222         } else
1223                 sprintf(qs, "%3d sl.", l);
1224         if (fs->plr)
1225                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1226         else
1227                 plr[0] = '\0';
1228         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1229                 sprintf(red,
1230                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1231                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1232                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1233                     SCALE_VAL(fs->min_th),
1234                     SCALE_VAL(fs->max_th),
1235                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1236         else
1237                 sprintf(red, "droptail");
1238
1239         printf("%s %s%s %d queues (%d buckets) %s\n",
1240             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1241 }
1242
1243 static void
1244 list_pipes(void *data, int nbytes, int ac, char *av[])
1245 {
1246         u_long rulenum;
1247         void *next = data;
1248         struct dn_pipe *p = (struct dn_pipe *) data;
1249         struct dn_flow_set *fs;
1250         struct dn_flow_queue *q;
1251         int l;
1252
1253         if (ac > 0)
1254                 rulenum = strtoul(*av++, NULL, 10);
1255         else
1256                 rulenum = 0;
1257         for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
1258                 double b = p->bandwidth;
1259                 char buf[30];
1260                 char prefix[80];
1261
1262                 if (p->next != (struct dn_pipe *)DN_IS_PIPE)
1263                         break;  /* done with pipes, now queues */
1264
1265                 /*
1266                  * compute length, as pipe have variable size
1267                  */
1268                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1269                 next = (void *)p + l;
1270                 nbytes -= l;
1271
1272                 if (rulenum != 0 && rulenum != p->pipe_nr)
1273                         continue;
1274
1275                 /*
1276                  * Print rate (or clocking interface)
1277                  */
1278                 if (p->if_name[0] != '\0')
1279                         sprintf(buf, "%s", p->if_name);
1280                 else if (b == 0)
1281                         sprintf(buf, "unlimited");
1282                 else if (b >= 1000000)
1283                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1284                 else if (b >= 1000)
1285                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1286                 else
1287                         sprintf(buf, "%7.3f bit/s ", b);
1288
1289                 sprintf(prefix, "%05d: %s %4d ms ",
1290                     p->pipe_nr, buf, p->delay);
1291                 print_flowset_parms(&(p->fs), prefix);
1292                 if (verbose)
1293                         printf("   V %20qd\n", p->V >> MY_M);
1294
1295                 q = (struct dn_flow_queue *)(p+1);
1296                 list_queues(&(p->fs), q);
1297         }
1298         for (fs = next; nbytes >= sizeof *fs; fs = next) {
1299                 char prefix[80];
1300
1301                 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
1302                         break;
1303                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1304                 next = (void *)fs + l;
1305                 nbytes -= l;
1306                 q = (struct dn_flow_queue *)(fs+1);
1307                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1308                     fs->fs_nr, fs->weight, fs->parent_nr);
1309                 print_flowset_parms(fs, prefix);
1310                 list_queues(fs, q);
1311         }
1312 }
1313
1314 static void
1315 list(int ac, char *av[])
1316 {
1317         struct ip_fw *r;
1318         ipfw_dyn_rule *dynrules, *d;
1319
1320         void *lim, *data = NULL;
1321         int n, nbytes, nstat, ndyn;
1322         int exitval = EX_OK;
1323         int lac;
1324         char **lav;
1325         u_long rnum;
1326         char *endptr;
1327         int seen = 0;
1328
1329         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1330         int nalloc = 1024;      /* start somewhere... */
1331
1332         ac--;
1333         av++;
1334
1335         /* get rules or pipes from kernel, resizing array as necessary */
1336         nbytes = nalloc;
1337
1338         while (nbytes >= nalloc) {
1339                 nalloc = nalloc * 2 + 200;
1340                 nbytes = nalloc;
1341                 if ((data = realloc(data, nbytes)) == NULL)
1342                         err(EX_OSERR, "realloc");
1343                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1344                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1345                                 do_pipe ? "DUMMYNET" : "FW");
1346         }
1347
1348         if (do_pipe) {
1349                 list_pipes(data, nbytes, ac, av);
1350                 goto done;
1351         }
1352
1353         /*
1354          * Count static rules. They have variable size so we
1355          * need to scan the list to count them.
1356          */
1357         for (nstat = 1, r = data, lim = data + nbytes;
1358                     r->rulenum < 65535 && (void *)r < lim;
1359                     ++nstat, r = (void *)r + RULESIZE(r) )
1360                 ; /* nothing */
1361
1362         /*
1363          * Count dynamic rules. This is easier as they have
1364          * fixed size.
1365          */
1366         r = (void *)r + RULESIZE(r);
1367         dynrules = (ipfw_dyn_rule *)r ;
1368         n = (void *)r - data;
1369         ndyn = (nbytes - n) / sizeof *dynrules;
1370
1371         /* if no rule numbers were specified, list all rules */
1372         if (ac == 0) {
1373                 for (n = 0, r = data; n < nstat;
1374                     n++, r = (void *)r + RULESIZE(r) )
1375                         show_ipfw(r);
1376
1377                 if (do_dynamic && ndyn) {
1378                         printf("## Dynamic rules (%d):\n", ndyn);
1379                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1380                                 show_dyn_ipfw(d);
1381                 }
1382                 goto done;
1383         }
1384
1385         /* display specific rules requested on command line */
1386
1387         for (lac = ac, lav = av; lac != 0; lac--) {
1388                 /* convert command line rule # */
1389                 rnum = strtoul(*lav++, &endptr, 10);
1390                 if (*endptr) {
1391                         exitval = EX_USAGE;
1392                         warnx("invalid rule number: %s", *(lav - 1));
1393                         continue;
1394                 }
1395                 for (n = seen = 0, r = data; n < nstat;
1396                     n++, r = (void *)r + RULESIZE(r) ) {
1397                         if (r->rulenum > rnum)
1398                                 break;
1399                         if (r->rulenum == rnum) {
1400                                 show_ipfw(r);
1401                                 seen = 1;
1402                         }
1403                 }
1404                 if (!seen) {
1405                         /* give precedence to other error(s) */
1406                         if (exitval == EX_OK)
1407                                 exitval = EX_UNAVAILABLE;
1408                         warnx("rule %lu does not exist", rnum);
1409                 }
1410         }
1411
1412         if (do_dynamic && ndyn) {
1413                 printf("## Dynamic rules:\n");
1414                 for (lac = ac, lav = av; lac != 0; lac--) {
1415                         rnum = strtoul(*lav++, &endptr, 10);
1416                         if (*endptr)
1417                                 /* already warned */
1418                                 continue;
1419                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1420                                 if ((int)(d->rule) > rnum)
1421                                         break;
1422                                 if ((int)(d->rule) == rnum)
1423                                         show_dyn_ipfw(d);
1424                         }
1425                 }
1426         }
1427
1428         ac = 0;
1429
1430 done:
1431         free(data);
1432
1433         if (exitval != EX_OK)
1434                 exit(exitval);
1435 }
1436
1437 static void
1438 show_usage(void)
1439 {
1440         fprintf(stderr, "usage: ipfw [options]\n"
1441 "    add [number] rule\n"
1442 "    pipe number config [pipeconfig]\n"
1443 "    queue number config [queueconfig]\n"
1444 "    [pipe] flush\n"
1445 "    [pipe] delete number ...\n"
1446 "    [pipe] {list|show} [number ...]\n"
1447 "    {zero|resetlog} [number ...]\n"
1448 "do \"ipfw -h\" or see ipfw manpage for details\n"
1449 );
1450
1451         exit(EX_USAGE);
1452 }
1453
1454 static void
1455 help(void)
1456 {
1457
1458         fprintf(stderr, "ipfw syntax summary:\n"
1459 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1460 "ipfw {pipe|queue} N config BODY\n"
1461 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1462 "\n"
1463 "RULE:          [1..] [PROB] BODY\n"
1464 "RULENUM:       INTEGER(1..65534)\n"
1465 "PROB:          prob REAL(0..1)\n"
1466 "BODY:          check-state [LOG] (no body) |\n"
1467 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1468 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1469 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1470 "ADDR:          [ MAC dst src ether_type ] \n"
1471 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1472 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1473 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1474 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1475 );
1476 exit(0);
1477 }
1478
1479
1480 static int
1481 lookup_host (char *host, struct in_addr *ipaddr)
1482 {
1483         struct hostent *he;
1484
1485         if (!inet_aton(host, ipaddr)) {
1486                 if ((he = gethostbyname(host)) == NULL)
1487                         return(-1);
1488                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1489         }
1490         return(0);
1491 }
1492
1493 /*
1494  * fills the addr and mask fields in the instruction as appropriate from av.
