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/*
* IP Masquerading Modules Support
*
* Version: @(#)ip_masq_mod.h 0.01 97/10/30
*
* Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar>
*
*/
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/ip_fw.h>
#include <linux/proc_fs.h>
#include <net/ip_masq.h>
enum {
IP_MASQ_MOD_NOP,
IP_MASQ_MOD_ACCEPT,
IP_MASQ_MOD_REJECT
};
struct ip_masq_mod {
struct ip_masq_mod *next; /* next mod for addrs. lookups */
struct ip_masq_mod *next_reg; /* next mod for configuration ctls */
char *mmod_name;
atomic_t refcnt;
atomic_t mmod_nent; /* number of entries */
struct proc_dir_entry *mmod_proc_ent;
int (*mmod_ctl) (int optname, struct ip_fw_masqctl *, int optlen);
int (*mmod_init) (void);
int (*mmod_done) (void);
int (*mmod_in_rule) (struct iphdr *, __u16 *);
int (*mmod_in_update) (struct iphdr *, struct ip_masq *);
struct ip_masq * (*mmod_in_create) (struct iphdr *, __u16 *, __u32);
int (*mmod_out_rule) (struct iphdr *, __u16 *);
int (*mmod_out_update) (struct iphdr *, __u16 *, struct ip_masq *);
struct ip_masq * (*mmod_out_create) (struct iphdr *, __u16 *, __u32);
};
/*
* Service routines (called from ip_masq.c)
*/
int ip_masq_mod_out_rule(struct iphdr *iph, __u16 *portp);
int ip_masq_mod_out_update(struct iphdr *iph, __u16 *portp, struct ip_masq *ms);
struct ip_masq * ip_masq_mod_out_create(struct iphdr *iph, __u16 *portp, __u32 maddr);
int ip_masq_mod_in_rule(struct iphdr *iph, __u16 *portp);
int ip_masq_mod_in_update(struct iphdr *iph, __u16 *portp, struct ip_masq *ms);
struct ip_masq * ip_masq_mod_in_create(struct iphdr *iph, __u16 *portp, __u32 maddr);
extern int ip_masq_mod_ctl(int optname, struct ip_fw_masqctl *, int len);
/*
* ip_masq_mod registration functions
*/
extern int register_ip_masq_mod(struct ip_masq_mod *mmod);
extern int unregister_ip_masq_mod(struct ip_masq_mod *mmod);
extern int ip_masq_mod_lkp_unlink(struct ip_masq_mod *mmod);
extern int ip_masq_mod_lkp_link(struct ip_masq_mod *mmod);
/*
* Utility ...
*/
static __inline__ void ip_masq_mod_dec_nent(struct ip_masq_mod *mmod)
{
if (atomic_dec_and_test(&mmod->mmod_nent)) {
ip_masq_mod_lkp_unlink(mmod);
}
}
static __inline__ void ip_masq_mod_inc_nent(struct ip_masq_mod *mmod)
{
atomic_inc(&mmod->mmod_nent);
if (atomic_read(&mmod->mmod_nent)==1)
ip_masq_mod_lkp_link(mmod);
}
#endif /* __KERNEL__ */
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