11300
39%

Ran 14 Oct 2019 06:37PM UTC

Jobs 1

Files 446

Run time 1min

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Committed 14 Oct 2019 06:18PM UTC coverage: 45.532% (-0.03%) from 45.564%

Build # 11300

Build Type

push

travis-ci-com

Committed by

ianvernon

Commit Message

datapath: Fix hairpin flow when ENABLE_ROUTING is disabled

This commit fixes hairpin flows (aka loopback svc) when ENABLE_ROUTING
is disabled.

In the latter case, a packet to self is returned to stack. If the packet
is routed back via the interface it came from (observed with aws-cni in
the CNI-chaining mode), the kernel will drop the packet.

To fix this, we allow the (skb) redirection of such flows.

We could have improved the performance by avoiding the endpoint lookup in
the BPF map for the hairpin flows, but that would require adding more
vars to lxc_config.h and also modifying ipv{4,6}_local_delivery() which
would increase the datapath code complexity (from the readability
perspective).

Signed-off-by: Martynas Pumputis <m@lambda.lt>

Coverage Stats

26085 of 57289 relevant lines covered (45.53%)

1212.94 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	11300.1	14 Oct 2019 06:37PM UTC	0	45.53	Travis Job 11300.1

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