netns: register net.ipv4.route.flush in each namespace

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 70 insertions, 10 deletions

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 6ef90b5fafb3..a29adf1ba0ff 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -18,6 +18,7 @@ struct netns_ipv4 {
         struct ctl_table_header *forw_hdr;
         struct ctl_table_header *frags_hdr;
         struct ctl_table_header *ipv4_hdr;
+        struct ctl_table_header *route_hdr;
 #endif
         struct ipv4_devconf     *devconf_all;
         struct ipv4_devconf     *devconf_dflt;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 790de32cd7d4..6fe799de9b96 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2835,6 +2835,7 @@ static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write,
 {
         if (write) {
                 int flush_delay;
+                struct net *net;
                 static DEFINE_MUTEX(flush_mutex);
 
                 mutex_lock(&flush_mutex);
@@ -2843,7 +2844,8 @@ static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write,
                 ctl->data = NULL;
                 mutex_unlock(&flush_mutex);
 
-                rt_cache_flush(&init_net, flush_delay);
+                net = (struct net *)ctl->extra1;
+                rt_cache_flush(net, flush_delay);
                 return 0;
         }
 
@@ -2859,24 +2861,18 @@ static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table,
                                                 size_t newlen)
 {
         int delay;
+        struct net *net;
         if (newlen != sizeof(int))
                 return -EINVAL;
         if (get_user(delay, (int __user *)newval))
                 return -EFAULT;
-        rt_cache_flush(&init_net, delay);
+        net = (struct net *)table->extra1;
+        rt_cache_flush(net, delay);
         return 0;
 }
 
 ctl_table ipv4_route_table[] = {
         {
-                .ctl_name       = NET_IPV4_ROUTE_FLUSH,
-                .procname       = "flush",
-                .maxlen         = sizeof(int),
-                .mode           = 0200,
-                .proc_handler   = &ipv4_sysctl_rtcache_flush,
-                .strategy       = &ipv4_sysctl_rtcache_flush_strategy,
-        },
-        {
                 .ctl_name       = NET_IPV4_ROUTE_GC_THRESH,
                 .procname       = "gc_thresh",
                 .data           = &ipv4_dst_ops.gc_thresh,
@@ -3014,6 +3010,66 @@ ctl_table ipv4_route_table[] = {
         },
         { .ctl_name = 0 }
 };
+
+static __net_initdata struct ctl_path ipv4_route_path[] = {
+        { .procname = "net", .ctl_name = CTL_NET, },
+        { .procname = "ipv4", .ctl_name = NET_IPV4, },
+        { .procname = "route", .ctl_name = NET_IPV4_ROUTE, },
+        { },
+};
+
+
+static struct ctl_table ipv4_route_flush_table[] = {
+        {
+                .ctl_name       = NET_IPV4_ROUTE_FLUSH,
+                .procname       = "flush",
+                .maxlen         = sizeof(int),
+                .mode           = 0200,
+                .proc_handler   = &ipv4_sysctl_rtcache_flush,
+                .strategy       = &ipv4_sysctl_rtcache_flush_strategy,
+        },
+        { .ctl_name = 0 },
+};
+
+static __net_init int sysctl_route_net_init(struct net *net)
+{
+        struct ctl_table *tbl;
+
+        tbl = ipv4_route_flush_table;
+        if (net != &init_net) {
+                tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL);
+                if (tbl == NULL)
+                        goto err_dup;
+        }
+        tbl[0].extra1 = net;
+
+        net->ipv4.route_hdr =
+                register_net_sysctl_table(net, ipv4_route_path, tbl);
+        if (net->ipv4.route_hdr == NULL)
+                goto err_reg;
+        return 0;
+
+err_reg:
+        if (tbl != ipv4_route_flush_table)
+                kfree(tbl);
+err_dup:
+        return -ENOMEM;
+}
+
+static __net_exit void sysctl_route_net_exit(struct net *net)
+{
+        struct ctl_table *tbl;
+
+        tbl = net->ipv4.route_hdr->ctl_table_arg;
+        unregister_net_sysctl_table(net->ipv4.route_hdr);
+        BUG_ON(tbl == ipv4_route_flush_table);
+        kfree(tbl);
+}
+
+static __net_initdata struct pernet_operations sysctl_route_ops = {
+        .init = sysctl_route_net_init,
+        .exit = sysctl_route_net_exit,
+};
 #endif
 
 #ifdef CONFIG_NET_CLS_ROUTE
@@ -3090,6 +3146,9 @@ int __init ip_rt_init(void)
 #endif
         rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL);
 
+#ifdef CONFIG_SYSCTL
+        register_pernet_subsys(&sysctl_route_ops);
+#endif
         return rc;
 }