From 63e787e03129cd799a7fdc6078ff885cdb9b13bf Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Thu, 26 Dec 2019 17:12:28 +0100
Subject: ip: migrate 'system ip' subsystem to XML/Python

---
 interface-definitions/system-ip.xml.in | 58 ++++++++++++++++++++++++
 src/conf_mode/system-ip.py             | 81 ++++++++++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 interface-definitions/system-ip.xml.in
 create mode 100755 src/conf_mode/system-ip.py

diff --git a/interface-definitions/system-ip.xml.in b/interface-definitions/system-ip.xml.in
new file mode 100644
index 000000000..14b3b8a07
--- /dev/null
+++ b/interface-definitions/system-ip.xml.in
@@ -0,0 +1,58 @@
+<?xml version="1.0"?>
+<interfaceDefinition>
+  <node name="system">
+    <children>
+      <node name="ip" owner="${vyos_conf_scripts_dir}/system-ip.py">
+        <properties>
+          <help>IPv4 Settings</help>
+          <priority>400</priority>
+        </properties>
+        <children>
+          <node name="arp">
+            <properties>
+              <help>Parameters for ARP cache</help>
+            </properties>
+            <children>
+              <leafNode name="table-size">
+                <properties>
+                  <help>Maximum number of entries to keep in the ARP cache</help>
+                  <completionHelp>
+                    <list>1024 2048 4096 8192 16384 32768</list>
+                  </completionHelp>
+                  <constraint>
+                    <regex>(1024|2048|4096|8192|16384|32768)</regex>
+                  </constraint>
+                </properties>
+              </leafNode>
+            </children>
+          </node>
+          <leafNode name="disable-forwarding">
+            <properties>
+              <help>Disable IPv4 forwarding on all interfaces</help>
+              <valueless/>
+            </properties>
+          </leafNode>
+          <node name="multipath">
+            <properties>
+              <help>IPv4 multipath settings</help>
+            </properties>
+            <children>
+              <leafNode name="ignore-unreachable-nexthops">
+                <properties>
+                  <help>Ignore next hops that are not in the ARP table</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
+              <leafNode name="layer4-hashing">
+                <properties>
+                  <help>Use layer 4 information for ECMP hashing</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
+            </children>
+          </node>
+        </children>
+      </node>
+    </children>
+  </node>
+</interfaceDefinition>
diff --git a/src/conf_mode/system-ip.py b/src/conf_mode/system-ip.py
new file mode 100755
index 000000000..335507411
--- /dev/null
+++ b/src/conf_mode/system-ip.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 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 copy import deepcopy
+from vyos.config import Config
+from vyos import ConfigError
+
+default_config_data = {
+    'arp_table': 8192,
+    'ipv4_forward': '1',
+    'mp_unreach_nexthop': '0',
+    'mp_layer4_hashing': '0'
+}
+
+def sysctl(name, value):
+    os.system('sysctl -wq {}={}'.format(name, value))
+
+def get_config():
+    ip_opt = deepcopy(default_config_data)
+    conf = Config()
+    conf.set_level('system ip')
+    if conf.exists(''):
+        if conf.exists('arp table-size'):
+            ip_opt['arp_table'] = int(conf.return_value('arp table-size'))
+
+        if conf.exists('disable-forwarding'):
+            ip_opt['ipv4_forward'] = '0'
+
+        if conf.exists('multipath ignore-unreachable-nexthops'):
+            ip_opt['mp_unreach_nexthop'] = '1'
+
+        if conf.exists('multipath layer4-hashing'):
+            ip_opt['mp_layer4_hashing'] = '1'
+
+    return ip_opt
+
+def verify(ip_opt):
+    pass
+
+def generate(ip_opt):
+    pass
+
+def apply(ip_opt):
+    # apply ARP threshold values
+    sysctl('net.ipv4.neigh.default.gc_thresh3', ip_opt['arp_table'])
+    sysctl('net.ipv4.neigh.default.gc_thresh2', ip_opt['arp_table'] // 2)
+    sysctl('net.ipv4.neigh.default.gc_thresh1', ip_opt['arp_table'] // 8)
+
+    # enable/disable IPv4 forwarding
+    with open('/proc/sys/net/ipv4/conf/all/forwarding', 'w') as f:
+        f.write(ip_opt['ipv4_forward'])
+
+    # configure multipath
+    sysctl('net.ipv4.fib_multipath_use_neigh', ip_opt['mp_unreach_nexthop'])
+    sysctl('net.ipv4.fib_multipath_hash_policy', ip_opt['mp_layer4_hashing'])
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)
-- 
cgit v1.2.3