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>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 6ef90b5fafb351e279a007bf6913dc375ed816f2..a29adf1ba0ffae9ea20192c949658d38fc6488cc 100644 (file)
--- 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 790de32cd7d40367a05cf47294384b9bb2eddf50..6fe799de9b961b1807d4aa1e0f5d8f9fe73a13fc 100644 (file)
--- 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;
        }
 
@@ -2859,23 +2861,17 @@ 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",
@@ -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;
 }