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/*
* Copyright (C)2003,2004 USAGI/WIDE Project
*
* Header for use in defining a given L3 protocol for connection tracking.
*
* Author:
* Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
*
* Derived from include/netfilter_ipv4/ip_conntrack_protocol.h
*/
#ifndef _NF_CONNTRACK_L3PROTO_H
#define _NF_CONNTRACK_L3PROTO_H
#include <linux/seq_file.h>
#include <net/netfilter/nf_conntrack.h>
struct nfattr;
struct nf_conntrack_l3proto
{
/* L3 Protocol Family number. ex) PF_INET */
u_int16_t l3proto;
/* Protocol name */
const char *name;
/*
* Try to fill in the third arg: nhoff is offset of l3 proto
* hdr. Return true if possible.
*/
int (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int nhoff,
struct nf_conntrack_tuple *tuple);
/*
* Invert the per-proto part of the tuple: ie. turn xmit into reply.
* Some packets can't be inverted: return 0 in that case.
*/
int (*invert_tuple)(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig);
/* Print out the per-protocol part of the tuple. */
int (*print_tuple)(struct seq_file *s,
const struct nf_conntrack_tuple *);
/* Print out the private part of the conntrack. */
int (*print_conntrack)(struct seq_file *s, const struct nf_conn *);
/* Returns verdict for packet, or -1 for invalid. */
int (*packet)(struct nf_conn *conntrack,
const struct sk_buff *skb,
enum ip_conntrack_info ctinfo);
/*
* Called when a new connection for this protocol found;
* returns TRUE if it's OK. If so, packet() called next.
*/
int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb);
/* Called when a conntrack entry is destroyed */
void (*destroy)(struct nf_conn *conntrack);
/*
* Called before tracking.
* *dataoff: offset of protocol header (TCP, UDP,...) in *pskb
* *protonum: protocol number
*/
int (*prepare)(struct sk_buff **pskb, unsigned int hooknum,
unsigned int *dataoff, u_int8_t *protonum);
u_int32_t (*get_features)(const struct nf_conntrack_tuple *tuple);
int (*tuple_to_nfattr)(struct sk_buff *skb,
const struct nf_conntrack_tuple *t);
int (*nfattr_to_tuple)(struct nfattr *tb[],
struct nf_conntrack_tuple *t);
#ifdef CONFIG_SYSCTL
struct ctl_table_header *ctl_table_header;
struct ctl_table *ctl_table_path;
struct ctl_table *ctl_table;
#endif /* CONFIG_SYSCTL */
/* Module (if any) which this is connected to. */
struct module *me;
};
extern struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX];
/* Protocol registration. */
extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
extern struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);
/* Existing built-in protocols */
extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4;
extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6;
extern struct nf_conntrack_l3proto nf_conntrack_l3proto_generic;
static inline struct nf_conntrack_l3proto *
__nf_ct_l3proto_find(u_int16_t l3proto)
{
if (unlikely(l3proto >= AF_MAX))
return &nf_conntrack_l3proto_generic;
return rcu_dereference(nf_ct_l3protos[l3proto]);
}
#endif /*_NF_CONNTRACK_L3PROTO_H*/
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