FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_fw.h
1 /*-
2 * Copyright (c) 2002 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 * $FreeBSD$
26 */
27
28 #ifndef _IPFW2_H
29 #define _IPFW2_H
30
31 /*
32 * The kernel representation of ipfw rules is made of a list of
33 * 'instructions' (for all practical purposes equivalent to BPF
34 * instructions), which specify which fields of the packet
35 * (or its metadata) should be analysed.
36 *
37 * Each instruction is stored in a structure which begins with
38 * "ipfw_insn", and can contain extra fields depending on the
39 * instruction type (listed below).
40 * Note that the code is written so that individual instructions
41 * have a size which is a multiple of 32 bits. This means that, if
42 * such structures contain pointers or other 64-bit entities,
43 * (there is just one instance now) they may end up unaligned on
44 * 64-bit architectures, so the must be handled with care.
45 *
46 * "enum ipfw_opcodes" are the opcodes supported. We can have up
47 * to 256 different opcodes. When adding new opcodes, they should
48 * be appended to the end of the opcode list before O_LAST_OPCODE,
49 * this will prevent the ABI from being broken, otherwise users
50 * will have to recompile ipfw(8) when they update the kernel.
51 */
52
53 enum ipfw_opcodes { /* arguments (4 byte each) */
54 O_NOP,
55
56 O_IP_SRC, /* u32 = IP */
57 O_IP_SRC_MASK, /* ip = IP/mask */
58 O_IP_SRC_ME, /* none */
59 O_IP_SRC_SET, /* u32=base, arg1=len, bitmap */
60
61 O_IP_DST, /* u32 = IP */
62 O_IP_DST_MASK, /* ip = IP/mask */
63 O_IP_DST_ME, /* none */
64 O_IP_DST_SET, /* u32=base, arg1=len, bitmap */
65
66 O_IP_SRCPORT, /* (n)port list:mask 4 byte ea */
67 O_IP_DSTPORT, /* (n)port list:mask 4 byte ea */
68 O_PROTO, /* arg1=protocol */
69
70 O_MACADDR2, /* 2 mac addr:mask */
71 O_MAC_TYPE, /* same as srcport */
72
73 O_LAYER2, /* none */
74 O_IN, /* none */
75 O_FRAG, /* none */
76
77 O_RECV, /* none */
78 O_XMIT, /* none */
79 O_VIA, /* none */
80
81 O_IPOPT, /* arg1 = 2*u8 bitmap */
82 O_IPLEN, /* arg1 = len */
83 O_IPID, /* arg1 = id */
84
85 O_IPTOS, /* arg1 = id */
86 O_IPPRECEDENCE, /* arg1 = precedence << 5 */
87 O_IPTTL, /* arg1 = TTL */
88
89 O_IPVER, /* arg1 = version */
90 O_UID, /* u32 = id */
91 O_GID, /* u32 = id */
92 O_ESTAB, /* none (tcp established) */
93 O_TCPFLAGS, /* arg1 = 2*u8 bitmap */
94 O_TCPWIN, /* arg1 = desired win */
95 O_TCPSEQ, /* u32 = desired seq. */
96 O_TCPACK, /* u32 = desired seq. */
97 O_ICMPTYPE, /* u32 = icmp bitmap */
98 O_TCPOPTS, /* arg1 = 2*u8 bitmap */
99
100 O_VERREVPATH, /* none */
101 O_VERSRCREACH, /* none */
102
103 O_PROBE_STATE, /* none */
104 O_KEEP_STATE, /* none */
105 O_LIMIT, /* ipfw_insn_limit */
106 O_LIMIT_PARENT, /* dyn_type, not an opcode. */
107
108 /*
109 * These are really 'actions'.
110 */
111
112 O_LOG, /* ipfw_insn_log */
113 O_PROB, /* u32 = match probability */
114
115 O_CHECK_STATE, /* none */
116 O_ACCEPT, /* none */
117 O_DENY, /* none */
118 O_REJECT, /* arg1=icmp arg (same as deny) */
119 O_COUNT, /* none */
120 O_SKIPTO, /* arg1=next rule number */
121 O_PIPE, /* arg1=pipe number */
122 O_QUEUE, /* arg1=queue number */
123 O_DIVERT, /* arg1=port number */
124 O_TEE, /* arg1=port number */
125 O_FORWARD_IP, /* fwd sockaddr */
126 O_FORWARD_MAC, /* fwd mac */
127 O_NAT, /* nope */
128
129 /*
130 * More opcodes.
