[NETNS][IPV6] ip6_fib - gc timer per namespace

Move the timer initialization at the network namespace creation and
store the network namespace in the timer argument.

That enables multiple timers (one per network namespace) to do garbage
collecting.
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>

include/net/ip6_route.h

@@ -78,7 +78,7 @@ extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 					 struct in6_addr *addr);
 extern int icmp6_dst_gc(int *more);
 
-extern void fib6_force_start_gc(void);
+extern void fib6_force_start_gc(struct net *net);
 
 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 					   const struct in6_addr *addr,

include/net/netns/ipv6.h

@@ -36,6 +36,7 @@ struct netns_ipv6 {
 	struct xt_table		*ip6table_mangle;
 	struct xt_table		*ip6table_raw;
 #endif
+	struct timer_list       *ip6_fib_timer;
 	struct hlist_head       *fib_table_hash;
 	struct fib6_table       *fib6_main_tbl;
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES

net/ipv6/ip6_fib.c

@@ -95,8 +95,6 @@ static __u32 rt_sernum;
 
 static void fib6_gc_timer_cb(unsigned long arg);
 
-static struct timer_list *ip6_fib_timer;
-
 static struct fib6_walker_t fib6_walker_list = {
 	.prev	= &fib6_walker_list,
 	.next	= &fib6_walker_list,
@@ -663,19 +661,19 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 	return 0;
 }
 
-static __inline__ void fib6_start_gc(struct rt6_info *rt)
+static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt)
 {
-	if (ip6_fib_timer->expires == 0 &&
+	if (net->ipv6.ip6_fib_timer->expires == 0 &&
 	    (rt->rt6i_flags & (RTF_EXPIRES|RTF_CACHE)))
-		mod_timer(ip6_fib_timer, jiffies +
-			  init_net.ipv6.sysctl.ip6_rt_gc_interval);
+		mod_timer(net->ipv6.ip6_fib_timer, jiffies +
+			  net->ipv6.sysctl.ip6_rt_gc_interval);
 }
 
-void fib6_force_start_gc(void)
+void fib6_force_start_gc(struct net *net)
 {
-	if (ip6_fib_timer->expires == 0)
-		mod_timer(ip6_fib_timer, jiffies +
-			  init_net.ipv6.sysctl.ip6_rt_gc_interval);
+	if (net->ipv6.ip6_fib_timer->expires == 0)
+		mod_timer(net->ipv6.ip6_fib_timer, jiffies +
+			  net->ipv6.sysctl.ip6_rt_gc_interval);
 }
 
 /*
@@ -762,7 +760,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info)
 	err = fib6_add_rt2node(fn, rt, info);
 
 	if (err == 0) {
-		fib6_start_gc(rt);
+		fib6_start_gc(info->nl_net, rt);
 		if (!(rt->rt6i_flags&RTF_CACHE))
 			fib6_prune_clones(pn, rt);
 	}
@@ -1443,7 +1441,7 @@ 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(net->ipv6.ip6_fib_timer, jiffies + HZ);
 			local_bh_enable();
 			return;
 		}
@@ -1456,11 +1454,11 @@ 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(net->ipv6.ip6_fib_timer, jiffies +
 			  net->ipv6.sysctl.ip6_rt_gc_interval);
 	else {
-		del_timer(ip6_fib_timer);
-		ip6_fib_timer->expires = 0;
+		del_timer(net->ipv6.ip6_fib_timer);
+		net->ipv6.ip6_fib_timer->expires = 0;
 	}
 	spin_unlock_bh(&fib6_gc_lock);
 }
@@ -1473,13 +1471,21 @@ static void fib6_gc_timer_cb(unsigned long arg)
 static int fib6_net_init(struct net *net)
 {
 	int ret;
+	struct timer_list *timer;
 
 	ret = -ENOMEM;
+	timer = kzalloc(sizeof(*timer), GFP_KERNEL);
+	if (!timer)
+		goto out;
+
+	setup_timer(timer, fib6_gc_timer_cb, (unsigned long)net);
+	net->ipv6.ip6_fib_timer = timer;
+
 	net->ipv6.fib_table_hash =
 		kzalloc(sizeof(*net->ipv6.fib_table_hash)*FIB_TABLE_HASHSZ,
 			GFP_KERNEL);
 	if (!net->ipv6.fib_table_hash)
-		goto out;
+		goto out_timer;
 
 	net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl),
 					  GFP_KERNEL);
@@ -1513,11 +1519,15 @@ static int fib6_net_init(struct net *net)
 #endif
 out_fib_table_hash:
 	kfree(net->ipv6.fib_table_hash);
+out_timer:
+	kfree(timer);
 	goto out;
  }
 
 static void fib6_net_exit(struct net *net)
 {
+	del_timer(net->ipv6.ip6_fib_timer);
+	kfree(net->ipv6.ip6_fib_timer);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 	kfree(net->ipv6.fib6_local_tbl);
 #endif
@@ -1533,6 +1543,7 @@ static struct pernet_operations fib6_net_ops = {
 int __init fib6_init(void)
 {
 	int ret = -ENOMEM;
+
 	fib6_node_kmem = kmem_cache_create("fib6_nodes",
 					   sizeof(struct fib6_node),
 					   0, SLAB_HWCACHE_ALIGN,
@@ -1540,16 +1551,9 @@ 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_timer;
+		goto out_kmem_cache_create;
 
 	ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib);
 	if (ret)
@@ -1559,8 +1563,6 @@ int __init fib6_init(void)
 
 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;
@@ -1568,8 +1570,6 @@ int __init fib6_init(void)
 
 void fib6_gc_cleanup(void)
 {
-	del_timer(ip6_fib_timer);
-	kfree(ip6_fib_timer);
 	unregister_pernet_subsys(&fib6_net_ops);
 	kmem_cache_destroy(fib6_node_kmem);
 }

net/ipv6/route.c

@@ -952,7 +952,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 	icmp6_dst_gc_list = &rt->u.dst;
 	spin_unlock_bh(&icmp6_dst_lock);
 
-	fib6_force_start_gc();
+	fib6_force_start_gc(dev->nd_net);
 
 out:
 	return &rt->u.dst;
@@ -1230,6 +1230,9 @@ int ip6_route_add(struct fib6_config *cfg)
 	rt->u.dst.dev = dev;
 	rt->rt6i_idev = idev;
 	rt->rt6i_table = table;
+
+	cfg->fc_nlinfo.nl_net = dev->nd_net;
+
 	return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
 
 out: