From 9763154d99f7852e3fd8a50f8ecaf10b27b4ad0f Mon Sep 17 00:00:00 2001
From: Viacheslav Hletenko <v.gletenko@vyos.io>
Date: Fri, 25 Aug 2023 12:12:29 +0000
Subject: T4825: Add interface type veth
Add interface type veth (Virtual ethernet)
One of the usecases it's interconnect different vrf's and
default vrf via bridge
set interfaces virtual-ethernet veth0 peer-name 'veth1010'
set interfaces virtual-ethernet veth1010 address '10.0.0.10/24'
set interfaces virtual-ethernet veth1010 peer-name 'veth0'
set interfaces virtual-ethernet veth1010 vrf 'foo'
set interfaces bridge br0 address '10.0.0.1/24'
set interfaces bridge br0 member interface veth0
vyos@r1:~$ ping 10.0.0.10 count 1
PING 10.0.0.10 (10.0.0.10) 56(84) bytes of data.
64 bytes from 10.0.0.10: icmp_seq=1 ttl=64 time=0.082 ms
---
src/conf_mode/interfaces-virtual-ethernet.py | 117 +++++++++++++++++++++++++++
1 file changed, 117 insertions(+)
create mode 100755 src/conf_mode/interfaces-virtual-ethernet.py
(limited to 'src')
diff --git a/src/conf_mode/interfaces-virtual-ethernet.py b/src/conf_mode/interfaces-virtual-ethernet.py
new file mode 100755
index 000000000..21f8cdad3
--- /dev/null
+++ b/src/conf_mode/interfaces-virtual-ethernet.py
@@ -0,0 +1,117 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 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/>.
+
+from sys import exit
+
+from netifaces import interfaces
+from vyos import ConfigError
+from vyos import airbag
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.configverify import verify_address
+from vyos.configverify import verify_bridge_delete
+from vyos.configverify import verify_vrf
+from vyos.ifconfig import VethIf
+
+airbag.enable()
+
+def get_config(config=None):
+ """
+ Retrive CLI config as dictionary. Dictionary can never be empty, as at
+ least the interface name will be added or a deleted flag
+ """
+ if config:
+ conf = config
+ else:
+ conf = Config()
+ base = ['interfaces', 'virtual-ethernet']
+ veth = get_interface_dict(conf, base)
+
+ # We need to know all other veth related interfaces as veth requires a 1:1
+ # mapping for the peer-names. The Linux kernel automatically creates both
+ # interfaces, the local one and the peer-name, but VyOS also needs a peer
+ # interfaces configrued on the CLI so we can assign proper IP addresses etc.
+ conf.set_level(base)
+ veth['other_interfaces'] = conf.get_config_dict([], key_mangling=('-', '_'),
+ get_first_key=True,
+ no_tag_node_value_mangle=True)
+
+ return veth
+
+
+def verify(veth):
+ if 'deleted' in veth:
+ verify_bridge_delete(veth)
+ # Prevent to delete veth interface which used for another "vethX peer-name"
+ for iface, iface_config in veth['other_interfaces'].items():
+ if veth['ifname'] in iface_config['peer_name']:
+ ifname = veth['ifname']
+ raise ConfigError(
+ f'Cannot delete "{ifname}" used for "interface {iface} peer-name"'
+ )
+ return None
+
+ verify_vrf(veth)
+ verify_address(veth)
+
+ if 'peer_name' not in veth:
+ raise ConfigError(f'Remote peer name must be set for "{veth["ifname"]}"!')
+
+ peer_name = veth['peer_name']
+ ifname = veth['ifname']
+
+ if veth['peer_name'] not in veth['other_interfaces']:
+ raise ConfigError(f'Used peer-name "{peer_name}" on interface "{ifname}" ' \
+ 'is not configured!')
+
+ if veth['other_interfaces'][peer_name]['peer_name'] != ifname:
+ raise ConfigError(
+ f'Configuration mismatch between "{ifname}" and "{peer_name}"!')
+
+ if peer_name == ifname:
+ raise ConfigError(
+ f'Peer-name "{peer_name}" cannot be the same as interface "{ifname}"!')
+
+ return None
+
+
+def generate(peth):
+ return None
+
+
+def apply(veth):
+ # Check if the Veth interface already exists
+ if 'rebuild_required' in veth or 'deleted' in veth:
+ if veth['ifname'] in interfaces():
+ p = VethIf(veth['ifname'])
+ p.remove()
+
+ if 'deleted' not in veth:
+ p = VethIf(**veth)
+ p.update(veth)
+
+ return None
+
+
+if __name__ == '__main__':
+ try:
+ c = get_config()
+ verify(c)
+ generate(c)
+ apply(c)
+ except ConfigError as e:
+ print(e)
+ exit(1)
--
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