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Add a compat wrapper to make modules work with older Linux.

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The extension modules use the API of a fairly recent kernel, if not
even the networking git tree. To make it work with older Linux
kernels, an API wrapper is added. Should compile against
running-kernels Linux 2.6.19..current (tested: 2.6.22..current).

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
This commit is contained in:
Jan Engelhardt
2008-01-29 15:40:57 +01:00
parent 7a981b17b5
commit 47b700b0f5
8 changed files with 343 additions and 7 deletions
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70
extensions/compat_xtnu.h Normal file
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@@ -0,0 +1,70 @@
#ifndef _COMPAT_XTNU_H
#define _COMPAT_XTNU_H 1
#include <linux/list.h>
#include <linux/netfilter/x_tables.h>
#include <linux/spinlock.h>
struct module;
struct net_device;
struct sk_buff;
struct xtnu_match {
struct list_head list;
char name[XT_FUNCTION_MAXNAMELEN - 1 - sizeof(void *)];
bool (*match)(const struct sk_buff *, const struct net_device *,
const struct net_device *, const struct xtnu_match *,
const void *, int, unsigned int, bool *);
bool (*checkentry)(const char *, const void *,
const struct xtnu_match *, void *, unsigned int);
void (*destroy)(const struct xtnu_match *, void *);
struct module *me;
const char *table;
unsigned int matchsize, hooks;
unsigned short proto, family;
uint8_t revision;
void *__compat_match;
};
struct xtnu_target {
struct list_head list;
char name[XT_FUNCTION_MAXNAMELEN - 1 - sizeof(void *)];
unsigned int (*target)(struct sk_buff *, const struct net_device *,
const struct net_device *, unsigned int,
const struct xtnu_target *, const void *);
bool (*checkentry)(const char *, const void *,
const struct xtnu_target *, void *, unsigned int);
void (*destroy)(const struct xtnu_target *, void *);
struct module *me;
const char *table;
unsigned int targetsize, hooks;
unsigned short proto, family;
uint8_t revision;
void *__compat_target;
};
static inline struct xtnu_match *xtcompat_numatch(const struct xt_match *m)
{
void *q;
memcpy(&q, m->name + sizeof(m->name) - sizeof(void *), sizeof(void *));
return q;
}
static inline struct xtnu_target *xtcompat_nutarget(const struct xt_target *t)
{
void *q;
memcpy(&q, t->name + sizeof(t->name) - sizeof(void *), sizeof(void *));
return q;
}
extern int xtnu_ip_route_me_harder(struct sk_buff *, unsigned int);
extern int xtnu_register_match(struct xtnu_match *);
extern void xtnu_unregister_match(struct xtnu_match *);
extern int xtnu_register_matches(struct xtnu_match *, unsigned int);
extern void xtnu_unregister_matches(struct xtnu_match *, unsigned int);
extern int xtnu_register_target(struct xtnu_target *);
extern void xtnu_unregister_target(struct xtnu_target *);
#endif /* _COMPAT_XTNU_H */