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: src/sys/netinet/ip_fw.h,v 1.119 2008/10/10 14:33:47 rwatson Exp $
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 * The number of ipfw tables. The maximum allowed table number is the
41 * (IPFW_TABLES_MAX - 1).
42 */
43 #define IPFW_TABLES_MAX 128
44
45 /*
46 * The kernel representation of ipfw rules is made of a list of
47 * 'instructions' (for all practical purposes equivalent to BPF
48 * instructions), which specify which fields of the packet
49 * (or its metadata) should be analysed.
50 *
51 * Each instruction is stored in a structure which begins with
52 * "ipfw_insn", and can contain extra fields depending on the
53 * instruction type (listed below).
54 * Note that the code is written so that individual instructions
55 * have a size which is a multiple of 32 bits. This means that, if
56 * such structures contain pointers or other 64-bit entities,
57 * (there is just one instance now) they may end up unaligned on
58 * 64-bit architectures, so the must be handled with care.
59 *
60 * "enum ipfw_opcodes" are the opcodes supported. We can have up
61 * to 256 different opcodes. When adding new opcodes, they should
62 * be appended to the end of the opcode list before O_LAST_OPCODE,
63 * this will prevent the ABI from being broken, otherwise users
64 * will have to recompile ipfw(8) when they update the kernel.
65 */
66
67 enum ipfw_opcodes { /* arguments (4 byte each) */
68 O_NOP,
69
70 O_IP_SRC, /* u32 = IP */
71 O_IP_SRC_MASK, /* ip = IP/mask */
72 O_IP_SRC_ME, /* none */
73 O_IP_SRC_SET, /* u32=base, arg1=len, bitmap */
74
75 O_IP_DST, /* u32 = IP */
76 O_IP_DST_MASK, /* ip = IP/mask */
77 O_IP_DST_ME, /* none */
78 O_IP_DST_SET, /* u32=base, arg1=len, bitmap */
79
80 O_IP_SRCPORT, /* (n)port list:mask 4 byte ea */
81 O_IP_DSTPORT, /* (n)port list:mask 4 byte ea */
82 O_PROTO, /* arg1=protocol */
83
84 O_MACADDR2, /* 2 mac addr:mask */
85 O_MAC_TYPE, /* same as srcport */
86
87 O_LAYER2, /* none */
88 O_IN, /* none */
89 O_FRAG, /* none */
90
91 O_RECV, /* none */
92 O_XMIT, /* none */
93 O_VIA, /* none */
94
95 O_IPOPT, /* arg1 = 2*u8 bitmap */
96 O_IPLEN, /* arg1 = len */
97 O_IPID, /* arg1 = id */
98
99 O_IPTOS, /* arg1 = id */
100 O_IPPRECEDENCE, /* arg1 = precedence << 5 */
101 O_IPTTL, /* arg1 = TTL */
102
103 O_IPVER, /* arg1 = version */
104 O_UID, /* u32 = id */
105 O_GID, /* u32 = id */
106 O_ESTAB, /* none (tcp established) */
107 O_TCPFLAGS, /* arg1 = 2*u8 bitmap */
108 O_TCPWIN, /* arg1 = desired win */
109 O_TCPSEQ, /* u32 = desired seq. */
110 O_TCPACK, /* u32 = desired seq. */
111 O_ICMPTYPE, /* u32 = icmp bitmap */
112 O_TCPOPTS, /* arg1 = 2*u8 bitmap */
113
114 O_VERREVPATH, /* none */
115 O_VERSRCREACH, /* none */
116
117 O_PROBE_STATE, /* none */
118 O_KEEP_STATE, /* none */
119 O_LIMIT, /* ipfw_insn_limit */
120 O_LIMIT_PARENT, /* dyn_type, not an opcode. */
121
122 /*
123 * These are really 'actions'.
