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authorSven Eckelmann <sven@narfation.org>2010-12-13 11:19:28 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-16 13:44:24 -0800
commitc6c8fea29769d998d94fcec9b9f14d4b52b349d3 (patch)
tree2c8dc8d1a64d48c5737a5745e3c510ff53a23047 /net/batman-adv/hash.c
parentb236da6931e2482bfe44a7865dd4e7bb036f3496 (diff)
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net: Add batman-adv meshing protocol
B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing protocol for multi-hop ad-hoc mesh networks. The networks may be wired or wireless. See http://www.open-mesh.org/ for more information and user space tools. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/batman-adv/hash.c')
-rw-r--r--net/batman-adv/hash.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
new file mode 100644
index 000000000000..26e623eb9def
--- /dev/null
+++ b/net/batman-adv/hash.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "hash.h"
+
+/* clears the hash */
+static void hash_init(struct hashtable_t *hash)
+{
+ int i;
+
+ for (i = 0 ; i < hash->size; i++)
+ INIT_HLIST_HEAD(&hash->table[i]);
+}
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash)
+{
+ kfree(hash->table);
+ kfree(hash);
+}
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(int size)
+{
+ struct hashtable_t *hash;
+
+ hash = kmalloc(sizeof(struct hashtable_t) , GFP_ATOMIC);
+
+ if (!hash)
+ return NULL;
+
+ hash->size = size;
+ hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
+
+ if (!hash->table) {
+ kfree(hash);
+ return NULL;
+ }
+
+ hash_init(hash);
+
+ return hash;
+}