578 lines
12 KiB
C
Executable File
578 lines
12 KiB
C
Executable File
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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/sock.h>
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#include <linux/if_vlan.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_cmd ecmd;
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if (!__ethtool_get_settings(dev, &ecmd)) {
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switch (ethtool_cmd_speed(&ecmd)) {
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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)
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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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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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} else {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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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))
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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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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 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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};
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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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/* 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_ifinfo_notify(RTM_DELLINK, p);
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list_del_rcu(&p->list);
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nbp_vlan_flush(p);
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br_fdb_delete_by_port(br, p, 1);
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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_fdb_delete_by_port(br, NULL, 1);
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br_vlan_flush(br);
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del_timer_sync(&br->gc_timer);
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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 = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
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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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kfree(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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int index;
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struct net_bridge_port *p;
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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;
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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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br_multicast_add_port(p);
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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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int br_min_mtu(const struct net_bridge *br)
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{
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const struct net_bridge_port *p;
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int mtu = 0;
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ASSERT_RTNL();
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if (list_empty(&br->port_list))
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mtu = ETH_DATA_LEN;
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else {
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list_for_each_entry(p, &br->port_list, list) {
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if (!mtu || p->dev->mtu < mtu)
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mtu = p->dev->mtu;
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}
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}
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return mtu;
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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)
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{
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struct net_bridge_port *p;
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netdev_features_t mask;
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if (list_empty(&br->port_list))
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return features;
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mask = features;
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features &= ~NETIF_F_ONE_FOR_ALL;
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list_for_each_entry(p, &br->port_list, list) {
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features = netdev_increment_features(features,
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p->dev->features, mask);
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}
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return features;
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}
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/* called with RTNL */
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int br_add_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p;
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int err = 0;
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bool changed_addr;
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/* Don't allow bridging non-ethernet like devices */
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if ((dev->flags & IFF_LOOPBACK) ||
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dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN ||
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!is_valid_ether_addr(dev->dev_addr))
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return -EINVAL;
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/* No bridging of bridges */
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if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
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return -ELOOP;
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/* Device is already being bridged */
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if (br_port_exists(dev))
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return -EBUSY;
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/* No bridging devices that dislike that (e.g. wireless) */
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if (dev->priv_flags & IFF_DONT_BRIDGE)
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return -EOPNOTSUPP;
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p = new_nbp(br, dev);
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if (IS_ERR(p))
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return PTR_ERR(p);
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call_netdevice_notifiers(NETDEV_JOIN, dev);
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err = dev_set_allmulti(dev, 1);
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if (err)
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goto put_back;
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err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
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SYSFS_BRIDGE_PORT_ATTR);
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if (err)
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goto err1;
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err = br_sysfs_addif(p);
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if (err)
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goto err2;
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err = br_netpoll_enable(p);
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if (err)
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goto err3;
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err = netdev_rx_handler_register(dev, br_handle_frame, p);
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if (err)
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goto err4;
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dev->priv_flags |= IFF_BRIDGE_PORT;
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err = netdev_master_upper_dev_link(dev, br->dev);
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if (err)
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goto err5;
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dev_disable_lro(dev);
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list_add_rcu(&p->list, &br->port_list);
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nbp_update_port_count(br);
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netdev_update_features(br->dev);
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if (br->dev->needed_headroom < dev->needed_headroom)
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br->dev->needed_headroom = dev->needed_headroom;
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if (br_fdb_insert(br, p, dev->dev_addr, 0))
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netdev_err(dev, "failed insert local address bridge forwarding table\n");
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if (nbp_vlan_init(p))
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netdev_err(dev, "failed to initialize vlan filtering on this port\n");
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spin_lock_bh(&br->lock);
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changed_addr = br_stp_recalculate_bridge_id(br);
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if (netif_running(dev) && netif_oper_up(dev) &&
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(br->dev->flags & IFF_UP))
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br_stp_enable_port(p);
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spin_unlock_bh(&br->lock);
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br_ifinfo_notify(RTM_NEWLINK, p);
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if (changed_addr)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
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dev_set_mtu(br->dev, br_min_mtu(br));
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kobject_uevent(&p->kobj, KOBJ_ADD);
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return 0;
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err5:
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dev->priv_flags &= ~IFF_BRIDGE_PORT;
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netdev_rx_handler_unregister(dev);
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err4:
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br_netpoll_disable(p);
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err3:
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sysfs_remove_link(br->ifobj, p->dev->name);
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err2:
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kobject_put(&p->kobj);
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p = NULL; /* kobject_put frees */
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err1:
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dev_set_allmulti(dev, -1);
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put_back:
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dev_put(dev);
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kfree(p);
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return err;
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}
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/* called with RTNL */
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int br_del_if(struct net_bridge *br, struct net_device *dev)
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{
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struct net_bridge_port *p;
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bool changed_addr;
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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);
|
|
|
|
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);
|
|
}
|