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authorChristian Breunig <christian@breunig.cc>2024-07-20 10:35:44 +0200
committerChristian Breunig <christian@breunig.cc>2024-07-20 11:46:28 +0200
commit452068ce78581bb6fba2df4dba197e95b9aeb33d (patch)
treed6446320a87996d1b2cd1a54e92a162f960b5c20 /python
parent35644bc5a166c86596272c8b020679aa92034a9f (diff)
downloadvyos-1x-452068ce78581bb6fba2df4dba197e95b9aeb33d.tar.gz
vyos-1x-452068ce78581bb6fba2df4dba197e95b9aeb33d.zip
interfaces: T6592: moving an interface between VRF instances failed
To reproduce: set vrf name mgmt table '150' set vrf name no-mgmt table '151' set interfaces ethernet eth2 vrf 'mgmt' commit set interfaces ethernet eth2 vrf no-mgmt commit This resulted in an error while interacting with nftables: [Errno 1] failed to run command: nft add element inet vrf_zones ct_iface_map { "eth2" : 151 } The reason is that the old mapping entry still exists and was not removed. This commit adds a new utility function get_vrf_tableid() and compares the current and new VRF table IDs assigned to an interface. If the IDs do not match, the nftables ct_iface_map entry is removed before the new entry is added.
Diffstat (limited to 'python')
-rw-r--r--python/vyos/ifconfig/interface.py28
-rw-r--r--python/vyos/utils/network.py23
2 files changed, 37 insertions, 14 deletions
diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 117479ade..748830004 100644
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -37,6 +37,7 @@ from vyos.utils.network import mac2eui64
from vyos.utils.dict import dict_search
from vyos.utils.network import get_interface_config
from vyos.utils.network import get_interface_namespace
+from vyos.utils.network import get_vrf_tableid
from vyos.utils.network import is_netns_interface
from vyos.utils.process import is_systemd_service_active
from vyos.utils.process import run
@@ -402,7 +403,7 @@ class Interface(Control):
if netns: cmd = f'ip netns exec {netns} {cmd}'
return self._cmd(cmd)
- def _set_vrf_ct_zone(self, vrf):
+ def _set_vrf_ct_zone(self, vrf, old_vrf_tableid=None):
"""
Add/Remove rules in nftables to associate traffic in VRF to an
individual conntack zone
@@ -411,20 +412,27 @@ class Interface(Control):
if 'netns' in self.config:
return None
+ def nft_check_and_run(nft_command):
+ # Check if deleting is possible first to avoid raising errors
+ _, err = self._popen(f'nft --check {nft_command}')
+ if not err:
+ # Remove map element
+ self._cmd(f'nft {nft_command}')
+
if vrf:
# Get routing table ID for VRF
- vrf_table_id = get_interface_config(vrf).get('linkinfo', {}).get(
- 'info_data', {}).get('table')
+ vrf_table_id = get_vrf_tableid(vrf)
# Add map element with interface and zone ID
if vrf_table_id:
+ # delete old table ID from nftables if it has changed, e.g. interface moved to a different VRF
+ if old_vrf_tableid and old_vrf_tableid != int(vrf_table_id):
+ nft_del_element = f'delete element inet vrf_zones ct_iface_map {{ "{self.ifname}" }}'
+ nft_check_and_run(nft_del_element)
+
self._cmd(f'nft add element inet vrf_zones ct_iface_map {{ "{self.ifname}" : {vrf_table_id} }}')
else:
nft_del_element = f'delete element inet vrf_zones ct_iface_map {{ "{self.ifname}" }}'
- # Check if deleting is possible first to avoid raising errors
- _, err = self._popen(f'nft --check {nft_del_element}')
- if not err:
- # Remove map element
- self._cmd(f'nft {nft_del_element}')
+ nft_check_and_run(nft_del_element)
def get_min_mtu(self):
"""
@@ -601,8 +609,10 @@ class Interface(Control):
if tmp == vrf:
return False
+ # Get current VRF table ID
+ old_vrf_tableid = get_vrf_tableid(self.ifname)
self.set_interface('vrf', vrf)
- self._set_vrf_ct_zone(vrf)
+ self._set_vrf_ct_zone(vrf, old_vrf_tableid)
return True
def set_arp_cache_tmo(self, tmo):
diff --git a/python/vyos/utils/network.py b/python/vyos/utils/network.py
index 829124b57..8406a5638 100644
--- a/python/vyos/utils/network.py
+++ b/python/vyos/utils/network.py
@@ -83,6 +83,19 @@ def get_interface_vrf(interface):
return tmp['master']
return 'default'
+def get_vrf_tableid(interface: str):
+ """ Return VRF table ID for given interface name or None """
+ from vyos.utils.dict import dict_search
+ table = None
+ tmp = get_interface_config(interface)
+ # Check if we are "the" VRF interface
+ if dict_search('linkinfo.info_kind', tmp) == 'vrf':
+ table = tmp['linkinfo']['info_data']['table']
+ # or an interface bound to a VRF
+ elif dict_search('linkinfo.info_slave_kind', tmp) == 'vrf':
+ table = tmp['linkinfo']['info_slave_data']['table']
+ return table
+
def get_interface_config(interface):
""" Returns the used encapsulation protocol for given interface.
If interface does not exist, None is returned.
@@ -537,21 +550,21 @@ def ipv6_prefix_length(low, high):
return None
xor = bytearray(a ^ b for a, b in zip(lo, hi))
-
+
plen = 0
while plen < 128 and xor[plen // 8] == 0:
plen += 8
-
+
if plen == 128:
return plen
-
+
for i in range((plen // 8) + 1, 16):
if xor[i] != 0:
return None
-
+
for i in range(8):
msk = ~xor[plen // 8] & 0xff
-
+
if msk == bytemasks[i]:
return plen + i + 1