#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/phonet.h>
+#include <linux/proc_fs.h>
+#include <linux/if_arp.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_routes {
+ struct mutex lock;
+ struct net_device *table[64];
};
+struct phonet_net {
+ struct phonet_device_list pndevs;
+ struct phonet_routes routes;
+};
+
+int phonet_net_id __read_mostly;
+
+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);
+ BUG_ON(!mutex_is_locked(&pndevs->lock));
+ list_add_rcu(&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) {
+ BUG_ON(!mutex_is_locked(&pndevs->lock));
+ list_for_each_entry(pnd, &pndevs->list, list) {
if (pnd->netdev == dev)
return pnd;
}
return NULL;
}
-static void __phonet_device_free(struct phonet_device *pnd)
+static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
{
- list_del(&pnd->list);
- kfree(pnd);
+ 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));
+ struct phonet_device *pnd;
+
+ ASSERT_RTNL();
+
+ mutex_lock(&pndevs->lock);
+ pnd = __phonet_get(dev);
+ if (pnd)
+ 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))
+ phonet_address_notify(RTM_DELADDR, dev, addr);
+ kfree(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;
+ 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);
- 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);
+ rcu_read_unlock();
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);
+ mutex_lock(&pndevs->lock);
/* Find or create Phonet-specific device data */
pnd = __phonet_get(dev);
if (pnd == NULL)
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;
}
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);
+ 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))
- __phonet_device_free(pnd);
- spin_unlock_bh(&pndevs.lock);
+ 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);
+ }
return err;
}
/* Gets a source address toward a destination, through a interface. */
-u8 phonet_address_get(struct net_device *dev, u8 addr)
+u8 phonet_address_get(struct net_device *dev, u8 daddr)
{
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));
/* Use same source address as destination, if possible */
- if (!test_bit(addr >> 2, pnd->addrs))
- addr = find_first_bit(pnd->addrs, 64) << 2;
+ if (test_bit(daddr >> 2, pnd->addrs))
+ saddr = daddr;
+ else
+ saddr = find_first_bit(pnd->addrs, 64) << 2;
} else
- addr = PN_NO_ADDR;
- spin_unlock_bh(&pndevs.lock);
- return addr;
+ saddr = PN_NO_ADDR;
+ rcu_read_unlock();
+
+ if (saddr == PN_NO_ADDR) {
+ /* Fallback to another device */
+ struct net_device *def_dev;
+
+ def_dev = phonet_device_get(dev_net(dev));
+ if (def_dev) {
+ if (def_dev != dev)
+ saddr = phonet_address_get(def_dev, daddr);
+ dev_put(def_dev);
+ }
+ }
+ return saddr;
}
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;
+ 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)
continue;
if (test_bit(addr >> 2, pnd->addrs)) {
- spin_unlock_bh(&pndevs.lock);
- return 0;
+ err = 0;
+ goto found;
+ }
+ }
+found:
+ rcu_read_unlock();
+ return err;
+}
+
+/* automatically configure a Phonet device, if supported */
+static int phonet_device_autoconf(struct net_device *dev)
+{
+ struct if_phonet_req req;
+ int ret;
+
+ if (!dev->netdev_ops->ndo_do_ioctl)
+ return -EOPNOTSUPP;
+
+ ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
+ SIOCPNGAUTOCONF);
+ if (ret < 0)
+ return ret;
+
+ ASSERT_RTNL();
+ ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
+ if (ret)
+ return ret;
+ phonet_address_notify(RTM_NEWADDR, dev,
+ req.ifr_phonet_autoconf.device);
+ 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);
}
- spin_unlock_bh(&pndevs.lock);
- return -EADDRNOTAVAIL;
}
/* notify Phonet of device events */
{
struct net_device *dev = arg;
- if (what == NETDEV_UNREGISTER) {
- struct phonet_device *pnd;
-
- /* Destroy phonet-specific device data */
- spin_lock_bh(&pndevs.lock);
- pnd = __phonet_get(dev);
- if (pnd)
- __phonet_device_free(pnd);
- spin_unlock_bh(&pndevs.lock);
+ switch (what) {
+ case NETDEV_REGISTER:
+ if (dev->type == ARPHRD_PHONET)
+ phonet_device_autoconf(dev);
+ break;
+ case NETDEV_UNREGISTER:
+ phonet_device_destroy(dev);
+ phonet_route_autodel(dev);
+ break;
}
return 0;
.priority = 0,
};
+/* Per-namespace Phonet devices handling */
+static int phonet_init_net(struct net *net)
+{
+ struct phonet_net *pnn = kzalloc(sizeof(*pnn), GFP_KERNEL);
+ if (!pnn)
+ return -ENOMEM;
+
+ if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
+ kfree(pnn);
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&pnn->pndevs.list);
+ mutex_init(&pnn->pndevs.lock);
+ mutex_init(&pnn->routes.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 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,
+};
+
/* Initialize Phonet devices list */
int __init phonet_device_init(void)
{
+ int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
+ if (err)
+ return err;
+
register_netdevice_notifier(&phonet_device_notifier);
- phonet_netlink_register();
- return 0;
+ err = phonet_netlink_register();
+ if (err)
+ phonet_device_exit();
+ return err;
}
void phonet_device_exit(void)
{
- struct phonet_device *pnd, *n;
-
rtnl_unregister_all(PF_PHONET);
- rtnl_lock();
- spin_lock_bh(&pndevs.lock);
+ unregister_netdevice_notifier(&phonet_device_notifier);
+ unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
+}
- list_for_each_entry_safe(pnd, n, &pndevs.list, list)
- __phonet_device_free(pnd);
+int phonet_route_add(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 = -EEXIST;
- spin_unlock_bh(&pndevs.lock);
- rtnl_unlock();
- unregister_netdevice_notifier(&phonet_device_notifier);
+ daddr = daddr >> 2;
+ mutex_lock(&routes->lock);
+ if (routes->table[daddr] == NULL) {
+ rcu_assign_pointer(routes->table[daddr], dev);
+ dev_hold(dev);
+ err = 0;
+ }
+ mutex_unlock(&routes->lock);
+ return err;
+}
+
+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;
+
+ daddr = daddr >> 2;
+ 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)
+{
+ struct phonet_net *pnn = net_generic(net, phonet_net_id);
+ struct phonet_routes *routes = &pnn->routes;
+ struct net_device *dev;
+
+ ASSERT_RTNL(); /* no need to hold the device */
+
+ daddr >>= 2;
+ rcu_read_lock();
+ dev = rcu_dereference(routes->table[daddr]);
+ rcu_read_unlock();
+ return dev;
+}
+
+struct net_device *phonet_route_output(struct net *net, u8 daddr)
+{
+ struct phonet_net *pnn = net_generic(net, phonet_net_id);
+ struct phonet_routes *routes = &pnn->routes;
+ struct net_device *dev;
+
+ daddr >>= 2;
+ rcu_read_lock();
+ dev = rcu_dereference(routes->table[daddr]);
+ if (dev)
+ dev_hold(dev);
+ rcu_read_unlock();
+
+ if (!dev)
+ dev = phonet_device_get(net); /* Default route */
+ return dev;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff