ipfw3: insert the new rule in the beginning
[dragonfly.git] / sys / net / ipfw3 / ip_fw3.h
CommitLineData
105c533e 1/*
03c7df6d
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2 * Copyright (c) 1993 Daniel Boulet
3 * Copyright (c) 1994 Ugen J.S.Antsilevich
4 * Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa
4408d548 5 * Copyright (c) 2015 - 2018 The DragonFly Project. All rights reserved.
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6 *
7 * This code is derived from software contributed to The DragonFly Project
e2124e7d 8 * by Bill Yuan <bycn82@dragonflybsd.org>
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9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
fe628012 13 *
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14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
fe628012
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17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 * 3. Neither the name of The DragonFly Project nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific, prior written permission.
105c533e 23 *
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24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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35 * SUCH DAMAGE.
36 *
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37 */
38
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39#ifndef _IP_FW3_H_
40#define _IP_FW3_H_
105c533e 41
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42/*
43 * _IPFW2_H is from ipfw/ip_fw2.h, both cannot be included past this
44 * point but we need both the IPFW2_LOADED and IPFW3_LOADED macros
45 */
46#ifndef _IPFW2_H
47
48
e895e94d 49#include <net/bpf.h>
daaaebdb 50
950193f2 51
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52#define NEED1(msg) {if (ac < 1) errx(EX_USAGE, msg);}
53#define NEED2(msg) {if (ac < 2) errx(EX_USAGE, msg);}
54#define NEED(c, n, msg) {if (c < n) errx(EX_USAGE, msg);}
105c533e 55
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56#define NEXT_ARG ac--; if(ac > 0){av++;}
57#define NEXT_ARG1 (*ac)--; if(*ac > 0){(*av)++;}
58#define SWAP_ARG \
59do { \
60 if (ac > 2 && isdigit(*(av[1]))) { \
61 char *p = av[1]; \
62 av[1] = av[2]; \
63 av[2] = p; \
64 } \
65} while (0)
66
67#define IPFW_RULE_SIZE_MAX 255 /* unit: uint32_t */
950193f2 68
6a03354e 69/*
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70 * type of the keyword, it indecates the position of the keyword in the rule
71 * BEFORE ACTION FROM TO FILTER OTHER
6a03354e 72 */
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73#define NONE 0
74#define BEFORE 1
75#define ACTION 2
76#define PROTO 3
77#define FROM 4
78#define TO 5
79#define FILTER 6
80#define AFTER 7
81
82#define NOT_IN_USE 0
83#define IN_USE 1
950193f2 84
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85#define SIZE_OF_IPFWINSN 8
86#define LEN_OF_IPFWINSN 2
87#define IPFW_DEFAULT_RULE 65535
88#define IPFW_DEFAULT_SET 0
89#define IPFW_ALL_SETS 0
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90
91/*
92 * Template for instructions.
93 *
94 * ipfw_insn is used for all instructions which require no operands,
95 * a single 16-bit value (arg1), or a couple of 8-bit values.
96 *
97 * For other instructions which require different/larger arguments
98 * we have derived structures, ipfw_insn_*.
99 *
100 * The size of the instruction (in 32-bit words) is in the low
101 * 6 bits of "len". The 2 remaining bits are used to implement
102 * NOT and OR on individual instructions. Given a type, you can
103 * compute the length to be put in "len" using F_INSN_SIZE(t)
104 *
105 * F_NOT negates the match result of the instruction.
106 *
107 * F_OR is used to build or blocks. By default, instructions
108 * are evaluated as part of a logical AND. An "or" block
109 * { X or Y or Z } contains F_OR set in all but the last
110 * instruction of the block. A match will cause the code
111 * to skip past the last instruction of the block.
112 *
113 * NOTA BENE: in a couple of places we assume that
114 * sizeof(ipfw_insn) == sizeof(uint32_t)
115 * this needs to be fixed.
116 *
117 */
118
119#define F_NOT 0x80
120#define F_OR 0x40
121#define F_LEN_MASK 0x3f
122#define F_LEN(cmd) ((cmd)->len & F_LEN_MASK)
123
124typedef struct _ipfw_insn { /* template for instructions */
125 uint8_t opcode;
126 uint8_t len; /* numer of 32-byte words */
127 uint16_t arg1;
128
129 uint8_t module;
130 uint8_t arg3;
131 uint16_t arg2;
132} ipfw_insn;
133
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134#define ACTION_PTR(rule) \
135 (ipfw_insn *)((uint32_t *)((rule)->cmd) + ((rule)->act_ofs))
136
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137/*
138 * The F_INSN_SIZE(type) computes the size, in 4-byte words, of
139 * a given type.
