Phonet: use per-namespace devices list
remi.denis-courmont@nokia [Fri, 23 Jan 2009 03:00:30 +0000 (03:00 +0000)]
Signed-off-by: RĂ©mi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/phonet/pn_dev.h
net/phonet/pn_dev.c
net/phonet/pn_netlink.c

index 4ba2aed..5054dc5 100644 (file)
@@ -28,7 +28,7 @@ struct phonet_device_list {
        spinlock_t lock;
 };
 
-extern struct phonet_device_list pndevs;
+struct phonet_device_list *phonet_device_list(struct net *net);
 
 struct phonet_device {
        struct list_head list;
index 3e24c05..80a322d 100644 (file)
 #include <linux/netdevice.h>
 #include <linux/phonet.h>
 #include <net/sock.h>
+#include <net/netns/generic.h>
 #include <net/phonet/pn_dev.h>
 
-/* when accessing, remember to lock with spin_lock(&pndevs.lock); */
-struct phonet_device_list pndevs = {
-       .list = LIST_HEAD_INIT(pndevs.list),
-       .lock = __SPIN_LOCK_UNLOCKED(pndevs.lock),
+struct phonet_net {
+       struct phonet_device_list pndevs;
 };
 
+int phonet_net_id;
+
+struct phonet_device_list *phonet_device_list(struct net *net)
+{
+       struct phonet_net *pnn = net_generic(net, phonet_net_id);
+       return &pnn->pndevs;
+}
+
 /* Allocate new Phonet device. */
 static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
        struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
        if (pnd == NULL)
                return NULL;
        pnd->netdev = dev;
        bitmap_zero(pnd->addrs, 64);
 
-       list_add(&pnd->list, &pndevs.list);
+       list_add(&pnd->list, &pndevs->list);
        return pnd;
 }
 
 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;
 
-       list_for_each_entry(pnd, &pndevs.list, list) {
+       list_for_each_entry(pnd, &pndevs->list, list) {
                if (pnd->netdev == dev)
                        return pnd;
        }
@@ -68,32 +77,33 @@ static void __phonet_device_free(struct phonet_device *pnd)
 
 struct net_device *phonet_device_get(struct net *net)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(net);
        struct phonet_device *pnd;
        struct net_device *dev;
 
-       spin_lock_bh(&pndevs.lock);
-       list_for_each_entry(pnd, &pndevs.list, list) {
+       spin_lock_bh(&pndevs->lock);
+       list_for_each_entry(pnd, &pndevs->list, list) {
                dev = pnd->netdev;
                BUG_ON(!dev);
 
-               if (net_eq(dev_net(dev), net) &&
-                       (dev->reg_state == NETREG_REGISTERED) &&
+               if ((dev->reg_state == NETREG_REGISTERED) &&
                        ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
                        break;
                dev = NULL;
        }
        if (dev)
                dev_hold(dev);
-       spin_unlock_bh(&pndevs.lock);
+       spin_unlock_bh(&pndevs->lock);
        return dev;
 }
 
 int phonet_address_add(struct net_device *dev, u8 addr)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
        struct phonet_device *pnd;
        int err = 0;
 
-       spin_lock_bh(&pndevs.lock);
+       spin_lock_bh(&pndevs->lock);
        /* Find or create Phonet-specific device data */
        pnd = __phonet_get(dev);
        if (pnd == NULL)
@@ -102,31 +112,33 @@ 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);
+       spin_unlock_bh(&pndevs->lock);
        return err;
 }
 
 int phonet_address_del(struct net_device *dev, u8 addr)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
        struct phonet_device *pnd;
        int err = 0;
 
-       spin_lock_bh(&pndevs.lock);
+       spin_lock_bh(&pndevs->lock);
        pnd = __phonet_get(dev);
        if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
                err = -EADDRNOTAVAIL;
        else if (bitmap_empty(pnd->addrs, 64))
                __phonet_device_free(pnd);
-       spin_unlock_bh(&pndevs.lock);
+       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 addr)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
        struct phonet_device *pnd;
 
-       spin_lock_bh(&pndevs.lock);
+       spin_lock_bh(&pndevs->lock);
        pnd = __phonet_get(dev);
        if (pnd) {
                BUG_ON(bitmap_empty(pnd->addrs, 64));
@@ -136,30 +148,31 @@ u8 phonet_address_get(struct net_device *dev, u8 addr)
                        addr = find_first_bit(pnd->addrs, 64) << 2;
        } else
                addr = PN_NO_ADDR;
-       spin_unlock_bh(&pndevs.lock);
+       spin_unlock_bh(&pndevs->lock);
        return addr;
 }
 
 int phonet_address_lookup(struct net *net, u8 addr)
 {
+       struct phonet_device_list *pndevs = phonet_device_list(net);
        struct phonet_device *pnd;
+       int err = -EADDRNOTAVAIL;
 
