Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_fw.h
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1 /*- 2 * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: releng/10.2/sys/netinet/ip_fw.h 248552 2013-03-20 10:35:33Z melifaro $ 26 */ 27 28 #ifndef _IPFW2_H 29 #define _IPFW2_H 30 31 /* 32 * The default rule number. By the design of ip_fw, the default rule 33 * is the last one, so its number can also serve as the highest number 34 * allowed for a rule. The ip_fw code relies on both meanings of this 35 * constant. 36 */ 37 #define IPFW_DEFAULT_RULE 65535 38 39 /* 40 * Default number of ipfw tables. 41 */ 42 #define IPFW_TABLES_MAX 65535 43 #define IPFW_TABLES_DEFAULT 128 44 45 /* 46 * Most commands (queue, pipe, tag, untag, limit...) can have a 16-bit 47 * argument between 1 and 65534. The value 0 is unused, the value 48 * 65535 (IP_FW_TABLEARG) is used to represent 'tablearg', i.e. the 49 * can be 1..65534, or 65535 to indicate the use of a 'tablearg' 50 * result of the most recent table() lookup. 51 * Note that 16bit is only a historical limit, resulting from 52 * the use of a 16-bit fields for that value. In reality, we can have 53 * 2^32 pipes, queues, tag values and so on, and use 0 as a tablearg. 54 */ 55 #define IPFW_ARG_MIN 1 56 #define IPFW_ARG_MAX 65534 57 #define IP_FW_TABLEARG 65535 /* XXX should use 0 */ 58 59 /* 60 * Number of entries in the call stack of the call/return commands. 61 * Call stack currently is an uint16_t array with rule numbers. 62 */ 63 #define IPFW_CALLSTACK_SIZE 16 64 65 /* IP_FW3 header/opcodes */ 66 typedef struct _ip_fw3_opheader { 67 uint16_t opcode; /* Operation opcode */ 68 uint16_t reserved[3]; /* Align to 64-bit boundary */ 69 } ip_fw3_opheader; 70 71 72 /* IPFW extented tables support */ 73 #define IP_FW_TABLE_XADD 86 /* add entry */ 74 #define IP_FW_TABLE_XDEL 87 /* delete entry */ 75 #define IP_FW_TABLE_XGETSIZE 88 /* get table size */ 76 #define IP_FW_TABLE_XLIST 89 /* list table contents */ 77 78 /* 79 * The kernel representation of ipfw rules is made of a list of 80 * 'instructions' (for all practical purposes equivalent to BPF 81 * instructions), which specify which fields of the packet 82 * (or its metadata) should be analysed. 83 * 84 * Each instruction is stored in a structure which begins with 85 * "ipfw_insn", and can contain extra fields depending on the 86 * instruction type (listed below). 87 * Note that the code is written so that individual instructions 88 * have a size which is a multiple of 32 bits. This means that, if 89 * such structures contain pointers or other 64-bit entities, 90 * (there is just one instance now) they may end up unaligned on 91 * 64-bit architectures, so the must be handled with care. 92 * 93 * "enum ipfw_opcodes" are the opcodes supported. We can have up 94 * to 256 different opcodes. When adding new opcodes, they should 95 * be appended to the end of the opcode list before O_LAST_OPCODE, 96 * this will prevent the ABI from being broken, otherwise users 97 * will have to recompile ipfw(8) when they update the kernel. 