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; 25 26 br = dev->priv; 27 28 return &br->statistics; 29 } 30 31 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev) 32 { 33 struct net_bridge *br = netdev_priv(dev); 34 const unsigned char *dest = skb->data; 35 struct net_bridge_fdb_entry *dst; 36 37 br->statistics.tx_packets++; 38 br->statistics.tx_bytes += skb->len; 39 40 skb->mac.raw = skb->data; 41 skb_pull(skb, ETH_HLEN); 42 43 rcu_read_lock(); 44 if (dest[0] & 1) 45 br_flood_deliver(br, skb, 0); 46 else if ((dst = __br_fdb_get(br, dest)) != NULL) 47 br_deliver(dst->dst, skb); 48 else 49 br_flood_deliver(br, skb, 0); 50 51 rcu_read_unlock(); 52 return 0; 53 } 54 55 static int br_dev_open(struct net_device *dev) 56 { 57 netif_start_queue(dev); 58 59 br_stp_enable_bridge(dev->priv); 60 61 return 0; 62 } 63 64 static void br_dev_set_multicast_list(struct net_device *dev) 65 { 66 } 67 68 static int br_dev_stop(struct net_device *dev) 69 { 70 br_stp_disable_bridge(dev->priv); 71 72 netif_stop_queue(dev); 73 74 return 0; 75 } 76 77 static int br_change_mtu(struct net_device *dev, int new_mtu) 78 { 79 if ((new_mtu < 68) || new_mtu > br_min_mtu(dev->priv)) 80 return -EINVAL; 81 82 dev->mtu = new_mtu; 83 return 0; 84 } 85 86 void br_dev_setup(struct net_device *dev) 87 { 88 memset(dev->dev_addr, 0, ETH_ALEN); 89 90 ether_setup(dev); 91 92 dev->do_ioctl = br_dev_ioctl; 93 dev->get_stats = br_dev_get_stats; 94 dev->hard_start_xmit = br_dev_xmit; 95 dev->open = br_dev_open; 96 dev->set_multicast_list = br_dev_set_multicast_list; 97 dev->change_mtu = br_change_mtu; 98 dev->destructor = free_netdev; 99 SET_MODULE_OWNER(dev); 100 dev->stop = br_dev_stop; 101 dev->tx_queue_len = 0; 102 dev->set_mac_address = NULL; 103 dev->priv_flags = IFF_EBRIDGE; 104 } 105