netdev - Re: [PATCH v2] selftest/bpf: fix IPV6FR handling in flow dissector

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Date:   Mon, 16 Nov 2020 13:18:10 +0100
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Santucci Pierpaolo <santucci@...genesys.com>
Cc:     shuah@...nel.org, ast@...nel.org, daniel@...earbox.net,
        kafai@...com, songliubraving@...com, yhs@...com, andrii@...nel.org,
        john.fastabend@...il.com, kpsingh@...omium.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2] selftest/bpf: fix IPV6FR handling in flow dissector

On Mon, Nov 16, 2020 at 11:30 AM CET, Santucci Pierpaolo wrote:
> From second fragment on, IPV6FR program must stop the dissection of IPV6
> fragmented packet. This is the same approach used for IPV4 fragmentation.
> This fixes the flow keys calculation for the upper-layer protocols.
> Note that according to RFC8200, the first fragment packet must include
> the upper-layer header.
>
> Signed-off-by: Santucci Pierpaolo <santucci@...genesys.com>
> ---
> v2: extend the commit message, as suggested by John Fastabend
>     <john.fastabend@...il.com>
>
>  tools/testing/selftests/bpf/progs/bpf_flow.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/progs/bpf_flow.c b/tools/testing/selftests/bpf/progs/bpf_flow.c
> index 5a65f6b51377..95a5a0778ed7 100644
> --- a/tools/testing/selftests/bpf/progs/bpf_flow.c
> +++ b/tools/testing/selftests/bpf/progs/bpf_flow.c
> @@ -368,6 +368,8 @@ PROG(IPV6FR)(struct __sk_buff *skb)
>  		 */
>  		if (!(keys->flags & BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG))
>  			return export_flow_keys(keys, BPF_OK);
> +	} else {
> +		return export_flow_keys(keys, BPF_OK);
>  	}
>  
>  	return parse_ipv6_proto(skb, fragh->nexthdr);

Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>