sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002 Luigi Rizzo
   3  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
   4  * Copyright (c) 1994 Ugen J.S.Antsilevich
   5  *
   6  * Idea and grammar partially left from:
   7  * Copyright (c) 1993 Daniel Boulet
   8  *
   9  * Redistribution and use in source forms, with and without modification,
  10  * are permitted provided that this entire comment appears intact.
  11  *
  12  * Redistribution in binary form may occur without any restrictions.
  13  * Obviously, it would be nice if you gave credit where credit is due
  14  * but requiring it would be too onerous.
  15  *
  16  * This software is provided ``AS IS'' without any warranties of any kind.
  17  *
  18  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD: src/sbin/ipfw/ipfw2.c,v 1.4.2.13 2003/05/27 22:21:11 gshapiro Exp $
  21  * $DragonFly: src/sbin/ipfw/ipfw2.c,v 1.3 2003/08/08 04:18:39 dillon Exp $
  22  */
  23
  24 #include <sys/param.h>
  25 #include <sys/mbuf.h>
  26 #include <sys/socket.h>
  27 #include <sys/sockio.h>
  28 #include <sys/sysctl.h>
  29 #include <sys/time.h>
  30 #include <sys/wait.h>
  31
  32 #include <ctype.h>
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <grp.h>
  36 #include <limits.h>
  37 #include <netdb.h>
  38 #include <pwd.h>
  39 #include <signal.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <stdarg.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <sysexits.h>
  46
  47 #include <net/if.h>
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/ip_icmp.h>
  52 #include <net/ipfw/ip_fw.h>
  53 #include <net/route.h> /* def. of struct route */
  54 #include <net/dummynet/ip_dummynet.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57
  58 int             s,                      /* main RAW socket */
  59                 do_resolv,              /* Would try to resolve all */
  60                 do_acct,                /* Show packet/byte count */
  61                 do_time,                /* Show time stamps */
  62                 do_quiet,               /* Be quiet in add and flush */
  63                 do_force,               /* Don't ask for confirmation */
  64                 do_pipe,                /* this cmd refers to a pipe */
  65                 do_sort,                /* field to sort results (0 = no) */
  66                 do_dynamic,             /* display dynamic rules */
  67                 do_expired,             /* display expired dynamic rules */
  68                 do_compact,             /* show rules in compact mode */
  69                 show_sets,              /* display rule sets */
  70                 verbose;
  71
  72 #define IP_MASK_ALL     0xffffffff
  73
  74 /*
  75  * structure to hold flag names and associated values to be
  76  * set in the appropriate masks.
  77  * A NULL string terminates the array.
  78  * Often, an element with 0 value contains an error string.
  79  *
  80  */
  81 struct _s_x {
  82         char *s;
  83         int x;
  84 };
  85
  86 static struct _s_x f_tcpflags[] = {
  87         { "syn", TH_SYN },
  88         { "fin", TH_FIN },
  89         { "ack", TH_ACK },
  90         { "psh", TH_PUSH },
  91         { "rst", TH_RST },
  92         { "urg", TH_URG },
  93         { "tcp flag", 0 },
  94         { NULL, 0 }
  95 };
  96
  97 static struct _s_x f_tcpopts[] = {
  98         { "mss",        IP_FW_TCPOPT_MSS },
  99         { "maxseg",     IP_FW_TCPOPT_MSS },
 100         { "window",     IP_FW_TCPOPT_WINDOW },
 101         { "sack",       IP_FW_TCPOPT_SACK },
 102         { "ts",         IP_FW_TCPOPT_TS },
 103         { "timestamp",  IP_FW_TCPOPT_TS },
 104         { "cc",         IP_FW_TCPOPT_CC },
 105         { "tcp option", 0 },
 106         { NULL, 0 }
 107 };
 108
 109 /*
 110  * IP options span the range 0 to 255 so we need to remap them
 111  * (though in fact only the low 5 bits are significant).
 112  */
 113 static struct _s_x f_ipopts[] = {
 114         { "ssrr",       IP_FW_IPOPT_SSRR},
 115         { "lsrr",       IP_FW_IPOPT_LSRR},
 116         { "rr",         IP_FW_IPOPT_RR},
 117         { "ts",         IP_FW_IPOPT_TS},
 118         { "ip option",  0 },
 119         { NULL, 0 }
 120 };
 121
 122 static struct _s_x f_iptos[] = {
 123         { "lowdelay",   IPTOS_LOWDELAY},
 124         { "throughput", IPTOS_THROUGHPUT},
 125         { "reliability", IPTOS_RELIABILITY},
 126         { "mincost",    IPTOS_MINCOST},
 127         { "congestion", IPTOS_CE},
 128         { "ecntransport", IPTOS_ECT},
 129         { "ip tos option", 0},
 130         { NULL, 0 }
 131 };
 132
 133 static struct _s_x limit_masks[] = {
 134         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 135         {"src-addr",    DYN_SRC_ADDR},
 136         {"src-port",    DYN_SRC_PORT},
 137         {"dst-addr",    DYN_DST_ADDR},
 138         {"dst-port",    DYN_DST_PORT},
 139         {NULL,          0}
 140 };
 141
 142 /*
 143  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 144  * This is only used in this code.
 145  */
 146 #define IPPROTO_ETHERTYPE       0x1000
 147 static struct _s_x ether_types[] = {
 148     /*
 149      * Note, we cannot use "-:&/" in the names because they are field
 150      * separators in the type specifications. Also, we use s = NULL as
 151      * end-delimiter, because a type of 0 can be legal.
 152      */
 153         { "ip",         0x0800 },
 154         { "ipv4",       0x0800 },
 155         { "ipv6",       0x86dd },
 156         { "arp",        0x0806 },
 157         { "rarp",       0x8035 },
 158         { "vlan",       0x8100 },
 159         { "loop",       0x9000 },
 160         { "trail",      0x1000 },
 161         { "at",         0x809b },
 162         { "atalk",      0x809b },
 163         { "aarp",       0x80f3 },
 164         { "pppoe_disc", 0x8863 },
 165         { "pppoe_sess", 0x8864 },
 166         { "ipx_8022",   0x00E0 },
 167         { "ipx_8023",   0x0000 },
 168         { "ipx_ii",     0x8137 },
 169         { "ipx_snap",   0x8137 },
 170         { "ipx",        0x8137 },
 171         { "ns",         0x0600 },
 172         { NULL,         0 }
 173 };
 174
 175 static void show_usage(void);
 176
 177 enum tokens {
 178         TOK_NULL=0,
 179
 180         TOK_OR,
 181         TOK_NOT,
 182         TOK_STARTBRACE,
 183         TOK_ENDBRACE,
 184
 185         TOK_ACCEPT,
 186         TOK_COUNT,
 187         TOK_PIPE,
 188         TOK_QUEUE,
 189         TOK_DIVERT,
 190         TOK_TEE,
 191         TOK_FORWARD,
 192         TOK_SKIPTO,
 193         TOK_DENY,
 194         TOK_REJECT,
 195         TOK_RESET,
 196         TOK_UNREACH,
 197         TOK_CHECKSTATE,
 198
 199         TOK_UID,
 200         TOK_GID,
 201         TOK_IN,
 202         TOK_LIMIT,
 203         TOK_KEEPSTATE,
 204         TOK_LAYER2,
 205         TOK_OUT,
 206         TOK_XMIT,
 207         TOK_RECV,
 208         TOK_VIA,
 209         TOK_FRAG,
 210         TOK_IPOPTS,
 211         TOK_IPLEN,
 212         TOK_IPID,
 213         TOK_IPPRECEDENCE,
 214         TOK_IPTOS,
 215         TOK_IPTTL,
 216         TOK_IPVER,
 217         TOK_ESTAB,
 218         TOK_SETUP,
 219         TOK_TCPFLAGS,
 220         TOK_TCPOPTS,
 221         TOK_TCPSEQ,
 222         TOK_TCPACK,
 223         TOK_TCPWIN,
 224         TOK_ICMPTYPES,
 225         TOK_MAC,
 226         TOK_MACTYPE,
 227
 228         TOK_PLR,
 229         TOK_NOERROR,
 230         TOK_BUCKETS,
 231         TOK_DSTIP,
 232         TOK_SRCIP,
 233         TOK_DSTPORT,
 234         TOK_SRCPORT,
 235         TOK_ALL,
 236         TOK_MASK,
 237         TOK_BW,
 238         TOK_DELAY,
 239         TOK_RED,
 240         TOK_GRED,
 241         TOK_DROPTAIL,
 242         TOK_PROTO,
 243         TOK_WEIGHT,
 244 };
 245
 246 struct _s_x dummynet_params[] = {
 247         { "plr",                TOK_PLR },
 248         { "noerror",            TOK_NOERROR },
 249         { "buckets",            TOK_BUCKETS },
 250         { "dst-ip",             TOK_DSTIP },
 251         { "src-ip",             TOK_SRCIP },
 252         { "dst-port",           TOK_DSTPORT },
 253         { "src-port",           TOK_SRCPORT },
 254         { "proto",              TOK_PROTO },
 255         { "weight",             TOK_WEIGHT },
 256         { "all",                TOK_ALL },
 257         { "mask",               TOK_MASK },
 258         { "droptail",           TOK_DROPTAIL },
 259         { "red",                TOK_RED },
 260         { "gred",               TOK_GRED },
 261         { "bw",                 TOK_BW },
 262         { "bandwidth",          TOK_BW },
 263         { "delay",              TOK_DELAY },
 264         { "pipe",               TOK_PIPE },
 265         { "queue",              TOK_QUEUE },
 266         { "dummynet-params",    TOK_NULL },
 267         { NULL, 0 }
 268 };
 269
 270 struct _s_x rule_actions[] = {
 271         { "accept",             TOK_ACCEPT },
 272         { "pass",               TOK_ACCEPT },
 273         { "allow",              TOK_ACCEPT },
 274         { "permit",             TOK_ACCEPT },
 275         { "count",              TOK_COUNT },
 276         { "pipe",               TOK_PIPE },
 277         { "queue",              TOK_QUEUE },
 278         { "divert",             TOK_DIVERT },
 279         { "tee",                TOK_TEE },
 280         { "fwd",                TOK_FORWARD },
 281         { "forward",            TOK_FORWARD },
 282         { "skipto",             TOK_SKIPTO },
 283         { "deny",               TOK_DENY },
 284         { "drop",               TOK_DENY },
 285         { "reject",             TOK_REJECT },
 286         { "reset",              TOK_RESET },
 287         { "unreach",            TOK_UNREACH },
 288         { "check-state",        TOK_CHECKSTATE },
 289         { NULL,                 TOK_NULL },
 290         { NULL, 0 }
 291 };
 292
 293 struct _s_x rule_options[] = {
 294         { "uid",                TOK_UID },
 295         { "gid",                TOK_GID },
 296         { "in",                 TOK_IN },
 297         { "limit",              TOK_LIMIT },
 298         { "keep-state",         TOK_KEEPSTATE },
 299         { "bridged",            TOK_LAYER2 },
 300         { "layer2",             TOK_LAYER2 },
 301         { "out",                TOK_OUT },
 302         { "xmit",               TOK_XMIT },
 303         { "recv",               TOK_RECV },
 304         { "via",                TOK_VIA },
 305         { "fragment",           TOK_FRAG },
 306         { "frag",               TOK_FRAG },
 307         { "ipoptions",          TOK_IPOPTS },
 308         { "ipopts",             TOK_IPOPTS },
 309         { "iplen",              TOK_IPLEN },
 310         { "ipid",               TOK_IPID },
 311         { "ipprecedence",       TOK_IPPRECEDENCE },
 312         { "iptos",              TOK_IPTOS },
 313         { "ipttl",              TOK_IPTTL },
 314         { "ipversion",          TOK_IPVER },
 315         { "ipver",              TOK_IPVER },
 316         { "estab",              TOK_ESTAB },
 317         { "established",        TOK_ESTAB },
 318         { "setup",              TOK_SETUP },
 319         { "tcpflags",           TOK_TCPFLAGS },
 320         { "tcpflgs",            TOK_TCPFLAGS },
 321         { "tcpoptions",         TOK_TCPOPTS },
 322         { "tcpopts",            TOK_TCPOPTS },
 323         { "tcpseq",             TOK_TCPSEQ },
 324         { "tcpack",             TOK_TCPACK },
 325         { "tcpwin",             TOK_TCPWIN },
 326         { "icmptype",           TOK_ICMPTYPES },
 327         { "icmptypes",          TOK_ICMPTYPES },
 328         { "dst-ip",             TOK_DSTIP },
 329         { "src-ip",             TOK_SRCIP },
 330         { "dst-port",           TOK_DSTPORT },
 331         { "src-port",           TOK_SRCPORT },
 332         { "proto",              TOK_PROTO },
 333         { "MAC",                TOK_MAC },
 334         { "mac",                TOK_MAC },
 335         { "mac-type",           TOK_MACTYPE },
 336
 337         { "not",                TOK_NOT },              /* pseudo option */
 338         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 339         { "or",                 TOK_OR },               /* pseudo option */
 340         { "|", /* escape */     TOK_OR },               /* pseudo option */
 341         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 342         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 343         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 344         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 345         { NULL,                 TOK_NULL },
 346         { NULL, 0 }
 347 };
 348
 349 /**
 350  * match_token takes a table and a string, returns the value associated
 351  * with the string (0 meaning an error in most cases)
 352  */
 353 static int
 354 match_token(struct _s_x *table, char *string)
 355 {
 356         struct _s_x *pt;
 357         int i = strlen(string);
 358
 359         for (pt = table ; i && pt->s != NULL ; pt++)
 360                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 361                         return pt->x;
 362         return -1;
 363 };
 364
 365 static char *
 366 match_value(struct _s_x *p, u_int32_t value)
 367 {
 368         for (; p->s != NULL; p++)
 369                 if (p->x == value)
 370                         return p->s;
 371         return NULL;
 372 }
 373
 374 /*
 375  * prints one port, symbolic or numeric
 376  */
 377 static void
 378 print_port(int proto, u_int16_t port)
 379 {
 380
 381         if (proto == IPPROTO_ETHERTYPE) {
 382                 char *s;
 383
 384                 if (do_resolv && (s = match_value(ether_types, port)) )
 385                         printf("%s", s);
 386                 else
 387                         printf("0x%04x", port);
 388         } else {
 389                 struct servent *se = NULL;
 390                 if (do_resolv) {
 391                         struct protoent *pe = getprotobynumber(proto);
 392
 393                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 394                 }
 395                 if (se)
 396                         printf("%s", se->s_name);
 397                 else
 398                         printf("%d", port);
 399         }
 400 }
 401
 402 /*
 403  * print the values in a list of ports
 404  * XXX todo: add support for mask.
