diff options
Diffstat (limited to 'drivers/net/macvlan.c')
| -rw-r--r-- | drivers/net/macvlan.c | 883 |
1 files changed, 883 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c new file mode 100644 index 00000000..025367a9 --- /dev/null +++ b/drivers/net/macvlan.c @@ -0,0 +1,883 @@ +/* + * 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/rculist.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_vlan.h> +#include <linux/if_link.h> +#include <linux/if_macvlan.h> +#include <net/rtnetlink.h> +#include <net/xfrm.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 rcu_head rcu; + bool passthru; + int count; +}; + +static void macvlan_port_destroy(struct net_device *dev); + +#define macvlan_port_get_rcu(dev) \ + ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data)) +#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data) +#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) + +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_64bits(vlan->dev->dev_addr, addr)) + return vlan; + } + return NULL; +} + +static void macvlan_hash_add(struct macvlan_dev *vlan) +{ + struct macvlan_port *port = vlan->port; + const unsigned char *addr = vlan->dev->dev_addr; + + hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); +} + +static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) +{ + hlist_del_rcu(&vlan->hlist); + if (sync) + synchronize_rcu(); +} + +static void macvlan_hash_change_addr(struct macvlan_dev *vlan, + const unsigned char *addr) +{ + macvlan_hash_del(vlan, true); + /* Now that we are unhashed it is safe to change the device + * address without confusing packet delivery. + */ + memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); + macvlan_hash_add(vlan); +} + +static int macvlan_addr_busy(const struct macvlan_port *port, + const unsigned char *addr) +{ + /* Test to see if the specified multicast address is + * currently in use by the underlying device or + * another macvlan. + */ + if (!compare_ether_addr_64bits(port->dev->dev_addr, addr)) + return 1; + + if (macvlan_hash_lookup(port, addr)) + return 1; + + return 0; +} + + +static int macvlan_broadcast_one(struct sk_buff *skb, + const struct macvlan_dev *vlan, + const struct ethhdr *eth, bool local) +{ + struct net_device *dev = vlan->dev; + if (!skb) + return NET_RX_DROP; + + if (local) + return vlan->forward(dev, skb); + + skb->dev = dev; + if (!compare_ether_addr_64bits(eth->h_dest, + dev->broadcast)) + skb->pkt_type = PACKET_BROADCAST; + else + skb->pkt_type = PACKET_MULTICAST; + + return vlan->receive(skb); +} + +static void macvlan_broadcast(struct sk_buff *skb, + const struct macvlan_port *port, + struct net_device *src, + enum macvlan_mode mode) +{ + const struct ethhdr *eth = eth_hdr(skb); + const struct macvlan_dev *vlan; + struct hlist_node *n; + struct sk_buff *nskb; + unsigned int i; + int err; + + if (skb->protocol == htons(ETH_P_PAUSE)) + return; + + for (i = 0; i < MACVLAN_HASH_SIZE; i++) { + hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { + if (vlan->dev == src || !(vlan->mode & mode)) + continue; + + nskb = skb_clone(skb, GFP_ATOMIC); + err = macvlan_broadcast_one(nskb, vlan, eth, + mode == MACVLAN_MODE_BRIDGE); + macvlan_count_rx(vlan, skb->len + ETH_HLEN, + err == NET_RX_SUCCESS, 1); + } + } +} + +/* called under rcu_read_lock() from netif_receive_skb */ +static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) +{ + struct macvlan_port *port; + struct sk_buff *skb = *pskb; + const struct ethhdr *eth = eth_hdr(skb); + const struct macvlan_dev *vlan; + const struct macvlan_dev *src; + struct net_device *dev; + unsigned int len = 0; + int ret = NET_RX_DROP; + + port = macvlan_port_get_rcu(skb->dev); + if (is_multicast_ether_addr(eth->h_dest)) { + skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); + if (!skb) + return RX_HANDLER_CONSUMED; + eth = eth_hdr(skb); + src = macvlan_hash_lookup(port, eth->h_source); + if (!src) + /* frame comes from an external address */ + macvlan_broadcast(skb, port, NULL, + MACVLAN_MODE_PRIVATE | + MACVLAN_MODE_VEPA | + MACVLAN_MODE_PASSTHRU| + MACVLAN_MODE_BRIDGE); + else if (src->mode == MACVLAN_MODE_VEPA) + /* flood to everyone except source */ + macvlan_broadcast(skb, port, src->dev, + MACVLAN_MODE_VEPA | + MACVLAN_MODE_BRIDGE); + else if (src->mode == MACVLAN_MODE_BRIDGE) + /* + * flood only to VEPA ports, bridge ports + * already saw the frame on the way out. + */ + macvlan_broadcast(skb, port, src->dev, + MACVLAN_MODE_VEPA); + else { + /* forward to original port. */ + vlan = src; + ret = macvlan_broadcast_one(skb, vlan, eth, 0); + goto out; + } + + return RX_HANDLER_PASS; + } + + if (port->passthru) + vlan = list_first_entry(&port->vlans, struct macvlan_dev, list); + else + vlan = macvlan_hash_lookup(port, eth->h_dest); + if (vlan == NULL) + return RX_HANDLER_PASS; + + dev = vlan->dev; + if (unlikely(!