Test: Add test case for Load Balancer plugin

This adds a basic test for the four existing encap modes
for the load balancer plugin.
- ip4 over gre4
- ip4 over gre6
- ip6 over gre4
- ip6 over gre6

Apparently, scapy does not support GRE and IPv6 combinations.
Hence, those tests do send packets through VPP, but only
ip4 over gre4 output is actually parsed and verified.

Change-Id: I7cedb0f88fd0788ee51b1428ddf9cff7c037511f
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/plugins/lb-plugin/lb/node.c b/plugins/lb-plugin/lb/node.c
index 77beaac9bb2..82f0cb529aa 100644
--- a/plugins/lb-plugin/lb/node.c
+++ b/plugins/lb-plugin/lb/node.c
@@ -48,8 +48,16 @@ format_lb_trace (u8 * s, va_list * args)
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   lb_trace_t *t = va_arg (*args, lb_trace_t *);
-  s = format(s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip, &lbm->vips[t->vip_index]);
-  s = format(s, "lb as[%d]: %U\n", t->as_index, format_lb_as, &lbm->ass[t->as_index]);
+  if (pool_is_free_index(lbm->vips, t->vip_index)) {
+      s = format(s, "lb vip[%d]: This VIP was freed since capture\n");
+  } else {
+      s = format(s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip, &lbm->vips[t->vip_index]);
+  }
+  if (pool_is_free_index(lbm->ass, t->as_index)) {
+      s = format(s, "lb as[%d]: This AS was freed since capture\n");
+  } else {
+      s = format(s, "lb as[%d]: %U\n", t->as_index, format_lb_as, &lbm->ass[t->as_index]);
+  }
   return s;
 }