[PATCH net-next 4/4] macsec: Add MACsec rx_handler change support

[Emeel Hakim <ehakim@nvidia.com>]

Offloading device drivers will mark offloaded MACsec SKBs with the
corresponding SCI in the skb_metadata_dst so the macsec rx handler will
know to which interface to divert those skbs, in case of a marked skb
and a mismatch on the dst MAC address, divert the skb to the macsec
net_device where the macsec rx_handler will be called.

Example of such a case is having a MACsec with VLAN as an inner header
ETHERNET | SECTAG | VLAN packet.

Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
---
 drivers/net/macsec.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 25616247d7a5..88b00ea4af68 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1048,6 +1048,15 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
 
 				__netif_rx(nskb);
 			}
+
+			if (md_dst && md_dst->type == METADATA_MACSEC &&
+			    (find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci))) {
+				skb->dev = ndev;
+				skb->pkt_type = PACKET_HOST;
+				ret = RX_HANDLER_ANOTHER;
+				goto out;
+			}
+
 			continue;
 		}
 
-- 
2.21.3