Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1084 insertions, 0 deletions

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
new file mode 100644
index 000000000..57c79f5f2
--- /dev/null
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -0,0 +1,1084 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
+ */
+
+#include <linux/ethtool.h>
+
+#include "ipvlan.h"
+
+static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval,
+				struct netlink_ext_ack *extack)
+{
+	struct ipvl_dev *ipvlan;
+	unsigned int flags;
+	int err;
+
+	ASSERT_RTNL();
+	if (port->mode != nval) {
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+			flags = ipvlan->dev->flags;
+			if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) {
+				err = dev_change_flags(ipvlan->dev,
+						       flags | IFF_NOARP,
+						       extack);
+			} else {
+				err = dev_change_flags(ipvlan->dev,
+						       flags & ~IFF_NOARP,
+						       extack);
+			}
+			if (unlikely(err))
+				goto fail;
+		}
+		if (nval == IPVLAN_MODE_L3S) {
+			/* New mode is L3S */
+			err = ipvlan_l3s_register(port);
+			if (err)
+				goto fail;
+		} else if (port->mode == IPVLAN_MODE_L3S) {
+			/* Old mode was L3S */
+			ipvlan_l3s_unregister(port);
+		}
+		port->mode = nval;
+	}
+	return 0;
+
+fail:
+	/* Undo the flags changes that have been done so far. */
+	list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) {
+		flags = ipvlan->dev->flags;
+		if (port->mode == IPVLAN_MODE_L3 ||
+		    port->mode == IPVLAN_MODE_L3S)
+			dev_change_flags(ipvlan->dev, flags | IFF_NOARP,
+					 NULL);
+		else
+			dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP,
+					 NULL);
+	}
+
+	return err;
+}
+
+static int ipvlan_port_create(struct net_device *dev)
+{
+	struct ipvl_port *port;
+	int err, idx;
+
+	port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL);
+	if (!port)
+		return -ENOMEM;
+
+	write_pnet(&port->pnet, dev_net(dev));
+	port->dev = dev;
+	port->mode = IPVLAN_MODE_L3;
+	INIT_LIST_HEAD(&port->ipvlans);
+	for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++)
+		INIT_HLIST_HEAD(&port->hlhead[idx]);
+
+	skb_queue_head_init(&port->backlog);
+	INIT_WORK(&port->wq, ipvlan_process_multicast);
+	ida_init(&port->ida);
+	port->dev_id_start = 1;
+
+	err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
+	if (err)
+		goto err;
+
+	netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
+	return 0;
+
+err:
+	kfree(port);
+	return err;
+}
+
+static void ipvlan_port_destroy(struct net_device *dev)
+{
+	struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
+	struct sk_buff *skb;
+
+	netdev_put(dev, &port->dev_tracker);
+	if (port->mode == IPVLAN_MODE_L3S)
+		ipvlan_l3s_unregister(port);
+	netdev_rx_handler_unregister(dev);
+	cancel_work_sync(&port->wq);
+	while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
+		dev_put(skb->dev);
+		kfree_skb(skb);
+	}
+	ida_destroy(&port->ida);
+	kfree(port);
+}
+
+#define IPVLAN_ALWAYS_ON_OFLOADS \
+	(NETIF_F_SG | NETIF_F_HW_CSUM | \
+	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
+
+#define IPVLAN_ALWAYS_ON \
+	(IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
+
+#define IPVLAN_FEATURES \
+	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
+	 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \
+	 NETIF_F_GRO | NETIF_F_RXCSUM | \
+	 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
+
+	/* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */
+
+#define IPVLAN_STATE_MASK \
+	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
+
+static int ipvlan_init(struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+	struct ipvl_port *port;
+	int err;
+
+	dev->state = (dev->state & ~IPVLAN_STATE_MASK) |
+		     (phy_dev->state & IPVLAN_STATE_MASK);
+	dev->features = phy_dev->features & IPVLAN_FEATURES;
+	dev->features |= IPVLAN_ALWAYS_ON;
+	dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
+	dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
+	dev->hw_enc_features |= dev->features;
+	netif_inherit_tso_max(dev, phy_dev);
+	dev->hard_header_len = phy_dev->hard_header_len;
+
+	netdev_lockdep_set_classes(dev);
+
