[v1.15] egressgw: Let the EGW manager relax rp_filter on egress device #32778
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[ upstream commit 43d65ed ] [ backporter's note: The sysctl Reconciler has not been introduced in v1.15, so the legacy sysctl is used instead. ] Pods running on the Egress GW node fail to communicate with an external endpoint through the Egress GW due to the rp_filter in an environment where egress IP is assigned to a different interface than the one with the default route. The reply packets from the external endpoints are dropped by the rp_filter - A request from a local pod hits eth0 with the default route. It matches an IEGP, gets masqueraded & bpf-redirected to eth1 with Egress IP. - Replies hit eth1, are revSNATed, and passed on to the stack. rp-filter complains that they are received on eth1, when the route doesn't point towards eth1. This PR fixes this issue by relaxing rp_filter on interfaces with Egress IP. Signed-off-by: Yusuke Suzuki <yusuke.suzuki@isovalent.com>
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(added @dylandreimerink for the diff from missing #30439) |
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This is a manual backport of #32679
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