br_device.c 8.8 KB
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/*
 *	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>
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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>
#include "br_private.h"

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#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
			 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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{
	struct net_bridge *br = netdev_priv(dev);
	const unsigned char *dest = skb->data;
	struct net_bridge_fdb_entry *dst;
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	struct net_bridge_mdb_entry *mdst;
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	struct br_cpu_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
	if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
		br_nf_pre_routing_finish_bridge_slow(skb);
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		rcu_read_unlock();
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		return NETDEV_TX_OK;
	}
#endif

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	u64_stats_update_begin(&brstats->syncp);
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	brstats->tx_packets++;
	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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		if (br_multicast_rcv(br, NULL, skb)) {
			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);
		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);
	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)
{
	struct net_bridge *br = netdev_priv(dev);

	br->stats = alloc_percpu(struct br_cpu_netstats);
	if (!br->stats)
		return -ENOMEM;

	return 0;
}

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static int br_dev_open(struct net_device *dev)
{
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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);
	br_stp_enable_bridge(br);
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	br_multicast_open(br);
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	return 0;
}

static void br_dev_set_multicast_list(struct net_device *dev)
{
}

static int br_dev_stop(struct net_device *dev)
{
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	struct net_bridge *br = netdev_priv(dev);

	br_stp_disable_bridge(br);
	br_multicast_stop(br);
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	netif_stop_queue(dev);

	return 0;
}

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static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
						struct rtnl_link_stats64 *stats)
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{
	struct net_bridge *br = netdev_priv(dev);
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	struct br_cpu_netstats tmp, sum = { 0 };
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	unsigned int cpu;

	for_each_possible_cpu(cpu) {
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		unsigned int start;
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		const struct br_cpu_netstats *bstats
			= 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;
		sum.tx_packets += tmp.tx_packets;
		sum.rx_bytes   += tmp.rx_bytes;
		sum.rx_packets += tmp.rx_packets;
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	}

	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;
}

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static int br_change_mtu(struct net_device *dev, int new_mtu)
{
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	struct net_bridge *br = netdev_priv(dev);
	if (new_mtu < 68 || new_mtu > br_min_mtu(br))
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		return -EINVAL;

	dev->mtu = new_mtu;
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#ifdef CONFIG_BRIDGE_NETFILTER
	/* 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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/* 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)
{
	struct net_bridge *br = netdev_priv(dev);
	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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		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);
	}
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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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	strlcpy(info->driver, "bridge", sizeof(info->driver));
	strlcpy(info->version, BR_VERSION, sizeof(info->version));
	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
	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,
	netdev_features_t features)
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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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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_setup(struct net_device *dev, struct netpoll_info *ni,
			    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)
			continue;
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		err = br_netpoll_enable(p, gfp);
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		if (err)
			goto fail;
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	}
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out:
	return err;

fail:
	br_netpoll_cleanup(dev);
	goto out;
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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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	struct netpoll *np;
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	int err;

	if (!p->br->dev->npinfo)
		return 0;
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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) {
		kfree(np);
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		return err;
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	}

	p->np = np;
	return err;
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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;

	if (!np)
		return;

	p->np = NULL;

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	__netpoll_free_async(np);
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}

#endif

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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);
}

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static const struct ethtool_ops br_ethtool_ops = {
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	.get_drvinfo    = br_getinfo,
	.get_link	= ethtool_op_get_link,
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};

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static const struct net_device_ops br_netdev_ops = {
	.ndo_open		 = br_dev_open,
	.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,
	.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,
	.ndo_poll_controller	 = br_poll_controller,
#endif
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	.ndo_add_slave		 = br_add_slave,
	.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,
	.ndo_fdb_del		 = br_fdb_delete,
	.ndo_fdb_dump		 = br_fdb_dump,
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	.ndo_bridge_getlink	 = br_getlink,
	.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)
{
	struct net_bridge *br = netdev_priv(dev);

	free_percpu(br->stats);
	free_netdev(dev);
}

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static struct device_type br_type = {
	.name	= "bridge",
};

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void br_dev_setup(struct net_device *dev)
{
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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;
	dev->priv_flags = IFF_EBRIDGE;
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	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
			NETIF_F_HW_VLAN_CTAG_TX;
	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
	dev->vlan_features = COMMON_FEATURES;
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	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;

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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;
	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);
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}