v4.19.13 snapshot.
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
new file mode 100644
index 0000000..6372cdc
--- /dev/null
+++ b/drivers/net/macvlan.c
@@ -0,0 +1,1733 @@
+/*
+ * 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 <linux/hash.h>
+#include <linux/workqueue.h>
+#include <net/rtnetlink.h>
+#include <net/xfrm.h>
+#include <linux/netpoll.h>
+
+#define MACVLAN_HASH_BITS 8
+#define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
+#define MACVLAN_BC_QUEUE_LEN 1000
+
+#define MACVLAN_F_PASSTHRU 1
+#define MACVLAN_F_ADDRCHANGE 2
+
+struct macvlan_port {
+ struct net_device *dev;
+ struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
+ struct list_head vlans;
+ struct sk_buff_head bc_queue;
+ struct work_struct bc_work;
+ u32 flags;
+ int count;
+ struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
+ DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
+ unsigned char perm_addr[ETH_ALEN];
+};
+
+struct macvlan_source_entry {
+ struct hlist_node hlist;
+ struct macvlan_dev *vlan;
+ unsigned char addr[6+2] __aligned(sizeof(u16));
+ struct rcu_head rcu;
+};
+
+struct macvlan_skb_cb {
+ const struct macvlan_dev *src;
+};
+
+#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
+
+static void macvlan_port_destroy(struct net_device *dev);
+
+static inline bool macvlan_passthru(const struct macvlan_port *port)
+{
+ return port->flags & MACVLAN_F_PASSTHRU;
+}
+
+static inline void macvlan_set_passthru(struct macvlan_port *port)
+{
+ port->flags |= MACVLAN_F_PASSTHRU;
+}
+
+static inline bool macvlan_addr_change(const struct macvlan_port *port)
+{
+ return port->flags & MACVLAN_F_ADDRCHANGE;
+}
+
+static inline void macvlan_set_addr_change(struct macvlan_port *port)
+{
+ port->flags |= MACVLAN_F_ADDRCHANGE;
+}
+
+static inline void macvlan_clear_addr_change(struct macvlan_port *port)
+{
+ port->flags &= ~MACVLAN_F_ADDRCHANGE;
+}
+
+/* Hash Ethernet address */
+static u32 macvlan_eth_hash(const unsigned char *addr)
+{
+ u64 value = get_unaligned((u64 *)addr);
+
+ /* only want 6 bytes */
+#ifdef __BIG_ENDIAN
+ value >>= 16;
+#else
+ value <<= 16;
+#endif
+ return hash_64(value, MACVLAN_HASH_BITS);
+}
+
+static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
+{
+ return rcu_dereference(dev->rx_handler_data);
+}
+
+static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
+{
+ return rtnl_dereference(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;
+ u32 idx = macvlan_eth_hash(addr);
+
+ hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
+ if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
+ return vlan;
+ }
+ return NULL;
+}
+
+static struct macvlan_source_entry *macvlan_hash_lookup_source(
+ const struct macvlan_dev *vlan,
+ const unsigned char *addr)
+{
+ struct macvlan_source_entry *entry;
+ u32 idx = macvlan_eth_hash(addr);
+ struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
+
+ hlist_for_each_entry_rcu(entry, h, hlist) {
+ if (ether_addr_equal_64bits(entry->addr, addr) &&
+ entry->vlan == vlan)
+ return entry;
+ }
+ return NULL;
+}
+
+static int macvlan_hash_add_source(struct macvlan_dev *vlan,
+ const unsigned char *addr)
+{
+ struct macvlan_port *port = vlan->port;
+ struct macvlan_source_entry *entry;
+ struct hlist_head *h;
+
+ entry = macvlan_hash_lookup_source(vlan, addr);
+ if (entry)
+ return 0;
+
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ ether_addr_copy(entry->addr, addr);
+ entry->vlan = vlan;
+ h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
+ hlist_add_head_rcu(&entry->hlist, h);
+ vlan->macaddr_count++;
+
+ return 0;
+}
+
+static void macvlan_hash_add(struct macvlan_dev *vlan)
+{
+ struct macvlan_port *port = vlan->port;
+ const unsigned char *addr = vlan->dev->dev_addr;
+ u32 idx = macvlan_eth_hash(addr);
+
+ hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
+}
+
+static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
+{
+ hlist_del_rcu(&entry->hlist);
+ kfree_rcu(entry, rcu);
+}
+
+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 bool macvlan_addr_busy(const struct macvlan_port *port,
+ const unsigned char *addr)
+{
+ /* Test to see if the specified address is
+ * currently in use by the underlying device or
+ * another macvlan.
