bridge: allow creating bridge devices with netlink
Add netlink device ops to allow creating bridge device via netlink.
This works in a manner similar to vlan, macvlan and bonding.
Example:
# ip link add link dev br0 type bridge
# ip link del dev br0
The change required rearranging initializtion code to deal with
being called by create link. Most of the initialization happens
in br_dev_setup, but allocation of stats is done in ndo_init callback
to deal with allocation failure. Sysfs setup has to wait until
after the network device kobject is registered.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br.c b/net/bridge/br.c
index 84bbb82..f20c4fd 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -104,3 +104,4 @@
module_exit(br_deinit)
MODULE_LICENSE("GPL");
MODULE_VERSION(BR_VERSION);
+MODULE_ALIAS_RTNL_LINK("bridge");
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 21e5901..45cfd54 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -74,6 +74,17 @@
return NETDEV_TX_OK;
}
+static int br_dev_init(struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+
+ br->stats = alloc_percpu(struct br_cpu_netstats);
+ if (!br->stats)
+ return -ENOMEM;
+
+ return 0;
+}
+
static int br_dev_open(struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
@@ -334,6 +345,7 @@
static const struct net_device_ops br_netdev_ops = {
.ndo_open = br_dev_open,
.ndo_stop = br_dev_stop,
+ .ndo_init = br_dev_init,
.ndo_start_xmit = br_dev_xmit,
.ndo_get_stats64 = br_get_stats64,
.ndo_set_mac_address = br_set_mac_address,
@@ -357,18 +369,47 @@
free_netdev(dev);
}
+static struct device_type br_type = {
+ .name = "bridge",
+};
+
void br_dev_setup(struct net_device *dev)
{
+ struct net_bridge *br = netdev_priv(dev);
+
random_ether_addr(dev->dev_addr);
ether_setup(dev);
dev->netdev_ops = &br_netdev_ops;
dev->destructor = br_dev_free;
SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
+ SET_NETDEV_DEVTYPE(dev, &br_type);
dev->tx_queue_len = 0;
dev->priv_flags = IFF_EBRIDGE;
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
NETIF_F_NETNS_LOCAL | NETIF_F_GSO | NETIF_F_HW_VLAN_TX;
+
+ br->dev = dev;
+ spin_lock_init(&br->lock);
+ INIT_LIST_HEAD(&br->port_list);
+ spin_lock_init(&br->hash_lock);
+
+ br->bridge_id.prio[0] = 0x80;
+ br->bridge_id.prio[1] = 0x00;
+
+ memcpy(br->group_addr, br_group_address, ETH_ALEN);
+
+ br->feature_mask = dev->features;
+ br->stp_enabled = BR_NO_STP;
+ br->designated_root = br->bridge_id;
+ br->bridge_max_age = br->max_age = 20 * HZ;
+ br->bridge_hello_time = br->hello_time = 2 * HZ;
+ br->bridge_forward_delay = br->forward_delay = 15 * HZ;
+ br->ageing_time = 300 * HZ;
+
+ br_netfilter_rtable_init(br);
+ br_stp_timer_init(br);
+ br_multicast_init(br);
}
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 718b603..7f5379c 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -175,56 +175,6 @@
unregister_netdevice_queue(br->dev, head);
}
-static struct net_device *new_bridge_dev(struct net *net, const char *name)
-{
- struct net_bridge *br;
- struct net_device *dev;
-
- dev = alloc_netdev(sizeof(struct net_bridge), name,
- br_dev_setup);
-
- if (!dev)
- return NULL;
- dev_net_set(dev, net);
-
- br = netdev_priv(dev);
- br->dev = dev;
-
- br->stats = alloc_percpu(struct br_cpu_netstats);
- if (!br->stats) {
- free_netdev(dev);
- return NULL;
- }
-
- spin_lock_init(&br->lock);
- INIT_LIST_HEAD(&br->port_list);
- spin_lock_init(&br->hash_lock);
-
- br->bridge_id.prio[0] = 0x80;
- br->bridge_id.prio[1] = 0x00;
-
- memcpy(br->group_addr, br_group_address, ETH_ALEN);
-
- br->feature_mask = dev->features;
- br->stp_enabled = BR_NO_STP;
- br->designated_root = br->bridge_id;
- br->root_path_cost = 0;
- br->root_port = 0;
