From 7c634a2c1c4b4a866faee328d206195e7857d194 Mon Sep 17 00:00:00 2001 From: "/C=JP/ST=JP/CN=Yasuyuki Kozakai/emailAddress=yasuyuki@netfilter.org" Date: Tue, 24 Jul 2007 05:52:07 +0000 Subject: Introduces xtables match/target registration - moves lib_dir to xtables.c - introduces struct pfinfo which has protocol family dependent infomations. - unifies load_ip[6]tables_ko() and moves them as load_xtables_ko() - introduces xt_{match,match_rule,target,tryload} and replaces ip[6]t_* with them - unifies following functions and move them to xtables.c - find_{match,find_target} - compatible_revision, compatible_{match,target}_revision - introduces xtables_register_{match,target} and make register_{match,target}[6] call them. xtables_register_* register ONLY matches/targets matched protocol family Some concepts: - source compatibility for libip[6]t_xxx.c with warning on compilation not binary compatibility. - binary compatibility between 2.4/2.6 kernel and iptables/ip6tables, of cause. - xtables is enough to support only one address family at runtime. Then xtables keeps infomations of only the focused address famiy in struct afinfo. --- include/xtables.h | 173 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 173 insertions(+) (limited to 'include/xtables.h') diff --git a/include/xtables.h b/include/xtables.h index 97395f3..89b92c3 100644 --- a/include/xtables.h +++ b/include/xtables.h @@ -1,10 +1,183 @@ #ifndef _XTABLES_H #define _XTABLES_H +#include +#include +#include + +/* 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 */ -- cgit v1.2.3