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[Bug 2107552] [NEW] Disable gateway error with flow based DHCP

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Public bug reported:

Reproduce:
1. Create VXLAN network + subnet with disable gateway option and enable DHCP
2. Create VM on that network
3. Check log neutron openvswitch


Log:

2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager [req-99d7dca8-b870-4ae2-a54e-3fd2485b51ad - - - - -] DHCPv4Responder: Exception occurred during handler processing. Backtrace from offending handler [
packet_in_handler] servicing event [EventOFPPacketIn] follows.: TypeError: unexpected type <class 'NoneType'> for addr arg
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager Traceback (most recent call last):
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/lib/addrconv.py", line 29, in text_to_bin
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     return self._addr(text, **self._addr_kwargs).packed
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 316, in __init__
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     if 0 <= int(addr) <= self._module.max_int:
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager During handling of the above exception, another exception occurred:
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager Traceback (most recent call last):
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/base/app_manager.py", line 289, in _event_loop
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     handler(ev)
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py", line 38, in p
acket_in_handler
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     caller(ev)                                                                                                                                        2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/base.py", line 108, in _packet_in_handler
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     self.handle_dhcp(datapath, of_in_port, pkt, port_info)
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 210, in handle_dhcp                           2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     self.assemble_offer(pkt, port_info))
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 192, in assemble_offer
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     offer = self.get_ret_packet(pkt, port_info)                                                                                                       2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 151, in get_ret_packet
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     options = self.get_dhcp_options(port_info, is_ack)
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 75, in get_dhcp_options                       2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     bin_server = addrconv.ipv4.text_to_bin(gateway_ip)
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/lib/addrconv.py", line 36, in text_to_bin
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     ip = self._fallback(text, **self._addr_kwargs)                                                                                                    2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 930, in __init__
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     value, prefixlen = parse_ip_network(_ipv4, addr,
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 831, in parse_ip_network                                        2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     raise TypeError('unexpected type %s for addr arg' % type(addr))
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager TypeError: unexpected type <class 'NoneType'> for addr arg
2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager                                                                                                                                                       2025-04-17 14:46:55.762 6 INFO neutron.agent.l2.extensions.dhcp.base [req-333c7bb7-8355-4058-80d8-4a50e8a92c15 - - - - -] DHCP Controller packet in OF port: 589

** Affects: neutron
     Importance: Undecided
     Assignee: Dai Dang Van (daikk115)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Dai Dang Van (daikk115)

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https://bugs.launchpad.net/bugs/2107552

Title:
  Disable gateway error with flow based DHCP

Status in neutron:
  New

Bug description:
  Reproduce:
  1. Create VXLAN network + subnet with disable gateway option and enable DHCP
  2. Create VM on that network
  3. Check log neutron openvswitch

  
  Log:

  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager [req-99d7dca8-b870-4ae2-a54e-3fd2485b51ad - - - - -] DHCPv4Responder: Exception occurred during handler processing. Backtrace from offending handler [
  packet_in_handler] servicing event [EventOFPPacketIn] follows.: TypeError: unexpected type <class 'NoneType'> for addr arg
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager Traceback (most recent call last):
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/lib/addrconv.py", line 29, in text_to_bin
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     return self._addr(text, **self._addr_kwargs).packed
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 316, in __init__
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     if 0 <= int(addr) <= self._module.max_int:
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager During handling of the above exception, another exception occurred:
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager Traceback (most recent call last):
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/base/app_manager.py", line 289, in _event_loop
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     handler(ev)
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/base_oskenapp.py", line 38, in p
  acket_in_handler
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     caller(ev)                                                                                                                                        2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/base.py", line 108, in _packet_in_handler
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     self.handle_dhcp(datapath, of_in_port, pkt, port_info)
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 210, in handle_dhcp                           2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     self.assemble_offer(pkt, port_info))
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 192, in assemble_offer
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     offer = self.get_ret_packet(pkt, port_info)                                                                                                       2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 151, in get_ret_packet
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     options = self.get_dhcp_options(port_info, is_ack)
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/neutron/agent/l2/extensions/dhcp/ipv4.py", line 75, in get_dhcp_options                       2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     bin_server = addrconv.ipv4.text_to_bin(gateway_ip)
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/os_ken/lib/addrconv.py", line 36, in text_to_bin
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     ip = self._fallback(text, **self._addr_kwargs)                                                                                                    2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 930, in __init__
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     value, prefixlen = parse_ip_network(_ipv4, addr,
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager   File "/var/lib/kolla/venv/lib/python3.8/site-packages/netaddr/ip/__init__.py", line 831, in parse_ip_network                                        2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager     raise TypeError('unexpected type %s for addr arg' % type(addr))
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager TypeError: unexpected type <class 'NoneType'> for addr arg
  2025-04-17 14:46:55.762 6 ERROR os_ken.base.app_manager                                                                                                                                                       2025-04-17 14:46:55.762 6 INFO neutron.agent.l2.extensions.dhcp.base [req-333c7bb7-8355-4058-80d8-4a50e8a92c15 - - - - -] DHCP Controller packet in OF port: 589

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