bridge: implement rtnl_link_ops->changelink

Allow rtnetlink users to set bridge master info via IFLA_INFO_DATA attr
This initial part implements forward_delay, hello_time, max_age options.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index bcac09fe2ac8afeff4788ba51c6f955a1dd7d255..7c97a261afae88a2c5ab85e73d69fb0a1f9fbb8b 100644 (file)
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -484,6 +484,42 @@ static size_t br_port_get_slave_size(const struct net_device *brdev,
        return br_port_info_size();
 }
 
+static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
+       [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
+       [IFLA_BR_HELLO_TIME]    = { .type = NLA_U32 },
+       [IFLA_BR_MAX_AGE]       = { .type = NLA_U32 },
+};
+
+static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
+                        struct nlattr *data[])
+{
+       struct net_bridge *br = netdev_priv(brdev);
+       int err;
+
+       if (!data)
+               return 0;
+
+       if (data[IFLA_BR_FORWARD_DELAY]) {
+               err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
+               if (err)
+                       return err;
+       }
+
+       if (data[IFLA_BR_HELLO_TIME]) {
+               err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
+               if (err)
+                       return err;
+       }
+
+       if (data[IFLA_BR_MAX_AGE]) {
+               err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
+               if (err)
+                       return err;
+       }
+
+       return 0;
+}
+
 static size_t br_get_size(const struct net_device *brdev)
 {
        return nla_total_size(sizeof(u32)) +    /* IFLA_BR_FORWARD_DELAY  */
@@ -534,8 +570,11 @@ struct rtnl_link_ops br_link_ops __read_mostly = {
        .kind                   = "bridge",
        .priv_size              = sizeof(struct net_bridge),
        .setup                  = br_dev_setup,
+       .maxtype                = IFLA_BRPORT_MAX,
+       .policy                 = br_policy,
        .validate               = br_validate,
        .newlink                = br_dev_newlink,
+       .changelink             = br_changelink,
        .dellink                = br_dev_delete,
        .get_size               = br_get_size,
        .fill_info              = br_fill_info,