linux/drivers/net/macvlan.c

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/*
* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* The code this is based on carried the following copyright notice:
* ---
* (C) Copyright 2001-2006
* Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
* Re-worked by Ben Greear <greearb@candelatech.com>
* ---
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_arp.h>
#include <linux/if_link.h>
#include <linux/if_macvlan.h>
#include <net/rtnetlink.h>
#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
struct macvlan_port {
struct net_device *dev;
struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
struct list_head vlans;
};
struct macvlan_dev {
struct net_device *dev;
struct list_head list;
struct hlist_node hlist;
struct macvlan_port *port;
struct net_device *lowerdev;
};
static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
const unsigned char *addr)
{
struct macvlan_dev *vlan;
struct hlist_node *n;
hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
if (!compare_ether_addr(vlan->dev->dev_addr, addr))
return vlan;
}
return NULL;
}
static void macvlan_broadcast(struct sk_buff *skb,
const struct macvlan_port *port)
{
const struct ethhdr *eth = eth_hdr(skb);
const struct macvlan_dev *vlan;
struct hlist_node *n;
struct net_device *dev;
struct sk_buff *nskb;
unsigned int i;
for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
dev = vlan->dev;
nskb = skb_clone(skb, GFP_ATOMIC);
if (nskb == NULL) {
dev->stats.rx_errors++;
dev->stats.rx_dropped++;
continue;
}
dev->stats.rx_bytes += skb->len + ETH_HLEN;
dev->stats.rx_packets++;
dev->stats.multicast++;
dev->last_rx = jiffies;
nskb->dev = dev;
if (!compare_ether_addr(eth->h_dest, dev->broadcast))
nskb->pkt_type = PACKET_BROADCAST;
else
nskb->pkt_type = PACKET_MULTICAST;
netif_rx(nskb);
}
}
}
/* called under rcu_read_lock() from netif_receive_skb */
static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
{
const struct ethhdr *eth = eth_hdr(skb);
const struct macvlan_port *port;
const struct macvlan_dev *vlan;
struct net_device *dev;
port = rcu_dereference(skb->dev->macvlan_port);
if (port == NULL)
return skb;
if (is_multicast_ether_addr(eth->h_dest)) {
macvlan_broadcast(skb, port);
return skb;
}
vlan = macvlan_hash_lookup(port, eth->h_dest);
if (vlan == NULL)
return skb;
dev = vlan->dev;
if (unlikely(!(dev->flags & IFF_UP))) {
kfree_skb(skb);
return NULL;
}
skb = skb_share_check(skb, GFP_ATOMIC);
if (skb == NULL) {
dev->stats.rx_errors++;
dev->stats.rx_dropped++;
return NULL;
}
dev->stats.rx_bytes += skb->len + ETH_HLEN;
dev->stats.rx_packets++;
dev->last_rx = jiffies;
skb->dev = dev;
skb->pkt_type = PACKET_HOST;
netif_rx(skb);
return NULL;
}
static int macvlan_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
const struct macvlan_dev *vlan = netdev_priv(dev);
unsigned int len = skb->len;
int ret;
skb->dev = vlan->lowerdev;
ret = dev_queue_xmit(skb);
if (likely(ret == NET_XMIT_SUCCESS)) {
dev->stats.tx_packets++;
dev->stats.tx_bytes += len;
} else {
dev->stats.tx_errors++;
dev->stats.tx_aborted_errors++;
}
return NETDEV_TX_OK;
}
static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, const void *daddr,
const void *saddr, unsigned len)
{
const struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
return dev_hard_header(skb, lowerdev, type, daddr,
saddr ? : dev->dev_addr, len);
}
static const struct header_ops macvlan_hard_header_ops = {
.create = macvlan_hard_header,
.rebuild = eth_rebuild_header,
.parse = eth_header_parse,
.cache = eth_header_cache,
.cache_update = eth_header_cache_update,
};
static int macvlan_open(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port = vlan->port;
struct net_device *lowerdev = vlan->lowerdev;
int err;
err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
if (err < 0)
return err;
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(lowerdev, 1);
hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
return 0;
}
static int macvlan_stop(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
dev_mc_unsync(lowerdev, dev);
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(lowerdev, -1);
dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
hlist_del_rcu(&vlan->hlist);
synchronize_rcu();
return 0;
}
static int macvlan_set_mac_address(struct net_device *dev, void *p)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
struct sockaddr *addr = p;
int err;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (!(dev->flags & IFF_UP))
goto out;
err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
if (err < 0)
return err;
dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
out:
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
return 0;
}
static void macvlan_change_rx_flags(struct net_device *dev, int change)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
if (change & IFF_ALLMULTI)
dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
}
static void macvlan_set_multicast_list(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
dev_mc_sync(vlan->lowerdev, dev);
}
static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
{
struct macvlan_dev *vlan = netdev_priv(dev);
if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
/*
* macvlan network devices have devices nesting below it and are a special
* "super class" of normal network devices; split their locks off into a
* separate class since they always nest.
