root/net/bridge/br_device.c

DEFINITIONS

1. br_dev_xmit
2. br_dev_open
3. br_dev_set_multicast_list
4. br_dev_stop
5. br_change_mtu
6. br_set_mac_address
7. br_getinfo
8. br_set_sg
9. br_set_tso
10. br_set_tx_csum
11. br_dev_setup

/*
 *      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/etherdevice.h>
#include <linux/ethtool.h>

#include <asm/uaccess.h>
#include "br_private.h"

/* net device transmit always called with no BH (preempt_disabled) */
int 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;

        dev->stats.tx_packets++;
        dev->stats.tx_bytes += skb->len;

        skb_reset_mac_header(skb);
        skb_pull(skb, ETH_HLEN);

        if (dest[0] & 1)
                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);

        return 0;
}

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

        br_features_recompute(br);
        netif_start_queue(dev);
        br_stp_enable_bridge(br);

        return 0;
}

static void br_dev_set_multicast_list(struct net_device *dev)
{
}

static int br_dev_stop(struct net_device *dev)
{
        br_stp_disable_bridge(netdev_priv(dev));

        netif_stop_queue(dev);

        return 0;
}

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 */
        br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = 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 -EINVAL;

        spin_lock_bh(&br->lock);
        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
        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 int br_set_sg(struct net_device *dev, u32 data)
{
        struct net_bridge *br = netdev_priv(dev);

        if (data)
                br->feature_mask |= NETIF_F_SG;
        else
                br->feature_mask &= ~NETIF_F_SG;

        br_features_recompute(br);
        return 0;
}

static int br_set_tso(struct net_device *dev, u32 data)
{
        struct net_bridge *br = netdev_priv(dev);

        if (data)
                br->feature_mask |= NETIF_F_TSO;
        else
                br->feature_mask &= ~NETIF_F_TSO;

        br_features_recompute(br);
        return 0;
}

static int br_set_tx_csum(struct net_device *dev, u32 data)
{
        struct net_bridge *br = netdev_priv(dev);

        if (data)
                br->feature_mask |= NETIF_F_NO_CSUM;
        else
                br->feature_mask &= ~NETIF_F_ALL_CSUM;

        br_features_recompute(br);
        return 0;
}

static struct ethtool_ops br_ethtool_ops = {
        .get_drvinfo    = br_getinfo,
        .get_link       = ethtool_op_get_link,
        .get_tx_csum    = ethtool_op_get_tx_csum,
        .set_tx_csum    = br_set_tx_csum,
        .get_sg         = ethtool_op_get_sg,
        .set_sg         = br_set_sg,
        .get_tso        = ethtool_op_get_tso,
        .set_tso        = br_set_tso,
        .get_ufo        = ethtool_op_get_ufo,
        .get_flags      = ethtool_op_get_flags,
};

void br_dev_setup(struct net_device *dev)
{
        random_ether_addr(dev->dev_addr);
        ether_setup(dev);

        dev->do_ioctl = br_dev_ioctl;
        dev->hard_start_xmit = br_dev_xmit;
        dev->open = br_dev_open;
        dev->set_multicast_list = br_dev_set_multicast_list;
        dev->change_mtu = br_change_mtu;
        dev->destructor = free_netdev;
        SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
        dev->stop = br_dev_stop;
        dev->tx_queue_len = 0;
        dev->set_mac_address = br_set_mac_address;
        dev->priv_flags = IFF_EBRIDGE;

        dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
                        NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
                        NETIF_F_NETNS_LOCAL;
}