+	ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats);
+	if (!ipvlan->pcpu_stats)
+		return -ENOMEM;
+
+	if (!netif_is_ipvlan_port(phy_dev)) {
+		err = ipvlan_port_create(phy_dev);
+		if (err < 0) {
+			free_percpu(ipvlan->pcpu_stats);
+			return err;
+		}
+	}
+	port = ipvlan_port_get_rtnl(phy_dev);
+	port->count += 1;
+	return 0;
+}
+
+static void ipvlan_uninit(struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+	struct ipvl_port *port;
+
+	free_percpu(ipvlan->pcpu_stats);
+
+	port = ipvlan_port_get_rtnl(phy_dev);
+	port->count -= 1;
+	if (!port->count)
+		ipvlan_port_destroy(port->dev);
+}
+
+static int ipvlan_open(struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct ipvl_addr *addr;
+
+	if (ipvlan->port->mode == IPVLAN_MODE_L3 ||
+	    ipvlan->port->mode == IPVLAN_MODE_L3S)
+		dev->flags |= IFF_NOARP;
+	else
+		dev->flags &= ~IFF_NOARP;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
+		ipvlan_ht_addr_add(ipvlan, addr);
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static int ipvlan_stop(struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+	struct ipvl_addr *addr;
+
+	dev_uc_unsync(phy_dev, dev);
+	dev_mc_unsync(phy_dev, dev);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(addr, &ipvlan->addrs, anode)
+		ipvlan_ht_addr_del(addr);
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb,
+				     struct net_device *dev)
+{
+	const struct ipvl_dev *ipvlan = netdev_priv(dev);
+	int skblen = skb->len;
+	int ret;
+
+	ret = ipvlan_queue_xmit(skb, dev);
+	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
+		struct ipvl_pcpu_stats *pcptr;
+
+		pcptr = this_cpu_ptr(ipvlan->pcpu_stats);
+
+		u64_stats_update_begin(&pcptr->syncp);
+		u64_stats_inc(&pcptr->tx_pkts);
+		u64_stats_add(&pcptr->tx_bytes, skblen);
+		u64_stats_update_end(&pcptr->syncp);
+	} else {
+		this_cpu_inc(ipvlan->pcpu_stats->tx_drps);
+	}
+	return ret;
+}
+
+static netdev_features_t ipvlan_fix_features(struct net_device *dev,
+					     netdev_features_t features)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	features |= NETIF_F_ALL_FOR_ALL;
+	features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES);
+	features = netdev_increment_features(ipvlan->phy_dev->features,
+					     features, features);
+	features |= IPVLAN_ALWAYS_ON;
+	features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON);
+
+	return features;
+}
+
+static void ipvlan_change_rx_flags(struct net_device *dev, int change)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+
+	if (change & IFF_ALLMULTI)
+		dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
+}
+
+static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
+		bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE);
+	} else {
+		struct netdev_hw_addr *ha;
+		DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE);
+
+		bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE);
+		netdev_for_each_mc_addr(ha, dev)
+			__set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
+
+		/* Turn-on broadcast bit irrespective of address family,
+		 * since broadcast is deferred to a work-queue, hence no
+		 * impact on fast-path processing.
+		 */
+		__set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
+
+		bitmap_copy(ipvlan->mac_filters, mc_filters,
+			    IPVLAN_MAC_FILTER_SIZE);
+	}
+	dev_uc_sync(ipvlan->phy_dev, dev);
+	dev_mc_sync(ipvlan->phy_dev, dev);
+}
+
+static void ipvlan_get_stats64(struct net_device *dev,
+			       struct rtnl_link_stats64 *s)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (ipvlan->pcpu_stats) {
+		struct ipvl_pcpu_stats *pcptr;
+		u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes;
+		u32 rx_errs = 0, tx_drps = 0;
+		u32 strt;
+		int idx;
+
+		for_each_possible_cpu(idx) {
+			pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx);
+			do {
+				strt = u64_stats_fetch_begin(&pcptr->syncp);
+				rx_pkts = u64_stats_read(&pcptr->rx_pkts);
+				rx_bytes = u64_stats_read(&pcptr->rx_bytes);
+				rx_mcast = u64_stats_read(&pcptr->rx_mcast);
+				tx_pkts = u64_stats_read(&pcptr->tx_pkts);
+				tx_bytes = u64_stats_read(&pcptr->tx_bytes);
+			} while (u64_stats_fetch_retry(&pcptr->syncp,
