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Subject[PATCH 1/2] Add a 'bridging_masters' file in sysfs under class/net
Date
To use this file:
echo "+<bridge device name>" > bridging_masters
to add a new bridge, and:
echo "-<bridge device name>" > bridging masters
to remove a device. Reading the file lists the current bridge devices.

Signed-off-by: Bill Nottingham <notting@redhat.com>
---
net/bridge/br.c | 2 +
net/bridge/br_private.h | 4 ++
net/bridge/br_sysfs_br.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 77 insertions(+), 0 deletions(-)

diff --git a/net/bridge/br.c b/net/bridge/br.c
index 573acdf..89c6c7c 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -59,6 +59,7 @@ static int __init br_init(void)

br_fdb_get_hook = br_fdb_get;
br_fdb_put_hook = br_fdb_put;
+ br_create_sysfs();

return 0;
err_out3:
@@ -83,6 +84,7 @@ static void __exit br_deinit(void)
br_cleanup_bridges();

synchronize_net();
+ br_destroy_sysfs();

br_netfilter_fini();
br_fdb_get_hook = NULL;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 815ed38..d5ff1c6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -249,6 +249,8 @@ extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
#ifdef CONFIG_SYSFS
/* br_sysfs_if.c */
extern struct sysfs_ops brport_sysfs_ops;
+extern int br_create_sysfs(void);
+extern void br_destroy_sysfs(void);
extern int br_sysfs_addif(struct net_bridge_port *p);

/* br_sysfs_br.c */
@@ -257,6 +259,8 @@ extern void br_sysfs_delbr(struct net_device *dev);

#else

+#define br_create_sysfs() (0)
+#define br_destroy_sysfs() (0)
#define br_sysfs_addif(p) (0)
#define br_sysfs_addbr(dev) (0)
#define br_sysfs_delbr(dev) do { } while(0)
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 27d6a51..a5d5fef 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -24,6 +24,77 @@
#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_bridge(cd) ((struct net_bridge *)(to_net_dev(cd)->priv))

+static ssize_t show_bridges(struct class *cls, char *buf)
+{
+ int res = 0;
+ struct net_device *dev, *next;
+
+ rtnl_lock();
+ for_each_netdev_safe(&init_net, dev, next) {
+ if (dev->priv_flags & IFF_EBRIDGE) {
+ if (res > (PAGE_SIZE - IFNAMSIZ)) {
+ if ((PAGE_SIZE - res) > 10)
+ res = PAGE_SIZE - 10;
+ res += sprintf(buf + res, "++more++ ");
+ break;
+ }
+ res += sprintf(buf + res, "%s ", dev->name);
+ }
+ }
+ if (res)
+ buf[res-1] = '\n';
+ rtnl_unlock();
+ return res;
+}
+
+static ssize_t store_bridges(struct class *cls, const char *buffer, size_t len)
+{
+ char command[IFNAMSIZ + 1] = {0, };
+ char *ifname;
+ int res = 0;
+
+ sscanf(buffer, "%16s", command); /* IFNAMSIZ */
+ ifname = command + 1;
+ if ((strlen(command) <= 1) || !dev_valid_name(ifname))
+ goto err_no_cmd;
+
+ if (command[0] == '+') {
+ res = br_add_bridge(ifname);
+ goto out;
+ }
+ if (command[0] == '-') {
+ res = br_del_bridge(ifname);
+ goto out;
+ }
+err_no_cmd:
+ printk(KERN_ERR "bridge: no command found in bridging_masters. Use +ifname or -ifname.\n");
+ res = -EPERM;
+out:
+ return res ? res : len;
+}
+
+static CLASS_ATTR(bridging_masters, S_IWUSR | S_IRUGO, show_bridges, store_bridges);
+
+static struct class *netdev_class;
+
+int br_create_sysfs(void)
+{
+ int ret;
+
+ netdev_class = (&init_net)->loopback_dev->dev.class;
+ if (!netdev_class)
+ return -ENODEV;
+
+ ret = class_create_file(netdev_class, &class_attr_bridging_masters);
+ return ret;
+}
+
+void br_destroy_sysfs(void)
+{
+ if (netdev_class)
+ class_remove_file(netdev_class, &class_attr_bridging_masters);
+}
+
/*
* Common code for storing bridge parameters.
*/
--
1.5.5.1


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