* [NET 02/02]: Add MACVLAN driver
2007-06-19 13:08 [NET 00/02]: MACVLAN driver Patrick McHardy
2007-06-19 13:08 ` [ETHERNET 01/02]: Validate new address in eth_mac_addr Patrick McHardy
@ 2007-06-19 13:08 ` Patrick McHardy
2007-06-19 16:00 ` [NET 00/02]: " Stephen Hemminger
2 siblings, 0 replies; 12+ messages in thread
From: Patrick McHardy @ 2007-06-19 13:08 UTC (permalink / raw)
To: davem; +Cc: netdev, Patrick McHardy
[NET]: Add MACVLAN driver
Add macvlan driver, which allows to create virtual ethernet devices
based on MAC address.
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
commit 890e2ae4ef5599ee34f280af4882f97c2dcfcb7b
tree a41a8564a8add18a2095a18d4a3f1a2ce0c25997
parent c92ac42cd3badaf120e97223ac4798abf5226424
author Patrick McHardy <kaber@trash.net> Tue, 19 Jun 2007 15:01:06 +0200
committer Patrick McHardy <kaber@trash.net> Tue, 19 Jun 2007 15:01:06 +0200
MAINTAINERS | 6 +
drivers/net/Kconfig | 10 +
drivers/net/Makefile | 1
drivers/net/macvlan.c | 468 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/if_macvlan.h | 9 +
include/linux/netdevice.h | 2
net/core/dev.c | 26 ++
7 files changed, 522 insertions(+), 0 deletions(-)
diff --git a/MAINTAINERS b/MAINTAINERS
index 4c715a7..7d61360 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2320,6 +2320,12 @@ W: http://linuxwireless.org/
T: git kernel.org:/pub/scm/linux/kernel/git/jbenc/mac80211.git
S: Maintained
+MACVLAN DRIVER
+P: Patrick McHardy
+M: kaber@trash.net
+L: netdev@vger.kernel.org
+S: Maintained
+
MARVELL YUKON / SYSKONNECT DRIVER
P: Mirko Lindner
M: mlindner@syskonnect.de
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 7d57f4a..6c3c1f0 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -77,6 +77,16 @@ config BONDING
To compile this driver as a module, choose M here: the module
will be called bonding.
+config MACVLAN
+ tristate "MAC-VLAN support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ ---help---
+ This allows one to create virtual interfaces that map packets to
+ or from specific MAC addresses to a particular interface.
+
+ To compile this driver as a module, choose M here: the module
+ will be called macvlan.
+
config EQUALIZER
tristate "EQL (serial line load balancing) support"
---help---
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a77affa..fc10e37 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -125,6 +125,7 @@ obj-$(CONFIG_SLHC) += slhc.o
obj-$(CONFIG_DUMMY) += dummy.o
obj-$(CONFIG_IFB) += ifb.o
+obj-$(CONFIG_MACVLAN) += macvlan.o
obj-$(CONFIG_DE600) += de600.o
obj-$(CONFIG_DE620) += de620.o
obj-$(CONFIG_LANCE) += lance.o
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
new file mode 100644
index 0000000..39ca0a2
--- /dev/null
+++ b/drivers/net/macvlan.c
@@ -0,0 +1,468 @@
+/*
+ * 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 list_head list;
+ 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;
+ if (unlikely(!(dev->flags & IFF_UP)))
+ continue;
+
+ 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, void *daddr, void *saddr,
+ unsigned len)
+{
+ const struct macvlan_dev *vlan = netdev_priv(dev);
+ struct net_device *lowerdev = vlan->lowerdev;
+
+ return lowerdev->hard_header(skb, lowerdev, type, daddr,
+ saddr ? : dev->dev_addr, len);
+}
+
+static int macvlan_open(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct macvlan_port *port = vlan->port;
+
+ hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
+ dev_set_promiscuity(vlan->lowerdev, 1);
+ return 0;
+}
+
+static int macvlan_stop(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ dev_set_promiscuity(vlan->lowerdev, -1);
+ hlist_del_rcu(&vlan->hlist);
+ synchronize_rcu();
+ return 0;
+}
+
+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);
+ 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_tx_csum = ethtool_op_get_tx_csum,
+ .get_tso = ethtool_op_get_tso,
+ .get_ufo = ethtool_op_get_ufo,
+ .get_sg = ethtool_op_get_sg,
+ .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->hard_header = macvlan_hard_header;
+ dev->hard_start_xmit = macvlan_hard_start_xmit;
+ dev->destructor = free_netdev;
