+ /* convert protoinfo to nfnetink attributes */
+ int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
+ const struct ip_conntrack *ct);
+
+ /* convert nfnetlink attributes to protoinfo */
+ int (*from_nfattr)(struct nfattr *tb[], struct ip_conntrack *ct);
+
+ int (*tuple_to_nfattr)(struct sk_buff *skb,
+ const struct ip_conntrack_tuple *t);
+ int (*nfattr_to_tuple)(struct nfattr *tb[],
+ struct ip_conntrack_tuple *t);
+