summaryrefslogtreecommitdiff
path: root/include/ebtables_u.h
blob: ab615c1d59c449b61425942b38d3b92ed3d395e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
/*
 * $Id: ebtables.c,v 1.03 2002/01/19
 *
 * Copyright (C) 2001-2002 Bart De Schuymer
 *
 *  This code is stongly inspired on the iptables code which is
 *  Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef EBTABLES_U_H
#define EBTABLES_U_H
#include <netinet/in.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter/x_tables.h>

#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP		132
#endif
#ifndef IPPROTO_DCCP
#define IPPROTO_DCCP		33
#endif

#define EXEC_STYLE_PRG		0
#define EXEC_STYLE_DAEMON	1

#ifndef EBT_MIN_ALIGN
#define EBT_MIN_ALIGN (__alignof__(struct _xt_align))
#endif
#define EBT_ALIGN(s) (((s) + (EBT_MIN_ALIGN-1)) & ~(EBT_MIN_ALIGN-1))
#define ERRORMSG_MAXLEN 128

struct ebt_u_entries
{
	int policy;
	unsigned int nentries;
	/* counter offset for this chain */
	unsigned int counter_offset;
	/* used for udc */
	unsigned int hook_mask;
	char *kernel_start;
	char name[EBT_CHAIN_MAXNAMELEN];
	struct ebt_u_entry *entries;
};

struct ebt_cntchanges
{
	unsigned short type;
	unsigned short change; /* determines incremental/decremental/change */
	struct ebt_cntchanges *prev;
	struct ebt_cntchanges *next;
};

#define EBT_ORI_MAX_CHAINS 10
struct ebt_u_replace
{
	char name[EBT_TABLE_MAXNAMELEN];
	unsigned int valid_hooks;
	/* nr of rules in the table */
	unsigned int nentries;
	unsigned int num_chains;
	unsigned int max_chains;
	struct ebt_u_entries **chains;
	/* nr of counters userspace expects back */
	unsigned int num_counters;
	/* where the kernel will put the old counters */
	struct ebt_counter *counters;
	/*
	 * can be used e.g. to know if a standard option
	 * has been specified twice
	 */
	unsigned int flags;
	/* we stick the specified command (e.g. -A) in here */
	char command;
	/*
	 * here we stick the chain to do our thing on (can be -1 if unspecified)
	 */
	int selected_chain;
	/* used for the atomic option */
	char *filename;
	/* tells what happened to the old rules (counter changes) */
	struct ebt_cntchanges *cc;
};

struct ebt_u_table
{
	char name[EBT_TABLE_MAXNAMELEN];
	void (*check)(struct ebt_u_replace *repl);
	void (*help)(const char **);
	struct ebt_u_table *next;
};

struct ebt_u_match_list
{
	struct ebt_u_match_list *next;
	struct ebt_entry_match *m;
};

struct ebt_u_watcher_list
{
	struct ebt_u_watcher_list *next;
	struct ebt_entry_watcher *w;
};

struct ebt_u_entry
{
	unsigned int bitmask;
	unsigned int invflags;
	uint16_t ethproto;
	char in[IFNAMSIZ];
	char logical_in[IFNAMSIZ];
	char out[IFNAMSIZ];
	char logical_out[IFNAMSIZ];
	unsigned char sourcemac[ETH_ALEN];
	unsigned char sourcemsk[ETH_ALEN];
	unsigned char destmac[ETH_ALEN];
	unsigned char destmsk[ETH_ALEN];
	struct ebt_u_match_list *m_list;
	struct ebt_u_watcher_list *w_list;
	struct ebt_entry_target *t;
	struct ebt_u_entry *prev;
	struct ebt_u_entry *next;
	struct ebt_counter cnt;
	struct ebt_counter cnt_surplus; /* for increasing/decreasing a counter and for option 'C' */
	struct ebt_cntchanges *cc;
	/* the standard target needs this to know the name of a udc when
	 * printing out rules. */
	struct ebt_u_replace *replace;
};

struct ebt_u_match
{
	char name[EBT_FUNCTION_MAXNAMELEN];
	/* size of the real match data */
	unsigned int size;
	void (*help)(void);
	void (*init)(struct ebt_entry_match *m);
	int (*parse)(int c, char **argv, int argc,
	        const struct ebt_u_entry *entry, unsigned int *flags,
	        struct ebt_entry_match **match);
	void (*final_check)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_match *match,
	   const char *name, unsigned int hookmask, unsigned int time);
	void (*print)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_match *match);
	int (*compare)(const struct ebt_entry_match *m1,
	   const struct ebt_entry_match *m2);
	const struct option *extra_ops;
	/*
	 * can be used e.g. to check for multiple occurance of the same option
	 */
	unsigned int flags;
	unsigned int option_offset;
	struct ebt_entry_match *m;
	/*
	 * if used == 1 we no longer have to add it to
	 * the match chain of the new entry
	 * be sure to put it back on 0 when finished
	 */
	unsigned int used;
	struct ebt_u_match *next;
};

