777 lines
18 KiB
C
777 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Userspace interface
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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/etherdevice.h>
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#include <linux/netpoll.h>
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#include <linux/ethtool.h>
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#include <linux/if_arp.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_ether.h>
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#include <linux/slab.h>
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#include <net/dsa.h>
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#include <net/sock.h>
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#include <linux/if_vlan.h>
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#include <net/switchdev.h>
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#include <net/net_namespace.h>
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#include "br_private.h"
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/*
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* Determine initial path cost based on speed.
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* using recommendations from 802.1d standard
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*
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* Since driver might sleep need to not be holding any locks.
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*/
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static int port_cost(struct net_device *dev)
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{
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struct ethtool_link_ksettings ecmd;
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if (!__ethtool_get_link_ksettings(dev, &ecmd)) {
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switch (ecmd.base.speed) {
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case SPEED_10000:
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return 2;
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case SPEED_1000:
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return 4;
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case SPEED_100:
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return 19;
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case SPEED_10:
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return 100;
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}
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}
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/* Old silly heuristics based on name */
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if (!strncmp(dev->name, "lec", 3))
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return 7;
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if (!strncmp(dev->name, "plip", 4))
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return 2500;
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return 100; /* assume old 10Mbps */
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}
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/* Check for port carrier transitions. */
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void br_port_carrier_check(struct net_bridge_port *p, bool *notified)
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{
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struct net_device *dev = p->dev;
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struct net_bridge *br = p->br;
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if (!(p->flags & BR_ADMIN_COST) &&
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netif_running(dev) && netif_oper_up(dev))
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p->path_cost = port_cost(dev);
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*notified = false;
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if (!netif_running(br->dev))
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return;
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spin_lock_bh(&br->lock);
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if (netif_running(dev) && netif_oper_up(dev)) {
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if (p->state == BR_STATE_DISABLED) {
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br_stp_enable_port(p);
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*notified = true;
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}
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} else {
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if (p->state != BR_STATE_DISABLED) {
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br_stp_disable_port(p);
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*notified = true;
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}
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}
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spin_unlock_bh(&br->lock);
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}
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static void br_port_set_promisc(struct net_bridge_port *p)
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{
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int err = 0;
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if (br_promisc_port(p))
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return;
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err = dev_set_promiscuity(p->dev, 1);
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if (err)
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return;
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br_fdb_unsync_static(p->br, p);
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p->flags |= BR_PROMISC;
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}
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static void br_port_clear_promisc(struct net_bridge_port *p)
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{
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int err;
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/* Check if the port is already non-promisc or if it doesn't
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* support UNICAST filtering. Without unicast filtering support
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* we'll end up re-enabling promisc mode anyway, so just check for
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* it here.
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*/
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if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT))
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return;
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/* Since we'll be clearing the promisc mode, program the port
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* first so that we don't have interruption in traffic.
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*/
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err = br_fdb_sync_static(p->br, p);
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if (err)
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return;
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dev_set_promiscuity(p->dev, -1);
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p->flags &= ~BR_PROMISC;
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}
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/* When a port is added or removed or when certain port flags
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* change, this function is called to automatically manage
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* promiscuity setting of all the bridge ports. We are always called
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* under RTNL so can skip using rcu primitives.
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*/
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void br_manage_promisc(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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bool set_all = false;
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/* If vlan filtering is disabled or bridge interface is placed
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* into promiscuous mode, place all ports in promiscuous mode.
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*/
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if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br->dev))
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set_all = true;
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list_for_each_entry(p, &br->port_list, list) {
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if (set_all) {
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br_port_set_promisc(p);
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} else {
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/* If the number of auto-ports is <= 1, then all other
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* ports will have their output configuration
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* statically specified through fdbs. Since ingress
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* on the auto-port becomes forwarding/egress to other
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* ports and egress configuration is statically known,
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* we can say that ingress configuration of the
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* auto-port is also statically known.
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* This lets us disable promiscuous mode and write
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* this config to hw.
