X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fphonet%2Fpn_dev.c;h=9b4ced6e0968dc99ecf198bbdfba1b4201aed0a4;hb=c2dc988ec566429841dd83644479aca78a6251e7;hp=71fffa587783213c2299e4a5a1cc1e385a4a2749;hpb=55748ac0468134a89bc55aed6a9691e320caa8a9;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c
index 71fffa5..9b4ced6 100644
--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -25,6 +25,7 @@
 
 #include <linux/kernel.h>
 #include <linux/net.h>
+#include <linux/slab.h>
 #include <linux/netdevice.h>
 #include <linux/phonet.h>
 #include <linux/proc_fs.h>
@@ -34,7 +35,7 @@
 #include <net/phonet/pn_dev.h>
 
 struct phonet_routes {
-	spinlock_t		lock;
+	struct mutex		lock;
 	struct net_device	*table[64];
 };
 
@@ -43,7 +44,7 @@ struct phonet_net {
 	struct phonet_routes routes;
 };
 
-int phonet_net_id;
+int phonet_net_id __read_mostly;
 
 struct phonet_device_list *phonet_device_list(struct net *net)
 {
@@ -61,7 +62,8 @@ static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
 	pnd->netdev = dev;
 	bitmap_zero(pnd->addrs, 64);
 
-	list_add(&pnd->list, &pndevs->list);
+	BUG_ON(!mutex_is_locked(&pndevs->lock));
+	list_add_rcu(&pnd->list, &pndevs->list);
 	return pnd;
 }
 
@@ -70,6 +72,7 @@ static struct phonet_device *__phonet_get(struct net_device *dev)
 	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
 	struct phonet_device *pnd;
 
+	BUG_ON(!mutex_is_locked(&pndevs->lock));
 	list_for_each_entry(pnd, &pndevs->list, list) {
 		if (pnd->netdev == dev)
 			return pnd;
@@ -77,6 +80,18 @@ static struct phonet_device *__phonet_get(struct net_device *dev)
 	return NULL;
 }
 
+static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
+{
+	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+	struct phonet_device *pnd;
+
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
+		if (pnd->netdev == dev)
+			return pnd;
+	}
+	return NULL;
+}
+
 static void phonet_device_destroy(struct net_device *dev)
 {
 	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
@@ -84,17 +99,16 @@ static void phonet_device_destroy(struct net_device *dev)
 
 	ASSERT_RTNL();
 
-	spin_lock_bh(&pndevs->lock);
+	mutex_lock(&pndevs->lock);
 	pnd = __phonet_get(dev);
 	if (pnd)
-		list_del(&pnd->list);
-	spin_unlock_bh(&pndevs->lock);
+		list_del_rcu(&pnd->list);
+	mutex_unlock(&pndevs->lock);
 
 	if (pnd) {
 		u8 addr;
 
-		for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
-			addr = find_next_bit(pnd->addrs, 64, 1+addr))
+		for_each_set_bit(addr, pnd->addrs, 64)
 			phonet_address_notify(RTM_DELADDR, dev, addr);
 		kfree(pnd);
 	}
@@ -106,8 +120,8 @@ struct net_device *phonet_device_get(struct net *net)
 	struct phonet_device *pnd;
 	struct net_device *dev = NULL;
 
-	spin_lock_bh(&pndevs->lock);
-	list_for_each_entry(pnd, &pndevs->list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
 		dev = pnd->netdev;
 		BUG_ON(!dev);
 
@@ -118,7 +132,7 @@ struct net_device *phonet_device_get(struct net *net)
 	}
 	if (dev)
 		dev_hold(dev);
-	spin_unlock_bh(&pndevs->lock);
+	rcu_read_unlock();
 	return dev;
 }
 
@@ -128,7 +142,7 @@ int phonet_address_add(struct net_device *dev, u8 addr)
 	struct phonet_device *pnd;
 	int err = 0;
 
-	spin_lock_bh(&pndevs->lock);
+	mutex_lock(&pndevs->lock);
 	/* Find or create Phonet-specific device data */
 	pnd = __phonet_get(dev);
 	if (pnd == NULL)
@@ -137,7 +151,7 @@ int phonet_address_add(struct net_device *dev, u8 addr)
 		err = -ENOMEM;
 	else if (test_and_set_bit(addr >> 2, pnd->addrs))
 		err = -EEXIST;
-	spin_unlock_bh(&pndevs->lock);
+	mutex_unlock(&pndevs->lock);
 	return err;
 }
 