131 */
132 O_IPSEC, /* has ipsec history */
133 O_IP_SRC_LOOKUP, /* arg1=table number, u32=value */
134 O_IP_DST_LOOKUP, /* arg1=table number, u32=value */
135 O_ANTISPOOF, /* none */
136 O_JAIL, /* u32 = id */
137 O_ALTQ, /* u32 = altq classif. qid */
138 O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */
139 O_TCPDATALEN, /* arg1 = tcp data len */
140 O_IP6_SRC, /* address without mask */
141 O_IP6_SRC_ME, /* my addresses */
142 O_IP6_SRC_MASK, /* address with the mask */
143 O_IP6_DST,
144 O_IP6_DST_ME,
145 O_IP6_DST_MASK,
146 O_FLOW6ID, /* for flow id tag in the ipv6 pkt */
147 O_ICMP6TYPE, /* icmp6 packet type filtering */
148 O_EXT_HDR, /* filtering for ipv6 extension header */
149 O_IP6,
150
151 /*
152 * actions for ng_ipfw
153 */
154 O_NETGRAPH, /* send to ng_ipfw */
155 O_NGTEE, /* copy to ng_ipfw */
156
157 O_IP4,
158
159 O_UNREACH6, /* arg1=icmpv6 code arg (deny) */
160
161 O_TAG, /* arg1=tag number */
162 O_TAGGED, /* arg1=tag number */
163
164 O_LAST_OPCODE /* not an opcode! */
165 };
166
167 /*
168 * The extension header are filtered only for presence using a bit
169 * vector with a flag for each header.
170 */
171 #define EXT_FRAGMENT 0x1
172 #define EXT_HOPOPTS 0x2
173 #define EXT_ROUTING 0x4
174 #define EXT_AH 0x8
175 #define EXT_ESP 0x10
176 #define EXT_DSTOPTS 0x20
177 #define EXT_RTHDR0 0x40
178 #define EXT_RTHDR2 0x80
179
180 /*
181 * Template for instructions.
182 *
183 * ipfw_insn is used for all instructions which require no operands,
184 * a single 16-bit value (arg1), or a couple of 8-bit values.
185 *
186 * For other instructions which require different/larger arguments
187 * we have derived structures, ipfw_insn_*.
188 *
189 * The size of the instruction (in 32-bit words) is in the low
190 * 6 bits of "len". The 2 remaining bits are used to implement
191 * NOT and OR on individual instructions. Given a type, you can
192 * compute the length to be put in "len" using F_INSN_SIZE(t)
193 *
194 * F_NOT negates the match result of the instruction.
195 *
196 * F_OR is used to build or blocks. By default, instructions
197 * are evaluated as part of a logical AND. An "or" block
198 * { X or Y or Z } contains F_OR set in all but the last
199 * instruction of the block. A match will cause the code
200 * to skip past the last instruction of the block.
201 *
202 * NOTA BENE: in a couple of places we assume that
203 * sizeof(ipfw_insn) == sizeof(u_int32_t)
204 * this needs to be fixed.
205 *
206 */
207 typedef struct _ipfw_insn { /* template for instructions */
208 enum ipfw_opcodes opcode:8;
209 u_int8_t len; /* numer of 32-byte words */
210 #define F_NOT 0x80
211 #define F_OR 0x40
212 #define F_LEN_MASK 0x3f
213 #define F_LEN(cmd) ((cmd)->len & F_LEN_MASK)
214
215 u_int16_t arg1;
216 } ipfw_insn;
217
218 /*
219 * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
220 * a given type.
221 */
222 #define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t))
223
224 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
225
226 /*
227 * This is used to store an array of 16-bit entries (ports etc.)
228 */
229 typedef struct _ipfw_insn_u16 {
230 ipfw_insn o;
231 u_int16_t ports[2]; /* there may be more */
232 } ipfw_insn_u16;
233
234 /*
235 * This is used to store an array of 32-bit entries
236 * (uid, single IPv4 addresses etc.)
237 */
238 typedef struct _ipfw_insn_u32 {
239 ipfw_insn o;
240 u_int32_t d[1]; /* one or more */
241 } ipfw_insn_u32;
242
243 /*
244 * This is used to store IP addr-mask pairs.
245 */
246 typedef struct _ipfw_insn_ip {
247 ipfw_insn o;
248 struct in_addr addr;
249 struct in_addr mask;
250 } ipfw_insn_ip;
251
252 /*
253 * This is used to forward to a given address (ip).
