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/etherdevice.h> 19 #include <linux/ethtool.h> 20 21 #include <asm/uaccess.h> 22 #include "br_private.h" 23 24 static struct net_device_stats *br_dev_get_stats(struct net_device *dev) 25 { 26 struct net_bridge *br = netdev_priv(dev); 27 return &br->statistics; 28 } 29 30 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev) 31 { 32 struct net_bridge *br = netdev_priv(dev); 33 const unsigned char *dest = skb->data; 34 struct net_bridge_fdb_entry *dst; 35 36 br->statistics.tx_packets++; 37 br->statistics.tx_bytes += skb->len; 38 39 skb->mac.raw = skb->data; 40 skb_pull(skb, ETH_HLEN); 41 42 rcu_read_lock(); 43 if (dest[0] & 1) 44 br_flood_deliver(br, skb, 0); 45 else if ((dst = __br_fdb_get(br, dest)) != NULL) 46 br_deliver(dst->dst, skb); 47 else 48 br_flood_deliver(br, skb, 0); 49 50 rcu_read_unlock(); 51 return 0; 52 } 53 54 static int br_dev_open(struct net_device *dev) 55 { 56 struct net_bridge *br = netdev_priv(dev); 57 58 br_features_recompute(br); 59 netif_start_queue(dev); 60 br_stp_enable_bridge(br); 61 62 return 0; 63 } 64 65 static void br_dev_set_multicast_list(struct net_device *dev) 66 { 67 } 68 69 static int br_dev_stop(struct net_device *dev) 70 { 71 br_stp_disable_bridge(netdev_priv(dev)); 72 73 netif_stop_queue(dev); 74 75 return 0; 76 } 77 78 static int br_change_mtu(struct net_device *dev, int new_mtu) 79 { 80 if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev))) 81 return -EINVAL; 82 83 dev->mtu = new_mtu; 84 return 0; 85 } 86 87 /* Allow setting mac address of pseudo-bridge to be same as 88 * any of the bound interfaces 89 */ 90 static int br_set_mac_address(struct net_device *dev, void *p) 91 { 92 struct net_bridge *br = netdev_priv(dev); 93 struct sockaddr *addr = p; 94 struct net_bridge_port *port; 95 int err = -EADDRNOTAVAIL; 96 97 spin_lock_bh(&br->lock); 98 list_for_each_entry(port, &br->port_list, list) { 99 if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) { 100 br_stp_change_bridge_id(br, addr->sa_data); 101 err = 0; 102 break; 103 } 104 } 105 spin_unlock_bh(&br->lock); 106 107 return err; 108 } 109 110 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) 111 { 112 strcpy(info->driver, "bridge"); 113 strcpy(info->version, BR_VERSION); 114 strcpy(info->fw_version, "N/A"); 115 strcpy(info->bus_info, "N/A"); 116 } 117 118 static int br_set_sg(struct net_device *dev, u32 data) 119 { 120 struct net_bridge *br = netdev_priv(dev); 121 122 if (data) 123 br->feature_mask |= NETIF_F_SG; 124 else 125 br->feature_mask &= ~NETIF_F_SG; 126 127 br_features_recompute(br); 128 return 0; 129 } 130 131 static int br_set_tso(struct net_device *dev, u32 data) 132 { 133 struct net_bridge *br = netdev_priv(dev); 134 135 if (data) 136 br->feature_mask |= NETIF_F_TSO; 137 else 138 br->feature_mask &= ~NETIF_F_TSO; 139 140 br_features_recompute(br); 141 return 0; 142 } 143 144 static int br_set_tx_csum(struct net_device *dev, u32 data) 145 { 146 struct net_bridge *br = netdev_priv(dev); 147 148 if (data) 149 br->feature_mask |= NETIF_F_IP_CSUM; 150 else 151 br->feature_mask &= ~NETIF_F_IP_CSUM; 152 153 br_features_recompute(br); 154 return 0; 155 } 156 157 static struct ethtool_ops br_ethtool_ops = { 158 .get_drvinfo = br_getinfo, 159 .get_link = ethtool_op_get_link, 160 .get_sg = ethtool_op_get_sg, 161 .set_sg = br_set_sg, 162 .get_tx_csum = ethtool_op_get_tx_csum, 163 .set_tx_csum = br_set_tx_csum, 164 .get_tso = ethtool_op_get_tso, 165 .set_tso = br_set_tso, 166 }; 167 168 void br_dev_setup(struct net_device *dev) 169 { 170 memset(dev->dev_addr, 0, ETH_ALEN); 171 172 ether_setup(dev); 173 174 dev->do_ioctl = br_dev_ioctl; 175 dev->get_stats = br_dev_get_stats; 176 dev->hard_start_xmit = br_dev_xmit; 177 dev->open = br_dev_open; 178 dev->set_multicast_list = br_dev_set_multicast_list; 179 dev->change_mtu = br_change_mtu; 180 dev->destructor = free_netdev; 181 SET_MODULE_OWNER(dev); 182 SET_ETHTOOL_OPS(dev, &br_ethtool_ops); 183 dev->stop = br_dev_stop; 184 dev->tx_queue_len = 0; 185 dev->set_mac_address = br_set_mac_address; 186 dev->priv_flags = IFF_EBRIDGE; 187 188 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST 189 | NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_IP_CSUM; 190 } 191