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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 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;
if (netif_is_bridge_master(dev)) { struct net_bridge *br = netdev_priv(dev);
if (event == NETDEV_REGISTER) br_fdb_change_mac_address(br, dev->dev_addr);
err = br_vlan_bridge_event(dev, event, ptr); if (err) return notifier_from_errno(err);
if (event == NETDEV_REGISTER) { /* register of bridge completed, add sysfs entries */ err = br_sysfs_addbr(dev); if (err) return notifier_from_errno(err);
return NOTIFY_DONE; } }
if (is_vlan_dev(dev)) { struct net_device *real_dev = vlan_dev_real_dev(dev);
if (netif_is_bridge_master(real_dev)) br_vlan_vlan_upper_event(real_dev, dev, event); }
/* 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_PRE_CHANGEADDR: if (br->dev->addr_assign_type == NET_ADDR_SET) break; prechaddr_info = ptr; err = netif_pre_changeaddr_notify(br->dev, prechaddr_info->dev_addr, extack); if (err) return notifier_from_errno(err); 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, ¬ified); 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 underlying device to change its type. */ return NOTIFY_BAD;
case NETDEV_RESEND_IGMP: /* Propagate to master device */ call_netdevice_notifiers(event, br->dev); break; }
if (event != NETDEV_UNREGISTER) br_vlan_port_event(p, event);
/* 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, fdb_info->locked, false); if (err) { err = notifier_from_errno(err); break; } br_fdb_offloaded_set(br, p, fdb_info->addr, fdb_info->vid, fdb_info->offloaded); 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, fdb_info->offloaded); break; case SWITCHDEV_FDB_FLUSH_TO_BRIDGE: fdb_info = ptr; /* Don't delete static entries */ br_fdb_delete_by_port(br, p, fdb_info->vid, 0); break; }
out: return err;}
static struct notifier_block br_switchdev_notifier = { .notifier_call = br_switchdev_event,};
/* called under rtnl_mutex */static int br_switchdev_blocking_event(struct notifier_block *nb, unsigned long event, void *ptr){ struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); struct net_device *dev = switchdev_notifier_info_to_dev(ptr); struct switchdev_notifier_brport_info *brport_info; const struct switchdev_brport *b; struct net_bridge_port *p; int err = NOTIFY_DONE;
p = br_port_get_rtnl(dev); if (!p) goto out;
switch (event) { case SWITCHDEV_BRPORT_OFFLOADED: brport_info = ptr; b = &brport_info->brport;
err = br_switchdev_port_offload(p, b->dev, b->ctx, b->atomic_nb, b->blocking_nb, b->tx_fwd_offload, extack); err = notifier_from_errno(err); break; case SWITCHDEV_BRPORT_UNOFFLOADED: brport_info = ptr; b = &brport_info->brport;
br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb, b->blocking_nb); break; case SWITCHDEV_BRPORT_REPLAY: brport_info = ptr; b = &brport_info->brport;
err = br_switchdev_port_replay(p, b->dev, b->ctx, b->atomic_nb, b->blocking_nb, extack); err = notifier_from_errno(err); break; }
out: return err;}
static struct notifier_block br_switchdev_blocking_notifier = { .notifier_call = br_switchdev_blocking_event,};
static intbr_toggle_fdb_local_vlan_0(struct net_bridge *br, bool on, struct netlink_ext_ack *extack){ int err;
if (br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0) == on) return 0;
err = br_fdb_toggle_local_vlan_0(br, on, extack); if (err) return err;
br_opt_toggle(br, BROPT_FDB_LOCAL_VLAN_0, on); return 0;}
/* br_boolopt_toggle - change user-controlled boolean option * * @br: bridge device * @opt: id of the option to change * @on: new option value * @extack: extack for error messages * * Changes the value of the respective boolean option to @on taking care of * any internal option value mapping and configuration. */int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, struct netlink_ext_ack *extack){ int err = 0;