 405  */
 406 static void
 407 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 408 {
 409         u_int16_t *p = cmd->ports;
 410         int i;
 411         char *sep= " ";
 412
 413         if (cmd->o.len & F_NOT)
 414                 printf(" not");
 415         if (opcode != 0)
 416                 printf ("%s", opcode == O_MAC_TYPE ? " mac-type" :
 417                     (opcode == O_IP_DSTPORT ? " dst-port" : " src-port"));
 418         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 419                 printf(sep);
 420                 print_port(proto, p[0]);
 421                 if (p[0] != p[1]) {
 422                         printf("-");
 423                         print_port(proto, p[1]);
 424                 }
 425                 sep = ",";
 426         }
 427 }
 428
 429 /*
 430  * Like strtol, but also translates service names into port numbers
 431  * for some protocols.
 432  * In particular:
 433  *      proto == -1 disables the protocol check;
 434  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 435  *      proto == <some value in /etc/protocols> matches the values there.
 436  * Returns *end == s in case the parameter is not found.
 437  */
 438 static int
 439 strtoport(char *s, char **end, int base, int proto)
 440 {
 441         char *p, *buf;
 442         char *s1;
 443         int i;
 444
 445         *end = s;               /* default - not found */
 446         if ( *s == '\0')
 447                 return 0;       /* not found */
 448
 449         if (isdigit(*s))
 450                 return strtol(s, end, base);
 451
 452         /*
 453          * find separator. '\\' escapes the next char.
 454          */
 455         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 456                 if (*s1 == '\\' && s1[1] != '\0')
 457                         s1++;
 458
 459         buf = malloc(s1 - s + 1);
 460         if (buf == NULL)
 461                 return 0;
 462
 463         /*
 464          * copy into a buffer skipping backslashes
 465          */
 466         for (p = s, i = 0; p != s1 ; p++)
 467                 if ( *p != '\\')
 468                         buf[i++] = *p;
 469         buf[i++] = '\0';
 470
 471         if (proto == IPPROTO_ETHERTYPE) {
 472                 i = match_token(ether_types, buf);
 473                 free(buf);
 474                 if (i != -1) {  /* found */
 475                         *end = s1;
 476                         return i;
 477                 }
 478         } else {
 479                 struct protoent *pe = NULL;
 480                 struct servent *se;
 481
 482                 if (proto != 0)
 483                         pe = getprotobynumber(proto);
 484                 setservent(1);
 485                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 486                 free(buf);
 487                 if (se != NULL) {
 488                         *end = s1;
 489                         return ntohs(se->s_port);
 490                 }
 491         }
 492         return 0;       /* not found */
 493 }
 494
 495 /*
 496  * fill the body of the command with the list of port ranges.
 497  * At the moment it only understands numeric ranges.
 498  */
 499 static int
 500 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 501 {
 502         u_int16_t *p = cmd->ports;
 503         int i = 0;
 504         char *s = av;
 505
 506         while (*s) {
 507                 u_int16_t a, b;
 508
 509                 a = strtoport(av, &s, 0, proto);
 510                 if (s == av) /* no parameter */
 511                         break;
 512                 if (*s == '-') { /* a range */
 513                         av = s+1;
 514                         b = strtoport(av, &s, 0, proto);
 515                         if (s == av) /* no parameter */
 516                                 break;
 517                         p[0] = a;
 518                         p[1] = b;
 519                 } else if (*s == ',' || *s == '\0' ) {
 520                         p[0] = p[1] = a;
 521                 } else {        /* invalid separator */
 522                         errx(EX_DATAERR, "invalid separator <%c> in <%s>\n",
 523                                 *s, av);
 524                 }
 525                 i++;
 526                 p += 2;
 527                 av = s+1;
 528         }
 529         if (i > 0) {
 530                 if (i+1 > F_LEN_MASK)
 531                         errx(EX_DATAERR, "too many ports/ranges\n");
 532                 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
 533         }
 534         return i;
 535 }
 536
 537 static struct _s_x icmpcodes[] = {
 538       { "net",                  ICMP_UNREACH_NET },
 539       { "host",                 ICMP_UNREACH_HOST },
 540       { "protocol",             ICMP_UNREACH_PROTOCOL },
 541       { "port",                 ICMP_UNREACH_PORT },
 542       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 543       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 544       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 545       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 546       { "isolated",             ICMP_UNREACH_ISOLATED },
 547       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 548       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 549       { "tosnet",               ICMP_UNREACH_TOSNET },
 550       { "toshost",              ICMP_UNREACH_TOSHOST },
 551       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 552       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 553       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 554       { NULL, 0 }
 555 };
 556
 557 static void
 558 fill_reject_code(u_short *codep, char *str)
 559 {
 560         int val;
 561         char *s;
 562
 563         val = strtoul(str, &s, 0);
 564         if (s == str || *s != '\0' || val >= 0x100)
 565                 val = match_token(icmpcodes, str);
 566         if (val < 0)
 567                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 568         *codep = val;
 569         return;
 570 }
 571
 572 static void
 573 print_reject_code(u_int16_t code)
 574 {
 575         char *s = match_value(icmpcodes, code);
 576
 577         if (s != NULL)
 578                 printf("unreach %s", s);
 579         else
 580                 printf("unreach %u", code);
 581 }
 582
 583 /*
 584  * Returns the number of bits set (from left) in a contiguous bitmask,
 585  * or -1 if the mask is not contiguous.
 586  * XXX this needs a proper fix.
 587  * This effectively works on masks in big-endian (network) format.
 588  * when compiled on little endian architectures.
 589  *
 590  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 591  * the first bit on the wire is bit 0 of the first byte.
 592  * len is the max length in bits.
 593  */
 594 static int
 595 contigmask(u_char *p, int len)
 596 {
 597         int i, n;
 598         for (i=0; i<len ; i++)
 599                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 600                         break;
 601         for (n=i+1; n < len; n++)
 602                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 603                         return -1; /* mask not contiguous */
 604         return i;
 605 }
 606
 607 /*
 608  * print flags set/clear in the two bitmasks passed as parameters.
 609  * There is a specialized check for f_tcpflags.
 610  */
 611 static void
 612 print_flags(char *name, ipfw_insn *cmd, struct _s_x *list)
 613 {
 614         char *comma="";
 615         int i;
 616         u_char set = cmd->arg1 & 0xff;
 617         u_char clear = (cmd->arg1 >> 8) & 0xff;
 618
 619         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 620                 printf(" setup");
 621                 return;
 622         }
 623
 624         printf(" %s ", name);
 625         for (i=0; list[i].x != 0; i++) {
 626                 if (set & list[i].x) {
 627                         set &= ~list[i].x;
 628                         printf("%s%s", comma, list[i].s);
 629                         comma = ",";
 630                 }
 631                 if (clear & list[i].x) {
 632                         clear &= ~list[i].x;
 633                         printf("%s!%s", comma, list[i].s);
 634                         comma = ",";
 635                 }
 636         }
 637 }
 638
 639 /*
 640  * Print the ip address contained in a command.
 641  */
 642 static void
 643 print_ip(ipfw_insn_ip *cmd, char *s)
 644 {
 645         struct hostent *he = NULL;
 646         int mb;
 647
 648         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 649
 650         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 651                 printf("me");
 652                 return;
 653         }
 654         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 655                 u_int32_t x, *d;
 656                 int i;
 657                 char comma = '{';
 658
 659                 x = cmd->o.arg1 - 1;
 660                 x = htonl( ~x );
 661                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 662                 printf("%s/%d", inet_ntoa(cmd->addr),
 663                         contigmask((u_char *)&x, 32));
 664                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 665                 x &= 0xff; /* base */
 666                 d = (u_int32_t *)&(cmd->mask);
 667                 for (i=0; i < cmd->o.arg1; i++)
 668                         if (d[ i/32] & (1<<(i & 31))) {
 669                                 printf("%c%d", comma, i+x);
 670                                 comma = ',';
 671                         }
 672                 printf("}");
 673                 return;
 674         }
 675         if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
 676                 mb = 32;
 677         else
 678                 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
 679         if (mb == 32 && do_resolv)
 680                 he = gethostbyaddr((char *)&(cmd->addr.s_addr),
 681                     sizeof(u_long), AF_INET);
 682         if (he != NULL)         /* resolved to name */
 683                 printf("%s", he->h_name);
 684         else if (mb == 0)       /* any */
 685                 printf("any");
 686         else {          /* numeric IP followed by some kind of mask */
 687                 printf("%s", inet_ntoa(cmd->addr));
 688                 if (mb < 0)
 689                         printf(":%s", inet_ntoa(cmd->mask));
 690                 else if (mb < 32)
 691                         printf("/%d", mb);
 692         }
 693 }
 694
 695 /*
 696  * prints a MAC address/mask pair
 697  */
 698 static void
 699 print_mac(u_char *addr, u_char *mask)
 700 {
 701         int l = contigmask(mask, 48);
 702
 703         if (l == 0)
 704                 printf(" any");
 705         else {
 706                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 707                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 708                 if (l == -1)
 709                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 710                             mask[0], mask[1], mask[2],
 711                             mask[3], mask[4], mask[5]);
 712                 else if (l < 48)
 713                         printf("/%d", l);
 714         }
 715 }
 716
 717 static void
 718 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 719 {
 720         u_int8_t type;
 721
 722         cmd->d[0] = 0;
 723         while (*av) {
 724                 if (*av == ',')
 725                         av++;
 726
 727                 type = strtoul(av, &av, 0);
 728
 729                 if (*av != ',' && *av != '\0')
 730                         errx(EX_DATAERR, "invalid ICMP type");
 731
 732                 if (type > 31)
 733                         errx(EX_DATAERR, "ICMP type out of range");
 734
 735                 cmd->d[0] |= 1 << type;
 736         }
 737         cmd->o.opcode = O_ICMPTYPE;
 738         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 739 }
 740
 741 static void
 742 print_icmptypes(ipfw_insn_u32 *cmd)
 743 {
 744         int i;
 745         char sep= ' ';
 746
 747         printf(" icmptypes");
 748         for (i = 0; i < 32; i++) {
 749                 if ( (cmd->d[0] & (1 << (i))) == 0)
 750                         continue;
 751                 printf("%c%d", sep, i);
 752                 sep = ',';
 753         }
 754 }
 755
 756 /*
 757  * show_ipfw() prints the body of an ipfw rule.
 758  * Because the standard rule has at least proto src_ip dst_ip, we use
 759  * a helper function to produce these entries if not provided explicitly.
 760  * The first argument is the list of fields we have, the second is
 761  * the list of fields we want to be printed.
 762  *
 763  * Special cases if we have provided a MAC header:
 764  *   + if the rule does not contain IP addresses/ports, do not print them;
 765  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 766  *
 767  * Once we have 'have_options', IP header fields are printed as options.
 768  */
 769 #define HAVE_PROTO      0x0001
 770 #define HAVE_SRCIP      0x0002
 771 #define HAVE_DSTIP      0x0004
 772 #define HAVE_MAC        0x0008
 773 #define HAVE_MACTYPE    0x0010
 774 #define HAVE_OPTIONS    0x8000
 775
 776 #define HAVE_IP         (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
 777 static void
 778 show_prerequisites(int *flags, int want, int cmd)
 779 {
 780         if ( (*flags & HAVE_IP) == HAVE_IP)
 781                 *flags |= HAVE_OPTIONS;
 782
 783         if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC &&
 784              cmd != O_MAC_TYPE) {
 785                 /*
 786                  * mac-type was optimized out by the compiler,
 787                  * restore it
 788                  */
 789                 printf(" any");
 790                 *flags |= HAVE_MACTYPE | HAVE_OPTIONS;
 791                 return;
 792         }
 793         if ( !(*flags & HAVE_OPTIONS)) {
 794                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
 795                         printf(" ip");
 796                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 797                         printf(" from any");
 798                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 799                         printf(" to any");
 800         }
 801         *flags |= want;
 802 }
 803
 804 static void
 805 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 806 {
 807         static int twidth = 0;
 808         int l;
 809         ipfw_insn *cmd;
 810         int proto = 0;          /* default */
 811         int flags = 0;  /* prerequisites */
 812         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 813         int or_block = 0;       /* we are in an or block */
 814
 815         u_int32_t set_disable = (u_int32_t)(rule->next_rule);
 816
 817         if (set_disable & (1 << rule->set)) { /* disabled */
 818                 if (!show_sets)
 819                         return;
 820                 else
 821                         printf("# DISABLED ");
 822         }
 823         printf("%05u ", rule->rulenum);
 824
 825         if (do_acct)
 826                 printf("%*llu %*llu ", pcwidth, rule->pcnt, bcwidth,
 827                     rule->bcnt);
 828
 829         if (do_time) {
 830                 char timestr[30];
 831
 832                 if (twidth == 0) {
 833                         strcpy(timestr, ctime((time_t *)&twidth));
 834                         *strchr(timestr, '\n') = '\0';
 835                         twidth = strlen(timestr);
 836                 }
 837                 if (rule->timestamp) {
 838 #if _FreeBSD_version < 500000 /* XXX check */
 839 #define _long_to_time(x)        (time_t)(x)
 840 #endif
 841                         time_t t = _long_to_time(rule->timestamp);
 842
 843                         strcpy(timestr, ctime(&t));
 844                         *strchr(timestr, '\n') = '\0';
 845                         printf("%s ", timestr);
 846                 } else {
 847                         printf("%*s ", twidth, " ");
 848                 }
 849         }
 850
 851         if (show_sets)
 852                 printf("set %d ", rule->set);
 853
 854         /*
 855          * print the optional "match probability"
 856          */
 857         if (rule->cmd_len > 0) {
 858                 cmd = rule->cmd ;
 859                 if (cmd->opcode == O_PROB) {
 860                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 861                         double d = 1.0 * p->d[0];
 862
 863                         d = (d / 0x7fffffff);
 864                         printf("prob %f ", d);
 865                 }
 866         }
 867
 868         /*
 869          * first print actions
 870          */
 871         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 872                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 873                 switch(cmd->opcode) {
 874                 case O_CHECK_STATE:
 875                         printf("check-state");
 876                         flags = HAVE_IP; /* avoid printing anything else */
 877                         break;
 878
 879                 case O_ACCEPT:
 880                         printf("allow");
 881                         break;
 882
 883                 case O_COUNT:
 884                         printf("count");
 885                         break;
 886
 887                 case O_DENY:
 888                         printf("deny");
 889                         break;
 890
 891                 case O_REJECT:
 892                         if (cmd->arg1 == ICMP_REJECT_RST)
 893                                 printf("reset");
 894                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
 895                                 printf("reject");
 896                         else
 897                                 print_reject_code(cmd->arg1);
 898                         break;
 899
 900                 case O_SKIPTO:
 901                         printf("skipto %u", cmd->arg1);
 902                         break;
 903
 904                 case O_PIPE:
 905                         printf("pipe %u", cmd->arg1);
 906                         break;
 907
 908                 case O_QUEUE:
 909                         printf("queue %u", cmd->arg1);
 910                         break;
 911
 912                 case O_DIVERT:
 913                         printf("divert %u", cmd->arg1);
 914                         break;
 915
 916                 case O_TEE:
 917                         printf("tee %u", cmd->arg1);
 918                         break;
 919
 920                 case O_FORWARD_IP:
 921                     {
 922                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
 923
 924                         printf("fwd %s", inet_ntoa(s->sa.sin_addr));
 925                         if (s->sa.sin_port)
 926                                 printf(",%d", s->sa.sin_port);
 927                     }
 928                         break;
 929
 930                 case O_LOG: /* O_LOG is printed last */
 931                         logptr = (ipfw_insn_log *)cmd;
 932                         break;
 933
 934                 default:
 935                         printf("** unrecognized action %d len %d",
 936                                 cmd->opcode, cmd->len);
 937                 }
 938         }
 939         if (logptr) {
 940                 if (logptr->max_log > 0)
 941                         printf(" log logamount %d", logptr->max_log);
 942                 else
 943                         printf(" log");
 944         }
 945
 946         /*
 947          * then print the body.
