staging: 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.

This is the first submission for inclusion in staging.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 454 insertions, 0 deletions

diff --git a/drivers/staging/batman-adv/translation-table.c b/drivers/staging/batman-adv/translation-table.c
new file mode 100644
index 000000000000..c2190e177c56
--- /dev/null
+++ b/drivers/staging/batman-adv/translation-table.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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 "translation-table.h"
+#include "log.h"
+#include "soft-interface.h"
+#include "types.h"
+#include "hash.h"
+#include "compat.h"
+
+struct hashtable_t *hna_local_hash;
+static struct hashtable_t *hna_global_hash;
+atomic_t hna_local_changed;
+
+DEFINE_SPINLOCK(hna_local_hash_lock);
+static DEFINE_SPINLOCK(hna_global_hash_lock);
+
+static DECLARE_DELAYED_WORK(hna_local_purge_wq, hna_local_purge);
+
+static void hna_local_start_timer(void)
+{
+	queue_delayed_work(bat_event_workqueue, &hna_local_purge_wq, 10 * HZ);
+}
+
+int hna_local_init(void)
+{
+	if (hna_local_hash)
+		return 1;
+
+	hna_local_hash = hash_new(128, compare_orig, choose_orig);
+
+	if (!hna_local_hash)
+		return 0;
+
+	atomic_set(&hna_local_changed, 0);
+	hna_local_start_timer();
+
+	return 1;
+}
+
+void hna_local_add(uint8_t *addr)
+{
+	struct hna_local_entry *hna_local_entry;
+	struct hna_global_entry *hna_global_entry;
+	struct hashtable_t *swaphash;
+	char hna_str[ETH_STR_LEN];
+	unsigned long flags;
+
+	spin_lock_irqsave(&hna_local_hash_lock, flags);
+	hna_local_entry =
+		((struct hna_local_entry *)hash_find(hna_local_hash, addr));
+	spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+
+	if (hna_local_entry != NULL) {
+		hna_local_entry->last_seen = jiffies;
+		return;
+	}
+
+	addr_to_string(hna_str, addr);
+
+	/* only announce as many hosts as possible in the batman-packet and
+	   space in batman_packet->num_hna That also should give a limit to
+	   MAC-flooding. */
+	if ((num_hna + 1 > (ETH_DATA_LEN - BAT_PACKET_LEN) / ETH_ALEN) ||
+	    (num_hna + 1 > 255)) {
+		debug_log(LOG_TYPE_ROUTES, "Can't add new local hna entry (%s): number of local hna entries exceeds packet size \n", hna_str);
+		return;
+	}
+
+	debug_log(LOG_TYPE_ROUTES, "Creating new local hna entry: %s \n",
+		  hna_str);
+
+	hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
+	if (!hna_local_entry)
+		return;
+
+	memcpy(hna_local_entry->addr, addr, ETH_ALEN);
+	hna_local_entry->last_seen = jiffies;
+
+	/* the batman interface mac address should never be purged */
+	if (compare_orig(addr, soft_device->dev_addr))
+		hna_local_entry->never_purge = 1;
+	else
+		hna_local_entry->never_purge = 0;
+
+	spin_lock_irqsave(&hna_local_hash_lock, flags);
+
+	hash_add(hna_local_hash, hna_local_entry);
+	num_hna++;
+	atomic_set(&hna_local_changed, 1);
+
+	if (hna_local_hash->elements * 4 > hna_local_hash->size) {
+		swaphash = hash_resize(hna_local_hash,
+				       hna_local_hash->size * 2);
+
+		if (swaphash == NULL)
+			debug_log(LOG_TYPE_CRIT, "Couldn't resize local hna hash table \n");
+		else
+			hna_local_hash = swaphash;
+	}
+
+	spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+
+	/* remove address from global hash if present */
+	spin_lock_irqsave(&hna_global_hash_lock, flags);
+
+	hna_global_entry =
+		((struct hna_global_entry *)hash_find(hna_global_hash, addr));
+
+	if (hna_global_entry != NULL)
+		_hna_global_del_orig(hna_global_entry, "local hna received");
+
+	spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+}
+
+int hna_local_fill_buffer(unsigned char *buff, int buff_len)
+{
+	struct hna_local_entry *hna_local_entry;
+	struct hash_it_t *hashit = NULL;
+	int i = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hna_local_hash_lock, flags);
+
+	while (NULL != (hashit = hash_iterate(hna_local_hash, hashit))) {
+
+		if (buff_len < (i + 1) * ETH_ALEN)
+			break;
+
+		hna_local_entry = hashit->bucket->data;
+		memcpy(buff + (i * ETH_ALEN), hna_local_entry->addr, ETH_ALEN);
+
+		i++;
+	}
+
