linux-kernel - Re: [PATCH v6 1/2] net: fix wrong network header length

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Date:   Mon, 09 May 2022 10:00:12 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Lina Wang <lina.wang@...iatek.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        shuah@...nel.org, matthias.bgg@...il.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, hawk@...nel.org,
        nathan@...nel.org, ndesaulniers@...gle.com, edumazet@...gle.com,
        willemb@...gle.com, maze@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        bpf@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v6 1/2] net: fix wrong network header length

Hello:

This series was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Thu, 5 May 2022 13:48:49 +0800 you wrote:
> When clatd starts with ebpf offloaing, and NETIF_F_GRO_FRAGLIST is enable,
> several skbs are gathered in skb_shinfo(skb)->frag_list. The first skb's
> ipv6 header will be changed to ipv4 after bpf_skb_proto_6_to_4,
> network_header\transport_header\mac_header have been updated as ipv4 acts,
> but other skbs in frag_list didnot update anything, just ipv6 packets.
> 
> udp_queue_rcv_skb will call skb_segment_list to traverse other skbs in
> frag_list and make sure right udp payload is delivered to user space.
> Unfortunately, other skbs in frag_list who are still ipv6 packets are
> updated like the first skb and will have wrong transport header length.
> 
> [...]

Here is the summary with links:
  - [v6,1/2] net: fix wrong network header length
    https://git.kernel.org/netdev/net/c/cf3ab8d4a797
  - [v6,2/2] selftests net: add UDP GRO fraglist + bpf self-tests
    (no matching commit)

You are awesome, thank you!
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