534 lines
14 KiB
C
534 lines
14 KiB
C
/*
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* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "translation-table.h"
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#include "soft-interface.h"
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#include "types.h"
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#include "hash.h"
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#include "originator.h"
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static void hna_local_purge(struct work_struct *work);
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static void _hna_global_del_orig(struct bat_priv *bat_priv,
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struct hna_global_entry *hna_global_entry,
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char *message);
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static void hna_local_start_timer(struct bat_priv *bat_priv)
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{
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INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
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queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
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}
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int hna_local_init(struct bat_priv *bat_priv)
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{
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if (bat_priv->hna_local_hash)
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return 1;
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bat_priv->hna_local_hash = hash_new(1024);
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if (!bat_priv->hna_local_hash)
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return 0;
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atomic_set(&bat_priv->hna_local_changed, 0);
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hna_local_start_timer(bat_priv);
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return 1;
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}
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void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
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{
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struct bat_priv *bat_priv = netdev_priv(soft_iface);
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struct hna_local_entry *hna_local_entry;
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struct hna_global_entry *hna_global_entry;
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int required_bytes;
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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hna_local_entry =
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((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
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compare_orig, choose_orig,
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addr));
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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if (hna_local_entry) {
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hna_local_entry->last_seen = jiffies;
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return;
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}
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/* only announce as many hosts as possible in the batman-packet and
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space in batman_packet->num_hna That also should give a limit to
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MAC-flooding. */
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required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
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required_bytes += BAT_PACKET_LEN;
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if ((required_bytes > ETH_DATA_LEN) ||
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(atomic_read(&bat_priv->aggregated_ogms) &&
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required_bytes > MAX_AGGREGATION_BYTES) ||
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(bat_priv->num_local_hna + 1 > 255)) {
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bat_dbg(DBG_ROUTES, bat_priv,
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"Can't add new local hna entry (%pM): "
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"number of local hna entries exceeds packet size\n",
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addr);
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return;
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}
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bat_dbg(DBG_ROUTES, bat_priv,
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"Creating new local hna entry: %pM\n", addr);
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hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
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if (!hna_local_entry)
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return;
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memcpy(hna_local_entry->addr, addr, ETH_ALEN);
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hna_local_entry->last_seen = jiffies;
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/* the batman interface mac address should never be purged */
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if (compare_orig(addr, soft_iface->dev_addr))
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hna_local_entry->never_purge = 1;
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else
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hna_local_entry->never_purge = 0;
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
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hna_local_entry);
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bat_priv->num_local_hna++;
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atomic_set(&bat_priv->hna_local_changed, 1);
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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/* remove address from global hash if present */
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spin_lock_bh(&bat_priv->hna_ghash_lock);
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hna_global_entry = ((struct hna_global_entry *)
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hash_find(bat_priv->hna_global_hash,
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compare_orig, choose_orig, addr));
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if (hna_global_entry)
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_hna_global_del_orig(bat_priv, hna_global_entry,
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"local hna received");
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spin_unlock_bh(&bat_priv->hna_ghash_lock);
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}
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int hna_local_fill_buffer(struct bat_priv *bat_priv,
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unsigned char *buff, int buff_len)
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{
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struct hashtable_t *hash = bat_priv->hna_local_hash;
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struct hna_local_entry *hna_local_entry;
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struct element_t *bucket;
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int i;
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struct hlist_node *walk;
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struct hlist_head *head;
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int count = 0;
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each_entry(bucket, walk, head, hlist) {
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if (buff_len < (count + 1) * ETH_ALEN)
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break;
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hna_local_entry = bucket->data;
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memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
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ETH_ALEN);
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count++;
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}
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}
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/* if we did not get all new local hnas see you next time ;-) */
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if (count == bat_priv->num_local_hna)
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atomic_set(&bat_priv->hna_local_changed, 0);
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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return count;
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}
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int hna_local_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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struct hashtable_t *hash = bat_priv->hna_local_hash;
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struct hna_local_entry *hna_local_entry;
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int i;
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struct hlist_node *walk;
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struct hlist_head *head;
