[strongSwan] understanding make before break flag

[Nalla, Pradeep]

I was using make_before_break feature in recent strongswan version to avoid packet loss during rekey.


In one of our implementation, we have an ipsec dataplane offload hardware. A kernel module is used to intercept the strong swan messages to kernel's SAD/SPD, via PFKEY, for feeding to hardware.


In make_before_break case I see an insertion of SA(new CHILD_SA establishment), updation of policy and delete of SA(old CHILD_SA closing). I want to understand how do you ensure that the packets encrypted using the old CHILD_SA, be processed at the peer successfully before old SAs are deleted?


Thanks

Pradeep.
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