| /* |
| * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * 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/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> |
| |
| #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) |
| #define MACVLAN_BC_QUEUE_LEN 1000 |
| |
| struct macvlan_port { |
| struct net_device *dev; |
| struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; |
| struct list_head vlans; |
| struct rcu_head rcu; |
| struct sk_buff_head bc_queue; |
| struct work_struct bc_work; |
| bool passthru; |
| int count; |
| }; |
| |
| 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 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); |
| } |
| |
| #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT) |
| |
| static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, |
| const unsigned char *addr) |
| { |
| struct macvlan_dev *vlan; |
| |
| hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) { |
| if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr)) |
| return vlan; |
| } |
| return NULL; |
| } |
| |
| static void macvlan_hash_add(struct macvlan_dev *vlan) |
| { |
| struct macvlan_port *port = vlan->port; |
| const unsigned char *addr = vlan->dev->dev_addr; |
| |
| hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]); |
| } |
| |
| 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. |
| */ |
| memcpy(vlan->dev->dev_addr, addr, ETH_ALEN); |
| macvlan_hash_add(vlan); |
| } |
| |
| static int macvlan_addr_busy(const struct macvlan_port *port, |
| const unsigned char *addr) |
| { |
| /* Test to see if the specified multicast address is |
| * currently in use by the underlying device or |
| * another macvlan. |
| */ |
| if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) |
| return 1; |
| |
| if (macvlan_hash_lookup(port, addr)) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| 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; |
| |
| for (i = 0; i < MACVLAN_HASH_SIZE; i++) { |
| hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], 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_ni(nskb); |
| macvlan_count_rx(vlan, skb->len + ETH_HLEN, |
| err == NET_RX_SUCCESS, 1); |
| } |
| } |
| } |
| |
| 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); |
| kfree_skb(skb); |
| } |
| } |
| |
| 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) < MACVLAN_BC_QUEUE_LEN) { |
| if (src) |
| dev_hold(src->dev); |
| __skb_queue_tail(&port->bc_queue, nskb); |
| err = 0; |
| } |
| spin_unlock(&port->bc_queue.lock); |
| |
| if (err) |
| goto free_nskb; |
| |
| schedule_work(&port->bc_work); |
| return; |
| |
| free_nskb: |
| kfree_skb(nskb); |
| err: |
| atomic_long_inc(&skb->dev->rx_dropped); |
| } |
| |
| /* 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 = NET_RX_DROP; |
| |
| port = macvlan_port_get_rcu(skb->dev); |
| if (is_multicast_ether_addr(eth->h_dest)) { |
| skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN); |
| if (!skb) |
| return RX_HANDLER_CONSUMED; |
| *pskb = skb; |
| eth = eth_hdr(skb); |
| 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); |
| goto out; |
| } |
| |
| macvlan_broadcast_enqueue(port, src, skb); |
| |
| return RX_HANDLER_PASS; |
| } |
| |
| if (port->passthru) |
| vlan = list_first_or_null_rcu(&port->vlans, |
| struct macvlan_dev, list); |
| else |
| vlan = macvlan_hash_lookup(port, eth->h_dest); |
| if (vlan == NULL) |
| 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) |
| goto out; |
| |
| *pskb = skb; |
| skb->dev = dev; |
| skb->pkt_type = PACKET_HOST; |
| |
| ret = netif_rx(skb); |
| |
| out: |
| macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0); |
| return RX_HANDLER_CONSUMED; |
| } |
| |
| 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 = (void *)skb->data; |
| |
| /* send to other bridge ports directly */ |
| if (is_multicast_ether_addr(eth->h_dest)) { |
| 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(skb); |
| } |
| |
| static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb) |
| { |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| if (vlan->netpoll) |
| netpoll_send_skb(vlan->netpoll, skb); |
| #else |
| BUG(); |
| #endif |
| return NETDEV_TX_OK; |
| } |
| |
| static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb, |
| struct net_device *dev) |
