1 /* 2 * Device handling code 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 * 8 * $Id: br_device.c,v 1.6 2001/12/24 00:59:55 davem Exp $ 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/netdevice.h> 18 #include <linux/module.h> 19 #include <asm/uaccess.h> 20 #include "br_private.h" 21 22 static struct net_device_stats *br_dev_get_stats(struct net_device *dev) 23 { 24 struct net_bridge *br = netdev_priv(dev); 25 return &br->statistics; 26 } 27 28 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev) 29 { 30 struct net_bridge *br = netdev_priv(dev); 31 const unsigned char *dest = skb->data; 32 struct net_bridge_fdb_entry *dst; 33 34 br->statistics.tx_packets++; 35 br->statistics.tx_bytes += skb->len; 36 37 skb->mac.raw = skb->data; 38 skb_pull(skb, ETH_HLEN); 39 40 rcu_read_lock(); 41 if (dest[0] & 1) 42 br_flood_deliver(br, skb, 0); 43 else if ((dst = __br_fdb_get(br, dest)) != NULL) 44 br_deliver(dst->dst, skb); 45 else 46 br_flood_deliver(br, skb, 0); 47 48 rcu_read_unlock(); 49 return 0; 50 } 51 52 static int br_dev_open(struct net_device *dev) 53 { 54 struct net_bridge *br = netdev_priv(dev); 55 56 br_features_recompute(br); 57 netif_start_queue(dev); 58 br_stp_enable_bridge(br); 59 60 return 0; 61 } 62 63 static void br_dev_set_multicast_list(struct net_device *dev) 64 { 65 } 66 67 static int br_dev_stop(struct net_device *dev) 68 { 69 br_stp_disable_bridge(netdev_priv(dev)); 70 71 netif_stop_queue(dev); 72 73 return 0; 74 } 75 76 static int br_change_mtu(struct net_device *dev, int new_mtu) 77 { 78 if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev))) 79 return -EINVAL; 80 81 dev->mtu = new_mtu; 82 return 0; 83 } 84 85 void br_dev_setup(struct net_device *dev) 86 { 87 memset(dev->dev_addr, 0, ETH_ALEN); 88 89 ether_setup(dev); 90 91 dev->do_ioctl = br_dev_ioctl; 92 dev->get_stats = br_dev_get_stats; 93 dev->hard_start_xmit = br_dev_xmit; 94 dev->open = br_dev_open; 95 dev->set_multicast_list = br_dev_set_multicast_list; 96 dev->change_mtu = br_change_mtu; 97 dev->destructor = free_netdev; 98 SET_MODULE_OWNER(dev); 99 dev->stop = br_dev_stop; 100 dev->tx_queue_len = 0; 101 dev->set_mac_address = NULL; 102 dev->priv_flags = IFF_EBRIDGE; 103 } 104