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Commit db08e6e5 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Antonio Quartulli
Browse files

batman-adv: allow multiple entries in tt_global_entries 



as backbone gateways will all independently announce the same clients,
also the tt global table must be able to hold multiple originators per
client entry.

Signed-off-by: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarAntonio Quartulli <ordex@autistici.org>
parent 9bf8e4d4

net/batman-adv/translation-table.c

+303 −92
Original line number Diff line number Diff line
@@ -32,10 +32,8 @@ 


static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,

			  struct orig_node *orig_node);

static void _tt_global_del(struct bat_priv *bat_priv,

			   struct tt_global_entry *tt_global_entry,

			   const char *message);

static void tt_purge(struct work_struct *work);

static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);



/* returns 1 if they are the same mac addr */

static int compare_tt(const struct hlist_node *node, const void *data2)
@@ -125,18 +123,32 @@ static void tt_global_entry_free_rcu(struct rcu_head *rcu) 
	tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,

				       common);



	if (tt_global_entry->orig_node)

		orig_node_free_ref(tt_global_entry->orig_node);



	kfree(tt_global_entry);

}



static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)

{

	if (atomic_dec_and_test(&tt_global_entry->common.refcount))

	if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {

		tt_global_del_orig_list(tt_global_entry);

		call_rcu(&tt_global_entry->common.rcu,

			 tt_global_entry_free_rcu);

	}

}



static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)

{

	struct tt_orig_list_entry *orig_entry;



	orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);

	atomic_dec(&orig_entry->orig_node->tt_size);

	orig_node_free_ref(orig_entry->orig_node);

	kfree(orig_entry);

}



static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)

{

	call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);

}



static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,

			   uint8_t flags)
@@ -184,6 +196,9 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, 
	struct bat_priv *bat_priv = netdev_priv(soft_iface);

	struct tt_local_entry *tt_local_entry = NULL;

	struct tt_global_entry *tt_global_entry = NULL;

	struct hlist_head *head;

	struct hlist_node *node;

	struct tt_orig_list_entry *orig_entry;

	int hash_added;



	tt_local_entry = tt_local_hash_find(bat_priv, addr);
@@ -234,14 +249,21 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr, 


	/* Check whether it is a roaming! */

	if (tt_global_entry) {

		/* This node is probably going to update its tt table */

		tt_global_entry->orig_node->tt_poss_change = true;

		/* The global entry has to be marked as ROAMING and has to be

		 * kept for consistency purpose */

		/* These node are probably going to update their tt table */

		head = &tt_global_entry->orig_list;

		rcu_read_lock();

		hlist_for_each_entry_rcu(orig_entry, node, head, list) {

			orig_entry->orig_node->tt_poss_change = true;



			send_roam_adv(bat_priv, tt_global_entry->common.addr,

				      orig_entry->orig_node);

		}

		rcu_read_unlock();

		/* The global entry has to be marked as ROAMING and

		 * has to be kept for consistency purpose

		 */

		tt_global_entry->common.flags |= TT_CLIENT_ROAM;

		tt_global_entry->roam_at = jiffies;

		send_roam_adv(bat_priv, tt_global_entry->common.addr,

			      tt_global_entry->orig_node);

	}

out:

	if (tt_local_entry)
@@ -492,33 +514,76 @@ static void tt_changes_list_free(struct bat_priv *bat_priv) 
	spin_unlock_bh(&bat_priv->tt_changes_list_lock);

}



/* find out if an orig_node is already in the list of a tt_global_entry.

 * returns 1 if found, 0 otherwise

 */

static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,

				     const struct orig_node *orig_node)

{

	struct tt_orig_list_entry *tmp_orig_entry;

	const struct hlist_head *head;

	struct hlist_node *node;

	bool found = false;



	rcu_read_lock();

	head = &entry->orig_list;

	hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {

		if (tmp_orig_entry->orig_node == orig_node) {

			found = true;

			break;

		}

	}

	rcu_read_unlock();

	return found;

}



static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,

				     struct orig_node *orig_node,

				     int ttvn)

{

	struct tt_orig_list_entry *orig_entry;



	orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);

	if (!orig_entry)

		return;



	INIT_HLIST_NODE(&orig_entry->list);

	atomic_inc(&orig_node->refcount);

	atomic_inc(&orig_node->tt_size);

	orig_entry->orig_node = orig_node;

	orig_entry->ttvn = ttvn;



	spin_lock_bh(&tt_global_entry->list_lock);

	hlist_add_head_rcu(&orig_entry->list,

			   &tt_global_entry->orig_list);

	spin_unlock_bh(&tt_global_entry->list_lock);