124 */
125
126 O_LOG, /* ipfw_insn_log */
127 O_PROB, /* u32 = match probability */
128
129 O_CHECK_STATE, /* none */
130 O_ACCEPT, /* none */
131 O_DENY, /* none */
132 O_REJECT, /* arg1=icmp arg (same as deny) */
133 O_COUNT, /* none */
134 O_SKIPTO, /* arg1=next rule number */
135 O_PIPE, /* arg1=pipe number */
136 O_QUEUE, /* arg1=queue number */
137 O_DIVERT, /* arg1=port number */
138 O_TEE, /* arg1=port number */
139 O_FORWARD_IP, /* fwd sockaddr */
140 O_FORWARD_MAC, /* fwd mac */
141 O_NAT, /* nope */
142
143 /*
144 * More opcodes.
145 */
146 O_IPSEC, /* has ipsec history */
147 O_IP_SRC_LOOKUP, /* arg1=table number, u32=value */
148 O_IP_DST_LOOKUP, /* arg1=table number, u32=value */
149 O_ANTISPOOF, /* none */
150 O_JAIL, /* u32 = id */
151 O_ALTQ, /* u32 = altq classif. qid */
152 O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */
153 O_TCPDATALEN, /* arg1 = tcp data len */
154 O_IP6_SRC, /* address without mask */
155 O_IP6_SRC_ME, /* my addresses */
156 O_IP6_SRC_MASK, /* address with the mask */
157 O_IP6_DST,
158 O_IP6_DST_ME,
159 O_IP6_DST_MASK,
160 O_FLOW6ID, /* for flow id tag in the ipv6 pkt */
161 O_ICMP6TYPE, /* icmp6 packet type filtering */
162 O_EXT_HDR, /* filtering for ipv6 extension header */
163 O_IP6,
164
165 /*
166 * actions for ng_ipfw
167 */
168 O_NETGRAPH, /* send to ng_ipfw */
169 O_NGTEE, /* copy to ng_ipfw */
170
171 O_IP4,
172
173 O_UNREACH6, /* arg1=icmpv6 code arg (deny) */
174
175 O_TAG, /* arg1=tag number */
176 O_TAGGED, /* arg1=tag number */
177
178 O_SETFIB, /* arg1=FIB number */
179 O_FIB, /* arg1=FIB desired fib number */
180
181 O_LAST_OPCODE /* not an opcode! */
182 };
183
184 /*
185 * The extension header are filtered only for presence using a bit
186 * vector with a flag for each header.
187 */
188 #define EXT_FRAGMENT 0x1
189 #define EXT_HOPOPTS 0x2
190 #define EXT_ROUTING 0x4
191 #define EXT_AH 0x8
192 #define EXT_ESP 0x10
193 #define EXT_DSTOPTS 0x20
194 #define EXT_RTHDR0 0x40
195 #define EXT_RTHDR2 0x80
196
197 /*
198 * Template for instructions.
199 *
200 * ipfw_insn is used for all instructions which require no operands,
201 * a single 16-bit value (arg1), or a couple of 8-bit values.
202 *
203 * For other instructions which require different/larger arguments
204 * we have derived structures, ipfw_insn_*.
205 *
206 * The size of the instruction (in 32-bit words) is in the low
207 * 6 bits of "len". The 2 remaining bits are used to implement
208 * NOT and OR on individual instructions. Given a type, you can
209 * compute the length to be put in "len" using F_INSN_SIZE(t)
210 *
211 * F_NOT negates the match result of the instruction.
212 *
213 * F_OR is used to build or blocks. By default, instructions
214 * are evaluated as part of a logical AND. An "or" block
215 * { X or Y or Z } contains F_OR set in all but the last
216 * instruction of the block. A match will cause the code
217 * to skip past the last instruction of the block.
218 *
219 * NOTA BENE: in a couple of places we assume that
220 * sizeof(ipfw_insn) == sizeof(u_int32_t)
221 * this needs to be fixed.
222 *
223 */
224 typedef struct _ipfw_insn { /* template for instructions */
225 enum ipfw_opcodes opcode:8;
226 u_int8_t len; /* number of 32-bit words */
227 #define F_NOT 0x80
228 #define F_OR 0x40
229 #define F_LEN_MASK 0x3f
230 #define F_LEN(cmd) ((cmd)->len & F_LEN_MASK)
231
232 u_int16_t arg1;
233 } ipfw_insn;
234
235 /*
236 * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
237 * a given type.
