460 lines
11 KiB
C
460 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Device handling code
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/netpoll.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/list.h>
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#include <linux/netfilter_bridge.h>
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#include <linux/uaccess.h>
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#include "br_private.h"
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#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
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NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
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const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
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EXPORT_SYMBOL_GPL(nf_br_ops);
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static struct lock_class_key bridge_netdev_addr_lock_key;
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/* net device transmit always called with BH disabled */
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netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_fdb_entry *dst;
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struct net_bridge_mdb_entry *mdst;
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struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
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const struct nf_br_ops *nf_ops;
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const unsigned char *dest;
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struct ethhdr *eth;
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u16 vid = 0;
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rcu_read_lock();
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nf_ops = rcu_dereference(nf_br_ops);
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if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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u64_stats_update_begin(&brstats->syncp);
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brstats->tx_packets++;
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brstats->tx_bytes += skb->len;
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u64_stats_update_end(&brstats->syncp);
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br_switchdev_frame_unmark(skb);
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BR_INPUT_SKB_CB(skb)->brdev = dev;
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BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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skb_pull(skb, ETH_HLEN);
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if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
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goto out;
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if (IS_ENABLED(CONFIG_INET) &&
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(eth->h_proto == htons(ETH_P_ARP) ||
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eth->h_proto == htons(ETH_P_RARP)) &&
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br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
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br_do_proxy_suppress_arp(skb, br, vid, NULL);
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} else if (IS_ENABLED(CONFIG_IPV6) &&
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skb->protocol == htons(ETH_P_IPV6) &&
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br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
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pskb_may_pull(skb, sizeof(struct ipv6hdr) +
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sizeof(struct nd_msg)) &&
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ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
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struct nd_msg *msg, _msg;
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msg = br_is_nd_neigh_msg(skb, &_msg);
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if (msg)
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br_do_suppress_nd(skb, br, vid, NULL, msg);
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}
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dest = eth_hdr(skb)->h_dest;
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if (is_broadcast_ether_addr(dest)) {
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br_flood(br, skb, BR_PKT_BROADCAST, false, true);
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} else if (is_multicast_ether_addr(dest)) {
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if (unlikely(netpoll_tx_running(dev))) {
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br_flood(br, skb, BR_PKT_MULTICAST, false, true);
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goto out;
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}
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if (br_multicast_rcv(br, NULL, skb, vid)) {
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kfree_skb(skb);
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goto out;
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}
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mdst = br_mdb_get(br, skb, vid);
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if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
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br_multicast_querier_exists(br, eth_hdr(skb)))
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br_multicast_flood(mdst, skb, false, true);
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else
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br_flood(br, skb, BR_PKT_MULTICAST, false, true);
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} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
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br_forward(dst->dst, skb, false, true);
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} else {
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br_flood(br, skb, BR_PKT_UNICAST, false, true);
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}
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out:
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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static void br_set_lockdep_class(struct net_device *dev)
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{
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lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
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}
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static int br_dev_init(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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int err;
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br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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if (!br->stats)
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return -ENOMEM;
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err = br_fdb_hash_init(br);
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if (err) {
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free_percpu(br->stats);
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return err;
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}
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err = br_mdb_hash_init(br);
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if (err) {
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free_percpu(br->stats);
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br_fdb_hash_fini(br);
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return err;
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}
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err = br_vlan_init(br);
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if (err) {
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free_percpu(br->stats);
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br_mdb_hash_fini(br);
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br_fdb_hash_fini(br);
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return err;
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}
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err = br_multicast_init_stats(br);
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if (err) {
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free_percpu(br->stats);
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br_vlan_flush(br);
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br_mdb_hash_fini(br);
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br_fdb_hash_fini(br);
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}
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br_set_lockdep_class(dev);
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return err;
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}
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static void br_dev_uninit(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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br_multicast_dev_del(br);
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br_multicast_uninit_stats(br);
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br_vlan_flush(br);
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br_mdb_hash_fini(br);
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br_fdb_hash_fini(br);
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free_percpu(br->stats);
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}
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static int br_dev_open(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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netdev_update_features(dev);
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netif_start_queue(dev);
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br_stp_enable_bridge(br);
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br_multicast_open(br);
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return 0;
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}
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static void br_dev_set_multicast_list(struct net_device *dev)
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{
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}
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static void br_dev_change_rx_flags(struct net_device *dev, int change)
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{
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if (change & IFF_PROMISC)
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br_manage_promisc(netdev_priv(dev));
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}
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static int br_dev_stop(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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br_stp_disable_bridge(br);
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br_multicast_stop(br);
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netif_stop_queue(dev);
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return 0;
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}
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static void br_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct pcpu_sw_netstats tmp, sum = { 0 };
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unsigned int cpu;
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for_each_possible_cpu(cpu) {
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unsigned int start;
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const struct pcpu_sw_netstats *bstats
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= per_cpu_ptr(br->stats, cpu);
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do {
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start = u64_stats_fetch_begin_irq(&bstats->syncp);
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memcpy(&tmp, bstats, sizeof(tmp));
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} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
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sum.tx_bytes += tmp.tx_bytes;
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sum.tx_packets += tmp.tx_packets;
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sum.rx_bytes += tmp.rx_bytes;
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sum.rx_packets += tmp.rx_packets;
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}
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stats->tx_bytes = sum.tx_bytes;
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stats->tx_packets = sum.tx_packets;
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stats->rx_bytes = sum.rx_bytes;
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stats->rx_packets = sum.rx_packets;
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}
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static int br_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct net_bridge *br = netdev_priv(dev);
