ipv4: flush route cache after change accept_local

[ Upstream commit d01ff0a049f749e0bf10a35bb23edd012718c8c2 ]

After reset ipv4_devconf->data[IPV4_DEVCONF_ACCEPT_LOCAL] to 0,
we should flush route cache, or it will continue receive packets with local
source address, which should be dropped.

Signed-off-by: Weiping Pan <panweiping3@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 4155abc..7d7fb20 100644 (file)
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1490,7 +1490,9 @@ static int devinet_conf_proc(ctl_table *ctl, int write,
                             void __user *buffer,
                             size_t *lenp, loff_t *ppos)
 {
+       int old_value = *(int *)ctl->data;
        int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+       int new_value = *(int *)ctl->data;
 
        if (write) {
                struct ipv4_devconf *cnf = ctl->extra1;
@@ -1501,6 +1503,9 @@ static int devinet_conf_proc(ctl_table *ctl, int write,
 
                if (cnf == net->ipv4.devconf_dflt)
                        devinet_copy_dflt_conf(net, i);
+               if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1)
+                       if ((new_value == 0) && (old_value != 0))
+                               rt_cache_flush(net, 0);
        }
 
        return ret;