bsd/netinet/ip_fw2.h

   1 /*
   2  * Copyright (c) 2008-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  * Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * $FreeBSD: src/sys/netinet/ip_fw2.h,v 1.1.2.4 2003/07/17 06:03:39 luigi Exp $
  54  */
  55
  56 #ifndef _IPFW2_H
  57 #define _IPFW2_H
  58 #ifdef __APPLE_API_OBSOLETE
  59
  60 /*
  61  * Define IP Firewall event subclass, and associated events.
  62  */
  63
  64 /*!
  65         @defined KEV_IPFW_SUBCLASS
  66         @discussion The kernel event subclass for IP Firewall.
  67 */
  68 #define KEV_IPFW_SUBCLASS       1
  69
  70 /*!
  71         @defined KEV_IPFW_ADD
  72         @discussion The event code indicating a rule has been added.
  73 */
  74 #define KEV_IPFW_ADD            1
  75
  76 /*!
  77         @defined KEV_IPFW_DEL
  78         @discussion The event code indicating a rule has been removed.
  79 */
  80 #define KEV_IPFW_DEL            2
  81
  82 /*!
  83         @defined KEV_IPFW_FLUSH
  84         @discussion The event code indicating the rule set has been flushed.
  85 */
  86 #define KEV_IPFW_FLUSH          3
  87
  88 /*!
  89         @defined KEV_IPFW_ENABLE
  90         @discussion The event code indicating the enable flag has been changed
  91 */
  92 #define KEV_IPFW_ENABLE         4
  93
  94
  95
  96 /*
  97  * The kernel representation of ipfw rules is made of a list of
  98  * 'instructions' (for all practical purposes equivalent to BPF
  99  * instructions), which specify which fields of the packet
 100  * (or its metadata) should be analysed.
 101  *
 102  * Each instruction is stored in a structure which begins with
 103  * "ipfw_insn", and can contain extra fields depending on the
 104  * instruction type (listed below).
 105  * Note that the code is written so that individual instructions
 106  * have a size which is a multiple of 32 bits. This means that, if
 107  * such structures contain pointers or other 64-bit entities,
 108  * (there is just one instance now) they may end up unaligned on
 109  * 64-bit architectures, so the must be handled with care.
 110  *
 111  * "enum ipfw_opcodes" are the opcodes supported. We can have up
 112  * to 256 different opcodes.
 113  */
 114
 115 enum ipfw_opcodes {             /* arguments (4 byte each)      */
 116         O_NOP,
 117
 118         O_IP_SRC,               /* u32 = IP                     */
 119         O_IP_SRC_MASK,          /* ip = IP/mask                 */
 120         O_IP_SRC_ME,            /* none                         */
 121         O_IP_SRC_SET,           /* u32=base, arg1=len, bitmap   */
 122
 123         O_IP_DST,               /* u32 = IP                     */
 124         O_IP_DST_MASK,          /* ip = IP/mask                 */
 125         O_IP_DST_ME,            /* none                         */
 126         O_IP_DST_SET,           /* u32=base, arg1=len, bitmap   */
 127
 128         O_IP_SRCPORT,           /* (n)port list:mask 4 byte ea  */
 129         O_IP_DSTPORT,           /* (n)port list:mask 4 byte ea  */
 130         O_PROTO,                /* arg1=protocol                */
 131
 132         O_MACADDR2,             /* 2 mac addr:mask              */
 133         O_MAC_TYPE,             /* same as srcport              */
 134
 135         O_LAYER2,               /* none                         */
 136         O_IN,                   /* none                         */
 137         O_FRAG,                 /* none                         */
 138
 139         O_RECV,                 /* none                         */
 140         O_XMIT,                 /* none                         */
 141         O_VIA,                  /* none                         */
 142
 143         O_IPOPT,                /* arg1 = 2*u8 bitmap           */
 144         O_IPLEN,                /* arg1 = len                   */
 145         O_IPID,                 /* arg1 = id                    */
 146
 147         O_IPTOS,                /* arg1 = id                    */
 148         O_IPPRECEDENCE,         /* arg1 = precedence << 5       */
 149         O_IPTTL,                /* arg1 = TTL                   */
 150
 151         O_IPVER,                /* arg1 = version               */
 152         O_UID,                  /* u32 = id                     */
 153         O_GID,                  /* u32 = id                     */
 154         O_ESTAB,                /* none (tcp established)       */
 155         O_TCPFLAGS,             /* arg1 = 2*u8 bitmap           */
 156         O_TCPWIN,               /* arg1 = desired win           */
 157         O_TCPSEQ,               /* u32 = desired seq.           */
 158         O_TCPACK,               /* u32 = desired seq.           */
 159         O_ICMPTYPE,             /* u32 = icmp bitmap            */
 160         O_TCPOPTS,              /* arg1 = 2*u8 bitmap           */
 161
 162         O_VERREVPATH,           /* none                         */
 163
 164         O_PROBE_STATE,          /* none                         */
 165         O_KEEP_STATE,           /* none                         */
 166         O_LIMIT,                /* ipfw_insn_limit              */
 167         O_LIMIT_PARENT,         /* dyn_type, not an opcode.     */
 168
 169         /*
 170          * These are really 'actions'.