-       spin_lock_bh(&pndevs.lock);
-       list_for_each_entry(pnd, &pndevs.list, list) {
-               if (!net_eq(dev_net(pnd->netdev), net))
-                       continue;
+       spin_lock_bh(&pndevs->lock);
+       list_for_each_entry(pnd, &pndevs->list, list) {
                /* Don't allow unregistering devices! */
                if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
                                ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
                        continue;
 
                if (test_bit(addr >> 2, pnd->addrs)) {
-                       spin_unlock_bh(&pndevs.lock);
-                       return 0;
+                       err = 0;
+                       goto found;
                }
        }
-       spin_unlock_bh(&pndevs.lock);
-       return -EADDRNOTAVAIL;
+found:
+       spin_unlock_bh(&pndevs->lock);
+       return err;
 }
 
 /* notify Phonet of device events */
@@ -169,14 +182,16 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
        struct net_device *dev = arg;
 
        if (what == NETDEV_UNREGISTER) {
+               struct phonet_device_list *pndevs;
                struct phonet_device *pnd;
 
                /* Destroy phonet-specific device data */
-               spin_lock_bh(&pndevs.lock);
+               pndevs = phonet_device_list(dev_net(dev));
+               spin_lock_bh(&pndevs->lock);
                pnd = __phonet_get(dev);
                if (pnd)
                        __phonet_device_free(pnd);
-               spin_unlock_bh(&pndevs.lock);
+               spin_unlock_bh(&pndevs->lock);
        }
        return 0;
 
@@ -187,10 +202,41 @@ static struct notifier_block phonet_device_notifier = {
        .priority = 0,
 };
 
+/* Per-namespace Phonet devices handling */
+static int phonet_init_net(struct net *net)
+{
+       struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL);
+       if (!pnn)
+               return -ENOMEM;
+
+       INIT_LIST_HEAD(&pnn->pndevs.list);
+       spin_lock_init(&pnn->pndevs.lock);
+       net_assign_generic(net, phonet_net_id, pnn);
+       return 0;
+}
+
+static void phonet_exit_net(struct net *net)
+{
+       struct phonet_net *pnn = net_generic(net, phonet_net_id);
+       struct phonet_device *pnd, *n;
+
+       list_for_each_entry_safe(pnd, n, &pnn->pndevs.list, list)
+               __phonet_device_free(pnd);
+
+       kfree(pnn);
+}
+
+static struct pernet_operations phonet_net_ops = {
+       .init = phonet_init_net,
+       .exit = phonet_exit_net,
+};
+
 /* Initialize Phonet devices list */
 int __init phonet_device_init(void)
 {
-       int err;
+       int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
+       if (err)
+               return err;
 
        register_netdevice_notifier(&phonet_device_notifier);
        err = phonet_netlink_register();
@@ -201,11 +247,7 @@ int __init phonet_device_init(void)
 
 void phonet_device_exit(void)
 {
-       struct phonet_device *pnd, *n;
-
        rtnl_unregister_all(PF_PHONET);
        unregister_netdevice_notifier(&phonet_device_notifier);
-
-       list_for_each_entry_safe(pnd, n, &pndevs.list, list)
-               __phonet_device_free(pnd);
+       unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
 }
index 918a4f0..1ceea1f 100644 (file)
@@ -123,17 +123,16 @@ nla_put_failure:
 
 static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 {
-       struct net *net = sock_net(skb->sk);
+       struct phonet_device_list *pndevs;
        struct phonet_device *pnd;
        int dev_idx = 0, dev_start_idx = cb->args[0];
        int addr_idx = 0, addr_start_idx = cb->args[1];
 
-       spin_lock_bh(&pndevs.lock);
-       list_for_each_entry(pnd, &pndevs.list, list) {
+       pndevs = phonet_device_list(sock_net(skb->sk));
+       spin_lock_bh(&pndevs->lock);
+       list_for_each_entry(pnd, &pndevs->list, list) {
                u8 addr;
 
-               if (!net_eq(dev_net(pnd->netdev), net))
-                       continue;
                if (dev_idx > dev_start_idx)
                        addr_start_idx = 0;
                if (dev_idx++ < dev_start_idx)
@@ -153,7 +152,7 @@ static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
        }
 
 out:
-       spin_unlock_bh(&pndevs.lock);
+       spin_unlock_bh(&pndevs->lock);
        cb->args[0] = dev_idx;
        cb->args[1] = addr_idx;