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translation-table.c
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/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich, Antonio Quartulli
*
* 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 "hard-interface.h"
#include "send.h"
#include "hash.h"
#include "originator.h"
#include "routing.h"
#include "bridge_loop_avoidance.h"
#include "netlink.h"
#include <linux/cache.h>
#include <linux/crc16.h>
#include <linux/init.h>
#include <linux/netlink.h>
#include <linux/skbuff.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <net/sock.h>
#include "uapi/linux/batman_adv.h"
static struct kmem_cache *batadv_tl_cache __read_mostly;
static struct kmem_cache *batadv_tg_cache __read_mostly;
static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
static struct kmem_cache *batadv_tt_change_cache __read_mostly;
static struct kmem_cache *batadv_tt_req_cache __read_mostly;
static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
/* hash class keys */
static struct lock_class_key batadv_tt_local_hash_lock_class_key;
static struct lock_class_key batadv_tt_global_hash_lock_class_key;
static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
struct batadv_orig_node *orig_node);
static void batadv_tt_purge(struct work_struct *work);
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *addr,
const char *message, bool roaming);
/* returns 1 if they are the same mac addr */
static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct batadv_tt_common_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
static struct batadv_tt_common_entry *
batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
{
struct hlist_head *head;
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
uint32_t index;
if (!hash)
return NULL;
index = batadv_choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) {
if (!batadv_compare_eth(tt_common_entry, data))
continue;
if (!atomic_inc_not_zero(&tt_common_entry->refcount))
continue;
tt_common_entry_tmp = tt_common_entry;
break;
}
rcu_read_unlock();
return tt_common_entry_tmp;
}
static struct batadv_tt_local_entry *
batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_local_entry *tt_local_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
if (tt_common_entry)
tt_local_entry = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
return tt_local_entry;
}
static struct batadv_tt_global_entry *
batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_global_entry *tt_global_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
if (tt_common_entry)
tt_global_entry = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
return tt_global_entry;
}
/**
* batadv_tt_local_entry_free_rcu - free the tt_local_entry
* @rcu: rcu pointer of the tt_local_entry
*/
static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_local_entry *tt_local_entry;
tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
common.rcu);
kmem_cache_free(batadv_tl_cache, tt_local_entry);
}
static void
batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
{
if (atomic_dec_and_test(&tt_local_entry->common.refcount))
call_rcu(&tt_local_entry->common.rcu,
batadv_tt_local_entry_free_rcu);
}
static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_global_entry *tt_global_entry;
tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
tt_global_entry = container_of(tt_common_entry,
struct batadv_tt_global_entry, common);
kmem_cache_free(batadv_tg_cache, tt_global_entry);
}
static void
batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
{
if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
batadv_tt_global_del_orig_list(tt_global_entry);
call_rcu(&tt_global_entry->common.rcu,
batadv_tt_global_entry_free_rcu);
}
}
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_orig_list_entry *orig_entry;
orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
/* We are in an rcu callback here, therefore we cannot use
* batadv_orig_node_free_ref() and its call_rcu():
* An rcu_barrier() wouldn't wait for that to finish
*/
batadv_orig_node_free_ref_now(orig_entry->orig_node);
kmem_cache_free(batadv_tt_orig_cache, orig_entry);
}
static void
batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
{
if (!atomic_dec_and_test(&orig_entry->refcount))
return;
/* to avoid race conditions, immediately decrease the tt counter */
atomic_dec(&orig_entry->orig_node->tt_size);
call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
}
/**
* batadv_tt_local_event - store a local TT event (ADD/DEL)
* @bat_priv: the bat priv with all the soft interface information
* @tt_local_entry: the TT entry involved in the event
* @event_flags: flags to store in the event structure
*/
static void batadv_tt_local_event(struct batadv_priv *bat_priv,
struct batadv_tt_local_entry *tt_local_entry,
uint8_t event_flags)
{
struct batadv_tt_change_node *tt_change_node, *entry, *safe;
struct batadv_tt_common_entry *common = &tt_local_entry->common;
uint8_t flags = common->flags | event_flags;
bool event_removed = false;
bool del_op_requested, del_op_entry;
tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = flags;
memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
del_op_requested = flags & BATADV_TT_V14_CLIENT_DEL;
/* check for ADD+DEL or DEL+ADD events */
spin_lock_bh(&bat_priv->tt.changes_list_lock);
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
if (!batadv_compare_eth(entry->change.addr, common->addr))
continue;
/* DEL+ADD in the same orig interval have no effect and can be
* removed to avoid silly behaviour on the receiver side. The
* other way around (ADD+DEL) can happen in case of roaming of
* a client still in the NEW state. Roaming of NEW clients is
* now possible due to automatically recognition of "temporary"
* clients
*/
del_op_entry = entry->change.flags & BATADV_TT_V14_CLIENT_DEL;
if (!del_op_requested && del_op_entry)
goto del;
if (del_op_requested && !del_op_entry)
goto del;
continue;
del:
list_del(&entry->list);
kmem_cache_free(batadv_tt_change_cache, entry);
kmem_cache_free(batadv_tt_change_cache, tt_change_node);
event_removed = true;
goto unlock;
}
/* track the change in the OGMinterval list */
list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
unlock:
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
if (event_removed)
atomic_dec(&bat_priv->tt.local_changes);
else
atomic_inc(&bat_priv->tt.local_changes);
}
int batadv_tt_len(int changes_num)
{
return changes_num * sizeof(struct batadv_tt_change);
}
static int batadv_tt_local_init(struct batadv_priv *bat_priv)
{
if (bat_priv->tt.local_hash)
return 0;
bat_priv->tt.local_hash = batadv_hash_new(1024);
if (!bat_priv->tt.local_hash)
return -ENOMEM;
batadv_hash_set_lock_class(bat_priv->tt.local_hash,
&batadv_tt_local_hash_lock_class_key);
return 0;
}
static void batadv_tt_global_free(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global,
const char *message)
{
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting global tt entry %pM: %s\n",
tt_global->common.addr, message);
batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
batadv_choose_orig, tt_global->common.addr);
batadv_tt_global_entry_free_ref(tt_global);
}
void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
int ifindex)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_tt_local_entry *tt_local;
struct batadv_tt_global_entry *tt_global;
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry;
int hash_added;
bool roamed_back = false;
tt_local = batadv_tt_local_hash_find(bat_priv, addr);
tt_global = batadv_tt_global_hash_find(bat_priv, addr);
if (tt_local) {
tt_local->last_seen = jiffies;
if (tt_local->common.flags & BATADV_TT_V14_CLIENT_PENDING) {
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Re-adding pending client %pM\n", addr);
/* whatever the reason why the PENDING flag was set,
* this is a client which was enqueued to be removed in
* this orig_interval. Since it popped up again, the
* flag can be reset like it was never enqueued
*/
tt_local->common.flags &= ~BATADV_TT_V14_CLIENT_PENDING;
goto add_event;
}
if (tt_local->common.flags & BATADV_TT_V14_CLIENT_ROAM) {
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Roaming client %pM came back to its original location\n",
addr);
/* the ROAM flag is set because this client roamed away
* and the node got a roaming_advertisement message. Now
* that the client popped up again at its original
* location such flag can be unset
*/
tt_local->common.flags &= ~BATADV_TT_V14_CLIENT_ROAM;
roamed_back = true;
}
goto check_roaming;
}
tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
if (!tt_local)
goto out;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Creating new local tt entry: %pM (ttvn: %d)\n", addr,
(uint8_t)atomic_read(&bat_priv->tt.vn));
memcpy(tt_local->common.addr, addr, ETH_ALEN);
/* The local entry has to be marked as NEW to avoid to send it in
* a full table response going out before the next ttvn increment
* (consistency check)
*/
tt_local->common.flags = BATADV_TT_V14_CLIENT_NEW;
if (batadv_is_wifi_iface(ifindex))
tt_local->common.flags |= BATADV_TT_V14_CLIENT_WIFI;
atomic_set(&tt_local->common.refcount, 2);
tt_local->last_seen = jiffies;
tt_local->common.added_at = tt_local->last_seen;
/* the batman interface mac address should never be purged */
if (batadv_compare_eth(addr, soft_iface->dev_addr))
tt_local->common.flags |= BATADV_TT_V14_CLIENT_NOPURGE;
hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
batadv_choose_orig, &tt_local->common,
&tt_local->common.hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_local_entry_free_ref(tt_local);
goto out;
}
add_event:
batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
check_roaming:
/* Check whether it is a roaming, but don't do anything if the roaming
* process has already been handled
*/
if (tt_global && !(tt_global->common.flags & BATADV_TT_V14_CLIENT_ROAM)) {
/* These node are probably going to update their tt table */
head = &tt_global->orig_list;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_entry, head, list) {
batadv_send_roam_adv(bat_priv, tt_global->common.addr,
orig_entry->orig_node);
}
rcu_read_unlock();
if (roamed_back) {
batadv_tt_global_free(bat_priv, tt_global,
"Roaming canceled");
tt_global = NULL;
} else {
/* The global entry has to be marked as ROAMING and
* has to be kept for consistency purpose
*/
tt_global->common.flags |= BATADV_TT_V14_CLIENT_ROAM;
tt_global->roam_at = jiffies;
}
}
out:
if (tt_local)
batadv_tt_local_entry_free_ref(tt_local);
if (tt_global)
batadv_tt_global_entry_free_ref(tt_global);
}
static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len,
int new_packet_len)
{
unsigned char *new_buff;
new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
/* keep old buffer if kmalloc should fail */
if (new_buff) {
memcpy(new_buff, *packet_buff, min_packet_len);
kfree(*packet_buff);
*packet_buff = new_buff;
*packet_buff_len = new_packet_len;
}
}
static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
int req_len;
req_len = min_packet_len;
req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
/* if we have too many changes for one packet don't send any
* and wait for the tt table request which will be fragmented
*/
if (req_len > bat_priv->soft_iface->mtu)
req_len = min_packet_len;
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
min_packet_len, req_len);
}
static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct batadv_tt_change_node *entry, *safe;
int count = 0, tot_changes = 0, new_len;
unsigned char *tt_buff;
batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
packet_buff_len, min_packet_len);
new_len = *packet_buff_len - min_packet_len;
tt_buff = *packet_buff + min_packet_len;
if (new_len > 0)
tot_changes = new_len / batadv_tt_len(1);
spin_lock_bh(&bat_priv->tt.changes_list_lock);
atomic_set(&bat_priv->tt.local_changes, 0);
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
if (count < tot_changes) {
memcpy(tt_buff + batadv_tt_len(count),
&entry->change, sizeof(struct batadv_tt_change));
count++;
}
list_del(&entry->list);
kmem_cache_free(batadv_tt_change_cache, entry);
}
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
/* Keep the buffer for possible tt_request */
spin_lock_bh(&bat_priv->tt.last_changeset_lock);
kfree(bat_priv->tt.last_changeset);
bat_priv->tt.last_changeset_len = 0;
bat_priv->tt.last_changeset = NULL;
/* check whether this new OGM has no changes due to size problems */
if (new_len > 0) {
/* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
if (bat_priv->tt.last_changeset) {
memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
bat_priv->tt.last_changeset_len = new_len;
}
}
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
return count;
}
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct batadv_priv *bat_priv = netdev_priv(net_dev);
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_local_entry *tt_local;
struct batadv_hard_iface *primary_if;
struct hlist_head *head;
uint32_t i;
int last_seen_secs;
int last_seen_msecs;
unsigned long last_seen_jiffies;
bool no_purge;
uint16_t np_flag = BATADV_TT_V14_CLIENT_NOPURGE;
primary_if = batadv_seq_print_text_primary_if_get(seq);
if (!primary_if)
goto out;
seq_printf(seq,
"Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.4x):\n",
net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn),
bat_priv->tt.local_crc);
seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags",
"Last seen");
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry,
head, hash_entry) {
tt_local = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
last_seen_jiffies = jiffies - tt_local->last_seen;
last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
last_seen_secs = last_seen_msecs / 1000;
last_seen_msecs = last_seen_msecs % 1000;
no_purge = tt_common_entry->flags & np_flag;
seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n",
tt_common_entry->addr,
(tt_common_entry->flags &
BATADV_TT_V14_CLIENT_ROAM ? 'R' : '.'),
no_purge ? 'P' : '.',
(tt_common_entry->flags &
BATADV_TT_V14_CLIENT_NEW ? 'N' : '.'),
(tt_common_entry->flags &
BATADV_TT_V14_CLIENT_PENDING ? 'X' : '.'),
(tt_common_entry->flags &
BATADV_TT_V14_CLIENT_WIFI ? 'W' : '.'),
no_purge ? 0 : last_seen_secs,
no_purge ? 0 : last_seen_msecs);
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
return 0;
}
static uint16_t batadv_ttv14_to_ttnl_flag(uint16_t ttv14_flags)
{
uint16_t ttnl_flags = 0;
if (ttv14_flags & BATADV_TT_V14_CLIENT_DEL)
ttnl_flags |= BATADV_TT_CLIENT_DEL;
if (ttv14_flags & BATADV_TT_V14_CLIENT_ROAM)
ttnl_flags |= BATADV_TT_CLIENT_ROAM;
if (ttv14_flags & BATADV_TT_V14_CLIENT_WIFI)
ttnl_flags |= BATADV_TT_CLIENT_WIFI;
if (ttv14_flags & BATADV_TT_V14_CLIENT_TEMP)
ttnl_flags |= BATADV_TT_CLIENT_TEMP;
if (ttv14_flags & BATADV_TT_V14_CLIENT_NOPURGE)
ttnl_flags |= BATADV_TT_CLIENT_NOPURGE;
if (ttv14_flags & BATADV_TT_V14_CLIENT_NEW)
ttnl_flags |= BATADV_TT_CLIENT_NEW;
if (ttv14_flags & BATADV_TT_V14_CLIENT_PENDING)
ttnl_flags |= BATADV_TT_CLIENT_PENDING;
return ttnl_flags;
}
/**
* batadv_tt_local_dump_entry - Dump one TT local entry into a message
* @msg :Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @common: tt local & tt global common data
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_tt_common_entry *common)
{
void *hdr;
struct batadv_tt_local_entry *local;
unsigned int last_seen_msecs;
u32 crc;
local = container_of(common, struct batadv_tt_local_entry, common);
last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
crc = bat_priv->tt.local_crc;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI,
BATADV_CMD_GET_TRANSTABLE_LOCAL);
if (!hdr)
return -ENOBUFS;
if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
nla_put_u16(msg, BATADV_ATTR_TT_VID, 0) ||
nla_put_u32(msg, BATADV_ATTR_TT_FLAGS,
batadv_ttv14_to_ttnl_flag(common->flags)))
goto nla_put_failure;
if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @head: Pointer to the list containing the local tt entries
* @idx_s: Number of entries to skip
*
* Return: Error code, or 0 on success
*/
static int
batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct hlist_head *head, int *idx_s)
{
struct batadv_tt_common_entry *common;
int idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(common, head, hash_entry) {
if (idx++ < *idx_s)
continue;
if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
common)) {
rcu_read_unlock();
*idx_s = idx - 1;
return -EMSGSIZE;
}
}
rcu_read_unlock();
*idx_s = 0;
return 0;
}
/**
* batadv_tt_local_dump - Dump TT local entries into a message
* @msg: Netlink message to dump into
* @cb: Parameters from query
*
* Return: Error code, or 0 on success
*/
int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_hashtable *hash;
struct hlist_head *head;
int ret;
int ifindex;
int bucket = cb->args[0];
int idx = cb->args[1];
int portid = NETLINK_CB(cb->skb).portid;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
hash = bat_priv->tt.local_hash;
while (bucket < hash->size) {
head = &hash->table[bucket];
if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
bat_priv, head, &idx))
break;
bucket++;
}
ret = msg->len;
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
if (soft_iface)
dev_put(soft_iface);
cb->args[0] = bucket;
cb->args[1] = idx;
return ret;
}
static void
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
struct batadv_tt_local_entry *tt_local_entry,
uint16_t flags, const char *message)
{
batadv_tt_local_event(bat_priv, tt_local_entry, flags);
/* The local client has to be marked as "pending to be removed" but has
* to be kept in the table in order to send it in a full table
* response issued before the net ttvn increment (consistency check)
*/
tt_local_entry->common.flags |= BATADV_TT_V14_CLIENT_PENDING;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Local tt entry (%pM) pending to be removed: %s\n",
tt_local_entry->common.addr, message);
}
/**
* batadv_tt_local_remove - logically remove an entry from the local table
* @bat_priv: the bat priv with all the soft interface information
* @addr: the MAC address of the client to remove
* @message: message to append to the log on deletion
* @roaming: true if the deletion is due to a roaming event
*
* Returns the flags assigned to the local entry before being deleted
*/
uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
const uint8_t *addr, const char *message,
bool roaming)
{
struct batadv_tt_local_entry *tt_local_entry;
uint16_t flags, curr_flags = BATADV_NO_FLAGS;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (!tt_local_entry)
goto out;
curr_flags = tt_local_entry->common.flags;
flags = BATADV_TT_V14_CLIENT_DEL;
/* if this global entry addition is due to a roaming, the node has to
* mark the local entry as "roamed" in order to correctly reroute
* packets later
*/
if (roaming) {
flags |= BATADV_TT_V14_CLIENT_ROAM;
/* mark the local client as ROAMed */
tt_local_entry->common.flags |= BATADV_TT_V14_CLIENT_ROAM;
}
if (!(tt_local_entry->common.flags & BATADV_TT_V14_CLIENT_NEW)) {
batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
message);
goto out;
}
/* if this client has been added right now, it is possible to
* immediately purge it
*/
batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_V14_CLIENT_DEL);
hlist_del_rcu(&tt_local_entry->common.hash_entry);
batadv_tt_local_entry_free_ref(tt_local_entry);
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
return curr_flags;
}
static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
struct hlist_head *head)
{
struct batadv_tt_local_entry *tt_local_entry;
struct batadv_tt_common_entry *tt_common_entry;
struct hlist_node *node_tmp;
hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
hash_entry) {
tt_local_entry = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
if (tt_local_entry->common.flags & BATADV_TT_V14_CLIENT_NOPURGE)
continue;
/* entry already marked for deletion */
if (tt_local_entry->common.flags & BATADV_TT_V14_CLIENT_PENDING)
continue;
if (!batadv_has_timed_out(tt_local_entry->last_seen,
BATADV_TT_LOCAL_TIMEOUT))
continue;
batadv_tt_local_set_pending(bat_priv, tt_local_entry,
BATADV_TT_V14_CLIENT_DEL, "timed out");
}
}
static void batadv_tt_local_purge(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
uint32_t i;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
batadv_tt_local_purge_list(bat_priv, head);
spin_unlock_bh(list_lock);
}
}
static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash;
spinlock_t *list_lock; /* protects write access to the hash lists */
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_local_entry *tt_local;
struct hlist_node *node_tmp;
struct hlist_head *head;
uint32_t i;
if (!bat_priv->tt.local_hash)
return;
hash = bat_priv->tt.local_hash;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node_tmp,
head, hash_entry) {
hlist_del_rcu(&tt_common_entry->hash_entry);
tt_local = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
batadv_tt_local_entry_free_ref(tt_local);
}
spin_unlock_bh(list_lock);
}
batadv_hash_destroy(hash);
bat_priv->tt.local_hash = NULL;
}
static int batadv_tt_global_init(struct batadv_priv *bat_priv)
{
if (bat_priv->tt.global_hash)
return 0;
bat_priv->tt.global_hash = batadv_hash_new(1024);
if (!bat_priv->tt.global_hash)
return -ENOMEM;
batadv_hash_set_lock_class(bat_priv->tt.global_hash,
&batadv_tt_global_hash_lock_class_key);
return 0;
}
static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
{
struct batadv_tt_change_node *entry, *safe;
spin_lock_bh(&bat_priv->tt.changes_list_lock);
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
list_del(&entry->list);
kmem_cache_free(batadv_tt_change_cache, entry);
}
atomic_set(&bat_priv->tt.local_changes, 0);
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
}
/* retrieves the orig_tt_list_entry belonging to orig_node from the
* batadv_tt_global_entry list
*
* returns it with an increased refcounter, NULL if not found
*/
static struct batadv_tt_orig_list_entry *
batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
const struct batadv_orig_node *orig_node)
{
struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
const struct hlist_head *head;
rcu_read_lock();
head = &entry->orig_list;
hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
if (tmp_orig_entry->orig_node != orig_node)
continue;
if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
continue;
orig_entry = tmp_orig_entry;
break;
}
rcu_read_unlock();
return orig_entry;
}
/* find out if an orig_node is already in the list of a tt_global_entry.
* returns true if found, false otherwise
*/
static bool
batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
const struct batadv_orig_node *orig_node)
{
struct batadv_tt_orig_list_entry *orig_entry;
bool found = false;
orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
if (orig_entry) {
found = true;
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
return found;
}
static void
batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
struct batadv_orig_node *orig_node, int ttvn)
{
struct batadv_tt_orig_list_entry *orig_entry;
orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
if (orig_entry) {
/* refresh the ttvn: the current value could be a bogus one that
* was added during a "temporary client detection"
*/
orig_entry->ttvn = ttvn;
goto out;
}
orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
if (!orig_entry)
goto out;
INIT_HLIST_NODE(&orig_entry->list);
atomic_inc(&orig_node->refcount);
atomic_inc(&orig_node->tt_size);
orig_entry->orig_node = orig_node;
orig_entry->ttvn = ttvn;