linux-kernel - Re: [PATCH V2] netlink: Add netns check on taps

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Date:   Wed, 06 Dec 2017 15:57:14 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     cernekee@...omium.org
Cc:     johannes.berg@...el.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, daniel@...earbox.net,
        dsahern@...il.com
Subject: Re: [PATCH V2] netlink: Add netns check on taps

From: Kevin Cernekee <cernekee@...omium.org>
Date: Wed,  6 Dec 2017 12:12:27 -0800

> Currently, a nlmon link inside a child namespace can observe systemwide
> netlink activity.  Filter the traffic so that nlmon can only sniff
> netlink messages from its own netns.
> 
> Test case:
> 
>     vpnns -- bash -c "ip link add nlmon0 type nlmon; \
>                       ip link set nlmon0 up; \
>                       tcpdump -i nlmon0 -q -w /tmp/nlmon.pcap -U" &
>     sudo ip xfrm state add src 10.1.1.1 dst 10.1.1.2 proto esp \
>         spi 0x1 mode transport \
>         auth sha1 0x6162633132330000000000000000000000000000 \
>         enc aes 0x00000000000000000000000000000000
>     grep --binary abc123 /tmp/nlmon.pcap
> 
> Signed-off-by: Kevin Cernekee <cernekee@...omium.org>

Applied and queued up for -stable, thanks Kevin.