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