config: Create required interfaces in BNG

Signed-off-by: Shashank D <shashankindiamanoj@gmail.com>

config_util/config.yaml

@@ -0,0 +1,8 @@
+interfaces:
+  - ifname: enp2s0
+    customers:
+      - id: 100
+        outer_vlan: 1000
+        inner_vlan: 400
+        ip_addresses:
+          - 10.0.2.1/32

config_util/config_utility.py

@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import yaml
+import ipaddress
+import pr2modules
+from pyroute2 import IPRoute
+
+
+CONFIG_FILE = "./config.yaml"
+
+with open(CONFIG_FILE) as f:
+    config = yaml.load(f, Loader=yaml.SafeLoader)
+
+
+print(config)
+
+# Create the base interface
+ip = IPRoute()
+
+for iface in config["interfaces"]:
+    if_name = iface["ifname"]
+    print(if_name)
+    for customer in iface["customers"]:
+        inner_vlan_tag = customer["inner_vlan"]
+        outer_vlan_tag = customer["outer_vlan"]
+        base_iface = ip.link_lookup(ifname=if_name)[0]
+        try:
+            ip.link(
+                "add",
+                ifname=f"{if_name}.{inner_vlan_tag}",
+                kind="vlan",
+                link=base_iface,
+                vlan_id=inner_vlan_tag,
+            )
+        except pr2modules.netlink.exceptions.NetlinkError:
+            pass
+
+        # TODO: Check for existing inner tagged iface
+        # TODO: Check if the base iface exists
+        outer_vlan_iface = f"{if_name}.{inner_vlan_tag}.{outer_vlan_tag}"
+        ip.link(
+            "add",
+            ifname=outer_vlan_iface,
+            kind="vlan",
+            link=ip.link_lookup(ifname=f"{if_name}.{inner_vlan_tag}")[0],
+            vlan_id=outer_vlan_tag,
+        )
+        # TODO: Check for existing outer tagged iface
+        for ip_addr_str in customer["ip_addresses"]:
+            ip_addr = ipaddress.ip_interface(ip_addr_str)
+            if ip_addr.version == 4:
+                mask = ip_addr.network.prefixlen
+                ip_str = ip_addr.ip.compressed
+
+                ip.addr(
+                    "add",
+                    index=ip.link_lookup(outer_vlan_iface)[0],
+                    address=ip_str,
+                    mask=mask,
+                )
+# TODO: Handle ipv6
+# TODO: Existing addresses
+
+
+# TODO: Routing (with vlan interface), Attaching ebpf program