140 */
141#define F_INSN_SIZE(t) ((sizeof (t))/sizeof(uint32_t))
142
143#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
144
145/*
146 * This is used to store an array of 16-bit entries (ports etc.)
147 */
148typedef struct _ipfw_insn_u16 {
149 ipfw_insn o;
150 uint16_t ports[2]; /* there may be more */
151} ipfw_insn_u16;
152
153/*
154 * This is used to store an array of 32-bit entries
155 * (uid, single IPv4 addresses etc.)
156 */
157typedef struct _ipfw_insn_u32 {
158 ipfw_insn o;
159 uint32_t d[1]; /* one or more */
160} ipfw_insn_u32;
161
162/*
163 * This is used to store IP addr-mask pairs.
164 */
165typedef struct _ipfw_insn_ip {
166 ipfw_insn o;
167 struct in_addr addr;
168 struct in_addr mask;
169} ipfw_insn_ip;
170
171/*
172 * This is used to forward to a given address (ip)
173 */
174typedef struct _ipfw_insn_sa {
175 ipfw_insn o;
176 struct sockaddr_in sa;
177} ipfw_insn_sa;
178
179/*
180 * This is used for MAC addr-mask pairs.
181 */
182typedef struct _ipfw_insn_mac {
183 ipfw_insn o;
184 u_char addr[12]; /* dst[6] + src[6] */
185 u_char mask[12]; /* dst[6] + src[6] */
186} ipfw_insn_mac;
187
188/*
189 * This is used for interface match rules (recv xx, xmit xx)
190 */
191typedef struct _ipfw_insn_if {
192 ipfw_insn o;
193 union {
194 struct in_addr ip;
195 int glob;
196 } p;
197 char name[IFNAMSIZ];
198} ipfw_insn_if;
199
200/*
201 * This is used for pipe and queue actions, which need to store
202 * a single pointer (which can have different size on different
203 * architectures.
204 */
205typedef struct _ipfw_insn_pipe {
206 ipfw_insn o;
207 void *pipe_ptr;
208} ipfw_insn_pipe;
209
210/*
211 * This is used for limit rules.
212 */
213typedef struct _ipfw_insn_limit {
214 ipfw_insn o;
215 uint8_t _pad;
216 uint8_t limit_mask; /* combination of DYN_* below */
217#define DYN_SRC_ADDR 0x1
218#define DYN_SRC_PORT 0x2
219#define DYN_DST_ADDR 0x4
220#define DYN_DST_PORT 0x8
221
222 uint16_t conn_limit;
223} ipfw_insn_limit;
224
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225/*
226 * This is used for bpf filtering.
227 */
228typedef struct _ipfw_insn_bpf {
229 ipfw_insn o;
230 char bf_str[128];
231 u_int bf_len;
232 struct bpf_insn bf_insn[1];
233} ipfw_insn_bpf;
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234
235/*
236 * Here we have the structure representing an ipfw rule.
237 *
238 * It starts with a general area (with link fields and counters)
239 * followed by an array of one or more instructions, which the code
240 * accesses as an array of 32-bit values.
241 *
242 * Given a rule pointer r:
243 *
244 * r->cmd is the start of the first instruction.
245 * ACTION_PTR(r) is the start of the first action (things to do
246 * once a rule matched).
247 *
248 * When assembling instruction, remember the following:
249 *
250 * + if a rule has a "keep-state" (or "limit") option, then the
251 * first instruction (at r->cmd) MUST BE an O_PROBE_STATE
252 * + if a rule has a "log" option, then the first action
253 * (at ACTION_PTR(r)) MUST be O_LOG
254 *
255 * NOTE: we use a simple linked list of rules because we never need
256 * to delete a rule without scanning the list. We do not use
257 * queue(3) macros for portability and readability.
258 */
259
260struct ip_fw {
261 struct ip_fw *next; /* linked list of rules */
262 struct ip_fw *next_rule; /* ptr to next [skipto] rule */
263 uint16_t act_ofs; /* offset of action in 32-bit units */
264 uint16_t cmd_len; /* # of 32-bit words in cmd */
265 uint16_t rulenum; /* rule number */
266 uint8_t set; /* rule set (0..31) */
267 uint8_t flags; /* IPFW_USR_F_ */
268
269 /* These fields are present in all rules. */
270 uint64_t pcnt; /* Packet counter */
271 uint64_t bcnt; /* Byte counter */
272 uint32_t timestamp; /* tv_sec of last match */
273
274 struct ip_fw *sibling; /* pointer to the rule in next CPU */
275
276 ipfw_insn cmd[1]; /* storage for commands */
277};
4408d548 278#define LEN_FW3 sizeof(struct ip_fw)
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279
280#define IPFW_RULE_F_INVALID 0x1
281#define IPFW_RULE_F_STATE 0x2
282
283#define RULESIZE(rule) (sizeof(struct ip_fw) + (rule)->cmd_len * 4 - SIZE_OF_IPFWINSN)
284
285/*
286 * This structure is used as a flow mask and a flow id for various
287 * parts of the code.
