![Eric W. Biederman](/assets/img/avatar_default.png)
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
453 lines
9 KiB
C
453 lines
9 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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* $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
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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/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 <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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if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
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struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
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if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
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switch(ecmd.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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}
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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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/*
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* Check for port carrier transistions.
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* Called from work queue to allow for calling functions that
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* might sleep (such as speed check), and to debounce.
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*/
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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_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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spin_lock_bh(&br->lock);
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if (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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}
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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, 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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rcu_assign_pointer(dev->br_port, NULL);
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kobject_uevent(&p->kobj, KOBJ_REMOVE);
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kobject_del(&p->kobj);
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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)
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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(br->dev);
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}
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static struct net_device *new_bridge_dev(const char *name)
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{
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struct net_bridge *br;
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struct net_device *dev;
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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 NULL;
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br = netdev_priv(dev);
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br->dev = dev;
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spin_lock_init(&br->lock);
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INIT_LIST_HEAD(&br->port_list);
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spin_lock_init(&br->hash_lock);
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br->bridge_id.prio[0] = 0x80;
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br->bridge_id.prio[1] = 0x00;
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memcpy(br->group_addr, br_group_address, ETH_ALEN);
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br->feature_mask = dev->features;
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br->stp_enabled = BR_NO_STP;
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br->designated_root = br->bridge_id;
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br->root_path_cost = 0;
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br->root_port = 0;
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br->bridge_max_age = br->max_age = 20 * HZ;
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br->bridge_hello_time = br->hello_time = 2 * HZ;
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br->bridge_forward_delay = br->forward_delay = 15 * HZ;
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br->topology_change = 0;
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br->topology_change_detected = 0;
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br->ageing_time = 300 * HZ;
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INIT_LIST_HEAD(&br->age_list);
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br_stp_timer_init(br);
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return dev;
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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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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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kobject_init(&p->kobj);
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kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
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p->kobj.ktype = &brport_ktype;
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p->kobj.parent = &(dev->dev.kobj);
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p->kobj.kset = NULL;
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return p;
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}
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int br_add_bridge(const char *name)
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{
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struct net_device *dev;
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int ret;
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dev = new_bridge_dev(name);
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if (!dev)
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return -ENOMEM;
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rtnl_lock();
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if (strchr(dev->name, '%')) {
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ret = dev_alloc_name(dev, dev->name);
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if (ret < 0) {
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free_netdev(dev);
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goto out;
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}
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}
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ret = register_netdevice(dev);
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if (ret)
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goto out;
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ret = br_sysfs_addbr(dev);
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if (ret)
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unregister_netdevice(dev);
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out:
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rtnl_unlock();
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return ret;
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}
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int br_del_bridge(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(&init_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));
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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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void br_features_recompute(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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unsigned long features;
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features = br->feature_mask;
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list_for_each_entry(p, &br->port_list, list) {
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features = netdev_compute_features(features, p->dev->features);
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}
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br->dev->features = 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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if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
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return -EINVAL;
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if (dev->hard_start_xmit == br_dev_xmit)
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return -ELOOP;
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if (dev->br_port != NULL)
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return -EBUSY;
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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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err = kobject_add(&p->kobj);
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if (err)
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goto err0;
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err = br_fdb_insert(br, p, dev->dev_addr);
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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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rcu_assign_pointer(dev->br_port, p);
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dev_set_promiscuity(dev, 1);
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list_add_rcu(&p->list, &br->port_list);
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spin_lock_bh(&br->lock);
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br_stp_recalculate_bridge_id(br);
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br_features_recompute(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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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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err2:
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br_fdb_delete_by_port(br, p, 1);
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err1:
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kobject_del(&p->kobj);
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err0:
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kobject_put(&p->kobj);
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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 = dev->br_port;
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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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br_stp_recalculate_bridge_id(br);
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br_features_recompute(br);
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spin_unlock_bh(&br->lock);
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return 0;
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}
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void __exit br_cleanup_bridges(void)
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{
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struct net_device *dev, *nxt;
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rtnl_lock();
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for_each_netdev_safe(&init_net, dev, nxt)
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if (dev->priv_flags & IFF_EBRIDGE)
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del_br(dev->priv);
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rtnl_unlock();
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}
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