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https://github.com/edk2-porting/linux-next.git
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a4b816d8ba
Vlan code may need fdb change when changing mac address of bridge device even if it is caused by the mac address changing of a bridge port. Example configuration: ip link set eth0 address 12:34:56:78:90:ab ip link set eth1 address aa:bb:cc:dd:ee:ff brctl addif br0 eth0 brctl addif br0 eth1 # br0 will have mac address 12:34:56:78:90:ab bridge vlan add dev br0 vid 10 self bridge vlan add dev eth0 vid 10 We will have fdb entry such that f->dst == NULL, f->vlan_id == 10 and f->addr == 12:34:56:78:90:ab at this time. Next, change the mac address of eth0 to greater value. ip link set eth0 address ee:ff:12:34:56:78 Then, mac address of br0 will be recalculated and set to aa:bb:cc:dd:ee:ff. However, an entry aa:bb:cc:dd:ee:ff will not be created and we will be not able to communicate using br0 on vlan 10. Address this issue by deleting and adding local entries whenever changing the mac address of the bridge device. If there already exists an entry that has the same address, for example, in case that br_fdb_changeaddr() has already inserted it, br_fdb_change_mac_address() will simply fail to insert it and no duplicated entry will be made, as it was. This approach also needs br_add_if() to call br_fdb_insert() before br_stp_recalculate_bridge_id() so that we don't create an entry whose dst == NULL in this function to preserve previous behavior. Note that this is a slight change in behavior where the bridge device can receive the traffic to the new address before calling br_stp_recalculate_bridge_id() in br_add_if(). However, it is not a problem because we have already the address on the new port and such a way to insert new one before recalculating bridge id is taken in br_device_event() as well. Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Acked-by: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
458 lines
9.5 KiB
C
458 lines
9.5 KiB
C
/*
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* Userspace interface
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/netpoll.h>
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#include <linux/ethtool.h>
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#include <linux/if_arp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_ether.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <linux/if_vlan.h>
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#include "br_private.h"
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/*
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* Determine initial path cost based on speed.
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* using recommendations from 802.1d standard
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*
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* Since driver might sleep need to not be holding any locks.
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*/
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static int port_cost(struct net_device *dev)
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{
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struct ethtool_cmd ecmd;
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if (!__ethtool_get_settings(dev, &ecmd)) {
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switch (ethtool_cmd_speed(&ecmd)) {
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case SPEED_10000:
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return 2;
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case SPEED_1000:
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return 4;
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case SPEED_100:
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return 19;
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case SPEED_10:
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return 100;
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}
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}
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/* Old silly heuristics based on name */
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if (!strncmp(dev->name, "lec", 3))
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return 7;
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if (!strncmp(dev->name, "plip", 4))
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return 2500;
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return 100; /* assume old 10Mbps */
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}
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/* Check for port carrier transitions. */
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void br_port_carrier_check(struct net_bridge_port *p)
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{
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struct net_device *dev = p->dev;
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struct net_bridge *br = p->br;
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if (!(p->flags & BR_ADMIN_COST) &&
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netif_running(dev) && netif_oper_up(dev))
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p->path_cost = port_cost(dev);
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if (!netif_running(br->dev))
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return;
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spin_lock_bh(&br->lock);
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if (netif_running(dev) && netif_oper_up(dev)) {
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if (p->state == BR_STATE_DISABLED)
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br_stp_enable_port(p);
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} else {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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}
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spin_unlock_bh(&br->lock);
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}
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static void release_nbp(struct kobject *kobj)
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{
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struct net_bridge_port *p
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= container_of(kobj, struct net_bridge_port, kobj);
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kfree(p);
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}
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static struct kobj_type brport_ktype = {
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#ifdef CONFIG_SYSFS
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.sysfs_ops = &brport_sysfs_ops,
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#endif
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.release = release_nbp,
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};
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static void destroy_nbp(struct net_bridge_port *p)
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{
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struct net_device *dev = p->dev;
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p->br = NULL;
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p->dev = NULL;
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dev_put(dev);
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kobject_put(&p->kobj);
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}
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static void destroy_nbp_rcu(struct rcu_head *head)
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{
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struct net_bridge_port *p =
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container_of(head, struct net_bridge_port, rcu);
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destroy_nbp(p);
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}
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/* Delete port(interface) from bridge is done in two steps.