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*/
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if (br->auto_cnt == 0 ||
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(br->auto_cnt == 1 && br_auto_port(p)))
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br_port_clear_promisc(p);
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else
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br_port_set_promisc(p);
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}
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}
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}
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int nbp_backup_change(struct net_bridge_port *p,
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struct net_device *backup_dev)
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{
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struct net_bridge_port *old_backup = rtnl_dereference(p->backup_port);
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struct net_bridge_port *backup_p = NULL;
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ASSERT_RTNL();
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if (backup_dev) {
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if (!netif_is_bridge_port(backup_dev))
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return -ENOENT;
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backup_p = br_port_get_rtnl(backup_dev);
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if (backup_p->br != p->br)
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return -EINVAL;
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}
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if (p == backup_p)
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return -EINVAL;
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if (old_backup == backup_p)
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return 0;
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/* if the backup link is already set, clear it */
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if (old_backup)
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old_backup->backup_redirected_cnt--;
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if (backup_p)
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backup_p->backup_redirected_cnt++;
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rcu_assign_pointer(p->backup_port, backup_p);
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return 0;
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}
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static void nbp_backup_clear(struct net_bridge_port *p)
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{
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nbp_backup_change(p, NULL);
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if (p->backup_redirected_cnt) {
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struct net_bridge_port *cur_p;
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list_for_each_entry(cur_p, &p->br->port_list, list) {
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struct net_bridge_port *backup_p;
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backup_p = rtnl_dereference(cur_p->backup_port);
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if (backup_p == p)
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nbp_backup_change(cur_p, NULL);
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}
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}
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WARN_ON(rcu_access_pointer(p->backup_port) || p->backup_redirected_cnt);
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}
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static void nbp_update_port_count(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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u32 cnt = 0;
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list_for_each_entry(p, &br->port_list, list) {
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if (br_auto_port(p))
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cnt++;
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}
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if (br->auto_cnt != cnt) {
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br->auto_cnt = cnt;
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br_manage_promisc(br);
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}
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}
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static void nbp_delete_promisc(struct net_bridge_port *p)
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{
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/* If port is currently promiscuous, unset promiscuity.
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* Otherwise, it is a static port so remove all addresses
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* from it.
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*/
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dev_set_allmulti(p->dev, -1);
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if (br_promisc_port(p))
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dev_set_promiscuity(p->dev, -1);
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else
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br_fdb_unsync_static(p->br, p);
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}
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static void release_nbp(struct kobject *kobj)
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{
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struct net_bridge_port *p
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= container_of(kobj, struct net_bridge_port, kobj);
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kfree(p);
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}
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static void brport_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
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{
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struct net_bridge_port *p = kobj_to_brport(kobj);
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net_ns_get_ownership(dev_net(p->dev), uid, gid);
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}
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static struct kobj_type brport_ktype = {
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#ifdef CONFIG_SYSFS
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.sysfs_ops = &brport_sysfs_ops,
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#endif
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.release = release_nbp,
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.get_ownership = brport_get_ownership,
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};
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static void destroy_nbp(struct net_bridge_port *p)
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{
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struct net_device *dev = p->dev;
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p->br = NULL;
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p->dev = NULL;
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dev_put(dev);
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kobject_put(&p->kobj);
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}
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static void destroy_nbp_rcu(struct rcu_head *head)
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{
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struct net_bridge_port *p =
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container_of(head, struct net_bridge_port, rcu);
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destroy_nbp(p);
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}
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static unsigned get_max_headroom(struct net_bridge *br)
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{
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unsigned max_headroom = 0;
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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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unsigned dev_headroom = netdev_get_fwd_headroom(p->dev);
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if (dev_headroom > max_headroom)
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max_headroom = dev_headroom;
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}
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return max_headroom;
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}
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static void update_headroom(struct net_bridge *br, int new_hr)
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{
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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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netdev_set_rx_headroom(p->dev, new_hr);
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br->dev->needed_headroom = new_hr;
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}
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/* Delete port(interface) from bridge is done in two steps.
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* via RCU. First step, marks device as down. That deletes
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* all the timers and stops new packets from flowing through.
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*
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* Final cleanup doesn't occur until after all CPU's finished
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* processing packets.
