1#ifndef _LIBIPTC_H 2#define _LIBIPTC_H 3/* Library which manipulates filtering rules. */ 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 ip_tables.h */ 11#endif 12#include <linux/netfilter_ipv4/ip_tables.h> 13#include <libiptc/xtcshared.h> 14 15#ifdef __cplusplus 16extern "C" { 17#endif 18 19#define iptc_handle xtc_handle 20#define ipt_chainlabel xt_chainlabel 21 22#define IPTC_LABEL_ACCEPT "ACCEPT" 23#define IPTC_LABEL_DROP "DROP" 24#define IPTC_LABEL_QUEUE "QUEUE" 25#define IPTC_LABEL_RETURN "RETURN" 26 27/* Does this chain exist? */ 28int iptc_is_chain(const char *chain, struct xtc_handle *const handle); 29 30/* Take a snapshot of the rules. Returns NULL on error. */ 31struct xtc_handle *iptc_init(const char *tablename); 32 33/* Cleanup after iptc_init(). */ 34void iptc_free(struct xtc_handle *h); 35 36/* Iterator functions to run through the chains. Returns NULL at end. */ 37const char *iptc_first_chain(struct xtc_handle *handle); 38const char *iptc_next_chain(struct xtc_handle *handle); 39 40/* Get first rule in the given chain: NULL for empty chain. */ 41const struct ipt_entry *iptc_first_rule(const char *chain, 42 struct xtc_handle *handle); 43 44/* Returns NULL when rules run out. */ 45const struct ipt_entry *iptc_next_rule(const struct ipt_entry *prev, 46 struct xtc_handle *handle); 47 48/* Returns a pointer to the target name of this entry. */ 49const char *iptc_get_target(const struct ipt_entry *e, 50 struct xtc_handle *handle); 51 52/* Is this a built-in chain? */ 53int iptc_builtin(const char *chain, struct xtc_handle *const handle); 54 55/* Get the policy of a given built-in chain */ 56const char *iptc_get_policy(const char *chain, 57 struct xt_counters *counter, 58 struct xtc_handle *handle); 59 60/* These functions return TRUE for OK or 0 and set errno. If errno == 61 0, it means there was a version error (ie. upgrade libiptc). */ 62/* Rule numbers start at 1 for the first rule. */ 63 64/* Insert the entry `e' in chain `chain' into position `rulenum'. */ 65int iptc_insert_entry(const xt_chainlabel chain, 66 const struct ipt_entry *e, 67 unsigned int rulenum, 68 struct xtc_handle *handle); 69 70/* Atomically replace rule `rulenum' in `chain' with `e'. */ 71int iptc_replace_entry(const xt_chainlabel chain, 72 const struct ipt_entry *e, 73 unsigned int rulenum, 74 struct xtc_handle *handle); 75 76/* Append entry `e' to chain `chain'. Equivalent to insert with 77 rulenum = length of chain. */ 78int iptc_append_entry(const xt_chainlabel chain, 79 const struct ipt_entry *e, 80 struct xtc_handle *handle); 81 82/* Check whether a mathching rule exists */ 83int iptc_check_entry(const xt_chainlabel chain, 84 const struct ipt_entry *origfw, 85 unsigned char *matchmask, 86 struct xtc_handle *handle); 87 88/* Delete the first rule in `chain' which matches `e', subject to 89 matchmask (array of length == origfw) */ 90int iptc_delete_entry(const xt_chainlabel chain, 91 const struct ipt_entry *origfw, 92 unsigned char *matchmask, 93 struct xtc_handle *handle); 94 95/* Delete the rule in position `rulenum' in `chain'. */ 96int iptc_delete_num_entry(const xt_chainlabel chain, 97 unsigned int rulenum, 98 struct xtc_handle *handle); 99 100/* Check the packet `e' on chain `chain'. Returns the verdict, or 101 NULL and sets errno. */ 102const char *iptc_check_packet(const xt_chainlabel chain, 103 struct ipt_entry *entry, 104 struct xtc_handle *handle); 105 106/* Flushes the entries in the given chain (ie. empties chain). */ 107int iptc_flush_entries(const xt_chainlabel chain, 108 struct xtc_handle *handle); 109 110/* Zeroes the counters in a chain. */ 111int iptc_zero_entries(const xt_chainlabel chain, 112 struct xtc_handle *handle); 113 114/* Creates a new chain. */ 115int iptc_create_chain(const xt_chainlabel chain, 116 struct xtc_handle *handle); 117 118/* Deletes a chain. */ 119int iptc_delete_chain(const xt_chainlabel chain, 120 struct xtc_handle *handle); 121 122/* Renames a chain. */ 123int iptc_rename_chain(const xt_chainlabel oldname, 124 const xt_chainlabel newname, 125 struct xtc_handle *handle); 126 127/* Sets the policy on a built-in chain. */ 128int iptc_set_policy(const xt_chainlabel chain, 129 const xt_chainlabel policy, 130 struct xt_counters *counters, 131 struct xtc_handle *handle); 132 133/* Get the number of references to this chain */ 134int iptc_get_references(unsigned int *ref, 135 const xt_chainlabel chain, 136 struct xtc_handle *handle); 137 138/* read packet and byte counters for a specific rule */ 139struct xt_counters *iptc_read_counter(const xt_chainlabel chain, 140 unsigned int rulenum, 141 struct xtc_handle *handle); 142 143/* zero packet and byte counters for a specific rule */ 144int iptc_zero_counter(const xt_chainlabel chain, 145 unsigned int rulenum, 146 struct xtc_handle *handle); 147 148/* set packet and byte counters for a specific rule */ 149int iptc_set_counter(const xt_chainlabel chain, 150 unsigned int rulenum, 151 struct xt_counters *counters, 152 struct xtc_handle *handle); 153 154/* Makes the actual changes. */ 155int iptc_commit(struct xtc_handle *handle); 156 157/* Get raw socket. */ 158int iptc_get_raw_socket(void); 159 160/* Translates errno numbers into more human-readable form than strerror. */ 161const char *iptc_strerror(int err); 162 163extern void dump_entries(struct xtc_handle *const); 164 165extern const struct xtc_ops iptc_ops; 166 167#ifdef __cplusplus 168} 169#endif 170 171 172#endif /* _LIBIPTC_H */ 173