netdev - Re: [PATCH net-next 7/8] selftests: traceroute: Test traceroute with different source IPs

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Message-ID: <7ceb47ab-81fe-4cde-a829-b7fd50d641a5@kernel.org>
Date: Mon, 1 Sep 2025 20:39:36 -0600
From: David Ahern <dsahern@...nel.org>
To: Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 edumazet@...gle.com, horms@...nel.org, paul@...l-moore.com,
 petrm@...dia.com, linux-security-module@...r.kernel.org
Subject: Re: [PATCH net-next 7/8] selftests: traceroute: Test traceroute with
 different source IPs

On 9/1/25 2:30 AM, Ido Schimmel wrote:
> When generating ICMP error messages, the kernel will prefer a source IP
> that is on the same subnet as the destination IP (see
> inet_select_addr()). Test this behavior by invoking traceroute with
> different source IPs and checking that the ICMP error message is
> generated with a source IP in the same subnet.
> 
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
>  tools/testing/selftests/net/traceroute.sh | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>