238 */
239 #define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t))
240
241 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
242
243 /*
244 * This is used to store an array of 16-bit entries (ports etc.)
245 */
246 typedef struct _ipfw_insn_u16 {
247 ipfw_insn o;
248 u_int16_t ports[2]; /* there may be more */
249 } ipfw_insn_u16;
250
251 /*
252 * This is used to store an array of 32-bit entries
253 * (uid, single IPv4 addresses etc.)
254 */
255 typedef struct _ipfw_insn_u32 {
256 ipfw_insn o;
257 u_int32_t d[1]; /* one or more */
258 } ipfw_insn_u32;
259
260 /*
261 * This is used to store IP addr-mask pairs.
262 */
263 typedef struct _ipfw_insn_ip {
264 ipfw_insn o;
265 struct in_addr addr;
266 struct in_addr mask;
267 } ipfw_insn_ip;
268
269 /*
270 * This is used to forward to a given address (ip).
271 */
272 typedef struct _ipfw_insn_sa {
273 ipfw_insn o;
274 struct sockaddr_in sa;
275 } ipfw_insn_sa;
276
277 /*
278 * This is used for MAC addr-mask pairs.
279 */
280 typedef struct _ipfw_insn_mac {
281 ipfw_insn o;
282 u_char addr[12]; /* dst[6] + src[6] */
283 u_char mask[12]; /* dst[6] + src[6] */
284 } ipfw_insn_mac;
285
286 /*
287 * This is used for interface match rules (recv xx, xmit xx).
288 */
289 typedef struct _ipfw_insn_if {
290 ipfw_insn o;
291 union {
292 struct in_addr ip;
293 int glob;
294 } p;
295 char name[IFNAMSIZ];
296 } ipfw_insn_if;
297
298 /*
299 * This is used for storing an altq queue id number.
300 */
301 typedef struct _ipfw_insn_altq {
302 ipfw_insn o;
303 u_int32_t qid;
304 } ipfw_insn_altq;
305
306 /*
307 * This is used for limit rules.
308 */
309 typedef struct _ipfw_insn_limit {
310 ipfw_insn o;
311 u_int8_t _pad;
312 u_int8_t limit_mask; /* combination of DYN_* below */
313 #define DYN_SRC_ADDR 0x1
314 #define DYN_SRC_PORT 0x2
315 #define DYN_DST_ADDR 0x4
316 #define DYN_DST_PORT 0x8
317
318 u_int16_t conn_limit;
319 } ipfw_insn_limit;
320
321 /*
322 * This is used for log instructions.
323 */
324 typedef struct _ipfw_insn_log {
325 ipfw_insn o;
326 u_int32_t max_log; /* how many do we log -- 0 = all */
327 u_int32_t log_left; /* how many left to log */
328 } ipfw_insn_log;
329
330 /*
331 * Data structures required by both ipfw(8) and ipfw(4) but not part of the
332 * management API are protected by IPFW_INTERNAL.