+ */
+ if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
+ ether_addr_equal_64bits(port->dev->dev_addr, addr))
+ return true;
+
+ if (macvlan_hash_lookup(port, addr))
+ return true;
+
+ return false;
+}
+
+
+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 (local)
+ return __dev_forward_skb(dev, skb);
+
+ skb->dev = dev;
+ if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
+ skb->pkt_type = PACKET_BROADCAST;
+ else
+ skb->pkt_type = PACKET_MULTICAST;
+
+ return 0;
+}
+
+static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
+{
+ return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
+}
+
+
+static unsigned int mc_hash(const struct macvlan_dev *vlan,
+ const unsigned char *addr)
+{
+ u32 val = __get_unaligned_cpu32(addr + 2);
+
+ val ^= macvlan_hash_mix(vlan);
+ return hash_32(val, MACVLAN_MC_FILTER_BITS);
+}
+
+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 sk_buff *nskb;
+ unsigned int i;
+ int err;
+ unsigned int hash;
+
+ if (skb->protocol == htons(ETH_P_PAUSE))
+ return;
+
+ for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
+ hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
+ if (vlan->dev == src || !(vlan->mode & mode))
+ continue;
+
+ hash = mc_hash(vlan, eth->h_dest);
+ if (!test_bit(hash, vlan->mc_filter))
+ continue;
+
+ err = NET_RX_DROP;
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (likely(nskb))
+ err = macvlan_broadcast_one(
+ nskb, vlan, eth,
+ mode == MACVLAN_MODE_BRIDGE) ?:
+ netif_rx_ni(nskb);
+ macvlan_count_rx(vlan, skb->len + ETH_HLEN,
+ err == NET_RX_SUCCESS, true);
+ }
+ }
+}
+
+static void macvlan_process_broadcast(struct work_struct *w)
+{
+ struct macvlan_port *port = container_of(w, struct macvlan_port,
+ bc_work);
+ struct sk_buff *skb;
+ struct sk_buff_head list;
+
+ __skb_queue_head_init(&list);
+
+ spin_lock_bh(&port->bc_queue.lock);
+ skb_queue_splice_tail_init(&port->bc_queue, &list);
+ spin_unlock_bh(&port->bc_queue.lock);
+
+ while ((skb = __skb_dequeue(&list))) {
+ const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+ rcu_read_lock();
+
+ 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
+ /*
+ * flood only to VEPA ports, bridge ports
+ * already saw the frame on the way out.
+ */
+ macvlan_broadcast(skb, port, src->dev,
+ MACVLAN_MODE_VEPA);
+
+ rcu_read_unlock();
+
+ if (src)
+ dev_put(src->dev);
+ kfree_skb(skb);
+ }
+}
+
+static void macvlan_broadcast_enqueue(struct macvlan_port *port,
+ const struct macvlan_dev *src,
+ struct sk_buff *skb)
+{
+ struct sk_buff *nskb;
+ int err = -ENOMEM;
+
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ goto err;
+
+ MACVLAN_SKB_CB(nskb)->src = src;
+
+ spin_lock(&port->bc_queue.lock);
+ if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
+ if (src)
+ dev_hold(src->dev);
+ __skb_queue_tail(&port->bc_queue, nskb);
+ err = 0;
+ }
+ spin_unlock(&port->bc_queue.lock);
+
+ if (err)
+ goto free_nskb;
+
+ schedule_work(&port->bc_work);
+ return;
+
+free_nskb:
+ kfree_skb(nskb);
+err:
+ atomic_long_inc(&skb->dev->rx_dropped);
+}
+
+static void macvlan_flush_sources(struct macvlan_port *port,
+ struct macvlan_dev *vlan)
+{
+ int i;
+
+ for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
+ struct hlist_node *h, *n;
+
+ hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
+ struct macvlan_source_entry *entry;
+
+ entry = hlist_entry(h, struct macvlan_source_entry,
+ hlist);
+ if (entry->vlan == vlan)
+ macvlan_hash_del_source(entry);
+ }
+ }
+ vlan->macaddr_count = 0;
+}
+
+static void macvlan_forward_source_one(struct sk_buff *skb,
+ struct macvlan_dev *vlan)
+{
+ struct sk_buff *nskb;
+ struct net_device *dev;
+ int len;
+ int ret;
+
+ dev = vlan->dev;
+ if (unlikely(!(dev->flags & IFF_UP)))
+ return;
+
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ return;
