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 <unistd.h>
  44 #include <sysexits.h>
  45
  46 #include <net/if.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <netinet/ip_fw.h>
  52 #include <net/route.h> /* def. of struct route */
  53 #include <netinet/ip_dummynet.h>
  54 #include <netinet/tcp.h>
  55 #include <arpa/inet.h>
  56
  57 int             s,                      /* main RAW socket */
  58                 do_resolv,              /* Would try to resolve all */
  59                 do_acct,                /* Show packet/byte count */
  60                 do_time,                /* Show time stamps */
  61                 do_quiet,               /* Be quiet in add and flush */
  62                 do_force,               /* Don't ask for confirmation */
  63                 do_pipe,                /* this cmd refers to a pipe */
  64                 do_sort,                /* field to sort results (0 = no) */
  65                 do_dynamic,             /* display dynamic rules */
  66                 do_expired,             /* display expired dynamic rules */
  67                 verbose;
  68
  69 #define IP_MASK_ALL     0xffffffff
  70
  71 /*
  72  * structure to hold flag names and associated values to be
  73  * set in the appropriate masks.
  74  * A NULL string terminates the array.
  75  * Often, an element with 0 value contains an error string.
  76  *
  77  */
  78 struct _s_x {
  79         char *s;
  80         int x;
  81 };
  82
  83 static struct _s_x f_tcpflags[] = {
  84         { "syn", TH_SYN },
  85         { "fin", TH_FIN },
  86         { "ack", TH_ACK },
  87         { "psh", TH_PUSH },
  88         { "rst", TH_RST },
  89         { "urg", TH_URG },
  90         { "tcp flag", 0 },
  91         { NULL, 0 }
  92 };
  93
  94 static struct _s_x f_tcpopts[] = {
  95         { "mss",        IP_FW_TCPOPT_MSS },
  96         { "maxseg",     IP_FW_TCPOPT_MSS },
  97         { "window",     IP_FW_TCPOPT_WINDOW },
  98         { "sack",       IP_FW_TCPOPT_SACK },
  99         { "ts",         IP_FW_TCPOPT_TS },
 100         { "timestamp",  IP_FW_TCPOPT_TS },
 101         { "cc",         IP_FW_TCPOPT_CC },
 102         { "tcp option", 0 },
 103         { NULL, 0 }
 104 };
 105
 106 /*
 107  * IP options span the range 0 to 255 so we need to remap them
 108  * (though in fact only the low 5 bits are significant).
 109  */
 110 static struct _s_x f_ipopts[] = {
 111         { "ssrr",       IP_FW_IPOPT_SSRR},
 112         { "lsrr",       IP_FW_IPOPT_LSRR},
 113         { "rr",         IP_FW_IPOPT_RR},
 114         { "ts",         IP_FW_IPOPT_TS},
 115         { "ip option",  0 },
 116         { NULL, 0 }
 117 };
 118
 119 #if 0   /* XXX not used yet */
 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 #endif
 131
 132 static struct _s_x limit_masks[] = {
 133         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 134         {"src-addr",    DYN_SRC_ADDR},
 135         {"src-port",    DYN_SRC_PORT},
 136         {"dst-addr",    DYN_DST_ADDR},
 137         {"dst-port",    DYN_DST_PORT},
 138         {NULL,          0}
 139 };
 140
 141 /*
 142  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 143  * This is only used in this code.
 144  */
 145 #define IPPROTO_ETHERTYPE       0x1000
 146 static struct _s_x ether_types[] = {
 147     /*
 148      * Note, we cannot use "-:&/" in the names because they are field
 149      * separators in the type specifications. Also, we use s = NULL as
 150      * end-delimiter, because a type of 0 can be legal.
 151      */
 152         { "ip",         0x0800 },
 153         { "ipv4",       0x0800 },
 154         { "ipv6",       0x86dd },
 155         { "arp",        0x0806 },
 156         { "rarp",       0x8035 },
 157         { "vlan",       0x8100 },
 158         { "loop",       0x9000 },
 159         { "trail",      0x1000 },
 160         { "at",         0x809b },
 161         { "atalk",      0x809b },
 162         { "aarp",       0x80f3 },
 163         { "pppoe_disc", 0x8863 },
 164         { "pppoe_sess", 0x8864 },
 165         { "ipx_8022",   0x00E0 },
 166         { "ipx_8023",   0x0000 },
 167         { "ipx_ii",     0x8137 },
 168         { "ipx_snap",   0x8137 },
 169         { "ipx",        0x8137 },
 170         { "ns",         0x0600 },
 171         { NULL,         0 }
 172 };
 173
 174 static void show_usage(void);
 175
 176 enum tokens {
 177         TOK_NULL=0,
 178
 179         TOK_OR,
 180         TOK_NOT,
 181
 182         TOK_ACCEPT,
 183         TOK_COUNT,
 184         TOK_PIPE,
 185         TOK_QUEUE,
 186         TOK_DIVERT,
 187         TOK_TEE,
 188         TOK_FORWARD,
 189         TOK_SKIPTO,
 190         TOK_DENY,
 191         TOK_REJECT,
 192         TOK_RESET,
 193         TOK_UNREACH,
 194         TOK_CHECKSTATE,
 195
 196         TOK_UID,
 197         TOK_GID,
 198         TOK_IN,
 199         TOK_LIMIT,
 200         TOK_KEEPSTATE,
 201         TOK_LAYER2,
 202         TOK_OUT,
 203         TOK_XMIT,
 204         TOK_RECV,
 205         TOK_VIA,
 206         TOK_FRAG,
 207         TOK_IPOPTS,
 208         TOK_IPLEN,
 209         TOK_IPID,
 210         TOK_IPPRECEDENCE,
 211         TOK_IPTOS,
 212         TOK_IPTTL,
 213         TOK_IPVER,
 214         TOK_ESTAB,
 215         TOK_SETUP,
 216         TOK_TCPFLAGS,
 217         TOK_TCPOPTS,
 218         TOK_TCPSEQ,
 219         TOK_TCPACK,
 220         TOK_TCPWIN,
 221         TOK_ICMPTYPES,
 222
 223         TOK_PLR,
 224         TOK_BUCKETS,
 225         TOK_DSTIP,
 226         TOK_SRCIP,
 227         TOK_DSTPORT,
 228         TOK_SRCPORT,
 229         TOK_ALL,
 230         TOK_MASK,
 231         TOK_BW,
 232         TOK_DELAY,
 233         TOK_RED,
 234         TOK_GRED,
 235         TOK_DROPTAIL,
 236         TOK_PROTO,
 237         TOK_WEIGHT,
 238 };
 239
 240 struct _s_x dummynet_params[] = {
 241         { "plr",                TOK_PLR },
 242         { "buckets",            TOK_BUCKETS },
 243         { "dst-ip",             TOK_DSTIP },
 244         { "src-ip",             TOK_SRCIP },
 245         { "dst-port",           TOK_DSTPORT },
 246         { "src-port",           TOK_SRCPORT },
 247         { "proto",              TOK_PROTO },
 248         { "weight",             TOK_WEIGHT },
 249         { "all",                TOK_ALL },
 250         { "mask",               TOK_MASK },
 251         { "droptail",           TOK_DROPTAIL },
 252         { "red",                TOK_RED },
 253         { "gred",               TOK_GRED },
 254         { "bw",                 TOK_BW },
 255         { "bandwidth",          TOK_BW },
 256         { "delay",              TOK_DELAY },
 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         { "check-state",        TOK_CHECKSTATE },
 280         { NULL,                 TOK_NULL },
 281         { NULL, 0 }
 282 };
 283
 284 struct _s_x rule_options[] = {
 285         { "uid",                TOK_UID },
 286         { "gid",                TOK_GID },
 287         { "in",                 TOK_IN },
 288         { "limit",              TOK_LIMIT },
 289         { "keep-state",         TOK_KEEPSTATE },
 290         { "bridged",            TOK_LAYER2 },
 291         { "layer2",             TOK_LAYER2 },
 292         { "out",                TOK_OUT },
 293         { "xmit",               TOK_XMIT },
 294         { "recv",               TOK_RECV },
 295         { "via",                TOK_VIA },
 296         { "fragment",           TOK_FRAG },
 297         { "frag",               TOK_FRAG },
 298         { "ipoptions",          TOK_IPOPTS },
 299         { "ipopts",             TOK_IPOPTS },
 300         { "iplen",              TOK_IPLEN },
 301         { "ipid",               TOK_IPID },
 302         { "ipprecedence",       TOK_IPPRECEDENCE },
 303         { "iptos",              TOK_IPTOS },
 304         { "ipttl",              TOK_IPTTL },
 305         { "ipversion",          TOK_IPVER },
 306         { "ipver",              TOK_IPVER },
 307         { "estab",              TOK_ESTAB },
 308         { "established",        TOK_ESTAB },
 309         { "setup",              TOK_SETUP },
 310         { "tcpflags",           TOK_TCPFLAGS },
 311         { "tcpflgs",            TOK_TCPFLAGS },
 312         { "tcpoptions",         TOK_TCPOPTS },
 313         { "tcpopts",            TOK_TCPOPTS },
 314         { "tcpseq",             TOK_TCPSEQ },
 315         { "tcpack",             TOK_TCPACK },
 316         { "tcpwin",             TOK_TCPWIN },
 317         { "icmptypes",          TOK_ICMPTYPES },
 318
 319         { "not",                TOK_NOT },              /* pseudo option */
 320         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 321         { "or",                 TOK_OR },               /* pseudo option */
 322         { "|", /* escape */     TOK_OR },               /* pseudo option */
 323         { NULL,                 TOK_NULL },
 324         { NULL, 0 }
 325 };
 326
 327 /**
 328  * match_token takes a table and a string, returns the value associated
 329  * with the string (0 meaning an error in most cases)
 330  */
 331 static int
 332 match_token(struct _s_x *table, char *string)
 333 {
 334         struct _s_x *pt;
 335         int i = strlen(string);
 336
 337         for (pt = table ; i && pt->s != NULL ; pt++)
 338                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 339                         return pt->x;
 340         return -1;
 341 };
 342
 343 static char *
 344 match_value(struct _s_x *p, u_int32_t value)
 345 {
 346         for (; p->s != NULL; p++)
 347                 if (p->x == value)
 348                         return p->s;
 349         return NULL;
 350 }
 351
 352 /*
 353  * prints one port, symbolic or numeric
 354  */
 355 static void
 356 print_port(int proto, u_int16_t port)
 357 {
 358
 359         if (proto == IPPROTO_ETHERTYPE) {
 360                 char *s;
 361
 362                 if (do_resolv && (s = match_value(ether_types, port)) )
 363                         printf("%s", s);
 364                 else
 365                         printf("0x%04x", port);
 366         } else {
 367                 struct servent *se = NULL;
 368                 if (do_resolv) {
 369                         struct protoent *pe = getprotobynumber(proto);
 370
 371                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 372                 }
 373                 if (se)
 374                         printf("%s", se->s_name);
 375                 else
 376                         printf("%d", port);
 377         }
 378 }
 379
 380 /*
 381  * print the values in a list of ports
 382  * XXX todo: add support for mask.
 383  */
 384 static void
 385 print_newports(ipfw_insn_u16 *cmd, int proto)
 386 {
 387         u_int16_t *p = cmd->ports;
 388         int i;
 389         char *sep= " ";
 390
 391         if (cmd->o.len & F_NOT)
 392                 printf(" not");
 393         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 394                 printf(sep);
 395                 print_port(proto, p[0]);
 396                 if (p[0] != p[1]) {
 397                         printf("-");
 398                         print_port(proto, p[1]);
 399                 }
 400                 sep = ",";
 401         }
 402 }
 403
 404 /*
 405  * Like strtol, but also translates service names into port numbers
 406  * for some protocols.
 407  * In particular:
 408  *      proto == -1 disables the protocol check;
 409  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 410  *      proto == <some value in /etc/protocols> matches the values there.
