GRE: Add ability to configure multipoint mode

Add ability to configure multipoint mode.
Remote IP address in this case has to be 0.0.0.0
Only one tunnel with the same source IP is allowed in the
point-to-multipoint mode

set vpp interfaces gre gre0 mode 'point-to-multipoint'
set vpp interfaces gre gre0 remote '0.0.0.0'
set vpp interfaces gre gre0 source-address '192.0.2.1'

1 files changed, 13 insertions, 3 deletions

diff --git a/python/vyos/vpp/interface/gre.py b/python/vyos/vpp/interface/gre.py
index 65559f294..8f3dbebae 100644
--- a/python/vyos/vpp/interface/gre.py
+++ b/python/vyos/vpp/interface/gre.py
@@ -38,6 +38,7 @@ class GREInterface:
         source_address (str): The source IP address for the GRE tunnel.
         remote (str): The remote IP address for the GRE tunnel.
         tunnel_type (str): The type of GRE tunnel. Defaults to 'l3'.
+        mode (str): The mode of the GRE tunnel. Options are 'point-to-point' and 'point-to-multipoint'. Defaults to 'point-to-point'.
         kernel_interface (str): The associated kernel interface. Defaults to an empty string.
         instance (int): The instance number derived from the interface name.
         vpp (VPPControl): An instance of the VPPControl class for interacting with the VPP API.
@@ -45,9 +46,14 @@ class GREInterface:
 
     # Mapping of tunnel types https://github.com/FDio/vpp/blob/stable/2406/src/plugins/gre/gre.api#L25-L35
     TUNNEL_TYPE_MAP = {
-        "l3": 0,
-        "teb": 1,
-        "erspan": 2,
+        'l3': 0,
+        'teb': 1,
+        'erspan': 2,
+    }
+
+    MODE_MAP = {
+        'point-to-point': 0,
+        'point-to-multipoint': 1,
     }
 
     def __init__(
@@ -56,6 +62,7 @@ class GREInterface:
         source_address,
         remote,
         tunnel_type: str = 'l3',
+        mode: str = 'point-to-point',
         kernel_interface: str = '',
     ):
         """
@@ -65,6 +72,7 @@ class GREInterface:
             ifname (str): The interface name.
             source_address (str): The source IP address for the GRE tunnel.
             remote (str): The remote IP address for the GRE tunnel.
+            mode (str): The mode of the GRE tunnel. Options are 'point-to-point' and 'point-to-multipoint'. Defaults to 'point-to-point'.
             tunnel_type (str): The type of GRE tunnel. Defaults to 'l3'.
             kernel_interface (str): The associated kernel interface. Defaults to an empty string.
         """
@@ -73,6 +81,7 @@ class GREInterface:
         self.src_address = source_address
         self.dst_address = remote
         self.tunnel_type = self.TUNNEL_TYPE_MAP[tunnel_type]
+        self.mode = self.MODE_MAP[mode]
         self.kernel_interface = kernel_interface
         self.vpp = VPPControl()
 
@@ -90,6 +99,7 @@ class GREInterface:
                 'src': self.src_address,
                 'dst': self.dst_address,
                 'instance': self.instance,
+                'mode': self.mode,
                 'type': self.tunnel_type,
             },
         )