98 */ 99 100 enum ipfw_opcodes { /* arguments (4 byte each) */ 101 O_NOP, 102 103 O_IP_SRC, /* u32 = IP */ 104 O_IP_SRC_MASK, /* ip = IP/mask */ 105 O_IP_SRC_ME, /* none */ 106 O_IP_SRC_SET, /* u32=base, arg1=len, bitmap */ 107 108 O_IP_DST, /* u32 = IP */ 109 O_IP_DST_MASK, /* ip = IP/mask */ 110 O_IP_DST_ME, /* none */ 111 O_IP_DST_SET, /* u32=base, arg1=len, bitmap */ 112 113 O_IP_SRCPORT, /* (n)port list:mask 4 byte ea */ 114 O_IP_DSTPORT, /* (n)port list:mask 4 byte ea */ 115 O_PROTO, /* arg1=protocol */ 116 117 O_MACADDR2, /* 2 mac addr:mask */ 118 O_MAC_TYPE, /* same as srcport */ 119 120 O_LAYER2, /* none */ 121 O_IN, /* none */ 122 O_FRAG, /* none */ 123 124 O_RECV, /* none */ 125 O_XMIT, /* none */ 126 O_VIA, /* none */ 127 128 O_IPOPT, /* arg1 = 2*u8 bitmap */ 129 O_IPLEN, /* arg1 = len */ 130 O_IPID, /* arg1 = id */ 131 132 O_IPTOS, /* arg1 = id */ 133 O_IPPRECEDENCE, /* arg1 = precedence << 5 */ 134 O_IPTTL, /* arg1 = TTL */ 135 136 O_IPVER, /* arg1 = version */ 137 O_UID, /* u32 = id */ 138 O_GID, /* u32 = id */ 139 O_ESTAB, /* none (tcp established) */ 140 O_TCPFLAGS, /* arg1 = 2*u8 bitmap */ 141 O_TCPWIN, /* arg1 = desired win */ 142 O_TCPSEQ, /* u32 = desired seq. */ 143 O_TCPACK, /* u32 = desired seq. */ 144 O_ICMPTYPE, /* u32 = icmp bitmap */ 145 O_TCPOPTS, /* arg1 = 2*u8 bitmap */ 146 147 O_VERREVPATH, /* none */ 148 O_VERSRCREACH, /* none */ 149 150 O_PROBE_STATE, /* none */ 151 O_KEEP_STATE, /* none */ 152 O_LIMIT, /* ipfw_insn_limit */ 153 O_LIMIT_PARENT, /* dyn_type, not an opcode. */ 154 155 /* 156 * These are really 'actions'. 157 */ 158 159 O_LOG, /* ipfw_insn_log */ 160 O_PROB, /* u32 = match probability */ 161 162 O_CHECK_STATE, /* none */ 163 O_ACCEPT, /* none */ 164 O_DENY, /* none */ 165 O_REJECT, /* arg1=icmp arg (same as deny) */ 166 O_COUNT, /* none */ 167 O_SKIPTO, /* arg1=next rule number */ 168 O_PIPE, /* arg1=pipe number */ 169 O_QUEUE, /* arg1=queue number */ 170 O_DIVERT, /* arg1=port number */ 171 O_TEE, /* arg1=port number */ 172 O_FORWARD_IP, /* fwd sockaddr */ 173 O_FORWARD_MAC, /* fwd mac */ 174 O_NAT, /* nope */ 175 O_REASS, /* none */ 176 177 /* 178 * More opcodes. 179 */ 180 O_IPSEC, /* has ipsec history */ 181 O_IP_SRC_LOOKUP, /* arg1=table number, u32=value */ 182 O_IP_DST_LOOKUP, /* arg1=table number, u32=value */ 183 O_ANTISPOOF, /* none */ 184 O_JAIL, /* u32 = id */ 185 O_ALTQ, /* u32 = altq classif. qid */ 186 O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */ 187 O_TCPDATALEN, /* arg1 = tcp data len */ 188 O_IP6_SRC, /* address without mask */ 189 O_IP6_SRC_ME, /* my addresses */ 190 O_IP6_SRC_MASK, /* address with the mask */ 191 O_IP6_DST, 192 O_IP6_DST_ME, 193 O_IP6_DST_MASK, 194 O_FLOW6ID, /* for flow id tag in the ipv6 pkt */ 195 O_ICMP6TYPE, /* icmp6 packet type filtering */ 196 O_EXT_HDR, /* filtering for ipv6 extension header */ 197 O_IP6, 198 199 /* 200 * actions for ng_ipfw 201 */ 202 O_NETGRAPH, /* send to ng_ipfw */ 203 O_NGTEE, /* copy to ng_ipfw */ 204 205 O_IP4, 206 207 O_UNREACH6, /* arg1=icmpv6 code arg (deny) */ 208 209 O_TAG, /* arg1=tag number */ 210 O_TAGGED, /* arg1=tag number */ 211 212 O_SETFIB, /* arg1=FIB number */ 213 O_FIB, /* arg1=FIB desired fib number */ 214 215 O_SOCKARG, /* socket argument */ 216 217 O_CALLRETURN, /* arg1=called rule number */ 218 219 O_FORWARD_IP6, /* fwd sockaddr_in6 */ 220 221 O_DSCP, /* 2 u32 = DSCP mask */ 222 O_SETDSCP, /* arg1=DSCP value */ 223 224 O_LAST_OPCODE /* not an opcode! */ 225 }; 226 227 228 /* 229 * The extension header are filtered only for presence using a bit 230 * vector with a flag for each header. 