+							   strt));
+
+			s->rx_packets += rx_pkts;
+			s->rx_bytes += rx_bytes;
+			s->multicast += rx_mcast;
+			s->tx_packets += tx_pkts;
+			s->tx_bytes += tx_bytes;
+
+			/* u32 values are updated without syncp protection. */
+			rx_errs += READ_ONCE(pcptr->rx_errs);
+			tx_drps += READ_ONCE(pcptr->tx_drps);
+		}
+		s->rx_errors = rx_errs;
+		s->rx_dropped = rx_errs;
+		s->tx_dropped = tx_drps;
+	}
+	s->tx_errors = DEV_STATS_READ(dev, tx_errors);
+}
+
+static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+
+	return vlan_vid_add(phy_dev, proto, vid);
+}
+
+static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
+				   u16 vid)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+
+	vlan_vid_del(phy_dev, proto, vid);
+	return 0;
+}
+
+static int ipvlan_get_iflink(const struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	return ipvlan->phy_dev->ifindex;
+}
+
+static const struct net_device_ops ipvlan_netdev_ops = {
+	.ndo_init		= ipvlan_init,
+	.ndo_uninit		= ipvlan_uninit,
+	.ndo_open		= ipvlan_open,
+	.ndo_stop		= ipvlan_stop,
+	.ndo_start_xmit		= ipvlan_start_xmit,
+	.ndo_fix_features	= ipvlan_fix_features,
+	.ndo_change_rx_flags	= ipvlan_change_rx_flags,
+	.ndo_set_rx_mode	= ipvlan_set_multicast_mac_filter,
+	.ndo_get_stats64	= ipvlan_get_stats64,
+	.ndo_vlan_rx_add_vid	= ipvlan_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid	= ipvlan_vlan_rx_kill_vid,
+	.ndo_get_iflink		= ipvlan_get_iflink,
+};
+
+static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
+			      unsigned short type, const void *daddr,
+			      const void *saddr, unsigned len)
+{
+	const struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct net_device *phy_dev = ipvlan->phy_dev;
+
+	/* TODO Probably use a different field than dev_addr so that the
+	 * mac-address on the virtual device is portable and can be carried
+	 * while the packets use the mac-addr on the physical device.
+	 */
+	return dev_hard_header(skb, phy_dev, type, daddr,
+			       saddr ? : phy_dev->dev_addr, len);
+}
+
+static const struct header_ops ipvlan_header_ops = {
+	.create  	= ipvlan_hard_header,
+	.parse		= eth_header_parse,
+	.cache		= eth_header_cache,
+	.cache_update	= eth_header_cache_update,
+};
+
+static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
+{
+	ipvlan->dev->mtu = dev->mtu;
+}
+
+static bool netif_is_ipvlan(const struct net_device *dev)
+{
+	/* both ipvlan and ipvtap devices use the same netdev_ops */
+	return dev->netdev_ops == &ipvlan_netdev_ops;
+}
+
+static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
+					     struct ethtool_link_ksettings *cmd)
+{
+	const struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd);
+}
+
+static void ipvlan_ethtool_get_drvinfo(struct net_device *dev,
+				       struct ethtool_drvinfo *drvinfo)
+{
+	strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
+	strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version));
+}
+
+static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev)
+{
+	const struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	return ipvlan->msg_enable;
+}
+
+static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	ipvlan->msg_enable = value;
+}
+
+static const struct ethtool_ops ipvlan_ethtool_ops = {
+	.get_link	= ethtool_op_get_link,
+	.get_link_ksettings	= ipvlan_ethtool_get_link_ksettings,
+	.get_drvinfo	= ipvlan_ethtool_get_drvinfo,
+	.get_msglevel	= ipvlan_ethtool_get_msglevel,
+	.set_msglevel	= ipvlan_ethtool_set_msglevel,
+};
+
+static int ipvlan_nl_changelink(struct net_device *dev,
+				struct nlattr *tb[], struct nlattr *data[],
+				struct netlink_ext_ack *extack)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
+	int err = 0;
+
+	if (!data)
+		return 0;
+	if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (data[IFLA_IPVLAN_MODE]) {
+		u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
+
+		err = ipvlan_set_port_mode(port, nmode, extack);
+	}
+
+	if (!err && data[IFLA_IPVLAN_FLAGS]) {
+		u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
+
+		if (flags & IPVLAN_F_PRIVATE)
+			ipvlan_mark_private(port);
+		else
+			ipvlan_clear_private(port);
+