 411  */
 412 static int
 413 strtoport(char *s, char **end, int base, int proto)
 414 {
 415         char *s1, sep;
 416         int i;
 417
 418         if ( *s == '\0')
 419                 goto none;
 420
 421         if (isdigit(*s))
 422                 return strtol(s, end, base);
 423
 424         /*
 425          * find separator and replace with a '\0'
 426          */
 427         for (s1 = s; *s1 && isalnum(*s1) ; s1++)
 428                 ;
 429         sep = *s1;
 430         *s1 = '\0';
 431
 432         if (proto == IPPROTO_ETHERTYPE) {
 433                 i = match_token(ether_types, s);
 434                 *s1 = sep;
 435                 if (i == -1) {  /* not found */
 436                         *end = s;
 437                         return 0;
 438                 } else {
 439                         *end = s1;
 440                         return i;
 441                 }
 442         } else {
 443                 struct protoent *pe = NULL;
 444                 struct servent *se;
 445
 446                 if (proto != 0)
 447                         pe = getprotobynumber(proto);
 448                 setservent(1);
 449                 se = getservbyname(s, pe ? pe->p_name : NULL);
 450                 *s1 = sep;
 451                 if (se != NULL) {
 452                         *end = s1;
 453                         return ntohs(se->s_port);
 454                 }
 455         }
 456 none:
 457         *end = s;
 458         return 0;
 459 }
 460
 461 /*
 462  * fill the body of the command with the list of port ranges.
 463  * At the moment it only understands numeric ranges.
 464  */
 465 static int
 466 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 467 {
 468         u_int16_t *p = cmd->ports;
 469         int i = 0;
 470
 471         for (; *av ; i++, p +=2 ) {
 472                 u_int16_t a, b;
 473                 char *s;
 474
 475                 a = strtoport(av, &s, 0, proto);
 476                 if (s == av) /* no parameter */
 477                         break;
 478                 if (*s == '-') { /* a range */
 479                         av = s+1;
 480                         b = strtoport(av, &s, 0, proto);
 481                         if (s == av) /* no parameter */
 482                                 break;
 483                         p[0] = a;
 484                         p[1] = b;
 485                 } else if (*s == ',' || *s == '\0' ) {
 486                         p[0] = p[1] = a;
 487                 } else  /* invalid separator */
 488                         break;
 489                 av = s+1;
 490         }
 491         if (i > 0) {
 492                 if (i+1 > F_LEN_MASK)
 493                         errx(EX_DATAERR, "too many port range\n");
 494                 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
 495         }
 496         return i;
 497 }
 498
 499 #if 0 /* XXX not used yet */
 500 static struct _s_x icmpcodes[] = {
 501       { "net",                  ICMP_UNREACH_NET },
 502       { "host",                 ICMP_UNREACH_HOST },
 503       { "protocol",             ICMP_UNREACH_PROTOCOL },
 504       { "port",                 ICMP_UNREACH_PORT },
 505       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 506       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 507       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 508       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 509       { "isolated",             ICMP_UNREACH_ISOLATED },
 510       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 511       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 512       { "tosnet",               ICMP_UNREACH_TOSNET },
 513       { "toshost",              ICMP_UNREACH_TOSHOST },
 514       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 515       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 516       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 517       { NULL, 0 }
 518 };
 519
 520 static void
 521 fill_reject_code(u_short *codep, char *str)
 522 {
 523         int val;
 524         char *s;
 525
 526         val = strtoul(str, &s, 0);
 527         if (s == str || *s != '\0' || val >= 0x100)
 528                 val = match_token(icmpcodes, str);
 529         if (val <= 0)
 530                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 531         *codep = val;
 532         return;
 533 }
 534
 535 static void
 536 print_reject_code(u_int32_t code)
 537 {
 538         char *s = match_value(icmpcodes, code);
 539
 540         if (s != NULL)
 541                 printf("%s", s);
 542         else
 543                 printf("%u", code);
 544 }
 545 #endif /* XXX not used yet */
 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
 682 /*
 683  * show_ipfw() prints the body of an ipfw rule.
 684  * Because the standard rule has at least proto src_ip dst_ip, we use
 685  * a helper function to produce these entries if not provided explicitly.
 686  */
 687 #define HAVE_PROTO      1
 688 #define HAVE_SRCIP      2
 689 #define HAVE_DSTIP      4
 690 #define HAVE_MAC        8
 691
 692 static void
 693 show_prerequisites(int *flags, int want)
 694 {
 695         if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
 696                 printf(" ip");
 697         if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 698                 printf(" from any");
 699         if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 700                 printf(" to any");
 701         *flags |= want;
 702 }
 703
 704 static void
 705 show_ipfw(struct ip_fw *rule)
 706 {
 707         int l;
 708         ipfw_insn *cmd;
 709         int proto = 0;          /* default */
 710         int flags = 0;  /* prerequisites */
 711         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 712         int or_block = 0;       /* we are in an or block */
 713
 714         printf("%05u ", rule->rulenum);
 715
 716         if (do_acct)
 717                 printf("%10qu %10qu ", rule->pcnt, rule->bcnt);
 718
 719         if (do_time) {
 720                 if (rule->timestamp) {
 721                         char timestr[30];
 722                         time_t t = _long_to_time(rule->timestamp);
 723
 724                         strcpy(timestr, ctime(&t));
 725                         *strchr(timestr, '\n') = '\0';
 726                         printf("%s ", timestr);
 727                 } else {
 728                         printf("                         ");
 729                 }
 730         }
 731
 732         /*
 733          * first print actions
 734          */
 735         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 736                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 737                 switch(cmd->opcode) {
 738                 case O_CHECK_STATE:
 739                         printf("check-state");
 740                         /* avoid printing anything else */
 741                         flags = HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP;
 742                         break;
 743
 744                 case O_PROB:
 745                     {
 746                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 747                         double d = 1.0 * p->d[0];
 748
 749                         d = 1 - (d / 0x7fffffff);
 750                         printf("prob %f ", d);
 751                     }
 752                         break;
 753
 754                 case O_ACCEPT:
 755                         printf("allow");
 756                         break;
 757
 758                 case O_COUNT:
 759                         printf("count");
 760                         break;
 761
 762                 case O_DENY:
 763                         printf("deny");
 764                         break;
 765
 766                 case O_SKIPTO:
 767                         printf("skipto %u", cmd->arg1);
 768                         break;
 769
 770                 case O_PIPE:
 771                         printf("pipe %u", cmd->arg1);
 772                         break;
 773
 774                 case O_QUEUE:
 775                         printf("queue %u", cmd->arg1);
 776                         break;
 777
 778                 case O_DIVERT:
 779                         printf("divert %u", cmd->arg1);
 780                         break;
 781
 782                 case O_TEE:
 783                         printf("tee %u", cmd->arg1);
 784                         break;
 785
 786                 case O_FORWARD_IP:
 787                     {
 788                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
 789
 790                         printf("fwd %s", inet_ntoa(s->sa.sin_addr));
 791                         if (s->sa.sin_port)
 792                                 printf(",%d", ntohs(s->sa.sin_port));
 793                     }
 794                         break;
 795
 796                 case O_LOG: /* O_LOG is printed last */
 797                         logptr = (ipfw_insn_log *)cmd;
 798                         break;
 799
 800                 default:
 801                         printf("** unrecognized action %d len %d",
 802                                 cmd->opcode, cmd->len);
 803                 }
 804         }
 805         if (logptr) {
 806                 if (logptr->max_log > 0)
 807                         printf(" log logamount %d ", logptr->max_log);
 808                 else
 809                         printf(" log ");
 810         }
 811         /*
 812          * then print the body
 813          */
 814         for (l = rule->act_ofs, cmd = rule->cmd ;
 815                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
 816                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;    /* useful alias */
 817
 818                 switch(cmd->opcode) {
 819                 case O_PROBE_STATE:
 820                         break; /* no need to print anything here */
 821
 822                 case O_MACADDR2: {
 823                         ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
 824                         if ( (flags & HAVE_MAC) == 0)
 825                                 printf(" MAC");
 826                         flags |= HAVE_MAC;
 827                         if (cmd->len & F_NOT)
 828                                 printf(" not");
 829                         print_mac( m->addr, m->mask);
 830                         print_mac( m->addr + 6, m->mask + 6);
 831                         }
 832                         break;
 833
 834                 case O_MAC_TYPE:
 835                         print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE);
 836                         break;
 837
 838                 case O_IP_SRC:
 839                 case O_IP_SRC_MASK:
 840                 case O_IP_SRC_ME:
 841                 case O_IP_SRC_SET:
 842                         show_prerequisites(&flags, HAVE_PROTO);
 843                         if (!(flags & HAVE_SRCIP))
 844                                 printf(" from");
 845                         if ((cmd->len & F_OR) && !or_block)
 846                                 printf(" {");
 847                         print_ip((ipfw_insn_ip *)cmd);
 848                         flags |= HAVE_SRCIP;
 849                         break;
 850
 851                 case O_IP_DST:
 852                 case O_IP_DST_MASK:
 853                 case O_IP_DST_ME:
 854                 case O_IP_DST_SET:
 855                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP);
 856                         if (!(flags & HAVE_DSTIP))
 857                                 printf(" to");
 858                         if ((cmd->len & F_OR) && !or_block)
 859                                 printf(" {");
 860                         print_ip((ipfw_insn_ip *)cmd);
 861                         flags |= HAVE_DSTIP;
 862                         break;
 863
 864                 case O_IP_DSTPORT:
 865                         show_prerequisites(&flags,
 866                                 HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
 867                 case O_IP_SRCPORT:
 868                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP);
 869                         print_newports((ipfw_insn_u16 *)cmd, proto);
 870                         break;
 871
 872                 case O_PROTO: {
 873                         struct protoent *pe;
 874
 875                         if ((cmd->len & F_OR) && !or_block)
 876                                 printf(" {");
 877                         if (cmd->len & F_NOT)
 878                                 printf(" not");
 879                         proto = cmd->arg1;
 880                         pe = getprotobynumber(cmd->arg1);
 881                         if (pe)
 882                                 printf(" %s", pe->p_name);
 883                         else
 884                                 printf(" %u", cmd->arg1);
 885                         }
 886                         flags |= HAVE_PROTO;
 887                         break;
 888
 889                 default: /*options ... */
 890                         show_prerequisites(&flags,
 891                             HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
 892                         if ((cmd->len & F_OR) && !or_block)
 893                                 printf(" {");
 894                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
 895                                 printf(" not");
 896                         switch(cmd->opcode) {
 897                         case O_FRAG:
 898                                 printf(" frag");
 899                                 break;
 900
 901                         case O_IN:
 902                                 printf(cmd->len & F_NOT ? " out" : " in");
 903                                 break;
 904
 905                         case O_LAYER2:
 906                                 printf(" layer2");
 907                                 break;
 908                         case O_XMIT:
 909                         case O_RECV:
 910                         case O_VIA: {
 911                                 char *s;
 912                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
 913
 914                                 if (cmd->opcode == O_XMIT)
 915                                         s = "xmit";
 916                                 else if (cmd->opcode == O_RECV)
 917                                         s = "recv";
 918                                 else if (cmd->opcode == O_VIA)
 919                                         s = "via";
 920                                 if (cmdif->name[0] == '\0')
 921                                         printf(" %s %s", s, inet_ntoa(cmdif->p.ip));
 922                                 else if (cmdif->p.unit == -1)
 923                                         printf(" %s %s*", s, cmdif->name);
 924                                 else
 925                                         printf(" %s %s%d", s, cmdif->name, cmdif->p.unit);
 926                                 }
 927                                 break;
 928
 929                         case O_IPID:
 930                                 printf(" ipid %u", cmd->arg1 );
 931                                 break;
 932
 933                         case O_IPTTL:
 934                                 printf(" ipttl %u", cmd->arg1 );
 935                                 break;