struct ebt_u_watcher
{
	char name[EBT_FUNCTION_MAXNAMELEN];
	unsigned int size;
	void (*help)(void);
	void (*init)(struct ebt_entry_watcher *w);
	int (*parse)(int c, char **argv, int argc,
	   const struct ebt_u_entry *entry, unsigned int *flags,
	   struct ebt_entry_watcher **watcher);
	void (*final_check)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_watcher *watch, const char *name,
	   unsigned int hookmask, unsigned int time);
	void (*print)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_watcher *watcher);
	int (*compare)(const struct ebt_entry_watcher *w1,
	   const struct ebt_entry_watcher *w2);
	const struct option *extra_ops;
	unsigned int flags;
	unsigned int option_offset;
	struct ebt_entry_watcher *w;
	unsigned int used;
	struct ebt_u_watcher *next;
};

struct ebt_u_target
{
	char name[EBT_FUNCTION_MAXNAMELEN];
	unsigned int size;
	void (*help)(void);
	void (*init)(struct ebt_entry_target *t);
	int (*parse)(int c, char **argv, int argc,
	   const struct ebt_u_entry *entry, unsigned int *flags,
	   struct ebt_entry_target **target);
	void (*final_check)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_target *target, const char *name,
	   unsigned int hookmask, unsigned int time);
	void (*print)(const struct ebt_u_entry *entry,
	   const struct ebt_entry_target *target);
	int (*compare)(const struct ebt_entry_target *t1,
	   const struct ebt_entry_target *t2);
	const struct option *extra_ops;
	unsigned int option_offset;
	unsigned int flags;
	struct ebt_entry_target *t;
	unsigned int used;
	struct ebt_u_target *next;
};

/* libebtc.c */

extern struct ebt_u_table *ebt_tables;
extern struct ebt_u_match *ebt_matches;
extern struct ebt_u_watcher *ebt_watchers;
extern struct ebt_u_target *ebt_targets;

extern int use_lockfd;

void ebt_register_table(struct ebt_u_table *);
void ebt_register_match(struct ebt_u_match *);
void ebt_register_watcher(struct ebt_u_watcher *);
void ebt_register_target(struct ebt_u_target *t);
int ebt_get_kernel_table(struct ebt_u_replace *replace, int init);
struct ebt_u_target *ebt_find_target(const char *name);
struct ebt_u_match *ebt_find_match(const char *name);
struct ebt_u_watcher *ebt_find_watcher(const char *name);
struct ebt_u_table *ebt_find_table(const char *name);
int ebtables_insmod(const char *modname);
void ebt_list_extensions();
void ebt_initialize_entry(struct ebt_u_entry *e);
void ebt_cleanup_replace(struct ebt_u_replace *replace);
void ebt_reinit_extensions();
void ebt_double_chains(struct ebt_u_replace *replace);
void ebt_free_u_entry(struct ebt_u_entry *e);
struct ebt_u_entries *ebt_name_to_chain(const struct ebt_u_replace *replace,
				    const char* arg);
struct ebt_u_entries *ebt_name_to_chain(const struct ebt_u_replace *replace,
				    const char* arg);
int ebt_get_chainnr(const struct ebt_u_replace *replace, const char* arg);
/**/
void ebt_change_policy(struct ebt_u_replace *replace, int policy);
void ebt_flush_chains(struct ebt_u_replace *replace);
int ebt_check_rule_exists(struct ebt_u_replace *replace,
			  struct ebt_u_entry *new_entry);
void ebt_add_rule(struct ebt_u_replace *replace, struct ebt_u_entry *new_entry,
		  int rule_nr);
void ebt_delete_rule(struct ebt_u_replace *replace,
		     struct ebt_u_entry *new_entry, int begin, int end);
void ebt_zero_counters(struct ebt_u_replace *replace);
void ebt_change_counters(struct ebt_u_replace *replace,
		     struct ebt_u_entry *new_entry, int begin, int end,
		     struct ebt_counter *cnt, int mask);
void ebt_new_chain(struct ebt_u_replace *replace, const char *name, int policy);
void ebt_delete_chain(struct ebt_u_replace *replace);
void ebt_rename_chain(struct ebt_u_replace *replace, const char *name);
/**/
void ebt_do_final_checks(struct ebt_u_replace *replace, struct ebt_u_entry *e,
			 struct ebt_u_entries *entries);
int ebt_check_for_references(struct ebt_u_replace *replace, int print_err);
int ebt_check_for_references2(struct ebt_u_replace *replace, int chain_nr,
			      int print_err);
void ebt_check_for_loops(struct ebt_u_replace *replace);
void ebt_add_match(struct ebt_u_entry *new_entry, struct ebt_u_match *m);
void ebt_add_watcher(struct ebt_u_entry *new_entry, struct ebt_u_watcher *w);
void ebt_iterate_matches(void (*f)(struct ebt_u_match *));
void ebt_iterate_watchers(void (*f)(struct ebt_u_watcher *));
void ebt_iterate_targets(void (*f)(struct ebt_u_target *));
void __ebt_print_bug(char *file, int line, char *format, ...);
void __ebt_print_error(char *format, ...);

