![Toshiaki Makita](/assets/img/avatar_default.png)
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>
392 lines
9 KiB
C
392 lines
9 KiB
C
/*
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* Device handling code
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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/netpoll.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/list.h>
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#include <linux/netfilter_bridge.h>
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#include <asm/uaccess.h>
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#include "br_private.h"
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#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
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NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
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/* net device transmit always called with BH disabled */
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netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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const unsigned char *dest = skb->data;
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struct net_bridge_fdb_entry *dst;
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struct net_bridge_mdb_entry *mdst;
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struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
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u16 vid = 0;
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rcu_read_lock();
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#ifdef CONFIG_BRIDGE_NETFILTER
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if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
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br_nf_pre_routing_finish_bridge_slow(skb);
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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#endif
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u64_stats_update_begin(&brstats->syncp);
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brstats->tx_packets++;
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brstats->tx_bytes += skb->len;
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u64_stats_update_end(&brstats->syncp);
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if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
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goto out;
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BR_INPUT_SKB_CB(skb)->brdev = dev;
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skb_reset_mac_header(skb);
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skb_pull(skb, ETH_HLEN);
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if (is_broadcast_ether_addr(dest))
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br_flood_deliver(br, skb, false);
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else if (is_multicast_ether_addr(dest)) {
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if (unlikely(netpoll_tx_running(dev))) {
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br_flood_deliver(br, skb, false);
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goto out;
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}
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if (br_multicast_rcv(br, NULL, skb, vid)) {
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kfree_skb(skb);
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goto out;
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}
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mdst = br_mdb_get(br, skb, vid);
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if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
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br_multicast_querier_exists(br, eth_hdr(skb)))
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br_multicast_deliver(mdst, skb);
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else
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br_flood_deliver(br, skb, false);
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} else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
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br_deliver(dst->dst, skb);
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else
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br_flood_deliver(br, skb, true);
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out:
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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static int br_dev_init(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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int i;
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br->stats = alloc_percpu(struct pcpu_sw_netstats);
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if (!br->stats)
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return -ENOMEM;
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for_each_possible_cpu(i) {
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struct pcpu_sw_netstats *br_dev_stats;
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br_dev_stats = per_cpu_ptr(br->stats, i);
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u64_stats_init(&br_dev_stats->syncp);
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}
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return 0;
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}
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static int br_dev_open(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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netdev_update_features(dev);
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netif_start_queue(dev);
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br_stp_enable_bridge(br);
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br_multicast_open(br);
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return 0;
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}
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static void br_dev_set_multicast_list(struct net_device *dev)
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{
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}
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static int br_dev_stop(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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br_stp_disable_bridge(br);
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br_multicast_stop(br);
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netif_stop_queue(dev);
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return 0;
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}
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static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct pcpu_sw_netstats tmp, sum = { 0 };
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unsigned int cpu;
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for_each_possible_cpu(cpu) {
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unsigned int start;
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const struct pcpu_sw_netstats *bstats
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= per_cpu_ptr(br->stats, cpu);
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do {
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start = u64_stats_fetch_begin_bh(&bstats->syncp);
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memcpy(&tmp, bstats, sizeof(tmp));
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} while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
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sum.tx_bytes += tmp.tx_bytes;
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sum.tx_packets += tmp.tx_packets;
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sum.rx_bytes += tmp.rx_bytes;
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sum.rx_packets += tmp.rx_packets;
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}
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stats->tx_bytes = sum.tx_bytes;
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stats->tx_packets = sum.tx_packets;
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stats->rx_bytes = sum.rx_bytes;
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stats->rx_packets = sum.rx_packets;
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return stats;
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}
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static int br_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct net_bridge *br = netdev_priv(dev);
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if (new_mtu < 68 || new_mtu > br_min_mtu(br))
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return -EINVAL;
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dev->mtu = new_mtu;
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#ifdef CONFIG_BRIDGE_NETFILTER
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/* remember the MTU in the rtable for PMTU */
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dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
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#endif
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return 0;
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}
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/* Allow setting mac address to any valid ethernet address. */
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static int br_set_mac_address(struct net_device *dev, void *p)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct sockaddr *addr = p;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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spin_lock_bh(&br->lock);
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if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
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/* Mac address will be changed in br_stp_change_bridge_id(). */
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br_stp_change_bridge_id(br, addr->sa_data);
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}
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spin_unlock_bh(&br->lock);
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return 0;
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}
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static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, "bridge", sizeof(info->driver));
