/* * Device handling code * Linux ethernet bridge * * Authors: * Lennert Buytenhek <buytenh@gnu.org> * * 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/etherdevice.h> #include <linux/ethtool.h> #include <asm/uaccess.h> #include "br_private.h" /* net device transmit always called with no BH (preempt_disabled) */ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); const unsigned char *dest = skb->data; struct net_bridge_fdb_entry *dst; dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; skb_reset_mac_header(skb); skb_pull(skb, ETH_HLEN); if (dest[0] & 1) br_flood_deliver(br, skb); else if ((dst = __br_fdb_get(br, dest)) != NULL) br_deliver(dst->dst, skb); else br_flood_deliver(br, skb); return NETDEV_TX_OK; } static int br_dev_open(struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); br_features_recompute(br); netif_start_queue(dev); br_stp_enable_bridge(br); return 0; } static void br_dev_set_multicast_list(struct net_device *dev) { } static int br_dev_stop(struct net_device *dev) { br_stp_disable_bridge(netdev_priv(dev)); netif_stop_queue(dev); return 0; } static int br_change_mtu(struct net_device *dev, int new_mtu) { struct net_bridge *br = netdev_priv(dev); if (new_mtu < 68 || new_mtu > br_min_mtu(br)) return -EINVAL; dev->mtu = new_mtu; #ifdef CONFIG_BRIDGE_NETFILTER /* remember the MTU in the rtable for PMTU */ br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu; #endif return 0; } /* Allow setting mac address to any valid ethernet address. */ static int br_set_mac_address(struct net_device *dev, void *p) { struct net_bridge *br = netdev_priv(dev); struct sockaddr *addr = p; if (!is_valid_ether_addr(addr->sa_data)) return -EINVAL; spin_lock_bh(&br->lock); memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); br_stp_change_bridge_id(br, addr->sa_data); br->flags |= BR_SET_MAC_ADDR; spin_unlock_bh(&br->lock); return 0; } static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) { strcpy(info->driver, "bridge"); strcpy(info->version, BR_VERSION); strcpy(info->fw_version, "N/A"); strcpy(info->bus_info, "N/A"); } static int br_set_sg(struct net_device *dev, u32 data) { struct net_bridge *br = netdev_priv(dev); if (data) br->feature_mask |= NETIF_F_SG; else br->feature_mask &= ~NETIF_F_SG; br_features_recompute(br); return 0; } static int br_set_tso(struct net_device *dev, u32 data) { struct net_bridge *br = netdev_priv(dev); if (data) br->feature_mask |= NETIF_F_TSO; else br->feature_mask &= ~NETIF_F_TSO; br_features_recompute(br); return 0; } static int br_set_tx_csum(struct net_device *dev, u32 data) { struct net_bridge *br = netdev_priv(dev); if (data) br->feature_mask |= NETIF_F_NO_CSUM; else br->feature_mask &= ~NETIF_F_ALL_CSUM; br_features_recompute(br); return 0; } static const struct ethtool_ops br_ethtool_ops = { .get_drvinfo = br_getinfo, .get_link = ethtool_op_get_link, .get_tx_csum = ethtool_op_get_tx_csum, .set_tx_csum = br_set_tx_csum, .get_sg = ethtool_op_get_sg, .set_sg = br_set_sg, .get_tso = ethtool_op_get_tso, .set_tso = br_set_tso, .get_ufo = ethtool_op_get_ufo, .set_ufo = ethtool_op_set_ufo, .get_flags = ethtool_op_get_flags, }; static const struct net_device_ops br_netdev_ops = { .ndo_open = br_dev_open, .ndo_stop = br_dev_stop, .ndo_start_xmit = br_dev_xmit, .ndo_set_mac_address = br_set_mac_address, .ndo_set_multicast_list = br_dev_set_multicast_list, .ndo_change_mtu = br_change_mtu, .ndo_do_ioctl = br_dev_ioctl, }; void br_dev_setup(struct net_device *dev) { random_ether_addr(dev->dev_addr); ether_setup(dev); dev->netdev_ops = &br_netdev_ops; dev->destructor = free_netdev; SET_ETHTOOL_OPS(dev, &br_ethtool_ops); dev->tx_queue_len = 0; dev->priv_flags = IFF_EBRIDGE; dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | NETIF_F_GSO; }