bsd/netinet/ip_fw2.h

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