+
+ len = nskb->len + ETH_HLEN;
+ nskb->dev = dev;
+
+ if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
+ nskb->pkt_type = PACKET_HOST;
+
+ ret = netif_rx(nskb);
+ macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
+}
+
+static void macvlan_forward_source(struct sk_buff *skb,
+ struct macvlan_port *port,
+ const unsigned char *addr)
+{
+ struct macvlan_source_entry *entry;
+ u32 idx = macvlan_eth_hash(addr);
+ struct hlist_head *h = &port->vlan_source_hash[idx];
+
+ hlist_for_each_entry_rcu(entry, h, hlist) {
+ if (ether_addr_equal_64bits(entry->addr, addr))
+ macvlan_forward_source_one(skb, entry->vlan);
+ }
+}
+
+/* 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;
+ rx_handler_result_t handle_res;
+
+ port = macvlan_port_get_rcu(skb->dev);
+ if (is_multicast_ether_addr(eth->h_dest)) {
+ unsigned int hash;
+
+ skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
+ if (!skb)
+ return RX_HANDLER_CONSUMED;
+ *pskb = skb;
+ eth = eth_hdr(skb);
+ macvlan_forward_source(skb, port, eth->h_source);
+ src = macvlan_hash_lookup(port, eth->h_source);
+ if (src && src->mode != MACVLAN_MODE_VEPA &&
+ src->mode != MACVLAN_MODE_BRIDGE) {
+ /* forward to original port. */
+ vlan = src;
+ ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
+ netif_rx(skb);
+ handle_res = RX_HANDLER_CONSUMED;
+ goto out;
+ }
+
+ hash = mc_hash(NULL, eth->h_dest);
+ if (test_bit(hash, port->mc_filter))
+ macvlan_broadcast_enqueue(port, src, skb);
+
+ return RX_HANDLER_PASS;
+ }
+
+ macvlan_forward_source(skb, port, eth->h_source);
+ if (macvlan_passthru(port))
+ vlan = list_first_or_null_rcu(&port->vlans,
+ struct macvlan_dev, list);
+ else
+ vlan = macvlan_hash_lookup(port, eth->h_dest);
+ if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
+ 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) {
+ ret = NET_RX_DROP;
+ handle_res = RX_HANDLER_CONSUMED;
+ goto out;
+ }
+
+ *pskb = skb;
+ skb->dev = dev;
+ skb->pkt_type = PACKET_HOST;
+
+ ret = NET_RX_SUCCESS;
+ handle_res = RX_HANDLER_ANOTHER;
+out:
+ macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
+ return handle_res;
+}
+
+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;
+
+ if (vlan->mode == MACVLAN_MODE_BRIDGE) {
+ const struct ethhdr *eth = (void *)skb->data;
+
+ /* 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->dev = vlan->lowerdev;
+ return dev_queue_xmit_accel(skb,
+ netdev_get_sb_channel(dev) ? dev : NULL);
+}
+
+static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ if (vlan->netpoll)
+ netpoll_send_skb(vlan->netpoll, skb);
+#else
+ BUG();
+#endif
+ return NETDEV_TX_OK;
+}
+
+static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ unsigned int len = skb->len;
+ int ret;
+
+ if (unlikely(netpoll_tx_running(dev)))
+ return macvlan_netpoll_send_skb(vlan, skb);
+
+ ret = macvlan_queue_xmit(skb, dev);
+
+ if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
+ struct vlan_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;
+}
+
+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,
+ .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 (macvlan_passthru(vlan->port)) {
+ if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
+ err = dev_set_promiscuity(lowerdev, 1);
+ if (err < 0)
+ goto out;
+ }
+ goto hash_add;
+ }
+
+ err = -EADDRINUSE;
+ if (macvlan_addr_busy(vlan->port, dev->dev_addr))
+ goto out;
+
+ /* Attempt to populate accel_priv which is used to offload the L2
+ * forwarding requests for unicast packets.
+ */
+ if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
+ vlan->accel_priv =
+ lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
+
+ /* If earlier attempt to offload failed, or accel_priv is not
+ * populated we must add the unicast address to the lower device.
+ */
+ if (IS_ERR_OR_NULL(vlan->accel_priv)) {
+ vlan->accel_priv = NULL;
+ 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;
+ }
+
+ if (dev->flags & IFF_PROMISC) {
+ err = dev_set_promiscuity(lowerdev, 1);
+ if (err < 0)
+ goto clear_multi;
+ }
+
+hash_add:
+ macvlan_hash_add(vlan);
+ return 0;
+
+clear_multi:
+ if (dev->flags & IFF_ALLMULTI)
+ dev_set_allmulti(lowerdev, -1);
+del_unicast:
+ if (vlan->accel_priv) {
+ lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
+ vlan->accel_priv);
+ vlan->accel_priv = NULL;
+ } else {
+ 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->accel_priv) {
+ lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
+ vlan->accel_priv);
+ vlan->accel_priv = NULL;
+ }
+
+ dev_uc_unsync(lowerdev, dev);
+ dev_mc_unsync(lowerdev, dev);
+
+ if (macvlan_passthru(vlan->port)) {
+ if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
+ dev_set_promiscuity(lowerdev, -1);
+ goto hash_del;
+ }
+
+ if (dev->flags & IFF_ALLMULTI)
+ dev_set_allmulti(lowerdev, -1);
+
+ if (dev->flags & IFF_PROMISC)
+ dev_set_promiscuity(lowerdev, -1);
+
+ dev_uc_del(lowerdev, dev->dev_addr);
+
+hash_del:
+ macvlan_hash_del(vlan, !dev->dismantle);
+ return 0;
+}
+
+static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct net_device *lowerdev = vlan->lowerdev;
+ struct macvlan_port *port = vlan->port;
+ int err;
+
+ if (!(dev->flags & IFF_UP)) {
+ /* Just copy in the new address */
+ ether_addr_copy(dev->dev_addr, addr);
+ } else {
+ /* Rehash and update the device filters */
+ if (macvlan_addr_busy(vlan->port, addr))
+ return -EADDRINUSE;
+
+ if (!macvlan_passthru(port)) {
+ err = dev_uc_add(lowerdev, addr);
+ if (err)
+ return err;
+
+ dev_uc_del(lowerdev, dev->dev_addr);
+ }
+
+ macvlan_hash_change_addr(vlan, addr);
+ }
+ if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
+ /* Since addr_change isn't set, we are here due to lower
+ * device change. Save the lower-dev address so we can
+ * restore it later.
+ */
+ ether_addr_copy(vlan->port->perm_addr,
+ lowerdev->dev_addr);
+ }
+ macvlan_clear_addr_change(port);
+ return 0;
+}
+
+static int macvlan_set_mac_address(struct net_device *dev, void *p)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct sockaddr *addr = p;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ /* If the addresses are the same, this is a no-op */
+ if (ether_addr_equal(dev->dev_addr, addr->sa_data))
+ return 0;
+
+ if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+ macvlan_set_addr_change(vlan->port);
+ return dev_set_mac_address(vlan->lowerdev, addr);
+ }
+
+ if (macvlan_addr_busy(vlan->port, addr->sa_data))
+ return -EADDRINUSE;
+
+ return macvlan_sync_address(dev, addr->sa_data);
+}
+
+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 (dev->flags & IFF_UP) {
+ if (change & IFF_ALLMULTI)
+ dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+ if (change & IFF_PROMISC)
+ dev_set_promiscuity(lowerdev,
+ dev->flags & IFF_PROMISC ? 1 : -1);
+
+ }
+}
+
+static void macvlan_compute_filter(unsigned long *mc_filter,
+ struct net_device *dev,
+ struct macvlan_dev *vlan)
+{
+ if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
+ bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
+ } else {
+ struct netdev_hw_addr *ha;
+ DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
+
+ bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
+ netdev_for_each_mc_addr(ha, dev) {
+ __set_bit(mc_hash(vlan, ha->addr), filter);
+ }
+
+ __set_bit(mc_hash(vlan, dev->broadcast), filter);
+
+ bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
+ }
+}
+
+static void macvlan_set_mac_lists(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ macvlan_compute_filter(vlan->mc_filter, dev, vlan);
+
+ dev_uc_sync(vlan->lowerdev, dev);
+ dev_mc_sync(vlan->lowerdev, dev);
+
+ /* This is slightly inaccurate as we're including the subscription
+ * list of vlan->lowerdev too.
+ *
+ * Bug alert: This only works if everyone has the same broadcast
+ * address as lowerdev. As soon as someone changes theirs this
+ * will break.
+ *
+ * However, this is already broken as when you change your broadcast
+ * address we don't get called.
+ *
+ * The solution is to maintain a list of broadcast addresses like
+ * we do for uc/mc, if you care.
