v4.19.13 snapshot.
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
new file mode 100644
index 0000000..4a94956
--- /dev/null
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -0,0 +1,1128 @@
+/* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
+ *
+ * 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.
+ *
+ */
+
+#include "ipvlan.h"
+
+static unsigned int ipvlan_netid __read_mostly;
+
+struct ipvlan_netns {
+ unsigned int ipvl_nf_hook_refcnt;
+};
+
+static const struct nf_hook_ops ipvl_nfops[] = {
+ {
+ .hook = ipvlan_nf_input,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = INT_MAX,
+ },
+#if IS_ENABLED(CONFIG_IPV6)
+ {
+ .hook = ipvlan_nf_input,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = INT_MAX,
+ },
+#endif
+};
+
+static const struct l3mdev_ops ipvl_l3mdev_ops = {
+ .l3mdev_l3_rcv = ipvlan_l3_rcv,
+};
+
+static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev)
+{
+ ipvlan->dev->mtu = dev->mtu;
+}
+
+static int ipvlan_register_nf_hook(struct net *net)
+{
+ struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
+ int err = 0;
+
+ if (!vnet->ipvl_nf_hook_refcnt) {
+ err = nf_register_net_hooks(net, ipvl_nfops,
+ ARRAY_SIZE(ipvl_nfops));
+ if (!err)
+ vnet->ipvl_nf_hook_refcnt = 1;
+ } else {
+ vnet->ipvl_nf_hook_refcnt++;
+ }
+
+ return err;
+}
+
+static void ipvlan_unregister_nf_hook(struct net *net)
+{
+ struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
+
+ if (WARN_ON(!vnet->ipvl_nf_hook_refcnt))
+ return;
+
+ vnet->ipvl_nf_hook_refcnt--;
+ if (!vnet->ipvl_nf_hook_refcnt)
+ nf_unregister_net_hooks(net, ipvl_nfops,
+ ARRAY_SIZE(ipvl_nfops));
+}
+
+static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval)
+{
+ struct ipvl_dev *ipvlan;
+ struct net_device *mdev = port->dev;
+ 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);
+ } else {
+ err = dev_change_flags(ipvlan->dev,
+ flags & ~IFF_NOARP);
+ }
+ if (unlikely(err))
+ goto fail;
+ }
+ if (nval == IPVLAN_MODE_L3S) {
+ /* New mode is L3S */
+ err = ipvlan_register_nf_hook(read_pnet(&port->pnet));
+ if (!err) {
+ mdev->l3mdev_ops = &ipvl_l3mdev_ops;
+ mdev->priv_flags |= IFF_L3MDEV_MASTER;
+ } else
+ goto fail;
+ } else if (port->mode == IPVLAN_MODE_L3S) {
+ /* Old mode was L3S */
+ mdev->priv_flags &= ~IFF_L3MDEV_MASTER;
+ ipvlan_unregister_nf_hook(read_pnet(&port->pnet));
+ mdev->l3mdev_ops = NULL;
+ }
+ 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);
+ else
+ dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP);
+ }
+
+ 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;
+
+ 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;
+
+ if (port->mode == IPVLAN_MODE_L3S) {
+ dev->priv_flags &= ~IFF_L3MDEV_MASTER;
+ ipvlan_unregister_nf_hook(dev_net(dev));
+ dev->l3mdev_ops = NULL;
+ }
+ netdev_rx_handler_unregister(dev);
+ cancel_work_sync(&port->wq);
+ while ((skb = __skb_dequeue(&port->backlog)) != NULL) {
+ if (skb->dev)
+ dev_put(skb->dev);
+ kfree_skb(skb);
+ }
+ ida_destroy(&port->ida);
+ kfree(port);
+}
+
+#define IPVLAN_FEATURES \
+ (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
+ NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \
+ 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 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 |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED;
+ dev->gso_max_size = phy_dev->gso_max_size;
+ dev->gso_max_segs = phy_dev->gso_max_segs;
+ 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 net_device *phy_dev = ipvlan->phy_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 dev_uc_add(phy_dev, phy_dev->dev_addr);
+}
+
+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);
+
+ dev_uc_del(phy_dev, phy_dev->dev_addr);
+
+ 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);
+ pcptr->tx_pkts++;
+ 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);
+
+ return features & (ipvlan->sfeatures | ~IPVLAN_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_irq(&pcptr->syncp);
+ rx_pkts = pcptr->rx_pkts;
+ rx_bytes = pcptr->rx_bytes;
+ rx_mcast = pcptr->rx_mcast;
+ tx_pkts = pcptr->tx_pkts;
+ tx_bytes = pcptr->tx_bytes;
+ } while (u64_stats_fetch_retry_irq(&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 += pcptr->rx_errs;
+ tx_drps += pcptr->tx_drps;
+ }
+ s->rx_errors = rx_errs;
+ s->rx_dropped = rx_errs;
+ s->tx_dropped = tx_drps;
+ }
+}
+
+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 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)
+{
+ strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver));
+ strlcpy(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 (data[IFLA_IPVLAN_MODE]) {
+ u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]);
+
+ err = ipvlan_set_port_mode(port, nmode);
+ }
+
+ 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_L2 || 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;
+ } 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.
+ */
+ memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
+
+ 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);
+ 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 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,
+};
+
+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 net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct ipvl_dev *ipvlan, *next;
+ struct ipvl_port *port;
+ LIST_HEAD(lst_kill);
+
+ if (!netif_is_ipvlan_port(dev))
+ return NOTIFY_DONE;
+
+ port = ipvlan_port_get_rtnl(dev);
+
+ switch (event) {
+ 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);
+ struct ipvlan_netns *old_vnet;
+
+ oldnet = read_pnet(&port->pnet);
+ if (net_eq(newnet, oldnet))
+ break;
+
+ write_pnet(&port->pnet, newnet);
+
+ old_vnet = net_generic(oldnet, ipvlan_netid);
+ if (!old_vnet->ipvl_nf_hook_refcnt)
+ break;
+
+ ipvlan_register_nf_hook(newnet);
+ ipvlan_unregister_nf_hook(oldnet);
+ 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) {
+ ipvlan->dev->features = dev->features & IPVLAN_FEATURES;
+ ipvlan->dev->gso_max_size = dev->gso_max_size;
+ ipvlan->dev->gso_max_segs = dev->gso_max_segs;
+ netdev_features_change(ipvlan->dev);
+ }
+ break;
+
+ case NETDEV_CHANGEMTU:
+ list_for_each_entry(ipvlan, &port->ipvlans, pnode)
+ ipvlan_adjust_mtu(ipvlan, dev);
+ break;
+
+ case NETDEV_CHANGEADDR:
+ list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+ ether_addr_copy(ipvlan->dev->dev_addr, 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 void ipvlan_ns_exit(struct net *net)
+{
+ struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid);
+
+ if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) {
+ vnet->ipvl_nf_hook_refcnt = 0;
+ nf_unregister_net_hooks(net, ipvl_nfops,
+ ARRAY_SIZE(ipvl_nfops));
+ }
+}
+
+static struct pernet_operations ipvlan_net_ops = {
+ .id = &ipvlan_netid,
+ .size = sizeof(struct ipvlan_netns),
+ .exit = ipvlan_ns_exit,
+};
+
+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 = register_pernet_subsys(&ipvlan_net_ops);
+ if (err < 0)
+ goto error;
+
+ err = ipvlan_link_register(&ipvlan_link_ops);
+ if (err < 0) {
+ unregister_pernet_subsys(&ipvlan_net_ops);
+ 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);
+ unregister_pernet_subsys(&ipvlan_net_ops);
+ 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");