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2019 Jul 24
0
virtio BPF offers incorrect packet length
Hi,
I suspect that the virtio network driver calls some skb BPF programs with
skb->data_end - skb->data != skb->len, but only for forwarded packets.
For instance, the attached sched_cls tc program prints skb->data,
skb->data_end and skb->len for each packet:
<idle>-0 [000] ..s. 491.561727: 0: data: 3110080576
data_end: 3110080704 len: 262
<idle>-0 [000] .Ns. 491.561752: 0: data: 3110080064
data_end: 3110080192 len: 250
As it c...