 948          */
 949         if (rule->_pad & 1) {   /* empty rules before options */
 950                 if (!do_compact)
 951                         printf(" ip from any to any");
 952                 flags |= HAVE_IP | HAVE_OPTIONS;
 953         }
 954
 955         for (l = rule->act_ofs, cmd = rule->cmd ;
 956                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
 957                 /* useful alias */
 958                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
 959
 960                 show_prerequisites(&flags, 0, cmd->opcode);
 961
 962                 switch(cmd->opcode) {
 963                 case O_PROB:
 964                         break;  /* done already */
 965
 966                 case O_PROBE_STATE:
 967                         break; /* no need to print anything here */
 968
 969                 case O_MACADDR2: {
 970                         ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
 971
 972                         if ((cmd->len & F_OR) && !or_block)
 973                                 printf(" {");
 974                         if (cmd->len & F_NOT)
 975                                 printf(" not");
 976                         printf(" MAC");
 977                         flags |= HAVE_MAC;
 978                         print_mac( m->addr, m->mask);
 979                         print_mac( m->addr + 6, m->mask + 6);
 980                         }
 981                         break;
 982
 983                 case O_MAC_TYPE:
 984                         if ((cmd->len & F_OR) && !or_block)
 985                                 printf(" {");
 986                         print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE,
 987                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
 988                         flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS;
 989                         break;
 990
 991                 case O_IP_SRC:
 992                 case O_IP_SRC_MASK:
 993                 case O_IP_SRC_ME:
 994                 case O_IP_SRC_SET:
 995                         show_prerequisites(&flags, HAVE_PROTO, 0);
 996                         if (!(flags & HAVE_SRCIP))
 997                                 printf(" from");
 998                         if ((cmd->len & F_OR) && !or_block)
 999                                 printf(" {");
1000                         print_ip((ipfw_insn_ip *)cmd,
1001                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1002                         flags |= HAVE_SRCIP;
1003                         break;
1004
1005                 case O_IP_DST:
1006                 case O_IP_DST_MASK:
1007                 case O_IP_DST_ME:
1008                 case O_IP_DST_SET:
1009                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1010                         if (!(flags & HAVE_DSTIP))
1011                                 printf(" to");
1012                         if ((cmd->len & F_OR) && !or_block)
1013                                 printf(" {");
1014                         print_ip((ipfw_insn_ip *)cmd,
1015                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1016                         flags |= HAVE_DSTIP;
1017                         break;
1018
1019                 case O_IP_DSTPORT:
1020                         show_prerequisites(&flags, HAVE_IP, 0);
1021                 case O_IP_SRCPORT:
1022                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1023                         if ((cmd->len & F_OR) && !or_block)
1024                                 printf(" {");
1025                         print_newports((ipfw_insn_u16 *)cmd, proto,
1026                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1027                         break;
1028
1029                 case O_PROTO: {
1030                         struct protoent *pe;
1031
1032                         if ((cmd->len & F_OR) && !or_block)
1033                                 printf(" {");
1034                         if (cmd->len & F_NOT)
1035                                 printf(" not");
1036                         proto = cmd->arg1;
1037                         pe = getprotobynumber(cmd->arg1);
1038                         if (flags & HAVE_OPTIONS)
1039                                 printf(" proto");
1040                         if (pe)
1041                                 printf(" %s", pe->p_name);
1042                         else
1043                                 printf(" %u", cmd->arg1);
1044                         }
1045                         flags |= HAVE_PROTO;
1046                         break;
1047
1048                 default: /*options ... */
1049                         show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1050                         if ((cmd->len & F_OR) && !or_block)
1051                                 printf(" {");
1052                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1053                                 printf(" not");
1054                         switch(cmd->opcode) {
1055                         case O_FRAG:
1056                                 printf(" frag");
1057                                 break;
1058
1059                         case O_IN:
1060                                 printf(cmd->len & F_NOT ? " out" : " in");
1061                                 break;
1062
1063                         case O_LAYER2:
1064                                 printf(" layer2");
1065                                 break;
1066                         case O_XMIT:
1067                         case O_RECV:
1068                         case O_VIA: {
1069                                 char *s;
1070                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1071
1072                                 if (cmd->opcode == O_XMIT)
1073                                         s = "xmit";
1074                                 else if (cmd->opcode == O_RECV)
1075                                         s = "recv";
1076                                 else if (cmd->opcode == O_VIA)
1077                                         s = "via";
1078                                 if (cmdif->name[0] == '\0')
1079                                         printf(" %s %s", s,
1080                                             inet_ntoa(cmdif->p.ip));
1081                                 else if (cmdif->p.unit == -1)
1082                                         printf(" %s %s*", s, cmdif->name);
1083                                 else
1084                                         printf(" %s %s%d", s, cmdif->name,
1085                                             cmdif->p.unit);
1086                                 }
1087                                 break;
1088
1089                         case O_IPID:
1090                                 printf(" ipid %u", cmd->arg1 );
1091                                 break;
1092
1093                         case O_IPTTL:
1094                                 printf(" ipttl %u", cmd->arg1 );
1095                                 break;
1096
1097                         case O_IPVER:
1098                                 printf(" ipver %u", cmd->arg1 );
1099                                 break;
1100
1101                         case O_IPPRECEDENCE:
1102                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1103                                 break;
1104
1105                         case O_IPLEN:
1106                                 printf(" iplen %u", cmd->arg1 );
1107                                 break;
1108
1109                         case O_IPOPT:
1110                                 print_flags("ipoptions", cmd, f_ipopts);
1111                                 break;
1112
1113                         case O_IPTOS:
1114                                 print_flags("iptos", cmd, f_iptos);
1115                                 break;
1116
1117                         case O_ICMPTYPE:
1118                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1119                                 break;
1120
1121                         case O_ESTAB:
1122                                 printf(" established");
1123                                 break;
1124
1125                         case O_TCPFLAGS:
1126                                 print_flags("tcpflags", cmd, f_tcpflags);
1127                                 break;
1128
1129                         case O_TCPOPTS:
1130                                 print_flags("tcpoptions", cmd, f_tcpopts);
1131                                 break;
1132
1133                         case O_TCPWIN:
1134                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1135                                 break;
1136
1137                         case O_TCPACK:
1138                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1139                                 break;
1140
1141                         case O_TCPSEQ:
1142                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1143                                 break;
1144
1145                         case O_UID:
1146                             {
1147                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1148
1149                                 if (pwd)
1150                                         printf(" uid %s", pwd->pw_name);
1151                                 else
1152                                         printf(" uid %u", cmd32->d[0]);
1153                             }
1154                                 break;
1155
1156                         case O_GID:
1157                             {
1158                                 struct group *grp = getgrgid(cmd32->d[0]);
1159
1160                                 if (grp)
1161                                         printf(" gid %s", grp->gr_name);
1162                                 else
1163                                         printf(" gid %u", cmd32->d[0]);
1164                             }
1165                                 break;
1166
1167                         case O_KEEP_STATE:
1168                                 printf(" keep-state");
1169                                 break;
1170
1171                         case O_LIMIT:
1172                             {
1173                                 struct _s_x *p = limit_masks;
1174                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1175                                 u_int8_t x = c->limit_mask;
1176                                 char *comma = " ";
1177
1178                                 printf(" limit");
1179                                 for ( ; p->x != 0 ; p++)
1180                                         if ((x & p->x) == p->x) {
1181                                                 x &= ~p->x;
1182                                                 printf("%s%s", comma, p->s);
1183                                                 comma = ",";
1184                                         }
1185                                 printf(" %d", c->conn_limit);
1186                             }
1187                                 break;
1188
1189                         default:
1190                                 printf(" [opcode %d len %d]",
1191                                     cmd->opcode, cmd->len);
1192                         }
1193                 }
1194                 if (cmd->len & F_OR) {
1195                         printf(" or");
1196                         or_block = 1;
1197                 } else if (or_block) {
1198                         printf(" }");
1199                         or_block = 0;
1200                 }
1201         }
1202         show_prerequisites(&flags, HAVE_IP, 0);
1203
1204         printf("\n");
1205 }
1206
1207 static void
1208 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1209 {
1210         struct protoent *pe;
1211         struct in_addr a;
1212
1213         if (!do_expired) {
1214                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1215                         return;
1216         }
1217
1218         printf("%05d %*llu %*llu (%ds)", (int)(d->rule), pcwidth, d->pcnt,
1219             bcwidth, d->bcnt, d->expire);
1220         switch (d->dyn_type) {
1221         case O_LIMIT_PARENT:
1222                 printf(" PARENT %d", d->count);
1223                 break;
1224         case O_LIMIT:
1225                 printf(" LIMIT");
1226                 break;
1227         case O_KEEP_STATE: /* bidir, no mask */
1228                 printf(" STATE");
1229                 break;
1230         }
1231
1232         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1233                 printf(" %s", pe->p_name);
1234         else
1235                 printf(" proto %u", d->id.proto);
1236
1237         a.s_addr = htonl(d->id.src_ip);
1238         printf(" %s %d", inet_ntoa(a), d->id.src_port);
1239
1240         a.s_addr = htonl(d->id.dst_ip);
1241         printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1242         printf("\n");
1243 }
1244
1245 int
1246 sort_q(const void *pa, const void *pb)
1247 {
1248         int rev = (do_sort < 0);
1249         int field = rev ? -do_sort : do_sort;
1250         long long res = 0;
1251         const struct dn_flow_queue *a = pa;
1252         const struct dn_flow_queue *b = pb;
1253
1254         switch (field) {
1255         case 1: /* pkts */
1256                 res = a->len - b->len;
1257                 break;
1258         case 2: /* bytes */
1259                 res = a->len_bytes - b->len_bytes;
1260                 break;
1261
1262         case 3: /* tot pkts */
1263                 res = a->tot_pkts - b->tot_pkts;
1264                 break;
1265
1266         case 4: /* tot bytes */
1267                 res = a->tot_bytes - b->tot_bytes;
1268                 break;
1269         }
1270         if (res < 0)
1271                 res = -1;
1272         if (res > 0)
1273                 res = 1;
1274         return (int)(rev ? res : -res);
1275 }
1276
1277 static void
1278 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
1279 {
1280         int l;
1281
1282         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1283             fs->flow_mask.proto,
1284             fs->flow_mask.src_ip, fs->flow_mask.src_port,
1285             fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
1286         if (fs->rq_elements == 0)
1287                 return;
1288
1289         printf("BKT Prot ___Source IP/port____ "
1290             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1291         if (do_sort != 0)
1292                 heapsort(q, fs->rq_elements, sizeof *q, sort_q);
1293         for (l = 0; l < fs->rq_elements; l++) {
1294                 struct in_addr ina;
1295                 struct protoent *pe;
1296
1297                 ina.s_addr = htonl(q[l].id.src_ip);
1298                 printf("%3d ", q[l].hash_slot);
1299                 pe = getprotobynumber(q[l].id.proto);
1300                 if (pe)
1301                         printf("%-4s ", pe->p_name);
1302                 else
1303                         printf("%4u ", q[l].id.proto);
1304                 printf("%15s/%-5d ",
1305                     inet_ntoa(ina), q[l].id.src_port);
1306                 ina.s_addr = htonl(q[l].id.dst_ip);
1307                 printf("%15s/%-5d ",
1308                     inet_ntoa(ina), q[l].id.dst_port);
1309                 printf("%4qu %8qu %2u %4u %3u\n",
1310                     q[l].tot_pkts, q[l].tot_bytes,
1311                     q[l].len, q[l].len_bytes, q[l].drops);
1312                 if (verbose)
1313                         printf("   S %20qd  F %20qd\n",
1314                             q[l].S, q[l].F);
1315         }
1316 }
1317
1318 static void
1319 print_flowset_parms(struct dn_flow_set *fs, char *prefix)
1320 {
1321         int l;
1322         char qs[30];
1323         char plr[30];
1324         char red[90];   /* Display RED parameters */
1325
1326         l = fs->qsize;
1327         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1328                 if (l >= 8192)
1329                         sprintf(qs, "%d KB", l / 1024);
1330                 else
1331                         sprintf(qs, "%d B", l);
1332         } else
1333                 sprintf(qs, "%3d sl.", l);
1334         if (fs->plr)
1335                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1336         else
1337                 plr[0] = '\0';
1338         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1339                 sprintf(red,
1340                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1341                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1342                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1343                     SCALE_VAL(fs->min_th),
1344                     SCALE_VAL(fs->max_th),
1345                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1346         else
1347                 sprintf(red, "droptail");
1348
1349         printf("%s %s%s %d queues (%d buckets) %s\n",
1350             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1351 }
1352
1353 static void
1354 list_pipes(void *data, int nbytes, int ac, char *av[])
1355 {
1356         u_long rulenum;