 936
 937                         case O_IPVER:
 938                                 printf(" ipver %u", cmd->arg1 );
 939                                 break;
 940
 941                         case O_IPLEN:
 942                                 printf(" iplen %u", cmd->arg1 );
 943                                 break;
 944
 945                         case O_IPOPTS:
 946                                 print_flags("ipoptions", cmd, f_ipopts);
 947                                 break;
 948
 949                         case O_ESTAB:
 950                                 printf(" established");
 951                                 break;
 952
 953                         case O_TCPFLAGS:
 954                                 print_flags("tcpflags", cmd, f_tcpflags);
 955                                 break;
 956
 957                         case O_TCPOPTS:
 958                                 print_flags("tcpoptions", cmd, f_tcpopts);
 959                                 break;
 960
 961                         case O_TCPWIN:
 962                                 printf(" tcpwin %d", ntohs(cmd->arg1));
 963                                 break;
 964
 965                         case O_TCPACK:
 966                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
 967                                 break;
 968
 969                         case O_TCPSEQ:
 970                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
 971                                 break;
 972
 973                         case O_UID:
 974                             {
 975                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
 976
 977                                 if (pwd)
 978                                         printf(" uid %s", pwd->pw_name);
 979                                 else
 980                                         printf(" uid %u", cmd32->d[0]);
 981                             }
 982                                 break;
 983
 984                         case O_GID:
 985                             {
 986                                 struct group *grp = getgrgid(cmd32->d[0]);
 987
 988                                 if (grp)
 989                                         printf(" gid %s", grp->gr_name);
 990                                 else
 991                                         printf(" gid %u", cmd32->d[0]);
 992                             }
 993                                 break;
 994
 995                         case O_KEEP_STATE:
 996                                 printf(" keep-state");
 997                                 break;
 998
 999                         case O_LIMIT:
1000                             {
1001                                 struct _s_x *p = limit_masks;
1002                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1003                                 u_int8_t x = c->limit_mask;
1004                                 char *comma = " ";
1005
1006                                 printf(" limit");
1007                                 for ( ; p->x != 0 ; p++)
1008                                         if (x & p->x) {
1009                                                 x &= ~p->x;
1010                                                 printf("%s%s", comma, p->s);
1011                                                 comma = ",";
1012                                         }
1013                                 printf(" %d", c->conn_limit);
1014                             }
1015                                 break;
1016
1017                         default:
1018                                 printf(" [opcode %d len %d]",
1019                                     cmd->opcode, cmd->len);
1020                         }
1021                 }
1022                 if (cmd->len & F_OR) {
1023                         printf(" or");
1024                         or_block = 1;
1025                 } else if (or_block) {
1026                         printf(" }");
1027                         or_block = 0;
1028                 }
1029         }
1030         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
1031
1032 #if 0   /* old stuff */
1033         switch (chain->fw_flg & IP_FW_F_COMMAND) {
1034         case IP_FW_F_REJECT:
1035                 if (chain->fw_reject_code == IP_FW_REJECT_RST)
1036                         printf("reset");
1037                 else {
1038                         printf("unreach ");
1039                         print_reject_code(chain->fw_reject_code);
1040                 }
1041                 break;
1042         }
1043
1044 do_options:
1045         if (chain->fw_ipflg & IP_FW_IF_IPOPT)
1046                 print_flags("ipopt", chain->fw_ipopt, chain->fw_ipnopt,
1047                         f_ipopts);
1048
1049         if (chain->fw_ipflg & IP_FW_IF_IPPRE)
1050                 printf(" ipprecedence %u", (chain->fw_iptos & 0xe0) >> 5);
1051
1052         if (chain->fw_ipflg & IP_FW_IF_IPTOS)
1053                 print_flags("iptos", chain->fw_iptos, chain->fw_ipntos,
1054                         f_iptos);
1055
1056         if (chain->fw_flg & IP_FW_F_ICMPBIT) {
1057                 int i, first = 1;
1058                 unsigned j;
1059
1060                 printf(" icmptype");
1061
1062                 for (i = 0; i < IP_FW_ICMPTYPES_DIM; ++i)
1063                         for (j = 0; j < sizeof(unsigned) * 8; ++j)
1064                                 if (chain->fw_uar.fw_icmptypes[i] & (1 << j)) {
1065                                         printf("%c%d", first ? ' ' : ',',
1066                                             i * sizeof(unsigned) * 8 + j);
1067                                         first = 0;
1068                                 }
1069         }
1070 #endif /* XXX old stuff */
1071         printf("\n");
1072 }
1073
1074 static void
1075 show_dyn_ipfw(ipfw_dyn_rule *d)
1076 {
1077         struct protoent *pe;
1078         struct in_addr a;
1079
1080         if (!do_expired) {
1081                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1082                         return;
1083         }
1084
1085         printf("%05d %10qu %10qu (%ds)",
1086             (int)(d->rule), d->pcnt, d->bcnt, d->expire);
1087         switch (d->dyn_type) {
1088         case O_LIMIT_PARENT:
1089                 printf(" PARENT %d", d->count);
1090                 break;
1091         case O_LIMIT:
1092                 printf(" LIMIT");
1093                 break;
1094         case O_KEEP_STATE: /* bidir, no mask */
1095                 printf(" STATE");
1096                 break;
1097         }
1098
1099         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1100                 printf(" %s", pe->p_name);
1101         else
1102                 printf(" proto %u", d->id.proto);
1103
1104         a.s_addr = htonl(d->id.src_ip);
1105         printf(" %s %d", inet_ntoa(a), d->id.src_port);
1106
1107         a.s_addr = htonl(d->id.dst_ip);
1108         printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1109         printf("\n");
1110 }
1111
1112 int
1113 sort_q(const void *pa, const void *pb)
1114 {
1115         int rev = (do_sort < 0);
1116         int field = rev ? -do_sort : do_sort;
1117         long long res = 0;
1118         const struct dn_flow_queue *a = pa;
1119         const struct dn_flow_queue *b = pb;
1120
1121         switch (field) {
1122         case 1: /* pkts */
1123                 res = a->len - b->len;
1124                 break;
1125         case 2: /* bytes */
1126                 res = a->len_bytes - b->len_bytes;
1127                 break;
1128
1129         case 3: /* tot pkts */
1130                 res = a->tot_pkts - b->tot_pkts;
1131                 break;
1132
1133         case 4: /* tot bytes */
1134                 res = a->tot_bytes - b->tot_bytes;
1135                 break;
1136         }
1137         if (res < 0)
1138                 res = -1;
1139         if (res > 0)
1140                 res = 1;
1141         return (int)(rev ? res : -res);
1142 }
1143
1144 static void
1145 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
1146 {
1147         int l;
1148
1149         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1150             fs->flow_mask.proto,
1151             fs->flow_mask.src_ip, fs->flow_mask.src_port,
1152             fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
1153         if (fs->rq_elements == 0)
1154                 return;
1155
1156         printf("BKT Prot ___Source IP/port____ "
1157             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1158         if (do_sort != 0)
1159                 heapsort(q, fs->rq_elements, sizeof *q, sort_q);
1160         for (l = 0; l < fs->rq_elements; l++) {
1161                 struct in_addr ina;
1162                 struct protoent *pe;
1163
1164                 ina.s_addr = htonl(q[l].id.src_ip);
1165                 printf("%3d ", q[l].hash_slot);
1166                 pe = getprotobynumber(q[l].id.proto);
1167                 if (pe)
1168                         printf("%-4s ", pe->p_name);
1169                 else
1170                         printf("%4u ", q[l].id.proto);
1171                 printf("%15s/%-5d ",
1172                     inet_ntoa(ina), q[l].id.src_port);
1173                 ina.s_addr = htonl(q[l].id.dst_ip);
1174                 printf("%15s/%-5d ",
1175                     inet_ntoa(ina), q[l].id.dst_port);
1176                 printf("%4qu %8qu %2u %4u %3u\n",
1177                     q[l].tot_pkts, q[l].tot_bytes,
1178                     q[l].len, q[l].len_bytes, q[l].drops);
1179                 if (verbose)
1180                         printf("   S %20qd  F %20qd\n",
1181                             q[l].S, q[l].F);
1182         }
1183 }
1184
1185 static void
1186 print_flowset_parms(struct dn_flow_set *fs, char *prefix)
1187 {
1188         int l;
1189         char qs[30];
1190         char plr[30];
1191         char red[90];   /* Display RED parameters */
1192
1193         l = fs->qsize;
1194         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1195                 if (l >= 8192)
1196                         sprintf(qs, "%d KB", l / 1024);
1197                 else
1198                         sprintf(qs, "%d B", l);
1199         } else
1200                 sprintf(qs, "%3d sl.", l);
1201         if (fs->plr)
1202                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1203         else
1204                 plr[0] = '\0';
1205         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1206                 sprintf(red,
1207                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1208                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1209                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1210                     SCALE_VAL(fs->min_th),
1211                     SCALE_VAL(fs->max_th),
1212                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1213         else
1214                 sprintf(red, "droptail");
1215
1216         printf("%s %s%s %d queues (%d buckets) %s\n",
1217             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1218 }
1219
1220 static void
1221 list_pipes(void *data, int nbytes, int ac, char *av[])
1222 {
1223         u_long rulenum;
1224         void *next = data;
1225         struct dn_pipe *p = (struct dn_pipe *) data;
1226         struct dn_flow_set *fs;
1227         struct dn_flow_queue *q;
1228         int l;
1229
1230         if (ac > 0)
1231                 rulenum = strtoul(*av++, NULL, 10);
1232         else
1233                 rulenum = 0;
1234         for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
1235                 double b = p->bandwidth;
1236                 char buf[30];
1237                 char prefix[80];
1238
1239                 if (p->next != (struct dn_pipe *)DN_IS_PIPE)
1240                         break;  /* done with pipes, now queues */
1241
1242                 /*
1243                  * compute length, as pipe have variable size
1244                  */
1245                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1246                 next = (void *)p + l;
1247                 nbytes -= l;
1248
1249                 if (rulenum != 0 && rulenum != p->pipe_nr)
1250                         continue;
1251
1252                 /*
1253                  * Print rate (or clocking interface)
1254                  */
1255                 if (p->if_name[0] != '\0')
1256                         sprintf(buf, "%s", p->if_name);
1257                 else if (b == 0)
1258                         sprintf(buf, "unlimited");
1259                 else if (b >= 1000000)
1260                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1261                 else if (b >= 1000)
1262                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1263                 else
1264                         sprintf(buf, "%7.3f bit/s ", b);
1265
1266                 sprintf(prefix, "%05d: %s %4d ms ",
1267                     p->pipe_nr, buf, p->delay);
1268                 print_flowset_parms(&(p->fs), prefix);
1269                 if (verbose)
1270                         printf("   V %20qd\n", p->V >> MY_M);
1271
1272                 q = (struct dn_flow_queue *)(p+1);
1273                 list_queues(&(p->fs), q);
1274         }
1275         for (fs = next; nbytes >= sizeof *fs; fs = next) {
1276                 char prefix[80];
1277
1278                 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
1279                         break;
1280                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1281                 next = (void *)fs + l;
1282                 nbytes -= l;
1283                 q = (struct dn_flow_queue *)(fs+1);
1284                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1285                     fs->fs_nr, fs->weight, fs->parent_nr);
1286                 print_flowset_parms(fs, prefix);
1287                 list_queues(fs, q);
1288         }
1289 }
1290
1291 static void
1292 list(int ac, char *av[])
1293 {
1294         struct ip_fw *r;
1295         ipfw_dyn_rule *dynrules, *d;
1296
1297         void *lim, *data = NULL;
1298         int n, nbytes, nstat, ndyn;
1299         int exitval = EX_OK;
1300         int lac;
1301         char **lav;
1302         u_long rnum;
1303         char *endptr;
1304         int seen = 0;
1305
1306         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1307         int nalloc = 1024;      /* start somewhere... */
1308
1309         ac--;
1310         av++;
1311
1312         /* get rules or pipes from kernel, resizing array as necessary */
1313         nbytes = nalloc;
1314
1315         while (nbytes >= nalloc) {
1316                 nalloc = nalloc * 2 + 200;
1317                 nbytes = nalloc;
1318                 if ((data = realloc(data, nbytes)) == NULL)
1319                         err(EX_OSERR, "realloc");
1320                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1321                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1322                                 do_pipe ? "DUMMYNET" : "FW");
1323         }
1324
1325         if (do_pipe) {
1326                 list_pipes(data, nbytes, ac, av);
1327                 goto done;
1328         }
1329
1330         /*
1331          * Count static rules. They have variable size so we
1332          * need to scan the list to count them.