254 */
255 typedef struct _ipfw_insn_sa {
256 ipfw_insn o;
257 struct sockaddr_in sa;
258 } ipfw_insn_sa;
259
260 /*
261 * This is used for MAC addr-mask pairs.
262 */
263 typedef struct _ipfw_insn_mac {
264 ipfw_insn o;
265 u_char addr[12]; /* dst[6] + src[6] */
266 u_char mask[12]; /* dst[6] + src[6] */
267 } ipfw_insn_mac;
268
269 /*
270 * This is used for interface match rules (recv xx, xmit xx).
271 */
272 typedef struct _ipfw_insn_if {
273 ipfw_insn o;
274 union {
275 struct in_addr ip;
276 int glob;
277 } p;
278 char name[IFNAMSIZ];
279 } ipfw_insn_if;
280
281 /*
282 * This is used for storing an altq queue id number.
283 */
284 typedef struct _ipfw_insn_altq {
285 ipfw_insn o;
286 u_int32_t qid;
287 } ipfw_insn_altq;
288
289 /*
290 * This is used for limit rules.
291 */
292 typedef struct _ipfw_insn_limit {
293 ipfw_insn o;
294 u_int8_t _pad;
295 u_int8_t limit_mask; /* combination of DYN_* below */
296 #define DYN_SRC_ADDR 0x1
297 #define DYN_SRC_PORT 0x2
298 #define DYN_DST_ADDR 0x4
299 #define DYN_DST_PORT 0x8
300
301 u_int16_t conn_limit;
302 } ipfw_insn_limit;
303
304 /*
305 * This is used for log instructions.
306 */
307 typedef struct _ipfw_insn_log {
308 ipfw_insn o;
309 u_int32_t max_log; /* how many do we log -- 0 = all */
310 u_int32_t log_left; /* how many left to log */
311 } ipfw_insn_log;
312
313 /*
314 * Data structures required by both ipfw(8) and ipfw(4) but not part of the
315 * management API are protcted by IPFW_INTERNAL.
316 */
317 #ifdef IPFW_INTERNAL
318 /* Server pool support (LSNAT). */
319 struct cfg_spool {
320 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
321 struct in_addr addr;
322 u_short port;
323 };
324 #endif
325
326 /* Redirect modes id. */
327 #define REDIR_ADDR 0x01
328 #define REDIR_PORT 0x02
329 #define REDIR_PROTO 0x04
330
331 #ifdef IPFW_INTERNAL
332 /* Nat redirect configuration. */
333 struct cfg_redir {
334 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
335 u_int16_t mode; /* type of redirect mode */
336 struct in_addr laddr; /* local ip address */
337 struct in_addr paddr; /* public ip address */
338 struct in_addr raddr; /* remote ip address */
339 u_short lport; /* local port */
340 u_short pport; /* public port */
341 u_short rport; /* remote port */
342 u_short pport_cnt; /* number of public ports */
343 u_short rport_cnt; /* number of remote ports */
344 int proto; /* protocol: tcp/udp */
345 struct alias_link **alink;
346 /* num of entry in spool chain */
347 u_int16_t spool_cnt;
348 /* chain of spool instances */
349 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
350 };
351 #endif
352
353 #define NAT_BUF_LEN 1024
354
355 #ifdef IPFW_INTERNAL
356 /* Nat configuration data struct. */
357 struct cfg_nat {
358 /* chain of nat instances */
359 LIST_ENTRY(cfg_nat) _next;
360 int id; /* nat id */
361 struct in_addr ip; /* nat ip address */
362 char if_name[IF_NAMESIZE]; /* interface name */
363 int mode; /* aliasing mode */
364 struct libalias *lib; /* libalias instance */
365 /* number of entry in spool chain */
366 int redir_cnt;
367 /* chain of redir instances */
368 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
369 };
370 #endif
371
372 #define SOF_NAT sizeof(struct cfg_nat)
373 #define SOF_REDIR sizeof(struct cfg_redir)
374 #define SOF_SPOOL sizeof(struct cfg_spool)
375
376 /* Nat command. */
377 typedef struct _ipfw_insn_nat {
378 ipfw_insn o;
379 struct cfg_nat *nat;
380 } ipfw_insn_nat;
381
382 /* Apply ipv6 mask on ipv6 addr */
383 #define APPLY_MASK(addr,mask) \
384 (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
385 (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
386 (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
387 (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
388
389 /* Structure for ipv6 */
390 typedef struct _ipfw_insn_ip6 {
391 ipfw_insn o;
392 struct in6_addr addr6;
393 struct in6_addr mask6;
394 } ipfw_insn_ip6;
395
396 /* Used to support icmp6 types */
397 typedef struct _ipfw_insn_icmp6 {
398 ipfw_insn o;
399 uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
400 * define ICMP6_MAXTYPE
401 * as follows: n = ICMP6_MAXTYPE/32 + 1
402 * Actually is 203
403 */
404 } ipfw_insn_icmp6;
405
406 /*
407 * Here we have the structure representing an ipfw rule.