- br->bridge_max_age = br->max_age = 20 * HZ;
- br->bridge_hello_time = br->hello_time = 2 * HZ;
- br->bridge_forward_delay = br->forward_delay = 15 * HZ;
- br->topology_change = 0;
- br->topology_change_detected = 0;
- br->ageing_time = 300 * HZ;
-
- br_netfilter_rtable_init(br);
-
- br_stp_timer_init(br);
- br_multicast_init(br);
-
- return dev;
-}
-
/* find an available port number */
static int find_portno(struct net_bridge *br)
{
@@ -277,42 +227,19 @@
return p;
}
-static struct device_type br_type = {
- .name = "bridge",
-};
-
int br_add_bridge(struct net *net, const char *name)
{
struct net_device *dev;
- int ret;
- dev = new_bridge_dev(net, name);
+ dev = alloc_netdev(sizeof(struct net_bridge), name,
+ br_dev_setup);
+
if (!dev)
return -ENOMEM;
- rtnl_lock();
- if (strchr(dev->name, '%')) {
- ret = dev_alloc_name(dev, dev->name);
- if (ret < 0)
- goto out_free;
- }
+ dev_net_set(dev, net);
- SET_NETDEV_DEVTYPE(dev, &br_type);
-
- ret = register_netdevice(dev);
- if (ret)
- goto out_free;
-
- ret = br_sysfs_addbr(dev);
- if (ret)
- unregister_netdevice(dev);
- out:
- rtnl_unlock();
- return ret;
-
-out_free:
- free_netdev(dev);
- goto out;
+ return register_netdev(dev);
}
int br_del_bridge(struct net *net, const char *name)
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index fb7d5a7..134a2ff 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -12,9 +12,11 @@
#include <linux/kernel.h>
#include <linux/slab.h>
+#include <linux/etherdevice.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
+
#include "br_private.h"
static inline size_t br_nlmsg_size(void)
@@ -188,24 +190,61 @@
return 0;
}
-
-int __init br_netlink_init(void)
+static int br_validate(struct nlattr *tb[], struct nlattr *data[])
{
- if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo))
- return -ENOBUFS;
-
- /* Only the first call to __rtnl_register can fail */
- __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
-
- __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);
- __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);
- __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);
+ if (tb[IFLA_ADDRESS]) {
+ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+ return -EINVAL;
+ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+ return -EADDRNOTAVAIL;
+ }
return 0;
}
-void __exit br_netlink_fini(void)
+static struct rtnl_link_ops br_link_ops __read_mostly = {
+ .kind = "bridge",
+ .priv_size = sizeof(struct net_bridge),
+ .setup = br_dev_setup,
+ .validate = br_validate,
+};
+
+int __init br_netlink_init(void)
{
+ int err;
+
+ err = rtnl_link_register(&br_link_ops);
+ if (err < 0)
+ goto err1;
+
+ err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo);
+ if (err)
+ goto err2;
+ err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
+ if (err)
+ goto err3;
+ err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);
+ if (err)
+ goto err3;
+ err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);
+ if (err)
+ goto err3;
+ err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);
+ if (err)
+ goto err3;
+
+ return 0;
+
+err3:
rtnl_unregister_all(PF_BRIDGE);
+err2:
+ rtnl_link_unregister(&br_link_ops);
+err1:
+ return err;
}
+void __exit br_netlink_fini(void)
+{
+ rtnl_link_unregister(&br_link_ops);
+ rtnl_unregister_all(PF_BRIDGE);
+}
diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index 7d337c9..7a03bb9 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -36,6 +36,12 @@
struct net_bridge *br;
int err;
+ /* register of bridge completed, add sysfs entries */
+ if ((dev->priv_flags && IFF_EBRIDGE) && event == NETDEV_REGISTER) {
+ br_sysfs_addbr(dev);
+ return NOTIFY_DONE;
+ }
+
/* not a port of a bridge */
p = br_port_get_rtnl(dev);
if (!p)