vpp: T8355: Set MTU for vpp interfaces

16 files changed, 124 insertions, 3 deletions

diff --git a/interface-definitions/vpp_interface_bonding.xml.in b/interface-definitions/vpp_interface_bonding.xml.in
index 9f114d157..78166e306 100644
--- a/interface-definitions/vpp_interface_bonding.xml.in
+++ b/interface-definitions/vpp_interface_bonding.xml.in
@@ -108,6 +108,9 @@
               </node>
               #include <include/interface/address-ipv4-ipv6.xml.i>
               #include <include/interface/mtu-68-16000.xml.i>
+              <leafNode name="mtu">
+                <defaultValue>1500</defaultValue>
+              </leafNode>
               #include <include/vpp/vif.xml.i>
             </children>
           </tagNode>
diff --git a/interface-definitions/vpp_interface_gre.xml.in b/interface-definitions/vpp_interface_gre.xml.in
index 0ac3fdf1f..a0228420a 100644
--- a/interface-definitions/vpp_interface_gre.xml.in
+++ b/interface-definitions/vpp_interface_gre.xml.in
@@ -76,6 +76,9 @@
               #include <include/interface/tunnel-remote.xml.i>
               #include <include/interface/address-ipv4-ipv6.xml.i>
               #include <include/interface/mtu-68-16000.xml.i>
+              <leafNode name="mtu">
+                <defaultValue>1476</defaultValue>
+              </leafNode>
             </children>
           </tagNode>
         </children>
diff --git a/interface-definitions/vpp_interface_ipip.xml.in b/interface-definitions/vpp_interface_ipip.xml.in
index c965c531c..a214f728e 100644
--- a/interface-definitions/vpp_interface_ipip.xml.in
+++ b/interface-definitions/vpp_interface_ipip.xml.in
@@ -24,6 +24,9 @@
               #include <include/interface/tunnel-remote.xml.i>
               #include <include/interface/address-ipv4-ipv6.xml.i>
               #include <include/interface/mtu-68-16000.xml.i>
+              <leafNode name="mtu">
+                <defaultValue>1476</defaultValue>
+              </leafNode>
             </children>
           </tagNode>
         </children>
diff --git a/interface-definitions/vpp_interface_vxlan.xml.in b/interface-definitions/vpp_interface_vxlan.xml.in
index 9ba90e2a0..1de141b1e 100644
--- a/interface-definitions/vpp_interface_vxlan.xml.in
+++ b/interface-definitions/vpp_interface_vxlan.xml.in
@@ -25,6 +25,9 @@
               #include <include/vni.xml.i>
               #include <include/interface/address-ipv4-ipv6.xml.i>
               #include <include/interface/mtu-68-16000.xml.i>
+              <leafNode name="mtu">
+                <defaultValue>1450</defaultValue>
+              </leafNode>
             </children>
           </tagNode>
         </children>
diff --git a/python/vyos/ifconfig/vpp/bond.py b/python/vyos/ifconfig/vpp/bond.py
index 75849a620..a1c6f2ef3 100644
--- a/python/vyos/ifconfig/vpp/bond.py
+++ b/python/vyos/ifconfig/vpp/bond.py
@@ -148,5 +148,8 @@ class VPPBondInterface(Interface, VPPInterface):
         if rx_mode:
             self.set_rx_mode(rx_mode)
 
+        # Apply VPP-specific interface settings
+        VPPInterface.update(self, config)
+
         # Apply all settings to the lcp pair (kernel) interface
         super().update(config)
diff --git a/python/vyos/ifconfig/vpp/gre.py b/python/vyos/ifconfig/vpp/gre.py
index 0cec5e3c9..074977500 100644
--- a/python/vyos/ifconfig/vpp/gre.py
+++ b/python/vyos/ifconfig/vpp/gre.py
@@ -141,4 +141,7 @@ class VPPGREInterface(Interface, VPPInterface):
         if rx_mode:
             self.set_rx_mode(rx_mode)
 
-        super().update(config)
+        # Apply VPP-specific interface settings
+        VPPInterface.update(self, config)
+
+        super().update(config)
\ No newline at end of file
diff --git a/python/vyos/ifconfig/vpp/interface.py b/python/vyos/ifconfig/vpp/interface.py
index 1b87af4d2..17a897f74 100644
--- a/python/vyos/ifconfig/vpp/interface.py
+++ b/python/vyos/ifconfig/vpp/interface.py
@@ -54,3 +54,20 @@ class VPPInterface:
             lcp_name = lcp_pair.get('vpp_name_kernel')
             if lcp_name:
                 self.vpp.iface_rxmode(lcp_name, rx_mode)
+
+    def set_mtu_vpp(self, mtu):
+        # Set MTU for the VPP interface
+        self.vpp.set_iface_mtu(self.vpp_ifname, mtu)
+
+        # Set MTU for the LCP pair interface
+        lcp_pair = self.vpp.lcp_pair_find(vpp_name_hw=self.vpp_ifname)
+        if lcp_pair:
+            lcp_name = lcp_pair.get('vpp_name_kernel')
+            if lcp_name:
+                self.vpp.set_iface_mtu(lcp_name, mtu)
+
+    def update(self, config):
+        # Set MTU
+        if 'mtu' in config:
+            mtu = int(config['mtu'])
+            self.set_mtu_vpp(mtu)
diff --git a/python/vyos/ifconfig/vpp/ipip.py b/python/vyos/ifconfig/vpp/ipip.py
index fff79fd43..baec9f1c7 100644
--- a/python/vyos/ifconfig/vpp/ipip.py
+++ b/python/vyos/ifconfig/vpp/ipip.py
@@ -105,5 +105,8 @@ class VPPIPIPInterface(Interface, VPPInterface):
         if rx_mode:
             self.set_rx_mode(rx_mode)
 