@@ -147,27 +161,32 @@ int phonet_address_del(struct net_device *dev, u8 addr)
 	struct phonet_device *pnd;
 	int err = 0;
 
-	spin_lock_bh(&pndevs->lock);
+	mutex_lock(&pndevs->lock);
 	pnd = __phonet_get(dev);
-	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
+	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
 		err = -EADDRNOTAVAIL;
-	else if (bitmap_empty(pnd->addrs, 64)) {
-		list_del(&pnd->list);
+		pnd = NULL;
+	} else if (bitmap_empty(pnd->addrs, 64))
+		list_del_rcu(&pnd->list);
+	else
+		pnd = NULL;
+	mutex_unlock(&pndevs->lock);
+
+	if (pnd) {
+		synchronize_rcu();
 		kfree(pnd);
 	}
-	spin_unlock_bh(&pndevs->lock);
 	return err;
 }
 
 /* Gets a source address toward a destination, through a interface. */
 u8 phonet_address_get(struct net_device *dev, u8 daddr)
 {
-	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
 	struct phonet_device *pnd;
 	u8 saddr;
 
-	spin_lock_bh(&pndevs->lock);
-	pnd = __phonet_get(dev);
+	rcu_read_lock();
+	pnd = __phonet_get_rcu(dev);
 	if (pnd) {
 		BUG_ON(bitmap_empty(pnd->addrs, 64));
 
@@ -178,7 +197,7 @@ u8 phonet_address_get(struct net_device *dev, u8 daddr)
 			saddr = find_first_bit(pnd->addrs, 64) << 2;
 	} else
 		saddr = PN_NO_ADDR;
-	spin_unlock_bh(&pndevs->lock);
+	rcu_read_unlock();
 
 	if (saddr == PN_NO_ADDR) {
 		/* Fallback to another device */
@@ -200,8 +219,8 @@ int phonet_address_lookup(struct net *net, u8 addr)
 	struct phonet_device *pnd;
 	int err = -EADDRNOTAVAIL;
 
-	spin_lock_bh(&pndevs->lock);
-	list_for_each_entry(pnd, &pndevs->list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
 		/* Don't allow unregistering devices! */
 		if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
 				((pnd->netdev->flags & IFF_UP)) != IFF_UP)
@@ -213,7 +232,7 @@ int phonet_address_lookup(struct net *net, u8 addr)
 		}
 	}
 found:
-	spin_unlock_bh(&pndevs->lock);
+	rcu_read_unlock();
 	return err;
 }
 
@@ -240,6 +259,32 @@ static int phonet_device_autoconf(struct net_device *dev)
 	return 0;
 }
 
+static void phonet_route_autodel(struct net_device *dev)
+{
+	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
+	unsigned i;
+	DECLARE_BITMAP(deleted, 64);
+
+	/* Remove left-over Phonet routes */
+	bitmap_zero(deleted, 64);
+	mutex_lock(&pnn->routes.lock);
+	for (i = 0; i < 64; i++)
+		if (dev == pnn->routes.table[i]) {
+			rcu_assign_pointer(pnn->routes.table[i], NULL);
+			set_bit(i, deleted);
+		}
+	mutex_unlock(&pnn->routes.lock);
+
+	if (bitmap_empty(deleted, 64))
+		return; /* short-circuit RCU */
+	synchronize_rcu();
+	for (i = find_first_bit(deleted, 64); i < 64;
+			i = find_next_bit(deleted, 64, i + 1)) {
+		rtm_phonet_notify(RTM_DELROUTE, dev, i);
+		dev_put(dev);
+	}
+}
+
 /* notify Phonet of device events */
 static int phonet_device_notify(struct notifier_block *me, unsigned long what,
 				void *arg)
@@ -253,6 +298,7 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
 		break;
 	case NETDEV_UNREGISTER:
 		phonet_device_destroy(dev);
+		phonet_route_autodel(dev);
 		break;
 	}
 	return 0;
@@ -265,47 +311,52 @@ static struct notifier_block phonet_device_notifier = {
 };
 
 /* Per-namespace Phonet devices handling */
-static int phonet_init_net(struct net *net)
+static int __net_init phonet_init_net(struct net *net)
 {
-	struct phonet_net *pnn = kzalloc(sizeof(*pnn), GFP_KERNEL);
-	if (!pnn)
-		return -ENOMEM;
+	struct phonet_net *pnn = net_generic(net, phonet_net_id);
 
-	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
-		kfree(pnn);
+	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops))
 		return -ENOMEM;
-	}
 
