skb_header_cloned(9) centos man page | unix.com

SKB_HEADER_CLONED(9)						 Linux Networking					      SKB_HEADER_CLONED(9)

NAME
       skb_header_cloned - is the header a clone

SYNOPSIS
       int skb_header_cloned(const struct sk_buff * skb);

ARGUMENTS
       skb
	   buffer to check

DESCRIPTION
       Returns true if modifying the header part of the buffer requires the data to be copied.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      SKB_HEADER_CLONED(9)