+		if (flags & IPVLAN_F_VEPA)
+			ipvlan_mark_vepa(port);
+		else
+			ipvlan_clear_vepa(port);
+	}
+
+	return err;
+}
+
+static size_t ipvlan_nl_getsize(const struct net_device *dev)
+{
+	return (0
+		+ nla_total_size(2) /* IFLA_IPVLAN_MODE */
+		+ nla_total_size(2) /* IFLA_IPVLAN_FLAGS */
+		);
+}
+
+static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[],
+			      struct netlink_ext_ack *extack)
+{
+	if (!data)
+		return 0;
+
+	if (data[IFLA_IPVLAN_MODE]) {
+		u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
+
+		if (mode >= IPVLAN_MODE_MAX)
+			return -EINVAL;
+	}
+	if (data[IFLA_IPVLAN_FLAGS]) {
+		u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
+
+		/* Only two bits are used at this moment. */
+		if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
+			return -EINVAL;
+		/* Also both flags can't be active at the same time. */
+		if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) ==
+		    (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ipvlan_nl_fillinfo(struct sk_buff *skb,
+			      const struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
+	int ret = -EINVAL;
+
+	if (!port)
+		goto err;
+
+	ret = -EMSGSIZE;
+	if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
+		goto err;
+	if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags))
+		goto err;
+
+	return 0;
+
+err:
+	return ret;
+}
+
+int ipvlan_link_new(struct net *src_net, struct net_device *dev,
+		    struct nlattr *tb[], struct nlattr *data[],
+		    struct netlink_ext_ack *extack)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct ipvl_port *port;
+	struct net_device *phy_dev;
+	int err;
+	u16 mode = IPVLAN_MODE_L3;
+
+	if (!tb[IFLA_LINK])
+		return -EINVAL;
+
+	phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
+	if (!phy_dev)
+		return -ENODEV;
+
+	if (netif_is_ipvlan(phy_dev)) {
+		struct ipvl_dev *tmp = netdev_priv(phy_dev);
+
+		phy_dev = tmp->phy_dev;
+		if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN))
+			return -EPERM;
+	} else if (!netif_is_ipvlan_port(phy_dev)) {
+		/* Exit early if the underlying link is invalid or busy */
+		if (phy_dev->type != ARPHRD_ETHER ||
+		    phy_dev->flags & IFF_LOOPBACK) {
+			netdev_err(phy_dev,
+				   "Master is either lo or non-ether device\n");
+			return -EINVAL;
+		}
+
+		if (netdev_is_rx_handler_busy(phy_dev)) {
+			netdev_err(phy_dev, "Device is already in use.\n");
+			return -EBUSY;
+		}
+	}
+
+	ipvlan->phy_dev = phy_dev;
+	ipvlan->dev = dev;
+	ipvlan->sfeatures = IPVLAN_FEATURES;
+	if (!tb[IFLA_MTU])
+		ipvlan_adjust_mtu(ipvlan, phy_dev);
+	INIT_LIST_HEAD(&ipvlan->addrs);
+	spin_lock_init(&ipvlan->addrs_lock);
+
+	/* TODO Probably put random address here to be presented to the
+	 * world but keep using the physical-dev address for the outgoing
+	 * packets.
+	 */
+	eth_hw_addr_set(dev, phy_dev->dev_addr);
+
+	dev->priv_flags |= IFF_NO_RX_HANDLER;
+
+	err = register_netdevice(dev);
+	if (err < 0)
+		return err;
+
+	/* ipvlan_init() would have created the port, if required */
+	port = ipvlan_port_get_rtnl(phy_dev);
+	ipvlan->port = port;
+
+	/* If the port-id base is at the MAX value, then wrap it around and
+	 * begin from 0x1 again. This may be due to a busy system where lots
+	 * of slaves are getting created and deleted.
+	 */
+	if (port->dev_id_start == 0xFFFE)
+		port->dev_id_start = 0x1;
+
+	/* Since L2 address is shared among all IPvlan slaves including
+	 * master, use unique 16 bit dev-ids to diffentiate among them.
+	 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
+	 * slave link [see addrconf_ifid_eui48()].
+	 */
+	err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE,
+			     GFP_KERNEL);
+	if (err < 0)
+		err = ida_simple_get(&port->ida, 0x1, port->dev_id_start,
+				     GFP_KERNEL);
+	if (err < 0)
+		goto unregister_netdev;
+	dev->dev_id = err;
+
+	/* Increment id-base to the next slot for the future assignment */
+	port->dev_id_start = err + 1;
+
+	err = netdev_upper_dev_link(phy_dev, dev, extack);
+	if (err)
+		goto remove_ida;
+
+	/* Flags are per port and latest update overrides. User has
+	 * to be consistent in setting it just like the mode attribute.
