taglinefilesource code
max_headroom134drivers/net/new_tunnel.cint      max_headroom;      /* The extra header space needed */
max_headroom228drivers/net/new_tunnel.cmax_headroom = (((tdev->hard_header_len+15)&~15)+tunnel_hlen);
max_headroom232drivers/net/new_tunnel.cprintk("Required room: %d, Tunnel hlen: %d\n", max_headroom, TUNL_HLEN);
max_headroom234drivers/net/new_tunnel.cif (skb_headroom(skb) >= max_headroom) {
max_headroom239drivers/net/new_tunnel.cif ( !(new_skb = dev_alloc_skb(skb->len+max_headroom)) ) 
max_headroom253drivers/net/new_tunnel.cskb_reserve(new_skb, max_headroom);