Messages in this thread | | | Subject | Re: [PATCH bpf-next v3] bpf: check for BPF_F_ADJ_ROOM_FIXED_GSO when bpf_skb_change_proto | From | patchwork-bot+netdevbpf@kernel ... | Date | Tue, 18 May 2021 20:10:09 +0000 |
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Hello:
This patch was applied to bpf/bpf-next.git (refs/heads/master):
On Wed, 12 May 2021 16:27:33 +0900 you wrote: > In the forwarding path GRO -> BPF 6 to 4 -> GSO for TCP traffic, the > coalesced packet payload can be > MSS, but < MSS + 20. > bpf_skb_proto_6_to_4 will upgrade the MSS and it can be > the payload > length. After then tcp_gso_segment checks for the payload length if it > is <= MSS. The condition is causing the packet to be dropped. > > tcp_gso_segment(): > [...] > mss = skb_shinfo(skb)->gso_size; > if (unlikely(skb->len <= mss)) > goto out; > [...] > > [...]
Here is the summary with links: - [bpf-next,v3] bpf: check for BPF_F_ADJ_ROOM_FIXED_GSO when bpf_skb_change_proto https://git.kernel.org/bpf/bpf-next/c/fa7b83bf3b15
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