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*
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* Protected from multiple admin operations by RTNL mutex
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*/
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static void del_nbp(struct net_bridge_port *p)
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{
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struct net_bridge *br = p->br;
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struct net_device *dev = p->dev;
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sysfs_remove_link(br->ifobj, p->dev->name);
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nbp_delete_promisc(p);
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spin_lock_bh(&br->lock);
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br_stp_disable_port(p);
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spin_unlock_bh(&br->lock);
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br_mrp_port_del(br, p);
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br_cfm_port_del(br, p);
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br_ifinfo_notify(RTM_DELLINK, NULL, p);
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list_del_rcu(&p->list);
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if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom)
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update_headroom(br, get_max_headroom(br));
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netdev_reset_rx_headroom(dev);
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nbp_vlan_flush(p);
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br_fdb_delete_by_port(br, p, 0, 1);
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switchdev_deferred_process();
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nbp_backup_clear(p);
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nbp_update_port_count(br);
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netdev_upper_dev_unlink(dev, br->dev);
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dev->priv_flags &= ~IFF_BRIDGE_PORT;
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netdev_rx_handler_unregister(dev);
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br_multicast_del_port(p);
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kobject_uevent(&p->kobj, KOBJ_REMOVE);
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kobject_del(&p->kobj);
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br_netpoll_disable(p);
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call_rcu(&p->rcu, destroy_nbp_rcu);
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}
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/* Delete bridge device */
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void br_dev_delete(struct net_device *dev, struct list_head *head)
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{
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struct net_bridge *br = netdev_priv(dev);
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struct net_bridge_port *p, *n;
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list_for_each_entry_safe(p, n, &br->port_list, list) {
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del_nbp(p);
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}
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br_recalculate_neigh_suppress_enabled(br);
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br_fdb_delete_by_port(br, NULL, 0, 1);
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cancel_delayed_work_sync(&br->gc_work);
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br_sysfs_delbr(br->dev);
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unregister_netdevice_queue(br->dev, head);
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}
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/* find an available port number */
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static int find_portno(struct net_bridge *br)
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{
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int index;
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struct net_bridge_port *p;
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unsigned long *inuse;
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inuse = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
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if (!inuse)
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return -ENOMEM;
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set_bit(0, inuse); /* zero is reserved */
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list_for_each_entry(p, &br->port_list, list) {
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set_bit(p->port_no, inuse);
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}
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index = find_first_zero_bit(inuse, BR_MAX_PORTS);
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bitmap_free(inuse);
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return (index >= BR_MAX_PORTS) ? -EXFULL : index;
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}
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/* called with RTNL but without bridge lock */
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static struct net_bridge_port *new_nbp(struct net_bridge *br,
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struct net_device *dev)
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{
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struct net_bridge_port *p;
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int index, err;
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index = find_portno(br);
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if (index < 0)
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return ERR_PTR(index);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return ERR_PTR(-ENOMEM);
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p->br = br;
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dev_hold(dev);
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p->dev = dev;
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p->path_cost = port_cost(dev);
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p->priority = 0x8000 >> BR_PORT_BITS;
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p->port_no = index;
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p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
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br_init_port(p);
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br_set_state(p, BR_STATE_DISABLED);
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br_stp_port_timer_init(p);
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err = br_multicast_add_port(p);
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if (err) {
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dev_put(dev);
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kfree(p);
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p = ERR_PTR(err);
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}
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return p;
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}
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int br_add_bridge(struct net *net, const char *name)
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{
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struct net_device *dev;
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int res;
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dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN,
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br_dev_setup);
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if (!dev)
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return -ENOMEM;
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dev_net_set(dev, net);
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dev->rtnl_link_ops = &br_link_ops;
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res = register_netdev(dev);
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if (res)
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free_netdev(dev);
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return res;
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}
