[IPV6] ADDRCONF: Convert addrconf_lock to RCU.

Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/addrconf.h

@@ -133,20 +133,18 @@ extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 static inline struct inet6_dev *
 __in6_dev_get(struct net_device *dev)
 {
-	return (struct inet6_dev *)dev->ip6_ptr;
+	return rcu_dereference(dev->ip6_ptr);
 }
 
-extern rwlock_t addrconf_lock;
-
 static inline struct inet6_dev *
 in6_dev_get(struct net_device *dev)
 {
 	struct inet6_dev *idev = NULL;
-	read_lock(&addrconf_lock);
-	idev = dev->ip6_ptr;
+	rcu_read_lock();
+	idev = __in6_dev_get(dev);
 	if (idev)
 		atomic_inc(&idev->refcnt);
-	read_unlock(&addrconf_lock);
+	rcu_read_unlock();
 	return idev;
 }
 

include/net/if_inet6.h

@@ -189,6 +189,7 @@ struct inet6_dev
 	struct ipv6_devconf	cnf;
 	struct ipv6_devstat	stats;
 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
+	struct rcu_head		rcu;
 };
 
 extern struct ipv6_devconf ipv6_devconf;

net/core/pktgen.c

@@ -1786,7 +1786,7 @@ static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
 			 * use ipv6_get_lladdr if/when it's get exported
 			 */
 
-			read_lock(&addrconf_lock);
+			rcu_read_lock();
 			if ((idev = __in6_dev_get(pkt_dev->odev)) != NULL) {
 				struct inet6_ifaddr *ifp;
 
@@ -1805,7 +1805,7 @@ static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
 				}
 				read_unlock_bh(&idev->lock);
 			}
-			read_unlock(&addrconf_lock);
+			rcu_read_unlock();
 			if (err)
 				printk("pktgen: ERROR: IPv6 link address not availble.\n");
 		}

net/ipv6/addrconf.c

@@ -119,9 +119,6 @@ static int ipv6_count_addresses(struct inet6_dev *idev);
 static struct inet6_ifaddr		*inet6_addr_lst[IN6_ADDR_HSIZE];
 static DEFINE_RWLOCK(addrconf_hash_lock);
 
-/* Protects inet6 devices */
-DEFINE_RWLOCK(addrconf_lock);
-
 static void addrconf_verify(unsigned long);
 
 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
@@ -318,6 +315,12 @@ static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 
 /* Nobody refers to this device, we may destroy it. */
 
+static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
+{
+	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
+	kfree(idev);
+}
+
 void in6_dev_finish_destroy(struct inet6_dev *idev)
 {
 	struct net_device *dev = idev->dev;
@@ -332,7 +335,7 @@ void in6_dev_finish_destroy(struct inet6_dev *idev)
 		return;
 	}
 	snmp6_free_dev(idev);
-	kfree(idev);
+	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 }
 
 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
@@ -408,9 +411,8 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 	if (netif_carrier_ok(dev))
 		ndev->if_flags |= IF_READY;
 
-	write_lock_bh(&addrconf_lock);
-	dev->ip6_ptr = ndev;
-	write_unlock_bh(&addrconf_lock);
+	/* protected by rtnl_lock */
+	rcu_assign_pointer(dev->ip6_ptr, ndev);
 
 	ipv6_mc_init_dev(ndev);
 	ndev->tstamp = jiffies;
@@ -474,7 +476,7 @@ static void addrconf_forward_change(void)
 
 	read_lock(&dev_base_lock);
 	for (dev=dev_base; dev; dev=dev->next) {
-		read_lock(&addrconf_lock);
+		rcu_read_lock();
 		idev = __in6_dev_get(dev);
 		if (idev) {
 			int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
@@ -482,7 +484,7 @@ static void addrconf_forward_change(void)
 			if (changed)
 				dev_forward_change(idev);
 		}
-		read_unlock(&addrconf_lock);
+		rcu_read_unlock();
 	}
 	read_unlock(&dev_base_lock);
 }
@@ -543,7 +545,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 	int hash;
 	int err = 0;
 
-	read_lock_bh(&addrconf_lock);
+	rcu_read_lock_bh();
 	if (idev->dead) {
 		err = -ENODEV;			/*XXX*/
 		goto out2;
@@ -612,7 +614,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 	in6_ifa_hold(ifa);
 	write_unlock(&idev->lock);
 out2:
-	read_unlock_bh(&addrconf_lock);
+	rcu_read_unlock_bh();
 
 	if (likely(err == 0))
 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
@@ -915,7 +917,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 	memset(&hiscore, 0, sizeof(hiscore));
 
 	read_lock(&dev_base_lock);
-	read_lock(&addrconf_lock);
+	rcu_read_lock();
 
 	for (dev = dev_base; dev; dev=dev->next) {
 		struct inet6_dev *idev;
@@ -1127,7 +1129,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 		}
 		read_unlock_bh(&idev->lock);
 	}
-	read_unlock(&addrconf_lock);
+	rcu_read_unlock();
 	read_unlock(&dev_base_lock);
 
 	if (!ifa_result)
@@ -1151,7 +1153,7 @@ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 	struct inet6_dev *idev;
 	int err = -EADDRNOTAVAIL;
 
