[PATCH v18 bpf-next 23/23] xdp: disable XDP_REDIRECT for xdp multi-buff

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XDP_REDIRECT is not fully supported yet for xdp multi-buff since not
all XDP capable drivers can map non-linear xdp_frame in ndo_xdp_xmit
so disable it for the moment.

Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
 net/core/filter.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 21a2c47809b5..1de13a790570 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4182,6 +4182,13 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
 	struct bpf_map *map;
 	int err;
 
+	/* XDP_REDIRECT is not fully supported yet for xdp multi-buff since
+	 * not all XDP capable drivers can map non-linear xdp_frame in
+	 * ndo_xdp_xmit.
+	 */
+	if (unlikely(xdp_buff_is_mb(xdp)))
+		return -EOPNOTSUPP;
+
 	ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
 	ri->map_type = BPF_MAP_TYPE_UNSPEC;
 
-- 
2.31.1




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