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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2020-03-17 14:08:36 +0200
committerDavid S. Miller <davem@davemloft.net>2020-03-17 22:47:12 -0700
commit569da08228086ac6f7053d71c6cb713c1f115209 (patch)
treecccd412e56c23ec98a2ead61f057611f13f79af1 /net/bridge/br_vlan_options.c
parent188c67dd1906eea5542268e4513ad6253fbf9297 (diff)
downloadlinux-569da08228086ac6f7053d71c6cb713c1f115209.tar.bz2
net: bridge: vlan options: add support for tunnel mapping set/del
This patch adds support for manipulating vlan/tunnel mappings. The tunnel ids are globally unique and are one per-vlan. There were two trickier issues - first in order to support vlan ranges we have to compute the current tunnel id in the following way: - base tunnel id (attr) + current vlan id - starting vlan id This is in line how the old API does vlan/tunnel mapping with ranges. We already have the vlan range present, so it's redundant to add another attribute for the tunnel range end. It's simply base tunnel id + vlan range. And second to support removing mappings we need an out-of-band way to tell the option manipulating function because there are no special/reserved tunnel id values, so we use a vlan flag to denote the operation is tunnel mapping removal. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_vlan_options.c')
-rw-r--r--net/bridge/br_vlan_options.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/net/bridge/br_vlan_options.c b/net/bridge/br_vlan_options.c
index d3618da32b8e..138e180cf4d8 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -85,6 +85,40 @@ static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
return 0;
}
+static int br_vlan_modify_tunnel(const struct net_bridge_port *p,
+ struct net_bridge_vlan *v,
+ struct nlattr **tb,
+ bool *changed,
+ struct netlink_ext_ack *extack)
+{
+ struct bridge_vlan_info *vinfo;
+ int cmdmap;
+ u32 tun_id;
+
+ if (!p) {
+ NL_SET_ERR_MSG_MOD(extack, "Can't modify tunnel mapping of non-port vlans");
+ return -EINVAL;
+ }
+ if (!(p->flags & BR_VLAN_TUNNEL)) {
+ NL_SET_ERR_MSG_MOD(extack, "Port doesn't have tunnel flag set");
+ return -EINVAL;
+ }
+
+ /* vlan info attribute is guaranteed by br_vlan_rtm_process_one */
+ vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
+ cmdmap = vinfo->flags & BRIDGE_VLAN_INFO_REMOVE_TUN ? RTM_DELLINK :
+ RTM_SETLINK;
+ /* when working on vlan ranges this represents the starting tunnel id */
+ tun_id = nla_get_u32(tb[BRIDGE_VLANDB_ENTRY_TUNNEL_ID]);
+ /* tunnel ids are mapped to each vlan in increasing order,
+ * the starting vlan is in BRIDGE_VLANDB_ENTRY_INFO and v is the
+ * current vlan, so we compute: tun_id + v - vinfo->vid
+ */
+ tun_id += v->vid - vinfo->vid;
+
+ return br_vlan_tunnel_info(p, cmdmap, v->vid, tun_id, changed);
+}
+
static int br_vlan_process_one_opts(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
@@ -103,6 +137,11 @@ static int br_vlan_process_one_opts(const struct net_bridge *br,
if (err)
return err;
}
+ if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_ID]) {
+ err = br_vlan_modify_tunnel(p, v, tb, changed, extack);
+ if (err)
+ return err;
+ }
return 0;
}