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* via RCU. First step, marks device as down. That deletes
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* all the timers and stops new packets from flowing through.
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*
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* Final cleanup doesn't occur until after all CPU's finished
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* processing packets.
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*
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* Protected from multiple admin operations by RTNL mutex
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*/
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static void del_nbp(struct net_bridge_port *p)
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{
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struct net_bridge *br = p->br;
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struct net_device *dev = p->dev;
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sysfs_remove_link(br->ifobj, p->dev->name);
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dev_set_promiscuity(dev, -1);
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spin_lock_bh(&br->lock);
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br_stp_disable_port(p);
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spin_unlock_bh(&br->lock);
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br_ifinfo_notify(RTM_DELLINK, p);
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nbp_vlan_flush(p);
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br_fdb_delete_by_port(br, p, 1);
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list_del_rcu(&p->list);
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dev->priv_flags &= ~IFF_BRIDGE_PORT;
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netdev_rx_handler_unregister(dev);
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netdev_upper_dev_unlink(dev, br->dev);
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br_multicast_del_port(p);
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kobject_uevent(&p->kobj, KOBJ_REMOVE);
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kobject_del(&p->kobj);
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br_netpoll_disable(p);
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call_rcu(&p->rcu, destroy_nbp_rcu);
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}
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/* Delete bridge device */
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void br_dev_delete(struct net_device *dev, struct list_head *head)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p, *n;
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list_for_each_entry_safe(p, n, &br->port_list, list) {
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del_nbp(p);
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}
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br_fdb_delete_by_port(br, NULL, 1);
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br_vlan_flush(br);
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del_timer_sync(&br->gc_timer);
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br_sysfs_delbr(br->dev);
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unregister_netdevice_queue(br->dev, head);
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}
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/* find an available port number */
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static int find_portno(struct net_bridge *br)
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{
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int index;
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struct net_bridge_port *p;
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unsigned long *inuse;
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inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
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GFP_KERNEL);
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if (!inuse)
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return -ENOMEM;
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set_bit(0, inuse); /* zero is reserved */
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list_for_each_entry(p, &br->port_list, list) {
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set_bit(p->port_no, inuse);
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}
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index = find_first_zero_bit(inuse, BR_MAX_PORTS);
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kfree(inuse);
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return (index >= BR_MAX_PORTS) ? -EXFULL : index;
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}
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/* called with RTNL but without bridge lock */
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static struct net_bridge_port *new_nbp(struct net_bridge *br,
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struct net_device *dev)
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{
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int index;
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struct net_bridge_port *p;
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index = find_portno(br);
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if (index < 0)
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return ERR_PTR(index);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return ERR_PTR(-ENOMEM);
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p->br = br;
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dev_hold(dev);
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p->dev = dev;
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p->path_cost = port_cost(dev);
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p->priority = 0x8000 >> BR_PORT_BITS;
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p->port_no = index;
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p->flags = BR_LEARNING | BR_FLOOD;
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br_init_port(p);
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p->state = BR_STATE_DISABLED;
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br_stp_port_timer_init(p);
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br_multicast_add_port(p);
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return p;
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}
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int br_add_bridge(struct net *net, const char *name)
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{
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struct net_device *dev;
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int res;
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dev = alloc_netdev(sizeof(struct net_bridge), name,
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br_dev_setup);
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if (!dev)
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return -ENOMEM;
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dev_net_set(dev, net);
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dev->rtnl_link_ops = &br_link_ops;
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res = register_netdev(dev);
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if (res)
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free_netdev(dev);
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return res;
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}
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int br_del_bridge(struct net *net, const char *name)
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{
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struct net_device *dev;
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int ret = 0;
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rtnl_lock();
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dev = __dev_get_by_name(net, name);
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if (dev == NULL)
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ret = -ENXIO; /* Could not find device */
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else if (!(dev->priv_flags & IFF_EBRIDGE)) {
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/* Attempt to delete non bridge device! */
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ret = -EPERM;
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}
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else if (dev->flags & IFF_UP) {
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/* Not shutdown yet. */
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ret = -EBUSY;
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}
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else
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br_dev_delete(dev, NULL);
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rtnl_unlock();
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return ret;
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}
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/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
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int br_min_mtu(const struct net_bridge *br)
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{
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const struct net_bridge_port *p;
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int mtu = 0;
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ASSERT_RTNL();
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if (list_empty(&br->port_list))
