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#ifndef _XTABLES_H
#define _XTABLES_H
#include <sys/types.h>
#include <linux/netfilter/x_tables.h>
#include <libiptc/libxtc.h>
/* protocol family dependent informations */
struct afinfo {
/* protocol family */
int family;
/* prefix of library name (ex "libipt_" */
char *libprefix;
/* used by setsockopt (ex IPPROTO_IP */
int ipproto;
/* kernel module (ex "ip_tables" */
char *kmod;
/* optname to check revision support of match */
int so_rev_match;
/* optname to check revision support of match */
int so_rev_target;
};
enum xt_tryload {
DONT_LOAD,
DURING_LOAD,
TRY_LOAD,
LOAD_MUST_SUCCEED
};
struct xtables_rule_match
{
struct xtables_rule_match *next;
struct xtables_match *match;
/* Multiple matches of the same type: the ones before
the current one are completed from parsing point of view */
unsigned int completed;
};
/* Include file for additions: new matches and targets. */
struct xtables_match
{
struct xtables_match *next;
xt_chainlabel name;
/* Revision of match (0 by default). */
u_int8_t revision;
u_int16_t family;
const char *version;
/* Size of match data. */
size_t size;
/* Size of match data relevent for userspace comparison purposes */
size_t userspacesize;
/* Function which prints out usage message. */
void (*help)(void);
/* Initialize the match. */
void (*init)(struct xt_entry_match *m, unsigned int *nfcache);
/* Function which parses command options; returns true if it
ate an option */
/* entry is struct ipt_entry for example */
int (*parse)(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
unsigned int *nfcache,
struct xt_entry_match **match);
/* Final check; exit if not ok. */
void (*final_check)(unsigned int flags);
/* Prints out the match iff non-NULL: put space at end */
/* ip is struct ipt_ip * for example */
void (*print)(const void *ip,
const struct xt_entry_match *match, int numeric);
/* Saves the match info in parsable form to stdout. */
/* ip is struct ipt_ip * for example */
void (*save)(const void *ip, const struct xt_entry_match *match);
/* Pointer to list of extra command-line options */
const struct option *extra_opts;
/* Ignore these men behind the curtain: */
unsigned int option_offset;
struct xt_entry_match *m;
unsigned int mflags;
#ifdef NO_SHARED_LIBS
unsigned int loaded; /* simulate loading so options are merged properly */
#endif
};
struct xtables_target
{
struct xtables_target *next;
xt_chainlabel name;
/* Revision of target (0 by default). */
u_int8_t revision;
u_int16_t family;
const char *version;
/* Size of target data. */
size_t size;
/* Size of target data relevent for userspace comparison purposes */
size_t userspacesize;
/* Function which prints out usage message. */
void (*help)(void);
/* Initialize the target. */
void (*init)(struct xt_entry_target *t, unsigned int *nfcache);
/* Function which parses command options; returns true if it
ate an option */
/* entry is struct ipt_entry for example */
int (*parse)(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **targetinfo);
/* Final check; exit if not ok. */
void (*final_check)(unsigned int flags);
/* Prints out the target iff non-NULL: put space at end */
void (*print)(const void *ip,
const struct xt_entry_target *target, int numeric);
/* Saves the targinfo in parsable form to stdout. */
void (*save)(const void *ip,
const struct xt_entry_target *target);
/* Pointer to list of extra command-line options */
struct option *extra_opts;
/* Ignore these men behind the curtain: */
unsigned int option_offset;
struct xt_entry_target *t;
unsigned int tflags;
unsigned int used;
#ifdef NO_SHARED_LIBS
unsigned int loaded; /* simulate loading so options are merged properly */
#endif
};
extern char *lib_dir;
extern void *fw_calloc(size_t count, size_t size);
extern void *fw_malloc(size_t size);
extern const char *modprobe;
extern int xtables_insmod(const char *modname, const char *modprobe, int quiet);
extern int load_xtables_ko(const char *modprobe, int quiet);
/* This is decleared in ip[6]tables.c */
extern struct afinfo afinfo;
/* Keeping track of external matches and targets: linked lists. */
extern struct xtables_match *xtables_matches;
extern struct xtables_target *xtables_targets;
/* Your shared library should call one of these. */
extern void xtables_register_match(struct xtables_match *me);
extern void xtables_register_target(struct xtables_target *me);
extern struct xtables_match *find_match(const char *name, enum xt_tryload,
struct xtables_rule_match **match);
extern struct xtables_target *find_target(const char *name, enum xt_tryload);
#endif /* _XTABLES_H */
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