diff options
Diffstat (limited to 'drivers/net/macvlan.c')
| -rw-r--r-- | drivers/net/macvlan.c | 1845 |
1 files changed, 1845 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c new file mode 100644 index 000000000..012830d12 --- /dev/null +++ b/drivers/net/macvlan.c @@ -0,0 +1,1845 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> + * + * The code this is based on carried the following copyright notice: + * --- + * (C) Copyright 2001-2006 + * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com + * Re-worked by Ben Greear <greearb@candelatech.com> + * --- + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/rculist.h> +#include <linux/notifier.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/net_tstamp.h> +#include <linux/ethtool.h> +#include <linux/if_arp.h> +#include <linux/if_vlan.h> +#include <linux/if_link.h> +#include <linux/if_macvlan.h> +#include <linux/hash.h> +#include <linux/workqueue.h> +#include <net/rtnetlink.h> +#include <net/xfrm.h> +#include <linux/netpoll.h> +#include <linux/phy.h> + +#define MACVLAN_HASH_BITS 8 +#define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS) +#define MACVLAN_DEFAULT_BC_QUEUE_LEN 1000 + +#define MACVLAN_F_PASSTHRU 1 +#define MACVLAN_F_ADDRCHANGE 2 + +struct macvlan_port { + struct net_device *dev; + struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; + struct list_head vlans; + struct sk_buff_head bc_queue; + struct work_struct bc_work; + u32 bc_queue_len_used; + u32 flags; + int count; + struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE]; + DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ); + unsigned char perm_addr[ETH_ALEN]; +}; + +struct macvlan_source_entry { + struct hlist_node hlist; + struct macvlan_dev *vlan; + unsigned char addr[6+2] __aligned(sizeof(u16)); + struct rcu_head rcu; +}; + +struct macvlan_skb_cb { + const struct macvlan_dev *src; +}; + +#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0])) + +static void macvlan_port_destroy(struct net_device *dev); +static void update_port_bc_queue_len(struct macvlan_port *port); + +static inline bool macvlan_passthru(const struct macvlan_port *port) +{ + return port->flags & MACVLAN_F_PASSTHRU; +} + +static inline void macvlan_set_passthru(struct macvlan_port *port) +{ + port->flags |= MACVLAN_F_PASSTHRU; +} + +static inline bool macvlan_addr_change(const struct macvlan_port *port) +{ + return port->flags & MACVLAN_F_ADDRCHANGE; +} + +static inline void macvlan_set_addr_change(struct macvlan_port *port) +{ + port->flags |= MACVLAN_F_ADDRCHANGE; +} + +static inline void macvlan_clear_addr_change(struct macvlan_port *port) +{ + port->flags &= ~MACVLAN_F_ADDRCHANGE; +} + +/* Hash Ethernet address */ +static u32 macvlan_eth_hash(const unsigned char *addr) +{ + u64 value = get_unaligned((u64 *)addr); + + /* only want 6 bytes */ +#ifdef __BIG_ENDIAN + value >>= 16; +#else + value <<= 16; +#endif + return hash_64(value, MACVLAN_HASH_BITS); +} + +static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev) +{ + return rcu_dereference(dev->rx_handler_data); +} + +static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev) +{ + return rtnl_dereference(dev->rx_handler_data); +} + +static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, + const unsigned char *addr) +{ + struct macvlan_dev *vlan; + u32 idx = macvlan_eth_hash(addr); + + hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist, + lockdep_rtnl_is_held()) { + if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) + return vlan; + } + return NULL; +} + +static struct macvlan_source_entry *macvlan_hash_lookup_source( + const struct macvlan_dev *vlan, + const unsigned char *addr) +{ + struct macvlan_source_entry *entry; + u32 idx = macvlan_eth_hash(addr); + struct hlist_head *h = &vlan->port->vlan_source_hash[idx]; + + hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) { + if (ether_addr_equal_64bits(entry->addr, addr) && + entry->vlan == vlan) + return entry; + } + return NULL; +} + +static int macvlan_hash_add_source(struct macvlan_dev *vlan, + const unsigned char *addr) +{ + struct macvlan_port *port = vlan->port; + struct macvlan_source_entry *entry; + struct hlist_head *h; + + entry = macvlan_hash_lookup_source(vlan, addr); + if (entry) + return 0; + + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + ether_addr_copy(entry->addr, addr); + entry->vlan = vlan; + h = &port->vlan_source_hash[macvlan_eth_hash(addr)]; + hlist_add_head_rcu(&entry->hlist, h); + vlan->macaddr_count++; + + return 0; +} + +static void macvlan_hash_add(struct macvlan_dev *vlan) +{ + struct macvlan_port *port = vlan->port; + const unsigned char *addr = vlan->dev->dev_addr; + u32 idx = macvlan_eth_hash(addr); + + hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]); +} + +static void macvlan_hash_del_source(struct macvlan_source_entry *entry) +{ + hlist_del_rcu(&entry->hlist); + kfree_rcu(entry, rcu); +} + +static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync) +{ + hlist_del_rcu(&vlan->hlist); + if (sync) + synchronize_rcu(); +} + +static void macvlan_hash_change_addr(struct macvlan_dev *vlan, + const unsigned char *addr) +{ + macvlan_hash_del(vlan, true); + /* Now that we are unhashed it is safe to change the device + * address without confusing packet delivery. + */ + eth_hw_addr_set(vlan->dev, addr); + macvlan_hash_add(vlan); +} + +static bool macvlan_addr_busy(const struct macvlan_port *port, + const unsigned char *addr) +{ + /* Test to see if the specified address is + * currently in use by the underlying device or + * another macvlan. + */ + if (!macvlan_passthru(port) && !macvlan_addr_change(port) && + ether_addr_equal_64bits(port->dev->dev_addr, addr)) + return true; + + if (macvlan_hash_lookup(port, addr)) + return true; + + return false; +} + + +static int macvlan_broadcast_one(struct sk_buff *skb, + const struct macvlan_dev *vlan, + const struct ethhdr *eth, bool local) +{ + struct net_device *dev = vlan->dev; + + if (local) + return __dev_forward_skb(dev, skb); + + skb->dev = dev; + if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) + skb->pkt_type = PACKET_BROADCAST; + else + skb->pkt_type = PACKET_MULTICAST; + + return 0; +} + +static u32 macvlan_hash_mix(const struct macvlan_dev *vlan) +{ + return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT); +} + + +static unsigned int mc_hash(const struct macvlan_dev *vlan, + const unsigned char *addr) +{ + u32 val = __get_unaligned_cpu32(addr + 2); + + val ^= macvlan_hash_mix(vlan); + return hash_32(val, MACVLAN_MC_FILTER_BITS); +} + +static void macvlan_broadcast(struct sk_buff *skb, + const struct macvlan_port *port, + struct net_device *src, + enum macvlan_mode mode) +{ + const struct ethhdr *eth = eth_hdr(skb); + const struct macvlan_dev *vlan; + struct sk_buff *nskb; + unsigned int i; + int err; + unsigned int hash; + + if (skb->protocol == htons(ETH_P_PAUSE)) + return; + + hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) { + if (vlan->dev == src || !(vlan->mode & mode)) + continue; + + hash = mc_hash(vlan, eth->h_dest); + if (!test_bit(hash, vlan->mc_filter)) + continue; + + err = NET_RX_DROP; + nskb = skb_clone(skb, GFP_ATOMIC); + if (likely(nskb)) + err = macvlan_broadcast_one(nskb, vlan, eth, + mode == MACVLAN_MODE_BRIDGE) ?: + netif_rx(nskb); + macvlan_count_rx(vlan, skb->len + ETH_HLEN, + err == NET_RX_SUCCESS, true); + } +} + +static void macvlan_process_broadcast(struct work_struct *w) +{ + struct macvlan_port *port = container_of(w, struct macvlan_port, + bc_work); + struct sk_buff *skb; + struct sk_buff_head list; + + __skb_queue_head_init(&list); + + spin_lock_bh(&port->bc_queue.lock); + skb_queue_splice_tail_init(&port->bc_queue, &list); + spin_unlock_bh(&port->bc_queue.lock); + + while ((skb = __skb_dequeue(&list))) { + const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; + + rcu_read_lock(); + + if (!src) + /* frame comes from an external address */ + macvlan_broadcast(skb, port, NULL, + MACVLAN_MODE_PRIVATE | + MACVLAN_MODE_VEPA | + MACVLAN_MODE_PASSTHRU| + MACVLAN_MODE_BRIDGE); + else if (src->mode == MACVLAN_MODE_VEPA) + /* flood to everyone except source */ + macvlan_broadcast(skb, port, src->dev, + MACVLAN_MODE_VEPA | + MACVLAN_MODE_BRIDGE); + else + /* + * flood only to VEPA ports, bridge ports + * already saw the frame on the way out. + */ + macvlan_broadcast(skb, port, src->dev, + MACVLAN_MODE_VEPA); + + rcu_read_unlock(); + + if (src) + dev_put(src->dev); + consume_skb(skb); + + cond_resched(); + } +} + +static void macvlan_broadcast_enqueue(struct macvlan_port *port, + const struct macvlan_dev *src, + struct sk_buff *skb) +{ + struct sk_buff *nskb; + int err = -ENOMEM; + + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + goto err; + + MACVLAN_SKB_CB(nskb)->src = src; + + spin_lock(&port->bc_queue.lock); + if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) { + if (src) + dev_hold(src->dev); + __skb_queue_tail(&port->bc_queue, nskb); + err = 0; + } + spin_unlock(&port->bc_queue.lock); + + queue_work(system_unbound_wq, &port->bc_work); + + if (err) + goto free_nskb; + + return; + +free_nskb: + kfree_skb(nskb); +err: + dev_core_stats_rx_dropped_inc(skb->dev); +} + +static void macvlan_flush_sources(struct macvlan_port *port, + struct macvlan_dev *vlan) +{ + struct macvlan_source_entry *entry; + struct hlist_node *next; + int i; + + hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist) + if (entry->vlan == vlan) + macvlan_hash_del_source(entry); + + vlan->macaddr_count = 0; +} + +static void macvlan_forward_source_one(struct sk_buff *skb, + struct macvlan_dev *vlan) +{ + struct sk_buff *nskb; + struct net_device *dev; + int len; + int ret; + + dev = vlan->dev; + if (unlikely(!(dev->flags & IFF_UP))) + return; + + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + return; + + len = nskb->len + ETH_HLEN; + nskb->dev = dev; + + if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr)) + nskb->pkt_type = PACKET_HOST; + + ret = __netif_rx(nskb); + macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); +} + +static bool macvlan_forward_source(struct sk_buff *skb, + struct macvlan_port *port, + const unsigned char *addr) +{ + struct macvlan_source_entry *entry; + u32 idx = macvlan_eth_hash(addr); + struct hlist_head *h = &port->vlan_source_hash[idx]; + bool consume = false; + + hlist_for_each_entry_rcu(entry, h, hlist) { + if (ether_addr_equal_64bits(entry->addr, addr)) { + if (entry->vlan->flags & MACVLAN_FLAG_NODST) + consume = true; + macvlan_forward_source_one(skb, entry->vlan); + } + } + + return consume; +} + +/* called under rcu_read_lock() from netif_receive_skb */ +static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) +{ + struct macvlan_port *port; + struct sk_buff *skb = *pskb; + const struct ethhdr *eth = eth_hdr(skb); + const struct macvlan_dev *vlan; + const struct macvlan_dev *src; + struct net_device *dev; + unsigned int len = 0; + int ret; + rx_handler_result_t handle_res; + + /* Packets from dev_loopback_xmit() do not have L2 header, bail out */ + if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) + return RX_HANDLER_PASS; + + port = macvlan_port_get_rcu(skb->dev); + if (is_multicast_ether_addr(eth->h_dest)) { + unsigned int hash; + + skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); + if (!skb) + return RX_HANDLER_CONSUMED; + *pskb = skb; + eth = eth_hdr(skb); + if (macvlan_forward_source(skb, port, eth->h_source)) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + src = macvlan_hash_lookup(port, eth->h_source); + if (src && src->mode != MACVLAN_MODE_VEPA && + src->mode != MACVLAN_MODE_BRIDGE) { + /* forward to original port. */ + vlan = src; + ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?: + __netif_rx(skb); + handle_res = RX_HANDLER_CONSUMED; + goto out; + } + + hash = mc_hash(NULL, eth->h_dest); + if (test_bit(hash, port->mc_filter)) + macvlan_broadcast_enqueue(port, src, skb); + + return RX_HANDLER_PASS; + } + + if (macvlan_forward_source(skb, port, eth->h_source)) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + if (macvlan_passthru(port)) + vlan = list_first_or_null_rcu(&port->vlans, + struct macvlan_dev, list); + else + vlan = macvlan_hash_lookup(port, eth->h_dest); + if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE) + return RX_HANDLER_PASS; + + dev = vlan->dev; + if (unlikely(!(dev->flags & IFF_UP))) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + len = skb->len + ETH_HLEN; + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) { + ret = NET_RX_DROP; + handle_res = RX_HANDLER_CONSUMED; + goto out; + } + + *pskb = skb; + skb->dev = dev; + skb->pkt_type = PACKET_HOST; + + ret = NET_RX_SUCCESS; + handle_res = RX_HANDLER_ANOTHER; +out: + macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false); + return handle_res; +} + +static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev) +{ + const struct macvlan_dev *vlan = netdev_priv(dev); + const struct macvlan_port *port = vlan->port; + const struct macvlan_dev *dest; + + if (vlan->mode == MACVLAN_MODE_BRIDGE) { + const struct ethhdr *eth = skb_eth_hdr(skb); + + /* send to other bridge ports directly */ + if (is_multicast_ether_addr(eth->h_dest)) { + skb_reset_mac_header(skb); + macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE); + goto xmit_world; + } + + dest = macvlan_hash_lookup(port, eth->h_dest); + if (dest && dest->mode == MACVLAN_MODE_BRIDGE) { + /* send to lowerdev first for its network taps */ + dev_forward_skb(vlan->lowerdev, skb); + + return NET_XMIT_SUCCESS; + } + } +xmit_world: + skb->dev = vlan->lowerdev; + return dev_queue_xmit_accel(skb, + netdev_get_sb_channel(dev) ? dev : NULL); +} + +static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) +{ +#ifdef CONFIG_NET_POLL_CONTROLLER + return netpoll_send_skb(vlan->netpoll, skb); +#else + BUG(); + return NETDEV_TX_OK; +#endif +} + +static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + unsigned int len = skb->len; + int ret; + + if (unlikely(netpoll_tx_running(dev))) + return macvlan_netpoll_send_skb(vlan, skb); + + ret = macvlan_queue_xmit(skb, dev); + + if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { + struct vlan_pcpu_stats *pcpu_stats; + + pcpu_stats = this_cpu_ptr(vlan->pcpu_stats); + u64_stats_update_begin(&pcpu_stats->syncp); + u64_stats_inc(&pcpu_stats->tx_packets); + u64_stats_add(&pcpu_stats->tx_bytes, len); + u64_stats_update_end(&pcpu_stats->syncp); + } else { + this_cpu_inc(vlan->pcpu_stats->tx_dropped); + } + return ret; +} + +static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned len) +{ + const struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + return dev_hard_header(skb, lowerdev, type, daddr, + saddr ? : dev->dev_addr, len); +} + +static const struct header_ops macvlan_hard_header_ops = { + .create = macvlan_hard_header, + .parse = eth_header_parse, + .cache = eth_header_cache, + .cache_update = eth_header_cache_update, +}; + +static int macvlan_open(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + int err; + + if (macvlan_passthru(vlan->port)) { + if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { + err = dev_set_promiscuity(lowerdev, 1); + if (err < 0) + goto out; + } + goto hash_add; + } + + err = -EADDRINUSE; + if (macvlan_addr_busy(vlan->port, dev->dev_addr)) + goto out; + + /* Attempt to populate accel_priv which is used to offload the L2 + * forwarding requests for unicast packets. + */ + if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD) + vlan->accel_priv = + lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); + + /* If earlier attempt to offload failed, or accel_priv is not + * populated we must add the unicast address to the lower device. + */ + if (IS_ERR_OR_NULL(vlan->accel_priv)) { + vlan->accel_priv = NULL; + err = dev_uc_add(lowerdev, dev->dev_addr); + if (err < 0) + goto out; + } + + if (dev->flags & IFF_ALLMULTI) { + err = dev_set_allmulti(lowerdev, 1); + if (err < 0) + goto del_unicast; + } + + if (dev->flags & IFF_PROMISC) { + err = dev_set_promiscuity(lowerdev, 1); + if (err < 0) + goto clear_multi; + } + +hash_add: + macvlan_hash_add(vlan); + return 0; + +clear_multi: + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(lowerdev, -1); +del_unicast: + if (vlan->accel_priv) { + lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, + vlan->accel_priv); + vlan->accel_priv = NULL; + } else { + dev_uc_del(lowerdev, dev->dev_addr); + } +out: + return err; +} + +static int macvlan_stop(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + if (vlan->accel_priv) { + lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, + vlan->accel_priv); + vlan->accel_priv = NULL; + } + + dev_uc_unsync(lowerdev, dev); + dev_mc_unsync(lowerdev, dev); + + if (macvlan_passthru(vlan->port)) { + if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) + dev_set_promiscuity(lowerdev, -1); + goto hash_del; + } + + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(lowerdev, -1); + + if (dev->flags & IFF_PROMISC) + dev_set_promiscuity(lowerdev, -1); + + dev_uc_del(lowerdev, dev->dev_addr); + +hash_del: + macvlan_hash_del(vlan, !dev->dismantle); + return 0; +} + +static int macvlan_sync_address(struct net_device *dev, + const unsigned char *addr) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + struct macvlan_port *port = vlan->port; + int err; + + if (!