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1126 lines
31 KiB
1126 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (C) B.A.T.M.A.N. contributors: |
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* |
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* Marek Lindner, Simon Wunderlich |
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*/ |
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|
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#include "soft-interface.h" |
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#include "main.h" |
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|
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#include <linux/atomic.h> |
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#include <linux/byteorder/generic.h> |
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#include <linux/cache.h> |
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#include <linux/compiler.h> |
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#include <linux/cpumask.h> |
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#include <linux/errno.h> |
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#include <linux/etherdevice.h> |
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#include <linux/ethtool.h> |
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#include <linux/gfp.h> |
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#include <linux/if_ether.h> |
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#include <linux/if_vlan.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/lockdep.h> |
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#include <linux/netdevice.h> |
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#include <linux/netlink.h> |
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#include <linux/percpu.h> |
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#include <linux/random.h> |
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#include <linux/rculist.h> |
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#include <linux/rcupdate.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/socket.h> |
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#include <linux/spinlock.h> |
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#include <linux/stddef.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <net/net_namespace.h> |
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#include <net/netlink.h> |
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#include <uapi/linux/batadv_packet.h> |
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#include <uapi/linux/batman_adv.h> |
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|
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#include "bat_algo.h" |
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#include "bridge_loop_avoidance.h" |
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#include "distributed-arp-table.h" |
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#include "gateway_client.h" |
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#include "hard-interface.h" |
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#include "multicast.h" |
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#include "network-coding.h" |
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#include "originator.h" |
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#include "send.h" |
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#include "translation-table.h" |
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|
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/** |
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* batadv_skb_head_push() - Increase header size and move (push) head pointer |
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* @skb: packet buffer which should be modified |
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* @len: number of bytes to add |
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* |
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* Return: 0 on success or negative error number in case of failure |
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*/ |
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int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) |
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{ |
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int result; |
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|
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/* TODO: We must check if we can release all references to non-payload |
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* data using __skb_header_release in our skbs to allow skb_cow_header |
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* to work optimally. This means that those skbs are not allowed to read |
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* or write any data which is before the current position of skb->data |
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* after that call and thus allow other skbs with the same data buffer |
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* to write freely in that area. |
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*/ |
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result = skb_cow_head(skb, len); |
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if (result < 0) |
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return result; |
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|
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skb_push(skb, len); |
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return 0; |
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} |
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|
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static int batadv_interface_open(struct net_device *dev) |
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{ |
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netif_start_queue(dev); |
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return 0; |
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} |
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|
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static int batadv_interface_release(struct net_device *dev) |
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{ |
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netif_stop_queue(dev); |
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return 0; |
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} |
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|
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/** |
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* batadv_sum_counter() - Sum the cpu-local counters for index 'idx' |
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* @bat_priv: the bat priv with all the soft interface information |
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* @idx: index of counter to sum up |
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* |
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* Return: sum of all cpu-local counters |
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*/ |
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static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) |
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{ |
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u64 *counters, sum = 0; |
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int cpu; |
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|
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for_each_possible_cpu(cpu) { |
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counters = per_cpu_ptr(bat_priv->bat_counters, cpu); |
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sum += counters[idx]; |
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} |
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|
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return sum; |
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} |
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|
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static struct net_device_stats *batadv_interface_stats(struct net_device *dev) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(dev); |
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struct net_device_stats *stats = &dev->stats; |
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|
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stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); |
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stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); |
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stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); |
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stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); |
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stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); |
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return stats; |
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} |
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|
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static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(dev); |
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struct batadv_softif_vlan *vlan; |
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struct sockaddr *addr = p; |
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u8 old_addr[ETH_ALEN]; |
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|
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if (!is_valid_ether_addr(addr->sa_data)) |
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return -EADDRNOTAVAIL; |
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|
