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Date:   Wed, 27 Feb 2019 16:18:12 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, oss-drivers@...ronome.com
Subject: Re: [PATCH bpf-next 1/5] samples: bpf: force IPv4 in ping

On Wed, Feb 27, 2019 at 3:31 PM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> ping localhost may default of IPv6 on modern systems, but
> samples are trying to only parse IPv4.  Force IPv4.
>
> samples/bpf/tracex1_user.c doesn't interpret the packet so
> we don't care which IP version will be used there.
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

Acked-by: Andrii Nakryiko <andriin@...com>

> ---
>  samples/bpf/sock_example.c | 2 +-
>  samples/bpf/sockex1_user.c | 2 +-
>  samples/bpf/sockex2_user.c | 2 +-
>  samples/bpf/sockex3_user.c | 2 +-
>  samples/bpf/tracex2_user.c | 2 +-
>  5 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/samples/bpf/sock_example.c b/samples/bpf/sock_example.c
> index 60ec467c78ab..00aae1d33fca 100644
> --- a/samples/bpf/sock_example.c
> +++ b/samples/bpf/sock_example.c
> @@ -99,7 +99,7 @@ int main(void)
>  {
>         FILE *f;
>
> -       f = popen("ping -c5 localhost", "r");
> +       f = popen("ping -4 -c5 localhost", "r");
>         (void)f;
>
>         return test_sock();
> diff --git a/samples/bpf/sockex1_user.c b/samples/bpf/sockex1_user.c
> index 93ec01c56104..be8ba5686924 100644
> --- a/samples/bpf/sockex1_user.c
> +++ b/samples/bpf/sockex1_user.c
> @@ -26,7 +26,7 @@ int main(int ac, char **argv)
>         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
>                           sizeof(prog_fd[0])) == 0);
>
> -       f = popen("ping -c5 localhost", "r");
> +       f = popen("ping -4 -c5 localhost", "r");
>         (void) f;
>
>         for (i = 0; i < 5; i++) {
> diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c
> index 1d5c6e9a6d27..125ee6efc913 100644
> --- a/samples/bpf/sockex2_user.c
> +++ b/samples/bpf/sockex2_user.c
> @@ -34,7 +34,7 @@ int main(int ac, char **argv)
>         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
>                           sizeof(prog_fd[0])) == 0);
>
> -       f = popen("ping -c5 localhost", "r");
> +       f = popen("ping -4 -c5 localhost", "r");
>         (void) f;
>
>         for (i = 0; i < 5; i++) {
> diff --git a/samples/bpf/sockex3_user.c b/samples/bpf/sockex3_user.c
> index 9d02e0404719..bbb1cd0666a9 100644
> --- a/samples/bpf/sockex3_user.c
> +++ b/samples/bpf/sockex3_user.c
> @@ -58,7 +58,7 @@ int main(int argc, char **argv)
>                           sizeof(__u32)) == 0);
>
>         if (argc > 1)
> -               f = popen("ping -c5 localhost", "r");
> +               f = popen("ping -4 -c5 localhost", "r");
>         else
>                 f = popen("netperf -l 4 localhost", "r");
>         (void) f;
> diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c
> index 1a81e6a5c2ea..c9544a4ce61a 100644
> --- a/samples/bpf/tracex2_user.c
> +++ b/samples/bpf/tracex2_user.c
> @@ -131,7 +131,7 @@ int main(int ac, char **argv)
>         signal(SIGTERM, int_exit);
>
>         /* start 'ping' in the background to have some kfree_skb events */
> -       f = popen("ping -c5 localhost", "r");
> +       f = popen("ping -4 -c5 localhost", "r");
>         (void) f;
>
>         /* start 'dd' in the background to have plenty of 'write' syscalls */
> --
> 2.19.2
>

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