}



/* caller must hold orig_node refcount */

int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,

		  const unsigned char *tt_addr, uint8_t ttvn, bool roaming,

		  bool wifi)

{

	struct tt_global_entry *tt_global_entry;

	struct orig_node *orig_node_tmp;

	struct tt_global_entry *tt_global_entry = NULL;

	int ret = 0;

	int hash_added;



	tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);



	if (!tt_global_entry) {

		tt_global_entry =

			kmalloc(sizeof(*tt_global_entry),

		tt_global_entry = kzalloc(sizeof(*tt_global_entry),

					  GFP_ATOMIC);

		if (!tt_global_entry)

			goto out;



		memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);



		tt_global_entry->common.flags = NO_FLAGS;

		atomic_set(&tt_global_entry->common.refcount, 2);

		/* Assign the new orig_node */

		atomic_inc(&orig_node->refcount);

		tt_global_entry->orig_node = orig_node;

		tt_global_entry->ttvn = ttvn;

		tt_global_entry->roam_at = 0;

		atomic_set(&tt_global_entry->common.refcount, 2);



		INIT_HLIST_HEAD(&tt_global_entry->orig_list);

		spin_lock_init(&tt_global_entry->list_lock);



		hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,

				 choose_orig, &tt_global_entry->common,
@@ -529,21 +594,29 @@ int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, 
			tt_global_entry_free_ref(tt_global_entry);

			goto out_remove;

		}

		atomic_inc(&orig_node->tt_size);



		tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);

	} else {

		if (tt_global_entry->orig_node != orig_node) {

			atomic_dec(&tt_global_entry->orig_node->tt_size);

			orig_node_tmp = tt_global_entry->orig_node;

			atomic_inc(&orig_node->refcount);

			tt_global_entry->orig_node = orig_node;

			orig_node_free_ref(orig_node_tmp);

			atomic_inc(&orig_node->tt_size);

		}

		tt_global_entry->common.flags = NO_FLAGS;

		tt_global_entry->ttvn = ttvn;

		/* there is already a global entry, use this one. */



		/* If there is the 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 (tt_global_entry->common.flags & TT_CLIENT_ROAM) {

			tt_global_del_orig_list(tt_global_entry);

			tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;

			tt_global_entry->roam_at = 0;

		}



		if (!tt_global_entry_has_orig(tt_global_entry, orig_node))

			tt_global_add_orig_entry(tt_global_entry, orig_node,

						 ttvn);

	}



	if (wifi)

		tt_global_entry->common.flags |= TT_CLIENT_WIFI;
@@ -562,6 +635,34 @@ int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, 
	return ret;

}



/* print all orig nodes who announce the address for this global entry.

 * it is assumed that the caller holds rcu_read_lock();

 */

static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,

				  struct seq_file *seq)

{

	struct hlist_head *head;

	struct hlist_node *node;

	struct tt_orig_list_entry *orig_entry;

	struct tt_common_entry *tt_common_entry;

	uint16_t flags;

	uint8_t last_ttvn;



	tt_common_entry = &tt_global_entry->common;



	head = &tt_global_entry->orig_list;



	hlist_for_each_entry_rcu(orig_entry, node, head, list) {

		flags = tt_common_entry->flags;

		last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);

		seq_printf(seq, " * %pM  (%3u) via %pM     (%3u)   [%c%c]\n",

			   tt_global_entry->common.addr, orig_entry->ttvn,

			   orig_entry->orig_node->orig, last_ttvn,

			   (flags & TT_CLIENT_ROAM ? 'R' : '.'),

			   (flags & TT_CLIENT_WIFI ? 'W' : '.'));

	}

}



int tt_global_seq_print_text(struct seq_file *seq, void *offset)

{

	struct net_device *net_dev = (struct net_device *)seq->private;
@@ -605,18 +706,7 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset) 
			tt_global_entry = container_of(tt_common_entry,

						       struct tt_global_entry,

						       common);

			seq_printf(seq,

				   " * %pM  (%3u) via %pM     (%3u)   [%c%c]\n",

				   tt_global_entry->common.addr,

				   tt_global_entry->ttvn,

				   tt_global_entry->orig_node->orig,

				   (uint8_t) atomic_read(

						&tt_global_entry->orig_node->

						last_ttvn),

				   (tt_global_entry->common.flags &

				    TT_CLIENT_ROAM ? 'R' : '.'),

				   (tt_global_entry->common.flags &

				    TT_CLIENT_WIFI ? 'W' : '.'));

			tt_global_print_entry(tt_global_entry, seq);

		}

		rcu_read_unlock();

