netdev - Re: [PATCH net] ip: report the original address of ICMP messages

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Date:	Tue, 23 Jun 2015 21:55:13 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Willem de Bruijn <willemb@...gle.com>
cc:	David Miller <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net] ip: report the original address of ICMP messages


	Hello,

On Tue, 23 Jun 2015, Willem de Bruijn wrote:

> The ping utility from iputils relies on cmsg IP_RECVERR to get
> the source address on icmp errors, not on msg_name, so that
> worked for me both before and after applying the patch. I used
> `ping -t 2 $hostname` to trigger a TTL exceeded. Perhaps you used
> a different tool or test? In any case, the change looks fine to me.
> Thanks for preparing the patch.


# rpm -qf `which ping`
iputils-20140519-1.fc20.i686

	It is using IP_RECVERR and may be relying only on
original address returned in msg_name from MSG_ERRQUEUE.
May be it ignores the error if original address is missing
or is different.

	I didn't checked the ping source but I noticed that
it does not print anything on the read from raw socket, only
on IP_RECVERR. I noticed it when my network connection
failed. The incoming ICMP packet from my router was
DEST_UNREACH(type=3), HOST_UNREACH(code=1) but simple
REJECT rule in OUTPUT can do the same.

Regards

--
Julian Anastasov <ja@....bg>
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