[B.A.T.M.A.N.] [PATCH 3/4] batman-adv: improved roaming mechanism

Antonio Quartulli
2011-04-27T21:35:05Z

Exploting the new announcement implementation, it has been possible to
improve the roaming mechanism and reduce the number of packet drops.

For details, please visit:
http://www.open-mesh.org/wiki/batman-adv/Roaming-improvements

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
hard-interface.c | 4 +
main.c | 2 +
main.h | 4 +
originator.c | 1 +
packet.h | 10 +++
routing.c | 70 ++++++++++++++++++++--
routing.h | 1 +
send.c | 1 +
soft-interface.c | 3 +-
translation-table.c | 169 +++++++++++++++++++++++++++++++++++++++++++++-----
translation-table.h | 7 ++-
types.h | 24 +++++++
12 files changed, 271 insertions(+), 25 deletions(-)

diff --git a/hard-interface.c b/hard-interface.c
index 2a7c533..e88fccd 100644
--- a/hard-interface.c
+++ b/hard-interface.c
@@ -673,6 +673,10 @@ static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
case BAT_TT_QUERY:
ret = recv_tt_query(skb, hard_iface);
break;
+ /* Roaming advertisement */
+ case BAT_ROAM_ADV:
+ ret = recv_roam_adv(skb, hard_iface);
+ break;
default:
ret = NET_RX_DROP;
}
diff --git a/main.c b/main.c
index a84679a..31cbecc 100644
--- a/main.c
+++ b/main.c
@@ -85,6 +85,7 @@ int mesh_init(struct net_device *soft_iface)
spin_lock_init(&bat_priv->tt_ghash_lock);
spin_lock_init(&bat_priv->tt_changes_list_lock);
spin_lock_init(&bat_priv->tt_req_list_lock);
+ spin_lock_init(&bat_priv->tt_roam_list_lock);
spin_lock_init(&bat_priv->tt_buff_lock);
spin_lock_init(&bat_priv->gw_list_lock);
spin_lock_init(&bat_priv->vis_hash_lock);
@@ -97,6 +98,7 @@ int mesh_init(struct net_device *soft_iface)
INIT_HLIST_HEAD(&bat_priv->softif_neigh_list);
INIT_LIST_HEAD(&bat_priv->tt_changes_list);
INIT_LIST_HEAD(&bat_priv->tt_req_list);
+ INIT_LIST_HEAD(&bat_priv->tt_roam_list);

if (originator_init(bat_priv) < 1)
goto err;
diff --git a/main.h b/main.h
index cc1c277..802d87a 100644
--- a/main.h
+++ b/main.h
@@ -55,6 +55,10 @@
#define TT_ADD 0
#define TT_DEL 1

+#define ROAMING_MAX_TIME 20 /* Time in which a client can roam at most
+ * ROAMING_MAX_COUNT times */
+#define ROAMING_MAX_COUNT 5
+
#define NUM_WORDS (TQ_LOCAL_WINDOW_SIZE / WORD_BIT_SIZE)

#define LOG_BUF_LEN 8192 /* has to be a power of 2 */
diff --git a/originator.c b/originator.c
index be7257b..2cb7425 100644
--- a/originator.c
+++ b/originator.c
@@ -221,6 +221,7 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
/* extra reference for return */
atomic_set(&orig_node->refcount, 2);

+ orig_node->tt_poss_change = false;
orig_node->bat_priv = bat_priv;
memcpy(orig_node->orig, addr, ETH_ALEN);
orig_node->router = NULL;
diff --git a/packet.h b/packet.h
index 34a2775..e7ac34c 100644
--- a/packet.h
+++ b/packet.h
@@ -31,6 +31,7 @@
#define BAT_VIS 0x05
#define BAT_UNICAST_FRAG 0x06
#define BAT_TT_QUERY 0x07
+#define BAT_ROAM_ADV 0x08