 171          */
 172
 173         O_LOG,                  /* ipfw_insn_log                */
 174         O_PROB,                 /* u32 = match probability      */
 175
 176         O_CHECK_STATE,          /* none                         */
 177         O_ACCEPT,               /* none                         */
 178         O_DENY,                 /* none                         */
 179         O_REJECT,               /* arg1=icmp arg (same as deny) */
 180         O_COUNT,                /* none                         */
 181         O_SKIPTO,               /* arg1=next rule number        */
 182         O_PIPE,                 /* arg1=pipe number             */
 183         O_QUEUE,                /* arg1=queue number            */
 184         O_DIVERT,               /* arg1=port number             */
 185         O_TEE,                  /* arg1=port number             */
 186         O_FORWARD_IP,           /* fwd sockaddr                 */
 187         O_FORWARD_MAC,          /* fwd mac                      */
 188
 189         /*
 190          * More opcodes.
 191          */
 192         O_IPSEC,                /* has ipsec history            */
 193
 194         O_LAST_OPCODE           /* not an opcode!               */
 195 };
 196
 197 /*
 198  * Template for instructions.
 199  *
 200  * ipfw_insn is used for all instructions which require no operands,
 201  * a single 16-bit value (arg1), or a couple of 8-bit values.
 202  *
 203  * For other instructions which require different/larger arguments
 204  * we have derived structures, ipfw_insn_*.
 205  *
 206  * The size of the instruction (in 32-bit words) is in the low
 207  * 6 bits of "len". The 2 remaining bits are used to implement
 208  * NOT and OR on individual instructions. Given a type, you can
 209  * compute the length to be put in "len" using F_INSN_SIZE(t)
 210  *
 211  * F_NOT        negates the match result of the instruction.
 212  *
 213  * F_OR         is used to build or blocks. By default, instructions
 214  *              are evaluated as part of a logical AND. An "or" block
 215  *              { X or Y or Z } contains F_OR set in all but the last
 216  *              instruction of the block. A match will cause the code
 217  *              to skip past the last instruction of the block.
 218  *
 219  * NOTA BENE: in a couple of places we assume that
 220  *      sizeof(ipfw_insn) == sizeof(u_int32_t)
 221  * this needs to be fixed.
 222  *
 223  */
 224 typedef struct  _ipfw_insn {    /* template for instructions */
 225         enum ipfw_opcodes       opcode:8;
 226         u_int8_t        len;    /* numer of 32-byte words */
 227 #define F_NOT           0x80
 228 #define F_OR            0x40
 229 #define F_LEN_MASK      0x3f
 230 #define F_LEN(cmd)      ((cmd)->len & F_LEN_MASK)
 231
 232         u_int16_t       arg1;
 233 } ipfw_insn;
 234
 235 /*
 236  * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
 237  * a given type.
 238  */
 239 #define F_INSN_SIZE(t)  ((sizeof (t))/sizeof(u_int32_t))
 240
 241 /*
 242  * This is used to store an array of 16-bit entries (ports etc.)
 243  */
 244 typedef struct  _ipfw_insn_u16 {
 245         ipfw_insn o;
 246         u_int16_t ports[2];     /* there may be more */
 247 } ipfw_insn_u16;
 248
 249 /*
 250  * This is used to store an array of 32-bit entries
 251  * (uid, single IPv4 addresses etc.)
 252  */
 253 typedef struct  _ipfw_insn_u32 {
 254         ipfw_insn o;
 255         u_int32_t d[1]; /* one or more */
 256 } ipfw_insn_u32;
 257
 258 /*
 259  * This is used to store IP addr-mask pairs.
