| 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 | ␊ |
| 461 | ␊ |
| 462 | #endif /* _IPFW2_H */␊ |
| 463 | |