1495  * Update length as appropriate.
1496  * The following formats are allowed:
1497  *      any     matches any IP. Actually returns an empty instruction.
1498  *      me      returns O_IP_*_ME
1499  *      1.2.3.4         single IP address
1500  *      1.2.3.4:5.6.7.8 address:mask
1501  *      1.2.3.4/24      address/mask
1502  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1503  */
1504 static void
1505 fill_ip(ipfw_insn_ip *cmd, char *av)
1506 {
1507         char *p = 0, md = 0;
1508         u_int32_t i;
1509
1510         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1511
1512         if (!strncmp(av, "any", strlen(av)))
1513                 return;
1514
1515         if (!strncmp(av, "me", strlen(av))) {
1516                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1517                 return;
1518         }
1519
1520         p = strchr(av, '/');
1521         if (!p)
1522                 p = strchr(av, ':');
1523         if (p) {
1524                 md = *p;
1525                 *p++ = '\0';
1526         }
1527
1528         if (lookup_host(av, &cmd->addr) != 0)
1529                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1530         switch (md) {
1531         case ':':
1532                 if (!inet_aton(p, &cmd->mask))
1533                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1534                 break;
1535         case '/':
1536                 i = atoi(p);
1537                 if (i == 0)
1538                         cmd->mask.s_addr = htonl(0);
1539                 else if (i > 32)
1540                         errx(EX_DATAERR, "bad width ``%s''", p);
1541                 else
1542                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1543                 break;
1544         default:
1545                 cmd->mask.s_addr = htonl(~0);
1546                 break;
1547         }
1548         cmd->addr.s_addr &= cmd->mask.s_addr;
1549         /*
1550          * now look if we have a set of addresses. They are stored as follows:
1551          *   arg1       is the set size (powers of 2, 2..256)
1552          *   addr       is the base address IN HOST FORMAT
1553          *   mask..     is an array of u_int32_t with bits set.
1554          */
1555         if (p)
1556                 p = strchr(p, '{');
1557         if (p) {        /* fetch addresses */
1558                 u_int32_t *d;
1559                 int low, high;
1560                 int i = contigmask((u_char *)&(cmd->mask), 32);
1561
1562                 if (i < 24 || i > 31) {
1563                         fprintf(stderr, "invalid set with mask %d\n",
1564                                 i);
1565                         exit(0);
1566                 }
1567                 cmd->o.arg1 = 1<<(32-i);
1568                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1569                 d = (u_int32_t *)&cmd->mask;
1570                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1571                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1572                 fprintf(stderr,"-- set size %d cmdlen %d\n",
1573                         cmd->o.arg1, cmd->o.len );
1574                 for (i = 0; i < cmd->o.arg1/32 ; i++)
1575                         d[i] = 0;       /* clear masks */
1576
1577                 av = p+1;
1578                 low = cmd->addr.s_addr & 0xff;
1579                 high = low + cmd->o.arg1 - 1;
1580                 while (isdigit(*av)) {
1581                         char *s;
1582                         u_int16_t a = strtol(av, &s, 0);
1583
1584                         if (s == av) /* no parameter */
1585                                 break;
1586                         if (a < low || a > high) {
1587                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1588                                 a, low, high);
1589                             exit(0);
1590                         }
1591                         a -= low;
1592                         d[ a/32] |= 1<<(a & 31);
1593                         if (*s != ',')
1594                                 break;
1595                         av = s+1;
1596                 }
1597                 return;
1598         }
1599
1600         if (cmd->mask.s_addr == 0) { /* any */
1601                 if (cmd->o.len & F_NOT)
1602                         errx(EX_DATAERR, "not any never matches");
1603                 else    /* useless, nuke it */
1604                         return;
1605         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1606                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1607         else                                            /* addr/mask */
1608                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1609 }
1610
1611
1612 /*
1613  * helper function to process a set of flags and set bits in the
1614  * appropriate masks.
1615  */
1616 static void
1617 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1618         struct _s_x *flags, char *p)
1619 {
1620         u_int8_t set=0, clear=0;
1621
1622         while (p && *p) {
1623                 char *q;        /* points to the separator */
1624                 int val;
1625                 u_int8_t *which;        /* mask we are working on */
1626
1627                 if (*p == '!') {
1628                         p++;
1629                         which = &clear;
1630                 } else
1631                         which = &set;
1632                 q = strchr(p, ',');
1633                 if (q)
1634                         *q++ = '\0';
1635                 val = match_token(flags, p);
1636                 if (val <= 0)
1637                         errx(EX_DATAERR, "invalid flag %s", p);
1638                 *which |= (u_int8_t)val;
1639                 p = q;
1640         }
1641         cmd->opcode = opcode;
1642         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1643         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1644 }
1645
1646
1647 static void
1648 delete(int ac, char *av[])
1649 {
1650         int rulenum;
1651         struct dn_pipe pipe;
1652         int i;
1653         int exitval = EX_OK;
1654
1655         memset(&pipe, 0, sizeof pipe);
1656
1657         av++; ac--;
1658
1659         /* Rule number */
1660         while (ac && isdigit(**av)) {
1661                 i = atoi(*av); av++; ac--;
1662                 if (do_pipe) {
1663                         if (do_pipe == 1)
1664                                 pipe.pipe_nr = i;
1665                         else
1666                                 pipe.fs.fs_nr = i;
1667                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1668                             &pipe, sizeof pipe);
1669                         if (i) {
1670                                 exitval = 1;
1671                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1672                                     do_pipe == 1 ? pipe.pipe_nr :
1673                                     pipe.fs.fs_nr);
1674                         }
1675                 } else {
1676                         rulenum = i;
1677                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1678                             sizeof rulenum);
1679                         if (i) {
1680                                 exitval = EX_UNAVAILABLE;
1681                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1682                                     rulenum);
1683                         }
1684                 }
1685         }
1686         if (exitval != EX_OK)
1687                 exit(exitval);
1688 }
1689
1690
1691 /*
1692  * fill the interface structure. We do not check the name as we can
1693  * create interfaces dynamically, so checking them at insert time
1694  * makes relatively little sense.
1695  * A '*' following the name means any unit.
1696  */
1697 static void
1698 fill_iface(ipfw_insn_if *cmd, char *arg)
1699 {
1700         cmd->name[0] = '\0';
1701         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1702
1703         /* Parse the interface or address */
1704         if (!strcmp(arg, "any"))
1705                 cmd->o.len = 0;         /* effectively ignore this command */
1706         else if (!isdigit(*arg)) {
1707                 char *q;
1708
1709                 strncpy(cmd->name, arg, sizeof(cmd->name));
1710                 cmd->name[sizeof(cmd->name) - 1] = '\0';
1711                 /* find first digit or wildcard */
1712                 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++)
1713                         continue;
1714                 cmd->p.unit = (*q == '*') ? -1 : atoi(q);
1715                 *q = '\0';
1716         } else if (!inet_aton(arg, &cmd->p.ip))
1717                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1718 }
1719
1720 /*
1721  * the following macro returns an error message if we run out of
1722  * arguments.