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dev->mtu = new_mtu;
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/* this flag will be cleared if the MTU was automatically adjusted */
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br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
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#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
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/* remember the MTU in the rtable for PMTU */
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dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
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#endif
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return 0;
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}
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/* Allow setting mac address to any valid ethernet address. */
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static int br_set_mac_address(struct net_device *dev, void *p)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct sockaddr *addr = p;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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spin_lock_bh(&br->lock);
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if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
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/* Mac address will be changed in br_stp_change_bridge_id(). */
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br_stp_change_bridge_id(br, addr->sa_data);
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}
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spin_unlock_bh(&br->lock);
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return 0;
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}
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static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, "bridge", sizeof(info->driver));
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strlcpy(info->version, BR_VERSION, sizeof(info->version));
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strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
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strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
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}
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static netdev_features_t br_fix_features(struct net_device *dev,
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netdev_features_t features)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_features_recompute(br, features);
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void br_poll_controller(struct net_device *br_dev)
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{
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}
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static void br_netpoll_cleanup(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list)
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br_netpoll_disable(p);
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}
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static int __br_netpoll_enable(struct net_bridge_port *p)
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{
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struct netpoll *np;
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int err;
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np = kzalloc(sizeof(*p->np), GFP_KERNEL);
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if (!np)
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return -ENOMEM;
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err = __netpoll_setup(np, p->dev);
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if (err) {
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kfree(np);
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return err;
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}
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p->np = np;
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return err;
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}
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int br_netpoll_enable(struct net_bridge_port *p)
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{
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if (!p->br->dev->npinfo)
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return 0;
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return __br_netpoll_enable(p);
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}
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static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p;
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int err = 0;
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list_for_each_entry(p, &br->port_list, list) {
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if (!p->dev)
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continue;
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err = __br_netpoll_enable(p);
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if (err)
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goto fail;
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}
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out:
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return err;
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fail:
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br_netpoll_cleanup(dev);
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goto out;
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}
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void br_netpoll_disable(struct net_bridge_port *p)
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{
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struct netpoll *np = p->np;
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if (!np)
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return;
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p->np = NULL;
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__netpoll_free(np);
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}
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#endif
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static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
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struct netlink_ext_ack *extack)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_add_if(br, slave_dev, extack);
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}
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static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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return br_del_if(br, slave_dev);
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}
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static const struct ethtool_ops br_ethtool_ops = {
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.get_drvinfo = br_getinfo,
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.get_link = ethtool_op_get_link,
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};
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static const struct net_device_ops br_netdev_ops = {
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.ndo_open = br_dev_open,
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.ndo_stop = br_dev_stop,
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.ndo_init = br_dev_init,
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.ndo_uninit = br_dev_uninit,
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.ndo_start_xmit = br_dev_xmit,
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.ndo_get_stats64 = br_get_stats64,
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.ndo_set_mac_address = br_set_mac_address,
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.ndo_set_rx_mode = br_dev_set_multicast_list,
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.ndo_change_rx_flags = br_dev_change_rx_flags,
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.ndo_change_mtu = br_change_mtu,
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.ndo_do_ioctl = br_dev_ioctl,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_netpoll_setup = br_netpoll_setup,
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.ndo_netpoll_cleanup = br_netpoll_cleanup,
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.ndo_poll_controller = br_poll_controller,
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#endif
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.ndo_add_slave = br_add_slave,
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.ndo_del_slave = br_del_slave,
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.ndo_fix_features = br_fix_features,
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.ndo_fdb_add = br_fdb_add,
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.ndo_fdb_del = br_fdb_delete,
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.ndo_fdb_dump = br_fdb_dump,
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.ndo_fdb_get = br_fdb_get,
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.ndo_bridge_getlink = br_getlink,
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.ndo_bridge_setlink = br_setlink,
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.ndo_bridge_dellink = br_dellink,
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.ndo_features_check = passthru_features_check,
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};
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static struct device_type br_type = {
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.name = "bridge",
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};
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void br_dev_setup(struct net_device *dev)
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{
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struct net_bridge *br = netdev_priv(dev);
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eth_hw_addr_random(dev);
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ether_setup(dev);
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dev->netdev_ops = &br_netdev_ops;
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dev->needs_free_netdev = true;
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dev->ethtool_ops = &br_ethtool_ops;
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SET_NETDEV_DEVTYPE(dev, &br_type);
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dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
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dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
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NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
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dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
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NETIF_F_HW_VLAN_STAG_TX;
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dev->vlan_features = COMMON_FEATURES;
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br->dev = dev;
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spin_lock_init(&br->lock);
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INIT_LIST_HEAD(&br->port_list);
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INIT_HLIST_HEAD(&br->fdb_list);
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spin_lock_init(&br->hash_lock);
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br->bridge_id.prio[0] = 0x80;
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br->bridge_id.prio[1] = 0x00;
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ether_addr_copy(br->group_addr, eth_stp_addr);
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br->stp_enabled = BR_NO_STP;
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br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
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br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
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br->designated_root = br->bridge_id;
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br->bridge_max_age = br->max_age = 20 * HZ;
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br->bridge_hello_time = br->hello_time = 2 * HZ;
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br->bridge_forward_delay = br->forward_delay = 15 * HZ;
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br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
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dev->max_mtu = ETH_MAX_MTU;
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br_netfilter_rtable_init(br);
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br_stp_timer_init(br);
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br_multicast_init(br);
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INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
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}
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