+/* Call this before modifying an existing packet: ensures it is
+ modifiable and linear to the point you care about (writable_len).
+ Returns true or false. */
+extern int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len);
+
+struct nf_queue_rerouter {
+ void (*save)(const struct sk_buff *skb, struct nf_info *info);
+ int (*reroute)(struct sk_buff **skb, const struct nf_info *info);
+ int rer_size;
+};
+
+#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
+
+extern int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer);
+extern int nf_unregister_queue_rerouter(int pf);
+
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+extern struct proc_dir_entry *proc_net_netfilter;
+#endif
+