Support matching and modifying IP TTL.

[sliver-openvswitch.git] / lib / dpif-netdev.c

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index d776899..27125d3 100644 (file)
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -1091,6 +1091,16 @@ dp_netdev_set_ip_tos(struct ip_header *nh, uint8_t new_tos)
     *field = new_tos;
 }
 
+static void
+dp_netdev_set_ip_ttl(struct ip_header *nh, uint8_t new_ttl)
+{
+    uint8_t *field = &nh->ip_ttl;
+
+    nh->ip_csum = recalc_csum16(nh->ip_csum, htons(*field << 8),
+                                   htons(new_ttl << 8));
+    *field = new_ttl;
+}
+
 static void
 dp_netdev_set_ipv4(struct ofpbuf *packet, const struct ovs_key_ipv4 *ipv4_key)
 {
@@ -1105,6 +1115,9 @@ dp_netdev_set_ipv4(struct ofpbuf *packet, const struct ovs_key_ipv4 *ipv4_key)
     if (nh->ip_tos != ipv4_key->ipv4_tos) {
         dp_netdev_set_ip_tos(nh, ipv4_key->ipv4_tos);
     }
+    if (nh->ip_ttl != ipv4_key->ipv4_ttl) {
+        dp_netdev_set_ip_ttl(nh, ipv4_key->ipv4_ttl);
+    }
 }
 
 static void