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authorLinus Torvalds <torvalds@linux-foundation.org>2010-04-06 08:34:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-04-06 08:34:06 -0700
commitcb4361c1dc29cd870f664c004b1817106fbce0fa (patch)
treec31533210d738c9074b21b8f31fe0399b39545f0 /net/netlabel/netlabel_unlabeled.c
parent309361e09ca9e9670dc8664e5d14125bf82078af (diff)
parentfb9e2d887243499b8d28efcf80821c4f6a092395 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (37 commits) smc91c92_cs: fix the problem of "Unable to find hardware address" r8169: clean up my printk uglyness net: Hook up cxgb4 to Kconfig and Makefile cxgb4: Add main driver file and driver Makefile cxgb4: Add remaining driver headers and L2T management cxgb4: Add packet queues and packet DMA code cxgb4: Add HW and FW support code cxgb4: Add register, message, and FW definitions netlabel: Fix several rcu_dereference() calls used without RCU read locks bonding: fix potential deadlock in bond_uninit() net: check the length of the socket address passed to connect(2) stmmac: add documentation for the driver. stmmac: fix kconfig for crc32 build error be2net: fix bug in vlan rx path for big endian architecture be2net: fix flashing on big endian architectures be2net: fix a bug in flashing the redboot section bonding: bond_xmit_roundrobin() fix drivers/net: Add missing unlock net: gianfar - align BD ring size console messages net: gianfar - initialize per-queue statistics ...
Diffstat (limited to 'net/netlabel/netlabel_unlabeled.c')
-rw-r--r--net/netlabel/netlabel_unlabeled.c66
1 files changed, 19 insertions, 47 deletions
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index d7ea2cf390b7..a3d64aabe2f7 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -115,6 +115,9 @@ struct netlbl_unlhsh_walk_arg {
/* updates should be so rare that having one spinlock for the entire
* hash table should be okay */
static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
+#define netlbl_unlhsh_rcu_deref(p) \
+ rcu_dereference_check(p, rcu_read_lock_held() || \
+ lockdep_is_held(&netlbl_unlhsh_lock))
static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
@@ -236,15 +239,13 @@ static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
* Description:
* This is the hashing function for the unlabeled hash table, it returns the
* bucket number for the given device/interface. The caller is responsible for
- * calling the rcu_read_[un]lock() functions.
+ * ensuring that the hash table is protected with either a RCU read lock or
+ * the hash table lock.
*
*/
static u32 netlbl_unlhsh_hash(int ifindex)
{
- /* this is taken _almost_ directly from
- * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much
- * the same thing */
- return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1);
+ return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
}
/**
@@ -254,7 +255,8 @@ static u32 netlbl_unlhsh_hash(int ifindex)
* Description:
* Searches the unlabeled connection hash table and returns a pointer to the
* interface entry which matches @ifindex, otherwise NULL is returned. The
- * caller is responsible for calling the rcu_read_[un]lock() functions.
+ * caller is responsible for ensuring that the hash table is protected with
+ * either a RCU read lock or the hash table lock.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
@@ -264,7 +266,7 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
struct netlbl_unlhsh_iface *iter;
bkt = netlbl_unlhsh_hash(ifindex);
- bkt_list = &rcu_dereference(netlbl_unlhsh)->tbl[bkt];
+ bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
list_for_each_entry_rcu(iter, bkt_list, list)
if (iter->valid && iter->ifindex == ifindex)
return iter;
@@ -273,33 +275,6 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
}
/**
- * netlbl_unlhsh_search_iface_def - Search for a matching interface entry
- * @ifindex: the network interface
- *
- * Description:
- * Searches the unlabeled connection hash table and returns a pointer to the
- * interface entry which matches @ifindex. If an exact match can not be found
- * and there is a valid default entry, the default entry is returned, otherwise
- * NULL is returned. The caller is responsible for calling the
- * rcu_read_[un]lock() functions.
- *
- */
-static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
-{
- struct netlbl_unlhsh_iface *entry;
-
- entry = netlbl_unlhsh_search_iface(ifindex);
- if (entry != NULL)
- return entry;
-
- entry = rcu_dereference(netlbl_unlhsh_def);
- if (entry != NULL && entry->valid)
- return entry;
-
- return NULL;
-}
-
-/**
* netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
* @iface: the associated interface entry
* @addr: IPv4 address in network byte order
@@ -309,8 +284,7 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
* Description:
* Add a new address entry into the unlabeled connection hash table using the
* interface entry specified by @iface. On success zero is returned, otherwise
- * a negative value is returned. The caller is responsible for calling the
- * rcu_read_[un]lock() functions.
+ * a negative value is returned.
*
*/
static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
@@ -350,8 +324,7 @@ static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
* Description:
* Add a new address entry into the unlabeled connection hash table using the
* interface entry specified by @iface. On success zero is returned, otherwise
- * a negative value is returned. The caller is responsible for calling the
- * rcu_read_[un]lock() functions.
+ * a negative value is returned.
*
*/
static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
@@ -392,8 +365,7 @@ static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
* Description:
* Add a new, empty, interface entry into the unlabeled connection hash table.
* On success a pointer to the new interface entry is returned, on failure NULL
- * is returned. The caller is responsible for calling the rcu_read_[un]lock()
- * functions.
+ * is returned.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
@@ -416,10 +388,10 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
if (netlbl_unlhsh_search_iface(ifindex) != NULL)
goto add_iface_failure;
list_add_tail_rcu(&iface->list,
- &rcu_dereference(netlbl_unlhsh)->tbl[bkt]);
+ &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
} else {
INIT_LIST_HEAD(&iface->list);
- if (rcu_dereference(netlbl_unlhsh_def) != NULL)
+ if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
goto add_iface_failure;
rcu_assign_pointer(netlbl_unlhsh_def, iface);
}
@@ -549,8 +521,7 @@ unlhsh_add_return:
*
* Description:
* Remove an IP address entry from the unlabeled connection hash table.
- * Returns zero on success, negative values on failure. The caller is
- * responsible for calling the rcu_read_[un]lock() functions.
+ * Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlhsh_remove_addr4(struct net *net,
@@ -612,8 +583,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
*
* Description:
* Remove an IP address entry from the unlabeled connection hash table.
- * Returns zero on success, negative values on failure. The caller is
- * responsible for calling the rcu_read_[un]lock() functions.
+ * Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlhsh_remove_addr6(struct net *net,
@@ -1548,8 +1518,10 @@ int netlbl_unlabel_getattr(const struct sk_buff *skb,
struct netlbl_unlhsh_iface *iface;
rcu_read_lock();
- iface = netlbl_unlhsh_search_iface_def(skb->skb_iif);
+ iface = netlbl_unlhsh_search_iface(skb->skb_iif);
if (iface == NULL)
+ iface = rcu_dereference(netlbl_unlhsh_def);
+ if (iface == NULL || !iface->valid)
goto unlabel_getattr_nolabel;
switch (family) {
case PF_INET: {