1333          */
1334         for (nstat = 1, r = data, lim = data + nbytes;
1335                     r->rulenum < 65535 && (void *)r < lim;
1336                     ++nstat, r = (void *)r + RULESIZE(r) )
1337                 ; /* nothing */
1338
1339         /*
1340          * Count dynamic rules. This is easier as they have
1341          * fixed size.
1342          */
1343         r = (void *)r + RULESIZE(r);
1344         dynrules = (ipfw_dyn_rule *)r ;
1345         n = (void *)r - data;
1346         ndyn = (nbytes - n) / sizeof *dynrules;
1347
1348         /* if no rule numbers were specified, list all rules */
1349         if (ac == 0) {
1350                 for (n = 0, r = data; n < nstat;
1351                     n++, r = (void *)r + RULESIZE(r) )
1352                         show_ipfw(r);
1353
1354                 if (do_dynamic && ndyn) {
1355                         printf("## Dynamic rules (%d):\n", ndyn);
1356                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1357                                 show_dyn_ipfw(d);
1358                 }
1359                 goto done;
1360         }
1361
1362         /* display specific rules requested on command line */
1363
1364         for (lac = ac, lav = av; lac != 0; lac--) {
1365                 /* convert command line rule # */
1366                 rnum = strtoul(*lav++, &endptr, 10);
1367                 if (*endptr) {
1368                         exitval = EX_USAGE;
1369                         warnx("invalid rule number: %s", *(lav - 1));
1370                         continue;
1371                 }
1372                 for (n = seen = 0, r = data; n < nstat;
1373                     n++, r = (void *)r + RULESIZE(r) ) {
1374                         if (r->rulenum > rnum)
1375                                 break;
1376                         if (r->rulenum == rnum) {
1377                                 show_ipfw(r);
1378                                 seen = 1;
1379                         }
1380                 }
1381                 if (!seen) {
1382                         /* give precedence to other error(s) */
1383                         if (exitval == EX_OK)
1384                                 exitval = EX_UNAVAILABLE;
1385                         warnx("rule %lu does not exist", rnum);
1386                 }
1387         }
1388
1389         if (do_dynamic && ndyn) {
1390                 printf("## Dynamic rules:\n");
1391                 for (lac = ac, lav = av; lac != 0; lac--) {
1392                         rnum = strtoul(*lav++, &endptr, 10);
1393                         if (*endptr)
1394                                 /* already warned */
1395                                 continue;
1396                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1397                                 if ((int)(d->rule) > rnum)
1398                                         break;
1399                                 if ((int)(d->rule) == rnum)
1400                                         show_dyn_ipfw(d);
1401                         }
1402                 }
1403         }
1404
1405         ac = 0;
1406
1407 done:
1408         free(data);
1409
1410         if (exitval != EX_OK)
1411                 exit(exitval);
1412 }
1413
1414 static void
1415 show_usage(void)
1416 {
1417         fprintf(stderr, "usage: ipfw [options]\n"
1418 "    add [number] rule\n"
1419 "    pipe number config [pipeconfig]\n"
1420 "    queue number config [queueconfig]\n"
1421 "    [pipe] flush\n"
1422 "    [pipe] delete number ...\n"
1423 "    [pipe] {list|show} [number ...]\n"
1424 "    {zero|resetlog} [number ...]\n"
1425 "do \"ipfw -h\" or see ipfw manpage for details\n"
1426 );
1427
1428         exit(EX_USAGE);
1429 }
1430
1431 static void
1432 help(void)
1433 {
1434
1435         fprintf(stderr, "ipfw syntax summary:\n"
1436 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1437 "ipfw {pipe|queue} N config BODY\n"
1438 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1439 "\n"
1440 "RULE:          [1..] [PROB] BODY\n"
1441 "RULENUM:       INTEGER(1..65534)\n"
1442 "PROB:          prob REAL(0..1)\n"
1443 "BODY:          check-state [LOG] (no body) |\n"
1444 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1445 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1446 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1447 "ADDR:          [ MAC dst src ether_type ] \n"
1448 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1449 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1450 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1451 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1452 );
1453 exit(0);
1454 }
1455
1456
1457 static int
1458 lookup_host (char *host, struct in_addr *ipaddr)
1459 {
1460         struct hostent *he;
1461
1462         if (!inet_aton(host, ipaddr)) {
1463                 if ((he = gethostbyname(host)) == NULL)
1464                         return(-1);
1465                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1466         }
1467         return(0);
1468 }
1469
1470 /*
1471  * fills the addr and mask fields in the instruction as appropriate from av.
1472  * Update length as appropriate.
1473  * The following formats are allowed:
1474  *      any     matches any IP. Actually returns an empty instruction.
1475  *      me      returns O_IP_*_ME
1476  *      1.2.3.4         single IP address
1477  *      1.2.3.4:5.6.7.8 address:mask
1478  *      1.2.3.4/24      address/mask
1479  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1480  */
1481 static void
1482 fill_ip(ipfw_insn_ip *cmd, char *av)
1483 {
1484         char *p = 0, md = 0;
1485         u_int32_t i;
1486
1487         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1488
1489         if (!strncmp(av, "any", strlen(av)))
1490                 return;
1491
1492         if (!strncmp(av, "me", strlen(av))) {
1493                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1494                 return;
1495         }
1496
1497         p = strchr(av, '/');
1498         if (!p)
1499                 p = strchr(av, ':');
1500         if (p) {
1501                 md = *p;
1502                 *p++ = '\0';
1503         }
1504
1505         if (lookup_host(av, &cmd->addr) != 0)
1506                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1507         switch (md) {
1508         case ':':
1509                 if (!inet_aton(p, &cmd->mask))
1510                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1511                 break;
1512         case '/':
1513                 i = atoi(p);
1514                 if (i == 0)
1515                         cmd->mask.s_addr = htonl(0);
1516                 else if (i > 32)
1517                         errx(EX_DATAERR, "bad width ``%s''", p);
1518                 else
1519                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1520                 break;
1521         default:
1522                 cmd->mask.s_addr = htonl(~0);
1523                 break;
1524         }
1525         cmd->addr.s_addr &= cmd->mask.s_addr;
1526         /*
1527          * now look if we have a set of addresses. They are stored as follows:
1528          *   arg1       is the set size (powers of 2, 2..256)
1529          *   addr       is the base address IN HOST FORMAT
1530          *   mask..     is an array of u_int32_t with bits set.
1531          */
1532         if (p)
1533                 p = strchr(p, '{');
1534         if (p) {        /* fetch addresses */
1535                 u_int32_t *d;
1536                 int low, high;
1537                 int i = contigmask((u_char *)&(cmd->mask), 32);
1538
1539                 if (i < 24 || i > 31) {
1540                         fprintf(stderr, "invalid set with mask %d\n",
1541                                 i);
1542                         exit(0);
1543                 }
1544                 cmd->o.arg1 = 1<<(32-i);
1545                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1546                 d = (u_int32_t *)&cmd->mask;
1547                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1548                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1549                 fprintf(stderr,"-- set size %d cmdlen %d\n",
1550                         cmd->o.arg1, cmd->o.len );
1551                 for (i = 0; i < cmd->o.arg1/32 ; i++)
1552                         d[i] = 0;       /* clear masks */
1553
1554                 av = p+1;
1555                 low = cmd->addr.s_addr & 0xff;
1556                 high = low + cmd->o.arg1 - 1;
1557                 while (isdigit(*av)) {
1558                         char *s;
1559                         u_int16_t a = strtol(av, &s, 0);
1560
1561                         if (s == av) /* no parameter */
1562                                 break;
1563                         if (a < low || a > high) {
1564                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1565                                 a, low, high);
1566                             exit(0);
1567                         }
1568                         a -= low;
1569                         d[ a/32] |= 1<<(a & 31);
1570                         if (*s != ',')
1571                                 break;
1572                         av = s+1;
1573                 }
1574                 return;
1575         }
1576
1577         if (cmd->mask.s_addr == 0) { /* any */
1578                 if (cmd->o.len & F_NOT)
1579                         errx(EX_DATAERR, "not any never matches");
1580                 else    /* useless, nuke it */
1581                         return;
1582         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1583                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1584         else                                            /* addr/mask */
1585                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1586 }
1587
1588
1589 /*
1590  * helper function to process a set of flags and set bits in the
1591  * appropriate masks.
1592  */
1593 static void
1594 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1595         struct _s_x *flags, char *p)
1596 {
1597         u_int8_t set=0, clear=0;
1598
1599         while (p && *p) {
1600                 char *q;        /* points to the separator */
1601                 int val;
1602                 u_int8_t *which;        /* mask we are working on */
1603
1604                 if (*p == '!') {
1605                         p++;
1606                         which = &clear;
1607                 } else
1608                         which = &set;
1609                 q = strchr(p, ',');
1610                 if (q)
1611                         *q++ = '\0';
1612                 val = match_token(flags, p);
1613                 if (val <= 0)
1614                         errx(EX_DATAERR, "invalid flag %s", p);
1615                 *which |= (u_int8_t)val;
1616                 p = q;
1617         }
1618         cmd->opcode = opcode;
1619         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1620         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1621 }
1622
1623 #if 0 /* XXX todo */
1624 static void
1625 fill_icmptypes(unsigned *types, char **vp, u_int *fw_flg)
1626 {
1627         unsigned long icmptype;
1628         char *c = *vp;
1629
1630         while (*c) {
1631                 if (*c == ',')
1632                         ++c;
1633
1634                 icmptype = strtoul(c, &c, 0);
1635
1636                 if (*c != ',' && *c != '\0')
1637                         errx(EX_DATAERR, "invalid ICMP type");
1638
1639                 if (icmptype >= IP_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8)
1640                         errx(EX_DATAERR, "ICMP type out of range");
1641
1642                 types[icmptype / (sizeof(unsigned) * 8)] |=
1643                         1 << (icmptype % (sizeof(unsigned) * 8));
1644                 *fw_flg |= IP_FW_F_ICMPBIT;
1645         }
1646 }
1647 #endif /* XXX todo */
1648
1649 static void
1650 delete(int ac, char *av[])
1651 {
1652         int rulenum;
1653         struct dn_pipe pipe;
1654         int i;
1655         int exitval = EX_OK;
1656
1657         memset(&pipe, 0, sizeof pipe);
1658
1659         av++; ac--;
1660
1661         /* Rule number */
1662         while (ac && isdigit(**av)) {
1663                 i = atoi(*av); av++; ac--;
1664                 if (do_pipe) {
1665                         if (do_pipe == 1)
1666                                 pipe.pipe_nr = i;
1667                         else
1668                                 pipe.fs.fs_nr = i;
1669                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1670                             &pipe, sizeof pipe);
1671                         if (i) {
1672                                 exitval = 1;
1673                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1674                                     do_pipe == 1 ? pipe.pipe_nr :
1675                                     pipe.fs.fs_nr);
1676                         }
1677                 } else {
1678                         rulenum = i;
1679                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1680                             sizeof rulenum);
1681                         if (i) {
1682                                 exitval = EX_UNAVAILABLE;
1683                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1684                                     rulenum);
1685                         }
1686                 }
1687         }
1688         if (exitval != EX_OK)
1689                 exit(exitval);
1690 }
1691
1692
1693 /*
1694  * fill the interface structure. We do not check the name as we can
1695  * create interfaces dynamically, so checking them at insert time
1696  * makes relatively little sense.
1697  * A '*' following the name means any unit.
