netdev - Re: [PATCH bpf-next v2 1/3] net: Parse IPv6 ext headers from TCP sock

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Message-ID: <20211209180143.6466e43a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 9 Dec 2021 18:01:43 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Mathieu Jadin <mathjadin@...il.com>
Cc:     bpf@...r.kernel.org, KP Singh <kpsingh@...nel.org>,
        netdev@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Joe Stringer <joe@...ium.io>, David Ahern <dsahern@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH bpf-next v2 1/3] net: Parse IPv6 ext headers from TCP
 sock_ops

On Tue,  7 Dec 2021 23:56:33 +0100 Mathieu Jadin wrote:
> Add a flag that, if set, triggers the call of eBPF program for each
> packet holding an IPv6 extension header. Also add a sock_ops operator
> that identifies such call.
> 
> This change uses skb_data and skb_data_end introduced for TCP options'
> parsing but these pointer cover the IPv6 header and its extension
> headers.
> 
> For instance, this change allows to read an eBPF sock_ops program to
> read complex Segment Routing Headers carrying complex messages in TLV or
> observing its intermediate segments as soon as they are received.

Can you share example use cases this opens up?