(dev->flags & IFF_UP))) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + len = skb->len + ETH_HLEN; + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto out; + + skb->dev = dev; + skb->pkt_type = PACKET_HOST; + + ret = vlan->receive(skb); + +out: + macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); + return RX_HANDLER_CONSUMED; +} + +static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) +{ + const struct macvlan_dev *vlan = netdev_priv(dev); + const struct macvlan_port *port = vlan->port; + const struct macvlan_dev *dest; + __u8 ip_summed = skb->ip_summed; + + if (vlan->mode == MACVLAN_MODE_BRIDGE) { + const struct ethhdr *eth = (void *)skb->data; + skb->ip_summed = CHECKSUM_UNNECESSARY; + + /* send to other bridge ports directly */ + if (is_multicast_ether_addr(eth->h_dest)) { + macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); + goto xmit_world; + } + + dest = macvlan_hash_lookup(port, eth->h_dest); + if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { + /* send to lowerdev first for its network taps */ + dev_forward_skb(vlan->lowerdev, skb); + + return NET_XMIT_SUCCESS; + } + } + +xmit_world: + skb->ip_summed = ip_summed; + skb->dev = vlan->lowerdev; + return dev_queue_xmit(skb); +} + +netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + unsigned int len = skb->len; + int ret; + const struct macvlan_dev *vlan = netdev_priv(dev); + + ret = macvlan_queue_xmit(skb, dev); + if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { + struct macvlan_pcpu_stats *pcpu_stats; + + pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); + u64_stats_update_begin(&pcpu_stats->syncp); + pcpu_stats->tx_packets++; + pcpu_stats->tx_bytes += len; + u64_stats_update_end(&pcpu_stats->syncp); + } else { + this_cpu_inc(vlan->pcpu_stats->tx_dropped); + } + return ret; +} +EXPORT_SYMBOL_GPL(macvlan_start_xmit); + +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 net_device *lowerdev = vlan->lowerdev; + int err; + + if (vlan->port->passthru) { + dev_set_promiscuity(lowerdev, 1); + goto hash_add; + } + + err = -EBUSY; + if (macvlan_addr_busy(vlan->port, dev->dev_addr)) + goto out; + + err = dev_uc_add(lowerdev, dev->dev_addr); + if (err < 0) + goto out; + if (dev->flags & IFF_ALLMULTI) { + err = dev_set_allmulti(lowerdev, 1); + if (err < 0) + goto del_unicast; + } + +hash_add: + macvlan_hash_add(vlan); + return 0; + +del_unicast: + dev_uc_del(lowerdev, dev->dev_addr); +out: + return err; +} + +static int macvlan_stop(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + if (vlan->port->passthru) { + dev_set_promiscuity(lowerdev, -1); + goto hash_del; + } + + dev_mc_unsync(lowerdev, dev); + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(lowerdev, -1); + + dev_uc_del(lowerdev, dev->dev_addr); + +hash_del: + macvlan_hash_del(vlan, !dev->dismantle); + 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)) { + /* Just copy in the new address */ + dev->addr_assign_type &= ~NET_ADDR_RANDOM; + memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); + } else { + /* Rehash and update the device filters */ + if (macvlan_addr_busy(vlan->port, addr->sa_data)) + return -EBUSY; + + err = dev_uc_add(lowerdev, addr->sa_data); + if (err) + return err; + + dev_uc_del(lowerdev, dev->dev_addr); + + macvlan_hash_change_addr(vlan, addr->sa_data); + } + 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; +static struct lock_class_key macvlan_netdev_addr_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 | NETIF_F_GRO | NETIF_F_RXCSUM | \ + NETIF_F_HW_VLAN_FILTER) + +#define MACVLAN_STATE_MASK \ + ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) + +static void macvlan_set_lockdep_class_one(struct net_device *dev, + struct netdev_queue *txq, + void *_unused) +{ + lockdep_set_class(&txq->_xmit_lock, + &macvlan_netdev_xmit_lock_key); +} + +static void macvlan_set_lockdep_class(struct net_device *dev) +{ + lockdep_set_class(&dev->addr_list_lock, + &macvlan_netdev_addr_lock_key); + netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); +} + +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->features |= NETIF_F_LLTX; + dev->gso_max_size = lowerdev->gso_max_size; + dev->iflink = lowerdev->ifindex; + dev->hard_header_len = lowerdev->hard_header_len; + + macvlan_set_lockdep_class(dev); + + vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats); + if (!vlan->pcpu_stats) + return -ENOMEM; + + return 0; +} + +static void macvlan_uninit(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct macvlan_port *port = vlan->port; + + free_percpu(vlan->pcpu_stats); + + port->count -= 1; + if (!port->count) + macvlan_port_destroy(port->dev); +} + +static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *stats) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + if (vlan->pcpu_stats) { + struct macvlan_pcpu_stats *p; + u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; + u32 rx_errors = 0, tx_dropped = 0; + unsigned int start; + int i; + + for_each_possible_cpu(i) { + p = per_cpu_ptr(vlan->pcpu_stats, i); + do { + start = u64_stats_fetch_begin_bh(&p->syncp); + rx_packets = p->rx_packets; + rx_bytes = p->rx_bytes; + rx_multicast = p->rx_multicast; + tx_packets = p->tx_packets; + tx_bytes = p->tx_bytes; + } while (u64_stats_fetch_retry_bh(&p->syncp, start)); + + stats->rx_packets += rx_packets; + stats->rx_bytes += rx_bytes; + stats->multicast += rx_multicast; + stats->tx_packets += tx_packets; + stats->tx_bytes += tx_bytes; + /* rx_errors & tx_dropped are u32, updated + * without syncp protection. + */ + rx_errors += p->rx_errors; + tx_dropped += p->tx_dropped; + } + stats->rx_errors = rx_errors; + stats->rx_dropped = rx_errors; + stats->tx_dropped = tx_dropped; + } + return stats; +} + +static int macvlan_vlan_rx_add_vid(struct net_device *dev, + unsigned short vid) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + return vlan_vid_add(lowerdev, vid); +} + +static int macvlan_vlan_rx_kill_vid(struct net_device *dev, + unsigned short vid) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + vlan_vid_del(lowerdev, vid); + 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 int macvlan_ethtool_get_settings(struct net_device *dev, + struct ethtool_cmd *cmd) +{ + const struct macvlan_dev *vlan = netdev_priv(dev); + + return __ethtool_get_settings(vlan->lowerdev, cmd); +} + +static const struct ethtool_ops macvlan_ethtool_ops = { + .get_link = ethtool_op_get_link, + .get_settings = macvlan_ethtool_get_settings, + .get_drvinfo = macvlan_ethtool_get_drvinfo, +}; + +static const struct net_device_ops macvlan_netdev_ops = { + .ndo_init = macvlan_init, + .ndo_uninit = macvlan_uninit, + .ndo_open = macvlan_open, + .ndo_stop = macvlan_stop, + .ndo_start_xmit = macvlan_start_xmit, + .ndo_change_mtu = macvlan_change_mtu, + .ndo_change_rx_flags = macvlan_change_rx_flags, + .ndo_set_mac_address = macvlan_set_mac_address, + .ndo_set_rx_mode = macvlan_set_multicast_list, + .ndo_get_stats64 = macvlan_dev_get_stats64, + .ndo_validate_addr = eth_validate_addr, + .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, +}; + +void macvlan_common_setup(struct net_device *dev) +{ + ether_setup(dev); + + dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); + dev->netdev_ops = &macvlan_netdev_ops; + dev->destructor = free_netdev; + dev->header_ops = &macvlan_hard_header_ops, + dev->ethtool_ops = &macvlan_ethtool_ops; +} +EXPORT_SYMBOL_GPL(macvlan_common_setup); + +static void macvlan_setup(struct net_device *dev) +{ + macvlan_common_setup(dev); + dev->tx_queue_len = 0; +} + +static int macvlan_port_create(struct net_device *dev) +{ + struct macvlan_port *port; + unsigned int i; + int err; + + if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) + return -EINVAL; + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (port == NULL) + return -ENOMEM; + + port->passthru = false; + port->dev = dev; + INIT_LIST_HEAD(&port->vlans); + for (i = 0; i < MACVLAN_HASH_SIZE; i++) + INIT_HLIST_HEAD(&port->vlan_hash[i]); + + err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); + if (err) + kfree(port); + else + dev->priv_flags |= IFF_MACVLAN_PORT; + return err; +} + +static void macvlan_port_destroy(struct net_device *dev) +{ + struct macvlan_port *port = macvlan_port_get(dev); + + dev->priv_flags &= ~IFF_MACVLAN_PORT; + netdev_rx_handler_unregister(dev); + kfree_rcu(port, rcu); +} + +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; + } + + if (data && data[IFLA_MACVLAN_MODE]) { + switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { + case MACVLAN_MODE_PRIVATE: + case MACVLAN_MODE_VEPA: + case MACVLAN_MODE_BRIDGE: + case MACVLAN_MODE_PASSTHRU: + break; + default: + return -EINVAL; + } + } + return 0; +} + +int macvlan_common_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + int (*receive)(struct sk_buff *skb), + int (*forward)(struct net_device *dev, + struct sk_buff *skb)) +{ + 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(src_net, nla_get_u32(tb[IFLA_LINK])); + if (lowerdev == NULL) + return -ENODEV; + + /* When creating macvlans on top of other macvlans - use + * the real device as the lowerdev. + */ + if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) { + struct macvlan_dev *lowervlan = netdev_priv(lowerdev); + lowerdev = lowervlan->lowerdev; + } + + if (!tb[IFLA_MTU]) + dev->mtu = lowerdev->mtu; + else if (dev->mtu > lowerdev->mtu) + return -EINVAL; + + if (!tb[IFLA_ADDRESS]) + eth_hw_addr_random(dev); + + if (!macvlan_port_exists(lowerdev)) { + err = macvlan_port_create(lowerdev); + if (err < 0) + return err; + } + port = macvlan_port_get(lowerdev); + + /* Only 1 macvlan device can be created in passthru mode */ + if (port->passthru) + return -EINVAL; + + vlan->lowerdev = lowerdev; + vlan->dev = dev; + vlan->port = port; + vlan->receive = receive; + vlan->forward = forward; + + vlan->mode = MACVLAN_MODE_VEPA; + if (data && data[IFLA_MACVLAN_MODE]) + vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + if (port->count) + return -EINVAL; + port->passthru = true; + memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN); + } + + port->count += 1; + err = register_netdevice(dev); + if (err < 0) + goto destroy_port; + + list_add_tail(&vlan->list, &port->vlans); + netif_stacked_transfer_operstate(lowerdev, dev); + + return 0; + +destroy_port: + port->count -= 1; + if (!port->count) + macvlan_port_destroy(lowerdev); + + return err; +} +EXPORT_SYMBOL_GPL(macvlan_common_newlink); + +static int macvlan_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + return macvlan_common_newlink(src_net, dev, tb, data, + netif_rx, + dev_forward_skb); +} + +void macvlan_dellink(struct net_device *dev, struct list_head *head) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + list_del(&vlan->list); + unregister_netdevice_queue(dev, head); +} +EXPORT_SYMBOL_GPL(macvlan_dellink); + +static int macvlan_changelink(struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + if (data && data[IFLA_MACVLAN_MODE]) + vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + return 0; +} + +static size_t macvlan_get_size(const struct net_device *dev) +{ + return nla_total_size(4); +} + +static int macvlan_fill_info(struct sk_buff *skb, + const struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode); + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { + [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, +}; + +int macvlan_link_register(struct rtnl_link_ops *ops) +{ + /* common fields */ + ops->priv_size = sizeof(struct macvlan_dev); + ops->validate = macvlan_validate; + ops->maxtype = IFLA_MACVLAN_MAX; + ops->policy = macvlan_policy; + ops->changelink = macvlan_changelink; + ops->get_size = macvlan_get_size; + ops->fill_info = macvlan_fill_info; + + return rtnl_link_register(ops); +}; +EXPORT_SYMBOL_GPL(macvlan_link_register); + +static struct rtnl_link_ops macvlan_link_ops = { + .kind = "macvlan", + .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, *next; + struct macvlan_port *port; + LIST_HEAD(list_kill); + + if (!macvlan_port_exists(dev)) + return NOTIFY_DONE; + + port = macvlan_port_get(dev); + + switch (event) { + case NETDEV_CHANGE: + list_for_each_entry(vlan, &port->vlans, list) + netif_stacked_transfer_operstate(vlan->lowerdev, + vlan->dev); + break; + case NETDEV_FEAT_CHANGE: + list_for_each_entry(vlan, &port->vlans, list) { + vlan->dev->features = dev->features & MACVLAN_FEATURES; + vlan->dev->gso_max_size = dev->gso_max_size; + netdev_features_change(vlan->dev); + } + break; + case NETDEV_UNREGISTER: + /* twiddle thumbs on netns device moves */ + if (dev->reg_state != NETREG_UNREGISTERING) + break; + + list_for_each_entry_safe(vlan, next, &port->vlans, list) + vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); + unregister_netdevice_many(&list_kill); + list_del(&list_kill); + break; + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlaying device to change its type. */ + return NOTIFY_BAD; + } + 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); + + err = macvlan_link_register(&macvlan_link_ops); + if (err < 0) + goto err1; + return 0; +err1: + unregister_netdevice_notifier(&macvlan_notifier_block); + return err; +} + +static void __exit macvlan_cleanup_module(void) +{ + rtnl_link_unregister(&macvlan_link_ops); + 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"); |