1 files changed, 534 insertions, 0 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
new file mode 100644
index 000000000000..a633b5a435e2
--- /dev/null
+++ b/net/batman-adv/translation-table.c
@@ -0,0 +1,534 @@
+/*
+ * Copyright (C) 2007-2010 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 "soft-interface.h"
+#include "types.h"
+#include "hash.h"
+#include "originator.h"
+
+static void hna_local_purge(struct work_struct *work);
+static void _hna_global_del_orig(struct bat_priv *bat_priv,
+                                 struct hna_global_entry *hna_global_entry,
+                                 char *message);
+
+static void hna_local_start_timer(struct bat_priv *bat_priv)
+{
+        INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
+        queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
+}
+
+int hna_local_init(struct bat_priv *bat_priv)
+{
+        if (bat_priv->hna_local_hash)
+                return 1;
+
+        bat_priv->hna_local_hash = hash_new(1024);
+
+        if (!bat_priv->hna_local_hash)
+                return 0;
+
+        atomic_set(&bat_priv->hna_local_changed, 0);
+        hna_local_start_timer(bat_priv);
+
+        return 1;
+}
+
+void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
+{
+        struct bat_priv *bat_priv = netdev_priv(soft_iface);
+        struct hna_local_entry *hna_local_entry;
+        struct hna_global_entry *hna_global_entry;
+        int required_bytes;
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+        hna_local_entry =
+                ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
+                                                     compare_orig, choose_orig,
+                                                     addr));
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+        if (hna_local_entry) {
+                hna_local_entry->last_seen = jiffies;
+                return;
+        }
+
+        /* 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. */
+        required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
+        required_bytes += BAT_PACKET_LEN;
+
+        if ((required_bytes > ETH_DATA_LEN) ||
+            (atomic_read(&bat_priv->aggregated_ogms) &&
+             required_bytes > MAX_AGGREGATION_BYTES) ||
+            (bat_priv->num_local_hna + 1 > 255)) {
+                bat_dbg(DBG_ROUTES, bat_priv,
+                        "Can't add new local hna entry (%pM): "
+                        "number of local hna entries exceeds packet size\n",
+                        addr);
+                return;
+        }
+
+        bat_dbg(DBG_ROUTES, bat_priv,
+                "Creating new local hna entry: %pM\n", addr);
+
+        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_iface->dev_addr))
+                hna_local_entry->never_purge = 1;
+        else
+                hna_local_entry->never_purge = 0;
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+        hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
+                 hna_local_entry);
+        bat_priv->num_local_hna++;
+        atomic_set(&bat_priv->hna_local_changed, 1);
+
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+        /* remove address from global hash if present */
+        spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+        hna_global_entry = ((struct hna_global_entry *)
+                                hash_find(bat_priv->hna_global_hash,
+                                          compare_orig, choose_orig, addr));
+
+        if (hna_global_entry)
+                _hna_global_del_orig(bat_priv, hna_global_entry,
+                                     "local hna received");
+
+        spin_unlock_bh(&bat_priv->hna_ghash_lock);
+}
+
+int hna_local_fill_buffer(struct bat_priv *bat_priv,
+                          unsigned char *buff, int buff_len)
+{
+        struct hashtable_t *hash = bat_priv->hna_local_hash;
+        struct hna_local_entry *hna_local_entry;
+        struct element_t *bucket;
+        int i;
+        struct hlist_node *walk;
+        struct hlist_head *head;
+        int count = 0;
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each_entry(bucket, walk, head, hlist) {
+
+                        if (buff_len < (count + 1) * ETH_ALEN)
+                                break;
+
+                        hna_local_entry = bucket->data;
+                        memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
+                               ETH_ALEN);
+
+                        count++;
+                }
+        }
+
+        /* if we did not get all new local hnas see you next time  ;-) */
+        if (count == bat_priv->num_local_hna)
+                atomic_set(&bat_priv->hna_local_changed, 0);
+
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+        return count;
+}
+
+int hna_local_seq_print_text(struct seq_file *seq, void *offset)
+{
+        struct net_device *net_dev = (struct net_device *)seq->private;
+        struct bat_priv *bat_priv = netdev_priv(net_dev);
+        struct hashtable_t *hash = bat_priv->hna_local_hash;
+        struct hna_local_entry *hna_local_entry;
+        int i;
+        struct hlist_node *walk;
+        struct hlist_head *head;
+        struct element_t *bucket;
+        size_t buf_size, pos;
+        char *buff;
+
+        if (!bat_priv->primary_if) {
+                return seq_printf(seq, "BATMAN mesh %s disabled - "
+                               "please specify interfaces to enable it\n",