+        # Apply VPP-specific interface settings
+        VPPInterface.update(self, config)
+
         # Apply all settings to the lcp pair (kernel) interface
         super().update(config)
diff --git a/python/vyos/ifconfig/vpp/loopback.py b/python/vyos/ifconfig/vpp/loopback.py
index 36a30cb58..5ef7ead23 100644
--- a/python/vyos/ifconfig/vpp/loopback.py
+++ b/python/vyos/ifconfig/vpp/loopback.py
@@ -101,5 +101,7 @@ class VPPLoopbackInterface(Interface, VPPInterface):
         if rx_mode:
             self.set_rx_mode(rx_mode)
 
+        VPPInterface.update(self, config)
+
         # Apply all settings to the lcp pair (kernel) interface
         super().update(config)
diff --git a/python/vyos/ifconfig/vpp/vxlan.py b/python/vyos/ifconfig/vpp/vxlan.py
index 8ca9bee70..da4e7ed50 100644
--- a/python/vyos/ifconfig/vpp/vxlan.py
+++ b/python/vyos/ifconfig/vpp/vxlan.py
@@ -122,4 +122,6 @@ class VPPVXLANInterface(Interface, VPPInterface):
         if rx_mode:
             self.set_rx_mode(rx_mode)
 
+        VPPInterface.update(self, config)
+
         super().update(config)
diff --git a/python/vyos/utils/network.py b/python/vyos/utils/network.py
index 217428a21..de283e546 100644
--- a/python/vyos/utils/network.py
+++ b/python/vyos/utils/network.py
@@ -696,3 +696,28 @@ def is_valid_ipv6_address_or_range(addr: str) -> bool:
             return ip_network(addr).version == 6
     except:
         return False
+
+
+def get_interfaces_by_ip(ip_address: str) -> list:
+    """
+    Return a list of all interface names assigned the given IP address.
+    Args:
+        ip_address (str): The IP address to search for.
+    Returns:
+        list: List of interface names (str) that have the given IP address assigned.
+              Returns an empty list if no interface has the IP assigned.
+    """
+    import netifaces
+    from vyos.template import is_ipv6
+
+    addr_type = AF_INET
+    if is_ipv6(ip_address):
+        addr_type = AF_INET6
+
+    ifaces = []
+    for interface in netifaces.interfaces():
+        addresses = netifaces.ifaddresses(interface)
+        for addr_info in addresses.get(addr_type, []):
+            if addr_info.get('addr') == ip_address:
+                ifaces.append(interface)
+    return ifaces
diff --git a/python/vyos/vpp/control_vpp.py b/python/vyos/vpp/control_vpp.py
index 2daaed423..5f3a18848 100644
--- a/python/vyos/vpp/control_vpp.py
+++ b/python/vyos/vpp/control_vpp.py
@@ -422,8 +422,11 @@ class VPPControl:
             mtu (int): MTU
         """
         iface_index = self.get_sw_if_index(iface_name_vpp)
-        api_call_args: dict[str, str | int] = {'sw_if_index': iface_index, 'mtu': mtu}
-        return self.__vpp_api_client.api.hw_interface_set_mtu(**api_call_args)
+        api_call_args: dict[str, int | list[int]] = {
+            'sw_if_index': iface_index,
+            'mtu': [mtu, 0, 0, 0],
+        }
+        return self.__vpp_api_client.api.sw_interface_set_mtu(**api_call_args)
 
     @_Decorators.api_call
     def get_sw_if_dev_type(self, ifname: str) -> int | None:
diff --git a/src/conf_mode/vpp_interfaces_bonding.py b/src/conf_mode/vpp_interfaces_bonding.py
index 8d9930a20..80356ce2b 100644
--- a/src/conf_mode/vpp_interfaces_bonding.py
+++ b/src/conf_mode/vpp_interfaces_bonding.py
@@ -19,10 +19,12 @@
 from vyos.config import Config
 from vyos.configdict import get_interface_dict
 from vyos.configdep import set_dependents, call_dependents
+from vyos.configverify import verify_mtu_ipv6
 from vyos import ConfigError
 from vyos.utils.assertion import assert_mac
 from vyos.utils.process import is_systemd_service_active
 
+from vyos.ifconfig import Interface
 from vyos.ifconfig.vpp import VPPBondInterface
 from vyos.vpp.config_deps import deps_bond_dict
 from vyos.vpp.config_deps import deps_bridge_dict
@@ -174,6 +176,19 @@ def verify(config):
                 f'it already belongs to bridge interface: {", ".join(bridge_members)}.'
             )
 