+	 */
+	if (data && data[IFLA_IPVLAN_FLAGS])
+		port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]);
+
+	if (data && data[IFLA_IPVLAN_MODE])
+		mode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
+
+	err = ipvlan_set_port_mode(port, mode, extack);
+	if (err)
+		goto unlink_netdev;
+
+	list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
+	netif_stacked_transfer_operstate(phy_dev, dev);
+	return 0;
+
+unlink_netdev:
+	netdev_upper_dev_unlink(phy_dev, dev);
+remove_ida:
+	ida_simple_remove(&port->ida, dev->dev_id);
+unregister_netdev:
+	unregister_netdevice(dev);
+	return err;
+}
+EXPORT_SYMBOL_GPL(ipvlan_link_new);
+
+void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct ipvl_addr *addr, *next;
+
+	spin_lock_bh(&ipvlan->addrs_lock);
+	list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) {
+		ipvlan_ht_addr_del(addr);
+		list_del_rcu(&addr->anode);
+		kfree_rcu(addr, rcu);
+	}
+	spin_unlock_bh(&ipvlan->addrs_lock);
+
+	ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
+	list_del_rcu(&ipvlan->pnode);
+	unregister_netdevice_queue(dev, head);
+	netdev_upper_dev_unlink(ipvlan->phy_dev, dev);
+}
+EXPORT_SYMBOL_GPL(ipvlan_link_delete);
+
+void ipvlan_link_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	dev->max_mtu = ETH_MAX_MTU;
+	dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
+	dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
+	dev->netdev_ops = &ipvlan_netdev_ops;
+	dev->needs_free_netdev = true;
+	dev->header_ops = &ipvlan_header_ops;
+	dev->ethtool_ops = &ipvlan_ethtool_ops;
+}
+EXPORT_SYMBOL_GPL(ipvlan_link_setup);
+
+static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] =
+{
+	[IFLA_IPVLAN_MODE] = { .type = NLA_U16 },
+	[IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 },
+};
+
+static struct net *ipvlan_get_link_net(const struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	return dev_net(ipvlan->phy_dev);
+}
+
+static struct rtnl_link_ops ipvlan_link_ops = {
+	.kind		= "ipvlan",
+	.priv_size	= sizeof(struct ipvl_dev),
+
+	.setup		= ipvlan_link_setup,
+	.newlink	= ipvlan_link_new,
+	.dellink	= ipvlan_link_delete,
+	.get_link_net   = ipvlan_get_link_net,
+};
+
+int ipvlan_link_register(struct rtnl_link_ops *ops)
+{
+	ops->get_size	= ipvlan_nl_getsize;
+	ops->policy	= ipvlan_nl_policy;
+	ops->validate	= ipvlan_nl_validate;
+	ops->fill_info	= ipvlan_nl_fillinfo;
+	ops->changelink = ipvlan_nl_changelink;
+	ops->maxtype	= IFLA_IPVLAN_MAX;
+	return rtnl_link_register(ops);
+}
+EXPORT_SYMBOL_GPL(ipvlan_link_register);
+
+static int ipvlan_device_event(struct notifier_block *unused,
+			       unsigned long event, void *ptr)
+{
+	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
+	struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct ipvl_dev *ipvlan, *next;
+	struct ipvl_port *port;
+	LIST_HEAD(lst_kill);
+	int err;
+
+	if (!netif_is_ipvlan_port(dev))
+		return NOTIFY_DONE;
+
+	port = ipvlan_port_get_rtnl(dev);
+
+	switch (event) {
+	case NETDEV_UP:
+	case NETDEV_CHANGE:
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode)
+			netif_stacked_transfer_operstate(ipvlan->phy_dev,
+							 ipvlan->dev);
+		break;
+
+	case NETDEV_REGISTER: {
+		struct net *oldnet, *newnet = dev_net(dev);
+
+		oldnet = read_pnet(&port->pnet);
+		if (net_eq(newnet, oldnet))
+			break;
+
+		write_pnet(&port->pnet, newnet);
+
+		if (port->mode == IPVLAN_MODE_L3S)
+			ipvlan_migrate_l3s_hook(oldnet, newnet);
+		break;
+	}
+	case NETDEV_UNREGISTER:
+		if (dev->reg_state != NETREG_UNREGISTERING)
+			break;
+
+		list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode)
+			ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev,
+							    &lst_kill);
+		unregister_netdevice_many(&lst_kill);
+		break;
+
+	case NETDEV_FEAT_CHANGE:
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+			netif_inherit_tso_max(ipvlan->dev, dev);
+			netdev_update_features(ipvlan->dev);
+		}
+		break;
+