288 */
289struct ipfw_flow_id {
290 uint32_t dst_ip;
291 uint32_t src_ip;
292 uint16_t dst_port;
293 uint16_t src_port;
294 uint8_t proto;
295 uint8_t flags; /* protocol-specific flags */
296};
297
105c533e 298
4408d548 299/* ip_fw3_chk/ip_fw_chk_ptr return values */
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300#define IP_FW_PASS 0
301#define IP_FW_DENY 1
302#define IP_FW_DIVERT 2
303#define IP_FW_TEE 3
304#define IP_FW_DUMMYNET 4
305#define IP_FW_NAT 5
306#define IP_FW_ROUTE 6
307
4408d548 308/* ip_fw3_chk controller values */
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309#define IP_FW_CTL_NO 0
310#define IP_FW_CTL_DONE 1
311#define IP_FW_CTL_AGAIN 2
312#define IP_FW_CTL_NEXT 3
313#define IP_FW_CTL_NAT 4
314#define IP_FW_CTL_LOOP 5
315#define IP_FW_CTL_CHK_STATE 6
316
317#define IP_FW_NOT_MATCH 0
318#define IP_FW_MATCH 1
319
320/*
4408d548 321 * arguments for calling ip_fw3_chk() and dummynet_io(). We put them
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322 * all into a structure because this way it is easier and more
323 * efficient to pass variables around and extend the interface.
324 */
325struct ip_fw_args {
326 struct mbuf *m; /* the mbuf chain */
327 struct ifnet *oif; /* output interface */
328 struct ip_fw *rule; /* matching rule */
329 struct ether_header *eh; /* for bridged packets */
330
331 struct ipfw_flow_id f_id; /* grabbed from IP header */
332
333 /*
4408d548 334 * Depend on the return value of ip_fw3_chk/ip_fw_chk_ptr
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335 * 'cookie' field may save following information:
336 *
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337 * IP_FW_DUMMYNET
338 * The pipe or queue number
339 */
340 uint32_t cookie;
341};
342
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343struct ipfw_ioc_rule {
344 uint16_t act_ofs; /* offset of action in 32-bit units */
345 uint16_t cmd_len; /* # of 32-bit words in cmd */
346 uint16_t rulenum; /* rule number */
347 uint8_t set; /* rule set (0..31) */
372a54ac 348 uint8_t insert; /* insert or append */
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349
350 /* Rule set information */
4408d548 351 uint32_t sets; /* disabled rule sets */
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352
353 /* Statistics */
354 uint64_t pcnt; /* Packet counter */
355 uint64_t bcnt; /* Byte counter */
356 uint32_t timestamp; /* tv_sec of last match */
357
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358 ipfw_insn cmd[1]; /* storage for commands */
359};
360
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361#define IOC_RULESIZE(rule) \
362 (sizeof(struct ipfw_ioc_rule) + (rule)->cmd_len * 4 - SIZE_OF_IPFWINSN)
363
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364
365/* IP_FW_X header/opcodes */
366typedef struct _ip_fw_x_header {
367 uint16_t opcode; /* Operation opcode */
368 uint16_t _pad; /* Opcode version */
369} ip_fw_x_header;
370
6a03354e 371/* IP_FW3 opcodes */
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372#define IP_FW_ADD 50 /* add a firewall rule to chain */
373#define IP_FW_DEL 51 /* delete a firewall rule from chain */
374#define IP_FW_FLUSH 52 /* flush firewall rule chain */
375#define IP_FW_ZERO 53 /* clear single/all firewall counter(s) */
376#define IP_FW_GET 54 /* get entire firewall rule chain */
377#define IP_FW_RESETLOG 55 /* reset logging counters */
378
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379#define IP_FW_STATE_ADD 56 /* add one state */
380#define IP_FW_STATE_DEL 57 /* delete states of one rulenum */
381#define IP_FW_STATE_FLUSH 58 /* flush all states */
382#define IP_FW_STATE_GET 59 /* get all states */
383
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384#define IP_DUMMYNET_CONFIGURE 60 /* add/configure a dummynet pipe */
385#define IP_DUMMYNET_DEL 61 /* delete a dummynet pipe from chain */
386#define IP_DUMMYNET_FLUSH 62 /* flush dummynet */
387#define IP_DUMMYNET_GET 64 /* get entire dummynet pipes */
388
389#define IP_FW_MODULE 67 /* get modules names */
390
9187b359 391#define IP_FW_NAT_ADD 68 /* add/config a nat rule */
