nat: fix EI hairpinning thread safety

Avoid doing inter-thread reads without locks by doing a handoff before
destination address rewrite. Destination address is read from a session
which is possibly owned by a different thread. By splitting the work in
two parts with a handoff in the middle, we can do both in a thread safe
way.

Type: improvement
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I1c50d188393a610f5564fa230c75771a8065f273

1 files changed, 1 insertions, 0 deletions

diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index aae999620ac..88637e1d902 100644
--- a/src/vnet/buffer.h
+++ b/src/vnet/buffer.h
@@ -378,6 +378,7 @@ typedef struct
     struct
     {
       u32 flags;
+      u32 required_thread_index;
     } snat;
 
     u32 unused[6];