T5474: establish common file name pattern for XML conf mode commands

We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.

Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in

1 files changed, 120 insertions, 0 deletions

diff --git a/src/conf_mode/system_ipv6.py b/src/conf_mode/system_ipv6.py
new file mode 100755
index 000000000..90a1a8087
--- /dev/null
+++ b/src/conf_mode/system_ipv6.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019-2023 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/>.
+
+import os
+
+from sys import exit
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.configverify import verify_route_map
+from vyos.template import render_to_string
+from vyos.utils.dict import dict_search
+from vyos.utils.file import write_file
+from vyos.utils.process import is_systemd_service_active
+from vyos.utils.system import sysctl_write
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['system', 'ipv6']
+
+    opt = conf.get_config_dict(base, key_mangling=('-', '_'),
+                               get_first_key=True,
+                               with_recursive_defaults=True)
+
+    # When working with FRR we need to know the corresponding address-family
+    opt['afi'] = 'ipv6'
+
+    # We also need the route-map information from the config
+    #
+    # XXX: one MUST always call this without the key_mangling() option! See
+    # vyos.configverify.verify_common_route_maps() for more information.
+    tmp = {'policy' : {'route-map' : conf.get_config_dict(['policy', 'route-map'],
+                                                          get_first_key=True)}}
+    # Merge policy dict into "regular" config dict
+    opt = dict_merge(tmp, opt)
+    return opt
+
+def verify(opt):
+    if 'protocol' in opt:
+        for protocol, protocol_options in opt['protocol'].items():
+            if 'route_map' in protocol_options:
+                verify_route_map(protocol_options['route_map'], opt)
+    return
+
+def generate(opt):
+    opt['frr_zebra_config'] = render_to_string('frr/zebra.route-map.frr.j2', opt)
+    return
+
+def apply(opt):
+    # configure multipath
+    tmp = dict_search('multipath.layer4_hashing', opt)
+    value = '1' if (tmp != None) else '0'
+    sysctl_write('net.ipv6.fib_multipath_hash_policy', value)
+
+    # Apply ND threshold values
+    # table_size has a default value - thus the key always exists
+    size = int(dict_search('neighbor.table_size', opt))
+    # Amount upon reaching which the records begin to be cleared immediately
+    sysctl_write('net.ipv6.neigh.default.gc_thresh3', size)
+    # Amount after which the records begin to be cleaned after 5 seconds
+    sysctl_write('net.ipv6.neigh.default.gc_thresh2', size // 2)
+    # Minimum number of stored records is indicated which is not cleared
+    sysctl_write('net.ipv6.neigh.default.gc_thresh1', size // 8)
+
+    # enable/disable IPv6 forwarding
+    tmp = dict_search('disable_forwarding', opt)
+    value = '0' if (tmp != None) else '1'
+    write_file('/proc/sys/net/ipv6/conf/all/forwarding', value)
+
+    # configure IPv6 strict-dad
+    tmp = dict_search('strict_dad', opt)
+    value = '2' if (tmp != None) else '1'
+    for root, dirs, files in os.walk('/proc/sys/net/ipv6/conf'):
+        for name in files:
+            if name == 'accept_dad':
+                write_file(os.path.join(root, name), value)
+
+    # During startup of vyos-router that brings up FRR, the service is not yet
+    # running when this script is called first. Skip this part and wait for initial
+    # commit of the configuration to trigger this statement
+    if is_systemd_service_active('frr.service'):
+        zebra_daemon = 'zebra'
+        # Save original configuration prior to starting any commit actions
+        frr_cfg = frr.FRRConfig()
+
+        # The route-map used for the FIB (zebra) is part of the zebra daemon
+        frr_cfg.load_configuration(zebra_daemon)
+        frr_cfg.modify_section(r'ipv6 protocol \w+ route-map [-a-zA-Z0-9.]+', stop_pattern='(\s|!)')
+        if 'frr_zebra_config' in opt:
+            frr_cfg.add_before(frr.default_add_before, opt['frr_zebra_config'])
+        frr_cfg.commit_configuration(zebra_daemon)
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)