(dev->flags & IFF_UP)) { + /* Just copy in the new address */ + eth_hw_addr_set(dev, addr); + } else { + /* Rehash and update the device filters */ + if (macvlan_addr_busy(vlan->port, addr)) + return -EADDRINUSE; + + if (!macvlan_passthru(port)) { + err = dev_uc_add(lowerdev, addr); + if (err) + return err; + + dev_uc_del(lowerdev, dev->dev_addr); + } + + macvlan_hash_change_addr(vlan, addr); + } + if (macvlan_passthru(port) && !macvlan_addr_change(port)) { + /* Since addr_change isn't set, we are here due to lower + * device change. Save the lower-dev address so we can + * restore it later. + */ + ether_addr_copy(vlan->port->perm_addr, + lowerdev->dev_addr); + } + macvlan_clear_addr_change(port); + return 0; +} + +static int macvlan_set_mac_address(struct net_device *dev, void *p) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct sockaddr *addr = p; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + /* If the addresses are the same, this is a no-op */ + if (ether_addr_equal(dev->dev_addr, addr->sa_data)) + return 0; + + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + macvlan_set_addr_change(vlan->port); + return dev_set_mac_address(vlan->lowerdev, addr, NULL); + } + + if (macvlan_addr_busy(vlan->port, addr->sa_data)) + return -EADDRINUSE; + + return macvlan_sync_address(dev, addr->sa_data); +} + +static void macvlan_change_rx_flags(struct net_device *dev, int change) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + if (dev->flags & IFF_UP) { + if (change & IFF_ALLMULTI) + dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); + if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC) + dev_set_promiscuity(lowerdev, + dev->flags & IFF_PROMISC ? 1 : -1); + + } +} + +static void macvlan_compute_filter(unsigned long *mc_filter, + struct net_device *dev, + struct macvlan_dev *vlan) +{ + if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { + bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ); + } else { + struct netdev_hw_addr *ha; + DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); + + bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); + netdev_for_each_mc_addr(ha, dev) { + __set_bit(mc_hash(vlan, ha->addr), filter); + } + + __set_bit(mc_hash(vlan, dev->broadcast), filter); + + bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ); + } +} + +static void macvlan_set_mac_lists(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + macvlan_compute_filter(vlan->mc_filter, dev, vlan); + + dev_uc_sync(vlan->lowerdev, dev); + dev_mc_sync(vlan->lowerdev, dev); + + /* This is slightly inaccurate as we're including the subscription + * list of vlan->lowerdev too. + * + * Bug alert: This only works if everyone has the same broadcast + * address as lowerdev. As soon as someone changes theirs this + * will break. + * + * However, this is already broken as when you change your broadcast + * address we don't get called. + * + * The solution is to maintain a list of broadcast addresses like + * we do for uc/mc, if you care. + */ + macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL); +} + +static int macvlan_change_mtu(struct net_device *dev, int new_mtu) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + if (vlan->lowerdev->mtu < new_mtu) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + +static int macvlan_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + struct net_device *real_dev = macvlan_dev_real_dev(dev); + const struct net_device_ops *ops = real_dev->netdev_ops; + struct ifreq ifrr; + int err = -EOPNOTSUPP; + + strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); + ifrr.ifr_ifru = ifr->ifr_ifru; + + switch (cmd) { + case SIOCSHWTSTAMP: + if (!net_eq(dev_net(dev), &init_net)) + break; + fallthrough; + case SIOCGHWTSTAMP: + if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) + err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); + break; + } + + if (!err) + ifr->ifr_ifru = ifrr.ifr_ifru; + + return err; +} + +/* + * macvlan network devices have devices nesting below it and are a special + * "super class" of normal network devices; split their locks off into a + * separate class since they always nest. + */ +static struct lock_class_key macvlan_netdev_addr_lock_key; + +#define ALWAYS_ON_OFFLOADS \ + (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ + NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL) + +#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) + +#define MACVLAN_FEATURES \ + (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ + NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \ + NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ + NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) + +#define MACVLAN_STATE_MASK \ + ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) + +static void macvlan_set_lockdep_class(struct net_device *dev) +{ + netdev_lockdep_set_classes(dev); + lockdep_set_class(&dev->addr_list_lock, + &macvlan_netdev_addr_lock_key); +} + +static int macvlan_init(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + struct macvlan_port *port = vlan->port; + + dev->state = (dev->state & ~MACVLAN_STATE_MASK) | + (lowerdev->state & MACVLAN_STATE_MASK); + dev->features = lowerdev->features & MACVLAN_FEATURES; + dev->features |= ALWAYS_ON_FEATURES; + dev->hw_features |= NETIF_F_LRO; + dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; + dev->vlan_features |= ALWAYS_ON_OFFLOADS; + dev->hw_enc_features |= dev->features; + netif_inherit_tso_max(dev, lowerdev); + dev->hard_header_len = lowerdev->hard_header_len; + macvlan_set_lockdep_class(dev); + + vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); + if (!vlan->pcpu_stats) + return -ENOMEM; + + port->count += 1; + + /* Get macvlan's reference to lowerdev */ + netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL); + + return 0; +} + +static void macvlan_uninit(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct macvlan_port *port = vlan->port; + + free_percpu(vlan->pcpu_stats); + + macvlan_flush_sources(port, vlan); + port->count -= 1; + if (!port->count) + macvlan_port_destroy(port->dev); +} + +static void macvlan_dev_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *stats) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + if (vlan->pcpu_stats) { + struct