1723  */
1724 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
1725
1726 static void
1727 config_pipe(int ac, char **av)
1728 {
1729         struct dn_pipe pipe;
1730         int i;
1731         char *end;
1732         u_int32_t a;
1733         void *par = NULL;
1734
1735         memset(&pipe, 0, sizeof pipe);
1736
1737         av++; ac--;
1738         /* Pipe number */
1739         if (ac && isdigit(**av)) {
1740                 i = atoi(*av); av++; ac--;
1741                 if (do_pipe == 1)
1742                         pipe.pipe_nr = i;
1743                 else
1744                         pipe.fs.fs_nr = i;
1745         }
1746         while (ac > 0) {
1747                 double d;
1748                 int tok = match_token(dummynet_params, *av);
1749                 ac--; av++;
1750
1751                 switch(tok) {
1752                 case TOK_PLR:
1753                         NEED1("plr needs argument 0..1\n");
1754                         d = strtod(av[0], NULL);
1755                         if (d > 1)
1756                                 d = 1;
1757                         else if (d < 0)
1758                                 d = 0;
1759                         pipe.fs.plr = (int)(d*0x7fffffff);
1760                         ac--; av++;
1761                         break;
1762
1763                 case TOK_QUEUE:
1764                         NEED1("queue needs queue size\n");
1765                         end = NULL;
1766                         pipe.fs.qsize = strtoul(av[0], &end, 0);
1767                         if (*end == 'K' || *end == 'k') {
1768                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
1769                                 pipe.fs.qsize *= 1024;
1770                         } else if (*end == 'B' || !strncmp(end, "by", 2)) {
1771                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
1772                         }
1773                         ac--; av++;
1774                         break;
1775
1776                 case TOK_BUCKETS:
1777                         NEED1("buckets needs argument\n");
1778                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
1779                         ac--; av++;
1780                         break;
1781
1782                 case TOK_MASK:
1783                         NEED1("mask needs mask specifier\n");
1784                         /*
1785                          * per-flow queue, mask is dst_ip, dst_port,
1786                          * src_ip, src_port, proto measured in bits
1787                          */
1788                         par = NULL;
1789
1790                         pipe.fs.flow_mask.dst_ip = 0;
1791                         pipe.fs.flow_mask.src_ip = 0;
1792                         pipe.fs.flow_mask.dst_port = 0;
1793                         pipe.fs.flow_mask.src_port = 0;
1794                         pipe.fs.flow_mask.proto = 0;
1795                         end = NULL;
1796
1797                         while (ac >= 1) {
1798                             u_int32_t *p32 = NULL;
1799                             u_int16_t *p16 = NULL;
1800
1801                             tok = match_token(dummynet_params, *av);
1802                             ac--; av++;
1803                             switch(tok) {
1804                             case TOK_ALL:
1805                                     /*
1806                                      * special case, all bits significant
1807                                      */
1808                                     pipe.fs.flow_mask.dst_ip = ~0;
1809                                     pipe.fs.flow_mask.src_ip = ~0;
1810                                     pipe.fs.flow_mask.dst_port = ~0;
1811                                     pipe.fs.flow_mask.src_port = ~0;
1812                                     pipe.fs.flow_mask.proto = ~0;
1813                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
1814                                     goto end_mask;
1815
1816                             case TOK_DSTIP:
1817                                     p32 = &pipe.fs.flow_mask.dst_ip;
1818                                     break;
1819
1820                             case TOK_SRCIP:
1821                                     p32 = &pipe.fs.flow_mask.src_ip;
1822                                     break;
1823
1824                             case TOK_DSTPORT:
1825                                     p16 = &pipe.fs.flow_mask.dst_port;
1826                                     break;
1827
1828                             case TOK_SRCPORT:
1829                                     p16 = &pipe.fs.flow_mask.src_port;
1830                                     break;
1831
1832                             case TOK_PROTO:
1833                                     break;
1834
1835                             default:
1836                                     ac++; av--; /* backtrack */
1837                                     goto end_mask;
1838                             }
1839                             if (ac < 1)
1840                                     errx(EX_USAGE, "mask: value missing");
1841                             if (*av[0] == '/') {
1842                                     a = strtoul(av[0]+1, &end, 0);
1843                                     a = (a == 32) ? ~0 : (1 << a) - 1;
1844                             } else
1845                                     a = strtoul(av[0], &end, 0);
1846                             if (p32 != NULL)
1847                                     *p32 = a;
1848                             else if (p16 != NULL) {
1849                                     if (a > 65535)
1850                                             errx(EX_DATAERR,
1851                                                 "mask: must be 16 bit");
1852                                     *p16 = (u_int16_t)a;
1853                             } else {
1854                                     if (a > 255)
1855                                             errx(EX_DATAERR,
1856                                                 "mask: must be 8 bit");
1857                                     pipe.fs.flow_mask.proto = (u_int8_t)a;
1858                             }
1859                             if (a != 0)
1860                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
1861                             ac--; av++;
1862                         } /* end while, config masks */
1863 end_mask:
1864                         break;
1865
1866                 case TOK_RED:
1867                 case TOK_GRED:
1868                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
1869                         pipe.fs.flags_fs |= DN_IS_RED;
1870                         if (tok == TOK_GRED)
1871                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
1872                         /*
1873                          * the format for parameters is w_q/min_th/max_th/max_p
1874                          */
1875                         if ((end = strsep(&av[0], "/"))) {
1876                             double w_q = strtod(end, NULL);
1877                             if (w_q > 1 || w_q <= 0)
1878                                 errx(EX_DATAERR, "0 < w_q <= 1");
1879                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
1880                         }
1881                         if ((end = strsep(&av[0], "/"))) {
1882                             pipe.fs.min_th = strtoul(end, &end, 0);
1883                             if (*end == 'K' || *end == 'k')
1884                                 pipe.fs.min_th *= 1024;
1885                         }
1886                         if ((end = strsep(&av[0], "/"))) {
1887                             pipe.fs.max_th = strtoul(end, &end, 0);
1888                             if (*end == 'K' || *end == 'k')
1889                                 pipe.fs.max_th *= 1024;
1890                         }
1891                         if ((end = strsep(&av[0], "/"))) {
1892                             double max_p = strtod(end, NULL);
1893                             if (max_p > 1 || max_p <= 0)
1894                                 errx(EX_DATAERR, "0 < max_p <= 1");
1895                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
1896                         }
1897                         ac--; av++;
1898                         break;
1899
1900                 case TOK_DROPTAIL:
1901                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
1902                         break;
1903
1904                 case TOK_BW:
1905                         NEED1("bw needs bandwidth or interface\n");
1906                         if (do_pipe != 1)
1907                             errx(EX_DATAERR, "bandwidth only valid for pipes");
1908                         /*
1909                          * set clocking interface or bandwidth value
1910                          */
1911                         if (av[0][0] >= 'a' && av[0][0] <= 'z') {
1912                             int l = sizeof(pipe.if_name)-1;
1913                             /* interface name */
1914                             strncpy(pipe.if_name, av[0], l);
1915                             pipe.if_name[l] = '\0';
1916                             pipe.bandwidth = 0;
1917                         } else {
1918                             pipe.if_name[0] = '\0';
1919                             pipe.bandwidth = strtoul(av[0], &end, 0);
1920                             if (*end == 'K' || *end == 'k') {
1921                                 end++;
1922                                 pipe.bandwidth *= 1000;
1923                             } else if (*end == 'M') {
1924                                 end++;
