/* SPDX-License-Identifier: GPL-2.0 */

#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>

#include <libiptc/xtcshared.h>

#ifdef __cplusplus

extern "C" {

#endif

#define iptc_handle xtc_handle

#define ipt_chainlabel xt_chainlabel

#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 xtc_handle *const handle);

/* Take a snapshot of the rules.  Returns NULL on error. */

struct xtc_handle *iptc_init(const char *tablename);

/* Cleanup after iptc_init(). */

void iptc_free(struct xtc_handle *h);

/* Iterator functions to run through the chains.  Returns NULL at end. */

const char *iptc_first_chain(struct xtc_handle *handle);

const char *iptc_next_chain(struct xtc_handle *handle);

/* Get first rule in the given chain: NULL for empty chain. */

const struct ipt_entry *iptc_first_rule(const char *chain,

					struct xtc_handle *handle);

/* Returns NULL when rules run out. */

const struct ipt_entry *iptc_next_rule(const struct ipt_entry *prev,

				       struct xtc_handle *handle);

/* Returns a pointer to the target name of this entry. */

const char *iptc_get_target(const struct ipt_entry *e,

			    struct xtc_handle *handle);

/* Is this a built-in chain? */

int iptc_builtin(const char *chain, struct xtc_handle *const handle);

/* Get the policy of a given built-in chain */

const char *iptc_get_policy(const char *chain,

			    struct xt_counters *counter,

			    struct xtc_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 xt_chainlabel chain,

		      const struct ipt_entry *e,

		      unsigned int rulenum,

		      struct xtc_handle *handle);

/* Atomically replace rule `rulenum' in `chain' with `e'. */

int iptc_replace_entry(const xt_chainlabel chain,

		       const struct ipt_entry *e,

		       unsigned int rulenum,

		       struct xtc_handle *handle);

/* Append entry `e' to chain `chain'.  Equivalent to insert with

   rulenum = length of chain. */

int iptc_append_entry(const xt_chainlabel chain,

		      const struct ipt_entry *e,

		      struct xtc_handle *handle);

/* Check whether a mathching rule exists */

int iptc_check_entry(const xt_chainlabel chain,

		      const struct ipt_entry *origfw,

		      unsigned char *matchmask,

		      struct xtc_handle *handle);

/* Delete the first rule in `chain' which matches `e', subject to

   matchmask (array of length == origfw) */

int iptc_delete_entry(const xt_chainlabel chain,

		      const struct ipt_entry *origfw,

		      unsigned char *matchmask,

		      struct xtc_handle *handle);

/* Delete the rule in position `rulenum' in `chain'. */

int iptc_delete_num_entry(const xt_chainlabel chain,

			  unsigned int rulenum,

			  struct xtc_handle *handle);

/* Check the packet `e' on chain `chain'.  Returns the verdict, or

   NULL and sets errno. */

const char *iptc_check_packet(const xt_chainlabel chain,

			      struct ipt_entry *entry,

			      struct xtc_handle *handle);

/* Flushes the entries in the given chain (ie. empties chain). */

int iptc_flush_entries(const xt_chainlabel chain,

		       struct xtc_handle *handle);

/* Zeroes the counters in a chain. */

int iptc_zero_entries(const xt_chainlabel chain,

		      struct xtc_handle *handle);

/* Creates a new chain. */

int iptc_create_chain(const xt_chainlabel chain,

		      struct xtc_handle *handle);

/* Deletes a chain. */

int iptc_delete_chain(const xt_chainlabel chain,

		      struct xtc_handle *handle);

/* Renames a chain. */

int iptc_rename_chain(const xt_chainlabel oldname,

		      const xt_chainlabel newname,

		      struct xtc_handle *handle);

/* Sets the policy on a built-in chain. */

int iptc_set_policy(const xt_chainlabel chain,

		    const xt_chainlabel policy,

		    struct xt_counters *counters,

		    struct xtc_handle *handle);

/* Get the number of references to this chain */

int iptc_get_references(unsigned int *ref,

			const xt_chainlabel chain,

			struct xtc_handle *handle);

/* read packet and byte counters for a specific rule */

struct xt_counters *iptc_read_counter(const xt_chainlabel chain,

				       unsigned int rulenum,

				       struct xtc_handle *handle);

/* zero packet and byte counters for a specific rule */

int iptc_zero_counter(const xt_chainlabel chain,

		      unsigned int rulenum,

		      struct xtc_handle *handle);

/* set packet and byte counters for a specific rule */

int iptc_set_counter(const xt_chainlabel chain,

		     unsigned int rulenum,

		     struct xt_counters *counters,

		     struct xtc_handle *handle);

/* Makes the actual changes. */

int iptc_commit(struct xtc_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 xtc_handle *const);

extern const struct xtc_ops iptc_ops;

#ifdef __cplusplus

}

#endif

#endif /* _LIBIPTC_H */