interfaces: T3090: migrate adjust-mss from "firewall options" to "interface" level

Getting rid of "set firewall options" and move it from:

set firewall options interface ethX adjust-mss 1400
set firewall options interface ethX adjust-mss6 1400

to:

set interfaces ethernet ethX ip adjust-mss 1400
set interfaces ethernet ethX ipv6 adjust-mss 1400

In addition add an extra option called clamp-mss-to-pmtu instead of a value.

1 files changed, 63 insertions, 0 deletions

diff --git a/src/migration-scripts/firewall/5-to-6 b/src/migration-scripts/firewall/5-to-6
new file mode 100755
index 000000000..ccb86830a
--- /dev/null
+++ b/src/migration-scripts/firewall/5-to-6
@@ -0,0 +1,63 @@
+#!/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/>.
+
+# T3090: migrate "firewall options interface <name> adjust-mss" to the
+#        individual interface.
+
+from sys import argv
+from sys import exit
+
+from vyos.configtree import ConfigTree
+from vyos.ifconfig import Section
+
+if (len(argv) < 1):
+    print("Must specify file name!")
+    exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+base = ['firewall', 'options', 'interface']
+config = ConfigTree(config_file)
+
+if not config.exists(base):
+    # Nothing to do
+    exit(0)
+
+for interface in config.list_nodes(base):
+    if config.exists(base + [interface, 'disable']):
+        continue
+
+    if config.exists(base + [interface, 'adjust-mss']):
+        section = Section.section(interface)
+        tmp = config.return_value(base + [interface, 'adjust-mss'])
+        config.set(['interfaces', section, interface, 'ip', 'adjust-mss'], value=tmp)
+
+    if config.exists(base + [interface, 'adjust-mss6']):
+        section = Section.section(interface)
+        tmp = config.return_value(base + [interface, 'adjust-mss6'])
+        config.set(['interfaces', section, interface, 'ipv6', 'adjust-mss'], value=tmp)
+
+config.delete(['firewall', 'options'])
+
+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)