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/9.1/sys/netinet/ip_fw.h 234597 2012-04-23 07:15:15Z 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_LAST_OPCODE /* not an opcode! */ 222 }; 223 224 225 /* 226 * The extension header are filtered only for presence using a bit 227 * vector with a flag for each header. 228 */ 229 #define EXT_FRAGMENT 0x1 230 #define EXT_HOPOPTS 0x2 231 #define EXT_ROUTING 0x4 232 #define EXT_AH 0x8 233 #define EXT_ESP 0x10 234 #define EXT_DSTOPTS 0x20 235 #define EXT_RTHDR0 0x40 236 #define EXT_RTHDR2 0x80 237 238 /* 239 * Template for instructions. 240 * 241 * ipfw_insn is used for all instructions which require no operands, 242 * a single 16-bit value (arg1), or a couple of 8-bit values. 243 * 244 * For other instructions which require different/larger arguments 245 * we have derived structures, ipfw_insn_*. 246 * 247 * The size of the instruction (in 32-bit words) is in the low 248 * 6 bits of "len". The 2 remaining bits are used to implement 249 * NOT and OR on individual instructions. Given a type, you can 250 * compute the length to be put in "len" using F_INSN_SIZE(t) 251 * 252 * F_NOT negates the match result of the instruction. 253 * 254 * F_OR is used to build or blocks. By default, instructions 255 * are evaluated as part of a logical AND. An "or" block 256 * { X or Y or Z } contains F_OR set in all but the last 257 * instruction of the block. A match will cause the code 258 * to skip past the last instruction of the block. 259 * 260 * NOTA BENE: in a couple of places we assume that 261 * sizeof(ipfw_insn) == sizeof(u_int32_t) 262 * this needs to be fixed. 263 * 264 */ 265 typedef struct _ipfw_insn { /* template for instructions */ 266 u_int8_t opcode; 267 u_int8_t len; /* number of 32-bit words */ 268 #define F_NOT 0x80 269 #define F_OR 0x40 270 #define F_LEN_MASK 0x3f 271 #define F_LEN(cmd) ((cmd)->len & F_LEN_MASK) 272 273 u_int16_t arg1; 274 } ipfw_insn; 275 276 /* 277 * The F_INSN_SIZE(type) computes the size, in 4-byte words, of 278 * a given type. 279 */ 280 #define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t)) 281 282 /* 283 * This is used to store an array of 16-bit entries (ports etc.) 284 */ 285 typedef struct _ipfw_insn_u16 { 286 ipfw_insn o; 287 u_int16_t ports[2]; /* there may be more */ 288 } ipfw_insn_u16; 289 290 /* 291 * This is used to store an array of 32-bit entries 292 * (uid, single IPv4 addresses etc.) 293 */ 294 typedef struct _ipfw_insn_u32 { 295 ipfw_insn o; 296 u_int32_t d[1]; /* one or more */ 297 } ipfw_insn_u32; 298 299 /* 300 * This is used to store IP addr-mask pairs. 301 */ 302 typedef struct _ipfw_insn_ip { 303 ipfw_insn o; 304 struct in_addr addr; 305 struct in_addr mask; 306 } ipfw_insn_ip; 307 308 /* 309 * This is used to forward to a given address (ip). 310 */ 311 typedef struct _ipfw_insn_sa { 312 ipfw_insn o; 313 struct sockaddr_in sa; 314 } ipfw_insn_sa; 315 316 /* 317 * This is used to forward to a given address (ipv6). 318 */ 319 typedef struct _ipfw_insn_sa6 { 320 ipfw_insn o; 321 struct sockaddr_in6 sa; 322 } ipfw_insn_sa6; 323 324 /* 325 * This is used for MAC addr-mask pairs. 326 */ 327 typedef struct _ipfw_insn_mac { 328 ipfw_insn o; 329 u_char addr[12]; /* dst[6] + src[6] */ 330 u_char mask[12]; /* dst[6] + src[6] */ 331 } ipfw_insn_mac; 332 333 /* 334 * This is used for interface match rules (recv xx, xmit xx). 