[NETNS][IPV6] ip6_fib - dynamically allocate gc-timer

The ip6_fib_timer gc timer is dynamically allocated and initialized in
the ip6 fib init function. There are no more references to a static
global variable. That will allow to make multiple instance of the
garbage collecting timer and make them per namespace.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 12 deletions

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 9b1c232a29ee..77ad1002c904 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -95,8 +95,7 @@ static __u32 rt_sernum;
 
 static void fib6_gc_timer_cb(unsigned long arg);
 
-static DEFINE_TIMER(ip6_fib_timer, fib6_gc_timer_cb, 0,
-                    (unsigned long)&init_net);
+static struct timer_list *ip6_fib_timer;
 
 static struct fib6_walker_t fib6_walker_list = {
         .prev   = &fib6_walker_list,
@@ -666,16 +665,16 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 
 static __inline__ void fib6_start_gc(struct rt6_info *rt)
 {
-        if (ip6_fib_timer.expires == 0 &&
+        if (ip6_fib_timer->expires == 0 &&
             (rt->rt6i_flags & (RTF_EXPIRES|RTF_CACHE)))
-                mod_timer(&ip6_fib_timer, jiffies +
+                mod_timer(ip6_fib_timer, jiffies +
                           init_net.ipv6.sysctl.ip6_rt_gc_interval);
 }
 
 void fib6_force_start_gc(void)
 {
-        if (ip6_fib_timer.expires == 0)
-                mod_timer(&ip6_fib_timer, jiffies +
+        if (ip6_fib_timer->expires == 0)
+                mod_timer(ip6_fib_timer, jiffies +
                           init_net.ipv6.sysctl.ip6_rt_gc_interval);
 }
 
@@ -1444,7 +1443,7 @@ void fib6_run_gc(unsigned long expires, struct net *net)
         } else {
                 local_bh_disable();
                 if (!spin_trylock(&fib6_gc_lock)) {
-                        mod_timer(&ip6_fib_timer, jiffies + HZ);
+                        mod_timer(ip6_fib_timer, jiffies + HZ);
                         local_bh_enable();
                         return;
                 }
@@ -1457,11 +1456,11 @@ void fib6_run_gc(unsigned long expires, struct net *net)
         fib6_clean_all(net, fib6_age, 0, NULL);
 
         if (gc_args.more)
-                mod_timer(&ip6_fib_timer, jiffies +
+                mod_timer(ip6_fib_timer, jiffies +
                           net->ipv6.sysctl.ip6_rt_gc_interval);
         else {
-                del_timer(&ip6_fib_timer);
-                ip6_fib_timer.expires = 0;
+                del_timer(ip6_fib_timer);
+                ip6_fib_timer->expires = 0;
         }
         spin_unlock_bh(&fib6_gc_lock);
 }
@@ -1541,9 +1540,16 @@ int __init fib6_init(void)
         if (!fib6_node_kmem)
                 goto out;
 
+        ret = -ENOMEM;
+        ip6_fib_timer = kzalloc(sizeof(*ip6_fib_timer), GFP_KERNEL);
+        if (!ip6_fib_timer)
+                goto out_kmem_cache_create;
+
+        setup_timer(ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)&init_net);
+
         ret = register_pernet_subsys(&fib6_net_ops);
         if (ret)
-                goto out_kmem_cache_create;
+                goto out_timer;
 
         ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib);
         if (ret)
@@ -1553,6 +1559,8 @@ out:
 
 out_unregister_subsys:
         unregister_pernet_subsys(&fib6_net_ops);
+out_timer:
+        kfree(ip6_fib_timer);
 out_kmem_cache_create:
         kmem_cache_destroy(fib6_node_kmem);
         goto out;
@@ -1560,7 +1568,8 @@ out_kmem_cache_create:
 
 void fib6_gc_cleanup(void)
 {
-        del_timer(&ip6_fib_timer);
+        del_timer(ip6_fib_timer);
+        kfree(ip6_fib_timer);
         unregister_pernet_subsys(&fib6_net_ops);
         kmem_cache_destroy(fib6_node_kmem);
 }