1698  */
1699 static void
1700 fill_iface(ipfw_insn_if *cmd, char *arg)
1701 {
1702         cmd->name[0] = '\0';
1703         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1704
1705         /* Parse the interface or address */
1706         if (!strcmp(arg, "any"))
1707                 cmd->o.len = 0;         /* effectively ignore this command */
1708         else if (!isdigit(*arg)) {
1709                 char *q;
1710
1711                 strncpy(cmd->name, arg, sizeof(cmd->name));
1712                 cmd->name[sizeof(cmd->name) - 1] = '\0';
1713                 /* find first digit or wildcard */
1714                 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++)
1715                         continue;
1716                 cmd->p.unit = (*q == '*') ? -1 : atoi(q);
1717                 *q = '\0';
1718         } else if (!inet_aton(arg, &cmd->p.ip))
1719                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1720 }
1721
1722 /*
1723  * the following macro returns an error message if we run out of
1724  * arguments.
1725  */
1726 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
1727
1728 static void
1729 config_pipe(int ac, char **av)
1730 {
1731         struct dn_pipe pipe;
1732         int i;
1733         char *end;
1734         u_int32_t a;
1735         void *par = NULL;
1736
1737         memset(&pipe, 0, sizeof pipe);
1738
1739         av++; ac--;
1740         /* Pipe number */
1741         if (ac && isdigit(**av)) {
1742                 i = atoi(*av); av++; ac--;
1743                 if (do_pipe == 1)
1744                         pipe.pipe_nr = i;
1745                 else
1746                         pipe.fs.fs_nr = i;
1747         }
1748         while (ac > 1) {
1749                 double d;
1750                 int tok = match_token(dummynet_params, *av);
1751                 ac--; av++;
1752
1753                 switch(tok) {
1754                 case TOK_PLR:
1755                         NEED1("plr needs argument 0..1\n");
1756                         d = strtod(av[0], NULL);
1757                         if (d > 1)
1758                                 d = 1;
1759                         else if (d < 0)
1760                                 d = 0;
1761                         pipe.fs.plr = (int)(d*0x7fffffff);
1762                         ac--; av++;
1763                         break;
1764
1765                 case TOK_QUEUE:
1766                         NEED1("queue needs queue size\n");
1767                         end = NULL;
1768                         pipe.fs.qsize = strtoul(av[0], &end, 0);
1769                         if (*end == 'K' || *end == 'k') {
1770                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
1771                                 pipe.fs.qsize *= 1024;
1772                         } else if (*end == 'B' || !strncmp(end, "by", 2)) {
1773                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
1774                         }
1775                         ac--; av++;
1776                         break;
1777
1778                 case TOK_BUCKETS:
1779                         NEED1("buckets needs argument\n");
1780                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
1781                         ac--; av++;
1782                         break;
1783
1784                 case TOK_MASK:
1785                         NEED1("mask needs mask specifier\n");
1786                         /*
1787                          * per-flow queue, mask is dst_ip, dst_port,
1788                          * src_ip, src_port, proto measured in bits
1789                          */
1790                         par = NULL;
1791
1792                         pipe.fs.flow_mask.dst_ip = 0;
1793                         pipe.fs.flow_mask.src_ip = 0;
1794                         pipe.fs.flow_mask.dst_port = 0;
1795                         pipe.fs.flow_mask.src_port = 0;
1796                         pipe.fs.flow_mask.proto = 0;
1797                         end = NULL;
1798
1799                         while (ac >= 1) {
1800                             u_int32_t *p32 = NULL;
1801                             u_int16_t *p16 = NULL;
1802
1803                             tok = match_token(dummynet_params, *av);
1804                             ac--; av++;
1805                             switch(tok) {
1806                             case TOK_ALL:
1807                                     /*
1808                                      * special case, all bits significant
1809                                      */
1810                                     pipe.fs.flow_mask.dst_ip = ~0;
1811                                     pipe.fs.flow_mask.src_ip = ~0;
1812                                     pipe.fs.flow_mask.dst_port = ~0;
1813                                     pipe.fs.flow_mask.src_port = ~0;
1814                                     pipe.fs.flow_mask.proto = ~0;
1815                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
1816                                     goto end_mask;
1817
1818                             case TOK_DSTIP:
1819                                     p32 = &pipe.fs.flow_mask.dst_ip;
1820                                     break;
1821
1822                             case TOK_SRCIP:
1823                                     p32 = &pipe.fs.flow_mask.src_ip;
1824                                     break;
1825
1826                             case TOK_DSTPORT:
1827                                     p16 = &pipe.fs.flow_mask.dst_port;
1828                                     break;
1829
1830                             case TOK_SRCPORT:
1831                                     p16 = &pipe.fs.flow_mask.src_port;
1832                                     break;
1833
1834                             case TOK_PROTO:
1835                                     break;
1836
1837                             default:
1838                                     ac++; av--; /* backtrack */
1839                                     goto end_mask;
1840                             }
1841                             if (ac < 1)
1842                                     errx(EX_USAGE, "mask: value missing");
1843                             if (*av[0] == '/') {
1844                                     a = strtoul(av[0]+1, &end, 0);
1845                                     a = (a == 32) ? ~0 : (1 << a) - 1;
1846                             } else
1847                                     a = strtoul(av[1], &end, 0);
1848                             if (p32 != NULL)
1849                                     *p32 = a;
1850                             else if (p16 != NULL) {
1851                                     if (a > 65535)
1852                                             errx(EX_DATAERR,
1853                                                 "mask: must be 16 bit");
1854                                     *p16 = (u_int16_t)a;
1855                             } else {
1856                                     if (a > 255)
1857                                             errx(EX_DATAERR,
1858                                                 "mask: must be 8 bit");
1859                                     pipe.fs.flow_mask.proto = (u_int8_t)a;
1860                             }
1861                             if (a != 0)
1862                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
1863                             ac--; av++;
1864                         } /* end while, config masks */
1865 end_mask:
1866                         break;
1867
1868                 case TOK_RED:
1869                 case TOK_GRED:
1870                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
1871                         pipe.fs.flags_fs |= DN_IS_RED;
1872                         if (tok == TOK_GRED)
1873                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
1874                         /*
1875                          * the format for parameters is w_q/min_th/max_th/max_p
1876                          */
1877                         if ((end = strsep(&av[0], "/"))) {
1878                             double w_q = strtod(end, NULL);
1879                             if (w_q > 1 || w_q <= 0)
1880                                 errx(EX_DATAERR, "0 < w_q <= 1");
1881                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
1882                         }
1883                         if ((end = strsep(&av[0], "/"))) {
1884                             pipe.fs.min_th = strtoul(end, &end, 0);
1885                             if (*end == 'K' || *end == 'k')
1886                                 pipe.fs.min_th *= 1024;
1887                         }
1888                         if ((end = strsep(&av[0], "/"))) {
1889                             pipe.fs.max_th = strtoul(end, &end, 0);
1890                             if (*end == 'K' || *end == 'k')
1891                                 pipe.fs.max_th *= 1024;
1892                         }
1893                         if ((end = strsep(&av[0], "/"))) {
1894                             double max_p = strtod(end, NULL);
1895                             if (max_p > 1 || max_p <= 0)
1896                                 errx(EX_DATAERR, "0 < max_p <= 1");
1897                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
1898                         }
1899                         ac--; av++;
1900                         break;
1901
1902                 case TOK_DROPTAIL:
1903                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
1904                         break;
1905
1906                 case TOK_BW:
1907                         NEED1("bw needs bandwidth or interface\n");
1908                         if (do_pipe != 1)
1909                             errx(EX_DATAERR, "bandwidth only valid for pipes");
1910                         /*
1911                          * set clocking interface or bandwidth value
1912                          */
1913                         if (av[0][0] >= 'a' && av[0][0] <= 'z') {
1914                             int l = sizeof(pipe.if_name)-1;
1915                             /* interface name */
1916                             strncpy(pipe.if_name, av[0], l);
1917                             pipe.if_name[l] = '\0';
1918                             pipe.bandwidth = 0;
1919                         } else {
1920                             pipe.if_name[0] = '\0';
1921                             pipe.bandwidth = strtoul(av[0], &end, 0);
1922                             if (*end == 'K' || *end == 'k') {
1923                                 end++;
1924                                 pipe.bandwidth *= 1000;
1925                             } else if (*end == 'M') {
1926                                 end++;
1927                                 pipe.bandwidth *= 1000000;
1928                             }
1929                             if (*end == 'B' || !strncmp(end, "by", 2))
1930                                 pipe.bandwidth *= 8;
1931                             if (pipe.bandwidth < 0)
1932                                 errx(EX_DATAERR, "bandwidth too large");
1933                         }
1934                         ac--; av++;
1935                         break;
1936
1937                 case TOK_DELAY:
1938                         if (do_pipe != 1)
1939                                 errx(EX_DATAERR, "delay only valid for pipes");
1940                         NEED1("delay needs argument 0..10000ms\n");
1941                         pipe.delay = strtoul(av[0], NULL, 0);
1942                         ac--; av++;
1943                         break;
1944
1945                 case TOK_WEIGHT:
1946                         if (do_pipe == 1)
1947                                 errx(EX_DATAERR,"weight only valid for queues");
1948                         NEED1("weight needs argument 0..100\n");
1949                         pipe.fs.weight = strtoul(av[0], &end, 0);
1950                         ac--; av++;
1951                         break;
1952
1953                 case TOK_PIPE:
1954                         if (do_pipe == 1)
1955                                 errx(EX_DATAERR,"pipe only valid for queues");
1956                         NEED1("pipe needs pipe_number\n");
1957                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
1958                         ac--; av++;
1959                         break;
1960
1961                 default:
1962                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
1963                 }
1964         }
1965         if (do_pipe == 1) {
1966                 if (pipe.pipe_nr == 0)
1967                         errx(EX_DATAERR, "pipe_nr must be > 0");
1968                 if (pipe.delay > 10000)
1969                         errx(EX_DATAERR, "delay must be < 10000");
1970         } else { /* do_pipe == 2, queue */
1971                 if (pipe.fs.parent_nr == 0)
1972                         errx(EX_DATAERR, "pipe must be > 0");
1973                 if (pipe.fs.weight >100)
1974                         errx(EX_DATAERR, "weight must be <= 100");
1975         }
1976         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
1977                 if (pipe.fs.qsize > 1024*1024)
1978                         errx(EX_DATAERR, "queue size must be < 1MB");
1979         } else {
1980                 if (pipe.fs.qsize > 100)
1981                         errx(EX_DATAERR, "2 <= queue size <= 100");
1982         }
1983         if (pipe.fs.flags_fs & DN_IS_RED) {
1984                 size_t len;
1985                 int lookup_depth, avg_pkt_size;
1986                 double s, idle, weight, w_q;
1987                 struct clockinfo clock;
1988                 int t;
1989
1990                 if (pipe.fs.min_th >= pipe.fs.max_th)
1991                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
1992                         pipe.fs.min_th, pipe.fs.max_th);
1993                 if (pipe.fs.max_th == 0)
1994                     errx(EX_DATAERR, "max_th must be > 0");
1995
1996                 len = sizeof(int);
1997                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
1998                         &lookup_depth, &len, NULL, 0) == -1)
1999
2000                     errx(1, "sysctlbyname(\"%s\")",
2001                         "net.inet.ip.dummynet.red_lookup_depth");
2002                 if (lookup_depth == 0)
2003                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2004                         " must be greater than zero");
2005
2006                 len = sizeof(int);
2007                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2008                         &avg_pkt_size, &len, NULL, 0) == -1)
2009
2010                     errx(1, "sysctlbyname(\"%s\")",
2011                         "net.inet.ip.dummynet.red_avg_pkt_size");
2012                 if (avg_pkt_size == 0)
2013                         errx(EX_DATAERR,
2014                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2015                             " be greater than zero");
2016
2017                 len = sizeof(struct clockinfo);
2018                 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
2019                         errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
2020
2021                 /*
2022                  * Ticks needed for sending a medium-sized packet.
2023                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2024                  * do not have bandwidth information, because that is stored
2025                  * in the parent pipe, and also we have multiple queues
2026                  * competing for it. So we set s=0, which is not very
2027                  * correct. But on the other hand, why do we want RED with
2028                  * WF2Q+ ?
