linux-kernel - Re: [PATCH 2/4] net-next: ip6: fetch inetpeer in ip6frag

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Message-ID: <20220901144810.GA31767@debian>
Date:   Thu, 1 Sep 2022 16:48:47 +0200
From:   Richard Gobert <richardbgobert@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Martin KaFai Lau <kafai@...com>,
        netdev <netdev@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-wpan@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH 2/4] net-next: ip6: fetch inetpeer in ip6frag_init

On Mon, Aug 29, 2022 at 03:20:54PM -0700, Eric Dumazet wrote:
> Sorry, this is adding yet another bottleneck, and will make DDOS
> attacks based on fragments more effective.
> 
> Whole concept of 'peers' based on IPv6 addresses is rather weak, as
> hosts with IPv6 can easily
> get millions of different 'addresses'.

I understand the problem with the implementation. Since peers don't 
carry much weight in IPv6, this patch can be dropped.