Example #1
0
/* check for UNCLAIM frame, return 1 if handled */
static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
				 struct batadv_hard_iface *primary_if,
				 uint8_t *backbone_addr,
				 uint8_t *claim_addr, unsigned short vid)
{
	struct batadv_bla_backbone_gw *backbone_gw;

	/* unclaim in any case if it is our own */
	if (primary_if && batadv_compare_eth(backbone_addr,
					     primary_if->net_dev->dev_addr))
		batadv_bla_send_claim(bat_priv, claim_addr, vid,
				      BATADV_CLAIM_TYPE_UNCLAIM);

	backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);

	if (!backbone_gw)
		return 1;

	/* this must be an UNCLAIM frame */
	batadv_dbg(BATADV_DBG_BLA, bat_priv,
		   "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
		   claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);

	batadv_bla_del_claim(bat_priv, claim_addr, vid);
	batadv_backbone_gw_free_ref(backbone_gw);
	return 1;
}
Example #2
0
/**
 * batadv_bla_is_backbone_gw
 * @skb: the frame to be checked
 * @orig_node: the orig_node of the frame
 * @hdr_size: maximum length of the frame
 *
 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
 * if the orig_node is also a gateway on the soft interface, otherwise it
 * returns 0.
 */
int batadv_bla_is_backbone_gw(struct sk_buff *skb,
			      struct batadv_orig_node *orig_node, int hdr_size)
{
	struct ethhdr *ethhdr;
	struct vlan_ethhdr *vhdr;
	struct batadv_bla_backbone_gw *backbone_gw;
	short vid = -1;

	if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
		return 0;

	/* first, find out the vid. */
	if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
		return 0;

	ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);

	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
		if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
			return 0;

		vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
	}

	/* see if this originator is a backbone gw for this VLAN */
	backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
						orig_node->orig, vid);
	if (!backbone_gw)
		return 0;

	batadv_backbone_gw_free_ref(backbone_gw);
	return 1;
}
Example #3
0
/**
 * batadv_bla_get_backbone_gw
 * @bat_priv: the bat priv with all the soft interface information
 * @orig: the mac address of the originator
 * @vid: the VLAN ID
 *
 * searches for the backbone gw or creates a new one if it could not
 * be found.
 */
static struct batadv_backbone_gw *
batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
			   short vid)
{
	struct batadv_backbone_gw *entry;
	struct batadv_orig_node *orig_node;
	int hash_added;

	entry = batadv_backbone_hash_find(bat_priv, orig, vid);

	if (entry)
		return entry;

	batadv_dbg(BATADV_DBG_BLA, bat_priv,
		   "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
		   orig, vid);

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (!entry)
		return NULL;

	entry->vid = vid;
	entry->lasttime = jiffies;
	entry->crc = BATADV_BLA_CRC_INIT;
	entry->bat_priv = bat_priv;
	atomic_set(&entry->request_sent, 0);
	memcpy(entry->orig, orig, ETH_ALEN);

	/* one for the hash, one for returning */
	atomic_set(&entry->refcount, 2);

	hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
				     batadv_compare_backbone_gw,
				     batadv_choose_backbone_gw, entry,
				     &entry->hash_entry);

	if (unlikely(hash_added != 0)) {
		/* hash failed, free the structure */
		kfree(entry);
		return NULL;
	}

	/* this is a gateway now, remove any tt entries */
	orig_node = batadv_orig_hash_find(bat_priv, orig);
	if (orig_node) {
		batadv_tt_global_del_orig(bat_priv, orig_node,
					  "became a backbone gateway");
		batadv_orig_node_free_ref(orig_node);
	}
	return entry;
}
Example #4
0
/* @bat_priv: the bat priv with all the soft interface information
 * @vid: the vid where the request came on
 *
 * Repeat all of our own claims, and finally send an ANNOUNCE frame
 * to allow the requester another check if the CRC is correct now.
 */
static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
				      struct batadv_hard_iface *primary_if,
				      short vid)
{
	struct hlist_node *node;
	struct hlist_head *head;
	struct batadv_hashtable *hash;
	struct batadv_claim *claim;
	struct batadv_backbone_gw *backbone_gw;
	int i;

