ip: update the description of rp_filter in ip-sysctl.txt

The commit 27fed4175acf81ddd91d9a4ee2fd298981f60295 (ip: fix logic of
reverse path filter sysctl) has changed the logic of rp_filter.  The
document about rp_filter is out of date. Now, setting
conf/all/rp_filte with 0 can also enable source validation.

Update the document according to the commit.

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index fbe427a6580c..5dcc06721bba 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -738,8 +738,8 @@ rp_filter - INTEGER
         to prevent IP spoofing from DDos attacks. If using asymmetric routing
         or other complicated routing, then loose mode is recommended.
 
-        conf/all/rp_filter must also be set to non-zero to do source validation
-        on the interface
+        The max value from conf/{all,interface}/rp_filter is used
+        when doing source validation on the {interface}.
 
         Default value is 0. Note that some distributions enable it
         in startup scripts.