/* this file is included by batctl which needs these defines */
#define COMPAT_VERSION 14
@@ -164,4 +165,13 @@ struct tt_query_packet {
*/
} __packed;

+struct roam_adv_packet {
+ uint8_t packet_type;
+ uint8_t version;
+ uint8_t dst[6];
+ uint8_t ttl;
+ uint8_t src[6];
+ uint8_t client[6];
+} __packed;
+
#endif /* _NET_BATMAN_ADV_PACKET_H_ */
diff --git a/routing.c b/routing.c
index 838394b..431370a 100644
--- a/routing.c
+++ b/routing.c
@@ -89,7 +89,7 @@ static void update_transtable(struct bat_priv *bat_priv,
else
if (!tt_global_add(bat_priv, orig_node,
tt_change->addr,
- ttvn))
+ ttvn, false))
/* In case of problem while storing a
* global_entry, we stop the updating
* procedure without committing the
@@ -108,6 +108,10 @@ static void update_transtable(struct bat_priv *bat_priv,
* to recompute it to spot any possible inconsistency
* in the global table */
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
+ /* Roaming phase is over: tables are in sync again. I can
+ * unset the flag */
+ if (tt_num_changes)
+ orig_node->tt_poss_change = false;
} else {
/* if we missed more than one change or our tables are not
* in sync anymore -> request fresh tt data */
@@ -1290,6 +1294,56 @@ out:
return ret;
}

+int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct roam_adv_packet *roam_adv_packet;
+ struct orig_node *orig_node;
+ struct ethhdr *ethhdr;
+ int ret = NET_RX_DROP;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet))))
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with unicast indication but broadcast recipient */
+ if (is_broadcast_ether_addr(ethhdr->h_dest))
+ goto out;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ goto out;
+
+ roam_adv_packet = (struct roam_adv_packet *)skb->data;
+
+ if (!is_my_mac(roam_adv_packet->dst))
+ return route_unicast_packet(skb, recv_if);
+
+ orig_node = orig_hash_find(bat_priv, roam_adv_packet->src);
+ if (!orig_node)
+ goto out;
+
+ tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
+ atomic_read(&orig_node->last_tt_ver_num) + 1, true);
+
+ /* Roaming phase starts: I have a new information but the ttvn has been
+ * incremented yet. This flag will make me check all the incoming
+ * packets for the correct destination. */
+ bat_priv->tt_poss_change = true;
+
+ bat_dbg(DBG_ROUTES, bat_priv, "Received ROAMING_ADV from %pM "
+ "(client %pM)\n", roam_adv_packet->src,
+ roam_adv_packet->client);
+
+ orig_node_free_ref(orig_node);
+ ret = NET_RX_SUCCESS;
+out:
+ kfree(skb);
+ return ret;
+}
+
/* find a suitable router for this originator, and use
* bonding if possible. increases the found neighbors
* refcount.*/
@@ -1478,35 +1532,41 @@ int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
struct ethhdr *ethhdr;
uint8_t curr_ttvn;
int16_t diff;
+ bool tt_poss_change;

if (check_unicast_packet(skb, hdr_size) < 0)
return NET_RX_DROP;

+ /* I could need to modify it */
+ if (skb_cow(skb, sizeof(struct unicast_packet)) < 0)
+ return NET_RX_DROP;
+
unicast_packet = (struct unicast_packet *)skb->data;

- if (is_my_mac(unicast_packet->dest))
+ if (is_my_mac(unicast_packet->dest)) {
+ tt_poss_change = bat_priv->tt_poss_change;
curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt_ver_num);
- else {
+ } else {
orig_node = orig_hash_find(bat_priv, unicast_packet->dest);

if (!orig_node)
return NET_RX_DROP;

curr_ttvn = (uint8_t)atomic_read(&orig_node->last_tt_ver_num);
+ tt_poss_change = orig_node->tt_poss_change;
orig_node_free_ref(orig_node);
}