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strlcpy(info->version, BR_VERSION, sizeof(info->version));
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strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
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strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
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}
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static netdev_features_t br_fix_features(struct net_device *dev,
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netdev_features_t features)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_features_recompute(br, features);
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void br_poll_controller(struct net_device *br_dev)
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{
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}
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static void br_netpoll_cleanup(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list)
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br_netpoll_disable(p);
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}
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static int __br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
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{
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struct netpoll *np;
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int err;
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np = kzalloc(sizeof(*p->np), gfp);
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if (!np)
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return -ENOMEM;
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err = __netpoll_setup(np, p->dev, gfp);
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if (err) {
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kfree(np);
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return err;
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}
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p->np = np;
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return err;
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}
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int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
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{
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if (!p->br->dev->npinfo)
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return 0;
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return __br_netpoll_enable(p, gfp);
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}
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static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
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gfp_t gfp)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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int err = 0;
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list_for_each_entry(p, &br->port_list, list) {
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if (!p->dev)
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continue;
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err = __br_netpoll_enable(p, gfp);
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if (err)
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goto fail;
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}
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out:
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return err;
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fail:
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br_netpoll_cleanup(dev);
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goto out;
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}
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void br_netpoll_disable(struct net_bridge_port *p)
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{
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struct netpoll *np = p->np;
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if (!np)
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return;
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p->np = NULL;
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__netpoll_free_async(np);
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}
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#endif
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static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_add_if(br, slave_dev);
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}
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static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_del_if(br, slave_dev);
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}
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static const struct ethtool_ops br_ethtool_ops = {
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.get_drvinfo = br_getinfo,
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.get_link = ethtool_op_get_link,
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};
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static const struct net_device_ops br_netdev_ops = {
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.ndo_open = br_dev_open,
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.ndo_stop = br_dev_stop,
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.ndo_init = br_dev_init,
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.ndo_start_xmit = br_dev_xmit,
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.ndo_get_stats64 = br_get_stats64,
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.ndo_set_mac_address = br_set_mac_address,
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.ndo_set_rx_mode = br_dev_set_multicast_list,
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.ndo_change_mtu = br_change_mtu,
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.ndo_do_ioctl = br_dev_ioctl,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_netpoll_setup = br_netpoll_setup,
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.ndo_netpoll_cleanup = br_netpoll_cleanup,
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.ndo_poll_controller = br_poll_controller,
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#endif
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.ndo_add_slave = br_add_slave,
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.ndo_del_slave = br_del_slave,
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.ndo_fix_features = br_fix_features,
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.ndo_fdb_add = br_fdb_add,
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.ndo_fdb_del = br_fdb_delete,
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.ndo_fdb_dump = br_fdb_dump,
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.ndo_bridge_getlink = br_getlink,
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.ndo_bridge_setlink = br_setlink,
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.ndo_bridge_dellink = br_dellink,
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};
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static void br_dev_free(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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free_percpu(br->stats);
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free_netdev(dev);
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}
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static struct device_type br_type = {
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.name = "bridge",
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};
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void br_dev_setup(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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eth_hw_addr_random(dev);
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ether_setup(dev);
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dev->netdev_ops = &br_netdev_ops;
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dev->destructor = br_dev_free;
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SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
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SET_NETDEV_DEVTYPE(dev, &br_type);
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dev->tx_queue_len = 0;
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dev->priv_flags = IFF_EBRIDGE;
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dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
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NETIF_F_HW_VLAN_CTAG_TX;
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dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
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dev->vlan_features = COMMON_FEATURES;
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br->dev = dev;
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spin_lock_init(&br->lock);
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INIT_LIST_HEAD(&br->port_list);
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spin_lock_init(&br->hash_lock);
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br->bridge_id.prio[0] = 0x80;
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br->bridge_id.prio[1] = 0x00;
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memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
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br->stp_enabled = BR_NO_STP;
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br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
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br->designated_root = br->bridge_id;
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br->bridge_max_age = br->max_age = 20 * HZ;
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br->bridge_hello_time = br->hello_time = 2 * HZ;
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br->bridge_forward_delay = br->forward_delay = 15 * HZ;
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br->ageing_time = 300 * HZ;
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br_netfilter_rtable_init(br);
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br_stp_timer_init(br);
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br_multicast_init(br);
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}
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