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489 lines
12 KiB
489 lines
12 KiB
// 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 <[email protected]> |
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*/ |
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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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/* 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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u8 state = BR_STATE_FORWARDING; |
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const unsigned char *dest; |
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u16 vid = 0; |
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memset(skb->cb, 0, sizeof(struct br_input_skb_cb)); |
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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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skb_pull(skb, ETH_HLEN); |
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if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid, &state)) |
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goto out; |
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if (IS_ENABLED(CONFIG_INET) && |
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(eth_hdr(skb)->h_proto == htons(ETH_P_ARP) || |
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eth_hdr(skb)->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 struct lock_class_key bridge_netdev_addr_lock_key; |
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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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if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
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br_multicast_join_snoopers(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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if (br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
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br_multicast_leave_snoopers(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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netdev_stats_to_stats64(stats, &dev->stats); |
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dev_fetch_sw_netstats(stats, br->stats); |
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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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/* dev_set_mac_addr() can be called by a master device on bridge's |
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* NETDEV_UNREGISTER, but since it's being destroyed do nothing |
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*/ |
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if (dev->reg_state != NETREG_REGISTERED) |
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return -EBUSY; |
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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 int br_get_link_ksettings(struct net_device *dev, |
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struct ethtool_link_ksettings *cmd) |
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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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cmd->base.duplex = DUPLEX_UNKNOWN; |
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cmd->base.port = PORT_OTHER; |
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cmd->base.speed = SPEED_UNKNOWN; |
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list_for_each_entry(p, &br->port_list, list) { |
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struct ethtool_link_ksettings ecmd; |
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struct net_device *pdev = p->dev; |
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if (!netif_running(pdev) || !netif_oper_up(pdev)) |
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continue; |
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if (__ethtool_get_link_ksettings(pdev, &ecmd)) |
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continue; |
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if (ecmd.base.speed == (__u32)SPEED_UNKNOWN) |
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continue; |
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if (cmd->base.speed == (__u32)SPEED_UNKNOWN || |
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cmd->base.speed < ecmd.base.speed) |
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cmd->base.speed = ecmd.base.speed; |
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} |
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return 0; |
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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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.get_link_ksettings = br_get_link_ksettings, |
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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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#if IS_ENABLED(CONFIG_BRIDGE_MRP) |
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INIT_LIST_HEAD(&br->mrp_list); |
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#endif |
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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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