333 */
334 #ifdef IPFW_INTERNAL
335 /* Server pool support (LSNAT). */
336 struct cfg_spool {
337 LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
338 struct in_addr addr;
339 u_short port;
340 };
341 #endif
342
343 /* Redirect modes id. */
344 #define REDIR_ADDR 0x01
345 #define REDIR_PORT 0x02
346 #define REDIR_PROTO 0x04
347
348 #ifdef IPFW_INTERNAL
349 /* Nat redirect configuration. */
350 struct cfg_redir {
351 LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
352 u_int16_t mode; /* type of redirect mode */
353 struct in_addr laddr; /* local ip address */
354 struct in_addr paddr; /* public ip address */
355 struct in_addr raddr; /* remote ip address */
356 u_short lport; /* local port */
357 u_short pport; /* public port */
358 u_short rport; /* remote port */
359 u_short pport_cnt; /* number of public ports */
360 u_short rport_cnt; /* number of remote ports */
361 int proto; /* protocol: tcp/udp */
362 struct alias_link **alink;
363 /* num of entry in spool chain */
364 u_int16_t spool_cnt;
365 /* chain of spool instances */
366 LIST_HEAD(spool_chain, cfg_spool) spool_chain;
367 };
368 #endif
369
370 #define NAT_BUF_LEN 1024
371
372 #ifdef IPFW_INTERNAL
373 /* Nat configuration data struct. */
374 struct cfg_nat {
375 /* chain of nat instances */
376 LIST_ENTRY(cfg_nat) _next;
377 int id; /* nat id */
378 struct in_addr ip; /* nat ip address */
379 char if_name[IF_NAMESIZE]; /* interface name */
380 int mode; /* aliasing mode */
381 struct libalias *lib; /* libalias instance */
382 /* number of entry in spool chain */
383 int redir_cnt;
384 /* chain of redir instances */
385 LIST_HEAD(redir_chain, cfg_redir) redir_chain;
386 };
387 #endif
388
389 #define SOF_NAT sizeof(struct cfg_nat)
390 #define SOF_REDIR sizeof(struct cfg_redir)
391 #define SOF_SPOOL sizeof(struct cfg_spool)
392
393 /* Nat command. */
394 typedef struct _ipfw_insn_nat {
395 ipfw_insn o;
396 struct cfg_nat *nat;
397 } ipfw_insn_nat;
398
399 /* Apply ipv6 mask on ipv6 addr */
400 #define APPLY_MASK(addr,mask) \
401 (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
402 (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
403 (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
404 (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
405
406 /* Structure for ipv6 */
407 typedef struct _ipfw_insn_ip6 {
408 ipfw_insn o;
409 struct in6_addr addr6;
410 struct in6_addr mask6;
411 } ipfw_insn_ip6;
412
413 /* Used to support icmp6 types */
414 typedef struct _ipfw_insn_icmp6 {
415 ipfw_insn o;
416 uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
417 * define ICMP6_MAXTYPE
418 * as follows: n = ICMP6_MAXTYPE/32 + 1
419 * Actually is 203
420 */
421 } ipfw_insn_icmp6;
422
423 /*
424 * Here we have the structure representing an ipfw rule.
425 *
426 * It starts with a general area (with link fields and counters)
427 * followed by an array of one or more instructions, which the code
428 * accesses as an array of 32-bit values.
429 *
430 * Given a rule pointer r:
431 *
432 * r->cmd is the start of the first instruction.
433 * ACTION_PTR(r) is the start of the first action (things to do
434 * once a rule matched).
435 *
436 * When assembling instruction, remember the following:
437 *
438 * + if a rule has a "keep-state" (or "limit") option, then the
439 * first instruction (at r->cmd) MUST BE an O_PROBE_STATE
440 * + if a rule has a "log" option, then the first action
441 * (at ACTION_PTR(r)) MUST be O_LOG
442 * + if a rule has an "altq" option, it comes after "log"
443 * + if a rule has an O_TAG option, it comes after "log" and "altq"
444 *
445 * NOTE: we use a simple linked list of rules because we never need
446 * to delete a rule without scanning the list. We do not use
447 * queue(3) macros for portability and readability.
448 */
449
450 struct ip_fw {
451 struct ip_fw *next; /* linked list of rules */
452 struct ip_fw *next_rule; /* ptr to next [skipto] rule */
453 /* 'next_rule' is used to pass up 'set_disable' status */
454
455 u_int16_t act_ofs; /* offset of action in 32-bit units */
456 u_int16_t cmd_len; /* # of 32-bit words in cmd */
457 u_int16_t rulenum; /* rule number */
458 u_int8_t set; /* rule set (0..31) */
459 #define RESVD_SET 31 /* set for default and persistent rules */
460 u_int8_t _pad; /* padding */
461
462 /* These fields are present in all rules. */
463 u_int64_t pcnt; /* Packet counter */
464 u_int64_t bcnt; /* Byte counter */
465 u_int32_t timestamp; /* tv_sec of last match */
466
467 ipfw_insn cmd[1]; /* storage for commands */
468 };
469
470 #define ACTION_PTR(rule) \
471 (ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
472
473 #define RULESIZE(rule) (sizeof(struct ip_fw) + \
474 ((struct ip_fw *)(rule))->cmd_len * 4 - 4)
475
476 /*
477 * This structure is used as a flow mask and a flow id for various
478 * parts of the code.