diff = unicast_packet->ttvn - curr_ttvn;
/* Check whether I have to reroute the packet */
if (unicast_packet->packet_type == BAT_UNICAST &&
- (diff < 0 && diff > -0xff/2)) {
+ ((diff < 0 && diff > -0xff/2) || tt_poss_change)) {
/* Linearize the skb before accessing it */
if (skb_linearize(skb) < 0)
return NET_RX_DROP;

ethhdr = (struct ethhdr *)(skb->data +
sizeof(struct unicast_packet));
-
orig_node = transtable_search(bat_priv, ethhdr->h_dest);

if (!orig_node) {
diff --git a/routing.h b/routing.h
index 6f6a5f8..e2943e0 100644
--- a/routing.h
+++ b/routing.h
@@ -37,6 +37,7 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if);
int recv_bat_packet(struct sk_buff *skb, struct hard_iface *recv_if);
int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if);
struct neigh_node *find_router(struct bat_priv *bat_priv,
struct orig_node *orig_node,
struct hard_iface *recv_if);
diff --git a/send.c b/send.c
index f85913e..e975417 100644
--- a/send.c
+++ b/send.c
@@ -303,6 +303,7 @@ void schedule_own_packet(struct hard_iface *hard_iface)
prepare_packet_buffer(bat_priv, hard_iface);
/* Increment the TTVN only once per OGM interval */
atomic_inc(&bat_priv->tt_ver_num);
+ bat_priv->tt_poss_change = false;
}

/* if the changes have been sent enough times */
diff --git a/soft-interface.c b/soft-interface.c
index fedb1ed..eb35ae9 100644
--- a/soft-interface.c
+++ b/soft-interface.c
@@ -366,7 +366,7 @@ static int interface_set_mac_addr(struct net_device *dev, void *p)
/* only modify tt-table if it has been initialised before */
if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
tt_local_remove(bat_priv, dev->dev_addr,
- "mac address changed");
+ "mac address changed", false);
tt_local_add(dev, addr->sa_data);
}

@@ -669,6 +669,7 @@ struct net_device *softif_create(char *name)

bat_priv->tt_buff = NULL;
bat_priv->tt_buff_len = 0;
+ bat_priv->tt_poss_change = false;

bat_priv->primary_if = NULL;
bat_priv->num_ifaces = 0;
diff --git a/translation-table.c b/translation-table.c
index d55eeb5..0b13473 100644
--- a/translation-table.c
+++ b/translation-table.c
@@ -168,6 +168,8 @@ void tt_local_add(struct net_device *soft_iface, uint8_t *addr)
struct bat_priv *bat_priv = netdev_priv(soft_iface);
struct tt_local_entry *tt_local_entry;
struct tt_global_entry *tt_global_entry;
+ uint8_t roam_addr[ETH_ALEN];
+ struct orig_node *roam_orig_node;

spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
@@ -206,12 +208,21 @@ void tt_local_add(struct net_device *soft_iface, uint8_t *addr)

tt_global_entry = tt_global_hash_find(bat_priv, addr);

- if (tt_global_entry)
+ /* Check whether it is a roaming! */
+ if (tt_global_entry) {
+ memcpy(roam_addr, tt_global_entry->addr, ETH_ALEN);
+ roam_orig_node = tt_global_entry->orig_node;
+ /* This node is probably going to update its tt table */
+ tt_global_entry->orig_node->tt_poss_change = true;
_tt_global_del(bat_priv, tt_global_entry,
"local tt received");
+ spin_unlock_bh(&bat_priv->tt_ghash_lock);
+ send_roam_adv(bat_priv, tt_global_entry->addr,
+ tt_global_entry->orig_node);
+ } else
+ spin_unlock_bh(&bat_priv->tt_ghash_lock);

- spin_unlock_bh(&bat_priv->tt_ghash_lock);
-
+ return;
unlock:
spin_unlock_bh(&bat_priv->tt_lhash_lock);
}
@@ -364,7 +375,8 @@ static void tt_local_del(struct bat_priv *bat_priv,
tt_local_entry_free(&tt_local_entry->hash_entry, bat_priv);
}