vlan_pcpu_stats *p; + u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; + u32 rx_errors = 0, tx_dropped = 0; + unsigned int start; + int i; + + for_each_possible_cpu(i) { + p = per_cpu_ptr(vlan->pcpu_stats, i); + do { + start = u64_stats_fetch_begin_irq(&p->syncp); + rx_packets = u64_stats_read(&p->rx_packets); + rx_bytes = u64_stats_read(&p->rx_bytes); + rx_multicast = u64_stats_read(&p->rx_multicast); + tx_packets = u64_stats_read(&p->tx_packets); + tx_bytes = u64_stats_read(&p->tx_bytes); + } while (u64_stats_fetch_retry_irq(&p->syncp, start)); + + stats->rx_packets += rx_packets; + stats->rx_bytes += rx_bytes; + stats->multicast += rx_multicast; + stats->tx_packets += tx_packets; + stats->tx_bytes += tx_bytes; + /* rx_errors & tx_dropped are u32, updated + * without syncp protection. + */ + rx_errors += READ_ONCE(p->rx_errors); + tx_dropped += READ_ONCE(p->tx_dropped); + } + stats->rx_errors = rx_errors; + stats->rx_dropped = rx_errors; + stats->tx_dropped = tx_dropped; + } +} + +static int macvlan_vlan_rx_add_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + return vlan_vid_add(lowerdev, proto, vid); +} + +static int macvlan_vlan_rx_kill_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *lowerdev = vlan->lowerdev; + + vlan_vid_del(lowerdev, proto, vid); + return 0; +} + +static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], + struct net_device *dev, + const unsigned char *addr, u16 vid, + u16 flags, + struct netlink_ext_ack *extack) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + int err = -EINVAL; + + /* Support unicast filter only on passthru devices. + * Multicast filter should be allowed on all devices. + */ + if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + return -EOPNOTSUPP; + + if (flags & NLM_F_REPLACE) + return -EOPNOTSUPP; + + if (is_unicast_ether_addr(addr)) + err = dev_uc_add_excl(dev, addr); + else if (is_multicast_ether_addr(addr)) + err = dev_mc_add_excl(dev, addr); + + return err; +} + +static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[], + struct net_device *dev, + const unsigned char *addr, u16 vid, + struct netlink_ext_ack *extack) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + int err = -EINVAL; + + /* Support unicast filter only on passthru devices. + * Multicast filter should be allowed on all devices. + */ + if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + return -EOPNOTSUPP; + + if (is_unicast_ether_addr(addr)) + err = dev_uc_del(dev, addr); + else if (is_multicast_ether_addr(addr)) + err = dev_mc_del(dev, addr); + + return err; +} + +static void macvlan_ethtool_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *drvinfo) +{ + strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); + strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); +} + +static int macvlan_ethtool_get_link_ksettings(struct net_device *dev, + struct ethtool_link_ksettings *cmd) +{ + const struct macvlan_dev *vlan = netdev_priv(dev); + + return __ethtool_get_link_ksettings(vlan->lowerdev, cmd); +} + +static int macvlan_ethtool_get_ts_info(struct net_device *dev, + struct ethtool_ts_info *info) +{ + struct net_device *real_dev = macvlan_dev_real_dev(dev); + const struct ethtool_ops *ops = real_dev->ethtool_ops; + struct phy_device *phydev = real_dev->phydev; + + if (phy_has_tsinfo(phydev)) { + return phy_ts_info(phydev, info); + } else if (ops->get_ts_info) { + return ops->get_ts_info(real_dev, info); + } else { + info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | + SOF_TIMESTAMPING_SOFTWARE; + info->phc_index = -1; + } + + return 0; +} + +static netdev_features_t macvlan_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + netdev_features_t lowerdev_features = vlan->lowerdev->features; + netdev_features_t mask; + + features |= NETIF_F_ALL_FOR_ALL; + features &= (vlan->set_features | ~MACVLAN_FEATURES); + mask = features; + + lowerdev_features &= (features | ~NETIF_F_LRO); + features = netdev_increment_features(lowerdev_features, features, mask); + features |= ALWAYS_ON_FEATURES; + features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES); + + return features; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +static void macvlan_dev_poll_controller(struct net_device *dev) +{ + return; +} + +static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct net_device *real_dev = vlan->lowerdev; + struct netpoll *netpoll; + int err; + + netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); + err = -ENOMEM; + if (!netpoll) + goto out; + + err = __netpoll_setup(netpoll, real_dev); + if (err) { + kfree(netpoll); + goto out; + } + + vlan->netpoll = netpoll; + +out: + return err; +} + +static void macvlan_dev_netpoll_cleanup(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct netpoll *netpoll = vlan->netpoll; + + if (!netpoll) + return; + + vlan->netpoll = NULL; + + __netpoll_free(netpoll); +} +#endif /* CONFIG_NET_POLL_CONTROLLER */ + +static int macvlan_dev_get_iflink(const struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + return vlan->lowerdev->ifindex; +} + +static const struct ethtool_ops macvlan_ethtool_ops = { + .get_link = ethtool_op_get_link, + .get_link_ksettings = macvlan_ethtool_get_link_ksettings, + .get_drvinfo = macvlan_ethtool_get_drvinfo, + .get_ts_info = macvlan_ethtool_get_ts_info, +}; + +static const struct net_device_ops macvlan_netdev_ops = { + .ndo_init = macvlan_init, + .ndo_uninit = macvlan_uninit, + .ndo_open = macvlan_open, + .ndo_stop = macvlan_stop, + .ndo_start_xmit = macvlan_start_xmit, + .ndo_change_mtu = macvlan_change_mtu, + .ndo_eth_ioctl = macvlan_eth_ioctl, + .ndo_fix_features = macvlan_fix_features, + .ndo_change_rx_flags = macvlan_change_rx_flags, + .ndo_set_mac_address = macvlan_set_mac_address, + .ndo_set_rx_mode = macvlan_set_mac_lists, + .ndo_get_stats64 = macvlan_dev_get_stats64, + .ndo_validate_addr = eth_validate_addr, + .