| { |
| unsigned int len = skb->len; |
| int ret; |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| if (unlikely(netpoll_tx_running(dev))) |
| return macvlan_netpoll_send_skb(vlan, skb); |
| |
| if (vlan->fwd_priv) { |
| skb->dev = vlan->lowerdev; |
| ret = dev_queue_xmit_accel(skb, vlan->fwd_priv); |
| } else { |
| 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); |
| pcpu_stats->tx_packets++; |
| 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, |
| .rebuild = eth_rebuild_header, |
| .parse = eth_header_parse, |
| .cache = eth_header_cache, |
| .cache_update = eth_header_cache_update, |
| }; |
| |
| static struct rtnl_link_ops macvlan_link_ops; |
| |
| static int macvlan_open(struct net_device *dev) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| struct net_device *lowerdev = vlan->lowerdev; |
| int err; |
| |
| if (vlan->port->passthru) { |
| if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { |
| err = dev_set_promiscuity(lowerdev, 1); |
| if (err < 0) |
| goto out; |
| } |
| goto hash_add; |
| } |
| |
| if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD && |
| dev->rtnl_link_ops == &macvlan_link_ops) { |
| vlan->fwd_priv = |
| lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev); |
| |
| /* If we get a NULL pointer back, or if we get an error |
| * then we should just fall through to the non accelerated path |
| */ |
| if (IS_ERR_OR_NULL(vlan->fwd_priv)) { |
| vlan->fwd_priv = NULL; |
| } else |
| return 0; |
| } |
| |
| err = -EBUSY; |
| if (macvlan_addr_busy(vlan->port, dev->dev_addr)) |
| goto out; |
| |
| 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; |
| } |
| |
| hash_add: |
| macvlan_hash_add(vlan); |
| return 0; |
| |
| del_unicast: |
| dev_uc_del(lowerdev, dev->dev_addr); |
| out: |
| if (vlan->fwd_priv) { |
| lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, |
| vlan->fwd_priv); |
| vlan->fwd_priv = NULL; |
| } |
| 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->fwd_priv) { |
| lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev, |
| vlan->fwd_priv); |
| vlan->fwd_priv = NULL; |
| return 0; |
| } |
| |
| dev_uc_unsync(lowerdev, dev); |
| dev_mc_unsync(lowerdev, dev); |
| |
| if (vlan->port->passthru) { |
| if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) |
| dev_set_promiscuity(lowerdev, -1); |
| goto hash_del; |
| } |
| |
| if (dev->flags & IFF_ALLMULTI) |
| dev_set_allmulti(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, unsigned char *addr) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| struct net_device *lowerdev = vlan->lowerdev; |
| int err; |
| |
| if (!(dev->flags & IFF_UP)) { |
| /* Just copy in the new address */ |
| ether_addr_copy(dev->dev_addr, addr); |
| } else { |
| /* Rehash and update the device filters */ |
| if (macvlan_addr_busy(vlan->port, addr)) |
| return -EBUSY; |
| |
| if (!vlan->port->passthru) { |
| err = dev_uc_add(lowerdev, addr); |
| if (err) |
| return err; |
| |
| dev_uc_del(lowerdev, dev->dev_addr); |
| } |
| |
| macvlan_hash_change_addr(vlan, addr); |
| } |
| 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 (vlan->mode == MACVLAN_MODE_PASSTHRU) { |
| dev_set_mac_address(vlan->lowerdev, addr); |
| return 0; |
| } |
| |
| 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); |
| } |
| } |
| |
| static void macvlan_set_mac_lists(struct net_device *dev) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { |
| bitmap_fill(vlan->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(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); |
| } |
| dev_uc_sync(vlan->lowerdev, dev); |
| dev_mc_sync(vlan->lowerdev, dev); |
| } |
| |
| static int macvlan_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) |
| return -EINVAL; |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| /* |
| * 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_xmit_lock_key; |
| static struct lock_class_key macvlan_netdev_addr_lock_key; |
| |
| #define ALWAYS_ON_FEATURES \ |
| (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX) |
| |
| #define MACVLAN_FEATURES \ |
| (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ |
| NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ |
| NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ |
| NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) |
| |
| #define MACVLAN_STATE_MASK \ |
| ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) |
| |
| static int macvlan_get_nest_level(struct net_device *dev) |
| { |
| return ((struct macvlan_dev *)netdev_priv(dev))->nest_level; |
| } |
| |
| static void macvlan_set_lockdep_class_one(struct net_device *dev, |
| struct netdev_queue *txq, |
| void *_unused) |
| { |
| lockdep_set_class(&txq->_xmit_lock, |
| &macvlan_netdev_xmit_lock_key); |
| } |
| |
| static void macvlan_set_lockdep_class(struct net_device *dev) |
| { |
| lockdep_set_class_and_subclass(&dev->addr_list_lock, |
| &macvlan_netdev_addr_lock_key, |
| macvlan_get_nest_level(dev)); |
| netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL); |
| } |
| |
| static int macvlan_init(struct net_device *dev) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| const struct net_device *lowerdev = vlan->lowerdev; |
| |
| dev->state = (dev->state & ~MACVLAN_STATE_MASK) | |
| (lowerdev->state & MACVLAN_STATE_MASK); |
| dev->features = lowerdev->features & MACVLAN_FEATURES; |
| dev->features |= ALWAYS_ON_FEATURES; |
| dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; |
| dev->gso_max_size = lowerdev->gso_max_size; |
| dev->iflink = lowerdev->ifindex; |
| 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; |
| |
| 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); |
| |
| port->count -= 1; |
| if (!port->count) |
| macvlan_port_destroy(port->dev); |
| } |
| |
| static struct rtnl_link_stats64 *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 = p->rx_packets; |
| rx_bytes = p->rx_bytes; |
| rx_multicast = p->rx_multicast; |
| tx_packets = p->tx_packets; |
| tx_bytes = 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 += p->rx_errors; |
| tx_dropped += p->tx_dropped; |
| } |
| stats->rx_errors = rx_errors; |
| stats->rx_dropped = rx_errors; |
| stats->tx_dropped = tx_dropped; |
| } |
| return stats; |
| } |
| |
| 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 flags) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| int err = -EINVAL; |
| |
| if (!vlan->port->passthru) |
| 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) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| int err = -EINVAL; |
| |
| if (!vlan->port->passthru) |
| 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) |
| { |
| strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver)); |
| strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version)); |
| } |
| |
| static int macvlan_ethtool_get_settings(struct net_device *dev, |
| struct ethtool_cmd *cmd) |
| { |
| const struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| return __ethtool_get_settings(vlan->lowerdev, cmd); |
| } |
| |
| 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 mask; |
| |
| features |= NETIF_F_ALL_FOR_ALL; |
| features &= (vlan->set_features | ~MACVLAN_FEATURES); |
| mask = features; |
| |
| features = netdev_increment_features(vlan->lowerdev->features, |
| features, |
| mask); |
| features |= ALWAYS_ON_FEATURES; |
| features &= ~NETIF_F_NETNS_LOCAL; |
| |
| 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 = 0; |
| |
| 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_async(netpoll); |
| } |
| #endif /* CONFIG_NET_POLL_CONTROLLER */ |
| |
| static const struct ethtool_ops macvlan_ethtool_ops = { |
| .get_link = ethtool_op_get_link, |
| .get_settings = macvlan_ethtool_get_settings, |
| .get_drvinfo = macvlan_ethtool_get_drvinfo, |
| }; |
| |
| 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_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, |
| .ndo_get_lock_subclass = macvlan_get_nest_level, |
| #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 |
| }; |
| |
| void macvlan_common_setup(struct net_device *dev) |
| { |
| ether_setup(dev); |
| |
| dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); |
| dev->priv_flags |= IFF_UNICAST_FLT; |
| dev->netdev_ops = &macvlan_netdev_ops; |
| dev->destructor = free_netdev; |
| 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->tx_queue_len = 0; |
| } |
| |
| 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; |
| |
| port = kzalloc(sizeof(*port), GFP_KERNEL); |
| if (port == NULL) |
| return -ENOMEM; |
| |
| port->passthru = false; |
