Staging: batman-adv: Split originator handling parts out of routing.c

Bug found and fixed in origional version by Linus Luessing.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Linus Luessing <linus.luessing@web.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 243 insertions, 0 deletions

diff --git a/drivers/staging/batman-adv/originator.c b/drivers/staging/batman-adv/originator.c
new file mode 100644
index 00000000000..9962af7ae64
--- /dev/null
+++ b/drivers/staging/batman-adv/originator.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 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
+ *
+ */
+
+/* increase the reference counter for this originator */
+
+#include "main.h"
+#include "originator.h"
+#include "hash.h"
+#include "translation-table.h"
+#include "routing.h"
+
+
+static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig);
+
+static void start_purge_timer(void)
+{
+	queue_delayed_work(bat_event_workqueue, &purge_orig_wq, 1 * HZ);
+}
+
+int originator_init(void)
+{
+	if (orig_hash)
+		return 1;
+
+	spin_lock(&orig_hash_lock);
+	orig_hash = hash_new(128, compare_orig, choose_orig);
+
+	if (!orig_hash)
+		goto err;
+
+	spin_unlock(&orig_hash_lock);
+	start_purge_timer();
+	return 1;
+
+err:
+	spin_unlock(&orig_hash_lock);
+	return 0;
+}
+
+void originator_free(void)
+{
+	if (!orig_hash)
+		return;
+
+	cancel_delayed_work_sync(&purge_orig_wq);
+
+	spin_lock(&orig_hash_lock);
+	hash_delete(orig_hash, free_orig_node);
+	orig_hash = NULL;
+	spin_unlock(&orig_hash_lock);
+}
+
+struct neigh_node *
+create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
+		uint8_t *neigh, struct batman_if *if_incoming)
+{
+	struct neigh_node *neigh_node;
+
+	bat_dbg(DBG_BATMAN, "Creating new last-hop neighbour of originator\n");
+
+	neigh_node = kmalloc(sizeof(struct neigh_node), GFP_ATOMIC);
+	memset(neigh_node, 0, sizeof(struct neigh_node));
+	INIT_LIST_HEAD(&neigh_node->list);
+
+	memcpy(neigh_node->addr, neigh, ETH_ALEN);
+	neigh_node->orig_node = orig_neigh_node;
+	neigh_node->if_incoming = if_incoming;
+
+	list_add_tail(&neigh_node->list, &orig_node->neigh_list);
+	return neigh_node;
+}
+
+void free_orig_node(void *data)
+{
+	struct list_head *list_pos, *list_pos_tmp;
+	struct neigh_node *neigh_node;
+	struct orig_node *orig_node = (struct orig_node *)data;
+
+	/* for all neighbours towards this originator ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
+		neigh_node = list_entry(list_pos, struct neigh_node, list);
+
+		list_del(list_pos);
+		kfree(neigh_node);
+	}
+
+	hna_global_del_orig(orig_node, "originator timed out");
+
+	kfree(orig_node->bcast_own);
+	kfree(orig_node->bcast_own_sum);
+	kfree(orig_node);
+}
+
+/* this function finds or creates an originator entry for the given
+ * address if it does not exits */
+struct orig_node *get_orig_node(uint8_t *addr)
+{
+	struct orig_node *orig_node;
+	struct hashtable_t *swaphash;
+	char orig_str[ETH_STR_LEN];
+	int size;
+
+	orig_node = ((struct orig_node *)hash_find(orig_hash, addr));
+
+	if (orig_node != NULL)
+		return orig_node;
+
+	addr_to_string(orig_str, addr);
+	bat_dbg(DBG_BATMAN, "Creating new originator: %s \n", orig_str);
+
+	orig_node = kmalloc(sizeof(struct orig_node), GFP_ATOMIC);
+	memset(orig_node, 0, sizeof(struct orig_node));
+	INIT_LIST_HEAD(&orig_node->neigh_list);
+
+	memcpy(orig_node->orig, addr, ETH_ALEN);
+	orig_node->router = NULL;
+	orig_node->batman_if = NULL;
+	orig_node->hna_buff = NULL;
+
+	size = num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS;
+
+	orig_node->bcast_own = kmalloc(size, GFP_ATOMIC);
+	memset(orig_node->bcast_own, 0, size);
+
+	size = num_ifs * sizeof(uint8_t);
+	orig_node->bcast_own_sum = kmalloc(size, GFP_ATOMIC);
+	memset(orig_node->bcast_own_sum, 0, size);
+
+	hash_add(orig_hash, orig_node);
+
+	if (orig_hash->elements * 4 > orig_hash->size) {
+		swaphash = hash_resize(orig_hash, orig_hash->size * 2);
+
+		if (swaphash == NULL)
+			printk(KERN_ERR
+			       "batman-adv:Couldn't resize orig hash table \n");
+		else
+			orig_hash = swaphash;
+	}
+
+	return orig_node;
+}
+
+static bool purge_orig_neigbours(struct orig_node *orig_node,
+				 struct neigh_node **best_neigh_node)
+{
+	struct list_head *list_pos, *list_pos_tmp;
+	char neigh_str[ETH_STR_LEN], orig_str[ETH_STR_LEN];
+	struct neigh_node *neigh_node;
+	bool neigh_purged = false;
+
+	*best_neigh_node = NULL;
+
+
+	/* for all neighbours towards this originator ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) {
+		neigh_node = list_entry(list_pos, struct neigh_node, list);
+
+		if (time_after(jiffies,
+			       (neigh_node->last_valid +
+				((PURGE_TIMEOUT * HZ) / 1000)))) {
+
+			addr_to_string(neigh_str, neigh_node->addr);
+			addr_to_string(orig_str, orig_node->orig);
+			bat_dbg(DBG_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %lu\n", orig_str, neigh_str, (neigh_node->last_valid / HZ));
+
+			neigh_purged = true;
+			list_del(list_pos);
+			kfree(neigh_node);
+		} else {
+			if ((*best_neigh_node == NULL) ||
+			    (neigh_node->tq_avg > (*best_neigh_node)->tq_avg))
+				*best_neigh_node = neigh_node;
+		}
+	}
+	return neigh_purged;
+}
+
+
+static bool purge_orig_node(struct orig_node *orig_node)
+{
+	struct neigh_node *best_neigh_node;
+	char orig_str[ETH_STR_LEN];
+
+	addr_to_string(orig_str, orig_node->orig);
+
+	if (time_after(jiffies,
+		       (orig_node->last_valid +
+			((2 * PURGE_TIMEOUT * HZ) / 1000)))) {
+
+		bat_dbg(DBG_BATMAN,
+			"Originator timeout: originator %s, last_valid %lu\n",
+			orig_str, (orig_node->last_valid / HZ));
+		return true;
+	} else {
+		if (purge_orig_neigbours(orig_node, &best_neigh_node))
+			update_routes(orig_node, best_neigh_node,
+				      orig_node->hna_buff,
+				      orig_node->hna_buff_len);
+	}
+	return false;
+}
+
+void purge_orig(struct work_struct *work)
+{
+	struct hash_it_t *hashit = NULL;
+	struct orig_node *orig_node;
+
+	spin_lock(&orig_hash_lock);
+
+	/* for all origins... */
+	while (NULL != (hashit = hash_iterate(orig_hash, hashit))) {
+		orig_node = hashit->bucket->data;
+		if (purge_orig_node(orig_node)) {
+			hash_remove_bucket(orig_hash, hashit);
+			free_orig_node(orig_node);
+		}
+	}
+
+	spin_unlock(&orig_hash_lock);
+
+	start_purge_timer();
+}
+
+