/* communication.c */

int ebt_get_table(struct ebt_u_replace *repl, int init);
void ebt_deliver_counters(struct ebt_u_replace *repl);
void ebt_deliver_table(struct ebt_u_replace *repl);

/* useful_functions.c */

extern int ebt_invert;
void ebt_check_option(unsigned int *flags, unsigned int mask);
#define ebt_check_inverse(arg) _ebt_check_inverse(arg, argc, argv)
int _ebt_check_inverse(const char option[], int argc, char **argv);
void ebt_print_mac(const unsigned char *mac);
void ebt_print_mac_and_mask(const unsigned char *mac, const unsigned char *mask);
int ebt_get_mac_and_mask(const char *from, unsigned char *to, unsigned char *mask);
void ebt_parse_ip_address(char *address, uint32_t *addr, uint32_t *msk);
char *ebt_mask_to_dotted(uint32_t mask);
void ebt_parse_ip6_address(char *address, struct in6_addr *addr, 
						   struct in6_addr *msk);
char *ebt_ip6_to_numeric(const struct in6_addr *addrp);


int do_command(int argc, char *argv[], int exec_style,
               struct ebt_u_replace *replace_);

struct ethertypeent *parseethertypebynumber(int type);

#define ebt_to_chain(repl)				\
({struct ebt_u_entries *_ch = NULL;			\
if (repl->selected_chain != -1)				\
	_ch = repl->chains[repl->selected_chain];	\
_ch;})
#define ebt_print_bug(format, args...) \
   __ebt_print_bug(__FILE__, __LINE__, format, ##args)
#define ebt_print_error(format,args...) __ebt_print_error(format, ##args);
#define ebt_print_error2(format, args...) do {__ebt_print_error(format, ##args); \
   return -1;} while (0)
#define ebt_check_option2(flags,mask)	\
({ebt_check_option(flags,mask);		\
 if (ebt_errormsg[0] != '\0')		\
	return -1;})
#define ebt_check_inverse2(option)					\
({int __ret = ebt_check_inverse(option);				\
if (ebt_errormsg[0] != '\0')						\
	return -1;							\
if (!optarg) {								\
	__ebt_print_error("Option without (mandatory) argument");	\
	return -1;							\
}									\
__ret;})
#define ebt_print_memory() do {printf("Ebtables: " __FILE__ \
   " %s %d :Out of memory.\n", __FUNCTION__, __LINE__); exit(-1);} while (0)

/* used for keeping the rule counters right during rule adds or deletes */
#define CNT_NORM 	0
#define CNT_DEL 	1
#define CNT_ADD 	2
#define CNT_CHANGE 	3

extern const char *ebt_hooknames[NF_BR_NUMHOOKS];
extern const char *ebt_standard_targets[NUM_STANDARD_TARGETS];
extern char ebt_errormsg[ERRORMSG_MAXLEN];
extern char *ebt_modprobe;
extern int ebt_silent;
extern int ebt_printstyle_mac;

/*
 * Transforms a target string into the right integer,
 * returns 0 on success.
 */
#define FILL_TARGET(_str, _pos) ({                            \
	int _i, _ret = 0;                                     \
	for (_i = 0; _i < NUM_STANDARD_TARGETS; _i++)         \
		if (!strcmp(_str, ebt_standard_targets[_i])) {\
			_pos = -_i - 1;                       \
			break;                                \
		}                                             \
	if (_i == NUM_STANDARD_TARGETS)                       \
		_ret = 1;                                     \
	_ret;                                                 \
})

/* Transforms the target value to an index into standard_targets[] */
#define TARGET_INDEX(_value) (-_value - 1)
/* Returns a target string corresponding to the value */
#define TARGET_NAME(_value) (ebt_standard_targets[TARGET_INDEX(_value)])
/* True if the hook mask denotes that the rule is in a base chain */
#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
/* Clear the bit in the hook_mask that tells if the rule is on a base chain */
#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
#define PRINT_VERSION printf(PROGNAME" v"PROGVERSION" ("PROGDATE")\n")
#ifndef PROC_SYS_MODPROBE
#define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
#endif
#define ATOMIC_ENV_VARIABLE "EBTABLES_ATOMIC_FILE"

#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x)	(sizeof(x) / sizeof((x)[0]))
#endif
#endif /* EBTABLES_U_H */