1357         void *next = data;
1358         struct dn_pipe *p = (struct dn_pipe *) data;
1359         struct dn_flow_set *fs;
1360         struct dn_flow_queue *q;
1361         int l;
1362
1363         if (ac > 0)
1364                 rulenum = strtoul(*av++, NULL, 10);
1365         else
1366                 rulenum = 0;
1367         for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
1368                 double b = p->bandwidth;
1369                 char buf[30];
1370                 char prefix[80];
1371
1372                 if (p->next != (struct dn_pipe *)DN_IS_PIPE)
1373                         break;  /* done with pipes, now queues */
1374
1375                 /*
1376                  * compute length, as pipe have variable size
1377                  */
1378                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1379                 next = (void *)p + l;
1380                 nbytes -= l;
1381
1382                 if (rulenum != 0 && rulenum != p->pipe_nr)
1383                         continue;
1384
1385                 /*
1386                  * Print rate (or clocking interface)
1387                  */
1388                 if (p->if_name[0] != '\0')
1389                         sprintf(buf, "%s", p->if_name);
1390                 else if (b == 0)
1391                         sprintf(buf, "unlimited");
1392                 else if (b >= 1000000)
1393                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1394                 else if (b >= 1000)
1395                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1396                 else
1397                         sprintf(buf, "%7.3f bit/s ", b);
1398
1399                 sprintf(prefix, "%05d: %s %4d ms ",
1400                     p->pipe_nr, buf, p->delay);
1401                 print_flowset_parms(&(p->fs), prefix);
1402                 if (verbose)
1403                         printf("   V %20qd\n", p->V >> MY_M);
1404
1405                 q = (struct dn_flow_queue *)(p+1);
1406                 list_queues(&(p->fs), q);
1407         }
1408         for (fs = next; nbytes >= sizeof *fs; fs = next) {
1409                 char prefix[80];
1410
1411                 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
1412                         break;
1413                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1414                 next = (void *)fs + l;
1415                 nbytes -= l;
1416                 q = (struct dn_flow_queue *)(fs+1);
1417                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1418                     fs->fs_nr, fs->weight, fs->parent_nr);
1419                 print_flowset_parms(fs, prefix);
1420                 list_queues(fs, q);
1421         }
1422 }
1423
1424 /*
1425  * This one handles all set-related commands
1426  *      ipfw set { show | enable | disable }
1427  *      ipfw set swap X Y
1428  *      ipfw set move X to Y
1429  *      ipfw set move rule X to Y
1430  */
1431 static void
1432 sets_handler(int ac, char *av[])
1433 {
1434         u_int32_t set_disable, masks[2];
1435         int i, nbytes;
1436         u_int16_t rulenum;
1437         u_int8_t cmd, new_set;
1438
1439         ac--;
1440         av++;
1441
1442         if (!ac)
1443                 errx(EX_USAGE, "set needs command");
1444         if (!strncmp(*av, "show", strlen(*av)) ) {
1445                 void *data;
1446                 char *msg;
1447
1448                 nbytes = sizeof(struct ip_fw);
1449                 if ((data = malloc(nbytes)) == NULL)
1450                         err(EX_OSERR, "malloc");
1451                 if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
1452                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1453                 set_disable = (u_int32_t)(((struct ip_fw *)data)->next_rule);
1454
1455                 for (i = 0, msg = "disable" ; i < 31; i++)
1456                         if (  (set_disable & (1<<i))) {
1457                                 printf("%s %d", msg, i);
1458                                 msg = "";
1459                         }
1460                 msg = (set_disable) ? " enable" : "enable";
1461                 for (i = 0; i < 31; i++)
1462                         if ( !(set_disable & (1<<i))) {
1463                                 printf("%s %d", msg, i);
1464                                 msg = "";
1465                         }
1466                 printf("\n");
1467         } else if (!strncmp(*av, "swap", strlen(*av))) {
1468                 ac--; av++;
1469                 if (ac != 2)
1470                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1471                 rulenum = atoi(av[0]);
1472                 new_set = atoi(av[1]);
1473                 if (!isdigit(*(av[0])) || rulenum > 30)
1474                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1475                 if (!isdigit(*(av[1])) || new_set > 30)
1476                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1477                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1478                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1479                         masks, sizeof(u_int32_t));
1480         } else if (!strncmp(*av, "move", strlen(*av))) {
1481                 ac--; av++;
1482                 if (ac && !strncmp(*av, "rule", strlen(*av))) {
1483                         cmd = 2;
1484                         ac--; av++;
1485                 } else
1486                         cmd = 3;
1487                 if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
1488                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1489                 rulenum = atoi(av[0]);
1490                 new_set = atoi(av[2]);
1491                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
1492                         (cmd == 2 && rulenum == 65535) )
1493                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1494                 if (!isdigit(*(av[2])) || new_set > 30)
1495                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1496                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1497                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1498                         masks, sizeof(u_int32_t));
1499         } else if (!strncmp(*av, "disable", strlen(*av)) ||
1500                    !strncmp(*av, "enable",  strlen(*av)) ) {
1501                 int which = !strncmp(*av, "enable",  strlen(*av)) ? 1 : 0;
1502
1503                 ac--; av++;
1504                 masks[0] = masks[1] = 0;
1505
1506                 while (ac) {
1507                         if (isdigit(**av)) {
1508                                 i = atoi(*av);
1509                                 if (i < 0 || i > 30)
1510                                         errx(EX_DATAERR,
1511                                             "invalid set number %d\n", i);
1512                                 masks[which] |= (1<<i);
1513                         } else if (!strncmp(*av, "disable", strlen(*av)))
1514                                 which = 0;
1515                         else if (!strncmp(*av, "enable", strlen(*av)))
1516                                 which = 1;
1517                         else
1518                                 errx(EX_DATAERR,
1519                                         "invalid set command %s\n", *av);
1520                         av++; ac--;
1521                 }
1522                 if ( (masks[0] & masks[1]) != 0 )
1523                         errx(EX_DATAERR,
1524                             "cannot enable and disable the same set\n");
1525
1526                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
1527                 if (i)
1528                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1529         } else
1530                 errx(EX_USAGE, "invalid set command %s\n", *av);
1531 }
1532
1533 static void
1534 sysctl_handler(int ac, char *av[], int which)
1535 {
1536         ac--;
1537         av++;
1538
1539         if (*av == NULL) {
1540                 warnx("missing keyword to enable/disable\n");
1541         } else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
1542                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1543                     &which, sizeof(which));
1544         } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
1545                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1546                     &which, sizeof(which));
1547         } else if (strncmp(*av, "debug", strlen(*av)) == 0) {
1548                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1549                     &which, sizeof(which));
1550         } else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
1551                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1552                     &which, sizeof(which));
1553         } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
1554                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1555                     &which, sizeof(which));
1556         } else {
1557                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1558         }
1559 }
1560
1561 static void
1562 list(int ac, char *av[])
1563 {
1564         struct ip_fw *r;
1565         ipfw_dyn_rule *dynrules, *d;
1566
1567         void *lim, *data = NULL;
1568         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1569         int exitval = EX_OK;
1570         int lac;
1571         char **lav;
1572         u_long rnum;
1573         char *endptr;
1574         int seen = 0;
1575
1576         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1577         int nalloc = 1024;      /* start somewhere... */
1578
1579         ac--;
1580         av++;
1581
1582         /* get rules or pipes from kernel, resizing array as necessary */
1583         nbytes = nalloc;
1584
1585         while (nbytes >= nalloc) {
1586                 nalloc = nalloc * 2 + 200;
1587                 nbytes = nalloc;
1588                 if ((data = realloc(data, nbytes)) == NULL)
1589                         err(EX_OSERR, "realloc");
1590                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1591                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1592                                 do_pipe ? "DUMMYNET" : "FW");
1593         }
1594
1595         if (do_pipe) {
1596                 list_pipes(data, nbytes, ac, av);
1597                 goto done;
1598         }
1599
1600         /*
1601          * Count static rules. They have variable size so we
1602          * need to scan the list to count them.
1603          */
1604         for (nstat = 1, r = data, lim = data + nbytes;
1605                     r->rulenum < 65535 && (void *)r < lim;
1606                     ++nstat, r = (void *)r + RULESIZE(r) )
1607                 ; /* nothing */
1608
1609         /*
1610          * Count dynamic rules. This is easier as they have
1611          * fixed size.
1612          */
1613         r = (void *)r + RULESIZE(r);
1614         dynrules = (ipfw_dyn_rule *)r ;
1615         n = (void *)r - data;
1616         ndyn = (nbytes - n) / sizeof *dynrules;
1617
1618         /* if showing stats, figure out column widths ahead of time */
1619         bcwidth = pcwidth = 0;
1620         if (do_acct) {
1621                 for (n = 0, r = data; n < nstat;
1622                     n++, r = (void *)r + RULESIZE(r)) {
1623                         /* packet counter */
1624                         width = snprintf(NULL, 0, "%llu", r->pcnt);
1625                         if (width > pcwidth)
1626                                 pcwidth = width;
1627
1628                         /* byte counter */
1629                         width = snprintf(NULL, 0, "%llu", r->bcnt);
1630                         if (width > bcwidth)
1631                                 bcwidth = width;
1632                 }
1633         }
1634         if (do_dynamic && ndyn) {
1635                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1636                         width = snprintf(NULL, 0, "%llu", d->pcnt);
1637                         if (width > pcwidth)
1638                                 pcwidth = width;
1639
1640                         width = snprintf(NULL, 0, "%llu", d->bcnt);
1641                         if (width > bcwidth)
1642                                 bcwidth = width;
1643                 }
1644         }
1645         /* if no rule numbers were specified, list all rules */
1646         if (ac == 0) {
1647                 for (n = 0, r = data; n < nstat;
1648                     n++, r = (void *)r + RULESIZE(r) )
1649                         show_ipfw(r, pcwidth, bcwidth);
1650
1651                 if (do_dynamic && ndyn) {
1652                         printf("## Dynamic rules (%d):\n", ndyn);
1653                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1654                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1655                 }
1656                 goto done;
1657         }
1658
1659         /* display specific rules requested on command line */
1660
1661         for (lac = ac, lav = av; lac != 0; lac--) {
1662                 /* convert command line rule # */
1663                 rnum = strtoul(*lav++, &endptr, 10);
1664                 if (*endptr) {
1665                         exitval = EX_USAGE;
1666                         warnx("invalid rule number: %s", *(lav - 1));
1667                         continue;
1668                 }
1669                 for (n = seen = 0, r = data; n < nstat;
1670                     n++, r = (void *)r + RULESIZE(r) ) {
1671                         if (r->rulenum > rnum)
1672                                 break;
1673                         if (r->rulenum == rnum) {
1674                                 show_ipfw(r, pcwidth, bcwidth);
1675                                 seen = 1;
1676                         }
1677                 }
1678                 if (!seen) {
1679                         /* give precedence to other error(s) */
1680                         if (exitval == EX_OK)
1681                                 exitval = EX_UNAVAILABLE;
1682                         warnx("rule %lu does not exist", rnum);
1683                 }
1684         }
1685
1686         if (do_dynamic && ndyn) {
1687                 printf("## Dynamic rules:\n");
1688                 for (lac = ac, lav = av; lac != 0; lac--) {
1689                         rnum = strtoul(*lav++, &endptr, 10);
1690                         if (*endptr)
1691                                 /* already warned */
1692                                 continue;
1693                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1694                                 if ((int)(d->rule) > rnum)
1695                                         break;
1696                                 if ((int)(d->rule) == rnum)
1697                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1698                         }
1699                 }
1700         }
1701
1702         ac = 0;
1703
1704 done:
1705         free(data);
1706
1707         if (exitval != EX_OK)
1708                 exit(exitval);
1709 }
1710
1711 static void
1712 show_usage(void)
1713 {
1714         fprintf(stderr, "usage: ipfw [options]\n"
1715 "    add [number] rule\n"
1716 "    pipe number config [pipeconfig]\n"
1717 "    queue number config [queueconfig]\n"
1718 "    [pipe] flush\n"
1719 "    [pipe] delete number ...\n"
1720 "    [pipe] {list|show} [number ...]\n"
1721 "    {zero|resetlog} [number ...]\n"
1722 "do \"ipfw -h\" or see ipfw manpage for details\n"
1723 );
1724
1725         exit(EX_USAGE);
1726 }
1727
1728 static void
1729 help(void)
1730 {
1731
1732         fprintf(stderr, "ipfw syntax summary:\n"
1733 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1734 "ipfw {pipe|queue} N config BODY\n"
1735 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1736 "\n"
1737 "RULE:          [1..] [PROB] BODY\n"
1738 "RULENUM:       INTEGER(1..65534)\n"
1739 "PROB:          prob REAL(0..1)\n"
1740 "BODY:          check-state [LOG] (no body) |\n"
1741 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1742 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1743 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1744 "ADDR:          [ MAC dst src ether_type ] \n"
1745 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1746 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1747 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1748 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1749 );
1750 exit(0);
1751 }
1752
1753
1754 static int
1755 lookup_host (char *host, struct in_addr *ipaddr)
1756 {
1757         struct hostent *he;
1758
1759         if (!inet_aton(host, ipaddr)) {
1760                 if ((he = gethostbyname(host)) == NULL)
1761                         return(-1);
1762                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1763         }
1764         return(0);
1765 }
1766
1767 /*
1768  * fills the addr and mask fields in the instruction as appropriate from av.
1769  * Update length as appropriate.
1770  * The following formats are allowed:
1771  *      any     matches any IP. Actually returns an empty instruction.