1925                                 pipe.bandwidth *= 1000000;
1926                             }
1927                             if (*end == 'B' || !strncmp(end, "by", 2))
1928                                 pipe.bandwidth *= 8;
1929                             if (pipe.bandwidth < 0)
1930                                 errx(EX_DATAERR, "bandwidth too large");
1931                         }
1932                         ac--; av++;
1933                         break;
1934
1935                 case TOK_DELAY:
1936                         if (do_pipe != 1)
1937                                 errx(EX_DATAERR, "delay only valid for pipes");
1938                         NEED1("delay needs argument 0..10000ms\n");
1939                         pipe.delay = strtoul(av[0], NULL, 0);
1940                         ac--; av++;
1941                         break;
1942
1943                 case TOK_WEIGHT:
1944                         if (do_pipe == 1)
1945                                 errx(EX_DATAERR,"weight only valid for queues");
1946                         NEED1("weight needs argument 0..100\n");
1947                         pipe.fs.weight = strtoul(av[0], &end, 0);
1948                         ac--; av++;
1949                         break;
1950
1951                 case TOK_PIPE:
1952                         if (do_pipe == 1)
1953                                 errx(EX_DATAERR,"pipe only valid for queues");
1954                         NEED1("pipe needs pipe_number\n");
1955                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
1956                         ac--; av++;
1957                         break;
1958
1959                 default:
1960                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
1961                 }
1962         }
1963         if (do_pipe == 1) {
1964                 if (pipe.pipe_nr == 0)
1965                         errx(EX_DATAERR, "pipe_nr must be > 0");
1966                 if (pipe.delay > 10000)
1967                         errx(EX_DATAERR, "delay must be < 10000");
1968         } else { /* do_pipe == 2, queue */
1969                 if (pipe.fs.parent_nr == 0)
1970                         errx(EX_DATAERR, "pipe must be > 0");
1971                 if (pipe.fs.weight >100)
1972                         errx(EX_DATAERR, "weight must be <= 100");
1973         }
1974         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
1975                 if (pipe.fs.qsize > 1024*1024)
1976                         errx(EX_DATAERR, "queue size must be < 1MB");
1977         } else {
1978                 if (pipe.fs.qsize > 100)
1979                         errx(EX_DATAERR, "2 <= queue size <= 100");
1980         }
1981         if (pipe.fs.flags_fs & DN_IS_RED) {
1982                 size_t len;
1983                 int lookup_depth, avg_pkt_size;
1984                 double s, idle, weight, w_q;
1985                 struct clockinfo clock;
1986                 int t;
1987
1988                 if (pipe.fs.min_th >= pipe.fs.max_th)
1989                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
1990                         pipe.fs.min_th, pipe.fs.max_th);
1991                 if (pipe.fs.max_th == 0)
1992                     errx(EX_DATAERR, "max_th must be > 0");
1993
1994                 len = sizeof(int);
1995                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
1996                         &lookup_depth, &len, NULL, 0) == -1)
1997
1998                     errx(1, "sysctlbyname(\"%s\")",
1999                         "net.inet.ip.dummynet.red_lookup_depth");
2000                 if (lookup_depth == 0)
2001                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2002                         " must be greater than zero");
2003
2004                 len = sizeof(int);
2005                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2006                         &avg_pkt_size, &len, NULL, 0) == -1)
2007
2008                     errx(1, "sysctlbyname(\"%s\")",
2009                         "net.inet.ip.dummynet.red_avg_pkt_size");
2010                 if (avg_pkt_size == 0)
2011                         errx(EX_DATAERR,
2012                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2013                             " be greater than zero");
2014
2015                 len = sizeof(struct clockinfo);
2016                 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
2017                         errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
2018
2019                 /*
2020                  * Ticks needed for sending a medium-sized packet.
2021                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2022                  * do not have bandwidth information, because that is stored
2023                  * in the parent pipe, and also we have multiple queues
2024                  * competing for it. So we set s=0, which is not very
2025                  * correct. But on the other hand, why do we want RED with
2026                  * WF2Q+ ?
2027                  */
2028                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2029                         s = 0;
2030                 else
2031                         s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
2032
2033                 /*
2034                  * max idle time (in ticks) before avg queue size becomes 0.
2035                  * NOTA:  (3/w_q) is approx the value x so that
2036                  * (1-w_q)^x < 10^-3.
2037                  */
2038                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2039                 idle = s * 3. / w_q;
2040                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2041                 if (!pipe.fs.lookup_step)
2042                         pipe.fs.lookup_step = 1;
2043                 weight = 1 - w_q;
2044                 for (t = pipe.fs.lookup_step; t > 0; --t)
2045                         weight *= weight;
2046                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2047         }
2048         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2049                             sizeof pipe);
2050         if (i)
2051                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2052 }
2053
2054 static void
2055 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2056 {
2057         int i, l;
2058
2059         for (i=0; i<6; i++)
2060                 addr[i] = mask[i] = 0;
2061         if (!strcmp(p, "any"))
2062                 return;
2063
2064         for (i=0; *p && i<6;i++, p++) {
2065                 addr[i] = strtol(p, &p, 16);
2066                 if (*p != ':') /* we start with the mask */
2067                         break;
2068         }
2069         if (*p == '/') { /* mask len */
2070                 l = strtol(p+1, &p, 0);
2071                 for (i=0; l>0; l -=8, i++)
2072                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2073         } else if (*p == '&') { /* mask */
2074                 for (i=0, p++; *p && i<6;i++, p++) {
2075                         mask[i] = strtol(p, &p, 16);
2076                         if (*p != ':')
2077                                 break;
2078                 }
2079         } else if (*p == '\0') {
2080                 for (i=0; i<6; i++)
2081                         mask[i] = 0xff;
2082         }
2083         for (i=0; i<6; i++)
2084                 addr[i] &= mask[i];
2085 }
2086
2087 /*
2088  * helper function, updates the pointer to cmd with the length
2089  * of the current command, and also cleans up the first word of
2090  * the new command in case it has been clobbered before.
2091  */
2092 static ipfw_insn *
2093 next_cmd(ipfw_insn *cmd)
2094 {
2095         cmd += F_LEN(cmd);
2096         bzero(cmd, sizeof(*cmd));
2097         return cmd;
2098 }
2099
2100 /*
2101  * A function to fill simple commands of size 1.
2102  * Existing flags are preserved.
2103  */
2104 static void
2105 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2106 {
2107         cmd->opcode = opcode;
2108         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2109         cmd->arg1 = arg;
2110 }
2111
2112 /*
2113  * Fetch and add the MAC address and type, with masks. This generates one or
2114  * two microinstructions, and returns the pointer to the last one.
2115  */
2116 static ipfw_insn *
2117 add_mac(ipfw_insn *cmd, int ac, char *av[])
2118 {
2119         ipfw_insn_mac *mac; /* also *src */
2120
2121         if (ac <3)
2122                 errx(EX_DATAERR, "MAC dst src type");
2123
2124         cmd->opcode = O_MACADDR2;
2125         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2126
2127         mac = (ipfw_insn_mac *)cmd;
2128         get_mac_addr_mask(av[0], mac->addr, mac->mask);         /* dst */
2129         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2130         av += 2;
2131
2132         if (strcmp(av[0], "any") != 0) {        /* we have a non-null port */
2133                 cmd += F_LEN(cmd);
2134
2135                 fill_newports((ipfw_insn_u16 *)cmd, av[0], IPPROTO_ETHERTYPE);
2136                 cmd->opcode = O_MAC_TYPE;
2137         }
2138
2139         return cmd;
2140 }
2141
2142 /*
2143  * Parse arguments and assemble the microinstructions which make up a rule.
2144  * Rules are added into the 'rulebuf' and then copied in the correct order
2145  * into the actual rule.
2146  *
2147  * The syntax for a rule starts with the action, followed by an
2148  * optional log action, and the various match patterns.
2149  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2150  * (generated if the rule includes a keep-state option), then the
2151  * various match patterns, the "log" action, and the actual action.
