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authorChristian Poessinger <christian@poessinger.com>2021-07-17 22:33:09 +0200
committerGitHub <noreply@github.com>2021-07-17 22:33:09 +0200
commit76466a4b974a0c7808bf7ab4f621a32f04daad3a (patch)
tree8fff16af04de6751f5334695d6b130c90b2915a7 /src/migration-scripts
parent94531412e7309740a92e8099f62e61a6f7d739cb (diff)
parent22791e26f444766dc9f9e1729b72893208f58079 (diff)
downloadvyos-1x-76466a4b974a0c7808bf7ab4f621a32f04daad3a.tar.gz
vyos-1x-76466a4b974a0c7808bf7ab4f621a32f04daad3a.zip
Merge pull request #927 from zdc/T3655-sagitta
VRF: T3655: proper connection tracking for VRFs
Diffstat (limited to 'src/migration-scripts')
-rwxr-xr-xsrc/migration-scripts/vrf/2-to-3144
1 files changed, 144 insertions, 0 deletions
diff --git a/src/migration-scripts/vrf/2-to-3 b/src/migration-scripts/vrf/2-to-3
new file mode 100755
index 000000000..8e0f97141
--- /dev/null
+++ b/src/migration-scripts/vrf/2-to-3
@@ -0,0 +1,144 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Since connection tracking zones are int16, VRFs tables maximum value must
+# be limited to 65535
+# Also, interface names in nftables cannot start from numbers,
+# so VRF name should not start from a number
+
+from sys import argv
+from sys import exit
+from random import randrange
+from random import choice
+from string import ascii_lowercase
+from vyos.configtree import ConfigTree
+import re
+
+
+# Helper function to find all config items with a VRF name
+def _search_vrfs(config_commands, vrf_name):
+ vrf_values = []
+ # Regex to find path of config command with old VRF
+ regex_filter = re.compile(rf'^set (?P<cmd_path>[^\']+vrf) \'{vrf_name}\'$')
+ # Check each command for VRF value
+ for config_command in config_commands:
+ search_result = regex_filter.search(config_command)
+ if search_result:
+ # Append VRF command to a list
+ vrf_values.append(search_result.group('cmd_path').split())
+ if vrf_values:
+ return vrf_values
+ else:
+ return None
+
+
+# Helper function to find all config items with a table number
+def _search_tables(config_commands, table_num):
+ table_items = {'table_tags': [], 'table_values': []}
+ # Regex to find values and nodes with a table number
+ regex_tags = re.compile(rf'^set (?P<cmd_path>[^\']+table {table_num}) ?.*$')
+ regex_values = re.compile(
+ rf'^set (?P<cmd_path>[^\']+table) \'{table_num}\'$')
+ for config_command in config_commands:
+ # Search for tag nodes
+ search_result = regex_tags.search(config_command)
+ if search_result:
+ # Append table node path to a tag nodes list
+ cmd_path = search_result.group('cmd_path').split()
+ if cmd_path not in table_items['table_tags']:
+ table_items['table_tags'].append(cmd_path)
+ # Search for value nodes
+ search_result = regex_values.search(config_command)
+ if search_result:
+ # Append table node path to a value nodes list
+ table_items['table_values'].append(
+ search_result.group('cmd_path').split())
+ return table_items
+
+
+if (len(argv) < 2):
+ print("Must specify file name!")
+ exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+ config_file = f.read()
+
+base = ['vrf', 'name']
+config = ConfigTree(config_file)
+
+if not config.exists(base):
+ # Nothing to do
+ exit(0)
+
+# Get a list of all currently used VRFs and tables
+vrfs_current = {}
+for vrf in config.list_nodes(base):
+ vrfs_current[vrf] = int(config.return_value(base + [vrf, 'table']))
+
+# Check VRF names and table numbers
+name_regex = re.compile(r'^\d.*$')
+for vrf_name, vrf_table in vrfs_current.items():
+ # Check table number
+ if vrf_table > 65535:
+ # Find new unused table number
+ vrfs_current[vrf_name] = None
+ while not vrfs_current[vrf_name]:
+ table_random = randrange(100, 65535)
+ if table_random not in vrfs_current.values():
+ vrfs_current[vrf_name] = table_random
+ # Update number to a new one
+ config.set(['vrf', 'name', vrf_name, 'table'],
+ vrfs_current[vrf_name],
+ replace=True)
+ # Check config items with old table number and replace to new one
+ config_commands = config.to_commands().split('\n')
+ table_config_lines = _search_tables(config_commands, vrf_table)
+ # Rename table nodes
+ if table_config_lines.get('table_tags'):
+ for table_config_path in table_config_lines.get('table_tags'):
+ config.rename(table_config_path, f'{vrfs_current[vrf_name]}')
+ # Replace table values
+ if table_config_lines.get('table_values'):
+ for table_config_path in table_config_lines.get('table_values'):
+ config.set(table_config_path,
+ f'{vrfs_current[vrf_name]}',
+ replace=True)
+
+ # Check VRF name
+ if name_regex.match(vrf_name):
+ vrf_name_new = None
+ while not vrf_name_new:
+ vrf_name_rand = f'{choice(ascii_lowercase)}{vrf_name}'[:15]
+ if vrf_name_rand not in vrfs_current:
+ vrf_name_new = vrf_name_rand
+ # Update VRF name to a new one
+ config.rename(['vrf', 'name', vrf_name], vrf_name_new)
+ # Check config items with old VRF name and replace to new one
+ config_commands = config.to_commands().split('\n')
+ vrf_config_lines = _search_vrfs(config_commands, vrf_name)
+ # Rename VRF to a new name
+ if vrf_config_lines:
+ for vrf_value_path in vrf_config_lines:
+ config.set(vrf_value_path, vrf_name_new, replace=True)
+
+try:
+ with open(file_name, 'w') as f:
+ f.write(config.to_string())
+except OSError as e:
+ print("Failed to save the modified config: {}".format(e))
+ exit(1)