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392#define IP_FW_NAT_DEL 69 /* delete a nat rule */
393#define IP_FW_NAT_FLUSH 70 /* get configuration of a nat rule */
0fe3a974 394#define IP_FW_NAT_GET 71 /* get config of a nat rule */
9187b359 395#define IP_FW_NAT_GET_RECORD 72 /* get nat record of a nat rule */
105c533e 396
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397#define IP_FW_TABLE_CREATE 73 /* table_create */
398#define IP_FW_TABLE_DELETE 74 /* table_delete */
399#define IP_FW_TABLE_APPEND 75 /* table_append */
400#define IP_FW_TABLE_REMOVE 76 /* table_remove */
401#define IP_FW_TABLE_LIST 77 /* table_list */
402#define IP_FW_TABLE_FLUSH 78 /* table_flush */
403#define IP_FW_TABLE_SHOW 79 /* table_show */
404#define IP_FW_TABLE_TEST 80 /* table_test */
405#define IP_FW_TABLE_RENAME 81 /* rename a table */
406
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407/* opcodes for ipfw3sync */
408#define IP_FW_SYNC_SHOW_CONF 82 /* show sync config */
409#define IP_FW_SYNC_SHOW_STATUS 83 /* show edge & centre running status */
410
411#define IP_FW_SYNC_EDGE_CONF 84 /* config sync edge */
412#define IP_FW_SYNC_EDGE_START 85 /* start the edge */
413#define IP_FW_SYNC_EDGE_STOP 86 /* stop the edge */
414#define IP_FW_SYNC_EDGE_TEST 87 /* test sync edge */
415#define IP_FW_SYNC_EDGE_CLEAR 88 /* stop and clear the edge */
416
417#define IP_FW_SYNC_CENTRE_CONF 89 /* config sync centre */
418#define IP_FW_SYNC_CENTRE_START 90 /* start the centre */
419#define IP_FW_SYNC_CENTRE_STOP 91 /* stop the centre */
420#define IP_FW_SYNC_CENTRE_TEST 92 /* test sync centre */
421#define IP_FW_SYNC_CENTRE_CLEAR 93 /* stop and clear the centre */
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422
423#define IP_FW_SET_GET 95 /* get the set config */
424#define IP_FW_SET_MOVE_RULE 96 /* move a rule to set */
425#define IP_FW_SET_MOVE_SET 97 /* move all rules from set a to b */
426#define IP_FW_SET_SWAP 98 /* swap 2 sets */
427#define IP_FW_SET_TOGGLE 99 /* enable/disable a set */
428#define IP_FW_SET_FLUSH 100 /* flush the rule of the set */
429
430#endif /* _IPFW2_H */
431#ifdef _KERNEL
432
433#include <net/netisr2.h>
434
435int ip_fw3_sockopt(struct sockopt *);
436
437extern int ip_fw3_loaded;
438
439#define IPFW3_LOADED (ip_fw3_loaded)
440
441#ifdef IPFIREWALL3_DEBUG
a111228d 442#define IPFW3_DEBUG1(str) \
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443do { \
444 kprintf(str); \
445} while (0)
a111228d 446#define IPFW3_DEBUG(fmt, ...) \
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447do { \
448 kprintf(fmt, __VA_ARGS__); \
449} while (0)
450#else
a111228d
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451#define IPFW3_DEBUG1(str) ((void)0)
452#define IPFW3_DEBUG(fmt, ...) ((void)0)
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453#endif
454
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455typedef int ip_fw_ctl_t(struct sockopt *);
456typedef int ip_fw_chk_t(struct ip_fw_args *);
457typedef struct mbuf *ip_fw_dn_io_t(struct mbuf *, int, int, struct ip_fw_args *);
458typedef void *ip_fw_log_t(struct mbuf *m, struct ether_header *eh, uint16_t id);
459
460#ifndef _IPFW2_H
461
462int ip_fw_sockopt(struct sockopt *);
463
464struct sockopt;
465struct dn_flow_set;
466
467
468extern ip_fw_chk_t *ip_fw_chk_ptr;
469extern ip_fw_ctl_t *ip_fw_ctl_x_ptr;
470extern ip_fw_dn_io_t *ip_fw_dn_io_ptr;
471
472
473#define IPFW_TABLES_MAX 32
474#define IPFW_USR_F_NORULE 0x01
475#define IPFW_CFGCPUID 0
476#define IPFW_CFGPORT netisr_cpuport(IPFW_CFGCPUID)
477#define IPFW_ASSERT_CFGPORT(msgport) \
478 KASSERT((msgport) == IPFW_CFGPORT, ("not IPFW CFGPORT"))
479
480
481/* root of place holding all information, per-cpu */
482struct ipfw3_context {
483 struct ip_fw *rules; /* rules*/
484 struct ip_fw *default_rule; /* default rule*/
485 struct ipfw3_state_context *state_ctx;
486 struct ipfw3_table_context *table_ctx;
487
488 /* each bit represents a disabled set, 0 is the default set */
489 uint32_t sets;
490};
491#define LEN_FW3_CTX sizeof(struct ipfw3_context)
492
493struct ipfw3_module{
494 int type;
495 int id;
496 char name[20];
497};
498
499
500/*
501 * Definitions for IP option names.