-	read_lock(&addrconf_lock);
+	rcu_read_lock();
 	if ((idev = __in6_dev_get(dev)) != NULL) {
 		struct inet6_ifaddr *ifp;
 
@@ -1165,7 +1167,7 @@ int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
 		}
 		read_unlock_bh(&idev->lock);
 	}
-	read_unlock(&addrconf_lock);
+	rcu_read_unlock();
 	return err;
 }
 
@@ -1466,7 +1468,7 @@ static void ipv6_regen_rndid(unsigned long data)
 	struct inet6_dev *idev = (struct inet6_dev *) data;
 	unsigned long expires;
 
-	read_lock_bh(&addrconf_lock);
+	rcu_read_lock_bh();
 	write_lock_bh(&idev->lock);
 
 	if (idev->dead)
@@ -1490,7 +1492,7 @@ static void ipv6_regen_rndid(unsigned long data)
 
 out:
 	write_unlock_bh(&idev->lock);
-	read_unlock_bh(&addrconf_lock);
+	rcu_read_unlock_bh();
 	in6_dev_put(idev);
 }
 
@@ -2342,10 +2344,10 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	           Do not dev_put!
 	 */
 	if (how == 1) {
-		write_lock_bh(&addrconf_lock);
-		dev->ip6_ptr = NULL;
 		idev->dead = 1;
-		write_unlock_bh(&addrconf_lock);
+
+		/* protected by rtnl_lock */
+		rcu_assign_pointer(dev->ip6_ptr, NULL);
 
 		/* Step 1.5: remove snmp6 entry */
 		snmp6_unregister_dev(idev);
@@ -3573,10 +3575,10 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 
 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
 {
-	read_lock_bh(&addrconf_lock);
+	rcu_read_lock_bh();
 	if (likely(ifp->idev->dead == 0))
 		__ipv6_ifa_notify(event, ifp);
-	read_unlock_bh(&addrconf_lock);
+	rcu_read_unlock_bh();
 }
 
 #ifdef CONFIG_SYSCTL

net/ipv6/anycast.c

@@ -56,7 +56,7 @@ ip6_onlink(struct in6_addr *addr, struct net_device *dev)
 	int	onlink;
 
 	onlink = 0;
-	read_lock(&addrconf_lock);
+	rcu_read_lock();
 	idev = __in6_dev_get(dev);
 	if (idev) {
 		read_lock_bh(&idev->lock);
@@ -68,7 +68,7 @@ ip6_onlink(struct in6_addr *addr, struct net_device *dev)
 		}
 		read_unlock_bh(&idev->lock);
 	}
-	read_unlock(&addrconf_lock);
+	rcu_read_unlock();
 	return onlink;
 }
 

net/ipv6/ipv6_syms.c

@@ -14,7 +14,6 @@ EXPORT_SYMBOL(ndisc_mc_map);
 EXPORT_SYMBOL(register_inet6addr_notifier);
 EXPORT_SYMBOL(unregister_inet6addr_notifier);
 EXPORT_SYMBOL(ip6_route_output);
-EXPORT_SYMBOL(addrconf_lock);
 EXPORT_SYMBOL(ipv6_setsockopt);
 EXPORT_SYMBOL(ipv6_getsockopt);
 EXPORT_SYMBOL(inet6_register_protosw);

net/sctp/ipv6.c

@@ -321,9 +321,9 @@ static void sctp_v6_copy_addrlist(struct list_head *addrlist,
 	struct inet6_ifaddr *ifp;
 	struct sctp_sockaddr_entry *addr;
 
-	read_lock(&addrconf_lock);
+	rcu_read_lock();
 	if ((in6_dev = __in6_dev_get(dev)) == NULL) {
-		read_unlock(&addrconf_lock);
+		rcu_read_unlock();
 		return;
 	}
 
@@ -342,7 +342,7 @@ static void sctp_v6_copy_addrlist(struct list_head *addrlist,
 	}
 
 	read_unlock(&in6_dev->lock);
-	read_unlock(&addrconf_lock);
+	rcu_read_unlock();
 }
 
 /* Initialize a sockaddr_storage from in incoming skb. */