1772  *      me      returns O_IP_*_ME
1773  *      1.2.3.4         single IP address
1774  *      1.2.3.4:5.6.7.8 address:mask
1775  *      1.2.3.4/24      address/mask
1776  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1777  */
1778 static void
1779 fill_ip(ipfw_insn_ip *cmd, char *av)
1780 {
1781         char *p = 0, md = 0;
1782         u_int32_t i;
1783
1784         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1785
1786         if (!strncmp(av, "any", strlen(av)))
1787                 return;
1788
1789         if (!strncmp(av, "me", strlen(av))) {
1790                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1791                 return;
1792         }
1793
1794         p = strchr(av, '/');
1795         if (!p)
1796                 p = strchr(av, ':');
1797         if (p) {
1798                 md = *p;
1799                 *p++ = '\0';
1800         }
1801
1802         if (lookup_host(av, &cmd->addr) != 0)
1803                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1804         switch (md) {
1805         case ':':
1806                 if (!inet_aton(p, &cmd->mask))
1807                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1808                 break;
1809         case '/':
1810                 i = atoi(p);
1811                 if (i == 0)
1812                         cmd->mask.s_addr = htonl(0);
1813                 else if (i > 32)
1814                         errx(EX_DATAERR, "bad width ``%s''", p);
1815                 else
1816                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1817                 break;
1818         default:
1819                 cmd->mask.s_addr = htonl(~0);
1820                 break;
1821         }
1822         cmd->addr.s_addr &= cmd->mask.s_addr;
1823         /*
1824          * now look if we have a set of addresses. They are stored as follows:
1825          *   arg1       is the set size (powers of 2, 2..256)
1826          *   addr       is the base address IN HOST FORMAT
1827          *   mask..     is an array of u_int32_t with bits set.
1828          */
1829         if (p)
1830                 p = strchr(p, '{');
1831         if (p) {        /* fetch addresses */
1832                 u_int32_t *d;
1833                 int low, high;
1834                 int i = contigmask((u_char *)&(cmd->mask), 32);
1835
1836                 if (i < 24 || i > 31) {
1837                         fprintf(stderr, "invalid set with mask %d\n",
1838                                 i);
1839                         exit(0);
1840                 }
1841                 cmd->o.arg1 = 1<<(32-i);
1842                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1843                 d = (u_int32_t *)&cmd->mask;
1844                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1845                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1846                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
1847                         d[i] = 0;       /* clear masks */
1848
1849                 av = p+1;
1850                 low = cmd->addr.s_addr & 0xff;
1851                 high = low + cmd->o.arg1 - 1;
1852                 while (isdigit(*av)) {
1853                         char *s;
1854                         u_int16_t a = strtol(av, &s, 0);
1855
1856                         if (s == av) /* no parameter */
1857                                 break;
1858                         if (a < low || a > high) {
1859                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1860                                 a, low, high);
1861                             exit(0);
1862                         }
1863                         a -= low;
1864                         d[ a/32] |= 1<<(a & 31);
1865                         if (*s != ',')
1866                                 break;
1867                         av = s+1;
1868                 }
1869                 return;
1870         }
1871
1872         if (cmd->mask.s_addr == 0) { /* any */
1873                 if (cmd->o.len & F_NOT)
1874                         errx(EX_DATAERR, "not any never matches");
1875                 else    /* useless, nuke it */
1876                         return;
1877         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1878                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1879         else                                            /* addr/mask */
1880                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1881 }
1882
1883
1884 /*
1885  * helper function to process a set of flags and set bits in the
1886  * appropriate masks.
1887  */
1888 static void
1889 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1890         struct _s_x *flags, char *p)
1891 {
1892         u_int8_t set=0, clear=0;
1893
1894         while (p && *p) {
1895                 char *q;        /* points to the separator */
1896                 int val;
1897                 u_int8_t *which;        /* mask we are working on */
1898
1899                 if (*p == '!') {
1900                         p++;
1901                         which = &clear;
1902                 } else
1903                         which = &set;
1904                 q = strchr(p, ',');
1905                 if (q)
1906                         *q++ = '\0';
1907                 val = match_token(flags, p);
1908                 if (val <= 0)
1909                         errx(EX_DATAERR, "invalid flag %s", p);
1910                 *which |= (u_int8_t)val;
1911                 p = q;
1912         }
1913         cmd->opcode = opcode;
1914         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1915         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1916 }
1917
1918
1919 static void
1920 delete(int ac, char *av[])
1921 {
1922         u_int32_t rulenum;
1923         struct dn_pipe pipe;
1924         int i;
1925         int exitval = EX_OK;
1926         int do_set = 0;
1927
1928         memset(&pipe, 0, sizeof pipe);
1929
1930         av++; ac--;
1931         if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
1932                 do_set = 1;     /* delete set */
1933                 ac--; av++;
1934         }
1935
1936         /* Rule number */
1937         while (ac && isdigit(**av)) {
1938                 i = atoi(*av); av++; ac--;
1939                 if (do_pipe) {
1940                         if (do_pipe == 1)
1941                                 pipe.pipe_nr = i;
1942                         else
1943                                 pipe.fs.fs_nr = i;
1944                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1945                             &pipe, sizeof pipe);
1946                         if (i) {
1947                                 exitval = 1;
1948                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1949                                     do_pipe == 1 ? pipe.pipe_nr :
1950                                     pipe.fs.fs_nr);
1951                         }
1952                 } else {
1953                         rulenum =  (i & 0xffff) | (do_set << 24);
1954                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1955                             sizeof rulenum);
1956                         if (i) {
1957                                 exitval = EX_UNAVAILABLE;
1958                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1959                                     rulenum);
1960                         }
1961                 }
1962         }
1963         if (exitval != EX_OK)
1964                 exit(exitval);
1965 }
1966
1967
1968 /*
1969  * fill the interface structure. We do not check the name as we can
1970  * create interfaces dynamically, so checking them at insert time
1971  * makes relatively little sense.
1972  * A '*' following the name means any unit.
1973  */
1974 static void
1975 fill_iface(ipfw_insn_if *cmd, char *arg)
1976 {
1977         cmd->name[0] = '\0';
1978         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1979
1980         /* Parse the interface or address */
1981         if (!strcmp(arg, "any"))
1982                 cmd->o.len = 0;         /* effectively ignore this command */
1983         else if (!isdigit(*arg)) {
1984                 char *q;
1985
1986                 strncpy(cmd->name, arg, sizeof(cmd->name));
1987                 cmd->name[sizeof(cmd->name) - 1] = '\0';
1988                 /* find first digit or wildcard */
1989                 for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++)
1990                         continue;
1991                 cmd->p.unit = (*q == '*') ? -1 : atoi(q);
1992                 *q = '\0';
1993         } else if (!inet_aton(arg, &cmd->p.ip))
1994                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1995 }
1996
1997 /*
1998  * the following macro returns an error message if we run out of
1999  * arguments.
2000  */
2001 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
2002
2003 static void
2004 config_pipe(int ac, char **av)
2005 {
2006         struct dn_pipe pipe;
2007         int i;
2008         char *end;
2009         u_int32_t a;
2010         void *par = NULL;
2011
2012         memset(&pipe, 0, sizeof pipe);
2013
2014         av++; ac--;
2015         /* Pipe number */
2016         if (ac && isdigit(**av)) {
2017                 i = atoi(*av); av++; ac--;
2018                 if (do_pipe == 1)
2019                         pipe.pipe_nr = i;
2020                 else
2021                         pipe.fs.fs_nr = i;
2022         }
2023         while (ac > 0) {
2024                 double d;
2025                 int tok = match_token(dummynet_params, *av);
2026                 ac--; av++;
2027
2028                 switch(tok) {
2029                 case TOK_NOERROR:
2030                         pipe.fs.flags_fs |= DN_NOERROR;
2031                         break;
2032
2033                 case TOK_PLR:
2034                         NEED1("plr needs argument 0..1\n");
2035                         d = strtod(av[0], NULL);
2036                         if (d > 1)
2037                                 d = 1;
2038                         else if (d < 0)
2039                                 d = 0;
2040                         pipe.fs.plr = (int)(d*0x7fffffff);
2041                         ac--; av++;
2042                         break;
2043
2044                 case TOK_QUEUE:
2045                         NEED1("queue needs queue size\n");
2046                         end = NULL;
2047                         pipe.fs.qsize = strtoul(av[0], &end, 0);
2048                         if (*end == 'K' || *end == 'k') {
2049                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
2050                                 pipe.fs.qsize *= 1024;
2051                         } else if (*end == 'B' || !strncmp(end, "by", 2)) {
2052                                 pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
2053                         }
2054                         ac--; av++;
2055                         break;
2056
2057                 case TOK_BUCKETS:
2058                         NEED1("buckets needs argument\n");
2059                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
2060                         ac--; av++;
2061                         break;
2062
2063                 case TOK_MASK:
2064                         NEED1("mask needs mask specifier\n");
2065                         /*
2066                          * per-flow queue, mask is dst_ip, dst_port,
2067                          * src_ip, src_port, proto measured in bits
2068                          */
2069                         par = NULL;
2070
2071                         pipe.fs.flow_mask.dst_ip = 0;
2072                         pipe.fs.flow_mask.src_ip = 0;
2073                         pipe.fs.flow_mask.dst_port = 0;
2074                         pipe.fs.flow_mask.src_port = 0;
2075                         pipe.fs.flow_mask.proto = 0;
2076                         end = NULL;
2077
2078                         while (ac >= 1) {
2079                             u_int32_t *p32 = NULL;
2080                             u_int16_t *p16 = NULL;
2081
2082                             tok = match_token(dummynet_params, *av);
2083                             ac--; av++;
2084                             switch(tok) {
2085                             case TOK_ALL:
2086                                     /*
2087                                      * special case, all bits significant
2088                                      */
2089                                     pipe.fs.flow_mask.dst_ip = ~0;
2090                                     pipe.fs.flow_mask.src_ip = ~0;
2091                                     pipe.fs.flow_mask.dst_port = ~0;
2092                                     pipe.fs.flow_mask.src_port = ~0;
2093                                     pipe.fs.flow_mask.proto = ~0;
2094                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2095                                     goto end_mask;
2096
2097                             case TOK_DSTIP:
2098                                     p32 = &pipe.fs.flow_mask.dst_ip;
2099                                     break;
2100
2101                             case TOK_SRCIP:
2102                                     p32 = &pipe.fs.flow_mask.src_ip;
2103                                     break;
2104
2105                             case TOK_DSTPORT:
2106                                     p16 = &pipe.fs.flow_mask.dst_port;
2107                                     break;
2108
2109                             case TOK_SRCPORT:
2110                                     p16 = &pipe.fs.flow_mask.src_port;
2111                                     break;
2112
2113                             case TOK_PROTO:
2114                                     break;
2115
2116                             default:
2117                                     ac++; av--; /* backtrack */
2118                                     goto end_mask;
2119                             }
2120                             if (ac < 1)
2121                                     errx(EX_USAGE, "mask: value missing");
2122                             if (*av[0] == '/') {
2123                                     a = strtoul(av[0]+1, &end, 0);
2124                                     a = (a == 32) ? ~0 : (1 << a) - 1;
2125                             } else
2126                                     a = strtoul(av[0], &end, 0);
2127                             if (p32 != NULL)
2128                                     *p32 = a;
2129                             else if (p16 != NULL) {
2130                                     if (a > 65535)
2131                                             errx(EX_DATAERR,
2132                                                 "mask: must be 16 bit");
2133                                     *p16 = (u_int16_t)a;
2134                             } else {
2135                                     if (a > 255)
2136                                             errx(EX_DATAERR,
2137                                                 "mask: must be 8 bit");
2138                                     pipe.fs.flow_mask.proto = (u_int8_t)a;
2139                             }
2140                             if (a != 0)
2141                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2142                             ac--; av++;
2143                         } /* end while, config masks */
2144 end_mask:
2145                         break;
2146
2147                 case TOK_RED:
2148                 case TOK_GRED:
2149                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
2150                         pipe.fs.flags_fs |= DN_IS_RED;
2151                         if (tok == TOK_GRED)
2152                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
2153                         /*
2154                          * the format for parameters is w_q/min_th/max_th/max_p
2155                          */
2156                         if ((end = strsep(&av[0], "/"))) {
2157                             double w_q = strtod(end, NULL);
2158                             if (w_q > 1 || w_q <= 0)
2159                                 errx(EX_DATAERR, "0 < w_q <= 1");
2160                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
2161                         }
2162                         if ((end = strsep(&av[0], "/"))) {
2163                             pipe.fs.min_th = strtoul(end, &end, 0);
2164                             if (*end == 'K' || *end == 'k')
2165                                 pipe.fs.min_th *= 1024;
2166                         }
2167                         if ((end = strsep(&av[0], "/"))) {
2168                             pipe.fs.max_th = strtoul(end, &end, 0);
2169                             if (*end == 'K' || *end == 'k')
2170                                 pipe.fs.max_th *= 1024;
2171                         }
2172                         if ((end = strsep(&av[0], "/"))) {
2173                             double max_p = strtod(end, NULL);
2174                             if (max_p > 1 || max_p <= 0)
2175                                 errx(EX_DATAERR, "0 < max_p <= 1");
2176                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
2177                         }
2178                         ac--; av++;
2179                         break;
2180
2181                 case TOK_DROPTAIL:
2182                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
2183                         break;
2184
2185                 case TOK_BW:
2186                         NEED1("bw needs bandwidth or interface\n");
2187                         if (do_pipe != 1)
2188                             errx(EX_DATAERR, "bandwidth only valid for pipes");
2189                         /*
2190                          * set clocking interface or bandwidth value
2191                          */
2192                         if (av[0][0] >= 'a' && av[0][0] <= 'z') {
2193                             int l = sizeof(pipe.if_name)-1;
2194                             /* interface name */
2195                             strncpy(pipe.if_name, av[0], l);
2196                             pipe.if_name[l] = '\0';
2197                             pipe.bandwidth = 0;
2198                         } else {
2199                             pipe.if_name[0] = '\0';
2200                             pipe.bandwidth = strtoul(av[0], &end, 0);
2201                             if (*end == 'K' || *end == 'k') {
2202                                 end++;
2203                                 pipe.bandwidth *= 1000;
2204                             } else if (*end == 'M') {
2205                                 end++;
2206                                 pipe.bandwidth *= 1000000;
2207                             }
2208                             if (*end == 'B' || !strncmp(end, "by", 2))
2209                                 pipe.bandwidth *= 8;
2210                             if (pipe.bandwidth < 0)
2211                                 errx(EX_DATAERR, "bandwidth too large");
2212                         }
2213                         ac--; av++;
2214                         break;
2215
2216                 case TOK_DELAY:
2217                         if (do_pipe != 1)
2218                                 errx(EX_DATAERR, "delay only valid for pipes");
2219                         NEED1("delay needs argument 0..10000ms\n");
2220                         pipe.delay = strtoul(av[0], NULL, 0);
2221                         ac--; av++;
2222                         break;
2223
2224                 case TOK_WEIGHT:
2225                         if (do_pipe == 1)
2226                                 errx(EX_DATAERR,"weight only valid for queues");
2227                         NEED1("weight needs argument 0..100\n");
2228                         pipe.fs.weight = strtoul(av[0], &end, 0);
2229                         ac--; av++;
2230                         break;
2231
2232                 case TOK_PIPE:
2233                         if (do_pipe == 1)
2234                                 errx(EX_DATAERR,"pipe only valid for queues");
2235                         NEED1("pipe needs pipe_number\n");
2236                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
2237                         ac--; av++;
2238                         break;
2239
2240                 default:
2241                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
2242                 }
2243         }
2244         if (do_pipe == 1) {
2245                 if (pipe.pipe_nr == 0)
2246                         errx(EX_DATAERR, "pipe_nr must be > 0");
2247                 if (pipe.delay > 10000)
2248                         errx(EX_DATAERR, "delay must be < 10000");
2249         } else { /* do_pipe == 2, queue */
2250                 if (pipe.fs.parent_nr == 0)
2251                         errx(EX_DATAERR, "pipe must be > 0");
2252                 if (pipe.fs.weight >100)
2253                         errx(EX_DATAERR, "weight must be <= 100");
2254         }
2255         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
2256                 if (pipe.fs.qsize > 1024*1024)
2257                         errx(EX_DATAERR, "queue size must be < 1MB");
2258         } else {
2259                 if (pipe.fs.qsize > 100)
2260                         errx(EX_DATAERR, "2 <= queue size <= 100");
2261         }
2262         if (pipe.fs.flags_fs & DN_IS_RED) {
2263                 size_t len;
2264                 int lookup_depth, avg_pkt_size;
2265                 double s, idle, weight, w_q;
2266                 struct clockinfo clock;
2267                 int t;
2268
2269                 if (pipe.fs.min_th >= pipe.fs.max_th)
2270                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
2271                         pipe.fs.min_th, pipe.fs.max_th);
2272                 if (pipe.fs.max_th == 0)
2273                     errx(EX_DATAERR, "max_th must be > 0");
2274
2275                 len = sizeof(int);
2276                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
2277                         &lookup_depth, &len, NULL, 0) == -1)
2278
2279                     errx(1, "sysctlbyname(\"%s\")",
2280                         "net.inet.ip.dummynet.red_lookup_depth");
2281                 if (lookup_depth == 0)
2282                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2283                         " must be greater than zero");
2284
2285                 len = sizeof(int);
2286                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2287                         &avg_pkt_size, &len, NULL, 0) == -1)
2288
2289                     errx(1, "sysctlbyname(\"%s\")",
2290                         "net.inet.ip.dummynet.red_avg_pkt_size");
2291                 if (avg_pkt_size == 0)
2292                         errx(EX_DATAERR,
2293                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2294                             " be greater than zero");
2295
2296                 len = sizeof(struct clockinfo);
2297                 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
2298                         errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
2299
2300                 /*
2301                  * Ticks needed for sending a medium-sized packet.
2302                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2303                  * do not have bandwidth information, because that is stored
2304                  * in the parent pipe, and also we have multiple queues
2305                  * competing for it. So we set s=0, which is not very
2306                  * correct. But on the other hand, why do we want RED with
2307                  * WF2Q+ ?
2308                  */
2309                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2310                         s = 0;
2311                 else
2312                         s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
2313
2314                 /*
2315                  * max idle time (in ticks) before avg queue size becomes 0.
2316                  * NOTA:  (3/w_q) is approx the value x so that
2317                  * (1-w_q)^x < 10^-3.
2318                  */
2319                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2320                 idle = s * 3. / w_q;
2321                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2322                 if (!pipe.fs.lookup_step)
2323                         pipe.fs.lookup_step = 1;
2324                 weight = 1 - w_q;
2325                 for (t = pipe.fs.lookup_step; t > 0; --t)
2326                         weight *= weight;
2327                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2328         }
2329         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2330                             sizeof pipe);
2331         if (i)
2332                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2333 }
2334
2335 static void
2336 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2337 {
2338         int i, l;
2339
2340         for (i=0; i<6; i++)
2341                 addr[i] = mask[i] = 0;
2342         if (!strcmp(p, "any"))
2343                 return;
2344
2345         for (i=0; *p && i<6;i++, p++) {
2346                 addr[i] = strtol(p, &p, 16);
2347                 if (*p != ':') /* we start with the mask */
2348                         break;
2349         }
2350         if (*p == '/') { /* mask len */
2351                 l = strtol(p+1, &p, 0);
2352                 for (i=0; l>0; l -=8, i++)
2353                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2354         } else if (*p == '&') { /* mask */
2355                 for (i=0, p++; *p && i<6;i++, p++) {
2356                         mask[i] = strtol(p, &p, 16);
2357                         if (*p != ':')
2358                                 break;
2359                 }
2360         } else if (*p == '\0') {
2361                 for (i=0; i<6; i++)
2362                         mask[i] = 0xff;
2363         }
2364         for (i=0; i<6; i++)
2365                 addr[i] &= mask[i];
2366 }
2367
2368 /*
2369  * helper function, updates the pointer to cmd with the length
2370  * of the current command, and also cleans up the first word of
2371  * the new command in case it has been clobbered before.
2372  */
2373 static ipfw_insn *
2374 next_cmd(ipfw_insn *cmd)
2375 {
2376         cmd += F_LEN(cmd);
2377         bzero(cmd, sizeof(*cmd));
2378         return cmd;
2379 }
2380
2381 /*
2382  * A function to fill simple commands of size 1.
2383  * Existing flags are preserved.
2384  */
2385 static void
2386 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2387 {
2388         cmd->opcode = opcode;
2389         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2390         cmd->arg1 = arg;
2391 }
2392
2393 /*
2394  * Fetch and add the MAC address and type, with masks. This generates one or
2395  * two microinstructions, and returns the pointer to the last one.
2396  */
2397 static ipfw_insn *
2398 add_mac(ipfw_insn *cmd, int ac, char *av[])
2399 {
2400         ipfw_insn_mac *mac;
2401
2402         if (ac < 2)
2403                 errx(EX_DATAERR, "MAC dst src");
2404
2405         cmd->opcode = O_MACADDR2;
2406         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2407
2408         mac = (ipfw_insn_mac *)cmd;
2409         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2410         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2411         return cmd;
2412 }
2413
2414 static ipfw_insn *
2415 add_mactype(ipfw_insn *cmd, int ac, char *av)
2416 {
2417         if (ac < 1)
2418                 errx(EX_DATAERR, "missing MAC type");
2419         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2420                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2421                 cmd->opcode = O_MAC_TYPE;
2422                 return cmd;
2423         } else
2424                 return NULL;
2425 }
2426
2427 static ipfw_insn *
2428 add_proto(ipfw_insn *cmd, char *av)
2429 {
2430         struct protoent *pe;
2431         u_char proto = 0;
2432
2433         if (!strncmp(av, "all", strlen(av)))
2434                 ; /* same as "ip" */
2435         else if ((proto = atoi(av)) > 0)
2436                 ; /* all done! */
2437         else if ((pe = getprotobyname(av)) != NULL)
2438                 proto = pe->p_proto;
2439         else
2440                 return NULL;
2441         if (proto != IPPROTO_IP)
2442                 fill_cmd(cmd, O_PROTO, 0, proto);
2443         return cmd;
2444 }
2445
2446 static ipfw_insn *
2447 add_srcip(ipfw_insn *cmd, char *av)
2448 {
2449         fill_ip((ipfw_insn_ip *)cmd, av);
2450         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2451                 cmd->opcode = O_IP_SRC_SET;
2452         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2453                 cmd->opcode = O_IP_SRC_ME;
2454         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2455                 cmd->opcode = O_IP_SRC;
2456         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2457                 cmd->opcode = O_IP_SRC_MASK;
2458         return cmd;
2459 }
2460
2461 static ipfw_insn *
2462 add_dstip(ipfw_insn *cmd, char *av)
2463 {
2464         fill_ip((ipfw_insn_ip *)cmd, av);
2465         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2466                 ;
2467         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2468                 cmd->opcode = O_IP_DST_ME;
2469         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2470                 cmd->opcode = O_IP_DST;
2471         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2472                 cmd->opcode = O_IP_DST_MASK;
2473         return cmd;
2474 }
2475
2476 static ipfw_insn *
2477 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2478 {
2479         if (!strncmp(av, "any", strlen(av))) {
2480                 return NULL;
2481         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2482                 /* XXX todo: check that we have a protocol with ports */
2483                 cmd->opcode = opcode;
2484                 return cmd;
2485         }
2486         return NULL;
2487 }
2488
2489 /*
2490  * Parse arguments and assemble the microinstructions which make up a rule.
2491  * Rules are added into the 'rulebuf' and then copied in the correct order
2492  * into the actual rule.
2493  *
2494  * The syntax for a rule starts with the action, followed by an
2495  * optional log action, and the various match patterns.
2496  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2497  * (generated if the rule includes a keep-state option), then the
2498  * various match patterns, the "log" action, and the actual action.
2499  *
2500  */
2501 static void
2502 add(int ac, char *av[])
2503 {
2504         /*
2505          * rules are added into the 'rulebuf' and then copied in
2506          * the correct order into the actual rule.
2507          * Some things that need to go out of order (prob, action etc.)
2508          * go into actbuf[].
2509          */
2510         static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
2511
2512         ipfw_insn *src, *dst, *cmd, *action, *prev;
2513         ipfw_insn *first_cmd;   /* first match pattern */
2514
2515         struct ip_fw *rule;
2516
2517         /*
2518          * various flags used to record that we entered some fields.
2519          */
2520         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2521
2522         int i;
2523
2524         int open_par = 0;       /* open parenthesis ( */
2525
2526         /* proto is here because it is used to fetch ports */
2527         u_char proto = IPPROTO_IP;      /* default protocol */
2528
2529         double match_prob = 1; /* match probability, default is always match */
2530
2531         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2532         bzero(cmdbuf, sizeof(cmdbuf));
2533         bzero(rulebuf, sizeof(rulebuf));
2534
2535         rule = (struct ip_fw *)rulebuf;
2536         cmd = (ipfw_insn *)cmdbuf;
2537         action = (ipfw_insn *)actbuf;
2538
2539         av++; ac--;
2540
2541         /* [rule N]     -- Rule number optional */
2542         if (ac && isdigit(**av)) {
2543                 rule->rulenum = atoi(*av);
2544                 av++;
2545                 ac--;
2546         }
2547
2548         /* [set N]      -- set number (0..30), optional */
2549         if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
2550                 int set = strtoul(av[1], NULL, 10);
2551                 if (set < 0 || set > 30)
2552                         errx(EX_DATAERR, "illegal set %s", av[1]);
2553                 rule->set = set;
2554                 av += 2; ac -= 2;
2555         }
2556
2557         /* [prob D]     -- match probability, optional */
2558         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2559                 match_prob = strtod(av[1], NULL);
2560
2561                 if (match_prob <= 0 || match_prob > 1)
2562                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2563                 av += 2; ac -= 2;
2564         }
2565
2566         /* action       -- mandatory */
2567         NEED1("missing action");
2568         i = match_token(rule_actions, *av);
2569         ac--; av++;
2570         action->len = 1;        /* default */
2571         switch(i) {
2572         case TOK_CHECKSTATE:
2573                 have_state = action;
2574                 action->opcode = O_CHECK_STATE;
2575                 break;
2576
2577         case TOK_ACCEPT:
2578                 action->opcode = O_ACCEPT;
2579                 break;
2580
2581         case TOK_DENY:
2582                 action->opcode = O_DENY;
2583                 action->arg1 = 0;
2584                 break;
2585
2586         case TOK_REJECT:
2587                 action->opcode = O_REJECT;
2588                 action->arg1 = ICMP_UNREACH_HOST;
2589                 break;
2590
2591         case TOK_RESET:
2592                 action->opcode = O_REJECT;
2593                 action->arg1 = ICMP_REJECT_RST;
2594                 break;
2595
2596         case TOK_UNREACH:
2597                 action->opcode = O_REJECT;
2598                 NEED1("missing reject code");
2599                 fill_reject_code(&action->arg1, *av);
2600                 ac--; av++;
2601                 break;
2602
2603         case TOK_COUNT:
2604                 action->opcode = O_COUNT;
2605                 break;
2606
2607         case TOK_QUEUE:
2608         case TOK_PIPE:
2609                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2610         case TOK_SKIPTO:
2611                 if (i == TOK_QUEUE)
2612                         action->opcode = O_QUEUE;
2613                 else if (i == TOK_PIPE)
2614                         action->opcode = O_PIPE;
2615                 else if (i == TOK_SKIPTO)
2616                         action->opcode = O_SKIPTO;
2617                 NEED1("missing skipto/pipe/queue number");
2618                 action->arg1 = strtoul(*av, NULL, 10);
2619                 av++; ac--;
2620                 break;
2621
2622         case TOK_DIVERT:
2623         case TOK_TEE:
2624                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2625                 NEED1("missing divert/tee port");
2626                 action->arg1 = strtoul(*av, NULL, 0);
2627                 if (action->arg1 == 0) {
2628                         struct servent *s;
2629                         setservent(1);
2630                         s = getservbyname(av[0], "divert");
2631                         if (s != NULL)
2632                                 action->arg1 = ntohs(s->s_port);
2633                         else
2634                                 errx(EX_DATAERR, "illegal divert/tee port");
2635                 }
2636                 ac--; av++;
2637                 break;
2638
2639         case TOK_FORWARD: {
2640                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2641                 char *s, *end;
2642
2643                 NEED1("missing forward address[:port]");
2644
2645                 action->opcode = O_FORWARD_IP;
2646                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2647
2648                 p->sa.sin_len = sizeof(struct sockaddr_in);
2649                 p->sa.sin_family = AF_INET;
2650                 p->sa.sin_port = 0;
2651                 /*
2652                  * locate the address-port separator (':' or ',')
2653                  */
2654                 s = strchr(*av, ':');
2655                 if (s == NULL)
2656                         s = strchr(*av, ',');
2657                 if (s != NULL) {
2658                         *(s++) = '\0';
2659                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2660                         if (s == end)
2661                                 errx(EX_DATAERR,
2662                                     "illegal forwarding port ``%s''", s);
2663                         p->sa.sin_port = (u_short)i;
2664                 }
2665                 lookup_host(*av, &(p->sa.sin_addr));
2666                 }
2667                 ac--; av++;
2668                 break;
2669
2670         default:
2671                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2672         }
2673         action = next_cmd(action);
2674
2675         /*
2676          * [log [logamount N]]  -- log, optional
2677          *
2678          * If exists, it goes first in the cmdbuf, but then it is
2679          * skipped in the copy section to the end of the buffer.
