Initial import

1 files changed, 399 insertions, 0 deletions

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
new file mode 100644
index 000000000..4ff77a169
--- /dev/null
+++ b/net/bridge/br_device.c
@@ -0,0 +1,399 @@
+/*
+ *	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"
+
+#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
+			 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
+
+const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
+EXPORT_SYMBOL_GPL(nf_br_ops);
+
+/* 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 pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
+	const struct nf_br_ops *nf_ops;
+	u16 vid = 0;
+
+	rcu_read_lock();
+	nf_ops = rcu_dereference(nf_br_ops);
+	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
+		rcu_read_unlock();
+		return NETDEV_TX_OK;
+	}
+
+	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);
+
+	if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
+		goto out;
+
+	if (is_broadcast_ether_addr(dest))
+		br_flood_deliver(br, skb, false);
+	else if (is_multicast_ether_addr(dest)) {
+		if (unlikely(netpoll_tx_running(dev))) {
+			br_flood_deliver(br, skb, false);
+			goto out;
+		}
+		if (br_multicast_rcv(br, NULL, skb, vid)) {
+			kfree_skb(skb);
+			goto out;
+		}
+
+		mdst = br_mdb_get(br, skb, vid);
+		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
+		    br_multicast_querier_exists(br, eth_hdr(skb)))
+			br_multicast_deliver(mdst, skb);
+		else
+			br_flood_deliver(br, skb, false);
+	} else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
+		br_deliver(dst->dst, skb);
+	else
+		br_flood_deliver(br, skb, true);
+
+out:
+	rcu_read_unlock();
+	return NETDEV_TX_OK;
+}
+
+static int br_dev_init(struct net_device *dev)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	int err;
+
+	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+	if (!br->stats)
+		return -ENOMEM;
+
+	err = br_vlan_init(br);
+	if (err)
+		free_percpu(br->stats);
+
+	return err;
+}
+
+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 void br_dev_change_rx_flags(struct net_device *dev, int change)
+{
+	if (change & IFF_PROMISC)
+		br_manage_promisc(netdev_priv(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 pcpu_sw_netstats tmp, sum = { 0 };
+	unsigned int cpu;
+
+	for_each_possible_cpu(cpu) {
+		unsigned int start;
+		const struct pcpu_sw_netstats *bstats
+			= per_cpu_ptr(br->stats, cpu);
+		do {
+			start = u64_stats_fetch_begin_irq(&bstats->syncp);
+			memcpy(&tmp, bstats, sizeof(tmp));
+		} while (u64_stats_fetch_retry_irq(&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;
+
+#if IS_ENABLED(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 (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
+		/* Mac address will be changed in br_stp_change_bridge_id(). */
+		br_stp_change_bridge_id(br, addr->sa_data);
+	}
+	spin_unlock_bh(&br->lock);
+
+	return 0;
+}
+
+static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	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));
+}
+
+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;
+
+	list_for_each_entry(p, &br->port_list, list)
+		br_netpoll_disable(p);
+}
+
+static int __br_netpoll_enable(struct net_bridge_port *p)
+{
+	struct netpoll *np;
+	int err;
+
+	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
+	if (!np)
+		return -ENOMEM;
+
+	err = __netpoll_setup(np, p->dev);
+	if (err) {
+		kfree(np);
+		return err;
+	}
+
+	p->np = np;
+	return err;
+}
+
+int br_netpoll_enable(struct net_bridge_port *p)
+{
+	if (!p->br->dev->npinfo)
+		return 0;
+
+	return __br_netpoll_enable(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;
+	int err = 0;
+
+	list_for_each_entry(p, &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;
+}
+
+void br_netpoll_disable(struct net_bridge_port *p)
+{
+	struct netpoll *np = p->np;
+
+	if (!np)
+		return;
+
+	p->np = NULL;
+
+	__netpoll_free_async(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_rx_flags	 = br_dev_change_rx_flags,
+	.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,
+	.ndo_fdb_add		 = br_fdb_add,
+	.ndo_fdb_del		 = br_fdb_delete,
+	.ndo_fdb_dump		 = br_fdb_dump,
+	.ndo_bridge_getlink	 = br_getlink,
+	.ndo_bridge_setlink	 = br_setlink,
+	.ndo_bridge_dellink	 = br_dellink,
+};
+
+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;
+	dev->ethtool_ops = &br_ethtool_ops;
+	SET_NETDEV_DEVTYPE(dev, &br_type);
+	dev->tx_queue_len = 0;
+	dev->priv_flags = IFF_EBRIDGE;
+
+	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
+			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
+			   NETIF_F_HW_VLAN_STAG_TX;
+	dev->vlan_features = COMMON_FEATURES;
+
+	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;
+
+	ether_addr_copy(br->group_addr, eth_reserved_addr_base);
+
+	br->stp_enabled = BR_NO_STP;
+	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
+	br->group_fwd_mask_required = 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);
+}