2152  *
2153  */
2154 static void
2155 add(int ac, char *av[])
2156 {
2157         /*
2158          * rules are added into the 'rulebuf' and then copied in
2159          * the correct order into the actual rule.
2160          * Some things that need to go out of order (prob, action etc.)
2161          * go into actbuf[].
2162          */
2163         static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
2164
2165         ipfw_insn *src, *dst, *cmd, *action, *prev;
2166
2167         struct ip_fw *rule;
2168
2169         /*
2170          * various flags used to record that we entered some fields.
2171          */
2172         int have_mac = 0;       /* set if we have a MAC address */
2173         int have_state = 0;     /* check-state or keep-state */
2174
2175         int i;
2176
2177         int open_par = 0;       /* open parenthesis ( */
2178
2179         /* proto is here because it is used to fetch ports */
2180         u_char proto = IPPROTO_IP;      /* default protocol */
2181
2182         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2183         bzero(cmdbuf, sizeof(cmdbuf));
2184         bzero(rulebuf, sizeof(rulebuf));
2185
2186         rule = (struct ip_fw *)rulebuf;
2187         cmd = (ipfw_insn *)cmdbuf;
2188         action = (ipfw_insn *)actbuf;
2189
2190         av++; ac--;
2191
2192         /* [rule N]     -- Rule number optional */
2193         if (ac && isdigit(**av)) {
2194                 rule->rulenum = atoi(*av);
2195                 av++;
2196                 ac--;
2197         }
2198
2199         /* [prob D]     -- match probability, optional */
2200         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2201                 double d = strtod(av[1], NULL);
2202
2203                 if (d <= 0 || d > 1)
2204                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2205                 if (d != 1) { /* 1 means always match */
2206                         action->opcode = O_PROB;
2207                         action->len = 2;
2208                         *((int32_t *)(action+1)) =
2209                                 (int32_t)((1 - d) * 0x7fffffff);
2210                         action += action->len;
2211                 }
2212                 av += 2; ac -= 2;
2213         }
2214
2215         /* action       -- mandatory */
2216         NEED1("missing action");
2217         i = match_token(rule_actions, *av);
2218         ac--; av++;
2219         action->len = 1;        /* default */
2220         switch(i) {
2221         case TOK_CHECKSTATE:
2222                 have_state = 1;
2223                 action->opcode = O_CHECK_STATE;
2224                 break;
2225
2226         case TOK_ACCEPT:
2227                 action->opcode = O_ACCEPT;
2228                 break;
2229
2230         case TOK_DENY:
2231                 action->opcode = O_DENY;
2232                 action->arg1 = 0;
2233                 break;
2234
2235         case TOK_REJECT:
2236                 action->opcode = O_REJECT;
2237                 action->arg1 = ICMP_UNREACH_HOST;
2238                 break;
2239
2240         case TOK_RESET:
2241                 action->opcode = O_REJECT;
2242                 action->arg1 = ICMP_REJECT_RST;
2243                 break;
2244
2245         case TOK_UNREACH:
2246                 action->opcode = O_REJECT;
2247                 NEED1("missing reject code");
2248                 fill_reject_code(&action->arg1, *av);
2249                 ac--; av++;
2250                 break;
2251
2252         case TOK_COUNT:
2253                 action->opcode = O_COUNT;
2254                 break;
2255
2256         case TOK_QUEUE:
2257         case TOK_PIPE:
2258                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2259         case TOK_SKIPTO:
2260                 if (i == TOK_QUEUE)
2261                         action->opcode = O_QUEUE;
2262                 else if (i == TOK_PIPE)
2263                         action->opcode = O_PIPE;
2264                 else if (i == TOK_SKIPTO)
2265                         action->opcode = O_SKIPTO;
2266                 NEED1("missing skipto/pipe/queue number");
2267                 action->arg1 = strtoul(*av, NULL, 10);
2268                 av++; ac--;
2269                 break;
2270
2271         case TOK_DIVERT:
2272         case TOK_TEE:
2273                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2274                 NEED1("missing divert/tee port");
2275                 action->arg1 = strtoul(*av, NULL, 0);
2276                 if (action->arg1 == 0) {
2277                         struct servent *s;
2278                         setservent(1);
2279                         s = getservbyname(av[0], "divert");
2280                         if (s != NULL)
2281                                 action->arg1 = ntohs(s->s_port);
2282                         else
2283                                 errx(EX_DATAERR, "illegal divert/tee port");
2284                 }
2285                 ac--; av++;
2286                 break;
2287
2288         case TOK_FORWARD: {
2289                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2290                 char *s, *end;
2291
2292                 NEED1("missing forward address[:port]");
2293
2294                 action->opcode = O_FORWARD_IP;
2295                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2296
2297                 p->sa.sin_len = sizeof(struct sockaddr_in);
2298                 p->sa.sin_family = AF_INET;
2299                 p->sa.sin_port = 0;
2300                 /*
2301                  * locate the address-port separator (':' or ',')
2302                  */
2303                 s = strchr(*av, ':');
2304                 if (s == NULL)
2305                         s = strchr(*av, ',');
2306                 if (s != NULL) {
2307                         *(s++) = '\0';
2308                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2309                         if (s == end)
2310                                 errx(EX_DATAERR,
2311                                     "illegal forwarding port ``%s''", s);
2312                         p->sa.sin_port = htons( (u_short)i );
2313                 }
2314                 lookup_host(*av, &(p->sa.sin_addr));
2315                 }
2316                 ac--; av++;
2317                 break;
2318
2319         default:
2320                 errx(EX_DATAERR, "invalid action %s\n", *av);
2321         }
2322         action = next_cmd(action);
2323
2324         /*
2325          * [log [logamount N]]  -- log, optional
2326          *
2327          * If exists, it goes first in the cmdbuf, but then it is
2328          * skipped in the copy section to the end of the buffer.