+ */
+ macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
+}
+
+static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ if (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_addr_lock_key;
+
+#define ALWAYS_ON_OFFLOADS \
+ (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
+ NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
+
+#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
+
+#define MACVLAN_FEATURES \
+ (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
+ NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
+ NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
+ NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
+
+#define MACVLAN_STATE_MASK \
+ ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
+
+static int macvlan_get_nest_level(struct net_device *dev)
+{
+ return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
+}
+
+static void macvlan_set_lockdep_class(struct net_device *dev)
+{
+ netdev_lockdep_set_classes(dev);
+ lockdep_set_class_and_subclass(&dev->addr_list_lock,
+ &macvlan_netdev_addr_lock_key,
+ macvlan_get_nest_level(dev));
+}
+
+static int macvlan_init(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ const struct net_device *lowerdev = vlan->lowerdev;
+ struct macvlan_port *port = vlan->port;
+
+ dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
+ (lowerdev->state & MACVLAN_STATE_MASK);
+ dev->features = lowerdev->features & MACVLAN_FEATURES;
+ dev->features |= ALWAYS_ON_FEATURES;
+ dev->hw_features |= NETIF_F_LRO;
+ dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
+ dev->vlan_features |= ALWAYS_ON_OFFLOADS;
+ dev->hw_enc_features |= dev->features;
+ dev->gso_max_size = lowerdev->gso_max_size;
+ dev->gso_max_segs = lowerdev->gso_max_segs;
+ dev->hard_header_len = lowerdev->hard_header_len;
+
+ macvlan_set_lockdep_class(dev);
+
+ vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
+ if (!vlan->pcpu_stats)
+ return -ENOMEM;
+
+ port->count += 1;
+
+ 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);
+
+ macvlan_flush_sources(port, vlan);
+ port->count -= 1;
+ if (!port->count)
+ macvlan_port_destroy(port->dev);
+}
+
+static void 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 vlan_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_irq(&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_irq(&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;
+ }
+}
+
+static int macvlan_vlan_rx_add_vid(struct net_device *dev,
+ __be16 proto, u16 vid)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct net_device *lowerdev = vlan->lowerdev;
+
+ return vlan_vid_add(lowerdev, proto, vid);
+}
+
+static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
+ __be16 proto, u16 vid)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct net_device *lowerdev = vlan->lowerdev;
+
+ vlan_vid_del(lowerdev, proto, vid);
+ return 0;
+}
+
+static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr, u16 vid,
+ u16 flags)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ int err = -EINVAL;
+
+ /* Support unicast filter only on passthru devices.
+ * Multicast filter should be allowed on all devices.
+ */
+ if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+ return -EOPNOTSUPP;
+
+ if (flags & NLM_F_REPLACE)
+ return -EOPNOTSUPP;
+
+ if (is_unicast_ether_addr(addr))
+ err = dev_uc_add_excl(dev, addr);
+ else if (is_multicast_ether_addr(addr))
+ err = dev_mc_add_excl(dev, addr);
+
+ return err;
+}
+
+static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
+ struct net_device *dev,
+ const unsigned char *addr, u16 vid)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ int err = -EINVAL;
+
+ /* Support unicast filter only on passthru devices.
+ * Multicast filter should be allowed on all devices.
+ */
+ if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+ return -EOPNOTSUPP;
+
+ if (is_unicast_ether_addr(addr))
+ err = dev_uc_del(dev, addr);
+ else if (is_multicast_ether_addr(addr))
+ err = dev_mc_del(dev, addr);
+
+ return err;
+}
+
+static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *drvinfo)
+{
+ strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
+ strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
+}
+
+static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
+ struct ethtool_link_ksettings *cmd)
+{
+ const struct macvlan_dev *vlan = netdev_priv(dev);
+
+ return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
+}
+
+static netdev_features_t macvlan_fix_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ netdev_features_t lowerdev_features = vlan->lowerdev->features;
+ netdev_features_t mask;
+
+ features |= NETIF_F_ALL_FOR_ALL;
+ features &= (vlan->set_features | ~MACVLAN_FEATURES);
+ mask = features;
+
+ lowerdev_features &= (features | ~NETIF_F_LRO);
+ features = netdev_increment_features(lowerdev_features, features, mask);
+ features |= ALWAYS_ON_FEATURES;
+ features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
+
+ return features;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void macvlan_dev_poll_controller(struct net_device *dev)
+{
+ return;
+}
+
+static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct net_device *real_dev = vlan->lowerdev;
+ struct netpoll *netpoll;
+ int err = 0;
+
+ netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
+ err = -ENOMEM;
+ if (!netpoll)
+ goto out;
+
+ err = __netpoll_setup(netpoll, real_dev);
+ if (err) {
+ kfree(netpoll);
+ goto out;
+ }
+
+ vlan->netpoll = netpoll;
+
+out:
+ return err;
+}
+
+static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct netpoll *netpoll = vlan->netpoll;
+
+ if (!netpoll)
+ return;
+
+ vlan->netpoll = NULL;
+
+ __netpoll_free_async(netpoll);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