 260  */
 261 typedef struct  _ipfw_insn_ip {
 262         ipfw_insn o;
 263         struct in_addr  addr;
 264         struct in_addr  mask;
 265 } ipfw_insn_ip;
 266
 267 /*
 268  * This is used to forward to a given address (ip).
 269  */
 270 typedef struct  _ipfw_insn_sa {
 271         ipfw_insn o;
 272         struct sockaddr_in sa;
 273 } ipfw_insn_sa;
 274
 275 /*
 276  * This is used for MAC addr-mask pairs.
 277  */
 278 typedef struct  _ipfw_insn_mac {
 279         ipfw_insn o;
 280         u_char addr[12];        /* dst[6] + src[6] */
 281         u_char mask[12];        /* dst[6] + src[6] */
 282 } ipfw_insn_mac;
 283
 284 /*
 285  * This is used for interface match rules (recv xx, xmit xx).
 286  */
 287 typedef struct  _ipfw_insn_if {
 288         ipfw_insn o;
 289         union {
 290                 struct in_addr ip;
 291                 int32_t unit;
 292         } p;
 293         char name[IFNAMSIZ];
 294 } ipfw_insn_if;
 295
 296 /*
 297  * This is used for pipe and queue actions, which need to store
 298  * a single pointer (which can have different size on different
 299  * architectures.
 300  * Note that, because of previous instructions, pipe_ptr might
 301  * be unaligned in the overall structure, so it needs to be
 302  * manipulated with care.
 303  */
 304 typedef struct  _ipfw_insn_pipe {
 305         ipfw_insn       o;
 306         void            *pipe_ptr;      /* XXX */
 307 } ipfw_insn_pipe;
 308
 309 /*
 310  * This is used for limit rules.
 311  */
 312 typedef struct  _ipfw_insn_limit {
 313         ipfw_insn o;
 314         u_int8_t _pad;
 315         u_int8_t limit_mask;    /* combination of DYN_* below   */
 316 #define DYN_SRC_ADDR    0x1
 317 #define DYN_SRC_PORT    0x2
 318 #define DYN_DST_ADDR    0x4
 319 #define DYN_DST_PORT    0x8
 320
 321         u_int16_t conn_limit;
 322 } ipfw_insn_limit;
 323
 324 /*
 325  * This is used for log instructions.
 326  */
 327 typedef struct  _ipfw_insn_log {
 328         ipfw_insn o;
 329         u_int32_t max_log;      /* how many do we log -- 0 = all */
 330         u_int32_t log_left;     /* how many left to log         */
 331 } ipfw_insn_log;
 332
 333 /* Version of this API */
 334 #define IP_FW_VERSION_NONE 0
 335 #define IP_FW_VERSION_0 10      /* old ipfw */
 336 #define IP_FW_VERSION_1 20      /* ipfw in Jaguar/Panther */
 337 #define IP_FW_VERSION_2 30      /* ipfw2 */
 338 #define IP_FW_CURRENT_API_VERSION IP_FW_VERSION_2
 339
 340 /*
 341  * Here we have the structure representing an ipfw rule.
 342  *
 343  * It starts with a general area (with link fields and counters)
 344  * followed by an array of one or more instructions, which the code
 345  * accesses as an array of 32-bit values.
 346  *
 347  * Given a rule pointer  r:
 348  *
 349  *  r->cmd              is the start of the first instruction.
 350  *  ACTION_PTR(r)       is the start of the first action (things to do
 351  *                      once a rule matched).
 352  *
 353  * When assembling instruction, remember the following:
 354  *
 355  *  + if a rule has a "keep-state" (or "limit") option, then the
 356  *      first instruction (at r->cmd) MUST BE an O_PROBE_STATE
 357  *  + if a rule has a "log" option, then the first action
 358  *      (at ACTION_PTR(r)) MUST be O_LOG
 359  *
 360  * NOTE: we use a simple linked list of rules because we never need
 361  *      to delete a rule without scanning the list. We do not use
 362  *      queue(3) macros for portability and readability.
