netdev - Re: [PATCH bpf-next v2 2/3] selftests/bpf: Check dst

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Date:   Mon, 28 Feb 2022 22:25:36 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Jakub Sitnicki <jakub@...udflare.com>
CC:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        <kernel-team@...udflare.com>, Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: Re: [PATCH bpf-next v2 2/3] selftests/bpf: Check dst_port only on
 the client socket

On Sun, Feb 27, 2022 at 09:27:56PM +0100, Jakub Sitnicki wrote:
> cgroup_skb/egress programs which sock_fields test installs process packets
> flying in both directions, from the client to the server, and in reverse
> direction.
> 
> Recently added dst_port check relies on the fact that destination
> port (remote peer port) of the socket which sends the packet is known ahead
> of time. This holds true only for the client socket, which connects to the
> known server port.
> 
> Filter out any traffic that is not bound to be egressing from the client
> socket in the test program for reading the dst_port.
> 
> Fixes: 8f50f16ff39d ("selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads")
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>  .../testing/selftests/bpf/progs/test_sock_fields.c  | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/test_sock_fields.c b/tools/testing/selftests/bpf/progs/test_sock_fields.c
> index 3e2e3ee51cc9..186fed1deaab 100644
> --- a/tools/testing/selftests/bpf/progs/test_sock_fields.c
> +++ b/tools/testing/selftests/bpf/progs/test_sock_fields.c
> @@ -42,6 +42,11 @@ struct {
>  	__type(value, struct bpf_spinlock_cnt);
>  } sk_pkt_out_cnt10 SEC(".maps");
>  
> +enum {
> +	TCP_SYN_SENT = 2,
> +	TCP_LISTEN = 10,
Thanks for the clean up.

A nit. directly use BPF_TCP_SYN_SENT and BPF_TCP_LISTEN.

Others lgtm.

Acked-by: Martin KaFai Lau <kafai@...com>