1 files changed, 45 insertions, 0 deletions
diff --git a/VNFs/DPPD-PROX/ip_subnet.c b/VNFs/DPPD-PROX/ip_subnet.c
new file mode 100644
index 00000000..dc6ab1ac
--- /dev/null
+++ b/VNFs/DPPD-PROX/ip_subnet.c
@@ -0,0 +1,45 @@
+/*
+// Copyright (c) 2010-2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#include "ip_subnet.h"
+#include "prox_assert.h"
+
+uint32_t ip4_subet_get_n_hosts(const struct ip4_subnet *sn)
+{
+	PROX_ASSERT(sn->prefix <= 32 && sn->prefix >= 1);
+	return 1 << (32 - sn->prefix);
+}
+
+int ip4_subnet_to_host(const struct ip4_subnet *sn, uint32_t host_index, uint32_t *ret_ip)
+{
+	PROX_ASSERT(ip4_subnet_is_valid(sn));
+
+	if (host_index >= ip4_subet_get_n_hosts(sn)) {
+		return -1;
+	}
+
+	*ret_ip = sn->ip + host_index;
+	return 0;
+}
+
+int ip4_subnet_is_valid(const struct ip4_subnet *sn)
+{
+	if (sn->prefix == 0) {
+		return sn->ip == 0;
+	}
+
+	return (sn->ip & ~(((int)(1 << 31)) >> (sn->prefix - 1))) == 0;
+}