 363  */
 364
 365 struct ip_fw {
 366         u_int32_t version;              /* Version of this structure. MUST be set */
 367                                                         /* by clients. Should always be */
 368                                                         /* set to IP_FW_CURRENT_API_VERSION. */
 369         void *context;                  /* Context that is usable by user processes to */
 370                                                         /* identify this rule. */
 371         struct ip_fw    *next;          /* linked list of rules         */
 372         struct ip_fw    *next_rule;     /* ptr to next [skipto] rule    */
 373         /* 'next_rule' is used to pass up 'set_disable' status          */
 374
 375         u_int16_t       act_ofs;        /* offset of action in 32-bit units */
 376         u_int16_t       cmd_len;        /* # of 32-bit words in cmd     */
 377         u_int16_t       rulenum;        /* rule number                  */
 378         u_int8_t        set;            /* rule set (0..31)             */
 379         u_int32_t       set_masks[2];   /* masks for manipulating sets atomically */
 380 #define RESVD_SET       31      /* set for default and persistent rules */
 381         u_int8_t        _pad;           /* padding                      */
 382
 383         /* These fields are present in all rules.                       */
 384         u_int64_t       pcnt;           /* Packet counter               */
 385         u_int64_t       bcnt;           /* Byte counter                 */
 386         u_int32_t       timestamp;      /* tv_sec of last match         */
 387
 388         u_int32_t       reserved_1;     /* reserved - set to 0 */
 389         u_int32_t       reserved_2;     /* reserved - set to 0 */
 390
 391         ipfw_insn       cmd[1];         /* storage for commands         */
 392 };
 393
 394 #define ACTION_PTR(rule)                                \
 395         (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
 396
 397 #define RULESIZE(rule)  (sizeof(struct ip_fw) + \
 398         ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
 399
 400 /*
 401  * This structure is used as a flow mask and a flow id for various
 402  * parts of the code.
 403  */
 404 struct ipfw_flow_id {
 405         u_int32_t       dst_ip;
 406         u_int32_t       src_ip;
 407         u_int16_t       dst_port;
 408         u_int16_t       src_port;
 409         u_int8_t        proto;
 410         u_int8_t        flags;  /* protocol-specific flags */
 411 };
 412
 413 /*
 414  * Dynamic ipfw rule.
 415  */
 416 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
 417
 418 #ifdef XNU_KERNEL_PRIVATE
 419
 420 #include <netinet/ip_flowid.h>
 421
 422 /*
 423  * Note:
 424  * The internal version of "struct _ipfw_dyn_rule" differs from
 425  * its external version because the field "id" is of type
 426  * "struct ip_flow_id" in the internal version. The type of the
 427  * field "id" for the external version is "ipfw_dyn_rule for
 428  * backwards compatibility reasons.
 429  */
 430
 431 struct _ipfw_dyn_rule {
 432         ipfw_dyn_rule   *next;          /* linked list of rules.        */
 433         struct ip_fw *rule;             /* pointer to rule              */
 434         /* 'rule' is used to pass up the rule number (from the parent)  */
 435
 436         ipfw_dyn_rule *parent;          /* pointer to parent rule       */
 437         u_int64_t       pcnt;           /* packet match counter         */
 438         u_int64_t       bcnt;           /* byte match counter           */
 439         struct ip_flow_id id;           /* (masked) flow id             */
 440         u_int32_t       expire;         /* expire time                  */
 441         u_int32_t       bucket;         /* which bucket in hash table   */
 442         u_int32_t       state;          /* state of this rule (typically a
 443                                          * combination of TCP flags)
 444                                          */
 445         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
 446         u_int32_t       ack_rev;        /* and reverse directions (used */
 447                                         /* to generate keepalives)      */
 448         u_int16_t       dyn_type;       /* rule type                    */
 449         u_int16_t       count;          /* refcount                     */
 450 };
 451 #else /* XNU_KERNEL_PRIVATE */
 452 struct _ipfw_dyn_rule {
 453         ipfw_dyn_rule   *next;          /* linked list of rules.        */
 454         struct ip_fw *rule;             /* pointer to rule              */
 455         /* 'rule' is used to pass up the rule number (from the parent)  */
 456
 457         ipfw_dyn_rule *parent;          /* pointer to parent rule       */
 458         u_int64_t       pcnt;           /* packet match counter         */
 459         u_int64_t       bcnt;           /* byte match counter           */
 460         struct ipfw_flow_id id;         /* (masked) flow id             */
 461         u_int32_t       expire;         /* expire time                  */
 462         u_int32_t       bucket;         /* which bucket in hash table   */
 463         u_int32_t       state;          /* state of this rule (typically a
 464                                          * combination of TCP flags)
 465                                          */
 466         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
 467         u_int32_t       ack_rev;        /* and reverse directions (used */
 468                                         /* to generate keepalives)      */
 469         u_int16_t       dyn_type;       /* rule type                    */
 470         u_int16_t       count;          /* refcount                     */
 471 };
 472 #endif /* XNU_KERNEL_PRIVATE */
 473
 474 /*
 475  * Definitions for IP option names.
