br_device.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * Device handling code
- * Linux ethernet bridge
- *
- * Authors:
- * Lennert Buytenhek <buytenh@gnu.org>
- *
- * $Id: br_device.c,v 1.5.2.1 2001/12/24 00:59:27 davem Exp $
- *
- * 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/if_bridge.h>
- #include <asm/uaccess.h>
- #include "br_private.h"
- static int br_dev_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
- {
- unsigned long args[4];
- unsigned long *data;
- if (cmd != SIOCDEVPRIVATE)
- return -EOPNOTSUPP;
- data = (unsigned long *)rq->ifr_data;
- if (copy_from_user(args, data, 4*sizeof(unsigned long)))
- return -EFAULT;
- return br_ioctl(dev->priv, args[0], args[1], args[2], args[3]);
- }
- static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
- {
- struct net_bridge *br;
- br = dev->priv;
- return &br->statistics;
- }
- static int __br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct net_bridge *br;
- unsigned char *dest;
- struct net_bridge_fdb_entry *dst;
- br = dev->priv;
- br->statistics.tx_packets++;
- br->statistics.tx_bytes += skb->len;
- dest = skb->mac.raw = skb->data;
- skb_pull(skb, ETH_HLEN);
- if (dest[0] & 1) {
- br_flood_deliver(br, skb, 0);
- return 0;
- }
- if ((dst = br_fdb_get(br, dest)) != NULL) {
- br_deliver(dst->dst, skb);
- br_fdb_put(dst);
- return 0;
- }
- br_flood_deliver(br, skb, 0);
- return 0;
- }
- int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct net_bridge *br;
- int ret;
- br = dev->priv;
- read_lock(&br->lock);
- ret = __br_dev_xmit(skb, dev);
- read_unlock(&br->lock);
- return ret;
- }
- static int br_dev_open(struct net_device *dev)
- {
- struct net_bridge *br;
- netif_start_queue(dev);
- br = dev->priv;
- read_lock(&br->lock);
- br_stp_enable_bridge(br);
- read_unlock(&br->lock);
- 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;
- br = dev->priv;
- read_lock(&br->lock);
- br_stp_disable_bridge(br);
- read_unlock(&br->lock);
- netif_stop_queue(dev);
- return 0;
- }
- static int br_dev_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
- {
- return -1;
- }
- void br_dev_setup(struct net_device *dev)
- {
- memset(dev->dev_addr, 0, ETH_ALEN);
- dev->do_ioctl = br_dev_do_ioctl;
- dev->get_stats = br_dev_get_stats;
- dev->hard_start_xmit = br_dev_xmit;
- dev->open = br_dev_open;
- dev->set_multicast_list = br_dev_set_multicast_list;
- dev->stop = br_dev_stop;
- dev->accept_fastpath = br_dev_accept_fastpath;
- dev->tx_queue_len = 0;
- dev->set_mac_address = NULL;
- }