/* * 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");