335 */ 336 typedef struct _ipfw_insn_if { 337 ipfw_insn o; 338 union { 339 struct in_addr ip; 340 int glob; 341 } p; 342 char name[IFNAMSIZ]; 343 } ipfw_insn_if; 344 345 /* 346 * This is used for storing an altq queue id number. 347 */ 348 typedef struct _ipfw_insn_altq { 349 ipfw_insn o; 350 u_int32_t qid; 351 } ipfw_insn_altq; 352 353 /* 354 * This is used for limit rules. 355 */ 356 typedef struct _ipfw_insn_limit { 357 ipfw_insn o; 358 u_int8_t _pad; 359 u_int8_t limit_mask; /* combination of DYN_* below */ 360 #define DYN_SRC_ADDR 0x1 361 #define DYN_SRC_PORT 0x2 362 #define DYN_DST_ADDR 0x4 363 #define DYN_DST_PORT 0x8 364 365 u_int16_t conn_limit; 366 } ipfw_insn_limit; 367 368 /* 369 * This is used for log instructions. 370 */ 371 typedef struct _ipfw_insn_log { 372 ipfw_insn o; 373 u_int32_t max_log; /* how many do we log -- 0 = all */ 374 u_int32_t log_left; /* how many left to log */ 375 } ipfw_insn_log; 376 377 /* 378 * Data structures required by both ipfw(8) and ipfw(4) but not part of the 379 * management API are protected by IPFW_INTERNAL. 380 */ 381 #ifdef IPFW_INTERNAL 382 /* Server pool support (LSNAT). */ 383 struct cfg_spool { 384 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */ 385 struct in_addr addr; 386 u_short port; 387 }; 388 #endif 389 390 /* Redirect modes id. */ 391 #define REDIR_ADDR 0x01 392 #define REDIR_PORT 0x02 393 #define REDIR_PROTO 0x04 394 395 #ifdef IPFW_INTERNAL 396 /* Nat redirect configuration. */ 397 struct cfg_redir { 398 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */ 399 u_int16_t mode; /* type of redirect mode */ 400 struct in_addr laddr; /* local ip address */ 401 struct in_addr paddr; /* public ip address */ 402 struct in_addr raddr; /* remote ip address */ 403 u_short lport; /* local port */ 404 u_short pport; /* public port */ 405 u_short rport; /* remote port */ 406 u_short pport_cnt; /* number of public ports */ 407 u_short rport_cnt; /* number of remote ports */ 408 int proto; /* protocol: tcp/udp */ 409 struct alias_link **alink; 410 /* num of entry in spool chain */ 411 u_int16_t spool_cnt; 412 /* chain of spool instances */ 413 LIST_HEAD(spool_chain, cfg_spool) spool_chain; 414 }; 415 #endif 416 417 #ifdef IPFW_INTERNAL 418 /* Nat configuration data struct. */ 419 struct cfg_nat { 420 /* chain of nat instances */ 421 LIST_ENTRY(cfg_nat) _next; 422 int id; /* nat id */ 423 struct in_addr ip; /* nat ip address */ 424 char if_name[IF_NAMESIZE]; /* interface name */ 425 int mode; /* aliasing mode */ 426 struct libalias *lib; /* libalias instance */ 427 /* number of entry in spool chain */ 428 int redir_cnt; 429 /* chain of redir instances */ 430 LIST_HEAD(redir_chain, cfg_redir) redir_chain; 431 }; 432 #endif 433 434 #define SOF_NAT sizeof(struct cfg_nat) 435 #define SOF_REDIR sizeof(struct cfg_redir) 436 #define SOF_SPOOL sizeof(struct cfg_spool) 437 438 /* Nat command. */ 439 typedef struct _ipfw_insn_nat { 440 ipfw_insn o; 441 struct cfg_nat *nat; 442 } ipfw_insn_nat; 443 444 /* Apply ipv6 mask on ipv6 addr */ 445 #define APPLY_MASK(addr,mask) \ 446 (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \ 447 (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \ 448 (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \ 449 (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3]; 450 451 /* Structure for ipv6 */ 452 typedef struct _ipfw_insn_ip6 { 453 ipfw_insn o; 454 struct in6_addr addr6; 455 struct in6_addr mask6; 456 } ipfw_insn_ip6; 457 458 /* Used to support icmp6 types */ 459 typedef struct _ipfw_insn_icmp6 { 460 ipfw_insn o; 461 uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h 462 * define ICMP6_MAXTYPE 463 * as follows: n = ICMP6_MAXTYPE/32 + 1 464 * Actually is 203 465 */ 466 } ipfw_insn_icmp6; 467 468 /* 469 * Here we have the structure representing an ipfw rule. 470 * 471 * It starts with a general area (with link fields and counters) 472 * followed by an array of one or more instructions, which the code 473 * accesses as an array of 32-bit values. 474 * 475 * Given a rule pointer r: 476 * 477 * r->cmd is the start of the first instruction. 478 * ACTION_PTR(r) is the start of the first action (things to do 479 * once a rule matched). 480 * 481 * When assembling instruction, remember the following: 482 * 483 * + if a rule has a "keep-state" (or "limit") option, then the 484 * first instruction (at r->cmd) MUST BE an O_PROBE_STATE 485 * + if a rule has a "log" option, then the first action 486 * (at ACTION_PTR(r)) MUST be O_LOG 487 * + if a rule has an "altq" option, it comes after "log" 488 * + if a rule has an O_TAG option, it comes after "log" and "altq" 489 * 490 * NOTE: we use a simple linked list of rules because we never need 491 * to delete a rule without scanning the list. We do not use 492 * queue(3) macros for portability and readability. 493 */ 494 495 struct ip_fw { 496 struct ip_fw *x_next; /* linked list of rules */ 497 struct ip_fw *next_rule; /* ptr to next [skipto] rule */ 498 /* 'next_rule' is used to pass up 'set_disable' status */ 499 500 uint16_t act_ofs; /* offset of action in 32-bit units */ 501 uint16_t cmd_len; /* # of 32-bit words in cmd */ 502 uint16_t rulenum; /* rule number */ 503 uint8_t set; /* rule set (0..31) */ 504 #define RESVD_SET 31 /* set for default and persistent rules */ 505 uint8_t _pad; /* padding */ 506 uint32_t id; /* rule id */ 507 508 /* These fields are present in all rules. */ 509 uint64_t pcnt; /* Packet counter */ 510 uint64_t bcnt; /* Byte counter */ 511 uint32_t timestamp; /* tv_sec of last match */ 512 513 ipfw_insn cmd[1]; /* storage for commands */ 514 }; 515 516 #define ACTION_PTR(rule) \ 517 (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) ) 518 519 #define RULESIZE(rule) (sizeof(struct ip_fw) + \ 520 ((struct ip_fw *)(rule))->cmd_len * 4 - 4) 521 522 #if 1 // should be moved to in.h 523 /* 524 * This structure is used as a flow mask and a flow id for various 525 * parts of the code. 526 * addr_type is used in userland and kernel to mark the address type. 527 * fib is used in the kernel to record the fib in use. 528 * _flags is used in the kernel to store tcp flags for dynamic rules. 