linux/drivers/net/macvlan.c

530 lines
13 KiB
C

/*
* 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;
lowerdev = __dev_get_by_index(dev_net(dev), 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(port->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 = NULL;
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");