IGMP: handle (*,G) report with no source addresses

Change-Id: I363370b9d4a27b992bad55c48fc930a2fbea2165
Signed-off-by: Neale Ranns <nranns@cisco.com>

src/plugins/igmp/igmp_report.c

@@ -32,15 +32,21 @@ igmp_group_mk_source_list (const igmp_membership_group_v3_t * r)
   n = clib_net_to_host_u16 (r->n_src_addresses);
 
   if (0 == n)
-    return (NULL);
-
-  vec_validate (srcs, n - 1);
-  s = r->src_addresses;
-
-  for (ii = 0; ii < n; ii++)
     {
-      srcs[ii].ip4 = *s;
+      /* a (*,G) join has no source address specified */
-      s++;
+      vec_validate (srcs, 0);
+      srcs[0].ip4.as_u32 = 0;
+    }
+  else
+    {
+      vec_validate (srcs, n - 1);
+      s = r->src_addresses;
+
+      for (ii = 0; ii < n; ii++)
+	{
+	  srcs[ii].ip4 = *s;
+	  s++;
+	}
     }
 
   return (srcs);

test/test_igmp.py

@@ -628,6 +628,22 @@ class TestIgmp(VppTestCase):
         self.assertFalse(self.vapi.igmp_dump())
         self.assertFalse(self.vapi.igmp_dump())
 
+        #
+        # A (*,G) host report
+        #
+        p_j = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+               IP(src=self.pg0.remote_ip4, dst="224.0.0.22", tos=0xc0, ttl=1,
+                  options=[IPOption(copy_flag=1, optclass="control",
+                                    option="router_alert")]) /
+               IGMPv3(type="Version 3 Membership Report") /
+               IGMPv3mr(numgrp=1) /
+               IGMPv3gr(rtype="Allow New Sources", maddr="239.1.1.2"))
+
+        self.send(self.pg0, p_j)
+
+        self.assertTrue(wait_for_igmp_event(self, 1, self.pg0,
+                                            "239.1.1.2", "0.0.0.0", 1))
+
         #
         # disable router config
         #