529 */ 530 struct ipfw_flow_id { 531 uint32_t dst_ip; 532 uint32_t src_ip; 533 uint16_t dst_port; 534 uint16_t src_port; 535 uint8_t fib; 536 uint8_t proto; 537 uint8_t _flags; /* protocol-specific flags */ 538 uint8_t addr_type; /* 4=ip4, 6=ip6, 1=ether ? */ 539 struct in6_addr dst_ip6; 540 struct in6_addr src_ip6; 541 uint32_t flow_id6; 542 uint32_t extra; /* queue/pipe or frag_id */ 543 }; 544 #endif 545 546 #define IS_IP6_FLOW_ID(id) ((id)->addr_type == 6) 547 548 /* 549 * Dynamic ipfw rule. 550 */ 551 typedef struct _ipfw_dyn_rule ipfw_dyn_rule; 552 553 struct _ipfw_dyn_rule { 554 ipfw_dyn_rule *next; /* linked list of rules. */ 555 struct ip_fw *rule; /* pointer to rule */ 556 /* 'rule' is used to pass up the rule number (from the parent) */ 557 558 ipfw_dyn_rule *parent; /* pointer to parent rule */ 559 u_int64_t pcnt; /* packet match counter */ 560 u_int64_t bcnt; /* byte match counter */ 561 struct ipfw_flow_id id; /* (masked) flow id */ 562 u_int32_t expire; /* expire time */ 563 u_int32_t bucket; /* which bucket in hash table */ 564 u_int32_t state; /* state of this rule (typically a 565 * combination of TCP flags) 566 */ 567 u_int32_t ack_fwd; /* most recent ACKs in forward */ 568 u_int32_t ack_rev; /* and reverse directions (used */ 569 /* to generate keepalives) */ 570 u_int16_t dyn_type; /* rule type */ 571 u_int16_t count; /* refcount */ 572 }; 573 574 /* 575 * Definitions for IP option names. 576 */ 577 #define IP_FW_IPOPT_LSRR 0x01 578 #define IP_FW_IPOPT_SSRR 0x02 579 #define IP_FW_IPOPT_RR 0x04 580 #define IP_FW_IPOPT_TS 0x08 581 582 /* 583 * Definitions for TCP option names. 584 */ 585 #define IP_FW_TCPOPT_MSS 0x01 586 #define IP_FW_TCPOPT_WINDOW 0x02 587 #define IP_FW_TCPOPT_SACK 0x04 588 #define IP_FW_TCPOPT_TS 0x08 589 #define IP_FW_TCPOPT_CC 0x10 590 591 #define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */ 592 #define ICMP6_UNREACH_RST 0x100 /* fake ICMPv6 code (send a TCP RST) */ 593 594 /* 595 * These are used for lookup tables. 596 */ 597 598 #define IPFW_TABLE_CIDR 1 /* Table for holding IPv4/IPv6 prefixes */ 599 #define IPFW_TABLE_INTERFACE 2 /* Table for holding interface names */ 600 #define IPFW_TABLE_MAXTYPE 2 /* Maximum valid number */ 601 602 typedef struct _ipfw_table_entry { 603 in_addr_t addr; /* network address */ 604 u_int32_t value; /* value */ 605 u_int16_t tbl; /* table number */ 606 u_int8_t masklen; /* mask length */ 607 } ipfw_table_entry; 608 609 typedef struct _ipfw_table_xentry { 610 uint16_t len; /* Total entry length */ 611 uint8_t type; /* entry type */ 612 uint8_t masklen; /* mask length */ 613 uint16_t tbl; /* table number */ 614 uint32_t value; /* value */ 615 union { 616 /* Longest field needs to be aligned by 4-byte boundary */ 617 struct in6_addr addr6; /* IPv6 address */ 618 char iface[IF_NAMESIZE]; /* interface name */ 619 } k; 620 } ipfw_table_xentry; 621 622 typedef struct _ipfw_table { 623 u_int32_t size; /* size of entries in bytes */ 624 u_int32_t cnt; /* # of entries */ 625 u_int16_t tbl; /* table number */ 626 ipfw_table_entry ent[0]; /* entries */ 627 } ipfw_table; 628 629 typedef struct _ipfw_xtable { 630 ip_fw3_opheader opheader; /* eXtended tables are controlled via IP_FW3 */ 631 uint32_t size; /* size of entries in bytes */ 632 uint32_t cnt; /* # of entries */ 633 uint16_t tbl; /* table number */ 634 uint8_t type; /* table type */ 635 ipfw_table_xentry xent[0]; /* entries */ 636 } ipfw_xtable; 637 638 #endif /* _IPFW2_H */
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