-void tt_local_remove(struct bat_priv *bat_priv, uint8_t *addr, char *message)
+void tt_local_remove(struct bat_priv *bat_priv, uint8_t *addr,
+ char *message, bool roaming)
{
struct tt_local_entry *tt_local_entry;

@@ -372,7 +384,11 @@ void tt_local_remove(struct bat_priv *bat_priv, uint8_t *addr, char *message)
tt_local_entry = tt_local_hash_find(bat_priv, addr);

if (tt_local_entry) {
- tt_local_event(bat_priv, TT_DEL, tt_local_entry->addr);
+ if (roaming)
+ tt_local_event(bat_priv, TT_DEL, broadcast_addr);
+ else
+ tt_local_event(bat_priv, TT_DEL, tt_local_entry->addr);
+
tt_local_del(bat_priv, tt_local_entry, message);
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
@@ -473,7 +489,7 @@ static void tt_changes_list_free(struct bat_priv *bat_priv)
/* caller must hold orig_node recount */
int tt_global_add(struct bat_priv *bat_priv,
struct orig_node *orig_node,
- unsigned char *tt_addr, uint8_t ttvn)
+ unsigned char *tt_addr, uint8_t ttvn, bool roaming)
{
struct tt_global_entry *tt_global_entry;
struct tt_local_entry *tt_local_entry;
@@ -520,8 +536,9 @@ int tt_global_add(struct bat_priv *bat_priv,
tt_local_entry = tt_local_hash_find(bat_priv, tt_addr);

if (tt_local_entry)
- tt_local_del(bat_priv, tt_local_entry,
- "global tt received");
+ tt_local_remove(bat_priv, tt_global_entry->addr,
+ "global tt received", roaming);
+
spin_unlock_bh(&bat_priv->tt_lhash_lock);
return 1;
unlock:
@@ -905,6 +922,7 @@ out:
kfree(tt_req_node);
}
return ret;
+
unlock_tt:
spin_unlock_bh(&bat_priv->tt_req_list_lock);
return ret;
@@ -1249,7 +1267,7 @@ static void _tt_fill_gtable(struct bat_priv *bat_priv,
tt_ptr = tt_buff + (count * ETH_ALEN);

/* If we fail to allocate a new entry we return immediatly */
- if (!tt_global_add(bat_priv, orig_node, tt_ptr, ttvn))
+ if (!tt_global_add(bat_priv, orig_node, tt_ptr, ttvn, false))
return;
}
atomic_set(&orig_node->last_tt_ver_num, ttvn);
@@ -1303,7 +1321,8 @@ static void tt_update_changes(struct bat_priv *bat_priv,
"tt removed by tt_response");
else
if (!tt_global_add(bat_priv, orig_node,
- (tt_change + i)->addr, tt_response->ttvn))
+ (tt_change + i)->addr,
+ tt_response->ttvn, false))
return;
}

@@ -1382,16 +1401,118 @@ int tt_init(struct bat_priv *bat_priv)
return 1;
}

-void tt_free(struct bat_priv *bat_priv)
+static void tt_roam_list_free(struct bat_priv *bat_priv)
{
- cancel_delayed_work_sync(&bat_priv->tt_work);
+ struct tt_roam_node *node, *safe;

- tt_local_table_free(bat_priv);
- tt_global_table_free(bat_priv);
- tt_req_list_free(bat_priv);
- tt_changes_list_free(bat_priv);
+ spin_lock_bh(&bat_priv->tt_roam_list_lock);

