bpf: nodeport: populate ifindex in NAT trace event

This helps to clarify the exact origin of a TO_NETWORK trace event.

Signed-off-by: Julian Wiedmann <jwi@isovalent.com>

bpf/lib/nodeport.h

@@ -1544,7 +1544,7 @@ int tail_handle_snat_fwd_ipv6(struct __ctx_buff *ctx)
 	 * for IPv6, and so it's not possible yet for masqueraded traffic to get
 	 * redirected to another interface
 	 */
-	send_trace_notify6(ctx, obs_point, 0, 0, &saddr, 0, 0,
+	send_trace_notify6(ctx, obs_point, 0, 0, &saddr, 0, NATIVE_DEV_IFINDEX,
 			   trace.reason, trace.monitor);
 
 	return ret;
@@ -1605,8 +1605,8 @@ int tail_handle_nat_fwd_ipv6(struct __ctx_buff *ctx)
 						  CTX_ACT_DROP, METRIC_EGRESS);
 
 	if (ret == CTX_ACT_OK)
-		send_trace_notify(ctx, obs_point, 0, 0, 0, 0, trace.reason,
-				  trace.monitor);
+		send_trace_notify(ctx, obs_point, 0, 0, 0, NATIVE_DEV_IFINDEX,
+				  trace.reason, trace.monitor);
 
 	return ret;
 }
@@ -3100,7 +3100,7 @@ int tail_handle_snat_fwd_ipv4(struct __ctx_buff *ctx)
 	 * the interface to which the egress IP is assigned to.
 	 */
 	if (ret == CTX_ACT_OK)
-		send_trace_notify4(ctx, obs_point, 0, 0, saddr, 0, 0,
+		send_trace_notify4(ctx, obs_point, 0, 0, saddr, 0, NATIVE_DEV_IFINDEX,
 				   trace.reason, trace.monitor);
 
 	return ret;
@@ -3170,8 +3170,8 @@ int tail_handle_nat_fwd_ipv4(struct __ctx_buff *ctx)
 						  CTX_ACT_DROP, METRIC_EGRESS);
 
 	if (ret == CTX_ACT_OK)
-		send_trace_notify(ctx, obs_point, 0, 0, 0, 0, trace.reason,
-				  trace.monitor);
+		send_trace_notify(ctx, obs_point, 0, 0, 0, NATIVE_DEV_IFINDEX,
+				  trace.reason, trace.monitor);
 
 	return ret;
 }