+                               net_dev->name);
+        }
+
+        seq_printf(seq, "Locally retrieved addresses (from %s) "
+                   "announced via HNA:\n",
+                   net_dev->name);
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+        buf_size = 1;
+        /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each(walk, head)
+                        buf_size += 21;
+        }
+
+        buff = kmalloc(buf_size, GFP_ATOMIC);
+        if (!buff) {
+                spin_unlock_bh(&bat_priv->hna_lhash_lock);
+                return -ENOMEM;
+        }
+        buff[0] = '\0';
+        pos = 0;
+
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each_entry(bucket, walk, head, hlist) {
+                        hna_local_entry = bucket->data;
+
+                        pos += snprintf(buff + pos, 22, " * %pM\n",
+                                        hna_local_entry->addr);
+                }
+        }
+
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+        seq_printf(seq, "%s", buff);
+        kfree(buff);
+        return 0;
+}
+
+static void _hna_local_del(void *data, void *arg)
+{
+        struct bat_priv *bat_priv = (struct bat_priv *)arg;
+
+        kfree(data);
+        bat_priv->num_local_hna--;
+        atomic_set(&bat_priv->hna_local_changed, 1);
+}
+
+static void hna_local_del(struct bat_priv *bat_priv,
+                          struct hna_local_entry *hna_local_entry,
+                          char *message)
+{
+        bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
+                hna_local_entry->addr, message);
+
+        hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
+                    hna_local_entry->addr);
+        _hna_local_del(hna_local_entry, bat_priv);
+}
+
+void hna_local_remove(struct bat_priv *bat_priv,
+                      uint8_t *addr, char *message)
+{
+        struct hna_local_entry *hna_local_entry;
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+        hna_local_entry = (struct hna_local_entry *)
+                hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
+                          addr);
+
+        if (hna_local_entry)
+                hna_local_del(bat_priv, hna_local_entry, message);
+
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+}
+
+static void hna_local_purge(struct work_struct *work)
+{
+        struct delayed_work *delayed_work =
+                container_of(work, struct delayed_work, work);
+        struct bat_priv *bat_priv =
+                container_of(delayed_work, struct bat_priv, hna_work);
+        struct hashtable_t *hash = bat_priv->hna_local_hash;
+        struct hna_local_entry *hna_local_entry;
+        int i;
+        struct hlist_node *walk, *safe;
+        struct hlist_head *head;
+        struct element_t *bucket;
+        unsigned long timeout;
+
+        spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
+                        hna_local_entry = bucket->data;
+
+                        timeout = hna_local_entry->last_seen;
+                        timeout += LOCAL_HNA_TIMEOUT * HZ;
+
+                        if ((!hna_local_entry->never_purge) &&
+                            time_after(jiffies, timeout))
+                                hna_local_del(bat_priv, hna_local_entry,
+                                        "address timed out");
+                }
+        }
+
+        spin_unlock_bh(&bat_priv->hna_lhash_lock);
+        hna_local_start_timer(bat_priv);
+}
+
+void hna_local_free(struct bat_priv *bat_priv)
+{
+        if (!bat_priv->hna_local_hash)
+                return;
+
+        cancel_delayed_work_sync(&bat_priv->hna_work);
+        hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
+        bat_priv->hna_local_hash = NULL;
+}
+
+int hna_global_init(struct bat_priv *bat_priv)
+{
+        if (bat_priv->hna_global_hash)
+                return 1;
+
+        bat_priv->hna_global_hash = hash_new(1024);
+
+        if (!bat_priv->hna_global_hash)
+                return 0;
+
+        return 1;
+}
+
+void hna_global_add_orig(struct bat_priv *bat_priv,
+                         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;
+        int hna_buff_count = 0;
+        unsigned char *hna_ptr;
+
+        while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
+                spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+                hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+                hna_global_entry = (struct hna_global_entry *)
+                        hash_find(bat_priv->hna_global_hash, compare_orig,
+                                  choose_orig, hna_ptr);
+
+                if (!hna_global_entry) {
+                        spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+                        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);
+
+                        bat_dbg(DBG_ROUTES, bat_priv,
+                                "Creating new global hna entry: "
+                                "%pM (via %pM)\n",
+                                hna_global_entry->addr, orig_node->orig);
+
+                        spin_lock_bh(&bat_priv->hna_ghash_lock);
+                        hash_add(bat_priv->hna_global_hash, compare_orig,
+                                 choose_orig, hna_global_entry);
+
+                }
+
+                hna_global_entry->orig_node = orig_node;