	batadv_dbg(BATADV_DBG_BLA, bat_priv,
		   "bla_answer_request(): received a claim request, send all of our own claims again\n");

	backbone_gw = batadv_backbone_hash_find(bat_priv,
						primary_if->net_dev->dev_addr,
						vid);
	if (!backbone_gw)
		return;

	hash = bat_priv->bla.claim_hash;
	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
			/* only own claims are interesting */
			if (claim->backbone_gw != backbone_gw)
				continue;

			batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
					      BATADV_CLAIM_TYPE_CLAIM);
		}
		rcu_read_unlock();
	}

	/* finally, send an announcement frame */
	batadv_bla_send_announce(bat_priv, backbone_gw);
	batadv_backbone_gw_free_ref(backbone_gw);
}
Example #5
0
/**
 * batadv_bla_is_backbone_gw
 * @skb: the frame to be checked
 * @orig_node: the orig_node of the frame
 * @hdr_size: maximum length of the frame
 *
 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
 * if the orig_node is also a gateway on the soft interface, otherwise it
 * returns 0.
 */
int batadv_bla_is_backbone_gw(struct sk_buff *skb,
			      struct batadv_orig_node *orig_node, int hdr_size)
{
	struct batadv_bla_backbone_gw *backbone_gw;
	unsigned short vid;

	if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
		return 0;

	/* first, find out the vid. */
	if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
		return 0;

	vid = batadv_get_vid(skb, hdr_size);

	/* see if this originator is a backbone gw for this VLAN */
	backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
						orig_node->orig, vid);
	if (!backbone_gw)
		return 0;

	batadv_backbone_gw_free_ref(backbone_gw);
	return 1;
}
Example #6
0
/**
 * batadv_bla_get_backbone_gw
 * @bat_priv: the bat priv with all the soft interface information
 * @orig: the mac address of the originator
 * @vid: the VLAN ID
 * @own_backbone: set if the requested backbone is local
 *
 * searches for the backbone gw or creates a new one if it could not
 * be found.
 */
static struct batadv_bla_backbone_gw *
batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
			   unsigned short vid, bool own_backbone)
{
	struct batadv_bla_backbone_gw *entry;
	struct batadv_orig_node *orig_node;
	int hash_added;

	entry = batadv_backbone_hash_find(bat_priv, orig, vid);

	if (entry)
		return entry;

	batadv_dbg(BATADV_DBG_BLA, bat_priv,
		   "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
		   orig, BATADV_PRINT_VID(vid));

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (!entry)
		return NULL;

	entry->vid = vid;
	entry->lasttime = jiffies;
	entry->crc = BATADV_BLA_CRC_INIT;
	entry->bat_priv = bat_priv;
	atomic_set(&entry->request_sent, 0);
	atomic_set(&entry->wait_periods, 0);
	ether_addr_copy(entry->orig, orig);

	/* one for the hash, one for returning */
	atomic_set(&entry->refcount, 2);

	hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
				     batadv_compare_backbone_gw,
				     batadv_choose_backbone_gw, entry,
				     &entry->hash_entry);

	if (unlikely(hash_added != 0)) {
		/* hash failed, free the structure */
		kfree(entry);
		return NULL;
	}

	/* this is a gateway now, remove any TT entry on this VLAN */
	orig_node = batadv_orig_hash_find(bat_priv, orig);
	if (orig_node) {
		batadv_tt_global_del_orig(bat_priv, orig_node, vid,
					  "became a backbone gateway");
		batadv_orig_node_free_ref(orig_node);
	}

	if (own_backbone) {
		batadv_bla_send_announce(bat_priv, entry);

		/* this will be decreased in the worker thread */
		atomic_inc(&entry->request_sent);
		atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
		atomic_inc(&bat_priv->bla.num_requests);
	}

	return entry;
}