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author | Tobias Klauser <tklauser@distanz.ch> | 2014-06-04 10:52:53 +0200 |
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committer | Tobias Klauser <tklauser@distanz.ch> | 2014-06-04 10:52:53 +0200 |
commit | edca6174b09d14c75a7bbc25af122a37ff16ecea (patch) | |
tree | a378bbdf9792b774a8d61885569c1df273088204 /update-oui.py | |
parent | 96cbba90a5ccf29c2124b8d4d46ed534861ccf44 (diff) |
dissector: Restore paket type if capturing from nlmon device
The kernel sets the skb pkttype to PACKET_OUTGOING for all packets being
sent through dev_queue_xmit_nit(). However, if capturing packets from an
nlmon device, this causes the information on whether the netlink packet
was sent to kernel- or userspace (PACKET_KERNEL/PACKET_USER) to be
overwritten.
A previous attempt by Daniel Borkmann to fix this in kernel space [1] by
not overwriting the packet type for netlink packets was not regarded as
the proper solution.
[1] http://patchwork.ozlabs.org/patch/338612/
Thus, attempt to fix this in userspace by looking at the pid field of
the netlink packet, which is always 0 for messages to kernel space [2].
[2] http://www.carisma.slowglass.com/~tgr/libnl/doc/core.html#core_netlink_fundamentals
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'update-oui.py')
0 files changed, 0 insertions, 0 deletions