408 *
409 * It starts with a general area (with link fields and counters)
410 * followed by an array of one or more instructions, which the code
411 * accesses as an array of 32-bit values.
412 *
413 * Given a rule pointer r:
414 *
415 * r->cmd is the start of the first instruction.
416 * ACTION_PTR(r) is the start of the first action (things to do
417 * once a rule matched).
418 *
419 * When assembling instruction, remember the following:
420 *
421 * + if a rule has a "keep-state" (or "limit") option, then the
422 * first instruction (at r->cmd) MUST BE an O_PROBE_STATE
423 * + if a rule has a "log" option, then the first action
424 * (at ACTION_PTR(r)) MUST be O_LOG
425 * + if a rule has an "altq" option, it comes after "log"
426 * + if a rule has an O_TAG option, it comes after "log" and "altq"
427 *
428 * NOTE: we use a simple linked list of rules because we never need
429 * to delete a rule without scanning the list. We do not use
430 * queue(3) macros for portability and readability.
431 */
432
433 struct ip_fw {
434 struct ip_fw *next; /* linked list of rules */
435 struct ip_fw *next_rule; /* ptr to next [skipto] rule */
436 /* 'next_rule' is used to pass up 'set_disable' status */
437
438 u_int16_t act_ofs; /* offset of action in 32-bit units */
439 u_int16_t cmd_len; /* # of 32-bit words in cmd */
440 u_int16_t rulenum; /* rule number */
441 u_int8_t set; /* rule set (0..31) */
442 #define RESVD_SET 31 /* set for default and persistent rules */
443 u_int8_t _pad; /* padding */
444
445 /* These fields are present in all rules. */
446 u_int64_t pcnt; /* Packet counter */
447 u_int64_t bcnt; /* Byte counter */
448 u_int32_t timestamp; /* tv_sec of last match */
449
450 ipfw_insn cmd[1]; /* storage for commands */
451 };
452
453 #define ACTION_PTR(rule) \
454 (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
455
456 #define RULESIZE(rule) (sizeof(struct ip_fw) + \
457 ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
458
459 /*
460 * This structure is used as a flow mask and a flow id for various
461 * parts of the code.
462 */
463 struct ipfw_flow_id {
464 u_int32_t dst_ip;
465 u_int32_t src_ip;
466 u_int16_t dst_port;
467 u_int16_t src_port;
468 u_int8_t proto;
469 u_int8_t flags; /* protocol-specific flags */
470 uint8_t addr_type; /* 4 = ipv4, 6 = ipv6, 1=ether ? */
471 struct in6_addr dst_ip6; /* could also store MAC addr! */
472 struct in6_addr src_ip6;
473 u_int32_t flow_id6;
474 u_int32_t frag_id6;
475 };
476
477 #define IS_IP6_FLOW_ID(id) ((id)->addr_type == 6)
478
479 /*
480 * Dynamic ipfw rule.
481 */
482 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
483
484 struct _ipfw_dyn_rule {
485 ipfw_dyn_rule *next; /* linked list of rules. */
486 struct ip_fw *rule; /* pointer to rule */
487 /* 'rule' is used to pass up the rule number (from the parent) */
488
489 ipfw_dyn_rule *parent; /* pointer to parent rule */
490 u_int64_t pcnt; /* packet match counter */
491 u_int64_t bcnt; /* byte match counter */
492 struct ipfw_flow_id id; /* (masked) flow id */
493 u_int32_t expire; /* expire time */
494 u_int32_t bucket; /* which bucket in hash table */
495 u_int32_t state; /* state of this rule (typically a
496 * combination of TCP flags)
497 */
498 u_int32_t ack_fwd; /* most recent ACKs in forward */
499 u_int32_t ack_rev; /* and reverse directions (used */
500 /* to generate keepalives) */
501 u_int16_t dyn_type; /* rule type */
502 u_int16_t count; /* refcount */
503 };
504
505 /*
506 * Definitions for IP option names.