+ dev->ethtool_ops = &macvlan_ethtool_ops;
+ dev->tx_queue_len = 0;
+
+ random_ether_addr(dev->dev_addr);
+}
+
+static LIST_HEAD(port_list);
+
+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);
+
+ list_add_tail(&port->list, &port_list);
+ return 0;
+}
+
+static void macvlan_dellink(struct net_device *dev);
+
+static void macvlan_port_cleanup(struct net_device *dev)
+{
+ struct macvlan_port *port = dev->macvlan_port;
+ struct macvlan_dev *vlan, *next;
+
+ list_for_each_entry_safe(vlan, next, &port->vlans, list)
+ macvlan_dellink(vlan->dev);
+
+ rcu_assign_pointer(dev->macvlan_port, NULL);
+ synchronize_rcu();
+
+ list_del(&port->list);
+ 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(lowerdev))
+ netif_carrier_off(dev);
+ }
+}
+
+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(nla_get_u32(tb[IFLA_LINK]));
+ if (lowerdev == NULL)
+ return -ENODEV;
+
+ if (!tb[IFLA_MTU])
+ dev->mtu = lowerdev->mtu;
+ else if (dev->mtu > lowerdev->mtu)
+ return -EINVAL;
+
+ 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);
+
+ list_del(&vlan->list);
+ unregister_netdevice(dev);
+}
+
+static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
+ .kind = "macvlan",
+ .priv_size = sizeof(struct macvlan_dev),
+ .setup = macvlan_setup,
+ .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;
+ struct macvlan_port *port;
+
+ port = dev->macvlan_port;
+ if (port == NULL)
+ goto out;
+
+ 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:
+ macvlan_port_cleanup(dev);
+ break;
+ }
+out:
+ 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)
+{
+ struct macvlan_port *port, *next;
+
+ rtnl_lock();
+ list_for_each_entry_safe(port, next, &port_list, list)
+ macvlan_port_cleanup(port->dev);
+ __rtnl_link_unregister(&macvlan_link_ops);
+ rtnl_unlock();
+
+ 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");
diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
new file mode 100644
index 0000000..0d9d7ea
--- /dev/null
+++ b/include/linux/if_macvlan.h
@@ -0,0 +1,9 @@
+#ifndef _LINUX_IF_MACVLAN_H
+#define _LINUX_IF_MACVLAN_H
+
+#ifdef __KERNEL__
+
+extern struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *);
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_IF_MACVLAN_H */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e7913ee..868140d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -535,6 +535,8 @@ struct net_device
/* bridge stuff */
struct net_bridge_port *br_port;
+ /* macvlan */
+ struct macvlan_port *macvlan_port;
/* class/net/name entry */
struct device dev;
diff --git a/net/core/dev.c b/net/core/dev.c
index 2609062..5974e5b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -98,6 +98,7 @@
#include <linux/seq_file.h>
#include <linux/stat.h>
#include <linux/if_bridge.h>
+#include <linux/if_macvlan.h>
#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
@@ -1793,6 +1794,28 @@ static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
#define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
#endif
+#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
+struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
+EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
+
+static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
+ struct packet_type **pt_prev,
+ int *ret,
+ struct net_device *orig_dev)
+{
+ if (skb->dev->macvlan_port == NULL)
+ return skb;
+
+ if (*pt_prev) {
+ *ret = deliver_skb(skb, *pt_prev, orig_dev);
+ *pt_prev = NULL;
+ }
+ return macvlan_handle_frame_hook(skb);
+}
+#else
+#define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
+#endif
+
#ifdef CONFIG_NET_CLS_ACT
/* TODO: Maybe we should just force sch_ingress to be compiled in
* when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
@@ -1900,6 +1923,9 @@ ncls:
skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
if (!skb)
goto out;
+ skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
+ if (!skb)
+ goto out;
type = skb->protocol;
list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
^ permalink raw reply related [flat|nested] 12+ messages in thread