502 */
503#define IP_FW_IPOPT_LSRR 0x01
504#define IP_FW_IPOPT_SSRR 0x02
505#define IP_FW_IPOPT_RR 0x04
506#define IP_FW_IPOPT_TS 0x08
507
508/*
509 * Definitions for TCP option names.
510 */
511#define IP_FW_TCPOPT_MSS 0x01
512#define IP_FW_TCPOPT_WINDOW 0x02
513#define IP_FW_TCPOPT_SACK 0x04
514#define IP_FW_TCPOPT_TS 0x08
515#define IP_FW_TCPOPT_CC 0x10
516
517#define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */
518
519#define MATCH_REVERSE 0
520#define MATCH_FORWARD 1
521#define MATCH_NONE 2
522#define MATCH_UNKNOWN 3
523
524#define L3HDR(T, ip) ((T *)((uint32_t *)(ip) + (ip)->ip_hl))
525
526
527typedef void (*filter_func)(int *cmd_ctl,int *cmd_val,struct ip_fw_args **args,
528 struct ip_fw **f,ipfw_insn *cmd, uint16_t ip_len);
529
530void check_accept(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
531 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
532void check_deny(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
533 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
534
535void ip_fw3_register_module(int module_id,char *module_name);
536int ip_fw3_unregister_module(int module_id);
537void ip_fw3_register_filter_funcs(int module, int opcode, filter_func func);
538void ip_fw3_unregister_filter_funcs(int module,filter_func func);
539
540void init_module(void);
541int ip_fw3_free_rule(struct ip_fw *rule);
542int ip_fw3_chk(struct ip_fw_args *args);
543struct mbuf *ip_fw3_dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa);
544void add_rule_dispatch(netmsg_t nmsg);
545void ip_fw3_add_rule(struct ipfw_ioc_rule *ioc_rule);
546struct ip_fw *ip_fw3_delete_rule(struct ipfw3_context *ctx,
547 struct ip_fw *prev, struct ip_fw *rule);
548void flush_rule_dispatch(netmsg_t nmsg);
549void ip_fw3_ctl_flush_rule(int);
550void delete_rule_dispatch(netmsg_t nmsg);
551int ip_fw3_ctl_delete_rule(struct sockopt *sopt);
552void ip_fw3_clear_counters(struct ip_fw *rule);
553void ip_fw3_zero_entry_dispatch(netmsg_t nmsg);
554int ip_fw3_ctl_zero_entry(int rulenum, int log_only);
555int ip_fw3_ctl_add_rule(struct sockopt *sopt);
556int ip_fw3_ctl_get_modules(struct sockopt *sopt);
557int ip_fw3_ctl_get_rules(struct sockopt *sopt);
558int ip_fw3_ctl_x(struct sockopt *sopt);
559int ip_fw3_ctl(struct sockopt *sopt);
560int ip_fw3_ctl_sockopt(struct sockopt *sopt);
561int ip_fw3_check_in(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir);
562int ip_fw3_check_out(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir);
563void ip_fw3_hook(void);
564void ip_fw3_dehook(void);
565void ip_fw3_sysctl_enable_dispatch(netmsg_t nmsg);
566void ctx_init_dispatch(netmsg_t nmsg);
567void init_dispatch(netmsg_t nmsg);
568int ip_fw3_init(void);
569void fini_dispatch(netmsg_t nmsg);
570int ip_fw3_fini(void);
571
572#endif /* _KERNEL */
573#endif /* _IPFW2_H */
fc6b5ee0 574#endif /* _IP_FW3_H_ */