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struct element_t *bucket;
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size_t buf_size, pos;
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char *buff;
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if (!bat_priv->primary_if) {
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return seq_printf(seq, "BATMAN mesh %s disabled - "
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"please specify interfaces to enable it\n",
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net_dev->name);
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}
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seq_printf(seq, "Locally retrieved addresses (from %s) "
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"announced via HNA:\n",
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net_dev->name);
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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buf_size = 1;
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/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each(walk, head)
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buf_size += 21;
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}
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buff = kmalloc(buf_size, GFP_ATOMIC);
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if (!buff) {
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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return -ENOMEM;
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}
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buff[0] = '\0';
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pos = 0;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each_entry(bucket, walk, head, hlist) {
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hna_local_entry = bucket->data;
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pos += snprintf(buff + pos, 22, " * %pM\n",
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hna_local_entry->addr);
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}
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}
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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seq_printf(seq, "%s", buff);
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kfree(buff);
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return 0;
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}
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static void _hna_local_del(void *data, void *arg)
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{
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struct bat_priv *bat_priv = (struct bat_priv *)arg;
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kfree(data);
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bat_priv->num_local_hna--;
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atomic_set(&bat_priv->hna_local_changed, 1);
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}
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static void hna_local_del(struct bat_priv *bat_priv,
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struct hna_local_entry *hna_local_entry,
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char *message)
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{
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bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
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hna_local_entry->addr, message);
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hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
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hna_local_entry->addr);
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_hna_local_del(hna_local_entry, bat_priv);
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}
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void hna_local_remove(struct bat_priv *bat_priv,
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uint8_t *addr, char *message)
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{
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struct hna_local_entry *hna_local_entry;
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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hna_local_entry = (struct hna_local_entry *)
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hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
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addr);
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if (hna_local_entry)
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hna_local_del(bat_priv, hna_local_entry, message);
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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}
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static void hna_local_purge(struct work_struct *work)
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{
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struct delayed_work *delayed_work =
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container_of(work, struct delayed_work, work);
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struct bat_priv *bat_priv =
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container_of(delayed_work, struct bat_priv, hna_work);
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struct hashtable_t *hash = bat_priv->hna_local_hash;
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struct hna_local_entry *hna_local_entry;
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int i;
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struct hlist_node *walk, *safe;
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struct hlist_head *head;
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struct element_t *bucket;
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unsigned long timeout;
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
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hna_local_entry = bucket->data;
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timeout = hna_local_entry->last_seen;
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timeout += LOCAL_HNA_TIMEOUT * HZ;
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if ((!hna_local_entry->never_purge) &&
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time_after(jiffies, timeout))
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hna_local_del(bat_priv, hna_local_entry,
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"address timed out");
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}
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}
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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hna_local_start_timer(bat_priv);
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}
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void hna_local_free(struct bat_priv *bat_priv)
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{
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if (!bat_priv->hna_local_hash)
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return;
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cancel_delayed_work_sync(&bat_priv->hna_work);
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hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
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bat_priv->hna_local_hash = NULL;
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}
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int hna_global_init(struct bat_priv *bat_priv)
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{
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if (bat_priv->hna_global_hash)
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return 1;
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bat_priv->hna_global_hash = hash_new(1024);
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if (!bat_priv->hna_global_hash)
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return 0;
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return 1;
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}
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void hna_global_add_orig(struct bat_priv *bat_priv,
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struct orig_node *orig_node,
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unsigned char *hna_buff, int hna_buff_len)
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{
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struct hna_global_entry *hna_global_entry;
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struct hna_local_entry *hna_local_entry;
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int hna_buff_count = 0;
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unsigned char *hna_ptr;
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while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
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spin_lock_bh(&bat_priv->hna_ghash_lock);
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hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
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hna_global_entry = (struct hna_global_entry *)
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hash_find(bat_priv->hna_global_hash, compare_orig,
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choose_orig, hna_ptr);