+                spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+                /* remove address from local hash if present */
+                spin_lock_bh(&bat_priv->hna_lhash_lock);
+
+                hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
+                hna_local_entry = (struct hna_local_entry *)
+                        hash_find(bat_priv->hna_local_hash, compare_orig,
+                                  choose_orig, hna_ptr);
+
+                if (hna_local_entry)
+                        hna_local_del(bat_priv, hna_local_entry,
+                                      "global hna received");
+
+                spin_unlock_bh(&bat_priv->hna_lhash_lock);
+
+                hna_buff_count++;
+        }
+
+        /* initialize, and overwrite if malloc succeeds */
+        orig_node->hna_buff = NULL;
+        orig_node->hna_buff_len = 0;
+
+        if (hna_buff_len > 0) {
+                orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
+                if (orig_node->hna_buff) {
+                        memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
+                        orig_node->hna_buff_len = hna_buff_len;
+                }
+        }
+}
+
+int hna_global_seq_print_text(struct seq_file *seq, void *offset)
+{
+        struct net_device *net_dev = (struct net_device *)seq->private;
+        struct bat_priv *bat_priv = netdev_priv(net_dev);
+        struct hashtable_t *hash = bat_priv->hna_global_hash;
+        struct hna_global_entry *hna_global_entry;
+        int i;
+        struct hlist_node *walk;
+        struct hlist_head *head;
+        struct element_t *bucket;
+        size_t buf_size, pos;
+        char *buff;
+
+        if (!bat_priv->primary_if) {
+                return seq_printf(seq, "BATMAN mesh %s disabled - "
+                                  "please specify interfaces to enable it\n",
+                                  net_dev->name);
+        }
+
+        seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
+                   net_dev->name);
+
+        spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+        buf_size = 1;
+        /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each(walk, head)
+                        buf_size += 43;
+        }
+
+        buff = kmalloc(buf_size, GFP_ATOMIC);
+        if (!buff) {
+                spin_unlock_bh(&bat_priv->hna_ghash_lock);
+                return -ENOMEM;
+        }
+        buff[0] = '\0';
+        pos = 0;
+
+        for (i = 0; i < hash->size; i++) {
+                head = &hash->table[i];
+
+                hlist_for_each_entry(bucket, walk, head, hlist) {
+                        hna_global_entry = bucket->data;
+
+                        pos += snprintf(buff + pos, 44,
+                                        " * %pM via %pM\n",
+                                        hna_global_entry->addr,
+                                        hna_global_entry->orig_node->orig);
+                }
+        }
+
+        spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+        seq_printf(seq, "%s", buff);
+        kfree(buff);
+        return 0;
+}
+
+static void _hna_global_del_orig(struct bat_priv *bat_priv,
+                                 struct hna_global_entry *hna_global_entry,
+                                 char *message)
+{
+        bat_dbg(DBG_ROUTES, bat_priv,
+                "Deleting global hna entry %pM (via %pM): %s\n",
+                hna_global_entry->addr, hna_global_entry->orig_node->orig,
+                message);
+
+        hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
+                    hna_global_entry->addr);
+        kfree(hna_global_entry);
+}
+
+void hna_global_del_orig(struct bat_priv *bat_priv,
+                         struct orig_node *orig_node, char *message)
+{
+        struct hna_global_entry *hna_global_entry;
+        int hna_buff_count = 0;
+        unsigned char *hna_ptr;
+
+        if (orig_node->hna_buff_len == 0)
+                return;
+
+        spin_lock_bh(&bat_priv->hna_ghash_lock);
+
+        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(bat_priv->hna_global_hash, compare_orig,
+                                  choose_orig, hna_ptr);
+
+                if ((hna_global_entry) &&
+                    (hna_global_entry->orig_node == orig_node))
+                        _hna_global_del_orig(bat_priv, hna_global_entry,
+                                             message);
+
+                hna_buff_count++;
+        }
+
+        spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+        orig_node->hna_buff_len = 0;
+        kfree(orig_node->hna_buff);
+        orig_node->hna_buff = NULL;
+}
+
+static void hna_global_del(void *data, void *arg)
+{
+        kfree(data);
+}
+
+void hna_global_free(struct bat_priv *bat_priv)
+{
+        if (!bat_priv->hna_global_hash)
+                return;
+
+        hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
+        bat_priv->hna_global_hash = NULL;
+}
+
+struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
+{
+        struct hna_global_entry *hna_global_entry;
+
+        spin_lock_bh(&bat_priv->hna_ghash_lock);
+        hna_global_entry = (struct hna_global_entry *)
+                                hash_find(bat_priv->hna_global_hash,
+                                          compare_orig, choose_orig, addr);
+        spin_unlock_bh(&bat_priv->hna_ghash_lock);
+
+        if (!hna_global_entry)
+                return NULL;
+
+        return hna_global_entry->orig_node;
+}