479 */
480 struct ipfw_flow_id {
481 u_int32_t dst_ip;
482 u_int32_t src_ip;
483 u_int16_t dst_port;
484 u_int16_t src_port;
485 u_int8_t fib;
486 u_int8_t proto;
487 u_int8_t flags; /* protocol-specific flags */
488 uint8_t addr_type; /* 4 = ipv4, 6 = ipv6, 1=ether ? */
489 struct in6_addr dst_ip6; /* could also store MAC addr! */
490 struct in6_addr src_ip6;
491 u_int32_t flow_id6;
492 u_int32_t frag_id6;
493 };
494
495 #define IS_IP6_FLOW_ID(id) ((id)->addr_type == 6)
496
497 /*
498 * Dynamic ipfw rule.
499 */
500 typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
501
502 struct _ipfw_dyn_rule {
503 ipfw_dyn_rule *next; /* linked list of rules. */
504 struct ip_fw *rule; /* pointer to rule */
505 /* 'rule' is used to pass up the rule number (from the parent) */
506
507 ipfw_dyn_rule *parent; /* pointer to parent rule */
508 u_int64_t pcnt; /* packet match counter */
509 u_int64_t bcnt; /* byte match counter */
510 struct ipfw_flow_id id; /* (masked) flow id */
511 u_int32_t expire; /* expire time */
512 u_int32_t bucket; /* which bucket in hash table */
513 u_int32_t state; /* state of this rule (typically a
514 * combination of TCP flags)
515 */
516 u_int32_t ack_fwd; /* most recent ACKs in forward */
517 u_int32_t ack_rev; /* and reverse directions (used */
518 /* to generate keepalives) */
519 u_int16_t dyn_type; /* rule type */
520 u_int16_t count; /* refcount */
521 };
522
523 /*
524 * Definitions for IP option names.
525 */
526 #define IP_FW_IPOPT_LSRR 0x01
527 #define IP_FW_IPOPT_SSRR 0x02
528 #define IP_FW_IPOPT_RR 0x04
529 #define IP_FW_IPOPT_TS 0x08
530
531 /*
532 * Definitions for TCP option names.
533 */
534 #define IP_FW_TCPOPT_MSS 0x01
535 #define IP_FW_TCPOPT_WINDOW 0x02
536 #define IP_FW_TCPOPT_SACK 0x04
537 #define IP_FW_TCPOPT_TS 0x08
538 #define IP_FW_TCPOPT_CC 0x10
539
540 #define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */
541 #define ICMP6_UNREACH_RST 0x100 /* fake ICMPv6 code (send a TCP RST) */
542
543 /*
544 * These are used for lookup tables.
545 */
546 typedef struct _ipfw_table_entry {
547 in_addr_t addr; /* network address */
548 u_int32_t value; /* value */
549 u_int16_t tbl; /* table number */
550 u_int8_t masklen; /* mask length */
551 } ipfw_table_entry;
552
553 typedef struct _ipfw_table {
554 u_int32_t size; /* size of entries in bytes */
555 u_int32_t cnt; /* # of entries */
556 u_int16_t tbl; /* table number */
557 ipfw_table_entry ent[0]; /* entries */
558 } ipfw_table;
559
560 #define IP_FW_TABLEARG 65535
561
562 /*
563 * Main firewall chains definitions and global var's definitions.
