batman-adv: change VID semantic in the BLA code

In order to make batman-adv fully vlan aware later, the
semantic used for variables storing the VLAN ID values has
to be changed in order to be adapted to the new one which
will be used batman-adv wide.

In particular, the VID has to be an "_unsigned_ short int"
and its 4 MSB will be used as a flag bitfield, while the
remaining 12 bits are used to store the real VID value

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>

1 files changed, 27 insertions, 24 deletions

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 082189e2e40..7354063567b 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -180,7 +180,7 @@ static struct batadv_bla_claim
  */
 static struct batadv_bla_backbone_gw *
 batadv_backbone_hash_find(struct batadv_priv *bat_priv,
-			  uint8_t *addr, short vid)
+			  uint8_t *addr, unsigned short vid)
 {
 	struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
 	struct hlist_head *head;
@@ -257,7 +257,7 @@ batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
  * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
  */
 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
-				  short vid, int claimtype)
+				  unsigned short vid, int claimtype)
 {
 	struct sk_buff *skb;
 	struct ethhdr *ethhdr;
@@ -335,13 +335,14 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 		memcpy(hw_src, mac, ETH_ALEN);
 		memcpy(ethhdr->h_dest, mac, ETH_ALEN);
 		batadv_dbg(BATADV_DBG_BLA, bat_priv,
-			   "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
+			   "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
 			   ethhdr->h_source, ethhdr->h_dest, vid);
 		break;
 	}
 
-	if (vid != -1)
-		skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), vid);
+	if (vid & BATADV_VLAN_HAS_TAG)
+		skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
+				      vid & VLAN_VID_MASK);
 
 	skb_reset_mac_header(skb);
 	skb->protocol = eth_type_trans(skb, soft_iface);
@@ -367,7 +368,7 @@ out:
  */
 static struct batadv_bla_backbone_gw *
 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
-			   short vid, bool own_backbone)
+			   unsigned short vid, bool own_backbone)
 {
 	struct batadv_bla_backbone_gw *entry;
 	struct batadv_orig_node *orig_node;
@@ -434,7 +435,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
 static void
 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
 				  struct batadv_hard_iface *primary_if,
-				  short vid)
+				  unsigned short vid)
 {
 	struct batadv_bla_backbone_gw *backbone_gw;
 
@@ -456,7 +457,7 @@ batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
  */
 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
 				      struct batadv_hard_iface *primary_if,
-				      short vid)
+				      unsigned short vid)
 {
 	struct hlist_head *head;
 	struct batadv_hashtable *hash;
@@ -547,7 +548,7 @@ static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
  * @backbone_gw: the backbone gateway which claims it
  */
 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
-				 const uint8_t *mac, const short vid,
+				 const uint8_t *mac, const unsigned short vid,
 				 struct batadv_bla_backbone_gw *backbone_gw)
 {
 	struct batadv_bla_claim *claim;
@@ -611,7 +612,7 @@ claim_free_ref:
  * given mac address and vid.
  */
 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
-				 const uint8_t *mac, const short vid)
+				 const uint8_t *mac, const unsigned short vid)
 {
 	struct batadv_bla_claim search_claim, *claim;
 
@@ -637,7 +638,7 @@ static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
 /* check for ANNOUNCE frame, return 1 if handled */
 static int batadv_handle_announce(struct batadv_priv *bat_priv,
 				  uint8_t *an_addr, uint8_t *backbone_addr,
-				  short vid)
+				  unsigned short vid)
 {
 	struct batadv_bla_backbone_gw *backbone_gw;
 	uint16_t crc;
@@ -685,7 +686,7 @@ static int batadv_handle_announce(struct batadv_priv *bat_priv,
 static int batadv_handle_request(struct batadv_priv *bat_priv,
 				 struct batadv_hard_iface *primary_if,
 				 uint8_t *backbone_addr,
-				 struct ethhdr *ethhdr, short vid)
+				 struct ethhdr *ethhdr, unsigned short vid)
 {
 	/* check for REQUEST frame */
 	if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
@@ -709,7 +710,7 @@ static int batadv_handle_request(struct batadv_priv *bat_priv,
 static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
 				 struct batadv_hard_iface *primary_if,
 				 uint8_t *backbone_addr,
-				 uint8_t *claim_addr, short vid)
+				 uint8_t *claim_addr, unsigned short vid)
 {
 	struct batadv_bla_backbone_gw *backbone_gw;
 
@@ -738,7 +739,7 @@ static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
 static int batadv_handle_claim(struct batadv_priv *bat_priv,
 			       struct batadv_hard_iface *primary_if,
 			       uint8_t *backbone_addr, uint8_t *claim_addr,
-			       short vid)
+			       unsigned short vid)
 {
 	struct batadv_bla_backbone_gw *backbone_gw;
 
@@ -861,7 +862,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
 	struct batadv_bla_claim_dst *bla_dst;
 	uint16_t proto;
 	int headlen;
-	short vid = -1;
+	unsigned short vid = BATADV_NO_FLAGS;
 	int ret;
 
 	ethhdr = eth_hdr(skb);
@@ -869,6 +870,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
 		vhdr = (struct vlan_ethhdr *)ethhdr;
 		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+		vid |= BATADV_VLAN_HAS_TAG;
 		proto = ntohs(vhdr->h_vlan_encapsulated_proto);
 		headlen = sizeof(*vhdr);
 	} else {
@@ -1358,7 +1360,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 	struct ethhdr *ethhdr;
 	struct vlan_ethhdr *vhdr;
 	struct batadv_bla_backbone_gw *backbone_gw;
-	short vid = -1;
+	unsigned short vid = BATADV_NO_FLAGS;
 
 	if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
 		return 0;
@@ -1375,6 +1377,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 
 		vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
 		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+		vid |= BATADV_VLAN_HAS_TAG;
 	}
 
 	/* see if this originator is a backbone gw for this VLAN */
@@ -1424,8 +1427,8 @@ void batadv_bla_free(struct batadv_priv *bat_priv)
  * returns 1, otherwise it returns 0 and the caller shall further
  * process the skb.
  */
-int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid,
-		  bool is_bcast)
+int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		  unsigned short vid, bool is_bcast)
 {
 	struct ethhdr *ethhdr;
 	struct batadv_bla_claim search_claim, *claim = NULL;
@@ -1519,7 +1522,8 @@ out:
  * returns 1, otherwise it returns 0 and the caller shall further
  * process the skb.
  */
-int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid)
+int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		  unsigned short vid)
 {
 	struct ethhdr *ethhdr;
 	struct batadv_bla_claim search_claim, *claim = NULL;
@@ -1623,7 +1627,7 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
 		hlist_for_each_entry_rcu(claim, head, hash_entry) {
 			is_own = batadv_compare_eth(claim->backbone_gw->orig,
 						    primary_addr);
-			seq_printf(seq,	" * %pM on % 5d by %pM [%c] (%#.4x)\n",
+			seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
 				   claim->addr, claim->vid,
 				   claim->backbone_gw->orig,
 				   (is_own ? 'x' : ' '),
@@ -1676,10 +1680,9 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
 			if (is_own)
 				continue;
 
-			seq_printf(seq,
-				   " * %pM on % 5d % 4i.%03is (%#.4x)\n",
-				   backbone_gw->orig, backbone_gw->vid,
-				   secs, msecs, backbone_gw->crc);
+			seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
+				   backbone_gw->orig, backbone_gw->vid, secs,
+				   msecs, backbone_gw->crc);
 		}
 		rcu_read_unlock();
 	}