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid, + .ndo_fdb_add = macvlan_fdb_add, + .ndo_fdb_del = macvlan_fdb_del, + .ndo_fdb_dump = ndo_dflt_fdb_dump, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = macvlan_dev_poll_controller, + .ndo_netpoll_setup = macvlan_dev_netpoll_setup, + .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup, +#endif + .ndo_get_iflink = macvlan_dev_get_iflink, + .ndo_features_check = passthru_features_check, +}; + +static void macvlan_dev_free(struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + /* Get rid of the macvlan's reference to lowerdev */ + netdev_put(vlan->lowerdev, &vlan->dev_tracker); +} + +void macvlan_common_setup(struct net_device *dev) +{ + ether_setup(dev); + + /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */ + dev->max_mtu = ETH_MAX_MTU; + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + netif_keep_dst(dev); + dev->priv_flags |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN; + dev->netdev_ops = &macvlan_netdev_ops; + dev->needs_free_netdev = true; + dev->priv_destructor = macvlan_dev_free; + dev->header_ops = &macvlan_hard_header_ops; + dev->ethtool_ops = &macvlan_ethtool_ops; +} +EXPORT_SYMBOL_GPL(macvlan_common_setup); + +static void macvlan_setup(struct net_device *dev) +{ + macvlan_common_setup(dev); + dev->priv_flags |= IFF_NO_QUEUE; +} + +static int macvlan_port_create(struct net_device *dev) +{ + struct macvlan_port *port; + unsigned int i; + int err; + + if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) + return -EINVAL; + + if (netdev_is_rx_handler_busy(dev)) + return -EBUSY; + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (port == NULL) + return -ENOMEM; + + port->dev = dev; + ether_addr_copy(port->perm_addr, dev->dev_addr); + INIT_LIST_HEAD(&port->vlans); + for (i = 0; i < MACVLAN_HASH_SIZE; i++) + INIT_HLIST_HEAD(&port->vlan_hash[i]); + for (i = 0; i < MACVLAN_HASH_SIZE; i++) + INIT_HLIST_HEAD(&port->vlan_source_hash[i]); + + port->bc_queue_len_used = 0; + skb_queue_head_init(&port->bc_queue); + INIT_WORK(&port->bc_work, macvlan_process_broadcast); + + err = netdev_rx_handler_register(dev, macvlan_handle_frame, port); + if (err) + kfree(port); + else + dev->priv_flags |= IFF_MACVLAN_PORT; + return err; +} + +static void macvlan_port_destroy(struct net_device *dev) +{ + struct macvlan_port *port = macvlan_port_get_rtnl(dev); + struct sk_buff *skb; + + dev->priv_flags &= ~IFF_MACVLAN_PORT; + netdev_rx_handler_unregister(dev); + + /* After this point, no packet can schedule bc_work anymore, + * but we need to cancel it and purge left skbs if any. + */ + cancel_work_sync(&port->bc_work); + + while ((skb = __skb_dequeue(&port->bc_queue))) { + const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src; + + if (src) + dev_put(src->dev); + + kfree_skb(skb); + } + + /* If the lower device address has been changed by passthru + * macvlan, put it back. + */ + if (macvlan_passthru(port) && + !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { + struct sockaddr sa; + + sa.sa_family = port->dev->type; + memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len); + dev_set_mac_address(port->dev, &sa, NULL); + } + + kfree(port); +} + +static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct nlattr *nla, *head; + int rem, len; + + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) + return -EINVAL; + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) + return -EADDRNOTAVAIL; + } + + if (!data) + return 0; + + if (data[IFLA_MACVLAN_FLAGS] && + nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC | + MACVLAN_FLAG_NODST)) + return -EINVAL; + + if (data[IFLA_MACVLAN_MODE]) { + switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) { + case MACVLAN_MODE_PRIVATE: + case MACVLAN_MODE_VEPA: + case MACVLAN_MODE_BRIDGE: + case MACVLAN_MODE_PASSTHRU: + case MACVLAN_MODE_SOURCE: + break; + default: + return -EINVAL; + } + } + + if (data[IFLA_MACVLAN_MACADDR_MODE]) { + switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) { + case MACVLAN_MACADDR_ADD: + case MACVLAN_MACADDR_DEL: + case MACVLAN_MACADDR_FLUSH: + case MACVLAN_MACADDR_SET: + break; + default: + return -EINVAL; + } + } + + if (data[IFLA_MACVLAN_MACADDR]) { + if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN) + return -EINVAL; + + if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR]))) + return -EADDRNOTAVAIL; + } + + if (data[IFLA_MACVLAN_MACADDR_DATA]) { + head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); + len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); + + nla_for_each_attr(nla, head, len, rem) { + if (nla_type(nla) != IFLA_MACVLAN_MACADDR || + nla_len(nla) != ETH_ALEN) + return -EINVAL; + + if (!is_valid_ether_addr(nla_data(nla))) + return -EADDRNOTAVAIL; + } + } + + if (data[IFLA_MACVLAN_MACADDR_COUNT]) + return -EINVAL; + + return 0; +} + +/* + * reconfigure list of remote source mac address + * (only for macvlan devices in source mode) + * Note regarding alignment: all netlink data is aligned to 4 Byte, which + * suffices for both ether_addr_copy and ether_addr_equal_64bits usage. + */ +static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode, + struct nlattr *data[]) +{ + char *addr = NULL; + int ret, rem, len; + struct nlattr *nla, *head; + struct macvlan_source_entry *entry; + + if (data[IFLA_MACVLAN_MACADDR]) + addr = nla_data(data[IFLA_MACVLAN_MACADDR]); + + if (mode == MACVLAN_MACADDR_ADD) { + if (!addr) + return -EINVAL; + + return macvlan_hash_add_source(vlan, addr); + + } else if (mode == MACVLAN_MACADDR_DEL) { + if (!addr) + return -EINVAL; + + entry = macvlan_hash_lookup_source(vlan, addr); + if (entry) { + macvlan_hash_del_source(entry); + vlan->macaddr_count--; + } + } else if (mode == MACVLAN_MACADDR_FLUSH) { + macvlan_flush_sources(vlan->port, vlan); + } else if (mode == MACVLAN_MACADDR_SET) { + macvlan_flush_sources(vlan->port, vlan); + + if (addr) { + ret = macvlan_hash_add_source(vlan, addr); + if (ret) + return ret; + } + + if (!data[IFLA_MACVLAN_MACADDR_DATA]) + return 0; + + head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]); + len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]); + + nla_for_each_attr(nla, head, len, rem) { + addr = nla_data(nla); + ret = macvlan_hash_add_source(vlan, addr); + if (ret) + return ret; + } + } else { + return -EINVAL; + } + + return 0; +} + +int macvlan_common_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct macvlan_port *port; + struct net_device *lowerdev; + int err; + int macmode; + bool create = false; + + if (!tb[IFLA_LINK]) + return -EINVAL; + + lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); + if (lowerdev == NULL) + return -ENODEV; + + /* When creating macvlans or macvtaps on top of other macvlans - use + * the real device as the lowerdev. + */ + if (netif_is_macvlan(lowerdev)) + lowerdev = macvlan_dev_real_dev(lowerdev); + + if (!tb[IFLA_MTU]) + dev->mtu = lowerdev->mtu; + else if (dev->mtu > lowerdev->mtu) + return -EINVAL; + + /* MTU range: 68 - lowerdev->max_mtu */ + dev->min_mtu = ETH_MIN_MTU; + dev->max_mtu = lowerdev->max_mtu; + + if (!tb[IFLA_ADDRESS]) + eth_hw_addr_random(dev); + + if (!netif_is_macvlan_port(lowerdev)) { + err = macvlan_port_create(lowerdev); + if (err < 0) + return err; + create = true; + } + port = macvlan_port_get_rtnl(lowerdev); + + /* Only 1 macvlan device can be created in passthru mode */ + if (macvlan_passthru(port)) { + /* The macvlan port must be not created this time, + * still goto destroy_macvlan_port for readability. + */ + err = -EINVAL; + goto destroy_macvlan_port; + } + + vlan->lowerdev = lowerdev; + vlan->dev = dev; + vlan->port = port; + vlan->set_features = MACVLAN_FEATURES; + + vlan->mode = MACVLAN_MODE_VEPA; + if (data && data[IFLA_MACVLAN_MODE]) + vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + + if (data && data[IFLA_MACVLAN_FLAGS]) + vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); + + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + if (port->count) { + err = -EINVAL; + goto destroy_macvlan_port; + } + macvlan_set_passthru(port); + eth_hw_addr_inherit(dev, lowerdev); + } + + if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { + if (vlan->mode != MACVLAN_MODE_SOURCE) { + err = -EINVAL; + goto destroy_macvlan_port; + } + macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); + err = macvlan_changelink_sources(vlan, macmode, data); + if (err) + goto destroy_macvlan_port; + } + + vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN; + if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) + vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); + + err = register_netdevice(dev); + if (err < 0) + goto destroy_macvlan_port; + + dev->priv_flags |= IFF_MACVLAN; + err = netdev_upper_dev_link(lowerdev, dev, extack); + if (err) + goto unregister_netdev; + + list_add_tail_rcu(&vlan->list, &port->vlans); + update_port_bc_queue_len(vlan->port); + netif_stacked_transfer_operstate(lowerdev, dev); + linkwatch_fire_event(dev); + + return 0; + +unregister_netdev: + /* macvlan_uninit would free the macvlan port */ + unregister_netdevice(dev); + return err; +destroy_macvlan_port: + /* the macvlan port may be freed by macvlan_uninit when fail to register. + * so we destroy the macvlan port only when it's valid. + */ + if (create && macvlan_port_get_rtnl(lowerdev)) { + macvlan_flush_sources(port, vlan); + macvlan_port_destroy(port->dev); + } + return err; +} +EXPORT_SYMBOL_GPL(macvlan_common_newlink); + +static int macvlan_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + return macvlan_common_newlink(src_net, dev, tb, data, extack); +} + +void macvlan_dellink(struct net_device *dev, struct list_head *head) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + if (vlan->mode == MACVLAN_MODE_SOURCE) + macvlan_flush_sources(vlan->port, vlan); + list_del_rcu(&vlan->list); + update_port_bc_queue_len(vlan->port); + unregister_netdevice_queue(dev, head); + netdev_upper_dev_unlink(vlan->lowerdev, dev); +} +EXPORT_SYMBOL_GPL(macvlan_dellink); + +static int macvlan_changelink(struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + enum macvlan_mode mode; + bool set_mode = false; + enum macvlan_macaddr_mode macmode; + int ret; + + /* Validate mode, but don't set yet: setting flags may fail. */ + if (data && data[IFLA_MACVLAN_MODE]) { + set_mode = true; + mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); + /* Passthrough mode can't be set or cleared dynamically */ + if ((mode == MACVLAN_MODE_PASSTHRU) != + (vlan->mode == MACVLAN_MODE_PASSTHRU)) + return -EINVAL; + if (vlan->mode == MACVLAN_MODE_SOURCE && + vlan->mode != mode) + macvlan_flush_sources(vlan->port, vlan); + } + + if (data && data[IFLA_MACVLAN_FLAGS]) { + __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); + bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; + if (macvlan_passthru(vlan->port) && promisc) { + int err; + + if (flags & MACVLAN_FLAG_NOPROMISC) + err = dev_set_promiscuity(vlan->lowerdev, -1); + else + err = dev_set_promiscuity(vlan->lowerdev, 1); + if (err < 0) + return err; + } + vlan->flags = flags; + } + + if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) { + vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]); + update_port_bc_queue_len(vlan->port); + } + + if (set_mode) + vlan->mode = mode; + if (data && data[IFLA_MACVLAN_MACADDR_MODE]) { + if (vlan->mode != MACVLAN_MODE_SOURCE) + return -EINVAL; + macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]); + ret = macvlan_changelink_sources(vlan, macmode, data); + if (ret) + return ret; + } + return 0; +} + +static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan) +{ + if (vlan->macaddr_count == 0) + return 0; + return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */ + + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN); +} + +static