dpif-netdev: Handle ECN bits when updating IP checksum.

When recalculating the checksum after a set ToS action, we were
not taking into account the ECN bits copied from the original header.

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index eddd18b..3fa681c 100644 (file)
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -1089,7 +1089,7 @@ dp_netdev_set_nw_tos(struct ofpbuf *packet, struct flow *key,
         uint8_t new = a->nw_tos | (nh->ip_tos & IP_ECN_MASK);
 
         nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t)*field),
-                htons((uint16_t)a->nw_tos));
+                htons((uint16_t) new));
         *field = new;
     }
 }