flow: optionally use pkt recursion for hash #9423
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If a Suricata inline IPS device is routing traffic over a non-encrypted tunnel, like IPv6 tunnels, packets in a flow will be dropped and not be matched. e.g. The following example is a Suricata inline IPS with an IPv6 tunnel: request: IPv4]ICMP] -> |IPS| -> IPv6]IPv4]ICMP] reply: <- |IPS| <- IPv6]IPv4]ICMP] Both the IPv4 request and IPv6 reply will be seen by Suricata on ingress. The flows will not be matched due to flow recursion level. Optionally use pkt recursion level in flow hash. Excluding recursion level in flow hash allows matching of packet flows and defrag on an inline IPS Suricata scenario where the IPS device is a tunnel terminator. Bug: OISF#6260
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I guess you need to update/rebase the referenced suricata-verify Pull Request to the latest master there for CI to get greener here |
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Oops, rebased the surifata-verify PR off the wrong master. I have re-submitted this change, referencing a new suricata-verify PR, over on #9425 Thanks for your comments. |
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If a Suricata inline IPS device is routing traffic over a non-encrypted tunnel, like IPv6 tunnels, packets in a flow will be dropped and not be matched. e.g.
The following example is a Suricata inline IPS with an IPv6 tunnel:
Both the IPv4 request and IPv6 reply will be seen by Suricata on
ingress. The flows will not be matched due to flow recursion level.
Optionally use pkt recursion level in flow hash. Excluding recursion level in flow hash allows matching of packet flows and defrag on an inline IPS Suricata scenario where the IPS device is a tunnel terminator.
Bug: #6260
Make sure these boxes are signed before submitting your Pull Request -- thank you.
Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/6260
Describe changes:
Add config (decoder.recursion-level.use-for-tracking) to control the use of packet recursion level in flow matching. This is to support scenarios where Suricata inline IPS device is routing traffic over a non-encrypted tunnel, like IPv6 tunnels, packets in a flow will be dropped and not be matched. e.g.
The following example is a Suricata inline IPS with an IPv6 tunnel:
request: IPv4]ICMP] -> |IPS| -> IPv6]IPv4]ICMP]
reply: <- |IPS| <- IPv6]IPv4]ICMP]
Both the IPv4 request and IPv6 reply will be seen by Suricata on ingress. The flows will not be matched due to flow recursion level.
Provide values to any of the below to override the defaults.
To use a pull request use a branch name like
pr/NwhereNis thepull request number.
Alternatively,
SV_BRANCHmay also be a link to anOISF/suricata-verify pull-request.
OISF/suricata-verify#1368