2329          */
2330         if (ac && !strncmp(*av, "log", strlen(*av))) {
2331                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2332
2333                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2334                 cmd->opcode = O_LOG;
2335                 av++; ac--;
2336                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2337                         ac--; av++;
2338                         NEED1("logamount requires argument");
2339                         c->max_log = atoi(*av);
2340                         if (c->max_log < 0)
2341                                 errx(EX_DATAERR, "logamount must be positive");
2342                         ac--; av++;
2343                 }
2344                 cmd = next_cmd(cmd);
2345         }
2346
2347         if (have_state) {
2348                 have_state = 0;
2349                 goto done;
2350         }
2351
2352 #define OR_START(target)                                        \
2353         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2354                 if (open_par)                                   \
2355                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2356                 open_par = 1;                                   \
2357                 if ( (av[0])[1] == '\0') {                      \
2358                         ac--; av++;                             \
2359                 } else                                          \
2360                         (*av)++;                                \
2361         }                                                       \
2362         target:                                                 \
2363
2364
2365 #define CLOSE_PAR                                               \
2366         if (open_par) {                                         \
2367                 if (ac && (                                     \
2368                     !strncmp(*av, ")", strlen(*av)) ||          \
2369                     !strncmp(*av, "}", strlen(*av)) )) {        \
2370                         open_par = 0;                           \
2371                         ac--; av++;                             \
2372                 } else                                          \
2373                         errx(EX_USAGE, "missing \")\"\n");      \
2374         }
2375
2376 #define NOT_BLOCK                                               \
2377         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2378                 if (cmd->len & F_NOT)                           \
2379                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2380                 cmd->len |= F_NOT;                              \
2381                 ac--; av++;                                     \
2382         }
2383
2384 #define OR_BLOCK(target)                                        \
2385         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2386                 if (prev == NULL || open_par == 0)              \
2387                         errx(EX_DATAERR, "invalid OR block");   \
2388                 prev->len |= F_OR;                              \
2389                 ac--; av++;                                     \
2390                 goto target;                                    \
2391         }                                                       \
2392         CLOSE_PAR;
2393
2394         /*
2395          * protocol, mandatory
2396          */
2397     OR_START(get_proto);
2398         NOT_BLOCK;
2399         NEED1("missing protocol");
2400         {
2401         struct protoent *pe;
2402
2403         if (!strncmp(*av, "all", strlen(*av)))
2404                 ; /* same as "ip" */
2405         else if (!strncmp(*av, "MAC", strlen(*av))) {
2406                 /* need exactly 3 fields */
2407                 cmd = add_mac(cmd, ac-1, av+1); /* exits in case of errors */
2408                 ac -= 3;
2409                 av += 3;
2410                 have_mac = 1;
2411         } else if ((proto = atoi(*av)) > 0)
2412                 ; /* all done! */
2413         else if ((pe = getprotobyname(*av)) != NULL)
2414                 proto = pe->p_proto;
2415         else
2416                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2417         av++; ac--;
2418         if (proto != IPPROTO_IP)
2419                 fill_cmd(cmd, O_PROTO, 0, proto);
2420         }
2421         cmd = next_cmd(cmd);
2422     OR_BLOCK(get_proto);
2423
2424         /*
2425          * "from", mandatory (unless we have a MAC address)
2426          */
2427         if (!ac || strncmp(*av, "from", strlen(*av))) {
2428                 if (have_mac)   /* we do not need a "to" address */
2429                         goto read_to;
2430                 errx(EX_USAGE, "missing ``from''");
2431         }
2432         ac--; av++;
2433
2434         /*
2435          * source IP, mandatory
2436          */
2437     OR_START(source_ip);
2438         NOT_BLOCK;      /* optional "not" */
2439         NEED1("missing source address");
2440
2441         /* source       -- mandatory */
2442         fill_ip((ipfw_insn_ip *)cmd, *av);
2443         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2444                 cmd->opcode = O_IP_SRC_SET;
2445         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2446                 cmd->opcode = O_IP_SRC_ME;
2447         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2448                 cmd->opcode = O_IP_SRC;
2449         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2450                 cmd->opcode = O_IP_SRC_MASK;
2451         /* otherwise len will be zero and the command skipped */
2452         ac--; av++;
2453         prev = cmd; /* in case we need to backtrack */
2454         cmd = next_cmd(cmd);
2455     OR_BLOCK(source_ip);
2456
2457         /*
2458          * source ports, optional
2459          */
2460         NOT_BLOCK;      /* optional "not" */
2461         if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
2462                 /* XXX todo: check that we have a protocol with ports */
2463                 cmd->opcode = O_IP_SRCPORT;
2464                 ac--;
2465                 av++;
2466                 cmd = next_cmd(cmd);
2467         }
2468
2469 read_to:
2470         /*
2471          * "to", mandatory (unless we have a MAC address
2472          */
2473         if (!ac || strncmp(*av, "to", strlen(*av))) {
2474                 if (have_mac)
2475                         goto read_options;
2476                 errx(EX_USAGE, "missing ``to''");
2477         }
2478         av++; ac--;
2479
2480         /*
2481          * destination, mandatory
2482          */
2483     OR_START(dest_ip);
2484         NOT_BLOCK;      /* optional "not" */
2485         NEED1("missing dst address");
2486         fill_ip((ipfw_insn_ip *)cmd, *av);
2487         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2488                 ;
2489         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2490                 cmd->opcode = O_IP_DST_ME;
2491         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2492                 cmd->opcode = O_IP_DST;
2493         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2494                 cmd->opcode = O_IP_DST_MASK;
2495         ac--;
2496         av++;
2497         prev = cmd;
2498         cmd = next_cmd(cmd);
2499     OR_BLOCK(dest_ip);
2500
2501         /*
2502          * dest. ports, optional
2503          */
2504         NOT_BLOCK;      /* optional "not" */
2505         if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
2506                 /* XXX todo: check that we have a protocol with ports */
2507                 cmd->opcode = O_IP_DSTPORT;
2508                 ac--;
2509                 av++;
2510                 cmd += F_LEN(cmd);
2511         }
2512
2513 read_options:
2514         prev = NULL;
2515         while (ac) {
2516                 char *s = *av;
2517                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;    /* alias */
2518
2519                 if (*s == '!') {        /* alternate syntax for NOT */
2520                         if (cmd->len & F_NOT)
2521                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2522                         cmd->len = F_NOT;
2523                         s++;
2524                 }
2525                 i = match_token(rule_options, s);
2526                 ac--; av++;
2527                 switch(i) {
2528                 case TOK_NOT:
2529                         if (cmd->len & F_NOT)
2530                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2531                         cmd->len = F_NOT;
2532                         break;
2533
2534                 case TOK_OR:
2535                         if (prev == NULL)
2536                                 errx(EX_USAGE, "invalid \"or\" block\n");
2537                         prev->len |= F_OR;
2538                         break;
2539
2540                 case TOK_IN:
2541                         fill_cmd(cmd, O_IN, 0, 0);
2542                         break;
2543
2544                 case TOK_OUT:
2545                         cmd->len ^= F_NOT; /* toggle F_NOT */
2546                         fill_cmd(cmd, O_IN, 0, 0);
2547                         break;
2548
2549                 case TOK_FRAG:
2550                         fill_cmd(cmd, O_FRAG, 0, 0);
2551                         break;
2552
2553                 case TOK_LAYER2:
2554                         fill_cmd(cmd, O_LAYER2, 0, 0);
2555                         break;
2556
2557                 case TOK_XMIT:
2558                 case TOK_RECV:
2559                 case TOK_VIA:
2560                         NEED1("recv, xmit, via require interface name"
2561                                 " or address");
2562                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2563                         ac--; av++;
2564                         if (F_LEN(cmd) == 0)    /* not a valid address */
2565                                 break;
2566                         if (i == TOK_XMIT)
2567                                 cmd->opcode = O_XMIT;
2568                         else if (i == TOK_RECV)
2569                                 cmd->opcode = O_RECV;
2570                         else if (i == TOK_VIA)
2571                                 cmd->opcode = O_VIA;
2572                         break;
2573
2574                 case TOK_ICMPTYPES:
2575                         NEED1("icmptypes requires list of types");
2576                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
2577                         av++; ac--;
2578                         break;
2579
2580                 case TOK_IPTTL:
2581                         NEED1("ipttl requires TTL");
2582                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2583                         ac--; av++;
2584                         break;
2585
2586                 case TOK_IPID:
2587                         NEED1("ipid requires length");
2588                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2589                         ac--; av++;
2590                         break;
2591
2592                 case TOK_IPLEN:
2593                         NEED1("iplen requires length");
2594                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2595                         ac--; av++;
2596                         break;
2597
2598                 case TOK_IPVER:
2599                         NEED1("ipver requires version");
2600                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2601                         ac--; av++;
2602                         break;
2603
2604                 case TOK_IPPRECEDENCE:
2605                         NEED1("ipprecedence requires value");
2606                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
2607                             (strtoul(*av, NULL, 0) & 7) << 5);
2608                         ac--; av++;
2609                         break;
2610
2611                 case TOK_IPOPTS:
2612                         NEED1("missing argument for ipoptions");
2613                         fill_flags(cmd, O_IPOPTS, f_ipopts, *av);
2614                         ac--; av++;
2615                         break;
2616
2617                 case TOK_IPTOS:
2618                         NEED1("missing argument for iptos");
2619                         fill_flags(cmd, O_IPOPTS, f_iptos, *av);
2620                         ac--; av++;
2621                         break;
2622
2623                 case TOK_UID:
2624                         NEED1("uid requires argument");
2625                     {
2626                         char *end;
2627                         uid_t uid;
2628                         struct passwd *pwd;
2629
2630                         cmd->opcode = O_UID;
2631                         uid = strtoul(*av, &end, 0);
2632                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
2633                         if (pwd == NULL)
2634                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
2635                         cmd32->d[0] = uid;
2636                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2637                         ac--; av++;
