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Diffstat (limited to 'net/batman-adv/multicast.c')
-rw-r--r--net/batman-adv/multicast.c114
1 files changed, 84 insertions, 30 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 7aa480b7edd0..eb76386f8d4b 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -19,6 +19,8 @@
#include "main.h"
#include <linux/atomic.h>
+#include <linux/bitops.h>
+#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
@@ -29,6 +31,7 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/list.h>
+#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
@@ -87,7 +90,7 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev,
* Returns true if the given address is already in the given list.
* Otherwise returns false.
*/
-static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr,
+static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr,
struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
@@ -101,15 +104,19 @@ static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr,
/**
* batadv_mcast_mla_list_free - free a list of multicast addresses
+ * @bat_priv: the bat priv with all the soft interface information
* @mcast_list: the list to free
*
* Removes and frees all items in the given mcast_list.
*/
-static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
+static void batadv_mcast_mla_list_free(struct batadv_priv *bat_priv,
+ struct hlist_head *mcast_list)
{
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
+ lockdep_assert_held(&bat_priv->tt.commit_lock);
+
hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
hlist_del(&mcast_entry->list);
kfree(mcast_entry);
@@ -132,6 +139,8 @@ static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
+ lockdep_assert_held(&bat_priv->tt.commit_lock);
+
hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
list) {
if (mcast_list &&
@@ -162,6 +171,8 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
struct batadv_hw_addr *mcast_entry;
struct hlist_node *tmp;
+ lockdep_assert_held(&bat_priv->tt.commit_lock);
+
if (!mcast_list)
return;
@@ -266,7 +277,7 @@ update:
batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
out:
- batadv_mcast_mla_list_free(&mcast_list);
+ batadv_mcast_mla_list_free(bat_priv, &mcast_list);
}
/**
@@ -588,19 +599,28 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
*
* If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
* orig, has toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
- uint8_t mcast_flags)
+ u8 mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list;
+
+ lockdep_assert_held(&orig->mcast_handler_lock);
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_unsnoopables_node,
- &bat_priv->mcast.want_all_unsnoopables_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
@@ -608,7 +628,10 @@ static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_unsnoopables_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -621,19 +644,28 @@ static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
*
* If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
- uint8_t mcast_flags)
+ u8 mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_ipv4_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list;
+
+ lockdep_assert_held(&orig->mcast_handler_lock);
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_ipv4_node,
- &bat_priv->mcast.want_all_ipv4_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
@@ -641,7 +673,10 @@ static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_ipv4_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -654,19 +689,28 @@ static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
*
* If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
* toggled then this method updates counter and list accordingly.
+ *
+ * Caller needs to hold orig->mcast_handler_lock.
*/
static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
- uint8_t mcast_flags)
+ u8 mcast_flags)
{
+ struct hlist_node *node = &orig->mcast_want_all_ipv6_node;
+ struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list;
+
+ lockdep_assert_held(&orig->mcast_handler_lock);
+
/* switched from flag unset to set */
if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
!(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_add_head_rcu(&orig->mcast_want_all_ipv6_node,
- &bat_priv->mcast.want_all_ipv6_list);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(!hlist_unhashed(node));
+
+ hlist_add_head_rcu(node, head);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
/* switched from flag set to unset */
} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
@@ -674,7 +718,10 @@ static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
spin_lock_bh(&bat_priv->mcast.want_lists_lock);
- hlist_del_rcu(&orig->mcast_want_all_ipv6_node);
+ /* flag checks above + mcast_handler_lock prevents this */
+ WARN_ON(hlist_unhashed(node));
+
+ hlist_del_init_rcu(node);
spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
}
}
@@ -689,47 +736,50 @@ static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
*/
static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
- uint8_t flags,
+ u8 flags,
void *tvlv_value,
- uint16_t tvlv_value_len)
+ u16 tvlv_value_len)
{
bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
- uint8_t mcast_flags = BATADV_NO_FLAGS;
+ u8 mcast_flags = BATADV_NO_FLAGS;
bool orig_initialized;
- orig_initialized = orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST;
+ if (orig_mcast_enabled && tvlv_value &&
+ (tvlv_value_len >= sizeof(mcast_flags)))
+ mcast_flags = *(u8 *)tvlv_value;
+
+ spin_lock_bh(&orig->mcast_handler_lock);
+ orig_initialized = test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
+ &orig->capa_initialized);
/* If mcast support is turned on decrease the disabled mcast node
* counter only if we had increased it for this node before. If this
* is a completely new orig_node no need to decrease the counter.
*/
if (orig_mcast_enabled &&
- !(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) {
+ !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) {
if (orig_initialized)
atomic_dec(&bat_priv->mcast.num_disabled);
- orig->capabilities |= BATADV_ORIG_CAPA_HAS_MCAST;
+ set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
/* If mcast support is being switched off or if this is an initial
* OGM without mcast support then increase the disabled mcast
* node counter.
*/
} else if (!orig_mcast_enabled &&
- (orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST ||
+ (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) ||
!orig_initialized)) {
atomic_inc(&bat_priv->mcast.num_disabled);
- orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_MCAST;
+ clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities);
}
- orig->capa_initialized |= BATADV_ORIG_CAPA_HAS_MCAST;
-
- if (orig_mcast_enabled && tvlv_value &&
- (tvlv_value_len >= sizeof(mcast_flags)))
- mcast_flags = *(uint8_t *)tvlv_value;
+ set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized);
batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
orig->mcast_flags = mcast_flags;
+ spin_unlock_bh(&orig->mcast_handler_lock);
}
/**
@@ -763,11 +813,15 @@ void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
{
struct batadv_priv *bat_priv = orig->bat_priv;
- if (!(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST) &&
- orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST)
+ spin_lock_bh(&orig->mcast_handler_lock);
+
+ if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities) &&
+ test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized))
atomic_dec(&bat_priv->mcast.num_disabled);
batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
+
+ spin_unlock_bh(&orig->mcast_handler_lock);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 18:45:10 +0000