1 files changed, 148 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_mpls.py b/src/conf_mode/protocols_mpls.py
new file mode 100644
index 0000000..ad164db
--- /dev/null
+++ b/src/conf_mode/protocols_mpls.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020-2022 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 glob import glob
+from vyos.config import Config
+from vyos.template import render_to_string
+from vyos.utils.dict import dict_search
+from vyos.utils.file import read_file
+from vyos.utils.system import sysctl_write
+from vyos.configverify import verify_interface_exists
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/tmp/ldpd.frr'
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['protocols', 'mpls']
+
+    mpls = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    return mpls
+
+def verify(mpls):
+    # If no config, then just bail out early.
+    if not mpls:
+        return None
+
+    if 'interface' in mpls:
+        for interface in mpls['interface']:
+            verify_interface_exists(mpls, interface)
+
+    # Checks to see if LDP is properly configured
+    if 'ldp' in mpls:
+        # If router ID not defined
+        if 'router_id' not in mpls['ldp']:
+            raise ConfigError('Router ID missing. An LDP router id is mandatory!')
+
+        # If interface not set
+        if 'interface' not in mpls['ldp']:
+            raise ConfigError('LDP interfaces are missing. An LDP interface is mandatory!')
+
+        # If transport addresses are not set
+        if not dict_search('ldp.discovery.transport_ipv4_address', mpls) and \
+           not dict_search('ldp.discovery.transport_ipv6_address', mpls):
+                raise ConfigError('LDP transport address missing!')
+
+    return None
+
+def generate(mpls):
+    # If there's no MPLS config generated, create dictionary key with no value.
+    if not mpls or 'deleted' in mpls:
+        return None
+
+    mpls['frr_ldpd_config'] = render_to_string('frr/ldpd.frr.j2', mpls)
+    return None
+
+def apply(mpls):
+    ldpd_damon = 'ldpd'
+
+    # Save original configuration prior to starting any commit actions
+    frr_cfg = frr.FRRConfig()
+
+    frr_cfg.load_configuration(ldpd_damon)
+    frr_cfg.modify_section(f'^mpls ldp', stop_pattern='^exit', remove_stop_mark=True)
+
+    if 'frr_ldpd_config' in mpls:
+        frr_cfg.add_before(frr.default_add_before, mpls['frr_ldpd_config'])
+    frr_cfg.commit_configuration(ldpd_damon)
+
+    # Set number of entries in the platform label tables
+    labels = '0'
+    if 'interface' in mpls:
+        labels = '1048575'
+    sysctl_write('net.mpls.platform_labels', labels)
+
+    # Check for changes in global MPLS options
+    if 'parameters' in mpls:
+            # Choose whether to copy IP TTL to MPLS header TTL
+        if 'no_propagate_ttl' in mpls['parameters']:
+            sysctl_write('net.mpls.ip_ttl_propagate', 0)
+            # Choose whether to limit maximum MPLS header TTL
+        if 'maximum_ttl' in mpls['parameters']:
+            ttl = mpls['parameters']['maximum_ttl']
+            sysctl_write('net.mpls.default_ttl', ttl)
+    else:
+        # Set default global MPLS options if not defined.
+        sysctl_write('net.mpls.ip_ttl_propagate', 1)
+        sysctl_write('net.mpls.default_ttl', 255)
+
+    # Enable and disable MPLS processing on interfaces per configuration
+    if 'interface' in mpls:
+        system_interfaces = []
+        # Populate system interfaces list with local MPLS capable interfaces
+        for interface in glob('/proc/sys/net/mpls/conf/*'):
+            system_interfaces.append(os.path.basename(interface))
+        # This is where the comparison is done on if an interface needs to be enabled/disabled.
+        for system_interface in system_interfaces:
+            interface_state = read_file(f'/proc/sys/net/mpls/conf/{system_interface}/input')
+            if '1' in interface_state:
+                if system_interface not in mpls['interface']:
+                    system_interface = system_interface.replace('.', '/')
+                    sysctl_write(f'net.mpls.conf.{system_interface}.input', 0)
+            elif '0' in interface_state:
+                if system_interface in mpls['interface']:
+                    system_interface = system_interface.replace('.', '/')
+                    sysctl_write(f'net.mpls.conf.{system_interface}.input', 1)
+    else:
+        system_interfaces = []
+        # If MPLS interfaces are not configured, set MPLS processing disabled
+        for interface in glob('/proc/sys/net/mpls/conf/*'):
+            system_interfaces.append(os.path.basename(interface))
+        for system_interface in system_interfaces:
+            system_interface = system_interface.replace('.', '/')
+            sysctl_write(f'net.mpls.conf.{system_interface}.input', 0)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)