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int br_del_bridge(struct net *net, const char *name)
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{
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struct net_device *dev;
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int ret = 0;
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rtnl_lock();
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dev = __dev_get_by_name(net, name);
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if (dev == NULL)
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ret = -ENXIO; /* Could not find device */
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else if (!(dev->priv_flags & IFF_EBRIDGE)) {
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/* Attempt to delete non bridge device! */
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ret = -EPERM;
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}
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else if (dev->flags & IFF_UP) {
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/* Not shutdown yet. */
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ret = -EBUSY;
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}
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else
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br_dev_delete(dev, NULL);
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rtnl_unlock();
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return ret;
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}
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/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
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static int br_mtu_min(const struct net_bridge *br)
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{
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const struct net_bridge_port *p;
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int ret_mtu = 0;
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list_for_each_entry(p, &br->port_list, list)
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if (!ret_mtu || ret_mtu > p->dev->mtu)
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ret_mtu = p->dev->mtu;
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return ret_mtu ? ret_mtu : ETH_DATA_LEN;
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}
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void br_mtu_auto_adjust(struct net_bridge *br)
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{
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ASSERT_RTNL();
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/* if the bridge MTU was manually configured don't mess with it */
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if (br_opt_get(br, BROPT_MTU_SET_BY_USER))
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return;
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/* change to the minimum MTU and clear the flag which was set by
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* the bridge ndo_change_mtu callback
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*/
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dev_set_mtu(br->dev, br_mtu_min(br));
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br_opt_toggle(br, BROPT_MTU_SET_BY_USER, false);
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}
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static void br_set_gso_limits(struct net_bridge *br)
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{
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unsigned int gso_max_size = GSO_MAX_SIZE;
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u16 gso_max_segs = GSO_MAX_SEGS;
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const struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list) {
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gso_max_size = min(gso_max_size, p->dev->gso_max_size);
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gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs);
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}
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br->dev->gso_max_size = gso_max_size;
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br->dev->gso_max_segs = gso_max_segs;
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}
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/*
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* Recomputes features using slave's features
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*/
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netdev_features_t br_features_recompute(struct net_bridge *br,
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|
netdev_features_t features)
|
|
{
|
|
struct net_bridge_port *p;
|
|
netdev_features_t mask;
|
|
|
|
if (list_empty(&br->port_list))
|
|
return features;
|
|
|
|
mask = features;
|
|
features &= ~NETIF_F_ONE_FOR_ALL;
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
features = netdev_increment_features(features,
|
|
p->dev->features, mask);
|
|
}
|
|
features = netdev_add_tso_features(features, mask);
|
|
|
|
return features;
|
|
}
|
|
|
|
/* called with RTNL */
|
|
int br_add_if(struct net_bridge *br, struct net_device *dev,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_bridge_port *p;
|
|
int err = 0;
|
|
unsigned br_hr, dev_hr;
|
|
bool changed_addr;
|
|
|
|
/* Don't allow bridging non-ethernet like devices. */
|
|
if ((dev->flags & IFF_LOOPBACK) ||
|
|
dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN ||
|
|
!is_valid_ether_addr(dev->dev_addr))
|
|
return -EINVAL;
|
|
|
|
/* Also don't allow bridging of net devices that are DSA masters, since
|
|
* the bridge layer rx_handler prevents the DSA fake ethertype handler
|
|
* to be invoked, so we don't get the chance to strip off and parse the
|
|
* DSA switch tag protocol header (the bridge layer just returns
|
|
* RX_HANDLER_CONSUMED, stopping RX processing for these frames).
|
|
* The only case where that would not be an issue is when bridging can
|
|
* already be offloaded, such as when the DSA master is itself a DSA
|
|
* or plain switchdev port, and is bridged only with other ports from
|
|
* the same hardware device.
|
|
*/
|
|
if (netdev_uses_dsa(dev)) {
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
if (!netdev_port_same_parent_id(dev, p->dev)) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Cannot do software bridging with a DSA master");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No bridging of bridges */
|
|
if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Can not enslave a bridge to a bridge");
|
|
return -ELOOP;
|
|
}
|
|
|
|
/* Device has master upper dev */
|
|
if (netdev_master_upper_dev_get(dev))
|
|
return -EBUSY;
|
|
|
|
/* No bridging devices that dislike that (e.g. wireless) */
|
|
if (dev->priv_flags & IFF_DONT_BRIDGE) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Device does not allow enslaving to a bridge");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
p = new_nbp(br, dev);
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
|
|
call_netdevice_notifiers(NETDEV_JOIN, dev);
|
|
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
kfree(p); /* kobject not yet init'd, manually free */
|
|
goto err1;
|
|
}
|
|
|
|
err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
|
|
SYSFS_BRIDGE_PORT_ATTR);
|
|
if (err)
|
|
goto err2;
|
|
|
|
err = br_sysfs_addif(p);
|
|
if (err)
|
|
goto err2;
|
|
|
|
err = br_netpoll_enable(p);
|
|
if (err)
|
|
goto err3;
|
|
|
|
err = netdev_rx_handler_register(dev, br_get_rx_handler(dev), p);
|
|
if (err)
|
|
goto err4;
|
|
|
|
dev->priv_flags |= IFF_BRIDGE_PORT;
|
|
|
|
err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL, extack);
|
|
if (err)
|
|
goto err5;
|
|
|
|
err = nbp_switchdev_mark_set(p);
|
|
if (err)
|
|
goto err6;
|
|
|
|
dev_disable_lro(dev);
|
|
|
|
list_add_rcu(&p->list, &br->port_list);
|
|
|
|
nbp_update_port_count(br);
|
|
|
|
netdev_update_features(br->dev);
|
|
|
|
br_hr = br->dev->needed_headroom;
|
|
dev_hr = netdev_get_fwd_headroom(dev);
|
|
if (br_hr < dev_hr)
|
|
update_headroom(br, dev_hr);
|
|
else
|
|
netdev_set_rx_headroom(dev, br_hr);
|
|
|
|
if (br_fdb_insert(br, p, dev->dev_addr, 0))
|
|
netdev_err(dev, "failed insert local address bridge forwarding table\n");
|
|
|
|
if (br->dev->addr_assign_type != NET_ADDR_SET) {
|
|
/* Ask for permission to use this MAC address now, even if we
|
|
* don't end up choosing it below.