2029                  */
2030                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2031                         s = 0;
2032                 else
2033                         s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
2034
2035                 /*
2036                  * max idle time (in ticks) before avg queue size becomes 0.
2037                  * NOTA:  (3/w_q) is approx the value x so that
2038                  * (1-w_q)^x < 10^-3.
2039                  */
2040                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2041                 idle = s * 3. / w_q;
2042                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2043                 if (!pipe.fs.lookup_step)
2044                         pipe.fs.lookup_step = 1;
2045                 weight = 1 - w_q;
2046                 for (t = pipe.fs.lookup_step; t > 0; --t)
2047                         weight *= weight;
2048                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2049         }
2050         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2051                             sizeof pipe);
2052         if (i)
2053                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2054 }
2055
2056 static void
2057 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2058 {
2059         int i, l;
2060
2061         for (i=0; i<6; i++)
2062                 addr[i] = mask[i] = 0;
2063         if (!strcmp(p, "any"))
2064                 return;
2065
2066         for (i=0; *p && i<6;i++, p++) {
2067                 addr[i] = strtol(p, &p, 16);
2068                 if (*p != ':') /* we start with the mask */
2069                         break;
2070         }
2071         if (*p == '/') { /* mask len */
2072                 l = strtol(p+1, &p, 0);
2073                 for (i=0; l>0; l -=8, i++)
2074                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2075         } else if (*p == '&') { /* mask */
2076                 for (i=0, p++; *p && i<6;i++, p++) {
2077                         mask[i] = strtol(p, &p, 16);
2078                         if (*p != ':')
2079                                 break;
2080                 }
2081         } else if (*p == '\0') {
2082                 for (i=0; i<6; i++)
2083                         mask[i] = 0xff;
2084         }
2085         for (i=0; i<6; i++)
2086                 addr[i] &= mask[i];
2087 }
2088
2089 /*
2090  * helper function, updates the pointer to cmd with the length
2091  * of the current command, and also cleans up the first word of
2092  * the new command in case it has been clobbered before.
2093  */
2094 static ipfw_insn *
2095 next_cmd(ipfw_insn *cmd)
2096 {
2097         cmd += F_LEN(cmd);
2098         bzero(cmd, sizeof(*cmd));
2099         return cmd;
2100 }
2101
2102 /*
2103  * A function to fill simple commands of size 1.
2104  * Existing flags are preserved.
2105  */
2106 static void
2107 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2108 {
2109         cmd->opcode = opcode;
2110         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2111         cmd->arg1 = arg;
2112 }
2113
2114 /*
2115  * Fetch and add the MAC address and type, with masks. This generates one or
2116  * two microinstructions, and returns the pointer to the last one.
2117  */
2118 static ipfw_insn *
2119 add_mac(ipfw_insn *cmd, int ac, char *av[])
2120 {
2121         ipfw_insn_mac *mac; /* also *src */
2122
2123         if (ac <3)
2124                 errx(EX_DATAERR, "MAC dst src type");
2125
2126         cmd->opcode = O_MACADDR2;
2127         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2128
2129         mac = (ipfw_insn_mac *)cmd;
2130         get_mac_addr_mask(av[0], mac->addr, mac->mask);         /* dst */
2131         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2132         av += 2;
2133
2134         if (strcmp(av[0], "any") != 0) {        /* we have a non-null port */
2135                 cmd += F_LEN(cmd);
2136
2137                 fill_newports((ipfw_insn_u16 *)cmd, av[0], IPPROTO_ETHERTYPE);
2138                 cmd->opcode = O_MAC_TYPE;
2139         }
2140
2141         return cmd;
2142 }
2143
2144 /*
2145  * Parse arguments and assemble the microinstructions which make up a rule.
2146  * Rules are added into the 'rulebuf' and then copied in the correct order
2147  * into the actual rule.
2148  *
2149  * The syntax for a rule starts with the action, followed by an
2150  * optional log action, and the various match patterns.
2151  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2152  * (generated if the rule includes a keep-state option), then the
2153  * various match patterns, the "log" action, and the actual action.
2154  *
2155  */
2156 static void
2157 add(int ac, char *av[])
2158 {
2159         /*
2160          * rules are added into the 'rulebuf' and then copied in
2161          * the correct order into the actual rule.
2162          * Some things that need to go out of order (prob, action etc.)
2163          * go into actbuf[].
2164          */
2165         static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
2166
2167         ipfw_insn *src, *dst, *cmd, *action, *prev;
2168
2169         struct ip_fw *rule;
2170
2171         /*
2172          * various flags used to record that we entered some fields.
2173          */
2174         int have_mac = 0;       /* set if we have a MAC address */
2175         int have_state = 0;     /* check-state or keep-state */
2176
2177         int i;
2178
2179         int open_par = 0;       /* open parenthesis ( */
2180
2181         /* proto is here because it is used to fetch ports */
2182         u_char proto = IPPROTO_IP;      /* default protocol */
2183
2184         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2185         bzero(cmdbuf, sizeof(cmdbuf));
2186         bzero(rulebuf, sizeof(rulebuf));
2187
2188         rule = (struct ip_fw *)rulebuf;
2189         cmd = (ipfw_insn *)cmdbuf;
2190         action = (ipfw_insn *)actbuf;
2191
2192         av++; ac--;
2193
2194         /* [rule N]     -- Rule number optional */
2195         if (ac && isdigit(**av)) {
2196                 rule->rulenum = atoi(*av);
2197                 av++;
2198                 ac--;
2199         }
2200
2201         /* [prob D]     -- match probability, optional */
2202         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2203                 double d = strtod(av[1], NULL);
2204
2205                 if (d <= 0 || d > 1)
2206                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2207                 if (d != 1) { /* 1 means always match */
2208                         action->opcode = O_PROB;
2209                         action->len = 2;
2210                         *((int32_t *)(action+1)) =
2211                                 (int32_t)((1 - d) * 0x7fffffff);
2212                         action += action->len;
2213                 }
2214                 av += 2; ac -= 2;
2215         }
2216
2217         /* action       -- mandatory */
2218         NEED1("missing action");
2219         i = match_token(rule_actions, *av);
2220         ac--; av++;
2221         action->len = 1;        /* default */
2222         switch(i) {
2223         case TOK_CHECKSTATE:
2224                 have_state = 1;
2225                 action->opcode = O_CHECK_STATE;
2226                 break;
2227
2228         case TOK_ACCEPT:
2229                 action->opcode = O_ACCEPT;
2230                 break;
2231
2232         case TOK_DENY:
2233                 action->opcode = O_DENY;
2234                 break;
2235
2236         case TOK_COUNT:
2237                 action->opcode = O_COUNT;
2238                 break;
2239
2240         case TOK_QUEUE:
2241         case TOK_PIPE:
2242                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2243         case TOK_SKIPTO:
2244                 if (i == TOK_QUEUE)
2245                         action->opcode = O_QUEUE;
2246                 else if (i == TOK_PIPE)
2247                         action->opcode = O_PIPE;
2248                 else if (i == TOK_SKIPTO)
2249                         action->opcode = O_SKIPTO;
2250                 NEED1("missing skipto/pipe/queue number");
2251                 action->arg1 = strtoul(*av, NULL, 10);
2252                 av++; ac--;
2253                 break;
2254
2255         case TOK_DIVERT:
2256         case TOK_TEE:
2257                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2258                 NEED1("missing divert/tee port");
2259                 action->arg1 = strtoul(*av, NULL, 0);
2260                 if (action->arg1 == 0) {
2261                         struct servent *s;
2262                         setservent(1);
2263                         s = getservbyname(av[0], "divert");
2264                         if (s != NULL)
2265                                 action->arg1 = ntohs(s->s_port);
2266                         else
2267                                 errx(EX_DATAERR, "illegal divert/tee port");
2268                 }
2269                 ac--; av++;
2270                 break;
2271
2272         case TOK_FORWARD: {
2273                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2274                 char *s, *end;
2275
2276                 NEED1("missing forward address[:port]");
2277
2278                 action->opcode = O_FORWARD_IP;
2279                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2280
2281                 p->sa.sin_len = sizeof(struct sockaddr_in);
2282                 p->sa.sin_family = AF_INET;
2283                 p->sa.sin_port = 0;
2284                 /*
2285                  * locate the address-port separator (':' or ',')
2286                  */
2287                 s = strchr(*av, ':');
2288                 if (s == NULL)
2289                         s = strchr(*av, ',');
2290                 if (s != NULL) {
2291                         *(s++) = '\0';
2292                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2293                         if (s == end)
2294                                 errx(EX_DATAERR,
2295                                     "illegal forwarding port ``%s''", s);
2296                         p->sa.sin_port = htons( (u_short)i );
2297                 }
2298                 lookup_host(*av, &(p->sa.sin_addr));
2299                 }
2300                 ac--; av++;
2301                 break;
2302
2303         default:
2304                 errx(EX_DATAERR, "invalid action %s\n", *av);
2305         }
2306         action = next_cmd(action);
2307
2308 #if 0
2309         } else if (!strncmp(*av, "reject", strlen(*av))) {
2310                 rule.fw_flg |= IP_FW_F_REJECT; av++; ac--;
2311                 rule.fw_reject_code = ICMP_UNREACH_HOST;
2312         } else if (!strncmp(*av, "reset", strlen(*av))) {
2313                 rule.fw_flg |= IP_FW_F_REJECT; av++; ac--;
2314                 rule.fw_reject_code = ICMP_REJECT_RST;  /* check TCP later */
2315         } else if (!strncmp(*av, "unreach", strlen(*av))) {
2316                 rule.fw_flg |= IP_FW_F_REJECT; av++; ac--;
2317                 fill_reject_code(&rule.fw_reject_code, *av); av++; ac--;
2318         }
2319 #endif /* XXX other actions */
2320
2321         /*
2322          * [log [logamount N]]  -- log, optional
2323          *
2324          * If exists, it goes first in the cmdbuf, but then it is
2325          * skipped in the copy section to the end of the buffer.
