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23 October 2021, 00:29:24 UTC
Revision 93c647643b48f0131f02e45da3bd367d80443291 authored by Kevin Cernekee on 06 December 2017, 20:12:27 UTC, committed by David S. Miller on 11 December 2017, 16:58:18 UTC 
netlink: Add netns check on taps
 
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@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 2aab6b4
Raw File
Tip revision: 93c647643b48f0131f02e45da3bd367d80443291 authored by Kevin Cernekee on 06 December 2017, 20:12:27 UTC
netlink: Add netns check on taps
Tip revision: 93c6476
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