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ether_addr_copy(old_addr, dev->dev_addr); |
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ether_addr_copy(dev->dev_addr, addr->sa_data); |
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|
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/* only modify transtable if it has been initialized before */ |
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if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
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return 0; |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { |
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batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, |
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"mac address changed", false); |
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batadv_tt_local_add(dev, addr->sa_data, vlan->vid, |
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BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
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} |
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rcu_read_unlock(); |
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|
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return 0; |
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} |
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static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) |
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{ |
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/* check ranges */ |
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if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev)) |
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return -EINVAL; |
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dev->mtu = new_mtu; |
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|
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return 0; |
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} |
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/** |
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* batadv_interface_set_rx_mode() - set the rx mode of a device |
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* @dev: registered network device to modify |
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* |
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* We do not actually need to set any rx filters for the virtual batman |
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* soft interface. However a dummy handler enables a user to set static |
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* multicast listeners for instance. |
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*/ |
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static void batadv_interface_set_rx_mode(struct net_device *dev) |
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{ |
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} |
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|
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static netdev_tx_t batadv_interface_tx(struct sk_buff *skb, |
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struct net_device *soft_iface) |
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{ |
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struct ethhdr *ethhdr; |
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struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
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struct batadv_hard_iface *primary_if = NULL; |
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struct batadv_bcast_packet *bcast_packet; |
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static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, |
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0x00, 0x00}; |
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static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, |
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0x00, 0x00}; |
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enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; |
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u8 *dst_hint = NULL, chaddr[ETH_ALEN]; |
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struct vlan_ethhdr *vhdr; |
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unsigned int header_len = 0; |
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int data_len = skb->len, ret; |
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unsigned long brd_delay = 0; |
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bool do_bcast = false, client_added; |
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unsigned short vid; |
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u32 seqno; |
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int gw_mode; |
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enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE; |
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struct batadv_orig_node *mcast_single_orig = NULL; |
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int network_offset = ETH_HLEN; |
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__be16 proto; |
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|
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if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
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goto dropped; |
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|
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/* reset control block to avoid left overs from previous users */ |
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memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); |
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netif_trans_update(soft_iface); |
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vid = batadv_get_vid(skb, 0); |
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|
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skb_reset_mac_header(skb); |
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ethhdr = eth_hdr(skb); |
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proto = ethhdr->h_proto; |
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|
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switch (ntohs(proto)) { |
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case ETH_P_8021Q: |
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if (!pskb_may_pull(skb, sizeof(*vhdr))) |
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goto dropped; |
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vhdr = vlan_eth_hdr(skb); |
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proto = vhdr->h_vlan_encapsulated_proto; |
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|
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/* drop batman-in-batman packets to prevent loops */ |
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if (proto != htons(ETH_P_BATMAN)) { |
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network_offset += VLAN_HLEN; |
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break; |
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} |
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|
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fallthrough; |
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case ETH_P_BATMAN: |
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goto dropped; |
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} |
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skb_set_network_header(skb, network_offset); |
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|
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if (batadv_bla_tx(bat_priv, skb, vid)) |
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goto dropped; |
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|
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/* skb->data might have been reallocated by batadv_bla_tx() */ |
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ethhdr = eth_hdr(skb); |
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|
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/* Register the client MAC in the transtable */ |
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if (!is_multicast_ether_addr(ethhdr->h_source) && |
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!batadv_bla_is_loopdetect_mac(ethhdr->h_source)) { |
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client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, |
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vid, skb->skb_iif, |
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skb->mark); |
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if (!client_added) |
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goto dropped; |
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} |
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|
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/* Snoop address candidates from DHCPACKs for early DAT filling */ |
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batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid); |
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|
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/* don't accept stp packets. STP does not help in meshes. |
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* better use the bridge loop avoidance ... |
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* |
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* The same goes for ECTP sent at least by some Cisco Switches, |
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* it might confuse the mesh when used with bridge loop avoidance. |
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*/ |