+	/* if we did not get all new local hnas see you next time  ;-) */
+	if (i == num_hna)
+		atomic_set(&hna_local_changed, 0);
+
+	spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+
+	return i;
+}
+
+int hna_local_fill_buffer_text(unsigned char *buff, int buff_len)
+{
+	struct hna_local_entry *hna_local_entry;
+	struct hash_it_t *hashit = NULL;
+	int bytes_written = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hna_local_hash_lock, flags);
+
+	while (NULL != (hashit = hash_iterate(hna_local_hash, hashit))) {
+
+		if (buff_len < bytes_written + ETH_STR_LEN + 4)
+			break;
+
+		hna_local_entry = hashit->bucket->data;
+
+		bytes_written += snprintf(buff + bytes_written, ETH_STR_LEN + 4,
+					  " * %02x:%02x:%02x:%02x:%02x:%02x\n",
+					  hna_local_entry->addr[0],
+					  hna_local_entry->addr[1],
+					  hna_local_entry->addr[2],
+					  hna_local_entry->addr[3],
+					  hna_local_entry->addr[4],
+					  hna_local_entry->addr[5]);
+	}
+
+	spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+
+	return bytes_written;
+}
+
+static void _hna_local_del(void *data)
+{
+	kfree(data);
+	num_hna--;
+	atomic_set(&hna_local_changed, 1);
+}
+
+static void hna_local_del(struct hna_local_entry *hna_local_entry,
+			  char *message)
+{
+	char hna_str[ETH_STR_LEN];
+
+	addr_to_string(hna_str, hna_local_entry->addr);
+	debug_log(LOG_TYPE_ROUTES, "Deleting local hna entry (%s): %s \n",
+		  hna_str, message);
+
+	hash_remove(hna_local_hash, hna_local_entry->addr);
+	_hna_local_del(hna_local_entry);
+}
+
+void hna_local_purge(struct work_struct *work)
+{
+	struct hna_local_entry *hna_local_entry;
+	struct hash_it_t *hashit = NULL;
+	unsigned long flags;
+	unsigned long timeout;
+
+	spin_lock_irqsave(&hna_local_hash_lock, flags);
+
+	while (NULL != (hashit = hash_iterate(hna_local_hash, hashit))) {
+		hna_local_entry = hashit->bucket->data;
+
+		timeout = hna_local_entry->last_seen +
+			((LOCAL_HNA_TIMEOUT / 1000) * HZ);
+		if ((!hna_local_entry->never_purge) &&
+		    time_after(jiffies, timeout))
+			hna_local_del(hna_local_entry, "address timed out");
+	}
+
+	spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+	hna_local_start_timer();
+}
+
+void hna_local_free(void)
+{
+	if (!hna_local_hash)
+		return;
+
+	cancel_delayed_work_sync(&hna_local_purge_wq);
+	hash_delete(hna_local_hash, _hna_local_del);
+	hna_local_hash = NULL;
+}
+
+int hna_global_init(void)
+{
+	if (hna_global_hash)
+		return 1;
+
+	hna_global_hash = hash_new(128, compare_orig, choose_orig);
+
+	if (!hna_global_hash)
+		return 0;
+
+	return 1;
+}
+
+void hna_global_add_orig(struct orig_node *orig_node,
+			 unsigned char *hna_buff, int hna_buff_len)
+{
+	struct hna_global_entry *hna_global_entry;
+	struct hna_local_entry *hna_local_entry;
+	struct hashtable_t *swaphash;
+	char hna_str[ETH_STR_LEN], orig_str[ETH_STR_LEN];
+	int hna_buff_count = 0;
+	unsigned long flags;
+	unsigned char *hna_ptr;
+
+	addr_to_string(orig_str, orig_node->orig);
+
+	while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
+		spin_lock_irqsave(&hna_global_hash_lock, flags);
+
+		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_global_entry = (struct hna_global_entry *)
+			hash_find(hna_global_hash, hna_ptr);
+
+		if (hna_global_entry == NULL) {
+			spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+
+			hna_global_entry =
+				kmalloc(sizeof(struct hna_global_entry),
+					GFP_ATOMIC);
+
+			if (!hna_global_entry)
+				break;
+
+			memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
+
+			addr_to_string(hna_str, hna_global_entry->addr);
+			debug_log(LOG_TYPE_ROUTES, "Creating new global hna entry: %s (via %s)\n", hna_str, orig_str);
+
+			spin_lock_irqsave(&hna_global_hash_lock, flags);
+			hash_add(hna_global_hash, hna_global_entry);
+
+		}
+
+		hna_global_entry->orig_node = orig_node;
+		spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+
+		/* remove address from local hash if present */
+		spin_lock_irqsave(&hna_local_hash_lock, flags);
+
+		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_local_entry = (struct hna_local_entry *)
