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net: bridge: mdb: add support to extend add/del commands 

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@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-09-22 10:30:18 +03:00 committed by David S. Miller
parent eab3227b12
commit 9c4258c78a
2 changed files with 31 additions and 3 deletions
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12
include/uapi/linux/if_bridge.h
View File

@ -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,

22
net/bridge/br_mdb.c
View File

@ -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 @@ unlock:
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;