	}
@@ -626,27 +716,103 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset) 
	return ret;

}



static void _tt_global_del(struct bat_priv *bat_priv,

/* deletes the orig list of a tt_global_entry */

static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)

{

	struct hlist_head *head;

	struct hlist_node *node, *safe;

	struct 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, node, safe, head, list) {

		hlist_del_rcu(node);

		tt_orig_list_entry_free_ref(orig_entry);

	}

	spin_unlock_bh(&tt_global_entry->list_lock);



}



static void tt_global_del_orig_entry(struct bat_priv *bat_priv,

				     struct tt_global_entry *tt_global_entry,

				     struct orig_node *orig_node,

				     const char *message)

{

	if (!tt_global_entry)

		goto out;

	struct hlist_head *head;

	struct hlist_node *node, *safe;

	struct 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, node, safe, head, list) {

		if (orig_entry->orig_node == orig_node) {

			bat_dbg(DBG_TT, bat_priv,

		"Deleting global tt entry %pM (via %pM): %s\n",

		tt_global_entry->common.addr, tt_global_entry->orig_node->orig,

				"Deleting %pM from global tt entry %pM: %s\n",

				orig_node->orig, tt_global_entry->common.addr,

				message);

			hlist_del_rcu(node);

			tt_orig_list_entry_free_ref(orig_entry);

		}

	}

	spin_unlock_bh(&tt_global_entry->list_lock);

}



	atomic_dec(&tt_global_entry->orig_node->tt_size);

static void tt_global_del_struct(struct bat_priv *bat_priv,

				 struct tt_global_entry *tt_global_entry,

				 const char *message)

{

	bat_dbg(DBG_TT, bat_priv,

		"Deleting global tt entry %pM: %s\n",

		tt_global_entry->common.addr, message);



	hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,

		    tt_global_entry->common.addr);

out:

	if (tt_global_entry)

	tt_global_entry_free_ref(tt_global_entry);



}



/* 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 TT_CLIENT_ROAM flag and the timer,

 * otherwise we simply remove the originator scheduled for deletion.

 */

static void tt_global_del_roaming(struct bat_priv *bat_priv,

				  struct tt_global_entry *tt_global_entry,

				  struct orig_node *orig_node,

				  const char *message)

{

	bool last_entry = true;

	struct hlist_head *head;

	struct hlist_node *node;

	struct 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, node, 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 |= 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.

		 */

		tt_global_del_orig_entry(bat_priv, tt_global_entry,

					 orig_node, message);

}







static void tt_global_del(struct bat_priv *bat_priv,

			  struct orig_node *orig_node,

			  const unsigned char *addr,
@@ -656,30 +822,44 @@ static void tt_global_del(struct bat_priv *bat_priv, 
	struct tt_local_entry *tt_local_entry = NULL;



	tt_global_entry = tt_global_hash_find(bat_priv, addr);

	if (!tt_global_entry || tt_global_entry->orig_node != orig_node)

	if (!tt_global_entry)

		goto out;



	if (!roaming)

		goto out_del;

	if (!roaming) {

		tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,

					 message);



		if (hlist_empty(&tt_global_entry->orig_list))

			tt_global_del_struct(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 => we mark

	 * 1) the client roamed from node A to node B => if there

	 *    is only one originator left for this client, we mark

	 *    it with 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. */



	tt_local_entry = tt_local_hash_find(bat_priv,

					    tt_global_entry->common.addr);

	if (!tt_local_entry) {

		tt_global_entry->common.flags |= TT_CLIENT_ROAM;

		tt_global_entry->roam_at = jiffies;

		goto out;

	}

	if (tt_local_entry) {

		/* local entry exists, case 2: client roamed to us. */

		tt_global_del_orig_list(tt_global_entry);

		tt_global_del_struct(bat_priv, tt_global_entry, message);

	} else

		/* no local entry exists, case 1: check for roaming */

		tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,

				      message);



out_del:

	_tt_global_del(bat_priv, tt_global_entry, message);



out:

	if (tt_global_entry)
@@ -712,11 +892,14 @@ void tt_global_del_orig(struct bat_priv *bat_priv, 
			tt_global_entry = container_of(tt_common_entry,

						       struct tt_global_entry,

						       common);

			if (tt_global_entry->orig_node == orig_node) {



			tt_global_del_orig_entry(bat_priv, tt_global_entry,

						 orig_node, message);



			if (hlist_empty(&tt_global_entry->orig_list)) {

				bat_dbg(DBG_TT, bat_priv,

					"Deleting global tt entry %pM (via %pM): %s\n",

					"Deleting global tt entry %pM: %s\n",

					tt_global_entry->common.addr,

					tt_global_entry->orig_node->orig,

					message);

				hlist_del_rcu(node);

				tt_global_entry_free_ref(tt_global_entry);
@@ -757,7 +940,7 @@ static void tt_global_roam_purge(struct bat_priv *bat_priv) 
			bat_dbg(DBG_TT, bat_priv,