 	INIT_LIST_HEAD(&pnn->pndevs.list);
-	spin_lock_init(&pnn->pndevs.lock);
-	spin_lock_init(&pnn->routes.lock);
-	net_assign_generic(net, phonet_net_id, pnn);
+	mutex_init(&pnn->pndevs.lock);
+	mutex_init(&pnn->routes.lock);
 	return 0;
 }
 
-static void phonet_exit_net(struct net *net)
+static void __net_exit phonet_exit_net(struct net *net)
 {
 	struct phonet_net *pnn = net_generic(net, phonet_net_id);
 	struct net_device *dev;
+	unsigned i;
 
 	rtnl_lock();
 	for_each_netdev(net, dev)
 		phonet_device_destroy(dev);
+
+	for (i = 0; i < 64; i++) {
+		dev = pnn->routes.table[i];
+		if (dev) {
+			rtm_phonet_notify(RTM_DELROUTE, dev, i);
+			dev_put(dev);
+		}
+	}
 	rtnl_unlock();
 
 	proc_net_remove(net, "phonet");
-	kfree(pnn);
 }
 
 static struct pernet_operations phonet_net_ops = {
 	.init = phonet_init_net,
 	.exit = phonet_exit_net,
+	.id   = &phonet_net_id,
+	.size = sizeof(struct phonet_net),
 };
 
 /* Initialize Phonet devices list */
 int __init phonet_device_init(void)
 {
-	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
+	int err = register_pernet_device(&phonet_net_ops);
 	if (err)
 		return err;
 
@@ -320,7 +371,7 @@ void phonet_device_exit(void)
 {
 	rtnl_unregister_all(PF_PHONET);
 	unregister_netdevice_notifier(&phonet_device_notifier);
-	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
+	unregister_pernet_device(&phonet_net_ops);
 }
 
 int phonet_route_add(struct net_device *dev, u8 daddr)
@@ -330,13 +381,13 @@ int phonet_route_add(struct net_device *dev, u8 daddr)
 	int err = -EEXIST;
 
 	daddr = daddr >> 2;
-	spin_lock_bh(&routes->lock);
+	mutex_lock(&routes->lock);
 	if (routes->table[daddr] == NULL) {
-		routes->table[daddr] = dev;
+		rcu_assign_pointer(routes->table[daddr], dev);
 		dev_hold(dev);
 		err = 0;
 	}
-	spin_unlock_bh(&routes->lock);
+	mutex_unlock(&routes->lock);
 	return err;
 }
 
@@ -344,17 +395,20 @@ int phonet_route_del(struct net_device *dev, u8 daddr)
 {
 	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
 	struct phonet_routes *routes = &pnn->routes;
-	int err = -ENOENT;
 
 	daddr = daddr >> 2;
-	spin_lock_bh(&routes->lock);
-	if (dev == routes->table[daddr]) {
-		routes->table[daddr] = NULL;
-		dev_put(dev);
-		err = 0;
-	}
-	spin_unlock_bh(&routes->lock);
-	return err;
+	mutex_lock(&routes->lock);
+	if (dev == routes->table[daddr])
+		rcu_assign_pointer(routes->table[daddr], NULL);
+	else
+		dev = NULL;
+	mutex_unlock(&routes->lock);
+
+	if (!dev)
+		return -ENOENT;
+	synchronize_rcu();
+	dev_put(dev);
+	return 0;
 }
 
 struct net_device *phonet_route_get(struct net *net, u8 daddr)
@@ -366,9 +420,9 @@ struct net_device *phonet_route_get(struct net *net, u8 daddr)
 	ASSERT_RTNL(); /* no need to hold the device */
 
 	daddr >>= 2;
-	spin_lock_bh(&routes->lock);
-	dev = routes->table[daddr];
-	spin_unlock_bh(&routes->lock);
+	rcu_read_lock();
+	dev = rcu_dereference(routes->table[daddr]);
+	rcu_read_unlock();
 	return dev;
 }
 
@@ -378,11 +432,12 @@ struct net_device *phonet_route_output(struct net *net, u8 daddr)
 	struct phonet_routes *routes = &pnn->routes;
 	struct net_device *dev;
 
-	spin_lock_bh(&routes->lock);
-	dev = routes->table[daddr >> 2];
+	daddr >>= 2;
+	rcu_read_lock();
+	dev = rcu_dereference(routes->table[daddr]);
 	if (dev)
 		dev_hold(dev);
-	spin_unlock_bh(&routes->lock);
+	rcu_read_unlock();
 
 	if (!dev)
 		dev = phonet_device_get(net); /* Default route */