diff options
Diffstat (limited to 'net/bridge/br_device.c')
| -rw-r--r-- | net/bridge/br_device.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c new file mode 100644 index 000000000..4ff77a169 --- /dev/null +++ b/net/bridge/br_device.c @@ -0,0 +1,399 @@ +/* + * 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/netpoll.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/list.h> +#include <linux/netfilter_bridge.h> + +#include <asm/uaccess.h> +#include "br_private.h" + +#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \ + NETIF_F_GSO_MASK | NETIF_F_HW_CSUM) + +const struct nf_br_ops __rcu *nf_br_ops __read_mostly; +EXPORT_SYMBOL_GPL(nf_br_ops); + +/* net device transmit always called with BH 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; + struct net_bridge_mdb_entry *mdst; + struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats); + const struct nf_br_ops *nf_ops; + u16 vid = 0; + + rcu_read_lock(); + nf_ops = rcu_dereference(nf_br_ops); + if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) { + rcu_read_unlock(); + return NETDEV_TX_OK; + } + + u64_stats_update_begin(&brstats->syncp); + brstats->tx_packets++; + brstats->tx_bytes += skb->len; + u64_stats_update_end(&brstats->syncp); + + BR_INPUT_SKB_CB(skb)->brdev = dev; + + skb_reset_mac_header(skb); + skb_pull(skb, ETH_HLEN); + + if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid)) + goto out; + + if (is_broadcast_ether_addr(dest)) + br_flood_deliver(br, skb, false); + else if (is_multicast_ether_addr(dest)) { + if (unlikely(netpoll_tx_running(dev))) { + br_flood_deliver(br, skb, false); + goto out; + } + if (br_multicast_rcv(br, NULL, skb, vid)) { + kfree_skb(skb); + goto out; + } + + mdst = br_mdb_get(br, skb, vid); + if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) && + br_multicast_querier_exists(br, eth_hdr(skb))) + br_multicast_deliver(mdst, skb); + else + br_flood_deliver(br, skb, false); + } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) + br_deliver(dst->dst, skb); + else + br_flood_deliver(br, skb, true); + +out: + rcu_read_unlock(); + return NETDEV_TX_OK; +} + +static int br_dev_init(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + int err; + + br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); + if (!br->stats) + return -ENOMEM; + + err = br_vlan_init(br); + if (err) + free_percpu(br->stats); + + return err; +} + +static int br_dev_open(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + + netdev_update_features(dev); + netif_start_queue(dev); + br_stp_enable_bridge(br); + br_multicast_open(br); + + return 0; +} + +static void br_dev_set_multicast_list(struct net_device *dev) +{ +} + +static void br_dev_change_rx_flags(struct net_device *dev, int change) +{ + if (change & IFF_PROMISC) + br_manage_promisc(netdev_priv(dev)); +} + +static int br_dev_stop(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + + br_stp_disable_bridge(br); + br_multicast_stop(br); + + netif_stop_queue(dev); + + return 0; +} + +static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *stats) +{ + struct net_bridge *br = netdev_priv(dev); + struct pcpu_sw_netstats tmp, sum = { 0 }; + unsigned int cpu; + + for_each_possible_cpu(cpu) { + unsigned int start; + const struct pcpu_sw_netstats *bstats + = per_cpu_ptr(br->stats, cpu); + do { + start = u64_stats_fetch_begin_irq(&bstats->syncp); + memcpy(&tmp, bstats, sizeof(tmp)); + } while (u64_stats_fetch_retry_irq(&bstats->syncp, start)); + sum.tx_bytes += tmp.tx_bytes; + sum.tx_packets += tmp.tx_packets; + sum.rx_bytes += tmp.rx_bytes; + sum.rx_packets += tmp.rx_packets; + } + + stats->tx_bytes = sum.tx_bytes; + stats->tx_packets = sum.tx_packets; + stats->rx_bytes = sum.rx_bytes; + stats->rx_packets = sum.rx_packets; + + return stats; +} + +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; + +#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) + /* remember the MTU in the rtable for PMTU */ + dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, 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 -EADDRNOTAVAIL; + + spin_lock_bh(&br->lock); + if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) { + /* Mac address will be changed in br_stp_change_bridge_id(). */ + br_stp_change_bridge_id(br, addr->sa_data); + } + spin_unlock_bh(&br->lock); + + return 0; +} + +static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + strlcpy(info->driver, "bridge", sizeof(info->driver)); + strlcpy(info->version, BR_VERSION, sizeof(info->version)); + strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); + strlcpy(info->bus_info, "N/A", sizeof(info->bus_info)); +} + +static netdev_features_t br_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct net_bridge *br = netdev_priv(dev); + + return br_features_recompute(br, features); +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +static void br_poll_controller(struct net_device *br_dev) +{ +} + +static void br_netpoll_cleanup(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + struct net_bridge_port *p; + + list_for_each_entry(p, &br->port_list, list) + br_netpoll_disable(p); +} + +static int __br_netpoll_enable(struct net_bridge_port *p) +{ + struct netpoll *np; + int err; + + np = kzalloc(sizeof(*p->np), GFP_KERNEL); + if (!np) + return -ENOMEM; + + err = __netpoll_setup(np, p->dev); + if (err) { + kfree(np); + return err; + } + + p->np = np; + return err; +} + +int br_netpoll_enable(struct net_bridge_port *p) +{ + if (!p->br->dev->npinfo) + return 0; + + return __br_netpoll_enable(p); +} + +static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) +{ + struct net_bridge *br = netdev_priv(dev); + struct net_bridge_port *p; + int err = 0; + + list_for_each_entry(p, &br->port_list, list) { + if (!p->dev) + continue; + err = __br_netpoll_enable(p); + if (err) + goto fail; + } + +out: + return err; + +fail: + br_netpoll_cleanup(dev); + goto out; +} + +void br_netpoll_disable(struct net_bridge_port *p) +{ + struct netpoll *np = p->np; + + if (!np) + return; + + p->np = NULL; + + __netpoll_free_async(np); +} + +#endif + +static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) + +{ + struct net_bridge *br = netdev_priv(dev); + + return br_add_if(br, slave_dev); +} + +static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) +{ + struct net_bridge *br = netdev_priv(dev); + + return br_del_if(br, slave_dev); +} + +static const struct ethtool_ops br_ethtool_ops = { + .get_drvinfo = br_getinfo, + .get_link = ethtool_op_get_link, +}; + +static const struct net_device_ops br_netdev_ops = { + .ndo_open = br_dev_open, + .ndo_stop = br_dev_stop, + .ndo_init = br_dev_init, + .ndo_start_xmit = br_dev_xmit, + .ndo_get_stats64 = br_get_stats64, + .ndo_set_mac_address = br_set_mac_address, + .ndo_set_rx_mode = br_dev_set_multicast_list, + .ndo_change_rx_flags = br_dev_change_rx_flags, + .ndo_change_mtu = br_change_mtu, + .ndo_do_ioctl = br_dev_ioctl, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_netpoll_setup = br_netpoll_setup, + .ndo_netpoll_cleanup = br_netpoll_cleanup, + .ndo_poll_controller = br_poll_controller, +#endif + .ndo_add_slave = br_add_slave, + .ndo_del_slave = br_del_slave, + .ndo_fix_features = br_fix_features, + .ndo_fdb_add = br_fdb_add, + .ndo_fdb_del = br_fdb_delete, + .ndo_fdb_dump = br_fdb_dump, + .ndo_bridge_getlink = br_getlink, + .ndo_bridge_setlink = br_setlink, + .ndo_bridge_dellink = br_dellink, +}; + +static void br_dev_free(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + + free_percpu(br->stats); + free_netdev(dev); +} + +static struct device_type br_type = { + .name = "bridge", +}; + +void br_dev_setup(struct net_device *dev) +{ + struct net_bridge *br = netdev_priv(dev); + + eth_hw_addr_random(dev); + ether_setup(dev); + + dev->netdev_ops = &br_netdev_ops; + dev->destructor = br_dev_free; + dev->ethtool_ops = &br_ethtool_ops; + SET_NETDEV_DEVTYPE(dev, &br_type); + dev->tx_queue_len = 0; + dev->priv_flags = IFF_EBRIDGE; + + dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | + NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; + dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | + NETIF_F_HW_VLAN_STAG_TX; + dev->vlan_features = COMMON_FEATURES; + + br->dev = dev; + spin_lock_init(&br->lock); + INIT_LIST_HEAD(&br->port_list); + spin_lock_init(&br->hash_lock); + + br->bridge_id.prio[0] = 0x80; + br->bridge_id.prio[1] = 0x00; + + ether_addr_copy(br->group_addr, eth_reserved_addr_base); + + br->stp_enabled = BR_NO_STP; + br->group_fwd_mask = BR_GROUPFWD_DEFAULT; + br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; + + br->designated_root = br->bridge_id; + br->bridge_max_age = br->max_age = 20 * HZ; + br->bridge_hello_time = br->hello_time = 2 * HZ; + br->bridge_forward_delay = br->forward_delay = 15 * HZ; + br->ageing_time = 300 * HZ; + + br_netfilter_rtable_init(br); + br_stp_timer_init(br); + br_multicast_init(br); +} |