2638                     }
2639                         break;
2640
2641                 case TOK_GID:
2642                         NEED1("gid requires argument");
2643                     {
2644                         char *end;
2645                         gid_t gid;
2646                         struct group *grp;
2647
2648                         cmd->opcode = O_GID;
2649                         gid = strtoul(*av, &end, 0);
2650                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
2651                         if (grp == NULL)
2652                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
2653
2654                         cmd32->d[0] = gid;
2655                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2656                         ac--; av++;
2657                     }
2658                         break;
2659
2660                 case TOK_ESTAB:
2661                         fill_cmd(cmd, O_ESTAB, 0, 0);
2662                         break;
2663
2664                 case TOK_SETUP:
2665                         fill_cmd(cmd, O_TCPFLAGS, 0,
2666                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
2667                         break;
2668
2669                 case TOK_TCPOPTS:
2670                         NEED1("missing argument for tcpoptions");
2671                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
2672                         ac--; av++;
2673                         break;
2674
2675                 case TOK_TCPSEQ:
2676                 case TOK_TCPACK:
2677                         NEED1("tcpseq/tcpack requires argument");
2678                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2679                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
2680                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
2681                         ac--; av++;
2682                         break;
2683
2684                 case TOK_TCPWIN:
2685                         NEED1("tcpwin requires length");
2686                         fill_cmd(cmd, O_TCPWIN, 0,
2687                             htons(strtoul(*av, NULL, 0)));
2688                         ac--; av++;
2689                         break;
2690
2691                 case TOK_TCPFLAGS:
2692                         NEED1("missing argument for tcpflags");
2693                         cmd->opcode = O_TCPFLAGS;
2694                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
2695                         ac--; av++;
2696                         break;
2697
2698                 case TOK_KEEPSTATE:
2699                         if (have_state)
2700                                 errx(EX_USAGE, "only one of check-state "
2701                                         "and limit is allowed");
2702                         have_state = 1;
2703                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
2704                         break;
2705
2706                 case TOK_LIMIT:
2707                         NEED1("limit needs mask and # of connections");
2708                         if (have_state)
2709                                 errx(EX_USAGE, "only one of check-state "
2710                                         "and limit is allowed");
2711                     {
2712                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
2713
2714                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
2715                         cmd->opcode = O_LIMIT;
2716                         c->limit_mask = 0;
2717                         c->conn_limit = 0;
2718                         for (; ac >1 ;) {
2719                                 int val;
2720
2721                                 val = match_token(limit_masks, *av);
2722                                 if (val <= 0)
2723                                         break;
2724                                 c->limit_mask |= val;
2725                                 ac--; av++;
2726                         }
2727                         c->conn_limit = atoi(*av);
2728                         if (c->conn_limit == 0)
2729                                 errx(EX_USAGE, "limit: limit must be >0");
2730                         if (c->limit_mask == 0)
2731                                 errx(EX_USAGE, "missing limit mask");
2732                         ac--; av++;
2733                         have_state = 1;
2734                     }
2735                         break;
2736
2737                 default:
2738                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
2739                 }
2740                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
2741                         prev = cmd;
2742                         cmd = next_cmd(cmd);
2743                 }
2744         }
2745
2746 done:
2747         /*
2748          * Now copy stuff into the rule.
2749          * If we have a keep-state option, the first instruction
2750          * must be a PROBE_STATE (which is generated here).
2751          * If we have a LOG option, it was stored as the first command,
2752          * and now must be moved to the top of the action part.
2753          */
2754         dst = (ipfw_insn *)rule->cmd;
2755
2756         /*
2757          * generate O_PROBE_STATE if necessary
2758          */
2759         if (have_state) {
2760                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
2761                 dst = next_cmd(dst);
2762         }
2763         /*
2764          * copy all commands but O_LOG
2765          */
2766         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
2767                 i = F_LEN(src);
2768
2769                 if (src->opcode != O_LOG) {
2770                         bcopy(src, dst, i * sizeof(u_int32_t));
2771                         dst += i;
2772                 }
2773         }
2774
2775         /*
2776          * start action section
2777          */
2778         rule->act_ofs = dst - rule->cmd;
2779
2780         /*
2781          * put back O_LOG if necessary
2782          */
2783         src = (ipfw_insn *)cmdbuf;
2784         if ( src->opcode == O_LOG ) {
2785                 i = F_LEN(src);
2786                 bcopy(src, dst, i * sizeof(u_int32_t));
2787                 dst += i;
2788         }
2789         /*
2790          * copy all other actions
2791          */
2792         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
2793                 i = F_LEN(src);
2794                 bcopy(src, dst, i * sizeof(u_int32_t));
2795                 dst += i;
2796         }
2797
2798         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
2799         i = (void *)dst - (void *)rule;
2800         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
2801                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
2802         if (!do_quiet)
2803                 show_ipfw(rule);
2804 }
2805
2806 static void
2807 zero (int ac, char *av[])
2808 {
2809         int rulenum;
2810         int failed = EX_OK;
2811
2812         av++; ac--;
2813
2814         if (!ac) {
2815                 /* clear all entries */
2816                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
2817                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
2818                 if (!do_quiet)
2819                         printf("Accounting cleared.\n");
2820
2821                 return;
2822         }
2823
2824         while (ac) {
2825                 /* Rule number */
2826                 if (isdigit(**av)) {
2827                         rulenum = atoi(*av);
2828                         av++;
2829                         ac--;
2830                         if (setsockopt(s, IPPROTO_IP,
2831                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
2832                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
2833                                     rulenum);
2834                                 failed = EX_UNAVAILABLE;
2835                         } else if (!do_quiet)
2836                                 printf("Entry %d cleared\n", rulenum);
2837                 } else {
2838                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
2839                 }
2840         }
2841         if (failed != EX_OK)
2842                 exit(failed);
2843 }
2844
2845 static void
2846 resetlog (int ac, char *av[])
2847 {
2848         int rulenum;
2849         int failed = EX_OK;
2850
2851         av++; ac--;
2852
2853         if (!ac) {
2854                 /* clear all entries */
2855                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
2856                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
2857                 if (!do_quiet)
2858                         printf("Logging counts reset.\n");
2859
2860                 return;
2861         }
2862
2863         while (ac) {
2864                 /* Rule number */
2865                 if (isdigit(**av)) {
2866                         rulenum = atoi(*av);
2867                         av++;
2868                         ac--;
2869                         if (setsockopt(s, IPPROTO_IP,
2870                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
2871                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
2872                                     rulenum);
2873                                 failed = EX_UNAVAILABLE;
2874                         } else if (!do_quiet)
2875                                 printf("Entry %d logging count reset\n",
2876                                     rulenum);
2877                 } else {
2878                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
2879                 }
2880         }
2881         if (failed != EX_OK)
2882                 exit(failed);
2883 }
2884
2885 static void
2886 flush()
2887 {
2888         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
2889
2890         if (!do_force && !do_quiet) { /* need to ask user */
2891                 int c;
2892
2893                 printf("Are you sure? [yn] ");
2894                 fflush(stdout);
2895                 do {
2896                         c = toupper(getc(stdin));
2897                         while (c != '\n' && getc(stdin) != '\n')
2898                                 if (feof(stdin))
2899                                         return; /* and do not flush */
2900                 } while (c != 'Y' && c != 'N');
2901                 printf("\n");
2902                 if (c == 'N')   /* user said no */
2903                         return;
2904         }
2905         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
2906                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
2907                     do_pipe ? "DUMMYNET" : "FW");
2908         if (!do_quiet)
2909                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
2910 }
2911
2912 static int
2913 ipfw_main(int ac, char **av)
2914 {
2915         int ch;
2916
2917         if (ac == 1)
2918                 show_usage();
2919
2920         /* Set the force flag for non-interactive processes */
2921         do_force = !isatty(STDIN_FILENO);
2922
2923         optind = optreset = 1;
2924         while ((ch = getopt(ac, av, "hs:adefNqtv")) != -1)
2925                 switch (ch) {
2926                 case 'h': /* help */
2927                         help();
2928                         break;  /* NOTREACHED */
2929
2930                 case 's': /* sort */
2931                         do_sort = atoi(optarg);
2932                         break;
2933                 case 'a':
2934                         do_acct = 1;
2935                         break;
2936                 case 'd':
2937                         do_dynamic = 1;
2938                         break;
2939                 case 'e':
2940                         do_expired = 1;
2941                         break;
2942                 case 'f':
2943                         do_force = 1;
2944                         break;
2945                 case 'N':
2946                         do_resolv = 1;
2947                         break;
2948                 case 'q':
2949                         do_quiet = 1;
2950                         break;
2951                 case 't':
2952                         do_time = 1;
2953                         break;
2954                 case 'v': /* verbose */
2955                         verbose++;
2956                         break;
2957                 default:
2958                         show_usage();
2959                 }
2960
2961         ac -= optind;
2962         av += optind;
2963         NEED1("bad arguments, for usage summary ``ipfw''");
2964
2965         /*
2966          * optional: pipe or queue
2967          */
2968         if (!strncmp(*av, "pipe", strlen(*av))) {
2969                 do_pipe = 1;
2970                 ac--;
2971                 av++;
2972         } else if (!strncmp(*av, "queue", strlen(*av))) {
2973                 do_pipe = 2;
2974                 ac--;
2975                 av++;
2976         }
2977         NEED1("missing command");
2978
2979         /*
2980          * for pipes and queues we normally say 'pipe NN config'
2981          * but the code is easier to parse as 'pipe config NN'
2982          * so we swap the two arguments.
