378 lines
8.5 KiB
C
378 lines
8.5 KiB
C
/*
|
|
* Device handling code
|
|
* 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/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/netpoll.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/ethtool.h>
|
|
#include <linux/list.h>
|
|
#include <linux/netfilter_bridge.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include "br_private.h"
|
|
|
|
/* net device transmit always called with BH disabled */
|
|
netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
const unsigned char *dest = skb->data;
|
|
struct net_bridge_fdb_entry *dst;
|
|
struct net_bridge_mdb_entry *mdst;
|
|
struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
|
|
|
|
#ifdef CONFIG_BRIDGE_NETFILTER
|
|
if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
|
|
br_nf_pre_routing_finish_bridge_slow(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
#endif
|
|
|
|
u64_stats_update_begin(&brstats->syncp);
|
|
brstats->tx_packets++;
|
|
brstats->tx_bytes += skb->len;
|
|
u64_stats_update_end(&brstats->syncp);
|
|
|
|
BR_INPUT_SKB_CB(skb)->brdev = dev;
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb_pull(skb, ETH_HLEN);
|
|
|
|
rcu_read_lock();
|
|
if (is_broadcast_ether_addr(dest))
|
|
br_flood_deliver(br, skb);
|
|
else if (is_multicast_ether_addr(dest)) {
|
|
if (unlikely(netpoll_tx_running(dev))) {
|
|
br_flood_deliver(br, skb);
|
|
goto out;
|
|
}
|
|
if (br_multicast_rcv(br, NULL, skb)) {
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
mdst = br_mdb_get(br, skb);
|
|
if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
|
|
br_multicast_deliver(mdst, skb);
|
|
else
|
|
br_flood_deliver(br, skb);
|
|
} else if ((dst = __br_fdb_get(br, dest)) != NULL)
|
|
br_deliver(dst->dst, skb);
|
|
else
|
|
br_flood_deliver(br, skb);
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int br_dev_init(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
br->stats = alloc_percpu(struct br_cpu_netstats);
|
|
if (!br->stats)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int br_dev_open(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
netdev_update_features(dev);
|
|
netif_start_queue(dev);
|
|
br_stp_enable_bridge(br);
|
|
br_multicast_open(br);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void br_dev_set_multicast_list(struct net_device *dev)
|
|
{
|
|
}
|
|
|
|
static int br_dev_stop(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
br_stp_disable_bridge(br);
|
|
br_multicast_stop(br);
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
|
|
struct rtnl_link_stats64 *stats)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct br_cpu_netstats tmp, sum = { 0 };
|
|
unsigned int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
unsigned int start;
|
|
const struct br_cpu_netstats *bstats
|
|
= per_cpu_ptr(br->stats, cpu);
|
|
do {
|
|
start = u64_stats_fetch_begin(&bstats->syncp);
|
|
memcpy(&tmp, bstats, sizeof(tmp));
|
|
} while (u64_stats_fetch_retry(&bstats->syncp, start));
|
|
sum.tx_bytes += tmp.tx_bytes;
|
|
sum.tx_packets += tmp.tx_packets;
|
|
sum.rx_bytes += tmp.rx_bytes;
|
|
sum.rx_packets += tmp.rx_packets;
|
|
}
|
|
|
|
stats->tx_bytes = sum.tx_bytes;
|
|
stats->tx_packets = sum.tx_packets;
|
|
stats->rx_bytes = sum.rx_bytes;
|
|
stats->rx_packets = sum.rx_packets;
|
|
|
|
return stats;
|
|
}
|
|
|
|
static int br_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
if (new_mtu < 68 || new_mtu > br_min_mtu(br))
|
|
return -EINVAL;
|
|
|
|
dev->mtu = new_mtu;
|
|
|
|
#ifdef CONFIG_BRIDGE_NETFILTER
|
|
/* remember the MTU in the rtable for PMTU */
|
|
dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Allow setting mac address to any valid ethernet address. */
|
|
static int br_set_mac_address(struct net_device *dev, void *p)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct sockaddr *addr = p;
|
|
|
|
if (!is_valid_ether_addr(addr->sa_data))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
spin_lock_bh(&br->lock);
|
|
if (compare_ether_addr(dev->dev_addr, addr->sa_data)) {
|
|
dev->addr_assign_type &= ~NET_ADDR_RANDOM;
|
|
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
|
|
br_fdb_change_mac_address(br, addr->sa_data);
|
|
br_stp_change_bridge_id(br, addr->sa_data);
|
|
}
|
|
br->flags |= BR_SET_MAC_ADDR;
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
|
{
|
|
strcpy(info->driver, "bridge");
|
|
strcpy(info->version, BR_VERSION);
|
|
strcpy(info->fw_version, "N/A");
