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
|
#ifndef _LIBIPTC_H
#define _LIBIPTC_H
/* Library which manipulates filtering rules. */
#include <linux/types.h>
#include <libiptc/ipt_kernel_headers.h>
#ifdef __cplusplus
# include <climits>
#else
# include <limits.h> /* INT_MAX in ip_tables.h */
#endif
#include <linux/netfilter_ipv4/ip_tables.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef IPT_MIN_ALIGN
/* ipt_entry has pointers and u_int64_t's in it, so if you align to
it, you'll also align to any crazy matches and targets someone
might write */
#define IPT_MIN_ALIGN (__alignof__(struct ipt_entry))
#endif
#define IPT_ALIGN(s) (((s) + ((IPT_MIN_ALIGN)-1)) & ~((IPT_MIN_ALIGN)-1))
struct iptc_handle;
typedef char ipt_chainlabel[32];
#define IPTC_LABEL_ACCEPT "ACCEPT"
#define IPTC_LABEL_DROP "DROP"
#define IPTC_LABEL_QUEUE "QUEUE"
#define IPTC_LABEL_RETURN "RETURN"
/* Does this chain exist? */
int iptc_is_chain(const char *chain, struct iptc_handle *const handle);
/* Take a snapshot of the rules. Returns NULL on error. */
struct iptc_handle *iptc_init(const char *tablename);
/* Cleanup after iptc_init(). */
void iptc_free(struct iptc_handle *h);
/* Iterator functions to run through the chains. Returns NULL at end. */
const char *iptc_first_chain(struct iptc_handle *handle);
const char *iptc_next_chain(struct iptc_handle *handle);
/* Get first rule in the given chain: NULL for empty chain. */
const struct ipt_entry *iptc_first_rule(const char *chain,
struct iptc_handle *handle);
/* Returns NULL when rules run out. */
const struct ipt_entry *iptc_next_rule(const struct ipt_entry *prev,
struct iptc_handle *handle);
/* Returns a pointer to the target name of this entry. */
const char *iptc_get_target(const struct ipt_entry *e,
struct iptc_handle *handle);
/* Is this a built-in chain? */
int iptc_builtin(const char *chain, struct iptc_handle *const handle);
/* Get the policy of a given built-in chain */
const char *iptc_get_policy(const char *chain,
struct ipt_counters *counter,
struct iptc_handle *handle);
/* These functions return TRUE for OK or 0 and set errno. If errno ==
0, it means there was a version error (ie. upgrade libiptc). */
/* Rule numbers start at 1 for the first rule. */
/* Insert the entry `e' in chain `chain' into position `rulenum'. */
int iptc_insert_entry(const ipt_chainlabel chain,
const struct ipt_entry *e,
unsigned int rulenum,
struct iptc_handle *handle);
/* Atomically replace rule `rulenum' in `chain' with `e'. */
int iptc_replace_entry(const ipt_chainlabel chain,
const struct ipt_entry *e,
unsigned int rulenum,
struct iptc_handle *handle);
/* Append entry `e' to chain `chain'. Equivalent to insert with
rulenum = length of chain. */
int iptc_append_entry(const ipt_chainlabel chain,
const struct ipt_entry *e,
struct iptc_handle *handle);
/* Delete the first rule in `chain' which matches `e', subject to
matchmask (array of length == origfw) */
int iptc_delete_entry(const ipt_chainlabel chain,
const struct ipt_entry *origfw,
unsigned char *matchmask,
struct iptc_handle *handle);
/* Delete the rule in position `rulenum' in `chain'. */
int iptc_delete_num_entry(const ipt_chainlabel chain,
unsigned int rulenum,
struct iptc_handle *handle);
/* Check the packet `e' on chain `chain'. Returns the verdict, or
NULL and sets errno. */
const char *iptc_check_packet(const ipt_chainlabel chain,
struct ipt_entry *entry,
struct iptc_handle *handle);
/* Flushes the entries in the given chain (ie. empties chain). */
int iptc_flush_entries(const ipt_chainlabel chain,
struct iptc_handle *handle);
/* Zeroes the counters in a chain. */
int iptc_zero_entries(const ipt_chainlabel chain,
struct iptc_handle *handle);
/* Creates a new chain. */
int iptc_create_chain(const ipt_chainlabel chain,
struct iptc_handle *handle);
/* Deletes a chain. */
int iptc_delete_chain(const ipt_chainlabel chain,
struct iptc_handle *handle);
/* Renames a chain. */
int iptc_rename_chain(const ipt_chainlabel oldname,
const ipt_chainlabel newname,
struct iptc_handle *handle);
/* Sets the policy on a built-in chain. */
int iptc_set_policy(const ipt_chainlabel chain,
const ipt_chainlabel policy,
struct ipt_counters *counters,
struct iptc_handle *handle);
/* Get the number of references to this chain */
int iptc_get_references(unsigned int *ref,
const ipt_chainlabel chain,
struct iptc_handle *handle);
/* read packet and byte counters for a specific rule */
struct ipt_counters *iptc_read_counter(const ipt_chainlabel chain,
unsigned int rulenum,
struct iptc_handle *handle);
/* zero packet and byte counters for a specific rule */
int iptc_zero_counter(const ipt_chainlabel chain,
unsigned int rulenum,
struct iptc_handle *handle);
/* set packet and byte counters for a specific rule */
int iptc_set_counter(const ipt_chainlabel chain,
unsigned int rulenum,
struct ipt_counters *counters,
struct iptc_handle *handle);
/* Makes the actual changes. */
int iptc_commit(struct iptc_handle *handle);
/* Get raw socket. */
int iptc_get_raw_socket(void);
/* Translates errno numbers into more human-readable form than strerror. */
const char *iptc_strerror(int err);
extern void dump_entries(struct iptc_handle *const);
#ifdef __cplusplus
}
#endif
#endif /* _LIBIPTC_H */
|
