From 4d403bf5d4e4d98f8d4b4810fb0ad3cf18a97f60 Mon Sep 17 00:00:00 2001
From: Marcus Weiner <marcus.weiner@gmail.com>
Date: Mon, 8 Jul 2024 00:07:02 +0200
Subject: [PATCH] Manage static addresses used for GRE

---
 import-dnat.tf              | 34 ++++++++++++++++++++++++++++++++++
 modules/device/variables.tf |  6 ++++++
 modules/device/wan.tf       | 20 ++++++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 import-dnat.tf
 create mode 100644 modules/device/wan.tf

diff --git a/import-dnat.tf b/import-dnat.tf
new file mode 100644
index 0000000..3070e8f
--- /dev/null
+++ b/import-dnat.tf
@@ -0,0 +1,34 @@
+import {
+  to = module.device["R9"].netbox_ip_address.gre_dnat
+  id = 261
+}
+
+import {
+  to = module.device["R10"].netbox_ip_address.gre_dnat
+  id = 294
+}
+
+import {
+  to = module.device["R14"].netbox_ip_address.gre_dnat
+  id = 331
+}
+
+import {
+  to = module.device["R15"].netbox_ip_address.gre_dnat
+  id = 559
+}
+
+import {
+  to = module.device["R18"].netbox_ip_address.gre_dnat
+  id = 643
+}
+
+import {
+  to = module.device["R19"].netbox_ip_address.gre_dnat
+  id = 512
+}
+
+import {
+  to = module.device["R20"].netbox_ip_address.gre_dnat
+  id = 727
+}
diff --git a/modules/device/variables.tf b/modules/device/variables.tf
index 90b8edd..c038ba4 100644
--- a/modules/device/variables.tf
+++ b/modules/device/variables.tf
@@ -77,3 +77,9 @@ variable "tenant_id" {
   description = "NetBox tenant ID to use for all resources"
   default     = 1
 }
+
+variable "gre_dnat_ip" {
+  type        = string
+  description = "Private IP addressed used to receive GRE packets from the CPE"
+  default     = "192.168.178.10/24"
+}
diff --git a/modules/device/wan.tf b/modules/device/wan.tf
new file mode 100644
index 0000000..4d82fcb
--- /dev/null
+++ b/modules/device/wan.tf
@@ -0,0 +1,20 @@
+data "netbox_device_interfaces" "wan" {
+  filter {
+    name  = "device_id"
+    value = var.device_id
+  }
+
+  filter {
+    name  = "name"
+    value = "eth2"
+  }
+}
+
+resource "netbox_ip_address" "gre_dnat" {
+  vrf_id              = netbox_vrf.local.id
+  ip_address          = var.gre_dnat_ip
+  status              = "active"
+  device_interface_id = one(data.netbox_device_interfaces.wan.interfaces).id
+
+  description = "Static Uplink IP (for GRE forwarding) on ${local.location}"
+}