|
|
strcpy(info->bus_info, "N/A");
|
|
}
|
|
|
|
static netdev_features_t br_fix_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
return br_features_recompute(br, features);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
static void br_poll_controller(struct net_device *br_dev)
|
|
{
|
|
}
|
|
|
|
static void br_netpoll_cleanup(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct net_bridge_port *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, &br->port_list, list) {
|
|
br_netpoll_disable(p);
|
|
}
|
|
}
|
|
|
|
static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
struct net_bridge_port *p, *n;
|
|
int err = 0;
|
|
|
|
list_for_each_entry_safe(p, n, &br->port_list, list) {
|
|
if (!p->dev)
|
|
continue;
|
|
|
|
err = br_netpoll_enable(p);
|
|
if (err)
|
|
goto fail;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
|
|
fail:
|
|
br_netpoll_cleanup(dev);
|
|
goto out;
|
|
}
|
|
|
|
int br_netpoll_enable(struct net_bridge_port *p)
|
|
{
|
|
struct netpoll *np;
|
|
int err = 0;
|
|
|
|
np = kzalloc(sizeof(*p->np), GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!np)
|
|
goto out;
|
|
|
|
np->dev = p->dev;
|
|
strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
|
|
|
|
err = __netpoll_setup(np);
|
|
if (err) {
|
|
kfree(np);
|
|
goto out;
|
|
}
|
|
|
|
p->np = np;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
void br_netpoll_disable(struct net_bridge_port *p)
|
|
{
|
|
struct netpoll *np = p->np;
|
|
|
|
if (!np)
|
|
return;
|
|
|
|
p->np = NULL;
|
|
|
|
/* Wait for transmitting packets to finish before freeing. */
|
|
synchronize_rcu_bh();
|
|
|
|
__netpoll_cleanup(np);
|
|
kfree(np);
|
|
}
|
|
|
|
#endif
|
|
|
|
static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
|
|
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
return br_add_if(br, slave_dev);
|
|
}
|
|
|
|
static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
return br_del_if(br, slave_dev);
|
|
}
|
|
|
|
static const struct ethtool_ops br_ethtool_ops = {
|
|
.get_drvinfo = br_getinfo,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
static const struct net_device_ops br_netdev_ops = {
|
|
.ndo_open = br_dev_open,
|
|
.ndo_stop = br_dev_stop,
|
|
.ndo_init = br_dev_init,
|
|
.ndo_start_xmit = br_dev_xmit,
|
|
.ndo_get_stats64 = br_get_stats64,
|
|
.ndo_set_mac_address = br_set_mac_address,
|
|
.ndo_set_rx_mode = br_dev_set_multicast_list,
|
|
.ndo_change_mtu = br_change_mtu,
|
|
.ndo_do_ioctl = br_dev_ioctl,
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
.ndo_netpoll_setup = br_netpoll_setup,
|
|
.ndo_netpoll_cleanup = br_netpoll_cleanup,
|
|
.ndo_poll_controller = br_poll_controller,
|
|
#endif
|
|
.ndo_add_slave = br_add_slave,
|
|
.ndo_del_slave = br_del_slave,
|
|
.ndo_fix_features = br_fix_features,
|
|
};
|
|
|
|
static void br_dev_free(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
free_percpu(br->stats);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static struct device_type br_type = {
|
|
.name = "bridge",
|
|
};
|
|
|
|
void br_dev_setup(struct net_device *dev)
|
|
{
|
|
struct net_bridge *br = netdev_priv(dev);
|
|
|
|
eth_hw_addr_random(dev);
|
|
ether_setup(dev);
|
|
|
|
dev->netdev_ops = &br_netdev_ops;
|
|
dev->destructor = br_dev_free;
|
|
SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
|
|
SET_NETDEV_DEVTYPE(dev, &br_type);
|
|
dev->tx_queue_len = 0;
|
|
dev->priv_flags = IFF_EBRIDGE;
|
|
|
|
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
|
|
NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
|
|
NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
|
|
dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
|
|
NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
|
|
NETIF_F_HW_VLAN_TX;
|
|
|
|
br->dev = dev;
|
|
spin_lock_init(&br->lock);
|
|
INIT_LIST_HEAD(&br->port_list);
|
|
spin_lock_init(&br->hash_lock);
|
|
|
|
br->bridge_id.prio[0] = 0x80;
|
|
br->bridge_id.prio[1] = 0x00;
|
|
|
|
memcpy(br->group_addr, br_group_address, ETH_ALEN);
|
|
|
|
br->stp_enabled = BR_NO_STP;
|
|
br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
|
|
|
|
br->designated_root = br->bridge_id;
|
|
br->bridge_max_age = br->max_age = 20 * HZ;
|
|
br->bridge_hello_time = br->hello_time = 2 * HZ;
|
|
br->bridge_forward_delay = br->forward_delay = 15 * HZ;
|
|
br->ageing_time = 300 * HZ;
|
|
|
|
br_netfilter_rtable_init(br);
|
|
br_stp_timer_init(br);
|
|
br_multicast_init(br);
|
|
}
|