Commit a8d5b4ab authored Aug 03, 2018 by Toshiaki Makita Committed by Daniel Borkmann Aug 10, 2018

xdp: Helper function to clear kernel pointers in xdp_frame

xdp_frame has kernel pointers which should not be readable from bpf
programs. When we want to reuse xdp_frame region but it may be read by
bpf programs later, we can use this helper to clear kernel pointers.
This is more efficient than calling memset() for the entire struct.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent dc224822

include/net/xdp.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -84,6 +84,13 @@ struct xdp_frame {
		struct net_device dev_rx; / used by cpumap */
		};

		/* Clear kernel pointers in xdp_frame */
		static inline void xdp_scrub_frame(struct xdp_frame *frame)
		{
		frame->data = NULL;
		frame->dev_rx = NULL;
		}

		/* Convert xdp_buff to xdp_frame */
		static inline
		struct xdp_frame convert_to_xdp_frame(struct xdp_buff xdp)