1 /* 2 * Device handling code 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/netdevice.h> 16 #include <linux/etherdevice.h> 17 #include <linux/ethtool.h> 18 19 #include <asm/uaccess.h> 20 #include "br_private.h" 21 22 /* net device transmit always called with no BH (preempt_disabled) */ 23 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev) 24 { 25 struct net_bridge *br = netdev_priv(dev); 26 const unsigned char *dest = skb->data; 27 struct net_bridge_fdb_entry *dst; 28 29 dev->stats.tx_packets++; 30 dev->stats.tx_bytes += skb->len; 31 32 skb_reset_mac_header(skb); 33 skb_pull(skb, ETH_HLEN); 34 35 if (dest[0] & 1) 36 br_flood_deliver(br, skb); 37 else if ((dst = __br_fdb_get(br, dest)) != NULL) 38 br_deliver(dst->dst, skb); 39 else 40 br_flood_deliver(br, skb); 41 42 return 0; 43 } 44 45 static int br_dev_open(struct net_device *dev) 46 { 47 struct net_bridge *br = netdev_priv(dev); 48 49 br_features_recompute(br); 50 netif_start_queue(dev); 51 br_stp_enable_bridge(br); 52 53 return 0; 54 } 55 56 static void br_dev_set_multicast_list(struct net_device *dev) 57 { 58 } 59 60 static int br_dev_stop(struct net_device *dev) 61 { 62 br_stp_disable_bridge(netdev_priv(dev)); 63 64 netif_stop_queue(dev); 65 66 return 0; 67 } 68 69 static int br_change_mtu(struct net_device *dev, int new_mtu) 70 { 71 if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev))) 72 return -EINVAL; 73 74 dev->mtu = new_mtu; 75 return 0; 76 } 77 78 /* Allow setting mac address to any valid ethernet address. */ 79 static int br_set_mac_address(struct net_device *dev, void *p) 80 { 81 struct net_bridge *br = netdev_priv(dev); 82 struct sockaddr *addr = p; 83 84 if (!is_valid_ether_addr(addr->sa_data)) 85 return -EINVAL; 86 87 spin_lock_bh(&br->lock); 88 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 89 br_stp_change_bridge_id(br, addr->sa_data); 90 br->flags |= BR_SET_MAC_ADDR; 91 spin_unlock_bh(&br->lock); 92 93 return 0; 94 } 95 96 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) 97 { 98 strcpy(info->driver, "bridge"); 99 strcpy(info->version, BR_VERSION); 100 strcpy(info->fw_version, "N/A"); 101 strcpy(info->bus_info, "N/A"); 102 } 103 104 static int br_set_sg(struct net_device *dev, u32 data) 105 { 106 struct net_bridge *br = netdev_priv(dev); 107 108 if (data) 109 br->feature_mask |= NETIF_F_SG; 110 else 111 br->feature_mask &= ~NETIF_F_SG; 112 113 br_features_recompute(br); 114 return 0; 115 } 116 117 static int br_set_tso(struct net_device *dev, u32 data) 118 { 119 struct net_bridge *br = netdev_priv(dev); 120 121 if (data) 122 br->feature_mask |= NETIF_F_TSO; 123 else 124 br->feature_mask &= ~NETIF_F_TSO; 125 126 br_features_recompute(br); 127 return 0; 128 } 129 130 static int br_set_tx_csum(struct net_device *dev, u32 data) 131 { 132 struct net_bridge *br = netdev_priv(dev); 133 134 if (data) 135 br->feature_mask |= NETIF_F_NO_CSUM; 136 else 137 br->feature_mask &= ~NETIF_F_ALL_CSUM; 138 139 br_features_recompute(br); 140 return 0; 141 } 142 143 static struct ethtool_ops br_ethtool_ops = { 144 .get_drvinfo = br_getinfo, 145 .get_link = ethtool_op_get_link, 146 .set_sg = br_set_sg, 147 .set_tx_csum = br_set_tx_csum, 148 .set_tso = br_set_tso, 149 }; 150 151 void br_dev_setup(struct net_device *dev) 152 { 153 random_ether_addr(dev->dev_addr); 154 ether_setup(dev); 155 156 dev->do_ioctl = br_dev_ioctl; 157 dev->hard_start_xmit = br_dev_xmit; 158 dev->open = br_dev_open; 159 dev->set_multicast_list = br_dev_set_multicast_list; 160 dev->change_mtu = br_change_mtu; 161 dev->destructor = free_netdev; 162 SET_ETHTOOL_OPS(dev, &br_ethtool_ops); 163 dev->stop = br_dev_stop; 164 dev->tx_queue_len = 0; 165 dev->set_mac_address = br_set_mac_address; 166 dev->priv_flags = IFF_EBRIDGE; 167 168 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | 169 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX; 170 } 171