};
/* Domain hash table */
-/* XXX - updates should be so rare that having one spinlock for the entire
- * hash table should be okay */
+/* updates should be so rare that having one spinlock for the entire hash table
+ * should be okay */
static DEFINE_SPINLOCK(netlbl_domhsh_lock);
+#define netlbl_domhsh_rcu_deref(p) \
+ rcu_dereference_check(p, rcu_read_lock_held() || \
+ lockdep_is_held(&netlbl_domhsh_lock))
static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL;
static struct netlbl_dom_map *netlbl_domhsh_def = NULL;
* Description:
* This is the hashing function for the domain hash table, it returns the
* correct bucket number for the domain. The caller is responsibile 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_domhsh_hash(const char *key)
for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
- return val & (rcu_dereference(netlbl_domhsh)->size - 1);
+ return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
}
/**
* Description:
* Searches the domain hash table and returns a pointer to the hash table
* entry if found, otherwise NULL is returned. The caller is responsibile for
- * the rcu hash table locks (i.e. the caller much call rcu_read_[un]lock()).
+ * ensuring that the hash table is protected with either a RCU read lock or the
+ * hash table lock.
*
*/
static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain)
if (domain != NULL) {
bkt = netlbl_domhsh_hash(domain);
- bkt_list = &rcu_dereference(netlbl_domhsh)->tbl[bkt];
+ bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
list_for_each_entry_rcu(iter, bkt_list, list)
if (iter->valid && strcmp(iter->domain, domain) == 0)
return iter;
* Searches the domain hash table and returns a pointer to the hash table
* entry if an exact match is found, if an exact match is not present in the
* hash table then the default entry is returned if valid otherwise NULL is
- * returned. The caller is responsibile for the rcu hash table locks
- * (i.e. the caller much call rcu_read_[un]lock()).
+ * returned. The caller is responsibile ensuring that the hash table is
+ * protected with either a RCU read lock or the hash table lock.
*
*/
static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain)
entry = netlbl_domhsh_search(domain);
if (entry == NULL) {
- entry = rcu_dereference(netlbl_domhsh_def);
+ entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def);
if (entry != NULL && !entry->valid)
entry = NULL;
}
struct netlbl_af6list *tmp6;
#endif /* IPv6 */
+ /* XXX - we can remove this RCU read lock as the spinlock protects the
+ * entire function, but before we do we need to fixup the
+ * netlbl_af[4,6]list RCU functions to do "the right thing" with
+ * respect to rcu_dereference() when only a spinlock is held. */
rcu_read_lock();
-
spin_lock(&netlbl_domhsh_lock);
if (entry->domain != NULL)
entry_old = netlbl_domhsh_search(entry->domain);
/* 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;
* 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);
}
/**
* 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)
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;
}
/**
- * 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
* 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,
* 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,
* 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)
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);
}
*
* 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,
*
* 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,
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: {
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff