blob: 0b43e86328a59bb42f7200380b840b0209fd26a1 [file] [log] [blame]
/* Copyright (C) 2007-2016 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, see <http://www.gnu.org/licenses/>.
*/
#include "translation-table.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/compiler.h>
#include <linux/crc32c.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/net_namespace.h>
#include "bridge_loop_avoidance.h"
#include "hard-interface.h"
#include "hash.h"
#include "multicast.h"
#include "originator.h"
#include "packet.h"
#include "soft-interface.h"
/* 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, u8 *client,
unsigned short vid,
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,
unsigned short vid, const char *message,
bool roaming);
/**
* batadv_compare_tt - check if two TT entries are the same
* @node: the list element pointer of the first TT entry
* @data2: pointer to the tt_common_entry of the second TT entry
*
* Compare the MAC address and the VLAN ID of the two TT entries and check if
* they are the same TT client.
* Return: 1 if the two TT clients are the same, 0 otherwise
*/
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);
const struct batadv_tt_common_entry *tt1 = data1;
const struct batadv_tt_common_entry *tt2 = data2;
return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
}
/**
* batadv_choose_tt - return the index of the tt entry in the hash table
* @data: pointer to the tt_common_entry object to map
* @size: the size of the hash table
*
* Return: the hash index where the object represented by 'data' should be
* stored at.
*/
static inline u32 batadv_choose_tt(const void *data, u32 size)
{
struct batadv_tt_common_entry *tt;
u32 hash = 0;
tt = (struct batadv_tt_common_entry *)data;
hash = jhash(&tt->addr, ETH_ALEN, hash);
hash = jhash(&tt->vid, sizeof(tt->vid), hash);
return hash % size;
}
/**
* batadv_tt_hash_find - look for a client in the given hash table
* @hash: the hash table to search
* @addr: the mac address of the client to look for
* @vid: VLAN identifier
*
* Return: a pointer to the tt_common struct belonging to the searched client if
* found, NULL otherwise.
*/
static struct batadv_tt_common_entry *
batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
unsigned short vid)
{
struct hlist_head *head;
struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
u32 index;
if (!hash)
return NULL;
ether_addr_copy(to_search.addr, addr);
to_search.vid = vid;
index = batadv_choose_tt(&to_search, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt, head, hash_entry) {
if (!batadv_compare_eth(tt, addr))
continue;
if (tt->vid != vid)
continue;
if (!kref_get_unless_zero(&tt->refcount))
continue;
tt_tmp = tt;
break;
}
rcu_read_unlock();
return tt_tmp;
}
/**
* batadv_tt_local_hash_find - search the local table for a given client
* @bat_priv: the bat priv with all the soft interface information
* @addr: the mac address of the client to look for
* @vid: VLAN identifier
*
* Return: a pointer to the corresponding tt_local_entry struct if the client is
* found, NULL otherwise.
*/
static struct batadv_tt_local_entry *
batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
unsigned short vid)
{
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, addr,
vid);
if (tt_common_entry)
tt_local_entry = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
return tt_local_entry;
}
/**
* batadv_tt_global_hash_find - search the global table for a given client
* @bat_priv: the bat priv with all the soft interface information
* @addr: the mac address of the client to look for
* @vid: VLAN identifier
*
* Return: a pointer to the corresponding tt_global_entry struct if the client
* is found, NULL otherwise.
*/
static struct batadv_tt_global_entry *
batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
unsigned short vid)
{
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, addr,
vid);
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_release - release tt_local_entry from lists and queue
* for free after rcu grace period
* @ref: kref pointer of the nc_node
*/
static void batadv_tt_local_entry_release(struct kref *ref)
{
struct batadv_tt_local_entry *tt_local_entry;
tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
common.refcount);
kfree_rcu(tt_local_entry, common.rcu);
}
/**
* batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
* possibly release it
* @tt_local_entry: tt_local_entry to be free'd
*/
static void
batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
{
kref_put(&tt_local_entry->common.refcount,
batadv_tt_local_entry_release);
}
/**
* batadv_tt_global_entry_release - release tt_global_entry from lists and queue
* for free after rcu grace period
* @ref: kref pointer of the nc_node
*/
static void batadv_tt_global_entry_release(struct kref *ref)
{
struct batadv_tt_global_entry *tt_global_entry;
tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
common.refcount);
batadv_tt_global_del_orig_list(tt_global_entry);
kfree_rcu(tt_global_entry, common.rcu);
}
/**
* batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
* possibly release it
* @tt_global_entry: tt_global_entry to be free'd
*/
static void
batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
{
kref_put(&tt_global_entry->common.refcount,
batadv_tt_global_entry_release);
}
/**
* batadv_tt_global_hash_count - count the number of orig entries
* @bat_priv: the bat priv with all the soft interface information
* @addr: the mac address of the client to count entries for
* @vid: VLAN identifier
*
* Return: the number of originators advertising the given address/data
* (excluding ourself).
*/
int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
const u8 *addr, unsigned short vid)
{
struct batadv_tt_global_entry *tt_global_entry;
int count;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (!tt_global_entry)
return 0;
count = atomic_read(&tt_global_entry->orig_list_count);
batadv_tt_global_entry_put(tt_global_entry);
return count;
}
/**
* batadv_tt_local_size_mod - change the size by v of the local table identified
* by vid
* @bat_priv: the bat priv with all the soft interface information
* @vid: the VLAN identifier of the sub-table to change
* @v: the amount to sum to the local table size
*/
static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
unsigned short vid, int v)
{
struct batadv_softif_vlan *vlan;
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (!vlan)
return;
atomic_add(v, &vlan->tt.num_entries);
batadv_softif_vlan_put(vlan);
}
/**
* batadv_tt_local_size_inc - increase by one the local table size for the given
* vid
* @bat_priv: the bat priv with all the soft interface information
* @vid: the VLAN identifier
*/
static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
unsigned short vid)
{
batadv_tt_local_size_mod(bat_priv, vid, 1);
}
/**
* batadv_tt_local_size_dec - decrease by one the local table size for the given
* vid
* @bat_priv: the bat priv with all the soft interface information
* @vid: the VLAN identifier
*/
static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
unsigned short vid)
{
batadv_tt_local_size_mod(bat_priv, vid, -1);
}
/**
* batadv_tt_global_size_mod - change the size by v of the global table
* for orig_node identified by vid
* @orig_node: the originator for which the table has to be modified
* @vid: the VLAN identifier
* @v: the amount to sum to the global table size
*/
static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
unsigned short vid, int v)
{
struct batadv_orig_node_vlan *vlan;
vlan = batadv_orig_node_vlan_new(orig_node, vid);
if (!vlan)
return;
if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
spin_lock_bh(&orig_node->vlan_list_lock);
if (!hlist_unhashed(&vlan->list)) {
hlist_del_init_rcu(&vlan->list);
batadv_orig_node_vlan_put(vlan);
}
spin_unlock_bh(&orig_node->vlan_list_lock);
}
batadv_orig_node_vlan_put(vlan);
}
/**
* batadv_tt_global_size_inc - increase by one the global table size for the
* given vid
* @orig_node: the originator which global table size has to be decreased
* @vid: the vlan identifier
*/
static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
unsigned short vid)
{
batadv_tt_global_size_mod(orig_node, vid, 1);
}
/**
* batadv_tt_global_size_dec - decrease by one the global table size for the
* given vid
* @orig_node: the originator which global table size has to be decreased
* @vid: the vlan identifier
*/
static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
unsigned short vid)
{
batadv_tt_global_size_mod(orig_node, vid, -1);
}
/**
* batadv_tt_orig_list_entry_release - release tt orig entry from lists and
* queue for free after rcu grace period
* @ref: kref pointer of the tt orig entry
*/
static void batadv_tt_orig_list_entry_release(struct kref *ref)
{
struct batadv_tt_orig_list_entry *orig_entry;
orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
refcount);
batadv_orig_node_put(orig_entry->orig_node);
kfree_rcu(orig_entry, rcu);
}
/**
* batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
* possibly release it
* @orig_entry: tt orig entry to be free'd
*/
static void
batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
{
kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
}
/**
* 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,
u8 event_flags)
{
struct batadv_tt_change_node *tt_change_node, *entry, *safe;
struct batadv_tt_common_entry *common = &tt_local_entry->common;
u8 flags = common->flags | event_flags;
bool event_removed = false;
bool del_op_requested, del_op_entry;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = flags;
memset(tt_change_node->change.reserved, 0,
sizeof(tt_change_node->change.reserved));
ether_addr_copy(tt_change_node->change.addr, common->addr);
tt_change_node->change.vid = htons(common->vid);
del_op_requested = flags & BATADV_TT_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_CLIENT_DEL;
if (!del_op_requested && del_op_entry)
goto del;
if (del_op_requested && !del_op_entry)
goto del;
/* this is a second add in the same originator interval. It
* means that flags have been changed: update them!
*/
if (!del_op_requested && !del_op_entry)
entry->change.flags = flags;
continue;
del:
list_del(&entry->list);
kfree(entry);
kfree(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);
}
/**
* batadv_tt_len - compute length in bytes of given number of tt changes
* @changes_num: number of tt changes
*
* Return: computed length in bytes.
*/
static int batadv_tt_len(int changes_num)
{
return changes_num * sizeof(struct batadv_tvlv_tt_change);
}
/**
* batadv_tt_entries - compute the number of entries fitting in tt_len bytes
* @tt_len: available space
*
* Return: the number of entries.
*/
static u16 batadv_tt_entries(u16 tt_len)
{
return tt_len / batadv_tt_len(1);
}
/**
* batadv_tt_local_table_transmit_size - calculates the local translation table
* size when transmitted over the air
* @bat_priv: the bat priv with all the soft interface information
*
* Return: local translation table size in bytes.
*/
static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
{
u16 num_vlan = 0;
u16 tt_local_entries = 0;
struct batadv_softif_vlan *vlan;
int hdr_size;
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
num_vlan++;
tt_local_entries += atomic_read(&vlan->tt.num_entries);
}
rcu_read_unlock();
/* header size of tvlv encapsulated tt response payload */
hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
hdr_size += sizeof(struct batadv_tvlv_hdr);
hdr_size += sizeof(struct batadv_tvlv_tt_data);
hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
return hdr_size + batadv_tt_len(tt_local_entries);
}
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 (vid: %d): %s\n",
tt_global->common.addr,
BATADV_PRINT_VID(tt_global->common.vid), message);
batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
batadv_choose_tt, &tt_global->common);
batadv_tt_global_entry_put(tt_global);
}
/**
* batadv_tt_local_add - add a new client to the local table or update an
* existing client
* @soft_iface: netdev struct of the mesh interface
* @addr: the mac address of the client to add
* @vid: VLAN identifier
* @ifindex: index of the interface where the client is connected to (useful to
* identify wireless clients)
* @mark: the value contained in the skb->mark field of the received packet (if
* any)
*
* Return: true if the client was successfully added, false otherwise.
*/
bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
unsigned short vid, int ifindex, u32 mark)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_tt_local_entry *tt_local;
struct batadv_tt_global_entry *tt_global = NULL;
struct batadv_softif_vlan *vlan;
struct net_device *in_dev = NULL;
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry;
int hash_added, table_size, packet_size_max;
bool ret = false;
bool roamed_back = false;
u8 remote_flags;
u32 match_mark;
if (ifindex != BATADV_NULL_IFINDEX)
in_dev = dev_get_by_index(&init_net, ifindex);
tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
if (!is_multicast_ether_addr(addr))
tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (tt_local) {
tt_local->last_seen = jiffies;
if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Re-adding pending client %pM (vid: %d)\n",
addr, BATADV_PRINT_VID(vid));
/* 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_CLIENT_PENDING;
goto add_event;
}
if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Roaming client %pM (vid: %d) came back to its original location\n",
addr, BATADV_PRINT_VID(vid));
/* 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_CLIENT_ROAM;
roamed_back = true;
}
goto check_roaming;
}
/* Ignore the client if we cannot send it in a full table response. */
table_size = batadv_tt_local_table_transmit_size(bat_priv);
table_size += batadv_tt_len(1);
packet_size_max = atomic_read(&bat_priv->packet_size_max);
if (table_size > packet_size_max) {
net_ratelimited_function(batadv_info, soft_iface,
"Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
table_size, packet_size_max, addr);
goto out;
}
tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
if (!tt_local)
goto out;
/* increase the refcounter of the related vlan */
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
addr, BATADV_PRINT_VID(vid))) {
kfree(tt_local);
tt_local = NULL;
goto out;
}
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
addr, BATADV_PRINT_VID(vid),
(u8)atomic_read(&bat_priv->tt.vn));
ether_addr_copy(tt_local->common.addr, addr);
/* 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_CLIENT_NEW;
tt_local->common.vid = vid;
if (batadv_is_wifi_netdev(in_dev))
tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
kref_init(&tt_local->common.refcount);
kref_get(&tt_local->common.refcount);
tt_local->last_seen = jiffies;
tt_local->common.added_at = tt_local->last_seen;
/* the batman interface mac and multicast addresses should never be
* purged
*/
if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
is_multicast_ether_addr(addr))
tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
batadv_choose_tt, &tt_local->common,
&tt_local->common.hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_local_entry_put(tt_local);
batadv_softif_vlan_put(vlan);
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_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,
tt_global->common.vid,
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_CLIENT_ROAM;
tt_global->roam_at = jiffies;
}
}
/* store the current remote flags before altering them. This helps
* understanding is flags are changing or not
*/
remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
if (batadv_is_wifi_netdev(in_dev))
tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
else
tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
/* check the mark in the skb: if it's equal to the configured
* isolation_mark, it means the packet is coming from an isolated
* non-mesh client
*/
match_mark = (mark & bat_priv->isolation_mark_mask);
if (bat_priv->isolation_mark_mask &&
match_mark == bat_priv->isolation_mark)
tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
else
tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
/* if any "dynamic" flag has been modified, resend an ADD event for this
* entry so that all the nodes can get the new flags
*/
if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
ret = true;
out:
if (in_dev)
dev_put(in_dev);
if (tt_local)
batadv_tt_local_entry_put(tt_local);
if (tt_global)
batadv_tt_global_entry_put(tt_global);
return ret;
}
/**
* batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
* within a TT Response directed to another node
* @orig_node: originator for which the TT data has to be prepared
* @tt_data: uninitialised pointer to the address of the TVLV buffer
* @tt_change: uninitialised pointer to the address of the area where the TT
* changed can be stored
* @tt_len: pointer to the length to reserve to the tt_change. if -1 this
* function reserves the amount of space needed to send the entire global TT
* table. In case of success the value is updated with the real amount of
* reserved bytes
* Allocate the needed amount of memory for the entire TT TVLV and write its
* header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
* objects, one per active VLAN served by the originator node.
*
* Return: the size of the allocated buffer or 0 in case of failure.
*/
static u16
batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
struct batadv_tvlv_tt_data **tt_data,
struct batadv_tvlv_tt_change **tt_change,
s32 *tt_len)
{
u16 num_vlan = 0;
u16 num_entries = 0;
u16 change_offset;
u16 tvlv_len;
struct batadv_tvlv_tt_vlan_data *tt_vlan;
struct batadv_orig_node_vlan *vlan;
u8 *tt_change_ptr;
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
num_vlan++;
num_entries += atomic_read(&vlan->tt.num_entries);
}
change_offset = sizeof(**tt_data);
change_offset += num_vlan * sizeof(*tt_vlan);
/* if tt_len is negative, allocate the space needed by the full table */
if (*tt_len < 0)
*tt_len = batadv_tt_len(num_entries);
tvlv_len = *tt_len;
tvlv_len += change_offset;
*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
if (!*tt_data) {
*tt_len = 0;
goto out;
}
(*tt_data)->flags = BATADV_NO_FLAGS;
(*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
(*tt_data)->num_vlan = htons(num_vlan);
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
tt_vlan->vid = htons(vlan->vid);
tt_vlan->crc = htonl(vlan->tt.crc);
tt_vlan++;
}
tt_change_ptr = (u8 *)*tt_data + change_offset;
*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
out:
rcu_read_unlock();
return tvlv_len;
}
/**
* batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
* node
* @bat_priv: the bat priv with all the soft interface information
* @tt_data: uninitialised pointer to the address of the TVLV buffer
* @tt_change: uninitialised pointer to the address of the area where the TT
* changes can be stored
* @tt_len: pointer to the length to reserve to the tt_change. if -1 this
* function reserves the amount of space needed to send the entire local TT
* table. In case of success the value is updated with the real amount of
* reserved bytes
*
* Allocate the needed amount of memory for the entire TT TVLV and write its
* header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
* objects, one per active VLAN.
*
* Return: the size of the allocated buffer or 0 in case of failure.
*/
static u16
batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
struct batadv_tvlv_tt_data **tt_data,
struct batadv_tvlv_tt_change **tt_change,
s32 *tt_len)
{
struct batadv_tvlv_tt_vlan_data *tt_vlan;
struct batadv_softif_vlan *vlan;
u16 num_vlan = 0;
u16 num_entries = 0;
u16 tvlv_len;
u8 *tt_change_ptr;
int change_offset;
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
num_vlan++;
num_entries += atomic_read(&vlan->tt.num_entries);
}
change_offset = sizeof(**tt_data);
change_offset += num_vlan * sizeof(*tt_vlan);
/* if tt_len is negative, allocate the space needed by the full table */
if (*tt_len < 0)
*tt_len = batadv_tt_len(num_entries);
tvlv_len = *tt_len;
tvlv_len += change_offset;
*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
if (!*tt_data) {
tvlv_len = 0;
goto out;
}
(*tt_data)->flags = BATADV_NO_FLAGS;
(*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
(*tt_data)->num_vlan = htons(num_vlan);
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
tt_vlan->vid = htons(vlan->vid);
tt_vlan->crc = htonl(vlan->tt.crc);
tt_vlan++;
}
tt_change_ptr = (u8 *)*tt_data + change_offset;
*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
out:
rcu_read_unlock();
return tvlv_len;
}
/**
* batadv_tt_tvlv_container_update - update the translation table tvlv container
* after local tt changes have been committed
* @bat_priv: the bat priv with all the soft interface information
*/
static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
{
struct batadv_tt_change_node *entry, *safe;
struct batadv_tvlv_tt_data *tt_data;
struct batadv_tvlv_tt_change *tt_change;
int tt_diff_len, tt_change_len = 0;
int tt_diff_entries_num = 0;
int tt_diff_entries_count = 0;
u16 tvlv_len;
tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
tt_diff_len = batadv_tt_len(tt_diff_entries_num);
/* 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 (tt_diff_len > bat_priv->soft_iface->mtu)
tt_diff_len = 0;
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
&tt_change, &tt_diff_len);
if (!tvlv_len)
return;
tt_data->flags = BATADV_TT_OGM_DIFF;
if (tt_diff_len == 0)
goto container_register;
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 (tt_diff_entries_count < tt_diff_entries_num) {
memcpy(tt_change + tt_diff_entries_count,
&entry->change,
sizeof(struct batadv_tvlv_tt_change));
tt_diff_entries_count++;
}
list_del(&entry->list);
kfree(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;
tt_change_len = batadv_tt_len(tt_diff_entries_count);
/* check whether this new OGM has no changes due to size problems */
if (tt_diff_entries_count > 0) {
/* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
if (bat_priv->tt.last_changeset) {
memcpy(bat_priv->tt.last_changeset,
tt_change, tt_change_len);
bat_priv->tt.last_changeset_len = tt_diff_len;
}
}
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
container_register:
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
tvlv_len);
kfree(tt_data);
}
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 batadv_softif_vlan *vlan;
struct hlist_head *head;
unsigned short vid;
u32 i;
int last_seen_secs;
int last_seen_msecs;
unsigned long last_seen_jiffies;
bool no_purge;
u16 np_flag = BATADV_TT_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):\n",
net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
"Flags", "Last seen", "CRC");
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);
vid = tt_common_entry->vid;
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;
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (!vlan) {
seq_printf(seq, "Cannot retrieve VLAN %d\n",
BATADV_PRINT_VID(vid));
continue;
}
seq_printf(seq,
" * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
tt_common_entry->addr,
BATADV_PRINT_VID(tt_common_entry->vid),
((tt_common_entry->flags &
BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
no_purge ? 'P' : '.',
((tt_common_entry->flags &
BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
((tt_common_entry->flags &
BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
((tt_common_entry->flags &
BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
((tt_common_entry->flags &
BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
no_purge ? 0 : last_seen_secs,
no_purge ? 0 : last_seen_msecs,
vlan->tt.crc);
batadv_softif_vlan_put(vlan);
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_put(primary_if);
return 0;
}
static void
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
struct batadv_tt_local_entry *tt_local_entry,
u16 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_CLIENT_PENDING;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
tt_local_entry->common.addr,
BATADV_PRINT_VID(tt_local_entry->common.vid), 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
* @vid: VLAN identifier
* @message: message to append to the log on deletion
* @roaming: true if the deletion is due to a roaming event
*
* Return: the flags assigned to the local entry before being deleted
*/
u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
unsigned short vid, const char *message,
bool roaming)
{
struct batadv_tt_local_entry *tt_local_entry;
u16 flags, curr_flags = BATADV_NO_FLAGS;
struct batadv_softif_vlan *vlan;
void *tt_entry_exists;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
if (!tt_local_entry)
goto out;
curr_flags = tt_local_entry->common.flags;
flags = BATADV_TT_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_CLIENT_ROAM;
/* mark the local client as ROAMed */
tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
}
if (!(tt_local_entry->common.flags & BATADV_TT_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_CLIENT_DEL);
tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
batadv_compare_tt,
batadv_choose_tt,
&tt_local_entry->common);
if (!tt_entry_exists)
goto out;
/* extra call to free the local tt entry */
batadv_tt_local_entry_put(tt_local_entry);
/* decrease the reference held for this vlan */
vlan = batadv_softif_vlan_get(bat_priv, vid);
if (!vlan)
goto out;
batadv_softif_vlan_put(vlan);
batadv_softif_vlan_put(vlan);
out:
if (tt_local_entry)
batadv_tt_local_entry_put(tt_local_entry);
return curr_flags;
}
/**
* batadv_tt_local_purge_list - purge inactive tt local entries
* @bat_priv: the bat priv with all the soft interface information
* @head: pointer to the list containing the local tt entries
* @timeout: parameter deciding whether a given tt local entry is considered
* inactive or not
*/
static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
struct hlist_head *head,
int timeout)
{
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_CLIENT_NOPURGE)
continue;
/* entry already marked for deletion */
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
continue;
if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
continue;
batadv_tt_local_set_pending(bat_priv, tt_local_entry,
BATADV_TT_CLIENT_DEL, "timed out");
}
}
/**
* batadv_tt_local_purge - purge inactive tt local entries
* @bat_priv: the bat priv with all the soft interface information
* @timeout: parameter deciding whether a given tt local entry is considered
* inactive or not
*/
static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
int timeout)
{
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
u32 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, timeout);
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 batadv_softif_vlan *vlan;
struct hlist_node *node_tmp;
struct hlist_head *head;
u32 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);
/* decrease the reference held for this vlan */
vlan = batadv_softif_vlan_get(bat_priv,
tt_common_entry->vid);
if (vlan) {
batadv_softif_vlan_put(vlan);
batadv_softif_vlan_put(vlan);
}
batadv_tt_local_entry_put(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);
kfree(entry);
}
atomic_set(&bat_priv->tt.local_changes, 0);
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
}
/**
* batadv_tt_global_orig_entry_find - find a TT orig_list_entry
* @entry: the TT global entry where the orig_list_entry has to be
* extracted from
* @orig_node: the originator for which the orig_list_entry has to be found
*
* retrieve the orig_tt_list_entry belonging to orig_node from the
* batadv_tt_global_entry list
*
* Return: 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 (!kref_get_unless_zero(&tmp_orig_entry->refcount))
continue;
orig_entry = tmp_orig_entry;
break;
}
rcu_read_unlock();
return orig_entry;
}
/**
* batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
* by a given originator
* @entry: the TT global entry to check
* @orig_node: the originator to search in the list
*
* find out if an orig_node is already in the list of a tt_global_entry.
*
* Return: 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_put(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 = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
if (!orig_entry)
goto out;
INIT_HLIST_NODE(&orig_entry->list);
kref_get(&orig_node->refcount);
batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
orig_entry->orig_node = orig_node;
orig_entry->ttvn = ttvn;
kref_init(&orig_entry->refcount);
kref_get(&orig_entry->refcount);
spin_lock_bh(&tt_global->list_lock);
hlist_add_head_rcu(&orig_entry->list,
&tt_global->orig_list);
spin_unlock_bh(&tt_global->list_lock);
atomic_inc(&tt_global->orig_list_count);
out:
if (orig_entry)
batadv_tt_orig_list_entry_put(orig_entry);
}
/**
* batadv_tt_global_add - add a new TT global entry or update an existing one
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: the originator announcing the client
* @tt_addr: the mac address of the non-mesh client
* @vid: VLAN identifier
* @flags: TT flags that have to be set for this non-mesh client
* @ttvn: the tt version number ever announcing this non-mesh client
*
* Add a new TT global entry for the given originator. If the entry already
* exists add a new reference to the given originator (a global entry can have
* references to multiple originators) and adjust the flags attribute to reflect
* the function argument.
* If a TT local entry exists for this non-mesh client remove it.
*
* The caller must hold orig_node refcount.
*
* Return: true if the new entry has been added, false otherwise
*/
static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_addr,
unsigned short vid, u16 flags, u8 ttvn)
{
struct batadv_tt_global_entry *tt_global_entry;
struct batadv_tt_local_entry *tt_local_entry;
bool ret = false;
int hash_added;
struct batadv_tt_common_entry *common;
u16 local_flags;
/* ignore global entries from backbone nodes */
if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
return true;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
/* if the node already has a local client for this entry, it has to wait
* for a roaming advertisement instead of manually messing up the global
* table
*/
if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
goto out;
if (!tt_global_entry) {
tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
if (!tt_global_entry)
goto out;
common = &tt_global_entry->common;
ether_addr_copy(common->addr, tt_addr);
common->vid = vid;
common->flags = flags;
tt_global_entry->roam_at = 0;
/* node must store current time in case of roaming. This is
* needed to purge this entry out on timeout (if nobody claims
* it)
*/
if (flags & BATADV_TT_CLIENT_ROAM)
tt_global_entry->roam_at = jiffies;
kref_init(&common->refcount);
kref_get(&common->refcount);
common->added_at = jiffies;
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
atomic_set(&tt_global_entry->orig_list_count, 0);
spin_lock_init(&tt_global_entry->list_lock);
hash_added = batadv_hash_add(bat_priv->tt.global_hash,
batadv_compare_tt,
batadv_choose_tt, common,
&common->hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_global_entry_put(tt_global_entry);
goto out_remove;
}
} else {
common = &tt_global_entry->common;
/* If there is already a global entry, we can use this one for
* our processing.
* But if we are trying to add a temporary client then here are
* two options at this point:
* 1) the global client is not a temporary client: the global
* client has to be left as it is, temporary information
* should never override any already known client state
* 2) the global client is a temporary client: purge the
* originator list and add the new one orig_entry
*/
if (flags & BATADV_TT_CLIENT_TEMP) {
if (!(common->flags & BATADV_TT_CLIENT_TEMP))
goto out;
if (batadv_tt_global_entry_has_orig(tt_global_entry,
orig_node))
goto out_remove;
batadv_tt_global_del_orig_list(tt_global_entry);
goto add_orig_entry;
}
/* if the client was temporary added before receiving the first
* OGM announcing it, we have to clear the TEMP flag. Also,
* remove the previous temporary orig node and re-add it
* if required. If the orig entry changed, the new one which
* is a non-temporary entry is preferred.
*/
if (common->flags & BATADV_TT_CLIENT_TEMP) {
batadv_tt_global_del_orig_list(tt_global_entry);
common->flags &= ~BATADV_TT_CLIENT_TEMP;
}
/* the change can carry possible "attribute" flags like the
* TT_CLIENT_WIFI, therefore they have to be copied in the
* client entry
*/
common->flags |= flags;
/* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
* one originator left in the list and we previously received a
* delete + roaming change for this originator.
*
* We should first delete the old originator before adding the
* new one.
*/
if (common->flags & BATADV_TT_CLIENT_ROAM) {
batadv_tt_global_del_orig_list(tt_global_entry);
common->flags &= ~BATADV_TT_CLIENT_ROAM;
tt_global_entry->roam_at = 0;
}
}
add_orig_entry:
/* add the new orig_entry (if needed) or update it */
batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Creating new global tt entry: %pM (vid: %d, via %pM)\n",
common->addr, BATADV_PRINT_VID(common->vid),
orig_node->orig);
ret = true;
out_remove:
/* Do not remove multicast addresses from the local hash on
* global additions
*/
if (is_multicast_ether_addr(tt_addr))
goto out;
/* remove address from local hash if present */
local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
"global tt received",
flags & BATADV_TT_CLIENT_ROAM);
tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
if (!(flags & BATADV_TT_CLIENT_ROAM))
/* this is a normal global add. Therefore the client is not in a
* roaming state anymore.
*/
tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
out:
if (tt_global_entry)
batadv_tt_global_entry_put(tt_global_entry);
if (tt_local_entry)
batadv_tt_local_entry_put(tt_local_entry);
return ret;
}
/**
* batadv_transtable_best_orig - Get best originator list entry from tt entry
* @bat_priv: the bat priv with all the soft interface information
* @tt_global_entry: global translation table entry to be analyzed
*
* This functon assumes the caller holds rcu_read_lock().
* Return: best originator list entry or NULL on errors.
*/
static struct batadv_tt_orig_list_entry *
batadv_transtable_best_orig(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global_entry)
{
struct batadv_neigh_node *router, *best_router = NULL;
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, head, list) {
router = batadv_orig_router_get(orig_entry->orig_node,
BATADV_IF_DEFAULT);
if (!router)
continue;
if (best_router &&
bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
best_router, BATADV_IF_DEFAULT) <= 0) {
batadv_neigh_node_put(router);
continue;
}
/* release the refcount for the "old" best */
if (best_router)
batadv_neigh_node_put(best_router);
best_entry = orig_entry;
best_router = router;
}
if (best_router)
batadv_neigh_node_put(best_router);
return best_entry;
}
/**
* batadv_tt_global_print_entry - print all orig nodes who announce the address
* for this global entry
* @bat_priv: the bat priv with all the soft interface information
* @tt_global_entry: global translation table entry to be printed
* @seq: debugfs table seq_file struct
*
* This functon assumes the caller holds rcu_read_lock().
*/
static void
batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global_entry,
struct seq_file *seq)
{
struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_orig_node_vlan *vlan;
struct hlist_head *head;
u8 last_ttvn;
u16 flags;
tt_common_entry = &tt_global_entry->common;
flags = tt_common_entry->flags;
best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
if (best_entry) {
vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
tt_common_entry->vid);
if (!vlan) {
seq_printf(seq,
" * Cannot retrieve VLAN %d for originator %pM\n",
BATADV_PRINT_VID(tt_common_entry->vid),
best_entry->orig_node->orig);
goto print_list;
}
last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
seq_printf(seq,
" %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
'*', tt_global_entry->common.addr,
BATADV_PRINT_VID(tt_global_entry->common.vid),
best_entry->ttvn, best_entry->orig_node->orig,
last_ttvn, vlan->tt.crc,
((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
batadv_orig_node_vlan_put(vlan);
}
print_list:
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, head, list) {
if (best_entry == orig_entry)
continue;
vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
tt_common_entry->vid);
if (!vlan) {
seq_printf(seq,
" + Cannot retrieve VLAN %d for originator %pM\n",
BATADV_PRINT_VID(tt_common_entry->vid),
orig_entry->orig_node->orig);
continue;
}
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
seq_printf(seq,
" %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
'+', tt_global_entry->common.addr,
BATADV_PRINT_VID(tt_global_entry->common.vid),
orig_entry->ttvn, orig_entry->orig_node->orig,
last_ttvn, vlan->tt.crc,
((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
batadv_orig_node_vlan_put(vlan);
}
}
int batadv_tt_global_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.global_hash;
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_global_entry *tt_global;
struct batadv_hard_iface *primary_if;
struct hlist_head *head;
u32 i;
primary_if = batadv_seq_print_text_primary_if_get(seq);
if (!primary_if)
goto out;
seq_printf(seq,
"Globally announced TT entries received via the mesh %s\n",
net_dev->name);
seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
"Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
"CRC", "Flags");
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_global = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
batadv_tt_global_print_entry(bat_priv, tt_global, seq);
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_put(primary_if);
return 0;
}
/**
* _batadv_tt_global_del_orig_entry - remove and free an orig_entry
* @tt_global_entry: the global entry to remove the orig_entry from
* @orig_entry: the orig entry to remove and free
*
* Remove an orig_entry from its list in the given tt_global_entry and
* free this orig_entry afterwards.
*
* Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
* part of a list.
*/
static void
_batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
struct batadv_tt_orig_list_entry *orig_entry)
{
lockdep_assert_held(&tt_global_entry->list_lock);
batadv_tt_global_size_dec(orig_entry->orig_node,
tt_global_entry->common.vid);
atomic_dec(&tt_global_entry->orig_list_count);
/* requires holding tt_global_entry->list_lock and orig_entry->list
* being part of a list
*/
hlist_del_rcu(&orig_entry->list);
batadv_tt_orig_list_entry_put(orig_entry);
}
/* deletes the orig list of a tt_global_entry */
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
{
struct hlist_head *head;
struct hlist_node *safe;
struct batadv_tt_orig_list_entry *orig_entry;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, safe, head, list)
_batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
spin_unlock_bh(&tt_global_entry->list_lock);
}
/**
* batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
* @bat_priv: the bat priv with all the soft interface information
* @tt_global_entry: the global entry to remove the orig_node from
* @orig_node: the originator announcing the client
* @message: message to append to the log on deletion
*
* Remove the given orig_node and its according orig_entry from the given
* global tt entry.
*/
static void
batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global_entry,
struct batadv_orig_node *orig_node,
const char *message)
{
struct hlist_head *head;
struct hlist_node *safe;
struct batadv_tt_orig_list_entry *orig_entry;
unsigned short vid;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, safe, head, list) {
if (orig_entry->orig_node == orig_node) {
vid = tt_global_entry->common.vid;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting %pM from global tt entry %pM (vid: %d): %s\n",
orig_node->orig,
tt_global_entry->common.addr,
BATADV_PRINT_VID(vid), message);
_batadv_tt_global_del_orig_entry(tt_global_entry,
orig_entry);
}
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
/* If the client is to be deleted, we check if it is the last origantor entry
* within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
* timer, otherwise we simply remove the originator scheduled for deletion.
*/
static void
batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global_entry,
struct batadv_orig_node *orig_node,
const char *message)
{
bool last_entry = true;
struct hlist_head *head;
struct batadv_tt_orig_list_entry *orig_entry;
/* no local entry exists, case 1:
* Check if this is the last one or if other entries exist.
*/
rcu_read_lock();
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, head, list) {
if (orig_entry->orig_node != orig_node) {
last_entry = false;
break;
}
}
rcu_read_unlock();
if (last_entry) {
/* its the last one, mark for roaming. */
tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
} else
/* there is another entry, we can simply delete this
* one and can still use the other one.
*/
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
orig_node, message);
}
/**
* batadv_tt_global_del - remove a client from the global table
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: an originator serving this client
* @addr: the mac address of the client
* @vid: VLAN identifier
* @message: a message explaining the reason for deleting the client to print
* for debugging purpose
* @roaming: true if the deletion has been triggered by a roaming event
*/
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *addr, unsigned short vid,
const char *message, bool roaming)
{
struct batadv_tt_global_entry *tt_global_entry;
struct batadv_tt_local_entry *local_entry = NULL;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (!tt_global_entry)
goto out;
if (!roaming) {
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list))
batadv_tt_global_free(bat_priv, tt_global_entry,
message);
goto out;
}
/* if we are deleting a global entry due to a roam
* event, there are two possibilities:
* 1) the client roamed from node A to node B => if there
* is only one originator left for this client, we mark
* it with BATADV_TT_CLIENT_ROAM, we start a timer and we
* wait for node B to claim it. In case of timeout
* the entry is purged.
*
* If there are other originators left, we directly delete
* the originator.
* 2) the client roamed to us => we can directly delete
* the global entry, since it is useless now.
*/
local_entry = batadv_tt_local_hash_find(bat_priv,
tt_global_entry->common.addr,
vid);
if (local_entry) {
/* local entry exists, case 2: client roamed to us. */
batadv_tt_global_del_orig_list(tt_global_entry);
batadv_tt_global_free(bat_priv, tt_global_entry, message);
} else
/* no local entry exists, case 1: check for roaming */
batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
orig_node, message);
out:
if (tt_global_entry)
batadv_tt_global_entry_put(tt_global_entry);
if (local_entry)
batadv_tt_local_entry_put(local_entry);
}
/**
* batadv_tt_global_del_orig - remove all the TT global entries belonging to the
* given originator matching the provided vid
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: the originator owning the entries to remove
* @match_vid: the VLAN identifier to match. If negative all the entries will be
* removed
* @message: debug message to print as "reason"
*/
void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
s32 match_vid,
const char *message)
{
struct batadv_tt_global_entry *tt_global;
struct batadv_tt_common_entry *tt_common_entry;
u32 i;
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
struct hlist_node *safe;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
unsigned short vid;
if (!hash)
return;
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, safe,
head, hash_entry) {
/* remove only matching entries */
if (match_vid >= 0 && tt_common_entry->vid != match_vid)
continue;
tt_global = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
batadv_tt_global_del_orig_node(bat_priv, tt_global,
orig_node, message);
if (hlist_empty(&tt_global->orig_list)) {
vid = tt_global->common.vid;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting global tt entry %pM (vid: %d): %s\n",
tt_global->common.addr,
BATADV_PRINT_VID(vid), message);
hlist_del_rcu(&tt_common_entry->hash_entry);
batadv_tt_global_entry_put(tt_global);
}
}
spin_unlock_bh(list_lock);
}
clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
}
static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
char **msg)
{
bool purge = false;
unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
purge = true;
*msg = "Roaming timeout\n";
}
if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
purge = true;
*msg = "Temporary client timeout\n";
}
return purge;
}
static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
struct hlist_head *head;
struct hlist_node *node_tmp;
spinlock_t *list_lock; /* protects write access to the hash lists */
u32 i;
char *msg = NULL;
struct batadv_tt_common_entry *tt_common;
struct batadv_tt_global_entry *tt_global;
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, node_tmp, head,
hash_entry) {
tt_global = container_of(tt_common,
struct batadv_tt_global_entry,
common);
if (!batadv_tt_global_to_purge(tt_global, &msg))
continue;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting global tt entry %pM (vid: %d): %s\n",
tt_global->common.addr,
BATADV_PRINT_VID(tt_global->common.vid),
msg);
hlist_del_rcu(&tt_common->hash_entry);
batadv_tt_global_entry_put(tt_global);
}
spin_unlock_bh(list_lock);
}
}
static void batadv_tt_global_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_global_entry *tt_global;
struct hlist_node *node_tmp;
struct hlist_head *head;
u32 i;
if (!bat_priv->tt.global_hash)
return;
hash = bat_priv->tt.global_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_global = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
batadv_tt_global_entry_put(tt_global);
}
spin_unlock_bh(list_lock);
}
batadv_hash_destroy(hash);
bat_priv->tt.global_hash = NULL;
}
static bool
_batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
struct batadv_tt_global_entry *tt_global_entry)
{
bool ret = false;
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
ret = true;
/* check if the two clients are marked as isolated */
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
ret = true;
return ret;
}
/**
* batadv_transtable_search - get the mesh destination for a given client
* @bat_priv: the bat priv with all the soft interface information
* @src: mac address of the source client
* @addr: mac address of the destination client
* @vid: VLAN identifier
*
* Return: a pointer to the originator that was selected as destination in the
* mesh for contacting the client 'addr', NULL otherwise.
* In case of multiple originators serving the same client, the function returns
* the best one (best in terms of metric towards the destination node).
*
* If the two clients are AP isolated the function returns NULL.
*/
struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
const u8 *src,
const u8 *addr,
unsigned short vid)
{
struct batadv_tt_local_entry *tt_local_entry = NULL;
struct batadv_tt_global_entry *tt_global_entry = NULL;
struct batadv_orig_node *orig_node = NULL;
struct batadv_tt_orig_list_entry *best_entry;
if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
if (!tt_local_entry ||
(tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
goto out;
}
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
if (!tt_global_entry)
goto out;
/* check whether the clients should not communicate due to AP
* isolation
*/
if (tt_local_entry &&
_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
goto out;
rcu_read_lock();
best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
/* found anything? */
if (best_entry)
orig_node = best_entry->orig_node;
if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
orig_node = NULL;
rcu_read_unlock();
out:
if (tt_global_entry)
batadv_tt_global_entry_put(tt_global_entry);
if (tt_local_entry)
batadv_tt_local_entry_put(tt_local_entry);
return orig_node;
}
/**
* batadv_tt_global_crc - calculates the checksum of the local table belonging
* to the given orig_node
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: originator for which the CRC should be computed
* @vid: VLAN identifier for which the CRC32 has to be computed
*
* This function computes the checksum for the global table corresponding to a
* specific originator. In particular, the checksum is computed as follows: For
* each client connected to the originator the CRC32C of the MAC address and the
* VID is computed and then all the CRC32Cs of the various clients are xor'ed
* together.
*
* The idea behind is that CRC32C should be used as much as possible in order to
* produce a unique hash of the table, but since the order which is used to feed
* the CRC32C function affects the result and since every node in the network
* probably sorts the clients differently, the hash function cannot be directly
* computed over the entire table. Hence the CRC32C is used only on
* the single client entry, while all the results are then xor'ed together
* because the XOR operation can combine them all while trying to reduce the
* noise as much as possible.
*
* Return: the checksum of the global table of a given originator.
*/
static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
unsigned short vid)
{
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
struct batadv_tt_common_entry *tt_common;
struct batadv_tt_global_entry *tt_global;
struct hlist_head *head;
u32 i, crc_tmp, crc = 0;
u8 flags;
__be16 tmp_vid;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
tt_global = container_of(tt_common,
struct batadv_tt_global_entry,
common);
/* compute the CRC only for entries belonging to the
* VLAN identified by the vid passed as parameter
*/
if (tt_common->vid != vid)
continue;
/* Roaming clients are in the global table for
* consistency only. They don't have to be
* taken into account while computing the
* global crc
*/
if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
continue;
/* Temporary clients have not been announced yet, so
* they have to be skipped while computing the global
* crc
*/
if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
continue;
/* find out if this global entry is announced by this
* originator
*/
if (!batadv_tt_global_entry_has_orig(tt_global,
orig_node))
continue;
/* use network order to read the VID: this ensures that
* every node reads the bytes in the same order.
*/
tmp_vid = htons(tt_common->vid);
crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
/* compute the CRC on flags that have to be kept in sync
* among nodes
*/
flags = tt_common->flags & BATADV_TT_SYNC_MASK;
crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
}
rcu_read_unlock();
}
return crc;
}
/**
* batadv_tt_local_crc - calculates the checksum of the local table
* @bat_priv: the bat priv with all the soft interface information
* @vid: VLAN identifier for which the CRC32 has to be computed
*
* For details about the computation, please refer to the documentation for
* batadv_tt_global_crc().
*
* Return: the checksum of the local table
*/
static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
unsigned short vid)
{
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
struct batadv_tt_common_entry *tt_common;
struct hlist_head *head;
u32 i, crc_tmp, crc = 0;
u8 flags;
__be16 tmp_vid;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
/* compute the CRC only for entries belonging to the
* VLAN identified by vid
*/
if (tt_common->vid != vid)
continue;
/* not yet committed clients have not to be taken into
* account while computing the CRC
*/
if (tt_common->flags & BATADV_TT_CLIENT_NEW)
continue;
/* use network order to read the VID: this ensures that
* every node reads the bytes in the same order.
*/
tmp_vid = htons(tt_common->vid);
crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
/* compute the CRC on flags that have to be kept in sync
* among nodes
*/
flags = tt_common->flags & BATADV_TT_SYNC_MASK;
crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
}
rcu_read_unlock();
}
return crc;
}
static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
{
struct batadv_tt_req_node *node;
struct hlist_node *safe;
spin_lock_bh(&bat_priv->tt.req_list_lock);
hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
hlist_del_init(&node->list);
kfree(node);
}
spin_unlock_bh(&bat_priv->tt.req_list_lock);
}
static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const void *tt_buff,
u16 tt_buff_len)
{
/* Replace the old buffer only if I received something in the
* last OGM (the OGM could carry no changes)
*/
spin_lock_bh(&orig_node->tt_buff_lock);
if (tt_buff_len > 0) {
kfree(orig_node->tt_buff);
orig_node->tt_buff_len = 0;
orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
if (orig_node->tt_buff) {
memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
orig_node->tt_buff_len = tt_buff_len;
}
}
spin_unlock_bh(&orig_node->tt_buff_lock);
}
static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
{
struct batadv_tt_req_node *node;
struct hlist_node *safe;
spin_lock_bh(&bat_priv->tt.req_list_lock);
hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
if (batadv_has_timed_out(node->issued_at,
BATADV_TT_REQUEST_TIMEOUT)) {
hlist_del_init(&node->list);
kfree(node);
}
}
spin_unlock_bh(&bat_priv->tt.req_list_lock);
}
/**
* batadv_tt_req_node_new - search and possibly create a tt_req_node object
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node this request is being issued for
*
* Return: the pointer to the new tt_req_node struct if no request
* has already been issued for this orig_node, NULL otherwise.
*/
static struct batadv_tt_req_node *
batadv_tt_req_node_new(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
spin_lock_bh(&bat_priv->tt.req_list_lock);
hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
!batadv_has_timed_out(tt_req_node_tmp->issued_at,
BATADV_TT_REQUEST_TIMEOUT))
goto unlock;
}
tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
if (!tt_req_node)
goto unlock;
ether_addr_copy(tt_req_node->addr, orig_node->orig);
tt_req_node->issued_at = jiffies;
hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
unlock:
spin_unlock_bh(&bat_priv->tt.req_list_lock);
return tt_req_node;
}
/**
* batadv_tt_local_valid - verify that given tt entry is a valid one
* @entry_ptr: to be checked local tt entry
* @data_ptr: not used but definition required to satisfy the callback prototype
*
* Return: 1 if the entry is a valid, 0 otherwise.
*/
static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
{
const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
return 0;
return 1;
}
static int batadv_tt_global_valid(const void *entry_ptr,
const void *data_ptr)
{
const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
const struct batadv_tt_global_entry *tt_global_entry;
const struct batadv_orig_node *orig_node = data_ptr;
if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
return 0;
tt_global_entry = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
}
/**
* batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
* specified tt hash
* @bat_priv: the bat priv with all the soft interface information
* @hash: hash table containing the tt entries
* @tt_len: expected tvlv tt data buffer length in number of bytes
* @tvlv_buff: pointer to the buffer to fill with the TT data
* @valid_cb: function to filter tt change entries
* @cb_data: data passed to the filter function as argument
*/
static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
struct batadv_hashtable *hash,
void *tvlv_buff, u16 tt_len,
int (*valid_cb)(const void *, const void *),
void *cb_data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tvlv_tt_change *tt_change;
struct hlist_head *head;
u16 tt_tot, tt_num_entries = 0;
u32 i;
tt_tot = batadv_tt_entries(tt_len);
tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
rcu_read_lock();
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_rcu(tt_common_entry,
head, hash_entry) {
if (tt_tot == tt_num_entries)
break;
if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
continue;
ether_addr_copy(tt_change->addr, tt_common_entry->addr);
tt_change->flags = tt_common_entry->flags;
tt_change->vid = htons(tt_common_entry->vid);
memset(tt_change->reserved, 0,
sizeof(tt_change->reserved));
tt_num_entries++;
tt_change++;
}
}
rcu_read_unlock();
}
/**
* batadv_tt_global_check_crc - check if all the CRCs are correct
* @orig_node: originator for which the CRCs have to be checked
* @tt_vlan: pointer to the first tvlv VLAN entry
* @num_vlan: number of tvlv VLAN entries
*
* Return: true if all the received CRCs match the locally stored ones, false
* otherwise
*/
static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
struct batadv_tvlv_tt_vlan_data *tt_vlan,
u16 num_vlan)
{
struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
struct batadv_orig_node_vlan *vlan;
int i, orig_num_vlan;
u32 crc;
/* check if each received CRC matches the locally stored one */
for (i = 0; i < num_vlan; i++) {
tt_vlan_tmp = tt_vlan + i;
/* if orig_node is a backbone node for this VLAN, don't check
* the CRC as we ignore all the global entries over it
*/
if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
orig_node->orig,
ntohs(tt_vlan_tmp->vid)))
continue;
vlan = batadv_orig_node_vlan_get(orig_node,
ntohs(tt_vlan_tmp->vid));
if (!vlan)
return false;
crc = vlan->tt.crc;
batadv_orig_node_vlan_put(vlan);
if (crc != ntohl(tt_vlan_tmp->crc))
return false;
}
/* check if any excess VLANs exist locally for the originator
* which are not mentioned in the TVLV from the originator.
*/
rcu_read_lock();
orig_num_vlan = 0;
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
orig_num_vlan++;
rcu_read_unlock();
if (orig_num_vlan > num_vlan)
return false;
return true;
}
/**
* batadv_tt_local_update_crc - update all the local CRCs
* @bat_priv: the bat priv with all the soft interface information
*/
static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
{
struct batadv_softif_vlan *vlan;
/* recompute the global CRC for each VLAN */
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
}
rcu_read_unlock();
}
/**
* batadv_tt_global_update_crc - update all the global CRCs for this orig_node
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: the orig_node for which the CRCs have to be updated
*/
static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_orig_node_vlan *vlan;
u32 crc;
/* recompute the global CRC for each VLAN */
rcu_read_lock();
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
/* if orig_node is a backbone node for this VLAN, don't compute
* the CRC as we ignore all the global entries over it
*/
if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
vlan->vid))
continue;
crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
vlan->tt.crc = crc;
}
rcu_read_unlock();
}
/**
* batadv_send_tt_request - send a TT Request message to a given node
* @bat_priv: the bat priv with all the soft interface information
* @dst_orig_node: the destination of the message
* @ttvn: the version number that the source of the message is looking for
* @tt_vlan: pointer to the first tvlv VLAN object to request
* @num_vlan: number of tvlv VLAN entries
* @full_table: ask for the entire translation table if true, while only for the
* last TT diff otherwise
*
* Return: true if the TT Request was sent, false otherwise
*/
static int batadv_send_tt_request(struct batadv_priv *bat_priv,
struct batadv_orig_node *dst_orig_node,
u8 ttvn,
struct batadv_tvlv_tt_vlan_data *tt_vlan,
u16 num_vlan, bool full_table)
{
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
struct batadv_tt_req_node *tt_req_node = NULL;
struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
struct batadv_hard_iface *primary_if;
bool ret = false;
int i, size;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
/* The new tt_req will be issued only if I'm not waiting for a
* reply from the same orig_node yet
*/
tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
if (!tt_req_node)
goto out;
size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
if (!tvlv_tt_data)
goto out;
tvlv_tt_data->flags = BATADV_TT_REQUEST;
tvlv_tt_data->ttvn = ttvn;
tvlv_tt_data->num_vlan = htons(num_vlan);
/* send all the CRCs within the request. This is needed by intermediate
* nodes to ensure they have the correct table before replying
*/
tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
for (i = 0; i < num_vlan; i++) {
tt_vlan_req->vid = tt_vlan->vid;
tt_vlan_req->crc = tt_vlan->crc;
tt_vlan_req++;
tt_vlan++;
}
if (full_table)
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
dst_orig_node->orig, full_table ? 'F' : '.');
batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
dst_orig_node->orig, BATADV_TVLV_TT, 1,
tvlv_tt_data, size);
ret = true;
out:
if (primary_if)
batadv_hardif_put(primary_if);
if (ret && tt_req_node) {
spin_lock_bh(&bat_priv->tt.req_list_lock);
/* hlist_del_init() verifies tt_req_node still is in the list */
hlist_del_init(&tt_req_node->list);
spin_unlock_bh(&bat_priv->tt.req_list_lock);
kfree(tt_req_node);
}
kfree(tvlv_tt_data);
return ret;
}
/**
* batadv_send_other_tt_response - send reply to tt request concerning another
* node's translation table
* @bat_priv: the bat priv with all the soft interface information
* @tt_data: tt data containing the tt request information
* @req_src: mac address of tt request sender
* @req_dst: mac address of tt request recipient
*
* Return: true if tt request reply was sent, false otherwise.
*/
static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
struct batadv_tvlv_tt_data *tt_data,
u8 *req_src, u8 *req_dst)
{
struct batadv_orig_node *req_dst_orig_node;
struct batadv_orig_node *res_dst_orig_node = NULL;
struct batadv_tvlv_tt_change *tt_change;
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
struct batadv_tvlv_tt_vlan_data *tt_vlan;
bool ret = false, full_table;
u8 orig_ttvn, req_ttvn;
u16 tvlv_len;
s32 tt_len;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
req_src, tt_data->ttvn, req_dst,
((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
/* Let's get the orig node of the REAL destination */
req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
if (!req_dst_orig_node)
goto out;
res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
if (!res_dst_orig_node)
goto out;
orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
req_ttvn = tt_data->ttvn;
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
/* this node doesn't have the requested data */
if (orig_ttvn != req_ttvn ||
!batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
ntohs(tt_data->num_vlan)))
goto out;
/* If the full table has been explicitly requested */
if (tt_data->flags & BATADV_TT_FULL_TABLE ||
!req_dst_orig_node->tt_buff)
full_table = true;
else
full_table = false;
/* TT fragmentation hasn't been implemented yet, so send as many
* TT entries fit a single packet as possible only
*/
if (!full_table) {
spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
tt_len = req_dst_orig_node->tt_buff_len;
tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
&tvlv_tt_data,
&tt_change,
&tt_len);
if (!tt_len)
goto unlock;
/* Copy the last orig_node's OGM buffer */
memcpy(tt_change, req_dst_orig_node->tt_buff,
req_dst_orig_node->tt_buff_len);
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
} else {
/* allocate the tvlv, put the tt_data and all the tt_vlan_data
* in the initial part
*/
tt_len = -1;
tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
&tvlv_tt_data,
&tt_change,
&tt_len);
if (!tt_len)
goto out;
/* fill the rest of the tvlv with the real TT entries */
batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
tt_change, tt_len,
batadv_tt_global_valid,
req_dst_orig_node);
}
/* Don't send the response, if larger than fragmented packet. */
tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
net_ratelimited_function(batadv_info, bat_priv->soft_iface,
"Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
res_dst_orig_node->orig);
goto out;
}
tvlv_tt_data->flags = BATADV_TT_RESPONSE;
tvlv_tt_data->ttvn = req_ttvn;
if (full_table)
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
res_dst_orig_node->orig, req_dst_orig_node->orig,
full_table ? 'F' : '.', req_ttvn);
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
tvlv_len);
ret = true;
goto out;
unlock:
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
out:
if (res_dst_orig_node)
batadv_orig_node_put(res_dst_orig_node);
if (req_dst_orig_node)
batadv_orig_node_put(req_dst_orig_node);
kfree(tvlv_tt_data);
return ret;
}
/**
* batadv_send_my_tt_response - send reply to tt request concerning this node's
* translation table
* @bat_priv: the bat priv with all the soft interface information
* @tt_data: tt data containing the tt request information
* @req_src: mac address of tt request sender
*
* Return: true if tt request reply was sent, false otherwise.
*/
static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
struct batadv_tvlv_tt_data *tt_data,
u8 *req_src)
{
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
struct batadv_hard_iface *primary_if = NULL;
struct batadv_tvlv_tt_change *tt_change;
struct batadv_orig_node *orig_node;
u8 my_ttvn, req_ttvn;
u16 tvlv_len;
bool full_table;
s32 tt_len;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
req_src, tt_data->ttvn,
((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
spin_lock_bh(&bat_priv->tt.commit_lock);
my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
req_ttvn = tt_data->ttvn;
orig_node = batadv_orig_hash_find(bat_priv, req_src);
if (!orig_node)
goto out;
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if)
goto out;
/* If the full table has been explicitly requested or the gap
* is too big send the whole local translation table
*/
if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
!bat_priv->tt.last_changeset)
full_table = true;
else
full_table = false;
/* TT fragmentation hasn't been implemented yet, so send as many
* TT entries fit a single packet as possible only
*/
if (!full_table) {
spin_lock_bh(&bat_priv->tt.last_changeset_lock);
tt_len = bat_priv->tt.last_changeset_len;
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
&tvlv_tt_data,
&tt_change,
&tt_len);
if (!tt_len)
goto unlock;
/* Copy the last orig_node's OGM buffer */
memcpy(tt_change, bat_priv->tt.last_changeset,
bat_priv->tt.last_changeset_len);
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
} else {
req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
/* allocate the tvlv, put the tt_data and all the tt_vlan_data
* in the initial part
*/
tt_len = -1;
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
&tvlv_tt_data,
&tt_change,
&tt_len);
if (!tt_len)
goto out;
/* fill the rest of the tvlv with the real TT entries */
batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
tt_change, tt_len,
batadv_tt_local_valid, NULL);
}
tvlv_tt_data->flags = BATADV_TT_RESPONSE;
tvlv_tt_data->ttvn = req_ttvn;
if (full_table)
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
orig_node->orig, full_table ? 'F' : '.', req_ttvn);
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
tvlv_len);
goto out;
unlock:
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
out:
spin_unlock_bh(&bat_priv->tt.commit_lock);
if (orig_node)
batadv_orig_node_put(orig_node);
if (primary_if)
batadv_hardif_put(primary_if);
kfree(tvlv_tt_data);
/* The packet was for this host, so it doesn't need to be re-routed */
return true;
}
/**
* batadv_send_tt_response - send reply to tt request
* @bat_priv: the bat priv with all the soft interface information
* @tt_data: tt data containing the tt request information
* @req_src: mac address of tt request sender
* @req_dst: mac address of tt request recipient