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-rw-r--r--net/bridge/br.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/net/bridge/br.c b/net/bridge/br.c
new file mode 100644
index 000000000..b0a0b82e2
--- /dev/null
+++ b/net/bridge/br.c
@@ -0,0 +1,288 @@
+/*
+ * Generic parts
+ * Linux ethernet bridge
+ *
+ * Authors:
+ * Lennert Buytenhek <buytenh@gnu.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/llc.h>
+#include <net/llc.h>
+#include <net/stp.h>
+#include <net/switchdev.h>
+
+#include "br_private.h"
+
+/*
+ * Handle changes in state of network devices enslaved to a bridge.
+ *
+ * Note: don't care about up/down if bridge itself is down, because
+ * port state is checked when bridge is brought up.
+ */
+static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net_bridge_port *p;
+ struct net_bridge *br;
+ bool notified = false;
+ bool changed_addr;
+ 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)
+ return NOTIFY_DONE;
+
+ br = p->br;
+
+ switch (event) {
+ case NETDEV_CHANGEMTU:
+ br_mtu_auto_adjust(br);
+ break;
+
+ case NETDEV_CHANGEADDR:
+ spin_lock_bh(&br->lock);
+ br_fdb_changeaddr(p, dev->dev_addr);
+ changed_addr = br_stp_recalculate_bridge_id(br);
+ spin_unlock_bh(&br->lock);
+
+ if (changed_addr)
+ call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
+
+ break;
+
+ case NETDEV_CHANGE:
+ br_port_carrier_check(p, &notified);
+ break;
+
+ case NETDEV_FEAT_CHANGE:
+ netdev_update_features(br->dev);
+ break;
+
+ case NETDEV_DOWN:
+ spin_lock_bh(&br->lock);
+ if (br->dev->flags & IFF_UP) {
+ br_stp_disable_port(p);
+ notified = true;
+ }
+ spin_unlock_bh(&br->lock);
+ break;
+
+ case NETDEV_UP:
+ if (netif_running(br->dev) && netif_oper_up(dev)) {
+ spin_lock_bh(&br->lock);
+ br_stp_enable_port(p);
+ notified = true;
+ spin_unlock_bh(&br->lock);
+ }
+ break;
+
+ case NETDEV_UNREGISTER:
+ br_del_if(br, dev);
+ break;
+
+ case NETDEV_CHANGENAME:
+ err = br_sysfs_renameif(p);
+ if (err)
+ return notifier_from_errno(err);
+ break;
+
+ case NETDEV_PRE_TYPE_CHANGE:
+ /* Forbid underlaying device to change its type. */
+ return NOTIFY_BAD;
+
+ case NETDEV_RESEND_IGMP:
+ /* Propagate to master device */
+ call_netdevice_notifiers(event, br->dev);
+ break;
+ }
+
+ /* Events that may cause spanning tree to refresh */
+ if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
+ event == NETDEV_CHANGE || event == NETDEV_DOWN))
+ br_ifinfo_notify(RTM_NEWLINK, NULL, p);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block br_device_notifier = {
+ .notifier_call = br_device_event
+};
+
+/* called with RTNL or RCU */
+static int br_switchdev_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+ struct net_bridge_port *p;
+ struct net_bridge *br;
+ struct switchdev_notifier_fdb_info *fdb_info;
+ int err = NOTIFY_DONE;
+
+ p = br_port_get_rtnl_rcu(dev);
+ if (!p)
+ goto out;
+
+ br = p->br;
+
+ switch (event) {
+ case SWITCHDEV_FDB_ADD_TO_BRIDGE:
+ fdb_info = ptr;
+ err = br_fdb_external_learn_add(br, p, fdb_info->addr,
+ fdb_info->vid, false);
+ if (err) {
+ err = notifier_from_errno(err);
+ break;
+ }
+ br_fdb_offloaded_set(br, p, fdb_info->addr,
+ fdb_info->vid);
+ break;
+ case SWITCHDEV_FDB_DEL_TO_BRIDGE:
+ fdb_info = ptr;
+ err = br_fdb_external_learn_del(br, p, fdb_info->addr,
+ fdb_info->vid, false);
+ if (err)
+ err = notifier_from_errno(err);
+ break;
+ case SWITCHDEV_FDB_OFFLOADED:
+ fdb_info = ptr;
+ br_fdb_offloaded_set(br, p, fdb_info->addr,
+ fdb_info->vid);
+ break;
+ }
+
+out:
+ return err;
+}
+
+static struct notifier_block br_switchdev_notifier = {
+ .notifier_call = br_switchdev_event,
+};
+
+static void __net_exit br_net_exit(struct net *net)
+{
+ struct net_device *dev;
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ for_each_netdev(net, dev)
+ if (dev->priv_flags & IFF_EBRIDGE)
+ br_dev_delete(dev, &list);
+
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+
+}
+
+static struct pernet_operations br_net_ops = {
+ .exit = br_net_exit,
+};
+
+static const struct stp_proto br_stp_proto = {
+ .rcv = br_stp_rcv,
+};
+
+static int __init br_init(void)
+{
+ int err;
+
+ BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
+
+ err = stp_proto_register(&br_stp_proto);
+ if (err < 0) {
+ pr_err("bridge: can't register sap for STP\n");
+ return err;
+ }
+
+ err = br_fdb_init();
+ if (err)
+ goto err_out;
+
+ err = register_pernet_subsys(&br_net_ops);
+ if (err)
+ goto err_out1;
+
+ err = br_nf_core_init();
+ if (err)
+ goto err_out2;
+
+ err = register_netdevice_notifier(&br_device_notifier);
+ if (err)
+ goto err_out3;
+
+ err = register_switchdev_notifier(&br_switchdev_notifier);
+ if (err)
+ goto err_out4;
+
+ err = br_netlink_init();
+ if (err)
+ goto err_out5;
+
+ brioctl_set(br_ioctl_deviceless_stub);
+
+#if IS_ENABLED(CONFIG_ATM_LANE)
+ br_fdb_test_addr_hook = br_fdb_test_addr;
+#endif
+
+#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
+ pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
+ "by default. Update your scripts to load br_netfilter if you "
+ "need this.\n");
+#endif
+
+ return 0;
+
+err_out5:
+ unregister_switchdev_notifier(&br_switchdev_notifier);
+err_out4:
+ unregister_netdevice_notifier(&br_device_notifier);
+err_out3:
+ br_nf_core_fini();
+err_out2:
+ unregister_pernet_subsys(&br_net_ops);
+err_out1:
+ br_fdb_fini();
+err_out:
+ stp_proto_unregister(&br_stp_proto);
+ return err;
+}
+
+static void __exit br_deinit(void)
+{
+ stp_proto_unregister(&br_stp_proto);
+ br_netlink_fini();
+ unregister_switchdev_notifier(&br_switchdev_notifier);
+ unregister_netdevice_notifier(&br_device_notifier);
+ brioctl_set(NULL);
+ unregister_pernet_subsys(&br_net_ops);
+
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
+
+ br_nf_core_fini();
+#if IS_ENABLED(CONFIG_ATM_LANE)
+ br_fdb_test_addr_hook = NULL;
+#endif
+ br_fdb_fini();
+}
+
+module_init(br_init)
+module_exit(br_deinit)
+MODULE_LICENSE("GPL");
+MODULE_VERSION(BR_VERSION);
+MODULE_ALIAS_RTNL_LINK("bridge");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 18:36:14 +0000