2983          */
2984         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
2985                 char *p = av[0];
2986                 av[0] = av[1];
2987                 av[1] = p;
2988         }
2989         if (!strncmp(*av, "add", strlen(*av)))
2990                 add(ac, av);
2991         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
2992                 config_pipe(ac, av);
2993         else if (!strncmp(*av, "delete", strlen(*av)))
2994                 delete(ac, av);
2995         else if (!strncmp(*av, "flush", strlen(*av)))
2996                 flush();
2997         else if (!strncmp(*av, "zero", strlen(*av)))
2998                 zero(ac, av);
2999         else if (!strncmp(*av, "resetlog", strlen(*av)))
3000                 resetlog(ac, av);
3001         else if (!strncmp(*av, "print", strlen(*av)) ||
3002                  !strncmp(*av, "list", strlen(*av)))
3003                 list(ac, av);
3004         else if (!strncmp(*av, "show", strlen(*av))) {
3005                 do_acct++;
3006                 list(ac, av);
3007         } else
3008                 errx(EX_USAGE, "bad command `%s'", *av);
3009         return 0;
3010 }
3011
3012
3013 static void
3014 ipfw_readfile(int ac, char *av[])
3015 {
3016 #define MAX_ARGS        32
3017 #define WHITESP         " \t\f\v\n\r"
3018         char    buf[BUFSIZ];
3019         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3020         char    linename[10];
3021         int     i=0, lineno=0, qflag=0, pflag=0, status;
3022         FILE    *f = NULL;
3023         pid_t   preproc = 0;
3024         int     c;
3025
3026         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3027                 switch(c) {
3028                 case 'D':
3029                         if (!pflag)
3030                                 errx(EX_USAGE, "-D requires -p");
3031                         if (i > MAX_ARGS - 2)
3032                                 errx(EX_USAGE,
3033                                      "too many -D or -U options");
3034                         args[i++] = "-D";
3035                         args[i++] = optarg;
3036                         break;
3037
3038                 case 'U':
3039                         if (!pflag)
3040                                 errx(EX_USAGE, "-U requires -p");
3041                         if (i > MAX_ARGS - 2)
3042                                 errx(EX_USAGE,
3043                                      "too many -D or -U options");
3044                         args[i++] = "-U";
3045                         args[i++] = optarg;
3046                         break;
3047
3048                 case 'p':
3049                         pflag = 1;
3050                         cmd = optarg;
3051                         args[0] = cmd;
3052                         i = 1;
3053                         break;
3054
3055                 case 'q':
3056                         qflag = 1;
3057                         break;
3058
3059                 default:
3060                         errx(EX_USAGE, "bad arguments, for usage"
3061                              " summary ``ipfw''");
3062                 }
3063
3064         av += optind;
3065         ac -= optind;
3066         if (ac != 1)
3067                 errx(EX_USAGE, "extraneous filename arguments");
3068
3069         if ((f = fopen(av[0], "r")) == NULL)
3070                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3071
3072         if (pflag) {
3073                 /* pipe through preprocessor (cpp or m4) */
3074                 int pipedes[2];
3075
3076                 args[i] = 0;
3077
3078                 if (pipe(pipedes) == -1)
3079                         err(EX_OSERR, "cannot create pipe");
3080
3081                 switch((preproc = fork())) {
3082                 case -1:
3083                         err(EX_OSERR, "cannot fork");
3084
3085                 case 0:
3086                         /* child */
3087                         if (dup2(fileno(f), 0) == -1
3088                             || dup2(pipedes[1], 1) == -1)
3089                                 err(EX_OSERR, "dup2()");
3090                         fclose(f);
3091                         close(pipedes[1]);
3092                         close(pipedes[0]);
3093                         execvp(cmd, args);
3094                         err(EX_OSERR, "execvp(%s) failed", cmd);
3095
3096                 default:
3097                         /* parent */
3098                         fclose(f);
3099                         close(pipedes[1]);
3100                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3101                                 int savederrno = errno;
3102
3103                                 (void)kill(preproc, SIGTERM);
3104                                 errno = savederrno;
3105                                 err(EX_OSERR, "fdopen()");
3106                         }
3107                 }
3108         }
3109
3110         while (fgets(buf, BUFSIZ, f)) {
3111                 lineno++;
3112                 sprintf(linename, "Line %d", lineno);
3113                 args[0] = linename;
3114
3115                 if (*buf == '#')
3116                         continue;
3117                 if ((p = strchr(buf, '#')) != NULL)
3118                         *p = '\0';
3119                 i = 1;
3120                 if (qflag)
3121                         args[i++] = "-q";
3122                 for (a = strtok(buf, WHITESP);
3123                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3124                         args[i] = a;
3125                 if (i == (qflag? 2: 1))
3126                         continue;
3127                 if (i == MAX_ARGS)
3128                         errx(EX_USAGE, "%s: too many arguments",
3129                             linename);
3130                 args[i] = NULL;
3131
3132                 ipfw_main(i, args);
3133         }
3134         fclose(f);
3135         if (pflag) {
3136                 if (waitpid(preproc, &status, 0) == -1)
3137                         errx(EX_OSERR, "waitpid()");
3138                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3139                         errx(EX_UNAVAILABLE,
3140                             "preprocessor exited with status %d",
3141                             WEXITSTATUS(status));
3142                 else if (WIFSIGNALED(status))
3143                         errx(EX_UNAVAILABLE,
3144                             "preprocessor exited with signal %d",
3145                             WTERMSIG(status));
3146         }
3147 }
3148
3149 int
3150 main(int ac, char *av[])
3151 {
3152         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3153         if (s < 0)
3154                 err(EX_UNAVAILABLE, "socket");
3155
3156         /*
3157          * If the last argument is an absolute pathname, interpret it
3158          * as a file to be preprocessed.
3159          */
3160
3161         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3162                 ipfw_readfile(ac, av);
3163         else
3164                 ipfw_main(ac, av);
3165         return EX_OK;
3166 }