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Merge tag 'batadv-next-for-davem-20161119' of git://git.open-mesh.org/linux-merge

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Simon Wunderlich says:

====================
This feature patchset includes the following changes:

 - 6 patches adding functionality to detect a WiFi interface under
   other virtual interfaces, like VLANs. They introduce a cache for
   the detected the WiFi configuration to avoid RTNL locking in
   critical sections. Patches have been prepared by Marek Lindner
   and Sven Eckelmann

 - Enable automatic module loading for genl requests, by Sven Eckelmann

 - Fix a potential race condition on interface removal. This is not
   happening very often in practice, but requires bigger changes to fix,
   so we are sending this to net-next. By Linus Luessing
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2016-11-19 11:13:05 -05:00
parent 5a21388126 9b4aec647a
commit f463c99b20
9 changed files with 446 additions and 116 deletions
Download Patch File Download Diff File Expand all files Collapse all files

173
net/batman-adv/hard-interface.c
View File

@@ -92,8 +92,8 @@ out:
*
* Return: result of rtnl_link_ops->get_link_net or @fallback_net
*/
static const struct net *batadv_getlink_net(const struct net_device *netdev,
const struct net *fallback_net)
static struct net *batadv_getlink_net(const struct net_device *netdev,
struct net *fallback_net)
{
if (!netdev->rtnl_link_ops)
return fallback_net;
@@ -116,9 +116,9 @@ static const struct net *batadv_getlink_net(const struct net_device *netdev,
* Return: true if the devices are each others parent, otherwise false
*/
static bool batadv_mutual_parents(const struct net_device *dev1,
const struct net *net1,
struct net *net1,
const struct net_device *dev2,
const struct net *net2)
struct net *net2)
{
int dev1_parent_iflink = dev_get_iflink(dev1);
int dev2_parent_iflink = dev_get_iflink(dev2);
@@ -154,7 +154,7 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
{
struct net *net = dev_net(net_dev);
struct net_device *parent_dev;
const struct net *parent_net;
struct net *parent_net;
bool ret;
/* check if this is a batman-adv mesh interface */
@@ -202,13 +202,77 @@ static bool batadv_is_valid_iface(const struct net_device *net_dev)
}
/**
* batadv_is_wifi_netdev - check if the given net_device struct is a wifi
* interface
* batadv_get_real_netdevice - check if the given netdev struct is a virtual
* interface on top of another 'real' interface
* @netdev: the device to check
*
* Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev()
* instead of this.
*
* Return: the 'real' net device or the original net device and NULL in case
* of an error.
*/
static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
{
struct batadv_hard_iface *hard_iface = NULL;
struct net_device *real_netdev = NULL;
struct net *real_net;
struct net *net;
int ifindex;
ASSERT_RTNL();
if (!netdev)
return NULL;
if (netdev->ifindex == dev_get_iflink(netdev)) {
dev_hold(netdev);
return netdev;
}
hard_iface = batadv_hardif_get_by_netdev(netdev);
if (!hard_iface || !hard_iface->soft_iface)
goto out;
net = dev_net(hard_iface->soft_iface);
ifindex = dev_get_iflink(netdev);
real_net = batadv_getlink_net(netdev, net);
real_netdev = dev_get_by_index(real_net, ifindex);
out:
if (hard_iface)
batadv_hardif_put(hard_iface);
return real_netdev;
}
/**
* batadv_get_real_netdev - check if the given net_device struct is a virtual
* interface on top of another 'real' interface
* @net_device: the device to check
*
* Return: true if the net device is a 802.11 wireless device, false otherwise.
* Return: the 'real' net device or the original net device and NULL in case
* of an error.
*/
bool batadv_is_wifi_netdev(struct net_device *net_device)
struct net_device *batadv_get_real_netdev(struct net_device *net_device)
{
struct net_device *real_netdev;
rtnl_lock();
real_netdev = batadv_get_real_netdevice(net_device);
rtnl_unlock();
return real_netdev;
}
/**
* batadv_is_wext_netdev - check if the given net_device struct is a
* wext wifi interface
* @net_device: the device to check
*
* Return: true if the net device is a wext wireless device, false
* otherwise.
*/
static bool batadv_is_wext_netdev(struct net_device *net_device)
{
if (!net_device)
return false;
@@ -221,6 +285,22 @@ bool batadv_is_wifi_netdev(struct net_device *net_device)
return true;
#endif
return false;
}
/**
* batadv_is_cfg80211_netdev - check if the given net_device struct is a
* cfg80211 wifi interface
* @net_device: the device to check
*
* Return: true if the net device is a cfg80211 wireless device, false
* otherwise.
*/
static bool batadv_is_cfg80211_netdev(struct net_device *net_device)
{
if (!net_device)
return false;
/* cfg80211 drivers have to set ieee80211_ptr */
if (net_device->ieee80211_ptr)
return true;
@@ -228,6 +308,73 @@ bool batadv_is_wifi_netdev(struct net_device *net_device)
return false;
}
/**
* batadv_wifi_flags_evaluate - calculate wifi flags for net_device
* @net_device: the device to check
*
* Return: batadv_hard_iface_wifi_flags flags of the device
*/
static u32 batadv_wifi_flags_evaluate(struct net_device *net_device)
{
u32 wifi_flags = 0;
struct net_device *real_netdev;
if (batadv_is_wext_netdev(net_device))
wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT;
if (batadv_is_cfg80211_netdev(net_device))
wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
real_netdev = batadv_get_real_netdevice(net_device);
if (!real_netdev)
return wifi_flags;
if (real_netdev == net_device)
goto out;
if (batadv_is_wext_netdev(real_netdev))
wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT;
if (batadv_is_cfg80211_netdev(real_netdev))
wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
out:
dev_put(real_netdev);
return wifi_flags;
}
/**
* batadv_is_cfg80211_hardif - check if the given hardif is a cfg80211 wifi
* interface
* @hard_iface: the device to check
*
* Return: true if the net device is a cfg80211 wireless device, false
* otherwise.
*/
bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface)
{
u32 allowed_flags = 0;
allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT;
allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT;
return !!(hard_iface->wifi_flags & allowed_flags);
}
/**
* batadv_is_wifi_hardif - check if the given hardif is a wifi interface
* @hard_iface: the device to check
*
* Return: true if the net device is a 802.11 wireless device, false otherwise.
*/
bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface)
{
if (!hard_iface)
return false;
return hard_iface->wifi_flags != 0;
}
/**
* batadv_hardif_no_broadcast - check whether (re)broadcast is necessary
* @if_outgoing: the outgoing interface checked and considered for (re)broadcast
@@ -748,7 +895,8 @@ batadv_hardif_add_interface(struct net_device *net_dev)
kref_init(&hard_iface->refcount);
hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
if (batadv_is_wifi_netdev(net_dev))
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
if (batadv_is_wifi_hardif(hard_iface))
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
batadv_v_hardif_init(hard_iface);
@@ -857,6 +1005,11 @@ static int batadv_hard_if_event(struct notifier_block *this,
if (hard_iface == primary_if)
batadv_primary_if_update_addr(bat_priv, NULL);
break;
case NETDEV_CHANGEUPPER:
hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev);
if (batadv_is_wifi_hardif(hard_iface))
hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
break;
default:
break;
}