2 * Copyright (C)2003,2004 USAGI/WIDE Project
4 * Header for use in defining a given L3 protocol for connection tracking.
7 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 * Derived from include/netfilter_ipv4/ip_conntrack_protocol.h
12 #ifndef _NF_CONNTRACK_L3PROTO_H
13 #define _NF_CONNTRACK_L3PROTO_H
14 #include <linux/seq_file.h>
15 #include <net/netfilter/nf_conntrack.h>
19 struct nf_conntrack_l3proto
21 /* L3 Protocol Family number. ex) PF_INET */
28 * Try to fill in the third arg: nhoff is offset of l3 proto
29 * hdr. Return true if possible.
31 int (*pkt_to_tuple
)(const struct sk_buff
*skb
, unsigned int nhoff
,
32 struct nf_conntrack_tuple
*tuple
);
35 * Invert the per-proto part of the tuple: ie. turn xmit into reply.
36 * Some packets can't be inverted: return 0 in that case.
38 int (*invert_tuple
)(struct nf_conntrack_tuple
*inverse
,
39 const struct nf_conntrack_tuple
*orig
);
41 /* Print out the per-protocol part of the tuple. */
42 int (*print_tuple
)(struct seq_file
*s
,
43 const struct nf_conntrack_tuple
*);
46 * Called before tracking.
47 * *dataoff: offset of protocol header (TCP, UDP,...) in *pskb
48 * *protonum: protocol number
50 int (*prepare
)(struct sk_buff
*skb
, unsigned int hooknum
,
51 unsigned int *dataoff
, u_int8_t
*protonum
);
53 u_int32_t (*get_features
)(const struct nf_conntrack_tuple
*tuple
);
55 int (*tuple_to_nfattr
)(struct sk_buff
*skb
,
56 const struct nf_conntrack_tuple
*t
);
58 int (*nfattr_to_tuple
)(struct nfattr
*tb
[],
59 struct nf_conntrack_tuple
*t
);
62 struct ctl_table_header
*ctl_table_header
;
63 struct ctl_table
*ctl_table_path
;
64 struct ctl_table
*ctl_table
;
65 #endif /* CONFIG_SYSCTL */
67 /* Module (if any) which this is connected to. */
71 extern struct nf_conntrack_l3proto
*nf_ct_l3protos
[AF_MAX
];
73 /* Protocol registration. */
74 extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto
*proto
);
75 extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto
*proto
);
76 extern struct nf_conntrack_l3proto
*nf_ct_l3proto_find_get(u_int16_t l3proto
);
77 extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto
*p
);
79 /* Existing built-in protocols */
80 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4
;
81 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6
;
82 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_generic
;
84 static inline struct nf_conntrack_l3proto
*
85 __nf_ct_l3proto_find(u_int16_t l3proto
)
87 if (unlikely(l3proto
>= AF_MAX
))
88 return &nf_conntrack_l3proto_generic
;
89 return rcu_dereference(nf_ct_l3protos
[l3proto
]);
92 #endif /*_NF_CONNTRACK_L3PROTO_H*/