2326          */
2327         if (ac && !strncmp(*av, "log", strlen(*av))) {
2328                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2329
2330                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2331                 cmd->opcode = O_LOG;
2332                 av++; ac--;
2333                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2334                         ac--; av++;
2335                         NEED1("logamount requires argument");
2336                         c->max_log = atoi(*av);
2337                         if (c->max_log < 0)
2338                                 errx(EX_DATAERR, "logamount must be positive");
2339                         ac--; av++;
2340                 }
2341                 cmd = next_cmd(cmd);
2342         }
2343
2344         if (have_state) {
2345                 have_state = 0;
2346                 goto done;
2347         }
2348
2349 #define OR_START(target)                                        \
2350         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2351                 if (open_par)                                   \
2352                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2353                 open_par = 1;                                   \
2354                 if ( (av[0])[1] == '\0') {                      \
2355                         ac--; av++;                             \
2356                 } else                                          \
2357                         (*av)++;                                \
2358         }                                                       \
2359         target:                                                 \
2360
2361
2362 #define CLOSE_PAR                                               \
2363         if (open_par) {                                         \
2364                 if (ac && (                                     \
2365                     !strncmp(*av, ")", strlen(*av)) ||          \
2366                     !strncmp(*av, "}", strlen(*av)) )) {        \
2367                         open_par = 0;                           \
2368                         ac--; av++;                             \
2369                 } else                                          \
2370                         errx(EX_USAGE, "missing \")\"\n");      \
2371         }
2372
2373 #define NOT_BLOCK                                               \
2374         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2375                 if (cmd->len & F_NOT)                           \
2376                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2377                 cmd->len |= F_NOT;                              \
2378                 ac--; av++;                                     \
2379         }
2380
2381 #define OR_BLOCK(target)                                        \
2382         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2383                 if (prev == NULL || open_par == 0)              \
2384                         errx(EX_DATAERR, "invalid OR block");   \
2385                 prev->len |= F_OR;                              \
2386                 ac--; av++;                                     \
2387                 goto target;                                    \
2388         }                                                       \
2389         CLOSE_PAR;
2390
2391         /*
2392          * protocol, mandatory
2393          */
2394     OR_START(get_proto);
2395         NOT_BLOCK;
2396         NEED1("missing protocol");
2397         {
2398         struct protoent *pe;
2399
2400         if (!strncmp(*av, "all", strlen(*av)))
2401                 ; /* same as "ip" */
2402         else if (!strncmp(*av, "MAC", strlen(*av))) {
2403                 /* need exactly 3 fields */
2404                 cmd = add_mac(cmd, ac-1, av+1); /* exits in case of errors */
2405                 ac -= 3;
2406                 av += 3;
2407                 have_mac = 1;
2408         } else if ((proto = atoi(*av)) > 0)
2409                 ; /* all done! */
2410         else if ((pe = getprotobyname(*av)) != NULL)
2411                 proto = pe->p_proto;
2412         else
2413                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2414         av++; ac--;
2415         if (proto != IPPROTO_IP)
2416                 fill_cmd(cmd, O_PROTO, 0, proto);
2417         }
2418         cmd = next_cmd(cmd);
2419     OR_BLOCK(get_proto);
2420
2421         /*
2422          * "from", mandatory (unless we have a MAC address)
2423          */
2424         if (!ac || strncmp(*av, "from", strlen(*av))) {
2425                 if (have_mac)   /* we do not need a "to" address */
2426                         goto read_to;
2427                 errx(EX_USAGE, "missing ``from''");
2428         }
2429         ac--; av++;
2430
2431         /*
2432          * source IP, mandatory
2433          */
2434     OR_START(source_ip);
2435         NOT_BLOCK;      /* optional "not" */
2436         NEED1("missing source address");
2437
2438         /* source       -- mandatory */
2439         fill_ip((ipfw_insn_ip *)cmd, *av);
2440         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2441                 cmd->opcode = O_IP_SRC_SET;
2442         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2443                 cmd->opcode = O_IP_SRC_ME;
2444         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2445                 cmd->opcode = O_IP_SRC;
2446         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2447                 cmd->opcode = O_IP_SRC_MASK;
2448         /* otherwise len will be zero and the command skipped */
2449         ac--; av++;
2450         prev = cmd; /* in case we need to backtrack */
2451         cmd = next_cmd(cmd);
2452     OR_BLOCK(source_ip);
2453
2454         /*
2455          * source ports, optional
2456          */
2457         NOT_BLOCK;      /* optional "not" */
2458         if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
2459                 /* XXX todo: check that we have a protocol with ports */
2460                 cmd->opcode = O_IP_SRCPORT;
2461                 ac--;
2462                 av++;
2463                 cmd = next_cmd(cmd);
2464         }
2465
2466 read_to:
2467         /*
2468          * "to", mandatory (unless we have a MAC address
2469          */
2470         if (!ac || strncmp(*av, "to", strlen(*av))) {
2471                 if (have_mac)
2472                         goto read_options;
2473                 errx(EX_USAGE, "missing ``to''");
2474         }
2475         av++; ac--;
2476
2477         /*
2478          * destination, mandatory
2479          */
2480     OR_START(dest_ip);
2481         NOT_BLOCK;      /* optional "not" */
2482         NEED1("missing dst address");
2483         fill_ip((ipfw_insn_ip *)cmd, *av);
2484         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2485                 ;
2486         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2487                 cmd->opcode = O_IP_DST_ME;
2488         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2489                 cmd->opcode = O_IP_DST;
2490         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2491                 cmd->opcode = O_IP_DST_MASK;
2492         ac--;
2493         av++;
2494         prev = cmd;
2495         cmd = next_cmd(cmd);
2496     OR_BLOCK(dest_ip);
2497
2498         /*
2499          * dest. ports, optional
2500          */
2501         NOT_BLOCK;      /* optional "not" */
2502         if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
2503                 /* XXX todo: check that we have a protocol with ports */
2504                 cmd->opcode = O_IP_DSTPORT;
2505                 ac--;
2506                 av++;
2507                 cmd += F_LEN(cmd);
2508         }
2509
2510 read_options:
2511         prev = NULL;
2512         while (ac) {
2513                 char *s = *av;
2514                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;    /* alias */
2515
2516                 if (*s == '!') {        /* alternate syntax for NOT */
2517                         if (cmd->len & F_NOT)
2518                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2519                         cmd->len = F_NOT;
2520                         s++;
2521                 }
2522                 i = match_token(rule_options, s);
2523                 ac--; av++;
2524                 switch(i) {
2525                 case TOK_NOT:
2526                         if (cmd->len & F_NOT)
2527                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2528                         cmd->len = F_NOT;
2529                         break;
2530
2531                 case TOK_OR:
2532                         if (prev == NULL)
2533                                 errx(EX_USAGE, "invalid \"or\" block\n");
2534                         prev->len |= F_OR;
2535                         break;
2536
2537                 case TOK_IN:
2538                         fill_cmd(cmd, O_IN, 0, 0);
2539                         break;
2540
2541                 case TOK_OUT:
2542                         cmd->len ^= F_NOT; /* toggle F_NOT */
2543                         fill_cmd(cmd, O_IN, 0, 0);
2544                         break;
2545
2546                 case TOK_FRAG:
2547                         fill_cmd(cmd, O_FRAG, 0, 0);
2548                         break;
2549
2550                 case TOK_LAYER2:
2551                         fill_cmd(cmd, O_LAYER2, 0, 0);
2552                         break;
2553
2554                 case TOK_XMIT:
2555                 case TOK_RECV:
2556                 case TOK_VIA:
2557                         NEED1("recv, xmit, via require interface name"
2558                                 " or address");
2559                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2560                         ac--; av++;
2561                         if (F_LEN(cmd) == 0)    /* not a valid address */
2562                                 break;
2563                         if (i == TOK_XMIT)
2564                                 cmd->opcode = O_XMIT;
2565                         else if (i == TOK_RECV)
2566                                 cmd->opcode = O_RECV;
2567                         else if (i == TOK_VIA)
2568                                 cmd->opcode = O_VIA;
2569                         break;
2570
2571                 case TOK_IPTTL:
2572                         NEED1("ipttl requires TTL");
2573                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2574                         ac--; av++;
2575                         break;
2576
2577                 case TOK_IPID:
2578                         NEED1("ipid requires length");
2579                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2580                         ac--; av++;
2581                         break;
2582
2583                 case TOK_IPLEN:
2584                         NEED1("iplen requires length");
2585                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2586                         ac--; av++;
2587                         break;
2588
2589                 case TOK_IPVER:
2590                         NEED1("ipver requires version");
2591                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2592                         ac--; av++;
2593                         break;
2594
2595                 case TOK_IPOPTS:
2596                         NEED1("missing argument for ipoptions");
2597                         fill_flags(cmd, O_IPOPTS, f_ipopts, *av);
2598                         ac--; av++;
2599                         break;
2600
2601                 case TOK_UID:
2602                         NEED1("uid requires argument");
2603                     {
2604                         char *end;
2605                         uid_t uid;
2606                         struct passwd *pwd;
2607
2608                         cmd->opcode = O_UID;
2609                         uid = strtoul(*av, &end, 0);
2610                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
2611                         if (pwd == NULL)
2612                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
2613                         cmd32->d[0] = uid;
2614                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2615                         ac--; av++;
2616                     }
2617                         break;
2618
2619                 case TOK_GID:
2620                         NEED1("gid requires argument");
2621                     {
2622                         char *end;
2623                         gid_t gid;
2624                         struct group *grp;
2625
2626                         cmd->opcode = O_GID;
2627                         gid = strtoul(*av, &end, 0);
2628                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
2629                         if (grp == NULL)
2630                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
2631
2632                         cmd32->d[0] = gid;
2633                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2634                         ac--; av++;
2635                     }
2636                         break;
2637
2638                 case TOK_ESTAB:
2639                         fill_cmd(cmd, O_ESTAB, 0, 0);
2640                         break;
2641
2642                 case TOK_SETUP:
2643                         fill_cmd(cmd, O_TCPFLAGS, 0,
2644                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
2645                         break;
2646
2647                 case TOK_TCPOPTS:
2648                         NEED1("missing argument for tcpoptions");
2649                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
2650                         ac--; av++;
2651                         break;
2652
2653                 case TOK_TCPSEQ:
2654                 case TOK_TCPACK:
2655                         NEED1("tcpseq/tcpack requires argument");
2656                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
2657                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
2658                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
2659                         ac--; av++;
2660                         break;
2661
2662                 case TOK_TCPWIN:
2663                         NEED1("tcpwin requires length");
2664                         fill_cmd(cmd, O_TCPWIN, 0,
2665                             htons(strtoul(*av, NULL, 0)));
2666                         ac--; av++;
2667                         break;
2668
2669                 case TOK_TCPFLAGS:
2670                         NEED1("missing argument for tcpflags");
2671                         cmd->opcode = O_TCPFLAGS;
2672                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
2673                         ac--; av++;
2674                         break;
2675
2676                 case TOK_KEEPSTATE:
2677                         have_state = 1;
2678                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
2679                         break;
2680
2681                 case TOK_LIMIT:
2682                         NEED1("limit needs mask and # of connections");
2683                     {
2684                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
2685
2686                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
2687                         cmd->opcode = O_LIMIT;
2688                         c->limit_mask = 0;
2689                         c->conn_limit = 0;
2690                         for (; ac >1 ;) {
2691                                 int val;
2692
2693                                 val = match_token(limit_masks, *av);
2694                                 if (val <= 0)
2695                                         break;
2696                                 c->limit_mask |= val;
2697                                 ac--; av++;
2698                         }
2699                         c->conn_limit = atoi(*av);
2700                         if (c->conn_limit == 0)
2701                                 errx(EX_USAGE, "limit: limit must be >0");
2702                         if (c->limit_mask == 0)
2703                                 errx(EX_USAGE, "missing limit mask");
2704                         ac--; av++;
2705                         have_state = 1;
2706                     }
2707                         break;
2708
2709                 default:
2710                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
2711                 }
2712                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
2713                         prev = cmd;
2714                         cmd = next_cmd(cmd);
2715                 }
2716         }
2717 #if 0 /* XXX todo */
2718 do_options:
2719         while (ac) {
2720                 } else if (!strncmp(*av, "ipprecedence", strlen(*av))) {
2721                         u_long ippre;
2722                         char *c;
2723
2724                         av++; ac--;
2725                         NEED1("missing argument for ``ipprecedence''");
2726                         ippre = strtoul(*av, &c, 0);
2727                         if (*c != '\0')
2728                                 errx(EX_DATAERR, "argument to ipprecedence"
2729                                         " must be numeric");
2730                         if (ippre > 7)
2731                                 errx(EX_DATAERR, "argument to ipprecedence"
2732                                         " out of range");
2733                         rule.fw_ipflg |= IP_FW_IF_IPPRE;
2734                         rule.fw_iptos |= (u_short)(ippre << 5);
2735                         av++; ac--;
2736                 } else if (!strncmp(*av, "iptos", strlen(*av))) {
2737                         av++; ac--;
2738                         NEED1("missing argument for ``iptos''");
2739                         rule.fw_ipflg |= IP_FW_IF_IPTOS;
2740                         fill_flags(&rule.fw_iptos, &rule.fw_ipntos,
2741                             f_iptos, av);
2742                         av++; ac--;
2743                 } else if (rule.fw_prot == IPPROTO_ICMP) {
2744                         if (!strncmp(*av, "icmptypes", strlen(*av))) {
2745                                 av++; ac--;
2746                                 NEED1("missing argument for ``icmptypes''");
2747                                 fill_icmptypes(rule.fw_uar.fw_icmptypes,
2748                                     av, &rule.fw_flg);
2749                                 av++; ac--;
2750                         }
2751                 }
2752         }
2753 #endif /* XXX todo */
2754 done:
2755         /*
2756          * Now copy stuff into the rule.
2757          * If we have a keep-state option, the first instruction
2758          * must be a PROBE_STATE (which is generated here).
2759          * If we have a LOG option, it was stored as the first command,
2760          * and now must be moved to the top of the action part.
