doc/ip-sysctl: add bc_forwarding

Let's describe this sysctl.

Fixes: 7191bb78e9f9 ("route: add support for directed broadcast forwarding")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index b0024aa7b0514f7174ebf7512e2c7da256b494d1..66828293d9cb715391459d4dc37868217da55113 100644 (file)
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -267,6 +267,13 @@ ipfrag_max_dist - INTEGER
        from different IP datagrams, which could result in data corruption.
        Default: 64
 
+bc_forwarding - INTEGER
+       bc_forwarding enables the feature described in rfc1812#section-5.3.5.2
+       and rfc2644. It allows the router to forward directed broadcast.
+       To enable this feature, the 'all' entry and the input interface entry
+       should be set to 1.
+       Default: 0
+
 INET peer storage
 =================