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nft_payload_set_eval
2024 Apr 10
9
[Bug 1744] New: Packet corruption occurs when using the nftables vlan pcp set command
...VLAN PCP value remains unchanged. (See attached
file: 2024-04-09 rx packet.pcapng)
[Analysis]
When receiving packets from the Linux bridge, the VLAN tag is already untagged
and stored in skb->vlan_tci. However, when using the "vlan pcp set" command,
the incorrect offset is obtained in nft_payload_set_eval(), resulting in packet
corruption. To resolve this issue, "vlan pcp set" should set skb->vlan_tci
instead of modifying skb->data.
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