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Commit 8814c4b5 authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki Committed by David S. Miller
Browse files

[IPV6] ADDRCONF: Convert addrconf_lock to RCU. 



Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fbea49e1

include/net/addrconf.h

+4 −6
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -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

+2 −2
Original line number Diff line number Diff line
@@ -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

+24 −22
Original line number Diff line number Diff line
@@ -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

+2 −2
Original line number Diff line number Diff line
@@ -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;

}