+        if mtu := config.get('mtu'):
+            mtu = int(mtu)
+            max_mtu = Interface(iface).get_max_mtu()
+            min_mtu = Interface(iface).get_min_mtu()
+            if mtu > max_mtu:
+                raise ConfigError(
+                    f'Configured MTU is greater than member interface "{iface}" maximum of {max_mtu}!'
+                )
+            if mtu < min_mtu:
+                raise ConfigError(
+                    f'Configured MTU is less than member interface "{iface}" minimum of {min_mtu}!'
+                )
+
     if 'mac' in config:
         mac = config['mac']
         try:
@@ -190,6 +205,8 @@ def verify(config):
                 f'Cannot remove interface {vif_iface}: it is still in use by the PPPoE server'
             )
 
+    verify_mtu_ipv6(config)
+
 
 def generate(config):
     pass
diff --git a/src/conf_mode/vpp_interfaces_gre.py b/src/conf_mode/vpp_interfaces_gre.py
index 1258f906c..3756449a2 100644
--- a/src/conf_mode/vpp_interfaces_gre.py
+++ b/src/conf_mode/vpp_interfaces_gre.py
@@ -21,6 +21,7 @@ from vyos import ConfigError
 from vyos.config import Config
 from vyos.configdict import get_interface_dict
 from vyos.configdep import set_dependents, call_dependents
+from vyos.configverify import verify_mtu_ipv6
 from vyos.utils.process import is_systemd_service_active
 
 from vyos.ifconfig.vpp import VPPGREInterface
@@ -128,6 +129,8 @@ def verify(config):
     if config.get('source_address') == config.get('remote'):
         raise ConfigError('Remote address must not be the same as source address')
 
+    verify_mtu_ipv6(config)
+
     # Disable checks as point-to-multipoint mode does not work without 'teib' feature that is not implemented yet
     # # check multipoint mode
     # if config.get('mode') == 'point-to-multipoint':
diff --git a/src/conf_mode/vpp_interfaces_ipip.py b/src/conf_mode/vpp_interfaces_ipip.py
index d029f3619..dd4a19e36 100644
--- a/src/conf_mode/vpp_interfaces_ipip.py
+++ b/src/conf_mode/vpp_interfaces_ipip.py
@@ -21,6 +21,7 @@ from vyos import ConfigError
 from vyos.config import Config
 from vyos.configdict import get_interface_dict
 from vyos.configdep import set_dependents, call_dependents
+from vyos.configverify import verify_mtu_ipv6
 from vyos.utils.process import is_systemd_service_active
 
 from vyos.ifconfig.vpp import VPPIPIPInterface
@@ -102,6 +103,8 @@ def verify(config):
     if config.get('source_address') == config.get('remote'):
         raise ConfigError('Remote address must not be the same as source address')
 
+    verify_mtu_ipv6(config)
+
 
 def generate(config):
     pass
diff --git a/src/conf_mode/vpp_interfaces_vxlan.py b/src/conf_mode/vpp_interfaces_vxlan.py
index 38349cb4c..ac9a9517b 100644
--- a/src/conf_mode/vpp_interfaces_vxlan.py
+++ b/src/conf_mode/vpp_interfaces_vxlan.py
@@ -18,9 +18,14 @@
 
 from vyos import ConfigError
 
+from vyos.base import Warning
 from vyos.config import Config
 from vyos.configdict import get_interface_dict
 from vyos.configdep import set_dependents, call_dependents
+from vyos.configverify import verify_mtu_ipv6
+from vyos.ifconfig import Interface
+from vyos.template import is_ipv6
+from vyos.utils.network import get_interfaces_by_ip
 from vyos.utils.process import is_systemd_service_active
 
 from vyos.ifconfig.vpp import VPPVXLANInterface
@@ -117,6 +122,29 @@ def verify(config):
     if config.get('source_address') == config.get('remote'):
         raise ConfigError('Remote address must not be the same as source address')
 
+    # VXLAN adds at least an overhead of 50 bytes - we need to check the
+    # underlying device if our VXLAN package is not going to be fragmented!
+    source_address = config['source_address']
+    vxlan_overhead = 50
+    if is_ipv6(source_address):
+        # IPv6 adds an extra 20 bytes overhead because the IPv6 header is 20
+        # bytes larger than the IPv4 header - assuming no extra options are
+        # in use.
+        vxlan_overhead += 20
+
+    ifaces_with_ip = get_interfaces_by_ip(source_address)
+    vpp_ifaces = config['vpp_ether_vif_ifaces']
+    matching_iface = next((iface for iface in ifaces_with_ip if iface in vpp_ifaces))
+
+    lower_mtu = Interface(matching_iface).get_mtu()
+    if lower_mtu < (int(config['mtu']) + vxlan_overhead):
+        Warning(
+            f'Underlying device MTU is too small ({lower_mtu} bytes) '
+            f'for VXLAN overhead ({vxlan_overhead} bytes!)'
+        )
+
+    verify_mtu_ipv6(config)
+
 
 def generate(config):
     pass