skb_availroom(9) centos man page | unix.com

SKB_AVAILROOM(9)						 Linux Networking						  SKB_AVAILROOM(9)

NAME
       skb_availroom - bytes at buffer end

SYNOPSIS
       int skb_availroom(const struct sk_buff * skb);

ARGUMENTS
       skb
	   buffer to check

DESCRIPTION
       Return the number of bytes of free space at the tail of an sk_buff allocated by sk_stream_alloc

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  SKB_AVAILROOM(9)