switch (opt) { case BR_BOOLOPT_NO_LL_LEARN: br_opt_toggle(br, BROPT_NO_LL_LEARN, on); break; case BR_BOOLOPT_MCAST_VLAN_SNOOPING: err = br_multicast_toggle_vlan_snooping(br, on, extack); break; case BR_BOOLOPT_MST_ENABLE: err = br_mst_set_enabled(br, on, extack); break; case BR_BOOLOPT_MDB_OFFLOAD_FAIL_NOTIFICATION: br_opt_toggle(br, BROPT_MDB_OFFLOAD_FAIL_NOTIFICATION, on); break; case BR_BOOLOPT_FDB_LOCAL_VLAN_0: err = br_toggle_fdb_local_vlan_0(br, on, extack); break; default: /* shouldn't be called with unsupported options */ WARN_ON(1); break; }
return err;}
int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt){ switch (opt) { case BR_BOOLOPT_NO_LL_LEARN: return br_opt_get(br, BROPT_NO_LL_LEARN); case BR_BOOLOPT_MCAST_VLAN_SNOOPING: return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED); case BR_BOOLOPT_MST_ENABLE: return br_opt_get(br, BROPT_MST_ENABLED); case BR_BOOLOPT_MDB_OFFLOAD_FAIL_NOTIFICATION: return br_opt_get(br, BROPT_MDB_OFFLOAD_FAIL_NOTIFICATION); case BR_BOOLOPT_FDB_LOCAL_VLAN_0: return br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0); default: /* shouldn't be called with unsupported options */ WARN_ON(1); break; }
return 0;}
int br_boolopt_multi_toggle(struct net_bridge *br, struct br_boolopt_multi *bm, struct netlink_ext_ack *extack){ unsigned long bitmap = bm->optmask; int err = 0; int opt_id;
opt_id = find_next_bit(&bitmap, BITS_PER_LONG, BR_BOOLOPT_MAX); if (opt_id != BITS_PER_LONG) { NL_SET_ERR_MSG_FMT_MOD(extack, "Unknown boolean option %d", opt_id); return -EINVAL; }
for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) { bool on = !!(bm->optval & BIT(opt_id));
err = br_boolopt_toggle(br, opt_id, on, extack); if (err) { br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n", opt_id, br_boolopt_get(br, opt_id), on, err); break; } }
return err;}
void br_boolopt_multi_get(const struct net_bridge *br, struct br_boolopt_multi *bm){ u32 optval = 0; int opt_id;
for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++) optval |= (br_boolopt_get(br, opt_id) << opt_id);
bm->optval = optval; bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);}
/* private bridge options, controlled by the kernel */void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on){ bool cur = !!br_opt_get(br, opt);
br_debug(br, "toggle option: %d state: %d -> %d\n", opt, cur, on);
if (cur == on) return;
if (on) set_bit(opt, &br->options); else clear_bit(opt, &br->options);}
static void __net_exit br_net_exit_rtnl(struct net *net, struct list_head *dev_to_kill){ struct net_device *dev;
ASSERT_RTNL_NET(net);
for_each_netdev(net, dev) if (netif_is_bridge_master(dev)) br_dev_delete(dev, dev_to_kill);}
static struct pernet_operations br_net_ops = { .exit_rtnl = br_net_exit_rtnl,};
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) > sizeof_field(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 = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier); if (err) goto err_out5;
err = br_netlink_init(); if (err) goto err_out6;
brioctl_set(br_ioctl_stub);
#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_out6: unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);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_blocking_notifier(&br_switchdev_blocking_notifier); 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(); br_fdb_fini();}
module_init(br_init)module_exit(br_deinit)MODULE_LICENSE("GPL");MODULE_VERSION(BR_VERSION);MODULE_ALIAS_RTNL_LINK("bridge");MODULE_DESCRIPTION("Ethernet bridge driver");MODULE_IMPORT_NS("NETDEV_INTERNAL");