size_t macvlan_get_size(const struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + + return (0 + + nla_total_size(4) /* IFLA_MACVLAN_MODE */ + + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ + + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */ + + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */ + + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */ + + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */ + ); +} + +static int macvlan_fill_info_macaddr(struct sk_buff *skb, + const struct macvlan_dev *vlan, + const int i) +{ + struct hlist_head *h = &vlan->port->vlan_source_hash[i]; + struct macvlan_source_entry *entry; + + hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) { + if (entry->vlan != vlan) + continue; + if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr)) + return 1; + } + return 0; +} + +static int macvlan_fill_info(struct sk_buff *skb, + const struct net_device *dev) +{ + struct macvlan_dev *vlan = netdev_priv(dev); + struct macvlan_port *port = vlan->port; + int i; + struct nlattr *nest; + + if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode)) + goto nla_put_failure; + if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags)) + goto nla_put_failure; + if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count)) + goto nla_put_failure; + if (vlan->macaddr_count > 0) { + nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA); + if (nest == NULL) + goto nla_put_failure; + + for (i = 0; i < MACVLAN_HASH_SIZE; i++) { + if (macvlan_fill_info_macaddr(skb, vlan, i)) + goto nla_put_failure; + } + nla_nest_end(skb, nest); + } + if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req)) + goto nla_put_failure; + if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used)) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = { + [IFLA_MACVLAN_MODE] = { .type = NLA_U32 }, + [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 }, + [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 }, + [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, + [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED }, + [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 }, + [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 }, + [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT }, +}; + +int macvlan_link_register(struct rtnl_link_ops *ops) +{ + /* common fields */ + ops->validate = macvlan_validate; + ops->maxtype = IFLA_MACVLAN_MAX; + ops->policy = macvlan_policy; + ops->changelink = macvlan_changelink; + ops->get_size = macvlan_get_size; + ops->fill_info = macvlan_fill_info; + + return rtnl_link_register(ops); +}; +EXPORT_SYMBOL_GPL(macvlan_link_register); + +static struct net *macvlan_get_link_net(const struct net_device *dev) +{ + return dev_net(macvlan_dev_real_dev(dev)); +} + +static struct rtnl_link_ops macvlan_link_ops = { + .kind = "macvlan", + .setup = macvlan_setup, + .newlink = macvlan_newlink, + .dellink = macvlan_dellink, + .get_link_net = macvlan_get_link_net, + .priv_size = sizeof(struct macvlan_dev), +}; + +static void update_port_bc_queue_len(struct macvlan_port *port) +{ + u32 max_bc_queue_len_req = 0; + struct macvlan_dev *vlan; + + list_for_each_entry(vlan, &port->vlans, list) { + if (vlan->bc_queue_len_req > max_bc_queue_len_req) + max_bc_queue_len_req = vlan->bc_queue_len_req; + } + port->bc_queue_len_used = max_bc_queue_len_req; +} + +static int macvlan_device_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct macvlan_dev *vlan, *next; + struct macvlan_port *port; + LIST_HEAD(list_kill); + + if (!netif_is_macvlan_port(dev)) + return NOTIFY_DONE; + + port = macvlan_port_get_rtnl(dev); + + switch (event) { + case NETDEV_UP: + case NETDEV_DOWN: + case NETDEV_CHANGE: + list_for_each_entry(vlan, &port->vlans, list) + netif_stacked_transfer_operstate(vlan->lowerdev, + vlan->dev); + break; + case NETDEV_FEAT_CHANGE: + list_for_each_entry(vlan, &port->vlans, list) { + netif_inherit_tso_max(vlan->dev, dev); + netdev_update_features(vlan->dev); + } + break; + case NETDEV_CHANGEMTU: + list_for_each_entry(vlan, &port->vlans, list) { + if (vlan->dev->mtu <= dev->mtu) + continue; + dev_set_mtu(vlan->dev, dev->mtu); + } + break; + case NETDEV_CHANGEADDR: + if (!macvlan_passthru(port)) + return NOTIFY_DONE; + + vlan = list_first_entry_or_null(&port->vlans, + struct macvlan_dev, + list); + + if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) + return NOTIFY_BAD; + + break; + case NETDEV_UNREGISTER: + /* twiddle thumbs on netns device moves */ + if (dev->reg_state != NETREG_UNREGISTERING) + break; + + list_for_each_entry_safe(vlan, next, &port->vlans, list) + vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill); + unregister_netdevice_many(&list_kill); + break; + case NETDEV_PRE_TYPE_CHANGE: + /* Forbid underlying device to change its type. */ + return NOTIFY_BAD; + + case NETDEV_NOTIFY_PEERS: + case NETDEV_BONDING_FAILOVER: + case NETDEV_RESEND_IGMP: + /* Propagate to all vlans */ + list_for_each_entry(vlan, &port->vlans, list) + call_netdevice_notifiers(event, vlan->dev); + } + return NOTIFY_DONE; +} + +static struct notifier_block macvlan_notifier_block __read_mostly = { + .notifier_call = macvlan_device_event, +}; + +static int __init macvlan_init_module(void) +{ + int err; + + register_netdevice_notifier(&macvlan_notifier_block); + + err = macvlan_link_register(&macvlan_link_ops); + if (err < 0) + goto err1; + return 0; +err1: + unregister_netdevice_notifier(&macvlan_notifier_block); + return err; +} + +static void __exit macvlan_cleanup_module(void) +{ + rtnl_link_unregister(&macvlan_link_ops); + unregister_netdevice_notifier(&macvlan_notifier_block); +} + +module_init(macvlan_init_module); +module_exit(macvlan_cleanup_module); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); +MODULE_DESCRIPTION("Driver for MAC address based VLANs"); +MODULE_ALIAS_RTNL_LINK("macvlan"); |