2680          */
2681         if (ac && !strncmp(*av, "log", strlen(*av))) {
2682                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2683
2684                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2685                 cmd->opcode = O_LOG;
2686                 av++; ac--;
2687                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2688                         ac--; av++;
2689                         NEED1("logamount requires argument");
2690                         c->max_log = atoi(*av);
2691                         if (c->max_log < 0)
2692                                 errx(EX_DATAERR, "logamount must be positive");
2693                         ac--; av++;
2694                 }
2695                 cmd = next_cmd(cmd);
2696         }
2697
2698         if (have_state) /* must be a check-state, we are done */
2699                 goto done;
2700
2701 #define OR_START(target)                                        \
2702         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2703                 if (open_par)                                   \
2704                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2705                 prev = NULL;                                    \
2706                 open_par = 1;                                   \
2707                 if ( (av[0])[1] == '\0') {                      \
2708                         ac--; av++;                             \
2709                 } else                                          \
2710                         (*av)++;                                \
2711         }                                                       \
2712         target:                                                 \
2713
2714
2715 #define CLOSE_PAR                                               \
2716         if (open_par) {                                         \
2717                 if (ac && (                                     \
2718                     !strncmp(*av, ")", strlen(*av)) ||          \
2719                     !strncmp(*av, "}", strlen(*av)) )) {        \
2720                         prev = NULL;                            \
2721                         open_par = 0;                           \
2722                         ac--; av++;                             \
2723                 } else                                          \
2724                         errx(EX_USAGE, "missing \")\"\n");      \
2725         }
2726
2727 #define NOT_BLOCK                                               \
2728         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2729                 if (cmd->len & F_NOT)                           \
2730                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2731                 cmd->len |= F_NOT;                              \
2732                 ac--; av++;                                     \
2733         }
2734
2735 #define OR_BLOCK(target)                                        \
2736         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2737                 if (prev == NULL || open_par == 0)              \
2738                         errx(EX_DATAERR, "invalid OR block");   \
2739                 prev->len |= F_OR;                              \
2740                 ac--; av++;                                     \
2741                 goto target;                                    \
2742         }                                                       \
2743         CLOSE_PAR;
2744
2745         first_cmd = cmd;
2746
2747 #if 0
2748         /*
2749          * MAC addresses, optional.
2750          * If we have this, we skip the part "proto from src to dst"
2751          * and jump straight to the option parsing.
2752          */
2753         NOT_BLOCK;
2754         NEED1("missing protocol");
2755         if (!strncmp(*av, "MAC", strlen(*av)) ||
2756             !strncmp(*av, "mac", strlen(*av))) {
2757                 ac--; av++;     /* the "MAC" keyword */
2758                 add_mac(cmd, ac, av); /* exits in case of errors */
2759                 cmd = next_cmd(cmd);
2760                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2761                 NOT_BLOCK;
2762                 NEED1("missing mac type");
2763                 if (add_mactype(cmd, ac, av[0]))
2764                         cmd = next_cmd(cmd);
2765                 ac--; av++;     /* any or mac-type */
2766                 goto read_options;
2767         }
2768 #endif
2769
2770         /*
2771          * protocol, mandatory
2772          */
2773     OR_START(get_proto);
2774         NOT_BLOCK;
2775         NEED1("missing protocol");
2776         if (add_proto(cmd, *av)) {
2777                 av++; ac--;
2778                 if (F_LEN(cmd) == 0)    /* plain IP */
2779                         proto = 0;
2780                 else {
2781                         proto = cmd->arg1;
2782                         prev = cmd;
2783                         cmd = next_cmd(cmd);
2784                 }
2785         } else if (first_cmd != cmd) {
2786                 errx(EX_DATAERR, "invalid protocol ``%s''", av);
2787         } else
2788                 goto read_options;
2789     OR_BLOCK(get_proto);
2790
2791         /*
2792          * "from", mandatory
2793          */
2794         if (!ac || strncmp(*av, "from", strlen(*av)))
2795                 errx(EX_USAGE, "missing ``from''");
2796         ac--; av++;
2797
2798         /*
2799          * source IP, mandatory
2800          */
2801     OR_START(source_ip);
2802         NOT_BLOCK;      /* optional "not" */
2803         NEED1("missing source address");
2804         if (add_srcip(cmd, *av)) {
2805                 ac--; av++;
2806                 if (F_LEN(cmd) != 0) {  /* ! any */
2807                         prev = cmd;
2808                         cmd = next_cmd(cmd);
2809                 }
2810         }
2811     OR_BLOCK(source_ip);
2812
2813         /*
2814          * source ports, optional
2815          */
2816         NOT_BLOCK;      /* optional "not" */
2817         if (ac) {
2818                 if (!strncmp(*av, "any", strlen(*av)) ||
2819                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2820                         ac--; av++;
2821                         if (F_LEN(cmd) != 0)
2822                                 cmd = next_cmd(cmd);
2823                 }
2824         }
2825
2826         /*
2827          * "to", mandatory
2828          */
2829         if (!ac || strncmp(*av, "to", strlen(*av)))
2830                 errx(EX_USAGE, "missing ``to''");
2831         av++; ac--;
2832
2833         /*
2834          * destination, mandatory
2835          */
2836     OR_START(dest_ip);
2837         NOT_BLOCK;      /* optional "not" */
2838         NEED1("missing dst address");
2839         if (add_dstip(cmd, *av)) {
2840                 ac--; av++;
2841                 if (F_LEN(cmd) != 0) {  /* ! any */
2842                         prev = cmd;
2843                         cmd = next_cmd(cmd);
2844                 }
2845         }
2846     OR_BLOCK(dest_ip);
2847
2848         /*
2849          * dest. ports, optional
2850          */
2851         NOT_BLOCK;      /* optional "not" */
2852         if (ac) {
2853                 if (!strncmp(*av, "any", strlen(*av)) ||
2854                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
2855                         ac--; av++;
2856                         if (F_LEN(cmd) != 0)
2857                                 cmd = next_cmd(cmd);
2858                 }
2859         }
2860
2861 read_options:
2862         if (ac && first_cmd == cmd) {
2863                 /*
2864                  * nothing specified so far, store in the rule to ease
2865                  * printout later.
2866                  */
2867                  rule->_pad = 1;
2868         }
2869         prev = NULL;
2870         while (ac) {
2871                 char *s;
2872                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
2873
2874                 s = *av;
2875                 cmd32 = (ipfw_insn_u32 *)cmd;
2876
2877                 if (*s == '!') {        /* alternate syntax for NOT */
2878                         if (cmd->len & F_NOT)
2879                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2880                         cmd->len = F_NOT;
2881                         s++;
2882                 }
2883                 i = match_token(rule_options, s);
2884                 ac--; av++;
2885                 switch(i) {
2886                 case TOK_NOT:
2887                         if (cmd->len & F_NOT)
2888                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2889                         cmd->len = F_NOT;
2890                         break;
2891
2892                 case TOK_OR:
2893                         if (open_par == 0 || prev == NULL)
2894                                 errx(EX_USAGE, "invalid \"or\" block\n");
2895                         prev->len |= F_OR;
2896                         break;
2897
2898                 case TOK_STARTBRACE:
2899                         if (open_par)
2900                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
2901                         open_par = 1;
2902                         break;
2903
2904                 case TOK_ENDBRACE:
2905                         if (!open_par)
2906                                 errx(EX_USAGE, "+missing \")\"\n");
2907                         open_par = 0;
2908                         prev = NULL;
2909                         break;
2910
2911                 case TOK_IN:
2912                         fill_cmd(cmd, O_IN, 0, 0);
2913                         break;
2914
2915                 case TOK_OUT:
2916                         cmd->len ^= F_NOT; /* toggle F_NOT */
2917                         fill_cmd(cmd, O_IN, 0, 0);
2918                         break;
2919
2920                 case TOK_FRAG:
2921                         fill_cmd(cmd, O_FRAG, 0, 0);
2922                         break;
2923
2924                 case TOK_LAYER2:
2925                         fill_cmd(cmd, O_LAYER2, 0, 0);
2926                         break;
2927
2928                 case TOK_XMIT:
2929                 case TOK_RECV:
2930                 case TOK_VIA:
2931                         NEED1("recv, xmit, via require interface name"
2932                                 " or address");
2933                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2934                         ac--; av++;
2935                         if (F_LEN(cmd) == 0)    /* not a valid address */
2936                                 break;
2937                         if (i == TOK_XMIT)
2938                                 cmd->opcode = O_XMIT;
2939                         else if (i == TOK_RECV)
2940                                 cmd->opcode = O_RECV;
2941                         else if (i == TOK_VIA)
2942                                 cmd->opcode = O_VIA;
2943                         break;
2944
2945                 case TOK_ICMPTYPES:
2946                         NEED1("icmptypes requires list of types");
2947                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
2948                         av++; ac--;
2949                         break;
2950
2951                 case TOK_IPTTL:
2952                         NEED1("ipttl requires TTL");
2953                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2954                         ac--; av++;
2955                         break;
2956
2957                 case TOK_IPID:
2958                         NEED1("ipid requires length");
2959                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2960                         ac--; av++;
2961                         break;
2962
2963                 case TOK_IPLEN:
2964                         NEED1("iplen requires length");
2965                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2966                         ac--; av++;
2967                         break;
2968
2969                 case TOK_IPVER:
2970                         NEED1("ipver requires version");
2971                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2972                         ac--; av++;
2973                         break;
2974
2975                 case TOK_IPPRECEDENCE:
2976                         NEED1("ipprecedence requires value");
2977                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
2978                             (strtoul(*av, NULL, 0) & 7) << 5);
2979                         ac--; av++;
2980                         break;
2981
2982                 case TOK_IPOPTS:
2983                         NEED1("missing argument for ipoptions");
2984                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
2985                         ac--; av++;
2986                         break;
2987
2988                 case TOK_IPTOS:
2989                         NEED1("missing argument for iptos");
2990                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
2991                         ac--; av++;
2992                         break;
2993
2994                 case TOK_UID:
2995                         NEED1("uid requires argument");
2996                     {
2997                         char *end;
2998                         uid_t uid;
2999                         struct passwd *pwd;
3000
3001                         cmd->opcode = O_UID;
3002                         uid = strtoul(*av, &end, 0);
3003                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3004                         if (pwd == NULL)
3005                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3006                         cmd32->d[0] = pwd->pw_uid;
3007                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3008                         ac--; av++;
3009                     }
3010                         break;
3011
3012                 case TOK_GID:
3013                         NEED1("gid requires argument");
3014                     {
3015                         char *end;
3016                         gid_t gid;
3017                         struct group *grp;
3018
3019                         cmd->opcode = O_GID;
3020                         gid = strtoul(*av, &end, 0);
3021                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3022                         if (grp == NULL)
3023                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3024                         cmd32->d[0] = grp->gr_gid;
3025                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3026                         ac--; av++;
3027                     }
3028                         break;
3029
3030                 case TOK_ESTAB:
3031                         fill_cmd(cmd, O_ESTAB, 0, 0);
3032                         break;
3033
3034                 case TOK_SETUP:
3035                         fill_cmd(cmd, O_TCPFLAGS, 0,
3036                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3037                         break;
3038
3039                 case TOK_TCPOPTS:
3040                         NEED1("missing argument for tcpoptions");
3041                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3042                         ac--; av++;
3043                         break;
3044
3045                 case TOK_TCPSEQ:
3046                 case TOK_TCPACK:
3047                         NEED1("tcpseq/tcpack requires argument");
3048                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3049                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3050                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3051                         ac--; av++;
3052                         break;
3053
3054                 case TOK_TCPWIN:
3055                         NEED1("tcpwin requires length");
3056                         fill_cmd(cmd, O_TCPWIN, 0,
3057                             htons(strtoul(*av, NULL, 0)));
3058                         ac--; av++;
3059                         break;
3060
3061                 case TOK_TCPFLAGS:
3062                         NEED1("missing argument for tcpflags");
3063                         cmd->opcode = O_TCPFLAGS;
3064                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3065                         ac--; av++;
3066                         break;
3067
3068                 case TOK_KEEPSTATE:
3069                         if (open_par)
3070                                 errx(EX_USAGE, "keep-state cannot be part "
3071                                     "of an or block");
3072                         if (have_state)
3073                                 errx(EX_USAGE, "only one of keep-state "
3074                                         "and limit is allowed");
3075                         have_state = cmd;
3076                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3077                         break;
3078
3079                 case TOK_LIMIT:
3080                         if (open_par)
3081                                 errx(EX_USAGE, "limit cannot be part "
3082                                     "of an or block");
3083                         if (have_state)
3084                                 errx(EX_USAGE, "only one of keep-state "
3085                                         "and limit is allowed");
3086                         NEED1("limit needs mask and # of connections");
3087                         have_state = cmd;
3088                     {
3089                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3090
3091                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3092                         cmd->opcode = O_LIMIT;
3093                         c->limit_mask = 0;
3094                         c->conn_limit = 0;
3095                         for (; ac >1 ;) {
3096                                 int val;
3097
3098                                 val = match_token(limit_masks, *av);
3099                                 if (val <= 0)
3100                                         break;
3101                                 c->limit_mask |= val;
3102                                 ac--; av++;
3103                         }
3104                         c->conn_limit = atoi(*av);
3105                         if (c->conn_limit == 0)
3106                                 errx(EX_USAGE, "limit: limit must be >0");
3107                         if (c->limit_mask == 0)
3108                                 errx(EX_USAGE, "missing limit mask");
3109                         ac--; av++;
3110                     }
3111                         break;
3112
3113                 case TOK_PROTO:
3114                         NEED1("missing protocol");
3115                         if (add_proto(cmd, *av)) {
3116                                 proto = cmd->arg1;
3117                                 ac--; av++;
3118                         } else
3119                                 errx(EX_DATAERR, "invalid protocol ``%s''", av);
3120                         break;
3121
3122                 case TOK_SRCIP:
3123                         NEED1("missing source IP");
3124                         if (add_srcip(cmd, *av)) {
3125                                 ac--; av++;
3126                         }
3127                         break;
3128
3129                 case TOK_DSTIP:
3130                         NEED1("missing destination IP");
3131                         if (add_dstip(cmd, *av)) {
3132                                 ac--; av++;
3133                         }
3134                         break;
3135
3136                 case TOK_SRCPORT:
3137                         NEED1("missing source port");
3138                         if (!strncmp(*av, "any", strlen(*av)) ||
3139                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3140                                 ac--; av++;
3141                         } else
3142                                 errx(EX_DATAERR, "invalid source port %s", *av);
3143                         break;
3144
3145                 case TOK_DSTPORT:
3146                         NEED1("missing destination port");
3147                         if (!strncmp(*av, "any", strlen(*av)) ||
3148                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3149                                 ac--; av++;
3150                         } else
3151                                 errx(EX_DATAERR, "invalid destination port %s",
3152                                     *av);
3153                         break;
3154
3155                 case TOK_MAC:
3156                         if (ac < 2)
3157                                 errx(EX_USAGE, "MAC dst-mac src-mac");
3158                         if (add_mac(cmd, ac, av)) {
3159                                 ac -= 2; av += 2;
3160                         }
3161                         break;
3162
3163                 case TOK_MACTYPE:
3164                         NEED1("missing mac type");
3165                         if (!add_mactype(cmd, ac, *av))
3166                                 errx(EX_DATAERR, "invalid mac type %s", av);
3167                         ac--; av++;
3168                         break;
3169
3170                 default:
3171                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3172                 }
3173                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3174                         prev = cmd;
3175                         cmd = next_cmd(cmd);
3176                 }
3177         }
3178
3179 done:
3180         /*
3181          * Now copy stuff into the rule.
