netdev - Re: [PATCH net v2 1/2] icmp: don't send out ICMP messages with a source address of 0.0.0.0

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Date:   Fri, 18 Jun 2021 19:20:04 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Toke Høiland-Jørgensen <toke@...hat.com>@ci.codeaurora.org
Cc:     davem@...emloft.net, kuba@...nel.org, yoshfuji@...ux-ipv6.org,
        dsahern@...nel.org, netdev@...r.kernel.org, jch@...f.fr
Subject: Re: [PATCH net v2 1/2] icmp: don't send out ICMP messages with a source
 address of 0.0.0.0

Hello:

This series was applied to netdev/net.git (refs/heads/master):

On Fri, 18 Jun 2021 13:04:35 +0200 you wrote:
> When constructing ICMP response messages, the kernel will try to pick a
> suitable source address for the outgoing packet. However, if no IPv4
> addresses are configured on the system at all, this will fail and we end up
> producing an ICMP message with a source address of 0.0.0.0. This can happen
> on a box routing IPv4 traffic via v6 nexthops, for instance.
> 
> Since 0.0.0.0 is not generally routable on the internet, there's a good
> chance that such ICMP messages will never make it back to the sender of the
> original packet that the ICMP message was sent in response to. This, in
> turn, can create connectivity and PMTUd problems for senders. Fortunately,
> RFC7600 reserves a dummy address to be used as a source for ICMP
> messages (192.0.0.8/32), so let's teach the kernel to substitute that
> address as a last resort if the regular source address selection procedure
> fails.
> 
> [...]

Here is the summary with links:
  - [net,v2,1/2] icmp: don't send out ICMP messages with a source address of 0.0.0.0
    https://git.kernel.org/netdev/net/c/321827477360
  - [net,v2,2/2] selftests/net: Add icmp.sh for testing ICMP dummy address responses
    https://git.kernel.org/netdev/net/c/7e9838b7915e

You are awesome, thank you!
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