231 */ 232 #define EXT_FRAGMENT 0x1 233 #define EXT_HOPOPTS 0x2 234 #define EXT_ROUTING 0x4 235 #define EXT_AH 0x8 236 #define EXT_ESP 0x10 237 #define EXT_DSTOPTS 0x20 238 #define EXT_RTHDR0 0x40 239 #define EXT_RTHDR2 0x80 240 241 /* 242 * Template for instructions. 243 * 244 * ipfw_insn is used for all instructions which require no operands, 245 * a single 16-bit value (arg1), or a couple of 8-bit values. 246 * 247 * For other instructions which require different/larger arguments 248 * we have derived structures, ipfw_insn_*. 249 * 250 * The size of the instruction (in 32-bit words) is in the low 251 * 6 bits of "len". The 2 remaining bits are used to implement 252 * NOT and OR on individual instructions. Given a type, you can 253 * compute the length to be put in "len" using F_INSN_SIZE(t) 254 * 255 * F_NOT negates the match result of the instruction. 256 * 257 * F_OR is used to build or blocks. By default, instructions 258 * are evaluated as part of a logical AND. An "or" block 259 * { X or Y or Z } contains F_OR set in all but the last 260 * instruction of the block. A match will cause the code 261 * to skip past the last instruction of the block. 262 * 263 * NOTA BENE: in a couple of places we assume that 264 * sizeof(ipfw_insn) == sizeof(u_int32_t) 265 * this needs to be fixed. 266 * 267 */ 268 typedef struct _ipfw_insn { /* template for instructions */ 269 u_int8_t opcode; 270 u_int8_t len; /* number of 32-bit words */ 271 #define F_NOT 0x80 272 #define F_OR 0x40 273 #define F_LEN_MASK 0x3f 274 #define F_LEN(cmd) ((cmd)->len & F_LEN_MASK) 275 276 u_int16_t arg1; 277 } ipfw_insn; 278 279 /* 280 * The F_INSN_SIZE(type) computes the size, in 4-byte words, of 281 * a given type. 282 */ 283 #define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t)) 284 285 /* 286 * This is used to store an array of 16-bit entries (ports etc.) 287 */ 288 typedef struct _ipfw_insn_u16 { 289 ipfw_insn o; 290 u_int16_t ports[2]; /* there may be more */ 291 } ipfw_insn_u16; 292 293 /* 294 * This is used to store an array of 32-bit entries 295 * (uid, single IPv4 addresses etc.) 296 */ 297 typedef struct _ipfw_insn_u32 { 298 ipfw_insn o; 299 u_int32_t d[1]; /* one or more */ 300 } ipfw_insn_u32; 301 302 /* 303 * This is used to store IP addr-mask pairs. 304 */ 305 typedef struct _ipfw_insn_ip { 306 ipfw_insn o; 307 struct in_addr addr; 308 struct in_addr mask; 309 } ipfw_insn_ip; 310 311 /* 312 * This is used to forward to a given address (ip). 313 */ 314 typedef struct _ipfw_insn_sa { 315 ipfw_insn o; 316 struct sockaddr_in sa; 317 } ipfw_insn_sa; 318 319 /* 320 * This is used to forward to a given address (ipv6). 321 */ 322 typedef struct _ipfw_insn_sa6 { 323 ipfw_insn o; 324 struct sockaddr_in6 sa; 325 } ipfw_insn_sa6; 326 327 /* 328 * This is used for MAC addr-mask pairs. 329 */ 330 typedef struct _ipfw_insn_mac { 331 ipfw_insn o; 332 u_char addr[12]; /* dst[6] + src[6] */ 333 u_char mask[12]; /* dst[6] + src[6] */ 334 } ipfw_insn_mac; 335 336 /* 337 * This is used for interface match rules (recv xx, xmit xx). 