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#ifndef _LIBIPTC_H
#define _LIBIPTC_H
/* Library which manipulates filtering rules. */
#include <linux/types.h>
#include <libiptc/ipt_kernel_headers.h>
#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))
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"
/* Transparent handle type. */
typedef struct iptc_handle *iptc_handle_t;
/* Does this chain exist? */
int iptc_is_chain(const char *chain, const iptc_handle_t handle);
/* Take a snapshot of the rules. Returns NULL on error. */
iptc_handle_t iptc_init(const char *tablename);
/* Cleanup after iptc_init(). */
void iptc_free(iptc_handle_t *h);
/* Iterator functions to run through the chains. Returns NULL at end. */
const char *iptc_first_chain(iptc_handle_t *handle);
const char *iptc_next_chain(iptc_handle_t *handle);
/* Get first rule in the given chain: NULL for empty chain. */
const struct ipt_entry *iptc_first_rule(const char *chain,
iptc_handle_t *handle);
/* Returns NULL when rules run out. */
const struct ipt_entry *iptc_next_rule(const struct ipt_entry *prev,
iptc_handle_t *handle);
/* Returns a pointer to the target name of this entry. */
const char *iptc_get_target(const struct ipt_entry *e,
iptc_handle_t *handle);
/* Is this a built-in chain? */
int iptc_builtin(const char *chain, const iptc_handle_t handle);
/* Get the policy of a given built-in chain */
const char *iptc_get_policy(const char *chain,
struct ipt_counters *counter,
iptc_handle_t *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,
iptc_handle_t *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,
iptc_handle_t *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,
iptc_handle_t *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,
iptc_handle_t *handle);
/* Delete the rule in position `rulenum' in `chain'. */
int iptc_delete_num_entry(const ipt_chainlabel chain,
unsigned int rulenum,
iptc_handle_t *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,
iptc_handle_t *handle);
/* Flushes the entries in the given chain (ie. empties chain). */
int iptc_flush_entries(const ipt_chainlabel chain,
iptc_handle_t *handle);
/* Zeroes the counters in a chain. */
int iptc_zero_entries(const ipt_chainlabel chain,
iptc_handle_t *handle);
/* Creates a new chain. */
int iptc_create_chain(const ipt_chainlabel chain,
iptc_handle_t *handle);
/* Deletes a chain. */
int iptc_delete_chain(const ipt_chainlabel chain,
iptc_handle_t *handle);
/* Renames a chain. */
int iptc_rename_chain(const ipt_chainlabel oldname,
const ipt_chainlabel newname,
iptc_handle_t *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,
iptc_handle_t *handle);
/* Get the number of references to this chain */
int iptc_get_references(unsigned int *ref,
const ipt_chainlabel chain,
iptc_handle_t *handle);
/* read packet and byte counters for a specific rule */
struct ipt_counters *iptc_read_counter(const ipt_chainlabel chain,
unsigned int rulenum,
iptc_handle_t *handle);
/* zero packet and byte counters for a specific rule */
int iptc_zero_counter(const ipt_chainlabel chain,
unsigned int rulenum,
iptc_handle_t *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,
iptc_handle_t *handle);
/* Makes the actual changes. */
int iptc_commit(iptc_handle_t *handle);
/* Get raw socket. */
int iptc_get_raw_socket();
/* Translates errno numbers into more human-readable form than strerror. */
const char *iptc_strerror(int err);
#ifdef __cplusplus
}
#endif
#endif /* _LIBIPTC_H */
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