| port->dev = dev; |
| INIT_LIST_HEAD(&port->vlans); |
| for (i = 0; i < MACVLAN_HASH_SIZE; i++) |
| INIT_HLIST_HEAD(&port->vlan_hash[i]); |
| |
| 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); |
| } |
| |
| kfree_rcu(port, rcu); |
| } |
| |
| static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| 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 && data[IFLA_MACVLAN_FLAGS] && |
| nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC) |
| return -EINVAL; |
| |
| if (data && 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: |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| int macvlan_common_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[]) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| struct macvlan_port *port; |
| struct net_device *lowerdev; |
| int err; |
| |
| 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; |
| |
| if (!tb[IFLA_ADDRESS]) |
| eth_hw_addr_random(dev); |
| |
| if (!macvlan_port_exists(lowerdev)) { |
| err = macvlan_port_create(lowerdev); |
| if (err < 0) |
| return err; |
| } |
| port = macvlan_port_get_rtnl(lowerdev); |
| |
| /* Only 1 macvlan device can be created in passthru mode */ |
| if (port->passthru) |
| return -EINVAL; |
| |
| vlan->lowerdev = lowerdev; |
| vlan->dev = dev; |
| vlan->port = port; |
| vlan->set_features = MACVLAN_FEATURES; |
| vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1; |
| |
| 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) |
| return -EINVAL; |
| port->passthru = true; |
| eth_hw_addr_inherit(dev, lowerdev); |
| } |
| |
| port->count += 1; |
| err = register_netdevice(dev); |
| if (err < 0) |
| goto destroy_port; |
| |
| dev->priv_flags |= IFF_MACVLAN; |
| err = netdev_upper_dev_link(lowerdev, dev); |
| if (err) |
| goto unregister_netdev; |
| |
| list_add_tail_rcu(&vlan->list, &port->vlans); |
| netif_stacked_transfer_operstate(lowerdev, dev); |
| |
| return 0; |
| |
| unregister_netdev: |
| unregister_netdevice(dev); |
| destroy_port: |
| port->count -= 1; |
| if (!port->count) |
| macvlan_port_destroy(lowerdev); |
| |
| 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[]) |
| { |
| return macvlan_common_newlink(src_net, dev, tb, data); |
| } |
| |
| void macvlan_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| list_del_rcu(&vlan->list); |
| 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 macvlan_dev *vlan = netdev_priv(dev); |
| enum macvlan_mode mode; |
| bool set_mode = false; |
| |
| /* 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 (data && data[IFLA_MACVLAN_FLAGS]) { |
| __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); |
| bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; |
| if (vlan->port->passthru && 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 (set_mode) |
| vlan->mode = mode; |
| return 0; |
| } |
| |
| static size_t macvlan_get_size(const struct net_device *dev) |
| { |
| return (0 |
| + nla_total_size(4) /* IFLA_MACVLAN_MODE */ |
| + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */ |
| ); |
| } |
| |
| static int macvlan_fill_info(struct sk_buff *skb, |
| const struct net_device *dev) |
| { |
| struct macvlan_dev *vlan = netdev_priv(dev); |
| |
| 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; |
| 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 }, |
| }; |
| |
| int macvlan_link_register(struct rtnl_link_ops *ops) |
| { |
| /* common fields */ |
| ops->priv_size = sizeof(struct macvlan_dev); |
| 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 rtnl_link_ops macvlan_link_ops = { |
| .kind = "macvlan", |
| .setup = macvlan_setup, |
| .newlink = macvlan_newlink, |
| .dellink = macvlan_dellink, |
| }; |
| |
| 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 (!macvlan_port_exists(dev)) |
| return NOTIFY_DONE; |
| |
| port = macvlan_port_get_rtnl(dev); |
| |
| switch (event) { |
| 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) { |
| vlan->dev->gso_max_size = dev->gso_max_size; |
| 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 (!port->passthru) |
| return NOTIFY_DONE; |
| |
| vlan = list_first_entry_or_null(&port->vlans, |
| struct macvlan_dev, |
| list); |
| |
| if (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 underlaying 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"); |