+	case NETDEV_CHANGEMTU:
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode)
+			ipvlan_adjust_mtu(ipvlan, dev);
+		break;
+
+	case NETDEV_PRE_CHANGEADDR:
+		prechaddr_info = ptr;
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+			err = dev_pre_changeaddr_notify(ipvlan->dev,
+						    prechaddr_info->dev_addr,
+						    extack);
+			if (err)
+				return notifier_from_errno(err);
+		}
+		break;
+
+	case NETDEV_CHANGEADDR:
+		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+			eth_hw_addr_set(ipvlan->dev, dev->dev_addr);
+			call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
+		}
+		break;
+
+	case NETDEV_PRE_TYPE_CHANGE:
+		/* Forbid underlying device to change its type. */
+		return NOTIFY_BAD;
+	}
+	return NOTIFY_DONE;
+}
+
+/* the caller must held the addrs lock */
+static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
+{
+	struct ipvl_addr *addr;
+
+	addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC);
+	if (!addr)
+		return -ENOMEM;
+
+	addr->master = ipvlan;
+	if (!is_v6) {
+		memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr));
+		addr->atype = IPVL_IPV4;
+#if IS_ENABLED(CONFIG_IPV6)
+	} else {
+		memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr));
+		addr->atype = IPVL_IPV6;
+#endif
+	}
+
+	list_add_tail_rcu(&addr->anode, &ipvlan->addrs);
+
+	/* If the interface is not up, the address will be added to the hash
+	 * list by ipvlan_open.
+	 */
+	if (netif_running(ipvlan->dev))
+		ipvlan_ht_addr_add(ipvlan, addr);
+
+	return 0;
+}
+
+static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6)
+{
+	struct ipvl_addr *addr;
+
+	spin_lock_bh(&ipvlan->addrs_lock);
+	addr = ipvlan_find_addr(ipvlan, iaddr, is_v6);
+	if (!addr) {
+		spin_unlock_bh(&ipvlan->addrs_lock);
+		return;
+	}
+
+	ipvlan_ht_addr_del(addr);
+	list_del_rcu(&addr->anode);
+	spin_unlock_bh(&ipvlan->addrs_lock);
+	kfree_rcu(addr, rcu);
+}
+
+static bool ipvlan_is_valid_dev(const struct net_device *dev)
+{
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (!netif_is_ipvlan(dev))
+		return false;
+
+	if (!ipvlan || !ipvlan->port)
+		return false;
+
+	return true;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
+{
+	int ret = -EINVAL;
+
+	spin_lock_bh(&ipvlan->addrs_lock);
+	if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true))
+		netif_err(ipvlan, ifup, ipvlan->dev,
+			  "Failed to add IPv6=%pI6c addr for %s intf\n",
+			  ip6_addr, ipvlan->dev->name);
+	else
+		ret = ipvlan_add_addr(ipvlan, ip6_addr, true);
+	spin_unlock_bh(&ipvlan->addrs_lock);
+	return ret;
+}
+
+static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr)
+{
+	return ipvlan_del_addr(ipvlan, ip6_addr, true);
+}
+
+static int ipvlan_addr6_event(struct notifier_block *unused,
+			      unsigned long event, void *ptr)
+{
+	struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr;
+	struct net_device *dev = (struct net_device *)if6->idev->dev;
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (!ipvlan_is_valid_dev(dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		if (ipvlan_add_addr6(ipvlan, &if6->addr))
+			return NOTIFY_BAD;
+		break;
+
+	case NETDEV_DOWN:
+		ipvlan_del_addr6(ipvlan, &if6->addr);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int ipvlan_addr6_validator_event(struct notifier_block *unused,
+					unsigned long event, void *ptr)
+{
+	struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr;
+	struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev;
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (!ipvlan_is_valid_dev(dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
+			NL_SET_ERR_MSG(i6vi->extack,
+				       "Address already assigned to an ipvlan device");
+			return notifier_from_errno(-EADDRINUSE);
+		}
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+#endif
+
+static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
+{
+	int ret = -EINVAL;
+
+	spin_lock_bh(&ipvlan->addrs_lock);