564 */
565 #ifdef _KERNEL
566
567 /* Return values from ipfw_chk() */
568 enum {
569 IP_FW_PASS = 0,
570 IP_FW_DENY,
571 IP_FW_DIVERT,
572 IP_FW_TEE,
573 IP_FW_DUMMYNET,
574 IP_FW_NETGRAPH,
575 IP_FW_NGTEE,
576 IP_FW_NAT,
577 };
578
579 /* flags for divert mtag */
580 #define IP_FW_DIVERT_LOOPBACK_FLAG 0x00080000
581 #define IP_FW_DIVERT_OUTPUT_FLAG 0x00100000
582
583 /*
584 * Structure for collecting parameters to dummynet for ip6_output forwarding
585 */
586 struct _ip6dn_args {
587 struct ip6_pktopts *opt_or;
588 struct route_in6 ro_or;
589 int flags_or;
590 struct ip6_moptions *im6o_or;
591 struct ifnet *origifp_or;
592 struct ifnet *ifp_or;
593 struct sockaddr_in6 dst_or;
594 u_long mtu_or;
595 struct route_in6 ro_pmtu_or;
596 };
597
598 /*
599 * Arguments for calling ipfw_chk() and dummynet_io(). We put them
600 * all into a structure because this way it is easier and more
601 * efficient to pass variables around and extend the interface.
602 */
603 struct ip_fw_args {
604 struct mbuf *m; /* the mbuf chain */
605 struct ifnet *oif; /* output interface */
606 struct sockaddr_in *next_hop; /* forward address */
607 struct ip_fw *rule; /* matching rule */
608 struct ether_header *eh; /* for bridged packets */
609
610 struct ipfw_flow_id f_id; /* grabbed from IP header */
611 u_int32_t cookie; /* a cookie depending on rule action */
612 struct inpcb *inp;
613
614 struct _ip6dn_args dummypar; /* dummynet->ip6_output */
615 struct sockaddr_in hopstore; /* store here if cannot use a pointer */
616 };
617
618 /*
619 * Function definitions.
620 */
621
622 /* Firewall hooks */
623 struct sockopt;
624 struct dn_flow_set;
625
626 int ipfw_check_in(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
627 int ipfw_check_out(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp);
628
629 int ipfw_chk(struct ip_fw_args *);
630
631 int ipfw_init(void);
632 void ipfw_destroy(void);
633 #ifdef NOTYET
634 void ipfw_nat_destroy(void);
635 #endif
636
637 typedef int ip_fw_ctl_t(struct sockopt *);
638 extern ip_fw_ctl_t *ip_fw_ctl_ptr;
639
640 #ifndef VIMAGE
641 extern int fw_one_pass;
642 extern int fw_enable;
643 #ifdef INET6
644 extern int fw6_enable;
645 #endif
646 #endif
647
648 /* For kernel ipfw_ether and ipfw_bridge. */
649 typedef int ip_fw_chk_t(struct ip_fw_args *args);
650 extern ip_fw_chk_t *ip_fw_chk_ptr;
651 #define IPFW_LOADED (ip_fw_chk_ptr != NULL)
652
653 #ifdef IPFW_INTERNAL
654
655 struct ip_fw_chain {
656 struct ip_fw *rules; /* list of rules */
657 struct ip_fw *reap; /* list of rules to reap */
658 LIST_HEAD(, cfg_nat) nat; /* list of nat entries */
659 struct radix_node_head *tables[IPFW_TABLES_MAX];
660 struct rwlock rwmtx;
661 };
662 #define IPFW_LOCK_INIT(_chain) \
663 rw_init(&(_chain)->rwmtx, "IPFW static rules")
664 #define IPFW_LOCK_DESTROY(_chain) rw_destroy(&(_chain)->rwmtx)
665 #define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED)
666
667 #define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx)
668 #define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx)
669 #define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx)
670 #define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx)
671
672 #define LOOKUP_NAT(l, i, p) do { \
673 LIST_FOREACH((p), &(l.nat), _next) { \
674 if ((p)->id == (i)) { \
675 break; \
676 } \
677 } \
678 } while (0)
679
680 typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
681 typedef int ipfw_nat_cfg_t(struct sockopt *);
682 #endif
683
684 /*
685 * Stack virtualization support.
