bridge: vlan tunnel id info range fill size calc cleanups

This fixes a bug and cleans up tunnelid range size
calculation code by using consistent variable names
and checks in size calculation and fill functions.

tested for a few cases of vlan-vni range mappings:
(output from patched iproute2):
$bridge vlan showtunnel
port     vid        tunid
vxlan0   100-105    1000-1005
         200        2000
         210        2100
         211-213    2100-2102
         214        2104
         216-217    2108-2109
         219        2119

Fixes: efa5356b0d97 ("bridge: per vlan dst_metadata netlink support")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_netlink_tunnel.c b/net/bridge/br_netlink_tunnel.c
index f384735..c913491 100644 (file)
--- a/net/bridge/br_netlink_tunnel.c
+++ b/net/bridge/br_netlink_tunnel.c
@@ -30,18 +30,18 @@ static size_t __get_vlan_tinfo_size(void)
                  nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
 }
 
-static bool vlan_tunnel_id_isrange(struct net_bridge_vlan *v,
-                                  struct net_bridge_vlan *v_end)
+static bool vlan_tunid_inrange(struct net_bridge_vlan *v_curr,
+                              struct net_bridge_vlan *v_last)
 {
-       __be32 tunid_curr = tunnel_id_to_key32(v->tinfo.tunnel_id);
-       __be32 tunid_end = tunnel_id_to_key32(v_end->tinfo.tunnel_id);
+       __be32 tunid_curr = tunnel_id_to_key32(v_curr->tinfo.tunnel_id);
+       __be32 tunid_last = tunnel_id_to_key32(v_last->tinfo.tunnel_id);
 
-       return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_end)) == 1;
+       return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_last)) == 1;
 }
 
 static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
 {
-       struct net_bridge_vlan *v, *v_start = NULL, *v_end = NULL;
+       struct net_bridge_vlan *v, *vtbegin = NULL, *vtend = NULL;
        int num_tinfos = 0;
 
        /* Count number of vlan infos */
@@ -50,27 +50,25 @@ static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
                if (!br_vlan_should_use(v) || !v->tinfo.tunnel_id)
                        continue;
 
-               if (!v_start) {
+               if (!vtbegin) {
                        goto initvars;
-               } else if ((v->vid - v_end->vid) == 1 &&
-                          vlan_tunnel_id_isrange(v_end, v) == 1) {
-                       v_end = v;
+               } else if ((v->vid - vtend->vid) == 1 &&
+                          vlan_tunid_inrange(v, vtend)) {
+                       vtend = v;
                        continue;
                } else {
-                       if ((v_end->vid - v->vid) > 0 &&
-                           vlan_tunnel_id_isrange(v_end, v) > 0)
+                       if ((vtend->vid - vtbegin->vid) > 0)
                                num_tinfos += 2;
                        else
                                num_tinfos += 1;
                }
 initvars:
-               v_start = v;
-               v_end = v;
+               vtbegin = v;
+               vtend = v;
        }
 
-       if (v_start) {
-               if ((v_end->vid - v->vid) > 0 &&
-                   vlan_tunnel_id_isrange(v_end, v) > 0)
+       if (vtbegin && vtend) {
+               if ((vtend->vid - vtbegin->vid) > 0)
                        num_tinfos += 2;
                else
                        num_tinfos += 1;
@@ -171,7 +169,7 @@ int br_fill_vlan_tunnel_info(struct sk_buff *skb,
                if (!vtbegin) {
                        goto initvars;
                } else if ((v->vid - vtend->vid) == 1 &&
-                           vlan_tunnel_id_isrange(v, vtend)) {
+                           vlan_tunid_inrange(v, vtend)) {
                        vtend = v;
                        continue;
                } else {