| // 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"); |