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if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) |
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goto dropped; |
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|
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if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) |
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goto dropped; |
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gw_mode = atomic_read(&bat_priv->gw.mode); |
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if (is_multicast_ether_addr(ethhdr->h_dest)) { |
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/* if gw mode is off, broadcast every packet */ |
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if (gw_mode == BATADV_GW_MODE_OFF) { |
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do_bcast = true; |
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goto send; |
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} |
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dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, |
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chaddr); |
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/* skb->data may have been modified by |
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* batadv_gw_dhcp_recipient_get() |
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*/ |
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ethhdr = eth_hdr(skb); |
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/* if gw_mode is on, broadcast any non-DHCP message. |
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* All the DHCP packets are going to be sent as unicast |
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*/ |
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if (dhcp_rcp == BATADV_DHCP_NO) { |
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do_bcast = true; |
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goto send; |
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} |
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|
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if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) |
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dst_hint = chaddr; |
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else if ((gw_mode == BATADV_GW_MODE_SERVER) && |
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(dhcp_rcp == BATADV_DHCP_TO_SERVER)) |
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/* gateways should not forward any DHCP message if |
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* directed to a DHCP server |
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*/ |
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goto dropped; |
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send: |
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if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { |
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forw_mode = batadv_mcast_forw_mode(bat_priv, skb, |
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&mcast_single_orig); |
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if (forw_mode == BATADV_FORW_NONE) |
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goto dropped; |
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if (forw_mode == BATADV_FORW_SINGLE || |
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forw_mode == BATADV_FORW_SOME) |
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do_bcast = false; |
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} |
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} |
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batadv_skb_set_priority(skb, 0); |
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|
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/* ethernet packet should be broadcasted */ |
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if (do_bcast) { |
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primary_if = batadv_primary_if_get_selected(bat_priv); |
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if (!primary_if) |
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goto dropped; |
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|
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/* in case of ARP request, we do not immediately broadcasti the |
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* packet, instead we first wait for DAT to try to retrieve the |
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* correct ARP entry |
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*/ |
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if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) |
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brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); |
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|
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if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) |
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goto dropped; |
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bcast_packet = (struct batadv_bcast_packet *)skb->data; |
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bcast_packet->version = BATADV_COMPAT_VERSION; |
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bcast_packet->ttl = BATADV_TTL - 1; |
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|
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/* batman packet type: broadcast */ |
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bcast_packet->packet_type = BATADV_BCAST; |
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bcast_packet->reserved = 0; |
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|
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/* hw address of first interface is the orig mac because only |
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* this mac is known throughout the mesh |
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*/ |
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ether_addr_copy(bcast_packet->orig, |
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primary_if->net_dev->dev_addr); |
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|
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/* set broadcast sequence number */ |
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seqno = atomic_inc_return(&bat_priv->bcast_seqno); |
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bcast_packet->seqno = htonl(seqno); |
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|
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batadv_send_bcast_packet(bat_priv, skb, brd_delay, true); |
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/* unicast packet */ |
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} else { |
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/* DHCP packets going to a server will use the GW feature */ |
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if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { |
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ret = batadv_gw_out_of_range(bat_priv, skb); |
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if (ret) |
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goto dropped; |
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ret = batadv_send_skb_via_gw(bat_priv, skb, vid); |
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} else if (mcast_single_orig) { |
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ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid, |
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mcast_single_orig); |
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} else if (forw_mode == BATADV_FORW_SOME) { |
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ret = batadv_mcast_forw_send(bat_priv, skb, vid); |
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} else { |
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if (batadv_dat_snoop_outgoing_arp_request(bat_priv, |
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skb)) |
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goto dropped; |
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|
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batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); |
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|
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ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, |
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vid); |
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} |
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if (ret != NET_XMIT_SUCCESS) |
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goto dropped_freed; |
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} |
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|
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batadv_inc_counter(bat_priv, BATADV_CNT_TX); |
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batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); |
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goto end; |
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|
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dropped: |
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kfree_skb(skb); |
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dropped_freed: |
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batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); |
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end: |
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batadv_orig_node_put(mcast_single_orig); |
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batadv_hardif_put(primary_if); |
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return NETDEV_TX_OK; |
