netdev - Re: [PATCH net-next 09/10] netfilter: get ipv6 pktlen properly in length

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Message-ID: <b0a1bebc-7d44-05bc-347c-94da4cf2ef27@gmail.com>
Date:   Sun, 15 Jan 2023 08:41:36 -0700
From:   David Ahern <dsahern@...il.com>
To:     Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Pravin B Shelar <pshelar@....org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Ilya Maximets <i.maximets@....org>,
        Aaron Conole <aconole@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Paul Moore <paul@...l-moore.com>,
        Guillaume Nault <gnault@...hat.com>
Subject: Re: [PATCH net-next 09/10] netfilter: get ipv6 pktlen properly in
 length_mt6

On 1/13/23 8:31 PM, Xin Long wrote:
> For IPv6 jumbogram packets, the packet size is bigger than 65535,
> it's not right to get it from payload_len and save it to an u16
> variable.
> 
> This patch only fixes it for IPv6 BIG TCP packets, so instead of
> parsing IPV6_TLV_JUMBO exthdr, which is quite some work, it only
> gets the pktlen via 'skb->len - skb_network_offset(skb)' when
> skb_is_gso_v6() and saves it to an u32 variable, similar to IPv4
> BIG TCP packets.
> 
> This fix will also help us add selftest for IPv6 BIG TCP in the
> following patch.
> 

If this is a bug fix for the existing IPv6 support, send it outside of
this set for -net.