v4.19.13 snapshot.
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
new file mode 100644
index 0000000..e682a66
--- /dev/null
+++ b/net/bridge/br_device.c
@@ -0,0 +1,451 @@
+/*
+ * 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 <linux/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);
+
+static struct lock_class_key bridge_netdev_addr_lock_key;
+
+/* 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);
+ 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;
+ const unsigned char *dest;
+ struct ethhdr *eth;
+ 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_switchdev_frame_unmark(skb);
+ BR_INPUT_SKB_CB(skb)->brdev = dev;
+
+ skb_reset_mac_header(skb);
+ eth = eth_hdr(skb);
+ skb_pull(skb, ETH_HLEN);
+
+ if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
+ goto out;
+
+ if (IS_ENABLED(CONFIG_INET) &&
+ (eth->h_proto == htons(ETH_P_ARP) ||
+ eth->h_proto == htons(ETH_P_RARP)) &&
+ br->neigh_suppress_enabled) {
+ br_do_proxy_suppress_arp(skb, br, vid, NULL);
+ } else if (IS_ENABLED(CONFIG_IPV6) &&
+ skb->protocol == htons(ETH_P_IPV6) &&
+ br->neigh_suppress_enabled &&
+ pskb_may_pull(skb, sizeof(struct ipv6hdr) +
+ sizeof(struct nd_msg)) &&
+ ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
+ struct nd_msg *msg, _msg;
+
+ msg = br_is_nd_neigh_msg(skb, &_msg);
+ if (msg)
+ br_do_suppress_nd(skb, br, vid, NULL, msg);
+ }
+
+ dest = eth_hdr(skb)->h_dest;
+ if (is_broadcast_ether_addr(dest)) {
+ br_flood(br, skb, BR_PKT_BROADCAST, false, true);
+ } else if (is_multicast_ether_addr(dest)) {
+ if (unlikely(netpoll_tx_running(dev))) {
+ br_flood(br, skb, BR_PKT_MULTICAST, false, true);
+ 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_flood(mdst, skb, false, true);
+ else
+ br_flood(br, skb, BR_PKT_MULTICAST, false, true);
+ } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
+ br_forward(dst->dst, skb, false, true);
+ } else {
+ br_flood(br, skb, BR_PKT_UNICAST, false, true);
+ }
+out:
+ rcu_read_unlock();
+ return NETDEV_TX_OK;
+}
+
+static void br_set_lockdep_class(struct net_device *dev)
+{
+ lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
+}
+
+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_fdb_hash_init(br);
+ if (err) {
+ free_percpu(br->stats);
+ return err;
+ }
+
+ err = br_vlan_init(br);
+ if (err) {
+ free_percpu(br->stats);
+ br_fdb_hash_fini(br);
+ return err;
+ }
+
+ err = br_multicast_init_stats(br);
+ if (err) {
+ free_percpu(br->stats);
+ br_vlan_flush(br);
+ br_fdb_hash_fini(br);
+ }
+ br_set_lockdep_class(dev);
+
+ return err;
+}
+
+static void br_dev_uninit(struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+
+ br_multicast_dev_del(br);
+ br_multicast_uninit_stats(br);
+ br_vlan_flush(br);
+ br_fdb_hash_fini(br);
+ free_percpu(br->stats);
+}
+
+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 void 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;
+}
+
+static int br_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct net_bridge *br = netdev_priv(dev);
+
+ dev->mtu = new_mtu;
+
+ /* this flag will be cleared if the MTU was automatically adjusted */
+ br->mtu_set_by_user = true;
+#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 netlink_ext_ack *extack)
+
+{
+ struct net_bridge *br = netdev_priv(dev);
+
+ return br_add_if(br, slave_dev, extack);
+}
+
+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_uninit = br_dev_uninit,
+ .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,
+ .ndo_features_check = passthru_features_check,
+};
+
+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->needs_free_netdev = true;
+ dev->ethtool_ops = &br_ethtool_ops;
+ SET_NETDEV_DEVTYPE(dev, &br_type);
+ dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
+
+ 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);
+ INIT_HLIST_HEAD(&br->fdb_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_stp_addr);
+
+ 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->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
+ dev->max_mtu = ETH_MAX_MTU;
+
+ br_netfilter_rtable_init(br);
+ br_stp_timer_init(br);
+ br_multicast_init(br);
+ INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
+}