+	if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false))
+		netif_err(ipvlan, ifup, ipvlan->dev,
+			  "Failed to add IPv4=%pI4 on %s intf.\n",
+			  ip4_addr, ipvlan->dev->name);
+	else
+		ret = ipvlan_add_addr(ipvlan, ip4_addr, false);
+	spin_unlock_bh(&ipvlan->addrs_lock);
+	return ret;
+}
+
+static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
+{
+	return ipvlan_del_addr(ipvlan, ip4_addr, false);
+}
+
+static int ipvlan_addr4_event(struct notifier_block *unused,
+			      unsigned long event, void *ptr)
+{
+	struct in_ifaddr *if4 = (struct in_ifaddr *)ptr;
+	struct net_device *dev = (struct net_device *)if4->ifa_dev->dev;
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+	struct in_addr ip4_addr;
+
+	if (!ipvlan_is_valid_dev(dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		ip4_addr.s_addr = if4->ifa_address;
+		if (ipvlan_add_addr4(ipvlan, &ip4_addr))
+			return NOTIFY_BAD;
+		break;
+
+	case NETDEV_DOWN:
+		ip4_addr.s_addr = if4->ifa_address;
+		ipvlan_del_addr4(ipvlan, &ip4_addr);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int ipvlan_addr4_validator_event(struct notifier_block *unused,
+					unsigned long event, void *ptr)
+{
+	struct in_validator_info *ivi = (struct in_validator_info *)ptr;
+	struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev;
+	struct ipvl_dev *ipvlan = netdev_priv(dev);
+
+	if (!ipvlan_is_valid_dev(dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
+			NL_SET_ERR_MSG(ivi->extack,
+				       "Address already assigned to an ipvlan device");
+			return notifier_from_errno(-EADDRINUSE);
+		}
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = {
+	.notifier_call = ipvlan_addr4_event,
+};
+
+static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = {
+	.notifier_call = ipvlan_addr4_validator_event,
+};
+
+static struct notifier_block ipvlan_notifier_block __read_mostly = {
+	.notifier_call = ipvlan_device_event,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = {
+	.notifier_call = ipvlan_addr6_event,
+};
+
+static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = {
+	.notifier_call = ipvlan_addr6_validator_event,
+};
+#endif
+
+static int __init ipvlan_init_module(void)
+{
+	int err;
+
+	ipvlan_init_secret();
+	register_netdevice_notifier(&ipvlan_notifier_block);
+#if IS_ENABLED(CONFIG_IPV6)
+	register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
+	register_inet6addr_validator_notifier(
+	    &ipvlan_addr6_vtor_notifier_block);
+#endif
+	register_inetaddr_notifier(&ipvlan_addr4_notifier_block);
+	register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block);
+
+	err = ipvlan_l3s_init();
+	if (err < 0)
+		goto error;
+
+	err = ipvlan_link_register(&ipvlan_link_ops);
+	if (err < 0) {
+		ipvlan_l3s_cleanup();
+		goto error;
+	}
+
+	return 0;
+error:
+	unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
+	unregister_inetaddr_validator_notifier(
+	    &ipvlan_addr4_vtor_notifier_block);
+#if IS_ENABLED(CONFIG_IPV6)
+	unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
+	unregister_inet6addr_validator_notifier(
+	    &ipvlan_addr6_vtor_notifier_block);
+#endif
+	unregister_netdevice_notifier(&ipvlan_notifier_block);
+	return err;
+}
+
+static void __exit ipvlan_cleanup_module(void)
+{
+	rtnl_link_unregister(&ipvlan_link_ops);
+	ipvlan_l3s_cleanup();
+	unregister_netdevice_notifier(&ipvlan_notifier_block);
+	unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block);
+	unregister_inetaddr_validator_notifier(
+	    &ipvlan_addr4_vtor_notifier_block);
+#if IS_ENABLED(CONFIG_IPV6)
+	unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block);
+	unregister_inet6addr_validator_notifier(
+	    &ipvlan_addr6_vtor_notifier_block);
+#endif
+}
+
+module_init(ipvlan_init_module);
+module_exit(ipvlan_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
+MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs");
+MODULE_ALIAS_RTNL_LINK("ipvlan");