From: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>
Since the MDB add/del code expects an exact struct br_mdb_entry we can't
really add any extensions, thus add a new nested attribute at the level of
MDBA_SET_ENTRY called MDBA_SET_ENTRY_ATTRS which will be used to pass
all new options via netlink attributes. This patch doesn't change
anything functionally since the new attribute is not used yet, only
parsed.
Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>
---
include/uapi/linux/if_bridge.h | 12 ++++++++++++
net/bridge/br_mdb.c | 22 +++++++++++++++++++---
2 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 75a2ac479247..dc52f8cffa0d 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -530,10 +530,22 @@ struct br_mdb_entry {
enum {
MDBA_SET_ENTRY_UNSPEC,
MDBA_SET_ENTRY,
+ MDBA_SET_ENTRY_ATTRS,
__MDBA_SET_ENTRY_MAX,
};
#define MDBA_SET_ENTRY_MAX (__MDBA_SET_ENTRY_MAX - 1)
+/* [MDBA_SET_ENTRY_ATTRS] = {
+ * [MDBE_ATTR_xxx]
+ * ...
+ * }
+ */
+enum {
+ MDBE_ATTR_UNSPEC,
+ __MDBE_ATTR_MAX,
+};
+#define MDBE_ATTR_MAX (__MDBE_ATTR_MAX - 1)
+
/* Embedded inside LINK_XSTATS_TYPE_BRIDGE */
enum {
BRIDGE_XSTATS_UNSPEC,
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index a1ff0a372185..907df6d695ec 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -670,9 +670,12 @@ static bool is_valid_mdb_entry(struct br_mdb_entry *entry,
return true;
}
+static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
+};
+
static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net_device **pdev, struct br_mdb_entry **pentry,
- struct netlink_ext_ack *extack)
+ struct nlattr **mdb_attrs, struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct br_mdb_entry *entry;
@@ -719,6 +722,17 @@ static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
return -EINVAL;
*pentry = entry;
+ if (tb[MDBA_SET_ENTRY_ATTRS]) {
+ err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX,
+ tb[MDBA_SET_ENTRY_ATTRS],
+ br_mdbe_attrs_pol, extack);
+ if (err)
+ return err;
+ } else {
+ memset(mdb_attrs, 0,
+ sizeof(struct nlattr *) * (MDBE_ATTR_MAX + 1));
+ }
+
return 0;
}
@@ -803,6 +817,7 @@ static int __br_mdb_add(struct net *net, struct net_bridge *br,
static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
+ struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
struct net *net = sock_net(skb->sk);
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p = NULL;
@@ -812,7 +827,7 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net_bridge *br;
int err;
- err = br_mdb_parse(skb, nlh, &dev, &entry, extack);
+ err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack);
if (err < 0)
return err;
@@ -921,6 +936,7 @@ static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
+ struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
struct net *net = sock_net(skb->sk);
struct net_bridge_vlan_group *vg;
struct net_bridge_port *p = NULL;
@@ -930,7 +946,7 @@ static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net_bridge *br;
int err;
- err = br_mdb_parse(skb, nlh, &dev, &entry, extack);
+ err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack);
if (err < 0)
return err;
--
2.25.4