+static int macvlan_dev_get_iflink(const struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ return vlan->lowerdev->ifindex;
+}
+
+static const struct ethtool_ops macvlan_ethtool_ops = {
+ .get_link = ethtool_op_get_link,
+ .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
+ .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_fix_features = macvlan_fix_features,
+ .ndo_change_rx_flags = macvlan_change_rx_flags,
+ .ndo_set_mac_address = macvlan_set_mac_address,
+ .ndo_set_rx_mode = macvlan_set_mac_lists,
+ .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,
+ .ndo_fdb_add = macvlan_fdb_add,
+ .ndo_fdb_del = macvlan_fdb_del,
+ .ndo_fdb_dump = ndo_dflt_fdb_dump,
+ .ndo_get_lock_subclass = macvlan_get_nest_level,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = macvlan_dev_poll_controller,
+ .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
+ .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
+#endif
+ .ndo_get_iflink = macvlan_dev_get_iflink,
+ .ndo_features_check = passthru_features_check,
+};
+
+void macvlan_common_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+
+ dev->min_mtu = 0;
+ dev->max_mtu = ETH_MAX_MTU;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ netif_keep_dst(dev);
+ dev->priv_flags |= IFF_UNICAST_FLT;
+ dev->netdev_ops = &macvlan_netdev_ops;
+ dev->needs_free_netdev = true;
+ 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->priv_flags |= IFF_NO_QUEUE;
+}
+
+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;
+
+ if (netdev_is_rx_handler_busy(dev))
+ return -EBUSY;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (port == NULL)
+ return -ENOMEM;
+
+ port->dev = dev;
+ ether_addr_copy(port->perm_addr, dev->dev_addr);
+ INIT_LIST_HEAD(&port->vlans);
+ for (i = 0; i < MACVLAN_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&port->vlan_hash[i]);
+ for (i = 0; i < MACVLAN_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
+
+ skb_queue_head_init(&port->bc_queue);
+ INIT_WORK(&port->bc_work, macvlan_process_broadcast);
+
+ 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_rtnl(dev);
+ struct sk_buff *skb;
+
+ dev->priv_flags &= ~IFF_MACVLAN_PORT;
+ netdev_rx_handler_unregister(dev);
+
+ /* After this point, no packet can schedule bc_work anymore,
+ * but we need to cancel it and purge left skbs if any.
+ */
+ cancel_work_sync(&port->bc_work);
+
+ while ((skb = __skb_dequeue(&port->bc_queue))) {
+ const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+ if (src)
+ dev_put(src->dev);
+
+ kfree_skb(skb);
+ }
+
+ /* If the lower device address has been changed by passthru
+ * macvlan, put it back.
+ */
+ if (macvlan_passthru(port) &&
+ !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
+ struct sockaddr sa;
+
+ sa.sa_family = port->dev->type;
+ memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
+ dev_set_mac_address(port->dev, &sa);
+ }
+
+ kfree(port);
+}
+
+static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ 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)
+ return 0;
+
+ if (data[IFLA_MACVLAN_FLAGS] &&
+ nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
+ return -EINVAL;
+
+ if (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:
+ case MACVLAN_MODE_SOURCE:
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (data[IFLA_MACVLAN_MACADDR_MODE]) {
+ switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
+ case MACVLAN_MACADDR_ADD:
+ case MACVLAN_MACADDR_DEL:
+ case MACVLAN_MACADDR_FLUSH:
+ case MACVLAN_MACADDR_SET:
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (data[IFLA_MACVLAN_MACADDR]) {
+ if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
+ return -EINVAL;
+
+ if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
+ return -EADDRNOTAVAIL;
+ }
+
+ if (data[IFLA_MACVLAN_MACADDR_COUNT])
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * reconfigure list of remote source mac address
+ * (only for macvlan devices in source mode)
+ * Note regarding alignment: all netlink data is aligned to 4 Byte, which
+ * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
+ */
+static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
+ struct nlattr *data[])
+{
+ char *addr = NULL;
+ int ret, rem, len;
+ struct nlattr *nla, *head;
+ struct macvlan_source_entry *entry;
+
+ if (data[IFLA_MACVLAN_MACADDR])
+ addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
+
+ if (mode == MACVLAN_MACADDR_ADD) {
+ if (!addr)
+ return -EINVAL;
+
+ return macvlan_hash_add_source(vlan, addr);
+
+ } else if (mode == MACVLAN_MACADDR_DEL) {
+ if (!addr)
+ return -EINVAL;
+
+ entry = macvlan_hash_lookup_source(vlan, addr);
+ if (entry) {
+ macvlan_hash_del_source(entry);
+ vlan->macaddr_count--;
+ }
+ } else if (mode == MACVLAN_MACADDR_FLUSH) {
+ macvlan_flush_sources(vlan->port, vlan);
+ } else if (mode == MACVLAN_MACADDR_SET) {
+ macvlan_flush_sources(vlan->port, vlan);
+
+ if (addr) {
+ ret = macvlan_hash_add_source(vlan, addr);
+ if (ret)
+ return ret;
+ }
+
+ if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
+ return 0;
+
+ head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
+ len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
+
+ nla_for_each_attr(nla, head, len, rem) {
+ if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
+ nla_len(nla) != ETH_ALEN)
+ continue;
+
+ addr = nla_data(nla);
+ ret = macvlan_hash_add_source(vlan, addr);
+ if (ret)
+ return ret;
+ }
+ } else {
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ struct macvlan_port *port;
+ struct net_device *lowerdev;
+ int err;
+ int macmode;
+ bool create = false;
+
+ 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 or macvtaps on top of other macvlans - use
+ * the real device as the lowerdev.