 476  */
 477 #define IP_FW_IPOPT_LSRR        0x01
 478 #define IP_FW_IPOPT_SSRR        0x02
 479 #define IP_FW_IPOPT_RR          0x04
 480 #define IP_FW_IPOPT_TS          0x08
 481
 482 /*
 483  * Definitions for TCP option names.
 484  */
 485 #define IP_FW_TCPOPT_MSS        0x01
 486 #define IP_FW_TCPOPT_WINDOW     0x02
 487 #define IP_FW_TCPOPT_SACK       0x04
 488 #define IP_FW_TCPOPT_TS         0x08
 489 #define IP_FW_TCPOPT_CC         0x10
 490
 491 #define ICMP_REJECT_RST         0x100   /* fake ICMP code (send a TCP RST) */
 492
 493 /*
 494  * Main firewall chains definitions and global var's definitions.
 495  */
 496 #ifdef BSD_KERNEL_PRIVATE
 497
 498 #pragma pack(4)
 499 struct ip_fw_32{
 500         u_int32_t version;              /* Version of this structure. MUST be set */
 501                                                                                 /* by clients. Should always be */
 502                                                                                 /* set to IP_FW_CURRENT_API_VERSION. */
 503                 user32_addr_t   context;                /* Context that is usable by user processes to */
 504                                                                                 /* identify this rule. */
 505         user32_addr_t   next;                   /* linked list of rules         */
 506         user32_addr_t   next_rule;/* ptr to next [skipto] rule    */
 507                                                                                 /* 'next_rule' is used to pass up 'set_disable' status          */
 508
 509         u_int16_t       act_ofs;                /* offset of action in 32-bit units */
 510         u_int16_t       cmd_len;        /* # of 32-bit words in cmd     */
 511         u_int16_t       rulenum;        /* rule number                  */
 512         u_int8_t        set;            /* rule set (0..31)             */
 513         u_int32_t       set_masks[2];   /* masks for manipulating sets atomically */
 514 #define RESVD_SET       31      /* set for default and persistent rules */
 515         u_int8_t        _pad;           /* padding                      */
 516
 517         /* These fields are present in all rules.                       */
 518         u_int64_t       pcnt;           /* Packet counter               */
 519         u_int64_t       bcnt;           /* Byte counter                 */
 520         u_int32_t       timestamp;      /* tv_sec of last match         */
 521
 522         u_int32_t       reserved_1;     /* reserved - set to 0 */
 523         u_int32_t       reserved_2;     /* reserved - set to 0 */
 524
 525         ipfw_insn       cmd[1];         /* storage for commands         */
 526 };
 527
 528 #pragma pack()
 529
 530 struct ip_fw_64{
 531         u_int32_t version;              /* Version of this structure. MUST be set */
 532                                                                                 /* by clients. Should always be */
 533                                                                                 /* set to IP_FW_CURRENT_API_VERSION. */
 534                 __uint64_t context __attribute__((aligned(8))); /* Context that is usable by user processes to */
 535                                                         /* identify this rule. */
 536         user64_addr_t   next;          /* linked list of rules         */
 537         user64_addr_t   next_rule;     /* ptr to next [skipto] rule    */
 538         /* 'next_rule' is used to pass up 'set_disable' status          */
 539
 540         u_int16_t       act_ofs;        /* offset of action in 32-bit units */
 541         u_int16_t       cmd_len;        /* # of 32-bit words in cmd     */
 542         u_int16_t       rulenum;        /* rule number                  */
 543         u_int8_t        set;            /* rule set (0..31)             */
 544         u_int32_t       set_masks[2];   /* masks for manipulating sets atomically */
 545 #define RESVD_SET       31      /* set for default and persistent rules */
 546         u_int8_t        _pad;           /* padding                      */
 547
 548         /* These fields are present in all rules.                       */
 549         u_int64_t       pcnt __attribute__((aligned(8)));       /* Packet counter               */
 550         u_int64_t       bcnt __attribute__((aligned(8)));      /* Byte counter                 */
 551         u_int32_t       timestamp;      /* tv_sec of last match         */
