diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/net/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/macvlan.c | 496 |
3 files changed, 507 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index ba314adf68b..d17d64eb706 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -82,6 +82,16 @@ 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 a2241e6e145..c26b8674213 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -128,6 +128,7 @@ 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 00000000000..dc74d006e01 --- /dev/null +++ b/drivers/net/macvlan.c @@ -0,0 +1,496 @@ +/* + * 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; + 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; + 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 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_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->change_rx_flags = macvlan_change_rx_flags; + dev->set_multicast_list = macvlan_set_multicast_list; + 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; +} + +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(lowerdev)) + 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(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 (!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"); |