From 07a4920b17c3741b50ffcb596d4433b54f7e529e Mon Sep 17 00:00:00 2001
From: Yuxiang Zhu <vfreex@gmail.com>
Date: Sat, 9 Jul 2022 17:38:29 +0800
Subject: ip: T4517: add option to enable directed broadcast forwarding

Directed broadcast is described in rfc1812#section-5.3.5.2 and rfc2644.

By default Linux kernel doesn't forward directed broadcast
packets unless both of `/proc/sys/net/ipv4/conf/all/bc_forwarding`
and `/proc/sys/net/ipv4/conf/$iface/bc_forwarding` are set to 1.
---
 .../include/interface/enable-directed-broadcast.xml.i             | 8 ++++++++
 interface-definitions/include/interface/ipv4-options.xml.i        | 1 +
 interface-definitions/system-ip.xml.in                            | 6 ++++++
 3 files changed, 15 insertions(+)
 create mode 100644 interface-definitions/include/interface/enable-directed-broadcast.xml.i

(limited to 'interface-definitions')

diff --git a/interface-definitions/include/interface/enable-directed-broadcast.xml.i b/interface-definitions/include/interface/enable-directed-broadcast.xml.i
new file mode 100644
index 000000000..a87395806
--- /dev/null
+++ b/interface-definitions/include/interface/enable-directed-broadcast.xml.i
@@ -0,0 +1,8 @@
+<!-- include start from interface/enable-directed-broadcast.xml.i -->
+<leafNode name="enable-directed-broadcast">
+  <properties>
+    <help>Enable directed broadcast forwarding on this interface</help>
+    <valueless/>
+  </properties>
+</leafNode>
+<!-- include end -->
diff --git a/interface-definitions/include/interface/ipv4-options.xml.i b/interface-definitions/include/interface/ipv4-options.xml.i
index bca1229c6..eda77e851 100644
--- a/interface-definitions/include/interface/ipv4-options.xml.i
+++ b/interface-definitions/include/interface/ipv4-options.xml.i
@@ -8,6 +8,7 @@
     #include <include/interface/arp-cache-timeout.xml.i>
     #include <include/interface/disable-arp-filter.xml.i>
     #include <include/interface/disable-forwarding.xml.i>
+    #include <include/interface/enable-directed-broadcast.xml.i>
     #include <include/interface/enable-arp-accept.xml.i>
     #include <include/interface/enable-arp-announce.xml.i>
     #include <include/interface/enable-arp-ignore.xml.i>
diff --git a/interface-definitions/system-ip.xml.in b/interface-definitions/system-ip.xml.in
index 21d70694b..75fe1c20a 100644
--- a/interface-definitions/system-ip.xml.in
+++ b/interface-definitions/system-ip.xml.in
@@ -23,6 +23,12 @@
               <valueless/>
             </properties>
           </leafNode>
+          <leafNode name="disable-directed-broadcast-forwarding">
+            <properties>
+              <help>Disable IPv4 directed broadcast forwarding on all interfaces</help>
+              <valueless/>
+            </properties>
+          </leafNode>
           <node name="multipath">
             <properties>
               <help>IPv4 multipath settings</help>
-- 
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