 552
 553         u_int32_t       reserved_1;     /* reserved - set to 0 */
 554         u_int32_t       reserved_2;     /* reserved - set to 0 */
 555
 556         ipfw_insn       cmd[1];         /* storage for commands         */
 557 };
 558
 559
 560 typedef struct _ipfw_dyn_rule_64 ipfw_dyn_rule_64;
 561 typedef struct _ipfw_dyn_rule_32 ipfw_dyn_rule_32;
 562
 563 #pragma pack(4)
 564 struct _ipfw_dyn_rule_32 {
 565         user32_addr_t   next;                   /* linked list of rules.        */
 566         user32_addr_t   rule;                   /* pointer to rule              */
 567         /* 'rule' is used to pass up the rule number (from the parent)  */
 568
 569         user32_addr_t   parent;          /* pointer to parent rule       */
 570         u_int64_t       pcnt;           /* packet match counter         */
 571         u_int64_t       bcnt;           /* byte match counter           */
 572         struct ipfw_flow_id id;         /* (masked) flow id             */
 573         u_int32_t       expire;         /* expire time                  */
 574         u_int32_t       bucket;         /* which bucket in hash table   */
 575         u_int32_t       state;          /* state of this rule (typically a
 576                                          * combination of TCP flags)
 577                                          */
 578         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
 579         u_int32_t       ack_rev;        /* and reverse directions (used */
 580                                         /* to generate keepalives)      */
 581         u_int16_t       dyn_type;       /* rule type                    */
 582         u_int16_t       count;          /* refcount                     */
 583 };
 584
 585 #pragma pack()
 586
 587 struct _ipfw_dyn_rule_64 {
 588         user64_addr_t   next;          /* linked list of rules.        */
 589         user64_addr_t   rule;             /* pointer to rule              */
 590         /* 'rule' is used to pass up the rule number (from the parent)  */
 591
 592         user64_addr_t   parent;          /* pointer to parent rule       */
 593         u_int64_t       pcnt;           /* packet match counter         */
 594         u_int64_t       bcnt;           /* byte match counter           */
 595         struct ipfw_flow_id id;         /* (masked) flow id             */
 596         u_int32_t       expire;         /* expire time                  */
 597         u_int32_t       bucket;         /* which bucket in hash table   */
 598         u_int32_t       state;          /* state of this rule (typically a
 599                                          * combination of TCP flags)
 600                                          */
 601         u_int32_t       ack_fwd;        /* most recent ACKs in forward  */
 602         u_int32_t       ack_rev;        /* and reverse directions (used */
 603                                         /* to generate keepalives)      */
 604         u_int16_t       dyn_type;       /* rule type                    */
 605         u_int16_t       count;          /* refcount                     */
 606 };
 607
 608
 609 typedef struct  _ipfw_insn_pipe_64 {
 610         ipfw_insn       o;
 611         user64_addr_t   pipe_ptr;      /* XXX */
 612 } ipfw_insn_pipe_64;
 613
 614 typedef struct  _ipfw_insn_pipe_32{
 615         ipfw_insn       o;
 616         user32_addr_t   pipe_ptr;      /* XXX */
 617 } ipfw_insn_pipe_32;
 618
 619
 620 #define IPFW_DEFAULT_RULE       65535
 621
 622 #if IPFIREWALL
 623
 624 #define IP_FW_PORT_DYNT_FLAG    0x10000
 625 #define IP_FW_PORT_TEE_FLAG     0x20000
 626 #define IP_FW_PORT_DENY_FLAG    0x40000
 627
 628 #ifdef PRIVATE
 629 #include <netinet/ip_flowid.h>
 630 #else
 631 struct ip_fw_args;
 632 #endif
 633 /*
 634  * Function definitions.
 635  */
 636
 637 /* Firewall hooks */
 638 struct sockopt;
 639 struct dn_flow_set;
 640
 641 void flush_pipe_ptrs(struct dn_flow_set *match); /* used by dummynet */
 642 void ipfw_init(void);   /* called from raw_ip.c: load_ipfw() */
 643
 644 typedef int ip_fw_chk_t (struct ip_fw_args *args);
 645 typedef int ip_fw_ctl_t (struct sockopt *);
 646 extern ip_fw_chk_t *ip_fw_chk_ptr;
 647 extern ip_fw_ctl_t *ip_fw_ctl_ptr;
 648 extern int fw_one_pass;
 649 extern int fw_enable;
 650 #define IPFW_LOADED     (ip_fw_chk_ptr != NULL)
 651 #endif /* IPFIREWALL */
 652 #endif /* BSD_KERNEL_PRIVATE */
 653
 654 #endif /* __APPLE_API_OBSOLETE */
 655 #endif /* _IPFW2_H */