338 */ 339 typedef struct _ipfw_insn_if { 340 ipfw_insn o; 341 union { 342 struct in_addr ip; 343 int glob; 344 } p; 345 char name[IFNAMSIZ]; 346 } ipfw_insn_if; 347 348 /* 349 * This is used for storing an altq queue id number. 350 */ 351 typedef struct _ipfw_insn_altq { 352 ipfw_insn o; 353 u_int32_t qid; 354 } ipfw_insn_altq; 355 356 /* 357 * This is used for limit rules. 358 */ 359 typedef struct _ipfw_insn_limit { 360 ipfw_insn o; 361 u_int8_t _pad; 362 u_int8_t limit_mask; /* combination of DYN_* below */ 363 #define DYN_SRC_ADDR 0x1 364 #define DYN_SRC_PORT 0x2 365 #define DYN_DST_ADDR 0x4 366 #define DYN_DST_PORT 0x8 367 368 u_int16_t conn_limit; 369 } ipfw_insn_limit; 370 371 /* 372 * This is used for log instructions. 373 */ 374 typedef struct _ipfw_insn_log { 375 ipfw_insn o; 376 u_int32_t max_log; /* how many do we log -- 0 = all */ 377 u_int32_t log_left; /* how many left to log */ 378 } ipfw_insn_log; 379 380 /* 381 * Data structures required by both ipfw(8) and ipfw(4) but not part of the 382 * management API are protected by IPFW_INTERNAL. 383 */ 384 #ifdef IPFW_INTERNAL 385 /* Server pool support (LSNAT). */ 386 struct cfg_spool { 387 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */ 388 struct in_addr addr; 389 u_short port; 390 }; 391 #endif 392 393 /* Redirect modes id. */ 394 #define REDIR_ADDR 0x01 395 #define REDIR_PORT 0x02 396 #define REDIR_PROTO 0x04 397 398 #ifdef IPFW_INTERNAL 399 /* Nat redirect configuration. */ 400 struct cfg_redir { 401 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */ 402 u_int16_t mode; /* type of redirect mode */ 403 struct in_addr laddr; /* local ip address */ 404 struct in_addr paddr; /* public ip address */ 405 struct in_addr raddr; /* remote ip address */ 406 u_short lport; /* local port */ 407 u_short pport; /* public port */ 408 u_short rport; /* remote port */ 409 u_short pport_cnt; /* number of public ports */ 410 u_short rport_cnt; /* number of remote ports */ 411 int proto; /* protocol: tcp/udp */ 412 struct alias_link **alink; 413 /* num of entry in spool chain */ 414 u_int16_t spool_cnt; 415 /* chain of spool instances */ 416 LIST_HEAD(spool_chain, cfg_spool) spool_chain; 417 }; 418 #endif 419 420 #ifdef IPFW_INTERNAL 421 /* Nat configuration data struct. */ 422 struct cfg_nat { 423 /* chain of nat instances */ 424 LIST_ENTRY(cfg_nat) _next; 425 int id; /* nat id */ 426 struct in_addr ip; /* nat ip address */ 427 char if_name[IF_NAMESIZE]; /* interface name */ 428 int mode; /* aliasing mode */ 429 struct libalias *lib; /* libalias instance */ 430 /* number of entry in spool chain */ 431 int redir_cnt; 432 /* chain of redir instances */ 433 LIST_HEAD(redir_chain, cfg_redir) redir_chain; 434 }; 435 #endif 436 437 #define SOF_NAT sizeof(struct cfg_nat) 438 #define SOF_REDIR sizeof(struct cfg_redir) 439 #define SOF_SPOOL sizeof(struct cfg_spool) 440 441 /* Nat command. */ 442 typedef struct _ipfw_insn_nat { 443 ipfw_insn o; 444 struct cfg_nat *nat; 445 } ipfw_insn_nat; 446 447 /* Apply ipv6 mask on ipv6 addr */ 448 #define APPLY_MASK(addr,mask) \ 449 (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \ 450 (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \ 451 (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \ 452 (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3]; 453 454 /* Structure for ipv6 */ 455 typedef struct _ipfw_insn_ip6 { 456 ipfw_insn o; 457 struct in6_addr addr6; 458 struct in6_addr mask6; 459 } ipfw_insn_ip6; 460 461 /* Used to support icmp6 types */ 462 typedef struct _ipfw_insn_icmp6 { 463 ipfw_insn o; 464 uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h 465 * define ICMP6_MAXTYPE 466 * as follows: n = ICMP6_MAXTYPE/32 + 1 467 * Actually is 203 468 */ 469 } ipfw_insn_icmp6; 470 471 /* 472 * Here we have the structure representing an ipfw rule. 473 * 474 * It starts with a general area (with link fields and counters) 475 * followed by an array of one or more instructions, which the code 476 * accesses as an array of 32-bit values. 477 * 478 * Given a rule pointer r: 479 * 480 * r->cmd is the start of the first instruction. 481 * ACTION_PTR(r) is the start of the first action (things to do 482 * once a rule matched). 483 * 484 * When assembling instruction, remember the following: 485 * 486 * + if a rule has a "keep-state" (or "limit") option, then the 487 * first instruction (at r->cmd) MUST BE an O_PROBE_STATE 488 * + if a rule has a "log" option, then the first action 489 * (at ACTION_PTR(r)) MUST be O_LOG 490 * + if a rule has an "altq" option, it comes after "log" 491 * + if a rule has an O_TAG option, it comes after "log" and "altq" 492 * 493 * NOTE: we use a simple linked list of rules because we never need 494 * to delete a rule without scanning the list. We do not use 495 * queue(3) macros for portability and readability. 496 */ 497 498 struct ip_fw { 499 struct ip_fw *x_next; /* linked list of rules */ 500 struct ip_fw *next_rule; /* ptr to next [skipto] rule */ 501 /* 'next_rule' is used to pass up 'set_disable' status */ 502 503 uint16_t act_ofs; /* offset of action in 32-bit units */ 504 uint16_t cmd_len; /* # of 32-bit words in cmd */ 505 uint16_t rulenum; /* rule number */ 506 uint8_t set; /* rule set (0..31) */ 507 #define RESVD_SET 31 /* set for default and persistent rules */ 508 uint8_t _pad; /* padding */ 509 uint32_t id; /* rule id */ 510 511 /* These fields are present in all rules. */ 512 uint64_t pcnt; /* Packet counter */ 513 uint64_t bcnt; /* Byte counter */ 514 uint32_t timestamp; /* tv_sec of last match */ 515 516 ipfw_insn cmd[1]; /* storage for commands */ 517 }; 518 519 #define ACTION_PTR(rule) \ 520 (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) ) 521 522 #define RULESIZE(rule) (sizeof(struct ip_fw) + \ 523 ((struct ip_fw *)(rule))->cmd_len * 4 - 4) 524 525 #if 1 // should be moved to in.h 526 /* 527 * This structure is used as a flow mask and a flow id for various 528 * parts of the code. 529 * addr_type is used in userland and kernel to mark the address type. 530 * fib is used in the kernel to record the fib in use. 531 * _flags is used in the kernel to store tcp flags for dynamic rules. 