/* 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;
}
/**
* 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;
}
/**
* 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;
}
/* @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);
}
/**
* 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;
}
/**
* 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;
}
