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authorPaul Davey2024-04-23 18:00:24 +1200
committerSteffen Klassert2024-04-26 06:44:33 +0200
commit58fbfecab965014b6e3cc956a76b4a96265a1add (patch)
tree90322d489f2949d04e1d545854d1e676fa67d1b8 /tools/iio
parent8b06a24bb625728ac709f2c69405eb01025687e1 (diff)
xfrm: Preserve vlan tags for transport mode software GRO
The software GRO path for esp transport mode uses skb_mac_header_rebuild prior to re-injecting the packet via the xfrm_napi_dev. This only copies skb->mac_len bytes of header which may not be sufficient if the packet contains 802.1Q tags or other VLAN tags. Worse copying only the initial header will leave a packet marked as being VLAN tagged but without the corresponding tag leading to mangling when it is later untagged. The VLAN tags are important when receiving the decrypted esp transport mode packet after GRO processing to ensure it is received on the correct interface. Therefore record the full mac header length in xfrm*_transport_input for later use in corresponding xfrm*_transport_finish to copy the entire mac header when rebuilding the mac header for GRO. The skb->data pointer is left pointing skb->mac_header bytes after the start of the mac header as is expected by the network stack and network and transport header offsets reset to this location. Fixes: 7785bba299a8 ("esp: Add a software GRO codepath") Signed-off-by: Paul Davey <paul.davey@alliedtelesis.co.nz> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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