libip6tc.h revision 2325c0fedf7507f94aa3bb11cc65a70d33836f8f 
1#ifndef _LIBIP6TC_H
2#define _LIBIP6TC_H
3/* Library which manipulates firewall rules. Version 0.2. */
4
5#include <linux/types.h>
6#include <libiptc/ipt_kernel_headers.h>
7#ifdef __cplusplus
8#	include <climits>
9#else
10#	include <limits.h> /* INT_MAX in ip6_tables.h */
11#endif
12#include <linux/netfilter_ipv6/ip6_tables.h>
13#include <libiptc/xtcshared.h>
14
15struct ip6tc_handle;
16
17#define ip6t_chainlabel xt_chainlabel
18
19#define IP6TC_LABEL_ACCEPT "ACCEPT"
20#define IP6TC_LABEL_DROP "DROP"
21#define IP6TC_LABEL_QUEUE   "QUEUE"
22#define IP6TC_LABEL_RETURN "RETURN"
23
24/* Does this chain exist? */
25int ip6tc_is_chain(const char *chain, struct ip6tc_handle *const handle);
26
27/* Take a snapshot of the rules. Returns NULL on error. */
28struct ip6tc_handle *ip6tc_init(const char *tablename);
29
30/* Cleanup after ip6tc_init(). */
31void ip6tc_free(struct ip6tc_handle *h);
32
33/* Iterator functions to run through the chains.  Returns NULL at end. */
34const char *ip6tc_first_chain(struct ip6tc_handle *handle);
35const char *ip6tc_next_chain(struct ip6tc_handle *handle);
36
37/* Get first rule in the given chain: NULL for empty chain. */
38const struct ip6t_entry *ip6tc_first_rule(const char *chain,
39					  struct ip6tc_handle *handle);
40
41/* Returns NULL when rules run out. */
42const struct ip6t_entry *ip6tc_next_rule(const struct ip6t_entry *prev,
43					 struct ip6tc_handle *handle);
44
45/* Returns a pointer to the target name of this position. */
46const char *ip6tc_get_target(const struct ip6t_entry *e,
47			     struct ip6tc_handle *handle);
48
49/* Is this a built-in chain? */
50int ip6tc_builtin(const char *chain, struct ip6tc_handle *const handle);
51
52/* Get the policy of a given built-in chain */
53const char *ip6tc_get_policy(const char *chain,
54			     struct ip6t_counters *counters,
55			     struct ip6tc_handle *handle);
56
57/* These functions return TRUE for OK or 0 and set errno. If errno ==
58   0, it means there was a version error (ie. upgrade libiptc). */
59/* Rule numbers start at 1 for the first rule. */
60
61/* Insert the entry `fw' in chain `chain' into position `rulenum'. */
62int ip6tc_insert_entry(const ip6t_chainlabel chain,
63		       const struct ip6t_entry *e,
64		       unsigned int rulenum,
65		       struct ip6tc_handle *handle);
66
67/* Atomically replace rule `rulenum' in `chain' with `fw'. */
68int ip6tc_replace_entry(const ip6t_chainlabel chain,
69			const struct ip6t_entry *e,
70			unsigned int rulenum,
71			struct ip6tc_handle *handle);
72
73/* Append entry `fw' to chain `chain'. Equivalent to insert with
74   rulenum = length of chain. */
75int ip6tc_append_entry(const ip6t_chainlabel chain,
76		       const struct ip6t_entry *e,
77		       struct ip6tc_handle *handle);
78
79/* Check whether a matching rule exists */
80int ip6tc_check_entry(const ip6t_chainlabel chain,
81		       const struct ip6t_entry *origfw,
82		       unsigned char *matchmask,
83		       struct ip6tc_handle *handle);
84
85/* Delete the first rule in `chain' which matches `fw'. */
86int ip6tc_delete_entry(const ip6t_chainlabel chain,
87		       const struct ip6t_entry *origfw,
88		       unsigned char *matchmask,
89		       struct ip6tc_handle *handle);
90
91/* Delete the rule in position `rulenum' in `chain'. */
92int ip6tc_delete_num_entry(const ip6t_chainlabel chain,
93			   unsigned int rulenum,
94			   struct ip6tc_handle *handle);
95
96/* Check the packet `fw' on chain `chain'. Returns the verdict, or
97   NULL and sets errno. */
98const char *ip6tc_check_packet(const ip6t_chainlabel chain,
99			       struct ip6t_entry *,
100			       struct ip6tc_handle *handle);
101
102/* Flushes the entries in the given chain (ie. empties chain). */
103int ip6tc_flush_entries(const ip6t_chainlabel chain,
104			struct ip6tc_handle *handle);
105
106/* Zeroes the counters in a chain. */
107int ip6tc_zero_entries(const ip6t_chainlabel chain,
108		       struct ip6tc_handle *handle);
109
110/* Creates a new chain. */
111int ip6tc_create_chain(const ip6t_chainlabel chain,
112		       struct ip6tc_handle *handle);
113
114/* Deletes a chain. */
115int ip6tc_delete_chain(const ip6t_chainlabel chain,
116		       struct ip6tc_handle *handle);
117
118/* Renames a chain. */
119int ip6tc_rename_chain(const ip6t_chainlabel oldname,
120		       const ip6t_chainlabel newname,
121		       struct ip6tc_handle *handle);
122
123/* Sets the policy on a built-in chain. */
124int ip6tc_set_policy(const ip6t_chainlabel chain,
125		     const ip6t_chainlabel policy,
126		     struct ip6t_counters *counters,
127		     struct ip6tc_handle *handle);
128
129/* Get the number of references to this chain */
130int ip6tc_get_references(unsigned int *ref, const ip6t_chainlabel chain,
131			 struct ip6tc_handle *handle);
132
133/* read packet and byte counters for a specific rule */
134struct ip6t_counters *ip6tc_read_counter(const ip6t_chainlabel chain,
135					unsigned int rulenum,
136					struct ip6tc_handle *handle);
137
138/* zero packet and byte counters for a specific rule */
139int ip6tc_zero_counter(const ip6t_chainlabel chain,
140		       unsigned int rulenum,
141		       struct ip6tc_handle *handle);
142
143/* set packet and byte counters for a specific rule */
144int ip6tc_set_counter(const ip6t_chainlabel chain,
145		      unsigned int rulenum,
146		      struct ip6t_counters *counters,
147		      struct ip6tc_handle *handle);
148
149/* Makes the actual changes. */
150int ip6tc_commit(struct ip6tc_handle *handle);
151
152/* Get raw socket. */
153int ip6tc_get_raw_socket(void);
154
155/* Translates errno numbers into more human-readable form than strerror. */
156const char *ip6tc_strerror(int err);
157
158/* Return prefix length, or -1 if not contiguous */
159int ipv6_prefix_length(const struct in6_addr *a);
160
161extern void dump_entries6(struct ip6tc_handle *const);
162
163#endif /* _LIBIP6TC_H */
164