- kfree(bat_priv->tt_buff);
+ list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
+ list_del(&node->list);
+ kfree(node);
+ }
+
+ spin_unlock_bh(&bat_priv->tt_roam_list_lock);
+}
+
+static void tt_roam_purge(struct bat_priv *bat_priv)
+{
+ struct tt_roam_node *node, *safe;
+
+ spin_lock_bh(&bat_priv->tt_roam_list_lock);
+ list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
+ if (!is_out_of_time(node->first_time,
+ ROAMING_MAX_TIME * 1000))
+ continue;
+
+ list_del(&node->list);
+ kfree(node);
+ }
+ spin_unlock_bh(&bat_priv->tt_roam_list_lock);
+}
+
+void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
+ struct orig_node *orig_node)
+{
+ struct neigh_node *neigh_node;
+ struct sk_buff *skb;
+ struct roam_adv_packet *roam_adv_packet;
+ struct tt_roam_node *tt_roam_node;
+ bool found = false;
+ int ret = 1;
+
+ spin_lock_bh(&bat_priv->tt_roam_list_lock);
+ /* The new tt_req will be issued only if I'm not waiting for a
+ * reply from the same orig_node yet */
+ list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
+ if (!compare_eth(tt_roam_node->addr, client))
+ continue;
+
+ if (is_out_of_time(tt_roam_node->first_time,
+ ROAMING_MAX_TIME * 1000))
+ continue;
+
+ if (!atomic_dec_not_zero(&tt_roam_node->counter))
+ /* Sorry, you roamed too many times! */
+ goto unlock;
+
+ found = true;
+ break;
+ }
+
+ if (!found) {
+ tt_roam_node = kmalloc(sizeof(struct tt_roam_node), GFP_ATOMIC);
+ if (!tt_roam_node)
+ goto unlock;
+
+ tt_roam_node->first_time = jiffies;
+ atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
+ memcpy(tt_roam_node->addr, client, ETH_ALEN);
+
+ list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
+ }
+ spin_unlock_bh(&bat_priv->tt_roam_list_lock);
+
+ skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
+ if (!skb)
+ goto free_skb;
+
+ skb_reserve(skb, ETH_HLEN);
+
+ roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
+ sizeof(struct roam_adv_packet));
+
+ roam_adv_packet->packet_type = BAT_ROAM_ADV;
+ roam_adv_packet->version = COMPAT_VERSION;
+ roam_adv_packet->ttl = TTL;
+ memcpy(roam_adv_packet->src,
+ bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
+ memcpy(roam_adv_packet->client, client, ETH_ALEN);
+
+ neigh_node = find_router(bat_priv, orig_node, NULL);
+ if (!neigh_node)
+ goto free_skb;
+
+ if (neigh_node->if_incoming->if_status != IF_ACTIVE)
+ goto free_neigh;
+
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
+ orig_node->orig, client, neigh_node->addr);
+
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = 0;
+
+free_neigh:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+free_skb:
+ if (ret)
+ kfree_skb(skb);
+ return;
+unlock:
+ spin_unlock_bh(&bat_priv->tt_roam_list_lock);
}

static void tt_purge(struct work_struct *work)
@@ -1403,6 +1524,20 @@ static void tt_purge(struct work_struct *work)

tt_local_purge(bat_priv);
tt_req_purge(bat_priv);
+ tt_roam_purge(bat_priv);

tt_start_timer(bat_priv);
}
+
+void tt_free(struct bat_priv *bat_priv)
+{
+ cancel_delayed_work_sync(&bat_priv->tt_work);
+
+ tt_local_table_free(bat_priv);
+ tt_global_table_free(bat_priv);
+ tt_req_list_free(bat_priv);
+ tt_changes_list_free(bat_priv);
+ tt_roam_list_free(bat_priv);
+
+ kfree(bat_priv->tt_buff);
+}
diff --git a/translation-table.h b/translation-table.h
index 4eef4f8..05ef22c 100644
--- a/translation-table.h
+++ b/translation-table.h
@@ -22,6 +22,7 @@
#ifndef _NET_BATMAN_ADV_TRANSLATION_TABLE_H_
#define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_

+struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr);
int tt_len(int changes_num);
void tt_changes_primary_if(struct bat_priv *bat_priv, uint8_t *old_addr,
uint8_t *new_addr);
@@ -30,14 +31,14 @@ int tt_changes_fill_buffer(struct bat_priv *bat_priv,
int tt_init(struct bat_priv *bat_priv);
void tt_local_add(struct net_device *soft_iface, uint8_t *addr);
void tt_local_remove(struct bat_priv *bat_priv,
- uint8_t *addr, char *message);
+ uint8_t *addr, char *message, bool roaming);
int tt_local_seq_print_text(struct seq_file *seq, void *offset);
void tt_global_add_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node,
unsigned char *tt_buff, int tt_buff_len);
int tt_global_add(struct bat_priv *bat_priv,
struct orig_node *orig_node, unsigned char *addr,
- uint8_t ttvn);
+ uint8_t ttvn, bool roaming);
int tt_global_seq_print_text(struct seq_file *seq, void *offset);
void tt_global_del_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node, char *message);
@@ -58,5 +59,7 @@ int send_tt_response(struct bat_priv *bat_priv,
bool is_my_client(struct bat_priv *bat_priv, uint8_t *addr);
void handle_tt_response(struct bat_priv *bat_priv,
struct tt_query_packet *tt_response);
+void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
+ struct orig_node *orig_node);

#endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */
diff --git a/types.h b/types.h
index 3a629a3..da7eda8 100644
--- a/types.h
+++ b/types.h
@@ -81,6 +81,14 @@ struct orig_node {
int16_t tt_buff_len;
spinlock_t tt_buff_lock;
atomic_t tt_size;
+ bool tt_poss_change; /* this flag is needed to detect an ongoing
+ * roaming event. If it is true, it means that
+ * in the last OGM interval I sent a Roaming_adv,
+ * so I have to check every packet going to it
+ * whether the destination is still a client of
+ * its or not, it will be reset as soon as I'll
+ * receive a new TTVN from it */
+
uint32_t last_real_seqno;
uint8_t last_ttl;
unsigned long bcast_bits[NUM_WORDS];
@@ -158,6 +166,13 @@ struct bat_priv {
atomic_t tt_ver_num;
atomic_t tt_ogm_append_cnt;
atomic_t tt_local_changes; /* changes registered in a OGM interval */
+ bool tt_poss_change; /* this flag is needed to detect an ongoing
+ * roaming event. If it is true, it means that
+ * in the last OGM interval I received a
+ * Roaming_adv, so I have to check every packet
+ * going to me whether the destination is still
+ * a client of mine or not, it will be reset as
+ * soon as I'll increase my TTVN */
char num_ifaces;
struct hlist_head softif_neigh_list;
struct softif_neigh __rcu *softif_neigh;
@@ -173,6 +188,7 @@ struct bat_priv {
struct hashtable_t *tt_local_hash;
struct hashtable_t *tt_global_hash;
struct list_head tt_req_list; /* list of pending tt_requests */
+ struct list_head tt_roam_list;
struct hashtable_t *vis_hash;
spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
spinlock_t forw_bcast_list_lock; /* protects */
@@ -180,6 +196,7 @@ struct bat_priv {
spinlock_t tt_lhash_lock; /* protects tt_local_hash */
spinlock_t tt_ghash_lock; /* protects tt_global_hash */
spinlock_t tt_req_list_lock; /* protects tt_req_list */
+ spinlock_t tt_roam_list_lock; /* protects tt_roam_list */
spinlock_t gw_list_lock; /* protects gw_list and curr_gw */
spinlock_t vis_hash_lock; /* protects vis_hash */
spinlock_t vis_list_lock; /* protects vis_info::recv_list */
@@ -239,6 +256,13 @@ struct tt_req_node {
struct list_head list;
};

+struct tt_roam_node {
+ uint8_t addr[ETH_ALEN];
+ atomic_t counter;
+ unsigned long first_time;
+ struct list_head list;
+};
+
/**
* forw_packet - structure for forw_list maintaining packets to be
* send/forwarded
--
1.7.3.4