				"Deleting global tt entry (%pM): Roaming timeout\n",

				tt_global_entry->common.addr);

			atomic_dec(&tt_global_entry->orig_node->tt_size);



			hlist_del_rcu(node);

			tt_global_entry_free_ref(tt_global_entry);

		}
@@ -820,6 +1003,11 @@ struct orig_node *transtable_search(struct bat_priv *bat_priv, 
	struct tt_local_entry *tt_local_entry = NULL;

	struct tt_global_entry *tt_global_entry = NULL;

	struct orig_node *orig_node = NULL;

	struct neigh_node *router = NULL;

	struct hlist_head *head;

	struct hlist_node *node;

	struct tt_orig_list_entry *orig_entry;

	int best_tq;



	if (src && atomic_read(&bat_priv->ap_isolation)) {

		tt_local_entry = tt_local_hash_find(bat_priv, src);
@@ -836,11 +1024,25 @@ struct orig_node *transtable_search(struct bat_priv *bat_priv, 
	if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))

		goto out;



	if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))

		goto out;

	best_tq = 0;



	orig_node = tt_global_entry->orig_node;

	rcu_read_lock();

	head = &tt_global_entry->orig_list;

	hlist_for_each_entry_rcu(orig_entry, node, head, list) {

		router = orig_node_get_router(orig_entry->orig_node);

		if (!router)

			continue;



		if (router->tq_avg > best_tq) {

			orig_node = orig_entry->orig_node;

			best_tq = router->tq_avg;

		}

		neigh_node_free_ref(router);

	}

	/* found anything? */

	if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))

		orig_node = NULL;

	rcu_read_unlock();

out:

	if (tt_global_entry)

		tt_global_entry_free_ref(tt_global_entry);
@@ -872,21 +1074,27 @@ static uint16_t tt_global_crc(struct bat_priv *bat_priv, 
			tt_global_entry = container_of(tt_common_entry,

						       struct tt_global_entry,

						       common);

			if (compare_eth(tt_global_entry->orig_node,

					orig_node)) {

			/* 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_entry->flags & TT_CLIENT_ROAM)

			 * global crc

			 */

			if (tt_global_entry->common.flags & TT_CLIENT_ROAM)

				continue;



			/* find out if this global entry is announced by this

			 * originator

			 */

			if (!tt_global_entry_has_orig(tt_global_entry,

						      orig_node))

				continue;



			total_one = 0;

			for (j = 0; j < ETH_ALEN; j++)

				total_one = crc16_byte(total_one,

						tt_common_entry->addr[j]);

					tt_global_entry->common.addr[j]);

			total ^= total_one;

		}

		}

		rcu_read_unlock();

	}
@@ -1026,7 +1234,7 @@ static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr) 
	tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,

				       common);



	return (tt_global_entry->orig_node == orig_node);

	return tt_global_entry_has_orig(tt_global_entry, orig_node);

}



static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
@@ -1802,6 +2010,8 @@ void tt_commit_changes(struct bat_priv *bat_priv) 


	/* Increment the TTVN only once per OGM interval */

	atomic_inc(&bat_priv->ttvn);

	bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",

		(uint8_t)atomic_read(&bat_priv->ttvn));

	bat_priv->tt_poss_change = false;

}
@@ -1879,6 +2089,7 @@ void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, 
	} else {

		/* if we missed more than one change or our tables are not

		 * in sync anymore -> request fresh tt data */



		if (!orig_node->tt_initialised || ttvn != orig_ttvn ||

		    orig_node->tt_crc != tt_crc) {

request_table:

net/batman-adv/types.h

+8 −1
Original line number Diff line number Diff line
@@ -241,9 +241,16 @@ struct tt_local_entry { 


struct tt_global_entry {

	struct tt_common_entry common;

	struct hlist_head orig_list;

	spinlock_t list_lock;	/* protects the list */

	unsigned long roam_at; /* time at which TT_GLOBAL_ROAM was set */

};



struct tt_orig_list_entry {

	struct orig_node *orig_node;

	uint8_t ttvn;

	unsigned long roam_at; /* time at which TT_GLOBAL_ROAM was set */

	struct rcu_head rcu;

	struct hlist_node list;

};



struct backbone_gw {