+ */
+ if (netif_is_macvlan(lowerdev))
+ lowerdev = macvlan_dev_real_dev(lowerdev);
+
+ if (!tb[IFLA_MTU])
+ dev->mtu = lowerdev->mtu;
+ else if (dev->mtu > lowerdev->mtu)
+ return -EINVAL;
+
+ /* MTU range: 68 - lowerdev->max_mtu */
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = lowerdev->max_mtu;
+
+ if (!tb[IFLA_ADDRESS])
+ eth_hw_addr_random(dev);
+
+ if (!macvlan_port_exists(lowerdev)) {
+ err = macvlan_port_create(lowerdev);
+ if (err < 0)
+ return err;
+ create = true;
+ }
+ port = macvlan_port_get_rtnl(lowerdev);
+
+ /* Only 1 macvlan device can be created in passthru mode */
+ if (macvlan_passthru(port)) {
+ /* The macvlan port must be not created this time,
+ * still goto destroy_macvlan_port for readability.
+ */
+ err = -EINVAL;
+ goto destroy_macvlan_port;
+ }
+
+ vlan->lowerdev = lowerdev;
+ vlan->dev = dev;
+ vlan->port = port;
+ vlan->set_features = MACVLAN_FEATURES;
+ vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
+
+ vlan->mode = MACVLAN_MODE_VEPA;
+ if (data && data[IFLA_MACVLAN_MODE])
+ vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
+
+ if (data && data[IFLA_MACVLAN_FLAGS])
+ vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
+
+ if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+ if (port->count) {
+ err = -EINVAL;
+ goto destroy_macvlan_port;
+ }
+ macvlan_set_passthru(port);
+ eth_hw_addr_inherit(dev, lowerdev);
+ }
+
+ if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
+ if (vlan->mode != MACVLAN_MODE_SOURCE) {
+ err = -EINVAL;
+ goto destroy_macvlan_port;
+ }
+ macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
+ err = macvlan_changelink_sources(vlan, macmode, data);
+ if (err)
+ goto destroy_macvlan_port;
+ }
+
+ err = register_netdevice(dev);
+ if (err < 0)
+ goto destroy_macvlan_port;
+
+ dev->priv_flags |= IFF_MACVLAN;
+ err = netdev_upper_dev_link(lowerdev, dev, extack);
+ if (err)
+ goto unregister_netdev;
+
+ list_add_tail_rcu(&vlan->list, &port->vlans);
+ netif_stacked_transfer_operstate(lowerdev, dev);
+ linkwatch_fire_event(dev);
+
+ return 0;
+
+unregister_netdev:
+ /* macvlan_uninit would free the macvlan port */
+ unregister_netdevice(dev);
+ return err;
+destroy_macvlan_port:
+ /* the macvlan port may be freed by macvlan_uninit when fail to register.
+ * so we destroy the macvlan port only when it's valid.
