libip6tc.h revision 14da56743c6cdf25da35b7b5ca7a5d201771990d 
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
15#define ip6tc_handle xtc_handle
16#define ip6t_chainlabel xt_chainlabel
17
18#define IP6TC_LABEL_ACCEPT "ACCEPT"
19#define IP6TC_LABEL_DROP "DROP"
20#define IP6TC_LABEL_QUEUE   "QUEUE"
21#define IP6TC_LABEL_RETURN "RETURN"
22
23/* Does this chain exist? */
24int ip6tc_is_chain(const char *chain, struct xtc_handle *const handle);
25
26/* Take a snapshot of the rules. Returns NULL on error. */
27struct xtc_handle *ip6tc_init(const char *tablename);
28
29/* Cleanup after ip6tc_init(). */
30void ip6tc_free(struct xtc_handle *h);
31
32/* Iterator functions to run through the chains.  Returns NULL at end. */
33const char *ip6tc_first_chain(struct xtc_handle *handle);
34const char *ip6tc_next_chain(struct xtc_handle *handle);
35
36/* Get first rule in the given chain: NULL for empty chain. */
37const struct ip6t_entry *ip6tc_first_rule(const char *chain,
38					  struct xtc_handle *handle);
39
40/* Returns NULL when rules run out. */
41const struct ip6t_entry *ip6tc_next_rule(const struct ip6t_entry *prev,
42					 struct xtc_handle *handle);
43
44/* Returns a pointer to the target name of this position. */
45const char *ip6tc_get_target(const struct ip6t_entry *e,
46			     struct xtc_handle *handle);
47
48/* Is this a built-in chain? */
49int ip6tc_builtin(const char *chain, struct xtc_handle *const handle);
50
51/* Get the policy of a given built-in chain */
52const char *ip6tc_get_policy(const char *chain,
53			     struct xt_counters *counters,
54			     struct xtc_handle *handle);
55
56/* These functions return TRUE for OK or 0 and set errno. If errno ==
57   0, it means there was a version error (ie. upgrade libiptc). */
58/* Rule numbers start at 1 for the first rule. */
59
60/* Insert the entry `fw' in chain `chain' into position `rulenum'. */
61int ip6tc_insert_entry(const xt_chainlabel chain,
62		       const struct ip6t_entry *e,
63		       unsigned int rulenum,
64		       struct xtc_handle *handle);
65
66/* Atomically replace rule `rulenum' in `chain' with `fw'. */
67int ip6tc_replace_entry(const xt_chainlabel chain,
68			const struct ip6t_entry *e,
69			unsigned int rulenum,
70			struct xtc_handle *handle);
71
72/* Append entry `fw' to chain `chain'. Equivalent to insert with
73   rulenum = length of chain. */
74int ip6tc_append_entry(const xt_chainlabel chain,
75		       const struct ip6t_entry *e,
76		       struct xtc_handle *handle);
77
78/* Check whether a matching rule exists */
79int ip6tc_check_entry(const xt_chainlabel chain,
80		       const struct ip6t_entry *origfw,
81		       unsigned char *matchmask,
82		       struct xtc_handle *handle);
83
84/* Delete the first rule in `chain' which matches `fw'. */
85int ip6tc_delete_entry(const xt_chainlabel chain,
86		       const struct ip6t_entry *origfw,
87		       unsigned char *matchmask,
88		       struct xtc_handle *handle);
89
90/* Delete the rule in position `rulenum' in `chain'. */
91int ip6tc_delete_num_entry(const xt_chainlabel chain,
92			   unsigned int rulenum,
93			   struct xtc_handle *handle);
94
95/* Check the packet `fw' on chain `chain'. Returns the verdict, or
96   NULL and sets errno. */
97const char *ip6tc_check_packet(const xt_chainlabel chain,
98			       struct ip6t_entry *,
99			       struct xtc_handle *handle);
100
101/* Flushes the entries in the given chain (ie. empties chain). */
102int ip6tc_flush_entries(const xt_chainlabel chain,
103			struct xtc_handle *handle);
104
105/* Zeroes the counters in a chain. */
106int ip6tc_zero_entries(const xt_chainlabel chain,
107		       struct xtc_handle *handle);
108
109/* Creates a new chain. */
110int ip6tc_create_chain(const xt_chainlabel chain,
111		       struct xtc_handle *handle);
112
113/* Deletes a chain. */
114int ip6tc_delete_chain(const xt_chainlabel chain,
115		       struct xtc_handle *handle);
116
117/* Renames a chain. */
118int ip6tc_rename_chain(const xt_chainlabel oldname,
119		       const xt_chainlabel newname,
120		       struct xtc_handle *handle);
121
122/* Sets the policy on a built-in chain. */
123int ip6tc_set_policy(const xt_chainlabel chain,
124		     const xt_chainlabel policy,
125		     struct xt_counters *counters,
126		     struct xtc_handle *handle);
127
128/* Get the number of references to this chain */
129int ip6tc_get_references(unsigned int *ref, const xt_chainlabel chain,
130			 struct xtc_handle *handle);
131
132/* read packet and byte counters for a specific rule */
133struct xt_counters *ip6tc_read_counter(const xt_chainlabel chain,
134					unsigned int rulenum,
135					struct xtc_handle *handle);
136
137/* zero packet and byte counters for a specific rule */
138int ip6tc_zero_counter(const xt_chainlabel chain,
139		       unsigned int rulenum,
140		       struct xtc_handle *handle);
141
142/* set packet and byte counters for a specific rule */
143int ip6tc_set_counter(const xt_chainlabel chain,
144		      unsigned int rulenum,
145		      struct xt_counters *counters,
146		      struct xtc_handle *handle);
147
148/* Makes the actual changes. */
149int ip6tc_commit(struct xtc_handle *handle);
150
151/* Get raw socket. */
152int ip6tc_get_raw_socket(void);
153
154/* Translates errno numbers into more human-readable form than strerror. */
155const char *ip6tc_strerror(int err);
156
157/* Return prefix length, or -1 if not contiguous */
158int ipv6_prefix_length(const struct in6_addr *a);
159
160extern void dump_entries6(struct xtc_handle *const);
161
162#endif /* _LIBIP6TC_H */
163