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mtu = ETH_DATA_LEN;
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else {
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list_for_each_entry(p, &br->port_list, list) {
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if (!mtu || p->dev->mtu < mtu)
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mtu = p->dev->mtu;
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}
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}
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return mtu;
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}
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/*
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* Recomputes features using slave's features
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*/
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netdev_features_t br_features_recompute(struct net_bridge *br,
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netdev_features_t features)
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{
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struct net_bridge_port *p;
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netdev_features_t mask;
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if (list_empty(&br->port_list))
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return features;
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mask = features;
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features &= ~NETIF_F_ONE_FOR_ALL;
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list_for_each_entry(p, &br->port_list, list) {
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features = netdev_increment_features(features,
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p->dev->features, mask);
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}
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return features;
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}
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/* called with RTNL */
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int br_add_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p;
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int err = 0;
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bool changed_addr;
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/* Don't allow bridging non-ethernet like devices */
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if ((dev->flags & IFF_LOOPBACK) ||
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dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN ||
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!is_valid_ether_addr(dev->dev_addr))
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return -EINVAL;
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/* No bridging of bridges */
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if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
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return -ELOOP;
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/* Device is already being bridged */
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if (br_port_exists(dev))
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return -EBUSY;
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/* No bridging devices that dislike that (e.g. wireless) */
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if (dev->priv_flags & IFF_DONT_BRIDGE)
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return -EOPNOTSUPP;
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p = new_nbp(br, dev);
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if (IS_ERR(p))
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return PTR_ERR(p);
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call_netdevice_notifiers(NETDEV_JOIN, dev);
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err = dev_set_promiscuity(dev, 1);
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if (err)
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goto put_back;
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err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
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SYSFS_BRIDGE_PORT_ATTR);
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if (err)
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goto err1;
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err = br_sysfs_addif(p);
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if (err)
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goto err2;
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err = br_netpoll_enable(p, GFP_KERNEL);
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if (err)
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goto err3;
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err = netdev_master_upper_dev_link(dev, br->dev);
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if (err)
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goto err4;
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err = netdev_rx_handler_register(dev, br_handle_frame, p);
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if (err)
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goto err5;
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dev->priv_flags |= IFF_BRIDGE_PORT;
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dev_disable_lro(dev);
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list_add_rcu(&p->list, &br->port_list);
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netdev_update_features(br->dev);
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if (br->dev->needed_headroom < dev->needed_headroom)
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br->dev->needed_headroom = dev->needed_headroom;
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if (br_fdb_insert(br, p, dev->dev_addr, 0))
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netdev_err(dev, "failed insert local address bridge forwarding table\n");
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spin_lock_bh(&br->lock);
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changed_addr = br_stp_recalculate_bridge_id(br);
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if (netif_running(dev) && netif_oper_up(dev) &&
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(br->dev->flags & IFF_UP))
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br_stp_enable_port(p);
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spin_unlock_bh(&br->lock);
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br_ifinfo_notify(RTM_NEWLINK, p);
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if (changed_addr)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
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dev_set_mtu(br->dev, br_min_mtu(br));
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kobject_uevent(&p->kobj, KOBJ_ADD);
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return 0;
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err5:
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netdev_upper_dev_unlink(dev, br->dev);
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err4:
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br_netpoll_disable(p);
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err3:
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sysfs_remove_link(br->ifobj, p->dev->name);
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err2:
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kobject_put(&p->kobj);
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p = NULL; /* kobject_put frees */
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err1:
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dev_set_promiscuity(dev, -1);
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put_back:
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dev_put(dev);
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kfree(p);
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return err;
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}
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/* called with RTNL */
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int br_del_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p;
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bool changed_addr;
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p = br_port_get_rtnl(dev);
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if (!p || p->br != br)
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return -EINVAL;
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/* Since more than one interface can be attached to a bridge,
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* there still maybe an alternate path for netconsole to use;
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* therefore there is no reason for a NETDEV_RELEASE event.
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*/
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del_nbp(p);
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spin_lock_bh(&br->lock);
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changed_addr = br_stp_recalculate_bridge_id(br);
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spin_unlock_bh(&br->lock);
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if (changed_addr)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
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netdev_update_features(br->dev);
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return 0;
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}
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