[PATCH net-next 10/10] xdp: Call skb_metadata_set when skb->data points past metadata

Prepare to copy the XDP metadata into an skb extension in skb_metadata_set.

XDP generic mode runs after MAC header has been already pulled. Adjust
skb->data before calling skb_metadata_set to adhere to new contract.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
 net/core/dev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index c711da335510..f8e5672e835f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c

@@ -5468,8 +5468,11 @@ u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp,
 		break;
 	case XDP_PASS:
 		metalen = xdp->data - xdp->data_meta;
-		if (metalen)
+		if (metalen) {
+			__skb_push(skb, mac_len);
 			skb_metadata_set(skb, metalen);
+			__skb_pull(skb, mac_len);
+		}
 		break;
 	}
 

-- 
2.43.0