+			hash_find(hna_local_hash, hna_ptr);
+
+		if (hna_local_entry != NULL)
+			hna_local_del(hna_local_entry, "global hna received");
+
+		spin_unlock_irqrestore(&hna_local_hash_lock, flags);
+
+		hna_buff_count++;
+	}
+
+	orig_node->hna_buff_len = hna_buff_len;
+
+	if (orig_node->hna_buff_len > 0) {
+		orig_node->hna_buff = kmalloc(orig_node->hna_buff_len,
+					      GFP_ATOMIC);
+		memcpy(orig_node->hna_buff, hna_buff, orig_node->hna_buff_len);
+	} else {
+		orig_node->hna_buff = NULL;
+	}
+
+	spin_lock_irqsave(&hna_global_hash_lock, flags);
+
+	if (hna_global_hash->elements * 4 > hna_global_hash->size) {
+		swaphash = hash_resize(hna_global_hash,
+				       hna_global_hash->size * 2);
+
+		if (swaphash == NULL)
+			debug_log(LOG_TYPE_CRIT, "Couldn't resize global hna hash table \n");
+		else
+			hna_global_hash = swaphash;
+	}
+
+	spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+}
+
+int hna_global_fill_buffer_text(unsigned char *buff, int buff_len)
+{
+	struct hna_global_entry *hna_global_entry;
+	struct hash_it_t *hashit = NULL;
+	int bytes_written = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hna_global_hash_lock, flags);
+
+	while (NULL != (hashit = hash_iterate(hna_global_hash, hashit))) {
+		if (buff_len < bytes_written + (2 * ETH_STR_LEN) + 10)
+			break;
+
+		hna_global_entry = hashit->bucket->data;
+
+		bytes_written += snprintf(buff + bytes_written,
+					  (2 * ETH_STR_LEN) + 10,
+					  " * %02x:%02x:%02x:%02x:%02x:%02x via %02x:%02x:%02x:%02x:%02x:%02x \n",
+					  hna_global_entry->addr[0],
+					  hna_global_entry->addr[1],
+					  hna_global_entry->addr[2],
+					  hna_global_entry->addr[3],
+					  hna_global_entry->addr[4],
+					  hna_global_entry->addr[5],
+					  hna_global_entry->orig_node->orig[0],
+					  hna_global_entry->orig_node->orig[1],
+					  hna_global_entry->orig_node->orig[2],
+					  hna_global_entry->orig_node->orig[3],
+					  hna_global_entry->orig_node->orig[4],
+					  hna_global_entry->orig_node->orig[5]);
+	}
+
+	spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+
+	return bytes_written;
+}
+
+void _hna_global_del_orig(struct hna_global_entry *hna_global_entry,
+			  char *message)
+{
+	char hna_str[ETH_STR_LEN], orig_str[ETH_STR_LEN];
+
+	addr_to_string(orig_str, hna_global_entry->orig_node->orig);
+	addr_to_string(hna_str, hna_global_entry->addr);
+
+	debug_log(LOG_TYPE_ROUTES, "Deleting global hna entry %s (via %s): %s \n", hna_str, orig_str, message);
+
+	hash_remove(hna_global_hash, hna_global_entry->addr);
+	kfree(hna_global_entry);
+}
+
+void hna_global_del_orig(struct orig_node *orig_node, char *message)
+{
+	struct hna_global_entry *hna_global_entry;
+	int hna_buff_count = 0;
+	unsigned long flags;
+	unsigned char *hna_ptr;
+
+	if (orig_node->hna_buff_len == 0)
+		return;
+
+	spin_lock_irqsave(&hna_global_hash_lock, flags);
+
+	while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
+		hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
+		hna_global_entry = (struct hna_global_entry *)
+			hash_find(hna_global_hash, hna_ptr);
+
+		if ((hna_global_entry != NULL) &&
+		    (hna_global_entry->orig_node == orig_node))
+			_hna_global_del_orig(hna_global_entry, message);
+
+		hna_buff_count++;
+	}
+
+	spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+
+	orig_node->hna_buff_len = 0;
+	kfree(orig_node->hna_buff);
+	orig_node->hna_buff = NULL;
+}
+
+static void hna_global_del(void *data)
+{
+	kfree(data);
+}
+
+void hna_global_free(void)
+{
+	if (!hna_global_hash)
+		return;
+
+	hash_delete(hna_global_hash, hna_global_del);
+	hna_global_hash = NULL;
+}
+
+struct orig_node *transtable_search(uint8_t *addr)
+{
+	struct hna_global_entry *hna_global_entry;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hna_global_hash_lock, flags);
+	hna_global_entry = (struct hna_global_entry *)
+		hash_find(hna_global_hash, addr);
+	spin_unlock_irqrestore(&hna_global_hash_lock, flags);
+
+	if (hna_global_entry == NULL)
+		return NULL;
+
+	return hna_global_entry->orig_node;
+}