507 */
508 #define IP_FW_IPOPT_LSRR 0x01
509 #define IP_FW_IPOPT_SSRR 0x02
510 #define IP_FW_IPOPT_RR 0x04
511 #define IP_FW_IPOPT_TS 0x08
512
513 /*
514 * Definitions for TCP option names.
515 */
516 #define IP_FW_TCPOPT_MSS 0x01
517 #define IP_FW_TCPOPT_WINDOW 0x02
518 #define IP_FW_TCPOPT_SACK 0x04
519 #define IP_FW_TCPOPT_TS 0x08
520 #define IP_FW_TCPOPT_CC 0x10
521
522 #define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */
523 #define ICMP6_UNREACH_RST 0x100 /* fake ICMPv6 code (send a TCP RST) */
524
525 /*
526 * These are used for lookup tables.
527 */
528 typedef struct _ipfw_table_entry {
529 in_addr_t addr; /* network address */
530 u_int32_t value; /* value */
531 u_int16_t tbl; /* table number */
532 u_int8_t masklen; /* mask length */
533 } ipfw_table_entry;
534
535 typedef struct _ipfw_table {
536 u_int32_t size; /* size of entries in bytes */
537 u_int32_t cnt; /* # of entries */
538 u_int16_t tbl; /* table number */
539 ipfw_table_entry ent[0]; /* entries */
540 } ipfw_table;
541
542 #define IP_FW_TABLEARG 65535
543
544 /*
545 * Main firewall chains definitions and global var's definitions.
546 */
547 #ifdef _KERNEL
548
549 /* Return values from ipfw_chk() */
550 enum {
551 IP_FW_PASS = 0,
552 IP_FW_DENY,
553 IP_FW_DIVERT,
554 IP_FW_TEE,
555 IP_FW_DUMMYNET,
556 IP_FW_NETGRAPH,
557 IP_FW_NGTEE,
558 IP_FW_NAT,
559 };
560
561 /* flags for divert mtag */
562 #define IP_FW_DIVERT_LOOPBACK_FLAG 0x00080000
563 #define IP_FW_DIVERT_OUTPUT_FLAG 0x00100000
564
565 /*
566 * Structure for collecting parameters to dummynet for ip6_output forwarding
567 */
568 struct _ip6dn_args {
569 struct ip6_pktopts *opt_or;
570 struct route_in6 ro_or;
571 int flags_or;
572 struct ip6_moptions *im6o_or;
573 struct ifnet *origifp_or;
574 struct ifnet *ifp_or;
575 struct sockaddr_in6 dst_or;
576 u_long mtu_or;
577 struct route_in6 ro_pmtu_or;
578 };
579
580 /*
581 * Arguments for calling ipfw_chk() and dummynet_io(). We put them
582 * all into a structure because this way it is easier and more
583 * efficient to pass variables around and extend the interface.
584 */
585 struct ip_fw_args {
586 struct mbuf *m; /* the mbuf chain */
587 struct ifnet *oif; /* output interface */
588 struct sockaddr_in *next_hop; /* forward address */
589 struct ip_fw *rule; /* matching rule */
590 struct ether_header *eh; /* for bridged packets */
591
592 struct ipfw_flow_id f_id; /* grabbed from IP header */
593 u_int32_t cookie; /* a cookie depending on rule action */
594 struct inpcb *inp;
595
596 struct _ip6dn_args dummypar; /* dummynet->ip6_output */
597 struct sockaddr_in hopstore; /* store here if cannot use a pointer */
598 };
599
600 /*
601 * Function definitions.
602 */
603
604 /* Firewall hooks */
605 struct sockopt;
606 struct dn_flow_set;
607
608 int ipfw_check_in(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
609 int ipfw_check_out(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
610
611 int ipfw_chk(struct ip_fw_args *);
612
613 int ipfw_init(void);
614 void ipfw_destroy(void);
615
616 typedef int ip_fw_ctl_t(struct sockopt *);
617 extern ip_fw_ctl_t *ip_fw_ctl_ptr;
618 extern int fw_one_pass;
619 extern int fw_enable;
620 #ifdef INET6
621 extern int fw6_enable;
622 #endif
623
624 /* For kernel ipfw_ether and ipfw_bridge. */
625 typedef int ip_fw_chk_t(struct ip_fw_args *args);
626 extern ip_fw_chk_t *ip_fw_chk_ptr;
627 #define IPFW_LOADED (ip_fw_chk_ptr != NULL)
628
629 #endif /* _KERNEL */
630 #endif /* _IPFW2_H */
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