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if (!hna_global_entry) {
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spin_unlock_bh(&bat_priv->hna_ghash_lock);
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hna_global_entry =
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kmalloc(sizeof(struct hna_global_entry),
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GFP_ATOMIC);
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if (!hna_global_entry)
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break;
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memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
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bat_dbg(DBG_ROUTES, bat_priv,
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"Creating new global hna entry: "
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"%pM (via %pM)\n",
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hna_global_entry->addr, orig_node->orig);
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spin_lock_bh(&bat_priv->hna_ghash_lock);
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hash_add(bat_priv->hna_global_hash, compare_orig,
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choose_orig, hna_global_entry);
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}
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hna_global_entry->orig_node = orig_node;
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spin_unlock_bh(&bat_priv->hna_ghash_lock);
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/* remove address from local hash if present */
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spin_lock_bh(&bat_priv->hna_lhash_lock);
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hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
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hna_local_entry = (struct hna_local_entry *)
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hash_find(bat_priv->hna_local_hash, compare_orig,
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choose_orig, hna_ptr);
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if (hna_local_entry)
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hna_local_del(bat_priv, hna_local_entry,
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"global hna received");
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spin_unlock_bh(&bat_priv->hna_lhash_lock);
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hna_buff_count++;
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}
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/* initialize, and overwrite if malloc succeeds */
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orig_node->hna_buff = NULL;
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orig_node->hna_buff_len = 0;
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if (hna_buff_len > 0) {
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orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
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if (orig_node->hna_buff) {
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memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
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orig_node->hna_buff_len = hna_buff_len;
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}
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}
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}
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int hna_global_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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struct hashtable_t *hash = bat_priv->hna_global_hash;
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struct hna_global_entry *hna_global_entry;
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int i;
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struct hlist_node *walk;
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struct hlist_head *head;
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struct element_t *bucket;
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size_t buf_size, pos;
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char *buff;
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if (!bat_priv->primary_if) {
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return seq_printf(seq, "BATMAN mesh %s disabled - "
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"please specify interfaces to enable it\n",
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net_dev->name);
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}
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seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
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net_dev->name);
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spin_lock_bh(&bat_priv->hna_ghash_lock);
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buf_size = 1;
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/* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each(walk, head)
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buf_size += 43;
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}
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buff = kmalloc(buf_size, GFP_ATOMIC);
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if (!buff) {
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spin_unlock_bh(&bat_priv->hna_ghash_lock);
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return -ENOMEM;
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}
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buff[0] = '\0';
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pos = 0;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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hlist_for_each_entry(bucket, walk, head, hlist) {
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hna_global_entry = bucket->data;
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pos += snprintf(buff + pos, 44,
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" * %pM via %pM\n",
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hna_global_entry->addr,
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hna_global_entry->orig_node->orig);
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}
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}
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spin_unlock_bh(&bat_priv->hna_ghash_lock);
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seq_printf(seq, "%s", buff);
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kfree(buff);
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return 0;
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}
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static void _hna_global_del_orig(struct bat_priv *bat_priv,
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struct hna_global_entry *hna_global_entry,
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char *message)
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{
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bat_dbg(DBG_ROUTES, bat_priv,
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"Deleting global hna entry %pM (via %pM): %s\n",
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hna_global_entry->addr, hna_global_entry->orig_node->orig,
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message);
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hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
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hna_global_entry->addr);
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kfree(hna_global_entry);
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}
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void hna_global_del_orig(struct bat_priv *bat_priv,
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struct orig_node *orig_node, char *message)
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{
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struct hna_global_entry *hna_global_entry;
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int hna_buff_count = 0;
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unsigned char *hna_ptr;
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if (orig_node->hna_buff_len == 0)
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return;
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spin_lock_bh(&bat_priv->hna_ghash_lock);
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while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
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hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
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hna_global_entry = (struct hna_global_entry *)
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hash_find(bat_priv->hna_global_hash, compare_orig,
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choose_orig, hna_ptr);
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if ((hna_global_entry) &&
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(hna_global_entry->orig_node == orig_node))
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_hna_global_del_orig(bat_priv, hna_global_entry,
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message);
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hna_buff_count++;
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}
|
|
|
|
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;
|
|
}
|