532 */ 533 struct ipfw_flow_id { 534 uint32_t dst_ip; 535 uint32_t src_ip; 536 uint16_t dst_port; 537 uint16_t src_port; 538 uint8_t fib; 539 uint8_t proto; 540 uint8_t _flags; /* protocol-specific flags */ 541 uint8_t addr_type; /* 4=ip4, 6=ip6, 1=ether ? */ 542 struct in6_addr dst_ip6; 543 struct in6_addr src_ip6; 544 uint32_t flow_id6; 545 uint32_t extra; /* queue/pipe or frag_id */ 546 }; 547 #endif 548 549 #define IS_IP6_FLOW_ID(id) ((id)->addr_type == 6) 550 551 /* 552 * Dynamic ipfw rule. 553 */ 554 typedef struct _ipfw_dyn_rule ipfw_dyn_rule; 555 556 struct _ipfw_dyn_rule { 557 ipfw_dyn_rule *next; /* linked list of rules. */ 558 struct ip_fw *rule; /* pointer to rule */ 559 /* 'rule' is used to pass up the rule number (from the parent) */ 560 561 ipfw_dyn_rule *parent; /* pointer to parent rule */ 562 u_int64_t pcnt; /* packet match counter */ 563 u_int64_t bcnt; /* byte match counter */ 564 struct ipfw_flow_id id; /* (masked) flow id */ 565 u_int32_t expire; /* expire time */ 566 u_int32_t bucket; /* which bucket in hash table */ 567 u_int32_t state; /* state of this rule (typically a 568 * combination of TCP flags) 569 */ 570 u_int32_t ack_fwd; /* most recent ACKs in forward */ 571 u_int32_t ack_rev; /* and reverse directions (used */ 572 /* to generate keepalives) */ 573 u_int16_t dyn_type; /* rule type */ 574 u_int16_t count; /* refcount */ 575 }; 576 577 /* 578 * Definitions for IP option names. 579 */ 580 #define IP_FW_IPOPT_LSRR 0x01 581 #define IP_FW_IPOPT_SSRR 0x02 582 #define IP_FW_IPOPT_RR 0x04 583 #define IP_FW_IPOPT_TS 0x08 584 585 /* 586 * Definitions for TCP option names. 587 */ 588 #define IP_FW_TCPOPT_MSS 0x01 589 #define IP_FW_TCPOPT_WINDOW 0x02 590 #define IP_FW_TCPOPT_SACK 0x04 591 #define IP_FW_TCPOPT_TS 0x08 592 #define IP_FW_TCPOPT_CC 0x10 593 594 #define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */ 595 #define ICMP6_UNREACH_RST 0x100 /* fake ICMPv6 code (send a TCP RST) */ 596 597 /* 598 * These are used for lookup tables. 599 */ 600 601 #define IPFW_TABLE_CIDR 1 /* Table for holding IPv4/IPv6 prefixes */ 602 #define IPFW_TABLE_INTERFACE 2 /* Table for holding interface names */ 603 #define IPFW_TABLE_MAXTYPE 2 /* Maximum valid number */ 604 605 typedef struct _ipfw_table_entry { 606 in_addr_t addr; /* network address */ 607 u_int32_t value; /* value */ 608 u_int16_t tbl; /* table number */ 609 u_int8_t masklen; /* mask length */ 610 } ipfw_table_entry; 611 612 typedef struct _ipfw_table_xentry { 613 uint16_t len; /* Total entry length */ 614 uint8_t type; /* entry type */ 615 uint8_t masklen; /* mask length */ 616 uint16_t tbl; /* table number */ 617 uint32_t value; /* value */ 618 union { 619 /* Longest field needs to be aligned by 4-byte boundary */ 620 struct in6_addr addr6; /* IPv6 address */ 621 char iface[IF_NAMESIZE]; /* interface name */ 622 } k; 623 } ipfw_table_xentry; 624 625 typedef struct _ipfw_table { 626 u_int32_t size; /* size of entries in bytes */ 627 u_int32_t cnt; /* # of entries */ 628 u_int16_t tbl; /* table number */ 629 ipfw_table_entry ent[0]; /* entries */ 630 } ipfw_table; 631 632 typedef struct _ipfw_xtable { 633 ip_fw3_opheader opheader; /* eXtended tables are controlled via IP_FW3 */ 634 uint32_t size; /* size of entries in bytes */ 635 uint32_t cnt; /* # of entries */ 636 uint16_t tbl; /* table number */ 637 uint8_t type; /* table type */ 638 ipfw_table_xentry xent[0]; /* entries */ 639 } ipfw_xtable; 640 641 #endif /* _IPFW2_H */
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