*/
static struct lock_class_key macvlan_netdev_xmit_lock_key;
#define MACVLAN_FEATURES \
(NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
NETIF_F_TSO_ECN | NETIF_F_TSO6)
#define MACVLAN_STATE_MASK \
((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
static int macvlan_init(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
const struct net_device *lowerdev = vlan->lowerdev;
dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
(lowerdev->state & MACVLAN_STATE_MASK);
dev->features = lowerdev->features & MACVLAN_FEATURES;
dev->iflink = lowerdev->ifindex;
lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key);
return 0;
}
static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *drvinfo)
{
snprintf(drvinfo->driver, 32, "macvlan");
snprintf(drvinfo->version, 32, "0.1");
}
static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
{
const struct macvlan_dev *vlan = netdev_priv(dev);
struct net_device *lowerdev = vlan->lowerdev;
if (lowerdev->ethtool_ops->get_rx_csum == NULL)
return 0;
return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
}
static const struct ethtool_ops macvlan_ethtool_ops = {
.get_link = ethtool_op_get_link,
.get_rx_csum = macvlan_ethtool_get_rx_csum,
.get_drvinfo = macvlan_ethtool_get_drvinfo,
};
static void macvlan_setup(struct net_device *dev)
{
ether_setup(dev);
dev->init = macvlan_init;
dev->open = macvlan_open;
dev->stop = macvlan_stop;
dev->change_mtu = macvlan_change_mtu;
dev->change_rx_flags = macvlan_change_rx_flags;
dev->set_mac_address = macvlan_set_mac_address;
dev->set_multicast_list = macvlan_set_multicast_list;
dev->hard_start_xmit = macvlan_hard_start_xmit;
dev->destructor = free_netdev;
dev->header_ops = &macvlan_hard_header_ops,
dev->ethtool_ops = &macvlan_ethtool_ops;
dev->tx_queue_len = 0;
}
static int macvlan_port_create(struct net_device *dev)
{
struct macvlan_port *port;
unsigned int i;
if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
return -EINVAL;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (port == NULL)
return -ENOMEM;
port->dev = dev;
INIT_LIST_HEAD(&port->vlans);
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
INIT_HLIST_HEAD(&port->vlan_hash[i]);
rcu_assign_pointer(dev->macvlan_port, port);
return 0;
}
static void macvlan_port_destroy(struct net_device *dev)
{
struct macvlan_port *port = dev->macvlan_port;
rcu_assign_pointer(dev->macvlan_port, NULL);
synchronize_rcu();
kfree(port);
}
static void macvlan_transfer_operstate(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
const struct net_device *lowerdev = vlan->lowerdev;
if (lowerdev->operstate == IF_OPER_DORMANT)
netif_dormant_on(dev);
else
netif_dormant_off(dev);
if (netif_carrier_ok(lowerdev)) {
if (!netif_carrier_ok(dev))
netif_carrier_on(dev);
} else {
if (netif_carrier_ok(dev))
netif_carrier_off(dev);
}
}
static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
return -EINVAL;
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
return -EADDRNOTAVAIL;
}
return 0;
}
static int macvlan_newlink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port;
struct net_device *lowerdev;
int err;
if (!tb[IFLA_LINK])
return -EINVAL;
[NET]: Make the device list and device lookups per namespace. 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>
2007-09-17 18:56:21 +00:00
lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK]));
if (lowerdev == NULL)
return -ENODEV;
/* Don't allow macvlans on top of other macvlans - its not really
* wrong, but lockdep can't handle it and its not useful for anything
* you couldn't do directly on top of the real device.
*/
if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
return -ENODEV;
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu;
else if (dev->mtu > lowerdev->mtu)
return -EINVAL;
if (!tb[IFLA_ADDRESS])
random_ether_addr(dev->dev_addr);
if (lowerdev->macvlan_port == NULL) {
err = macvlan_port_create(lowerdev);
if (err < 0)
return err;
}
port = lowerdev->macvlan_port;
vlan->lowerdev = lowerdev;
vlan->dev = dev;
vlan->port = port;
err = register_netdevice(dev);
if (err < 0)
return err;
list_add_tail(&vlan->list, &port->vlans);
macvlan_transfer_operstate(dev);
return 0;
}
static void macvlan_dellink(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvlan_port *port = vlan->port;
list_del(&vlan->list);
unregister_netdevice(dev);
if (list_empty(&port->vlans))
macvlan_port_destroy(dev);
}
static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
.kind = "macvlan",
.priv_size = sizeof(struct macvlan_dev),
.setup = macvlan_setup,
.validate = macvlan_validate,
.newlink = macvlan_newlink,
.dellink = macvlan_dellink,
};
static int macvlan_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
struct macvlan_dev *vlan, *next;
struct macvlan_port *port;
port = dev->macvlan_port;
if (port == NULL)
return NOTIFY_DONE;
switch (event) {
case NETDEV_CHANGE:
list_for_each_entry(vlan, &port->vlans, list)
macvlan_transfer_operstate(vlan->dev);
break;
case NETDEV_FEAT_CHANGE:
list_for_each_entry(vlan, &port->vlans, list) {
vlan->dev->features = dev->features & MACVLAN_FEATURES;
netdev_features_change(vlan->dev);
}
break;
case NETDEV_UNREGISTER:
list_for_each_entry_safe(vlan, next, &port->vlans, list)
macvlan_dellink(vlan->dev);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block macvlan_notifier_block __read_mostly = {
.notifier_call = macvlan_device_event,
};
static int __init macvlan_init_module(void)
{
int err;
register_netdevice_notifier(&macvlan_notifier_block);
macvlan_handle_frame_hook = macvlan_handle_frame;
err = rtnl_link_register(&macvlan_link_ops);
if (err < 0)
goto err1;
return 0;
err1:
macvlan_handle_frame_hook = macvlan_handle_frame;
unregister_netdevice_notifier(&macvlan_notifier_block);
return err;
}
static void __exit macvlan_cleanup_module(void)
{
rtnl_link_unregister(&macvlan_link_ops);
macvlan_handle_frame_hook = NULL;
unregister_netdevice_notifier(&macvlan_notifier_block);
}
module_init(macvlan_init_module);
module_exit(macvlan_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_DESCRIPTION("Driver for MAC address based VLANs");
MODULE_ALIAS_RTNL_LINK("macvlan");