2761          */
2762         dst = (ipfw_insn *)rule->cmd;
2763
2764         /*
2765          * generate O_PROBE_STATE if necessary
2766          */
2767         if (have_state) {
2768                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
2769                 dst = next_cmd(dst);
2770         }
2771         /*
2772          * copy all commands but O_LOG
2773          */
2774         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
2775                 i = F_LEN(src);
2776
2777                 if (src->opcode != O_LOG) {
2778                         bcopy(src, dst, i * sizeof(u_int32_t));
2779                         dst += i;
2780                 }
2781         }
2782
2783         /*
2784          * start action section
2785          */
2786         rule->act_ofs = dst - rule->cmd;
2787
2788         /*
2789          * put back O_LOG if necessary
2790          */
2791         src = (ipfw_insn *)cmdbuf;
2792         if ( src->opcode == O_LOG ) {
2793                 i = F_LEN(src);
2794                 bcopy(src, dst, i * sizeof(u_int32_t));
2795                 dst += i;
2796         }
2797         /*
2798          * copy all other actions
2799          */
2800         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
2801                 i = F_LEN(src);
2802                 bcopy(src, dst, i * sizeof(u_int32_t));
2803                 dst += i;
2804         }
2805
2806         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
2807         i = (void *)dst - (void *)rule;
2808         if (!do_quiet)
2809                 show_ipfw(rule);
2810         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
2811                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
2812         if (!do_quiet)
2813                 show_ipfw(rule);
2814 }
2815
2816 static void
2817 zero (int ac, char *av[])
2818 {
2819         int rulenum;
2820         int failed = EX_OK;
2821
2822         av++; ac--;
2823
2824         if (!ac) {
2825                 /* clear all entries */
2826                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
2827                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
2828                 if (!do_quiet)
2829                         printf("Accounting cleared.\n");
2830
2831                 return;
2832         }
2833
2834         while (ac) {
2835                 /* Rule number */
2836                 if (isdigit(**av)) {
2837                         rulenum = atoi(*av);
2838                         av++;
2839                         ac--;
2840                         if (setsockopt(s, IPPROTO_IP,
2841                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
2842                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
2843                                     rulenum);
2844                                 failed = EX_UNAVAILABLE;
2845                         } else if (!do_quiet)
2846                                 printf("Entry %d cleared\n", rulenum);
2847                 } else {
2848                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
2849                 }
2850         }
2851         if (failed != EX_OK)
2852                 exit(failed);
2853 }
2854
2855 static void
2856 resetlog (int ac, char *av[])
2857 {
2858         int rulenum;
2859         int failed = EX_OK;
2860
2861         av++; ac--;
2862
2863         if (!ac) {
2864                 /* clear all entries */
2865                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
2866                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
2867                 if (!do_quiet)
2868                         printf("Logging counts reset.\n");
2869
2870                 return;
2871         }
2872
2873         while (ac) {
2874                 /* Rule number */
2875                 if (isdigit(**av)) {
2876                         rulenum = atoi(*av);
2877                         av++;
2878                         ac--;
2879                         if (setsockopt(s, IPPROTO_IP,
2880                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
2881                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
2882                                     rulenum);
2883                                 failed = EX_UNAVAILABLE;
2884                         } else if (!do_quiet)
2885                                 printf("Entry %d logging count reset\n",
2886                                     rulenum);
2887                 } else {
2888                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
2889                 }
2890         }
2891         if (failed != EX_OK)
2892                 exit(failed);
2893 }
2894
2895 static void
2896 flush()
2897 {
2898         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
2899
2900         if (!do_force && !do_quiet) { /* need to ask user */
2901                 int c;
2902
2903                 printf("Are you sure? [yn] ");
2904                 fflush(stdout);
2905                 do {
2906                         c = toupper(getc(stdin));
2907                         while (c != '\n' && getc(stdin) != '\n')
2908                                 if (feof(stdin))
2909                                         return; /* and do not flush */
2910                 } while (c != 'Y' && c != 'N');
2911                 printf("\n");
2912                 if (c == 'N')   /* user said no */
2913                         return;
2914         }
2915         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
2916                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
2917                     do_pipe ? "DUMMYNET" : "FW");
2918         if (!do_quiet)
2919                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
2920 }
2921
2922 static int
2923 ipfw_main(int ac, char **av)
2924 {
2925         int ch;
2926
2927         if (ac == 1)
2928                 show_usage();
2929
2930         /* Set the force flag for non-interactive processes */
2931         do_force = !isatty(STDIN_FILENO);
2932
2933         optind = optreset = 1;
2934         while ((ch = getopt(ac, av, "hs:adefNqtv")) != -1)
2935                 switch (ch) {
2936                 case 'h': /* help */
2937                         help();
2938                         break;  /* NOTREACHED */
2939
2940                 case 's': /* sort */
2941                         do_sort = atoi(optarg);
2942                         break;
2943                 case 'a':
2944                         do_acct = 1;
2945                         break;
2946                 case 'd':
2947                         do_dynamic = 1;
2948                         break;
2949                 case 'e':
2950                         do_expired = 1;
2951                         break;
2952                 case 'f':
2953                         do_force = 1;
2954                         break;
2955                 case 'N':
2956                         do_resolv = 1;
2957                         break;
2958                 case 'q':
2959                         do_quiet = 1;
2960                         break;
2961                 case 't':
2962                         do_time = 1;
2963                         break;
2964                 case 'v': /* verbose */
2965                         verbose++;
2966                         break;
2967                 default:
2968                         show_usage();
2969                 }
2970
2971         ac -= optind;
2972         av += optind;
2973         NEED1("bad arguments, for usage summary ``ipfw''");
2974
2975         /*
2976          * optional: pipe or queue
2977          */
2978         if (!strncmp(*av, "pipe", strlen(*av))) {
2979                 do_pipe = 1;
2980                 ac--;
2981                 av++;
2982         } else if (!strncmp(*av, "queue", strlen(*av))) {
2983                 do_pipe = 2;
2984                 ac--;
2985                 av++;
2986         }
2987         NEED1("missing command");
2988
2989         /*
2990          * for pipes and queues we normally say 'pipe NN config'
2991          * but the code is easier to parse as 'pipe config NN'
2992          * so we swap the two arguments.
2993          */
2994         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
2995                 char *p = av[0];
2996                 av[0] = av[1];
2997                 av[1] = p;
2998         }
2999         if (!strncmp(*av, "add", strlen(*av)))
3000                 add(ac, av);
3001         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
3002                 config_pipe(ac, av);
3003         else if (!strncmp(*av, "delete", strlen(*av)))
3004                 delete(ac, av);
3005         else if (!strncmp(*av, "flush", strlen(*av)))
3006                 flush();
3007         else if (!strncmp(*av, "zero", strlen(*av)))
3008                 zero(ac, av);
3009         else if (!strncmp(*av, "resetlog", strlen(*av)))
3010                 resetlog(ac, av);
3011         else if (!strncmp(*av, "print", strlen(*av)) ||
3012                  !strncmp(*av, "list", strlen(*av)))
3013                 list(ac, av);
3014         else if (!strncmp(*av, "show", strlen(*av))) {
3015                 do_acct++;
3016                 list(ac, av);
3017         } else
3018                 errx(EX_USAGE, "bad command `%s'", *av);
3019         return 0;
3020 }
3021
3022
3023 static void
3024 ipfw_readfile(int ac, char *av[])
3025 {
3026 #define MAX_ARGS        32
3027 #define WHITESP         " \t\f\v\n\r"
3028         char    buf[BUFSIZ];
3029         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3030         char    linename[10];
3031         int     i=0, lineno=0, qflag=0, pflag=0, status;
3032         FILE    *f = NULL;
3033         pid_t   preproc = 0;
3034         int     c;
3035
3036         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3037                 switch(c) {
3038                 case 'D':
3039                         if (!pflag)
3040                                 errx(EX_USAGE, "-D requires -p");
3041                         if (i > MAX_ARGS - 2)
3042                                 errx(EX_USAGE,
3043                                      "too many -D or -U options");
3044                         args[i++] = "-D";
3045                         args[i++] = optarg;
3046                         break;
3047
3048                 case 'U':
3049                         if (!pflag)
3050                                 errx(EX_USAGE, "-U requires -p");
3051                         if (i > MAX_ARGS - 2)
3052                                 errx(EX_USAGE,
3053                                      "too many -D or -U options");
3054                         args[i++] = "-U";
3055                         args[i++] = optarg;
3056                         break;
3057
3058                 case 'p':
3059                         pflag = 1;
3060                         cmd = optarg;
3061                         args[0] = cmd;
3062                         i = 1;
3063                         break;
3064
3065                 case 'q':
3066                         qflag = 1;
3067                         break;
3068
3069                 default:
3070                         errx(EX_USAGE, "bad arguments, for usage"
3071                              " summary ``ipfw''");
3072                 }
3073
3074         av += optind;
3075         ac -= optind;
3076         if (ac != 1)
3077                 errx(EX_USAGE, "extraneous filename arguments");
3078
3079         if ((f = fopen(av[0], "r")) == NULL)
3080                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3081
3082         if (pflag) {
3083                 /* pipe through preprocessor (cpp or m4) */
3084                 int pipedes[2];
3085
3086                 args[i] = 0;
3087
3088                 if (pipe(pipedes) == -1)
3089                         err(EX_OSERR, "cannot create pipe");
3090
3091                 switch((preproc = fork())) {
3092                 case -1:
3093                         err(EX_OSERR, "cannot fork");
3094
3095                 case 0:
3096                         /* child */
3097                         if (dup2(fileno(f), 0) == -1
3098                             || dup2(pipedes[1], 1) == -1)
3099                                 err(EX_OSERR, "dup2()");
3100                         fclose(f);
3101                         close(pipedes[1]);
3102                         close(pipedes[0]);
3103                         execvp(cmd, args);
3104                         err(EX_OSERR, "execvp(%s) failed", cmd);
3105
3106                 default:
3107                         /* parent */
3108                         fclose(f);
3109                         close(pipedes[1]);
3110                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3111                                 int savederrno = errno;
3112
3113                                 (void)kill(preproc, SIGTERM);
3114                                 errno = savederrno;
3115                                 err(EX_OSERR, "fdopen()");
3116                         }
3117                 }
3118         }
3119
3120         while (fgets(buf, BUFSIZ, f)) {
3121                 lineno++;
3122                 sprintf(linename, "Line %d", lineno);
3123                 args[0] = linename;
3124
3125                 if (*buf == '#')
3126                         continue;
3127                 if ((p = strchr(buf, '#')) != NULL)
3128                         *p = '\0';
3129                 i = 1;
3130                 if (qflag)
3131                         args[i++] = "-q";
3132                 for (a = strtok(buf, WHITESP);
3133                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3134                         args[i] = a;
3135                 if (i == (qflag? 2: 1))
3136                         continue;
3137                 if (i == MAX_ARGS)
3138                         errx(EX_USAGE, "%s: too many arguments",
3139                             linename);
3140                 args[i] = NULL;
3141
3142                 ipfw_main(i, args);
3143         }
3144         fclose(f);
3145         if (pflag) {
3146                 if (waitpid(preproc, &status, 0) == -1)
3147                         errx(EX_OSERR, "waitpid()");
3148                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3149                         errx(EX_UNAVAILABLE,
3150                             "preprocessor exited with status %d",
3151                             WEXITSTATUS(status));
3152                 else if (WIFSIGNALED(status))
3153                         errx(EX_UNAVAILABLE,
3154                             "preprocessor exited with signal %d",
3155                             WTERMSIG(status));
3156         }
3157 }
3158
3159 int
3160 main(int ac, char *av[])
3161 {
3162         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3163         if (s < 0)
3164                 err(EX_UNAVAILABLE, "socket");
3165
3166         setbuf(stdout, 0);
3167
3168         /*
3169          * If the last argument is an absolute pathname, interpret it
3170          * as a file to be preprocessed.
3171          */
3172
3173         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3174                 ipfw_readfile(ac, av);
3175         else
3176                 ipfw_main(ac, av);
3177         return EX_OK;
3178 }