netdev - Re: [PATCH nf-next v3] netfilter: conntrack: skip verification of zero UDP checksum

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Date:   Mon, 9 May 2022 08:06:55 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Kevin Mitchell <kevmitch@...sta.com>
Cc:     gal@...dia.com, Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH nf-next v3] netfilter: conntrack: skip verification of
 zero UDP checksum

On Fri, Apr 29, 2022 at 08:40:27PM -0700, Kevin Mitchell wrote:
> The checksum is optional for UDP packets. However nf_reject would
> previously require a valid checksum to elicit a response such as
> ICMP_DEST_UNREACH.
> 
> Add some logic to nf_reject_verify_csum to determine if a UDP packet has
> a zero checksum and should therefore not be verified.

Applied.