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From: John Fastabend <john.fastabend@gmail.com>
To: Lorenz Bauer <lmb@cloudflare.com>, Shuah Khan <shuah@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>
Cc: Lorenz Bauer <lmb@cloudflare.com>,
	linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: RE: [PATCH bpf 2/4] selftests: bpf: ignore RST packets for reuseport tests
Date: Fri, 24 Jan 2020 11:45:24 -0800
Message-ID: <5e2b495476333_551b2aaf5fbda5b85d@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <20200123165934.9584-3-lmb@cloudflare.com>

Lorenz Bauer wrote:
> The reuseport tests currently suffer from a race condition: RST
> packets count towards DROP_ERR_SKB_DATA, since they don't contain
> a valid struct cmd. Tests will spuriously fail depending on whether
> check_results is called before or after the RST is processed.
> 
> Exit the BPF program early if FIN is set.
> 
> Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
> ---
>  .../selftests/bpf/progs/test_select_reuseport_kern.c        | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c b/tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c
> index d69a1f2bbbfd..26e77dcc7e91 100644
> --- a/tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c
> +++ b/tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c
> @@ -113,6 +113,12 @@ int _select_by_skb_data(struct sk_reuseport_md *reuse_md)
>  		data_check.skb_ports[0] = th->source;
>  		data_check.skb_ports[1] = th->dest;
>  
> +		if (th->fin)
> +			/* The connection is being torn down at the end of a
> +			 * test. It can't contain a cmd, so return early.
> +			 */
> +			return SK_PASS;
> +
>  		if ((th->doff << 2) + sizeof(*cmd) > data_check.len)
>  			GOTO_DONE(DROP_ERR_SKB_DATA);
>  		if (bpf_skb_load_bytes(reuse_md, th->doff << 2, &cmd_copy,
> -- 
> 2.20.1
> 

Acked-by: John Fastabend <john.fastabend@gmail.com>

  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200123165934.9584-1-lmb@cloudflare.com>
2020-01-23 16:59 ` [PATCH bpf 1/4] selftests: bpf: use a temporary file in test_sockmap Lorenz Bauer
2020-01-23 18:34   ` Martin Lau
2020-01-24 19:50     ` John Fastabend
2020-01-24  9:20   ` Jakub Sitnicki
2020-01-24 19:43   ` John Fastabend
2020-01-23 16:59 ` [PATCH bpf 2/4] selftests: bpf: ignore RST packets for reuseport tests Lorenz Bauer
2020-01-23 17:16   ` Martin Lau
2020-01-23 17:18     ` Lorenz Bauer
2020-01-23 21:53   ` Martin Lau
2020-01-24  9:00     ` Lorenz Bauer
2020-01-24  9:32       ` Daniel Borkmann
2020-01-24 19:45   ` John Fastabend [this message]
2020-01-23 16:59 ` [PATCH bpf 3/4] selftests: bpf: make reuseport test output more legible Lorenz Bauer
2020-01-23 17:26   ` Martin Lau
2020-01-24 19:46   ` John Fastabend
2020-01-23 16:59 ` [PATCH bpf 4/4] selftests: bpf: reset global state between reuseport test runs Lorenz Bauer
2020-01-23 17:56   ` Martin Lau
     [not found] ` <20200124112754.19664-1-lmb@cloudflare.com>
2020-01-24 11:27   ` [PATCH bpf-next v2 1/4] selftests: bpf: use a temporary file in test_sockmap Lorenz Bauer
2020-01-24 11:27   ` [PATCH bpf-next v2 2/4] selftests: bpf: ignore FIN packets for reuseport tests Lorenz Bauer
2020-01-24 11:27   ` [PATCH bpf-next v2 3/4] selftests: bpf: make reuseport test output more legible Lorenz Bauer
2020-01-24 11:27   ` [PATCH bpf-next v2 4/4] selftests: bpf: reset global state between reuseport test runs Lorenz Bauer

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