When port is added to a bridge, the old code would send the new neighbor netlink message before the subsequent new link message. This bug makes it difficult to use the monitoring API in an application. This code changes the ordering to add the forwarding entry after the port is setup. One of the error checks (for invalid address) is moved earlier in the process to avoid having to do unwind. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
454 lines
9.1 KiB
C
454 lines
9.1 KiB
C
/*
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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 "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 transistions. */
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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 (netif_running(dev) && netif_carrier_ok(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_carrier_ok(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 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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dev_set_promiscuity(dev, -1);
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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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br_fdb_delete_by_port(br, p, 1);
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list_del_rcu(&p->list);
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dev->priv_flags &= ~IFF_BRIDGE_PORT;
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netdev_rx_handler_unregister(dev);
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synchronize_net();
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netdev_set_master(dev, NULL);
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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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/* called with RTNL */
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static void del_br(struct net_bridge *br, struct list_head *head)
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{
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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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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 = 0;
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br_init_port(p);
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p->state = 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,
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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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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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del_br(netdev_priv(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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u32 br_features_recompute(struct net_bridge *br, u32 features)
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{
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struct net_bridge_port *p;
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u32 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_promiscuity(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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if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
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goto err3;
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err = netdev_set_master(dev, br->dev);
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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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dev_disable_lro(dev);
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list_add_rcu(&p->list, &br->port_list);
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netdev_update_features(br->dev);
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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 ((dev->flags & IFF_UP) && netif_carrier_ok(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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if (br_fdb_insert(br, p, dev->dev_addr))
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netdev_err(dev, "failed insert local address bridge forwarding table\n");
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kobject_uevent(&p->kobj, KOBJ_ADD);
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return 0;
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err4:
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netdev_set_master(dev, NULL);
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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_promiscuity(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);
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if (!p || p->br != br)
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return -EINVAL;
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del_nbp(p);
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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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spin_unlock_bh(&br->lock);
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if (changed_addr)
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call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
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netdev_update_features(br->dev);
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return 0;
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}
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void __net_exit br_net_exit(struct net *net)
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{
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struct net_device *dev;
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LIST_HEAD(list);
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rtnl_lock();
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for_each_netdev(net, dev)
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if (dev->priv_flags & IFF_EBRIDGE)
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del_br(netdev_priv(dev), &list);
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unregister_netdevice_many(&list);
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rtnl_unlock();
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}
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