diff options
Diffstat (limited to 'net/batman-adv/hard-interface.c')
| -rw-r--r-- | net/batman-adv/hard-interface.c | 79 |
1 files changed, 57 insertions, 22 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 01acccc4d218..b22b2775a0a5 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -18,6 +18,7 @@ #include "hard-interface.h" #include "main.h" +#include <linux/atomic.h> #include <linux/bug.h> #include <linux/byteorder/generic.h> #include <linux/errno.h> @@ -26,6 +27,7 @@ #include <linux/if_ether.h> #include <linux/if.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/netdevice.h> #include <linux/printk.h> @@ -47,13 +49,19 @@ #include "sysfs.h" #include "translation-table.h" -void batadv_hardif_free_rcu(struct rcu_head *rcu) +/** + * batadv_hardif_release - release hard interface from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the hard interface + */ +void batadv_hardif_release(struct kref *ref) { struct batadv_hard_iface *hard_iface; - hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); + hard_iface = container_of(ref, struct batadv_hard_iface, refcount); dev_put(hard_iface->net_dev); - kfree(hard_iface); + + kfree_rcu(hard_iface, rcu); } struct batadv_hard_iface * @@ -64,7 +72,7 @@ batadv_hardif_get_by_netdev(const struct net_device *net_dev) rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { if (hard_iface->net_dev == net_dev && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -76,6 +84,28 @@ out: } /** + * batadv_mutual_parents - check if two devices are each others parent + * @dev1: 1st net_device + * @dev2: 2nd net_device + * + * veth devices come in pairs and each is the parent of the other! + * + * Return: true if the devices are each others parent, otherwise false + */ +static bool batadv_mutual_parents(const struct net_device *dev1, + const struct net_device *dev2) +{ + int dev1_parent_iflink = dev_get_iflink(dev1); + int dev2_parent_iflink = dev_get_iflink(dev2); + + if (!dev1_parent_iflink || !dev2_parent_iflink) + return false; + + return (dev1_parent_iflink == dev2->ifindex) && + (dev2_parent_iflink == dev1->ifindex); +} + +/** * batadv_is_on_batman_iface - check if a device is a batman iface descendant * @net_dev: the device to check * @@ -85,7 +115,7 @@ out: * This function recursively checks all the fathers of the device passed as * argument looking for a batman-adv soft interface. * - * Returns true if the device is descendant of a batman-adv mesh interface (or + * Return: true if the device is descendant of a batman-adv mesh interface (or * if it is a batman-adv interface itself), false otherwise */ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) @@ -108,6 +138,9 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) if (WARN(!parent_dev, "Cannot find parent device")) return false; + if (batadv_mutual_parents(net_dev, parent_dev)) + return false; + ret = batadv_is_on_batman_iface(parent_dev); return ret; @@ -136,7 +169,7 @@ static int batadv_is_valid_iface(const struct net_device *net_dev) * interface * @net_device: the device to check * - * Returns true if the net device is a 802.11 wireless device, false otherwise. + * Return: true if the net device is a 802.11 wireless device, false otherwise. */ bool batadv_is_wifi_netdev(struct net_device *net_device) { @@ -169,7 +202,7 @@ batadv_hardif_get_active(const struct net_device *soft_iface) continue; if (hard_iface->if_status == BATADV_IF_ACTIVE && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -193,7 +226,7 @@ static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, batadv_bla_update_orig_address(bat_priv, primary_if, oldif); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void batadv_primary_if_select(struct batadv_priv *bat_priv, @@ -203,7 +236,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, ASSERT_RTNL(); - if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) + if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount)) new_hard_iface = NULL; curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); @@ -217,7 +250,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, out: if (curr_hard_iface) - batadv_hardif_free_ref(curr_hard_iface); + batadv_hardif_put(curr_hard_iface); } static bool @@ -376,7 +409,7 @@ batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void @@ -401,7 +434,8 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) * * Invoke ndo_del_slave on master passing slave as argument. In this way slave * is free'd and master can correctly change its internal state. - * Return 0 on success, a negative value representing the error otherwise + * + * Return: 0 on success, a negative value representing the error otherwise */ static int batadv_master_del_slave(struct batadv_hard_iface *slave, struct net_device *master) @@ -430,7 +464,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) + if (!kref_get_unless_zero(&hard_iface->refcount)) goto out; soft_iface = dev_get_by_name(&init_net, iface_name); @@ -528,7 +562,7 @@ err_dev: hard_iface->soft_iface = NULL; dev_put(soft_iface); err: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } @@ -559,7 +593,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, batadv_primary_if_select(bat_priv, new_if); if (new_if) - batadv_hardif_free_ref(new_if); + batadv_hardif_put(new_if); } bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); @@ -582,11 +616,11 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, } hard_iface->soft_iface = NULL; - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** @@ -605,7 +639,7 @@ static void batadv_hardif_remove_interface_finish(struct work_struct *work) batadv_debugfs_del_hardif(hard_iface); batadv_sysfs_del_hardif(&hard_iface->hardif_obj); - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); } static struct batadv_hard_iface * @@ -651,7 +685,8 @@ batadv_hardif_add_interface(struct net_device *net_dev) hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; /* extra reference for return */ - atomic_set(&hard_iface->refcount, 2); + kref_init(&hard_iface->refcount); + kref_get(&hard_iface->refcount); batadv_check_known_mac_addr(hard_iface->net_dev); list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); @@ -759,10 +794,10 @@ static int batadv_hard_if_event(struct notifier_block *this, } hardif_put: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return NOTIFY_DONE; } |