pimd: With igmpv2 turned on don't accept 224.0.0.0/24 groups

When a group is in the 224.0.0.0/24 range and we
have igmp v2 turned on do not allow it to be
considered for inclusion as a mroute.

Ticket: CM-13855
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by:

1 files changed, 20 insertions, 0 deletions

diff --git a/pimd/pim_util.c b/pimd/pim_util.c
index 087101e1a2..1b1b5ef8f3 100644
--- a/pimd/pim_util.c
+++ b/pimd/pim_util.c
@@ -107,6 +107,26 @@ void pim_pkt_dump(const char *label, const uint8_t *buf, int size)
 }
 
 int
+pim_is_group_224_0_0_0_24 (struct in_addr group_addr)
+{
+  static int first = 1;
+  static struct prefix group_224;
+  struct prefix group;
+
+  if (first)
+    {
+      str2prefix ("224.0.0.0/24", &group_224);
+      first = 0;
+    }
+
+  group.family = AF_INET;
+  group.u.prefix4 = group_addr;
+  group.prefixlen = 32;
+
+  return prefix_match (&group_224, &group);
+}
+
+int
 pim_is_group_224_4 (struct in_addr group_addr)
 {
   static int first = 1;