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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com>
- */
- #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;
- 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)
- ipvlan_l3s_unregister(port);
- 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_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_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)
- /* 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;
- 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;
- 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);
- 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);
- 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_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 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)
- {
- 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 (!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.
- */
- 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, 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 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 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_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);
- 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) {
- ipvlan->dev->gso_max_size = dev->gso_max_size;
- ipvlan->dev->gso_max_segs = dev->gso_max_segs;
- 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) {
- 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 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");
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