diff --git a/pimd/pim_oil.c b/pimd/pim_oil.c
new file mode 100644
index 0000000..2c8b056
--- /dev/null
+++ b/pimd/pim_oil.c
@@ -0,0 +1,140 @@
+/*
+  PIM for Quagga
+  Copyright (C) 2008  Everton da Silva Marques
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+  
+  You should have received a copy of the GNU General Public License
+  along with this program; see the file COPYING; if not, write to the
+  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+  MA 02110-1301 USA
+  
+  $QuaggaId: $Format:%an, %ai, %h$ $
+*/
+
+#include <zebra.h>
+
+#include "log.h"
+#include "memory.h"
+#include "linklist.h"
+
+#include "pimd.h"
+#include "pim_oil.h"
+#include "pim_str.h"
+#include "pim_iface.h"
+
+void pim_channel_oil_free(struct channel_oil *c_oil)
+{
+  XFREE(MTYPE_PIM_CHANNEL_OIL, c_oil);
+}
+
+static void pim_channel_oil_delete(struct channel_oil *c_oil)
+{
+  /*
+    notice that listnode_delete() can't be moved
+    into pim_channel_oil_free() because the later is
+    called by list_delete_all_node()
+  */
+  listnode_delete(qpim_channel_oil_list, c_oil);
+
+  pim_channel_oil_free(c_oil);
+}
+
+static struct channel_oil *channel_oil_new(struct in_addr group_addr,
+					   struct in_addr source_addr,
+					   int input_vif_index)
+{
+  struct channel_oil *c_oil;
+  struct interface *ifp_in;
+
+  ifp_in = pim_if_find_by_vif_index(input_vif_index);
+  if (!ifp_in) {
+    /* warning only */
+    char group_str[100]; 
+    char source_str[100];
+    pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
+    pim_inet4_dump("<source?>", source_addr, source_str, sizeof(source_str));
+    zlog_warn("%s: (S,G)=(%s,%s) could not find input interface for input_vif_index=%d",
+	      __PRETTY_FUNCTION__,
+	      source_str, group_str, input_vif_index);
+  }
+
+  c_oil = XCALLOC(MTYPE_PIM_CHANNEL_OIL, sizeof(*c_oil));
+  if (!c_oil) {
+    zlog_err("PIM XCALLOC(%d) failure", sizeof(*c_oil));
+    return 0;
+  }
+
+  c_oil->oil.mfcc_mcastgrp = group_addr;
+  c_oil->oil.mfcc_origin   = source_addr;
+  c_oil->oil.mfcc_parent   = input_vif_index;
+  c_oil->oil_ref_count     = 1;
+
+  zassert(c_oil->oil_size == 0);
+
+  return c_oil;
+}
+
+static struct channel_oil *pim_add_channel_oil(struct in_addr group_addr,
+					       struct in_addr source_addr,
+					       int input_vif_index)
+{
+  struct channel_oil *c_oil;
+
+  c_oil = channel_oil_new(group_addr, source_addr, input_vif_index);
+  if (!c_oil) {
+    zlog_warn("PIM XCALLOC(%d) failure", sizeof(*c_oil));
+    return 0;
+  }
+
+  listnode_add(qpim_channel_oil_list, c_oil);
+
+  return c_oil;
+}
+
+static struct channel_oil *pim_find_channel_oil(struct in_addr group_addr,
+						struct in_addr source_addr)
+{
+  struct listnode    *node;
+  struct channel_oil *c_oil;
+
+  for (ALL_LIST_ELEMENTS_RO(qpim_channel_oil_list, node, c_oil)) {
+    if ((group_addr.s_addr == c_oil->oil.mfcc_mcastgrp.s_addr) &&
+	(source_addr.s_addr == c_oil->oil.mfcc_origin.s_addr))
+      return c_oil;
+  }
+  
+  return 0;
+}
+
+struct channel_oil *pim_channel_oil_add(struct in_addr group_addr,
+					struct in_addr source_addr,
+					int input_vif_index)
+{
+  struct channel_oil *c_oil;
+
+  c_oil = pim_find_channel_oil(group_addr, source_addr);
+  if (c_oil) {
+    ++c_oil->oil_ref_count;
+    return c_oil;
+  }
+
+  return pim_add_channel_oil(group_addr, source_addr, input_vif_index);
+}
+
+void pim_channel_oil_del(struct channel_oil *c_oil)
+{
+  --c_oil->oil_ref_count;
+
+  if (c_oil->oil_ref_count < 1) {
+    pim_channel_oil_delete(c_oil);
+  }
+}