+ */
+ if (create && macvlan_port_get_rtnl(lowerdev))
+ macvlan_port_destroy(port->dev);
+ 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[],
+ struct netlink_ext_ack *extack)
+{
+ return macvlan_common_newlink(src_net, dev, tb, data, extack);
+}
+
+void macvlan_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ if (vlan->mode == MACVLAN_MODE_SOURCE)
+ macvlan_flush_sources(vlan->port, vlan);
+ list_del_rcu(&vlan->list);
+ unregister_netdevice_queue(dev, head);
+ netdev_upper_dev_unlink(vlan->lowerdev, dev);
+}
+EXPORT_SYMBOL_GPL(macvlan_dellink);
+
+static int macvlan_changelink(struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ enum macvlan_mode mode;
+ bool set_mode = false;
+ enum macvlan_macaddr_mode macmode;
+ int ret;
+
+ /* Validate mode, but don't set yet: setting flags may fail. */
+ if (data && data[IFLA_MACVLAN_MODE]) {
+ set_mode = true;
+ mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
+ /* Passthrough mode can't be set or cleared dynamically */
+ if ((mode == MACVLAN_MODE_PASSTHRU) !=
+ (vlan->mode == MACVLAN_MODE_PASSTHRU))
+ return -EINVAL;
+ if (vlan->mode == MACVLAN_MODE_SOURCE &&
+ vlan->mode != mode)
+ macvlan_flush_sources(vlan->port, vlan);
+ }
+
+ if (data && data[IFLA_MACVLAN_FLAGS]) {
+ __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
+ bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
+ if (macvlan_passthru(vlan->port) && promisc) {
+ int err;
+
+ if (flags & MACVLAN_FLAG_NOPROMISC)
+ err = dev_set_promiscuity(vlan->lowerdev, -1);
+ else
+ err = dev_set_promiscuity(vlan->lowerdev, 1);
+ if (err < 0)
+ return err;
+ }
+ vlan->flags = flags;
+ }
+ if (set_mode)
+ vlan->mode = mode;
+ if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
+ if (vlan->mode != MACVLAN_MODE_SOURCE)
+ return -EINVAL;
+ macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
+ ret = macvlan_changelink_sources(vlan, macmode, data);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
+{
+ if (vlan->macaddr_count == 0)
+ return 0;
+ return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
+ + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
+}
+
+static size_t macvlan_get_size(const struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+
+ return (0
+ + nla_total_size(4) /* IFLA_MACVLAN_MODE */
+ + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
+ + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
+ + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
+ );
+}
+
+static int macvlan_fill_info_macaddr(struct sk_buff *skb,
+ const struct macvlan_dev *vlan,
+ const int i)
+{
+ struct hlist_head *h = &vlan->port->vlan_source_hash[i];
+ struct macvlan_source_entry *entry;
+
+ hlist_for_each_entry_rcu(entry, h, hlist) {
+ if (entry->vlan != vlan)
+ continue;
+ if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
+ return 1;
+ }
+ return 0;
+}
+
+static int macvlan_fill_info(struct sk_buff *skb,
+ const struct net_device *dev)
+{
+ struct macvlan_dev *vlan = netdev_priv(dev);
+ int i;
+ struct nlattr *nest;
+
+ if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
+ goto nla_put_failure;
+ if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
+ goto nla_put_failure;
+ if (vlan->macaddr_count > 0) {
+ nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
+ if (macvlan_fill_info_macaddr(skb, vlan, i))
+ goto nla_put_failure;
+ }
+ nla_nest_end(skb, nest);
+ }
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
+ [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
+ [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
+ [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
+ [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
+ [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
+ [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
+};
+
+int macvlan_link_register(struct rtnl_link_ops *ops)
+{
+ /* common fields */
+ 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 net *macvlan_get_link_net(const struct net_device *dev)
+{
+ return dev_net(macvlan_dev_real_dev(dev));
+}
+
+static struct rtnl_link_ops macvlan_link_ops = {
+ .kind = "macvlan",
+ .setup = macvlan_setup,
+ .newlink = macvlan_newlink,
+ .dellink = macvlan_dellink,
+ .get_link_net = macvlan_get_link_net,
+ .priv_size = sizeof(struct macvlan_dev),
+};
+
+static int macvlan_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_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_rtnl(dev);
+
+ switch (event) {
+ case NETDEV_UP:
+ case NETDEV_DOWN:
+ 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->gso_max_size = dev->gso_max_size;
+ vlan->dev->gso_max_segs = dev->gso_max_segs;
+ netdev_update_features(vlan->dev);
+ }
+ break;
+ case NETDEV_CHANGEMTU:
+ list_for_each_entry(vlan, &port->vlans, list) {
+ if (vlan->dev->mtu <= dev->mtu)
+ continue;
+ dev_set_mtu(vlan->dev, dev->mtu);
+ }
+ break;
+ case NETDEV_CHANGEADDR:
+ if (!macvlan_passthru(port))
+ return NOTIFY_DONE;
+
+ vlan = list_first_entry_or_null(&port->vlans,
+ struct macvlan_dev,
+ list);
+
+ if (macvlan_sync_address(vlan->dev, dev->dev_addr))
+ return NOTIFY_BAD;
+
+ 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);
+ break;
+ case NETDEV_PRE_TYPE_CHANGE:
+ /* Forbid underlaying device to change its type. */
+ return NOTIFY_BAD;
+
+ case NETDEV_NOTIFY_PEERS:
+ case NETDEV_BONDING_FAILOVER:
+ case NETDEV_RESEND_IGMP:
+ /* Propagate to all vlans */
+ list_for_each_entry(vlan, &port->vlans, list)
+ call_netdevice_notifiers(event, vlan->dev);
+ }
+ 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");