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xdp: Helper function to clear kernel pointers in xdp_frame

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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>
This commit is contained in:
Toshiaki Makita 2018-08-03 16:58:12 +09:00 committed by Daniel Borkmann
parent dc2248220a
commit a8d5b4ab35
1 changed files with 7 additions and 0 deletions
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7
include/net/xdp.h
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@ -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)