3182          * If we have a keep-state option, the first instruction
3183          * must be a PROBE_STATE (which is generated here).
3184          * If we have a LOG option, it was stored as the first command,
3185          * and now must be moved to the top of the action part.
3186          */
3187         dst = (ipfw_insn *)rule->cmd;
3188
3189         /*
3190          * First thing to write into the command stream is the match probability.
3191          */
3192         if (match_prob != 1) { /* 1 means always match */
3193                 dst->opcode = O_PROB;
3194                 dst->len = 2;
3195                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3196                 dst += dst->len;
3197         }
3198
3199         /*
3200          * generate O_PROBE_STATE if necessary
3201          */
3202         if (have_state && have_state->opcode != O_CHECK_STATE) {
3203                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3204                 dst = next_cmd(dst);
3205         }
3206         /*
3207          * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT
3208          */
3209         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3210                 i = F_LEN(src);
3211
3212                 switch (src->opcode) {
3213                 case O_LOG:
3214                 case O_KEEP_STATE:
3215                 case O_LIMIT:
3216                         break;
3217                 default:
3218                         bcopy(src, dst, i * sizeof(u_int32_t));
3219                         dst += i;
3220                 }
3221         }
3222
3223         /*
3224          * put back the have_state command as last opcode
3225          */
3226         if (have_state && have_state->opcode != O_CHECK_STATE) {
3227                 i = F_LEN(have_state);
3228                 bcopy(have_state, dst, i * sizeof(u_int32_t));
3229                 dst += i;
3230         }
3231         /*
3232          * start action section
3233          */
3234         rule->act_ofs = dst - rule->cmd;
3235
3236         /*
3237          * put back O_LOG if necessary
3238          */
3239         src = (ipfw_insn *)cmdbuf;
3240         if ( src->opcode == O_LOG ) {
3241                 i = F_LEN(src);
3242                 bcopy(src, dst, i * sizeof(u_int32_t));
3243                 dst += i;
3244         }
3245         /*
3246          * copy all other actions
3247          */
3248         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3249                 i = F_LEN(src);
3250                 bcopy(src, dst, i * sizeof(u_int32_t));
3251                 dst += i;
3252         }
3253
3254         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
3255         i = (void *)dst - (void *)rule;
3256         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
3257                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3258         if (!do_quiet)
3259                 show_ipfw(rule, 10, 10);
3260 }
3261
3262 static void
3263 zero(int ac, char *av[])
3264 {
3265         int rulenum;
3266         int failed = EX_OK;
3267
3268         av++; ac--;
3269
3270         if (!ac) {
3271                 /* clear all entries */
3272                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
3273                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
3274                 if (!do_quiet)
3275                         printf("Accounting cleared.\n");
3276
3277                 return;
3278         }
3279
3280         while (ac) {
3281                 /* Rule number */
3282                 if (isdigit(**av)) {
3283                         rulenum = atoi(*av);
3284                         av++;
3285                         ac--;
3286                         if (setsockopt(s, IPPROTO_IP,
3287                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
3288                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
3289                                     rulenum);
3290                                 failed = EX_UNAVAILABLE;
3291                         } else if (!do_quiet)
3292                                 printf("Entry %d cleared\n", rulenum);
3293                 } else {
3294                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3295                 }
3296         }
3297         if (failed != EX_OK)
3298                 exit(failed);
3299 }
3300
3301 static void
3302 resetlog(int ac, char *av[])
3303 {
3304         int rulenum;
3305         int failed = EX_OK;
3306
3307         av++; ac--;
3308
3309         if (!ac) {
3310                 /* clear all entries */
3311                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
3312                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
3313                 if (!do_quiet)
3314                         printf("Logging counts reset.\n");
3315
3316                 return;
3317         }
3318
3319         while (ac) {
3320                 /* Rule number */
3321                 if (isdigit(**av)) {
3322                         rulenum = atoi(*av);
3323                         av++;
3324                         ac--;
3325                         if (setsockopt(s, IPPROTO_IP,
3326                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
3327                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
3328                                     rulenum);
3329                                 failed = EX_UNAVAILABLE;
3330                         } else if (!do_quiet)
3331                                 printf("Entry %d logging count reset\n",
3332                                     rulenum);
3333                 } else {
3334                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
3335                 }
3336         }
3337         if (failed != EX_OK)
3338                 exit(failed);
3339 }
3340
3341 static void
3342 flush()
3343 {
3344         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3345
3346         if (!do_force && !do_quiet) { /* need to ask user */
3347                 int c;
3348
3349                 printf("Are you sure? [yn] ");
3350                 fflush(stdout);
3351                 do {
3352                         c = toupper(getc(stdin));
3353                         while (c != '\n' && getc(stdin) != '\n')
3354                                 if (feof(stdin))
3355                                         return; /* and do not flush */
3356                 } while (c != 'Y' && c != 'N');
3357                 printf("\n");
3358                 if (c == 'N')   /* user said no */
3359                         return;
3360         }
3361         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
3362                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3363                     do_pipe ? "DUMMYNET" : "FW");
3364         if (!do_quiet)
3365                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
3366 }
3367
3368 static int
3369 ipfw_main(int ac, char **av)
3370 {
3371         int ch;
3372
3373         if (ac == 1)
3374                 show_usage();
3375
3376         /* Set the force flag for non-interactive processes */
3377         do_force = !isatty(STDIN_FILENO);
3378
3379         optind = optreset = 1;
3380         while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
3381                 switch (ch) {
3382                 case 'h': /* help */
3383                         help();
3384                         break;  /* NOTREACHED */
3385
3386                 case 's': /* sort */
3387                         do_sort = atoi(optarg);
3388                         break;
3389                 case 'a':
3390                         do_acct = 1;
3391                         break;
3392                 case 'c':
3393                         do_compact = 1;
3394                         break;
3395                 case 'd':
3396                         do_dynamic = 1;
3397                         break;
3398                 case 'e':
3399                         do_expired = 1;
3400                         break;
3401                 case 'f':
3402                         do_force = 1;
3403                         break;
3404                 case 'N':
3405                         do_resolv = 1;
3406                         break;
3407                 case 'q':
3408                         do_quiet = 1;
3409                         break;
3410                 case 'S':
3411                         show_sets = 1;
3412                         break;
3413                 case 't':
3414                         do_time = 1;
3415                         break;
3416                 case 'v': /* verbose */
3417                         verbose++;
3418                         break;
3419                 default:
3420                         show_usage();
3421                 }
3422
3423         ac -= optind;
3424         av += optind;
3425         NEED1("bad arguments, for usage summary ``ipfw''");
3426
3427         /*
3428          * optional: pipe or queue
3429          */
3430         if (!strncmp(*av, "pipe", strlen(*av))) {
3431                 do_pipe = 1;
3432                 ac--;
3433                 av++;
3434         } else if (!strncmp(*av, "queue", strlen(*av))) {
3435                 do_pipe = 2;
3436                 ac--;
3437                 av++;
3438         }
3439         NEED1("missing command");
3440
3441         /*
3442          * for pipes and queues we normally say 'pipe NN config'
3443          * but the code is easier to parse as 'pipe config NN'
3444          * so we swap the two arguments.
3445          */
3446         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
3447                 char *p = av[0];
3448                 av[0] = av[1];
3449                 av[1] = p;
3450         }
3451         if (!strncmp(*av, "add", strlen(*av)))
3452                 add(ac, av);
3453         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
3454                 config_pipe(ac, av);
3455         else if (!strncmp(*av, "delete", strlen(*av)))
3456                 delete(ac, av);
3457         else if (!strncmp(*av, "flush", strlen(*av)))
3458                 flush();
3459         else if (!strncmp(*av, "zero", strlen(*av)))
3460                 zero(ac, av);
3461         else if (!strncmp(*av, "resetlog", strlen(*av)))
3462                 resetlog(ac, av);
3463         else if (!strncmp(*av, "print", strlen(*av)) ||
3464                  !strncmp(*av, "list", strlen(*av)))
3465                 list(ac, av);
3466         else if (!strncmp(*av, "enable", strlen(*av)))
3467                 sysctl_handler(ac, av, 1);
3468         else if (!strncmp(*av, "disable", strlen(*av)))
3469                 sysctl_handler(ac, av, 0);
3470         else if (!strncmp(*av, "set", strlen(*av)))
3471                 sets_handler(ac, av);
3472         else if (!strncmp(*av, "show", strlen(*av))) {
3473                 do_acct++;
3474                 list(ac, av);
3475         } else
3476                 errx(EX_USAGE, "bad command `%s'", *av);
3477         return 0;
3478 }
3479
3480
3481 static void
3482 ipfw_readfile(int ac, char *av[])
3483 {
3484 #define MAX_ARGS        32
3485 #define WHITESP         " \t\f\v\n\r"
3486         char    buf[BUFSIZ];
3487         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3488         char    linename[10];
3489         int     i=0, lineno=0, qflag=0, pflag=0, status;
3490         FILE    *f = NULL;
3491         pid_t   preproc = 0;
3492         int     c;
3493
3494         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3495                 switch(c) {
3496                 case 'D':
3497                         if (!pflag)
3498                                 errx(EX_USAGE, "-D requires -p");
3499                         if (i > MAX_ARGS - 2)
3500                                 errx(EX_USAGE,
3501                                      "too many -D or -U options");
3502                         args[i++] = "-D";
3503                         args[i++] = optarg;
3504                         break;
3505
3506                 case 'U':
3507                         if (!pflag)
3508                                 errx(EX_USAGE, "-U requires -p");
3509                         if (i > MAX_ARGS - 2)
3510                                 errx(EX_USAGE,
3511                                      "too many -D or -U options");
3512                         args[i++] = "-U";
3513                         args[i++] = optarg;
3514                         break;
3515
3516                 case 'p':
3517                         pflag = 1;
3518                         cmd = optarg;
3519                         args[0] = cmd;
3520                         i = 1;
3521                         break;
3522
3523                 case 'q':
3524                         qflag = 1;
3525                         break;
3526
3527                 default:
3528                         errx(EX_USAGE, "bad arguments, for usage"
3529                              " summary ``ipfw''");
3530                 }
3531
3532         av += optind;
3533         ac -= optind;
3534         if (ac != 1)
3535                 errx(EX_USAGE, "extraneous filename arguments");
3536
3537         if ((f = fopen(av[0], "r")) == NULL)
3538                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3539
3540         if (pflag) {
3541                 /* pipe through preprocessor (cpp or m4) */
3542                 int pipedes[2];
3543
3544                 args[i] = 0;
3545
3546                 if (pipe(pipedes) == -1)
3547                         err(EX_OSERR, "cannot create pipe");
3548
3549                 switch((preproc = fork())) {
3550                 case -1:
3551                         err(EX_OSERR, "cannot fork");
3552
3553                 case 0:
3554                         /* child */
3555                         if (dup2(fileno(f), 0) == -1
3556                             || dup2(pipedes[1], 1) == -1)
3557                                 err(EX_OSERR, "dup2()");
3558                         fclose(f);
3559                         close(pipedes[1]);
3560                         close(pipedes[0]);
3561                         execvp(cmd, args);
3562                         err(EX_OSERR, "execvp(%s) failed", cmd);
3563
3564                 default:
3565                         /* parent */
3566                         fclose(f);
3567                         close(pipedes[1]);
3568                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3569                                 int savederrno = errno;
3570
3571                                 (void)kill(preproc, SIGTERM);
3572                                 errno = savederrno;
3573                                 err(EX_OSERR, "fdopen()");
3574                         }
3575                 }
3576         }
3577
3578         while (fgets(buf, BUFSIZ, f)) {
3579                 lineno++;
3580                 sprintf(linename, "Line %d", lineno);
3581                 args[0] = linename;
3582
3583                 if (*buf == '#')
3584                         continue;
3585                 if ((p = strchr(buf, '#')) != NULL)
3586                         *p = '\0';
3587                 i = 1;
3588                 if (qflag)
3589                         args[i++] = "-q";
3590                 for (a = strtok(buf, WHITESP);
3591                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3592                         args[i] = a;
3593                 if (i == (qflag? 2: 1))
3594                         continue;
3595                 if (i == MAX_ARGS)
3596                         errx(EX_USAGE, "%s: too many arguments",
3597                             linename);
3598                 args[i] = NULL;
3599
3600                 ipfw_main(i, args);
3601         }
3602         fclose(f);
3603         if (pflag) {
3604                 if (waitpid(preproc, &status, 0) == -1)
3605                         errx(EX_OSERR, "waitpid()");
3606                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3607                         errx(EX_UNAVAILABLE,
3608                             "preprocessor exited with status %d",
3609                             WEXITSTATUS(status));
3610                 else if (WIFSIGNALED(status))
3611                         errx(EX_UNAVAILABLE,
3612                             "preprocessor exited with signal %d",
3613                             WTERMSIG(status));
3614         }
3615 }
3616
3617 int
3618 main(int ac, char *av[])
3619 {
3620         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3621         if (s < 0)
3622                 err(EX_UNAVAILABLE, "socket");
3623
3624         /*
3625          * If the last argument is an absolute pathname, interpret it
3626          * as a file to be preprocessed.
3627          */
3628
3629         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3630                 ipfw_readfile(ac, av);
3631         else
3632                 ipfw_main(ac, av);
3633         return EX_OK;
3634 }