|
|
*/
|
|
err = dev_pre_changeaddr_notify(br->dev, dev->dev_addr, extack);
|
|
if (err)
|
|
goto err7;
|
|
}
|
|
|
|
err = nbp_vlan_init(p, extack);
|
|
if (err) {
|
|
netdev_err(dev, "failed to initialize vlan filtering on this port\n");
|
|
goto err7;
|
|
}
|
|
|
|
spin_lock_bh(&br->lock);
|
|
changed_addr = br_stp_recalculate_bridge_id(br);
|
|
|
|
if (netif_running(dev) && netif_oper_up(dev) &&
|
|
(br->dev->flags & IFF_UP))
|
|
br_stp_enable_port(p);
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
br_ifinfo_notify(RTM_NEWLINK, NULL, p);
|
|
|
|
if (changed_addr)
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
|
|
|
|
br_mtu_auto_adjust(br);
|
|
br_set_gso_limits(br);
|
|
|
|
kobject_uevent(&p->kobj, KOBJ_ADD);
|
|
|
|
return 0;
|
|
|
|
err7:
|
|
list_del_rcu(&p->list);
|
|
br_fdb_delete_by_port(br, p, 0, 1);
|
|
nbp_update_port_count(br);
|
|
err6:
|
|
netdev_upper_dev_unlink(dev, br->dev);
|
|
err5:
|
|
dev->priv_flags &= ~IFF_BRIDGE_PORT;
|
|
netdev_rx_handler_unregister(dev);
|
|
err4:
|
|
br_netpoll_disable(p);
|
|
err3:
|
|
sysfs_remove_link(br->ifobj, p->dev->name);
|
|
err2:
|
|
kobject_put(&p->kobj);
|
|
dev_set_allmulti(dev, -1);
|
|
err1:
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
|
|
/* called with RTNL */
|
|
int br_del_if(struct net_bridge *br, struct net_device *dev)
|
|
{
|
|
struct net_bridge_port *p;
|
|
bool changed_addr;
|
|
|
|
p = br_port_get_rtnl(dev);
|
|
if (!p || p->br != br)
|
|
return -EINVAL;
|
|
|
|
/* Since more than one interface can be attached to a bridge,
|
|
* there still maybe an alternate path for netconsole to use;
|
|
* therefore there is no reason for a NETDEV_RELEASE event.
|
|
*/
|
|
del_nbp(p);
|
|
|
|
br_mtu_auto_adjust(br);
|
|
br_set_gso_limits(br);
|
|
|
|
spin_lock_bh(&br->lock);
|
|
changed_addr = br_stp_recalculate_bridge_id(br);
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
if (changed_addr)
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
|
|
|
|
netdev_update_features(br->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void br_port_flags_change(struct net_bridge_port *p, unsigned long mask)
|
|
{
|
|
struct net_bridge *br = p->br;
|
|
|
|
if (mask & BR_AUTO_MASK)
|
|
nbp_update_port_count(br);
|
|
|
|
if (mask & BR_NEIGH_SUPPRESS)
|
|
br_recalculate_neigh_suppress_enabled(br);
|
|
}
|
|
|
|
bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag)
|
|
{
|
|
struct net_bridge_port *p;
|
|
|
|
p = br_port_get_rtnl_rcu(dev);
|
|
if (!p)
|
|
return false;
|
|
|
|
return p->flags & flag;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_port_flag_is_set);
|