686 */
687 #ifdef VIMAGE
688 struct vnet_ipfw {
689 int _fw_one_pass;
690 int _fw_enable;
691 int _fw6_enable;
692 u_int32_t _set_disable;
693 int _fw_deny_unknown_exthdrs;
694 int _fw_verbose;
695 int _verbose_limit;
696 int _fw_debug;
697 int _autoinc_step;
698 ipfw_dyn_rule **_ipfw_dyn_v;
699 struct ip_fw_chain _layer3_chain;
700 u_int32_t _dyn_buckets;
701 u_int32_t _curr_dyn_buckets;
702 u_int32_t _dyn_ack_lifetime;
703 u_int32_t _dyn_syn_lifetime;
704 u_int32_t _dyn_fin_lifetime;
705 u_int32_t _dyn_rst_lifetime;
706 u_int32_t _dyn_udp_lifetime;
707 u_int32_t _dyn_short_lifetime;
708 u_int32_t _dyn_keepalive_interval;
709 u_int32_t _dyn_keepalive_period;
710 u_int32_t _dyn_keepalive;
711 u_int32_t _static_count;
712 u_int32_t _static_len;
713 u_int32_t _dyn_count;
714 u_int32_t _dyn_max;
715 u_int64_t _norule_counter;
716 struct callout _ipfw_timeout;
717 eventhandler_tag _ifaddr_event_tag;
718 };
719 #endif
720
721 /*
722 * Symbol translation macros
723 */
724 #define INIT_VNET_IPFW(vnet) \
725 INIT_FROM_VNET(vnet, VNET_MOD_IPFW, struct vnet_ipfw, vnet_ipfw)
726
727 #define VNET_IPFW(sym) VSYM(vnet_ipfw, sym)
728
729 #define V_fw_one_pass VNET_IPFW(fw_one_pass)
730 #define V_fw_enable VNET_IPFW(fw_enable)
731 #define V_fw6_enable VNET_IPFW(fw6_enable)
732 #define V_set_disable VNET_IPFW(set_disable)
733 #define V_fw_deny_unknown_exthdrs VNET_IPFW(fw_deny_unknown_exthdrs)
734 #define V_fw_verbose VNET_IPFW(fw_verbose)
735 #define V_verbose_limit VNET_IPFW(verbose_limit)
736 #define V_fw_debug VNET_IPFW(fw_debug)
737 #define V_autoinc_step VNET_IPFW(autoinc_step)
738 #define V_ipfw_dyn_v VNET_IPFW(ipfw_dyn_v)
739 #define V_layer3_chain VNET_IPFW(layer3_chain)
740 #define V_dyn_buckets VNET_IPFW(dyn_buckets)
741 #define V_curr_dyn_buckets VNET_IPFW(curr_dyn_buckets)
742 #define V_dyn_ack_lifetime VNET_IPFW(dyn_ack_lifetime)
743 #define V_dyn_syn_lifetime VNET_IPFW(dyn_syn_lifetime)
744 #define V_dyn_fin_lifetime VNET_IPFW(dyn_fin_lifetime)
745 #define V_dyn_rst_lifetime VNET_IPFW(dyn_rst_lifetime)
746 #define V_dyn_udp_lifetime VNET_IPFW(dyn_udp_lifetime)
747 #define V_dyn_short_lifetime VNET_IPFW(dyn_short_lifetime)
748 #define V_dyn_keepalive_interval VNET_IPFW(dyn_keepalive_interval)
749 #define V_dyn_keepalive_period VNET_IPFW(dyn_keepalive_period)
750 #define V_dyn_keepalive VNET_IPFW(dyn_keepalive)
751 #define V_static_count VNET_IPFW(static_count)
752 #define V_static_len VNET_IPFW(static_len)
753 #define V_dyn_count VNET_IPFW(dyn_count)
754 #define V_dyn_max VNET_IPFW(dyn_max)
755 #define V_norule_counter VNET_IPFW(norule_counter)
756 #define V_ipfw_timeout VNET_IPFW(ipfw_timeout)
757 #define V_ifaddr_event_tag VNET_IPFW(ifaddr_event_tag)
758
759 #endif /* _KERNEL */
760 #endif /* _IPFW2_H */
761
|