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} |
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|
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/** |
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* batadv_interface_rx() - receive ethernet frame on local batman-adv interface |
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* @soft_iface: local interface which will receive the ethernet frame |
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* @skb: ethernet frame for @soft_iface |
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* @hdr_size: size of already parsed batman-adv header |
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* @orig_node: originator from which the batman-adv packet was sent |
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* |
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* Sends an ethernet frame to the receive path of the local @soft_iface. |
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* skb->data has still point to the batman-adv header with the size @hdr_size. |
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* The caller has to have parsed this header already and made sure that at least |
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* @hdr_size bytes are still available for pull in @skb. |
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* |
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* The packet may still get dropped. This can happen when the encapsulated |
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* ethernet frame is invalid or contains again an batman-adv packet. Also |
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* unicast packets will be dropped directly when it was sent between two |
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* isolated clients. |
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*/ |
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void batadv_interface_rx(struct net_device *soft_iface, |
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struct sk_buff *skb, int hdr_size, |
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struct batadv_orig_node *orig_node) |
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{ |
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struct batadv_bcast_packet *batadv_bcast_packet; |
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struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
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struct vlan_ethhdr *vhdr; |
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struct ethhdr *ethhdr; |
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unsigned short vid; |
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int packet_type; |
|
|
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batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; |
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packet_type = batadv_bcast_packet->packet_type; |
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|
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skb_pull_rcsum(skb, hdr_size); |
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skb_reset_mac_header(skb); |
|
|
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/* clean the netfilter state now that the batman-adv header has been |
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* removed |
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*/ |
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nf_reset_ct(skb); |
|
|
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if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
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goto dropped; |
|
|
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vid = batadv_get_vid(skb, 0); |
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ethhdr = eth_hdr(skb); |
|
|
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switch (ntohs(ethhdr->h_proto)) { |
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case ETH_P_8021Q: |
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if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) |
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goto dropped; |
|
|
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vhdr = (struct vlan_ethhdr *)skb->data; |
|
|
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/* drop batman-in-batman packets to prevent loops */ |
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if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) |
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break; |
|
|
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fallthrough; |
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case ETH_P_BATMAN: |
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goto dropped; |
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} |
|
|
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/* skb->dev & skb->pkt_type are set here */ |
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skb->protocol = eth_type_trans(skb, soft_iface); |
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skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
|
|
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batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
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batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
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skb->len + ETH_HLEN); |
|
|
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/* Let the bridge loop avoidance check the packet. If will |
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* not handle it, we can safely push it up. |
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*/ |
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if (batadv_bla_rx(bat_priv, skb, vid, packet_type)) |
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goto out; |
|
|
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if (orig_node) |
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batadv_tt_add_temporary_global_entry(bat_priv, orig_node, |
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ethhdr->h_source, vid); |
|
|
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if (is_multicast_ether_addr(ethhdr->h_dest)) { |
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/* set the mark on broadcast packets if AP isolation is ON and |
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* the packet is coming from an "isolated" client |
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*/ |
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if (batadv_vlan_ap_isola_get(bat_priv, vid) && |
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batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, |
|
vid)) { |
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/* save bits in skb->mark not covered by the mask and |
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* apply the mark on the rest |
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*/ |
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skb->mark &= ~bat_priv->isolation_mark_mask; |
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skb->mark |= bat_priv->isolation_mark; |
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} |
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} else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, |
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ethhdr->h_dest, vid)) { |
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goto dropped; |
|
} |
|
|
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netif_rx(skb); |
|
goto out; |
|
|
|
dropped: |
|
kfree_skb(skb); |
|
out: |
|
return; |
|
} |
|
|
|
/** |
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* batadv_softif_vlan_release() - release vlan from lists and queue for free |
|
* after rcu grace period |
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* @ref: kref pointer of the vlan object |
|
*/ |
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void batadv_softif_vlan_release(struct kref *ref) |
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{ |
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struct batadv_softif_vlan *vlan; |
|
|
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vlan = container_of(ref, struct batadv_softif_vlan, refcount); |
|
|
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spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); |
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hlist_del_rcu(&vlan->list); |
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spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); |
|
|
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kfree_rcu(vlan, rcu); |
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} |
|
|
|
/** |
|
* batadv_softif_vlan_get() - get the vlan object for a specific vid |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @vid: the identifier of the vlan object to retrieve |
|
* |
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* Return: the private data of the vlan matching the vid passed as argument or |
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* NULL otherwise. The refcounter of the returned object is incremented by 1. |
|
*/ |
|
struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, |
|
unsigned short vid) |
|
{ |
|
struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; |
|
|
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rcu_read_lock(); |
|
hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { |
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if (vlan_tmp->vid != vid) |
|
continue; |
|
|
|
if (!kref_get_unless_zero(&vlan_tmp->refcount)) |
|
continue; |
|
|
|
vlan = vlan_tmp; |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
|
|
return vlan; |
|
} |
|
|
|
/** |
|
* batadv_softif_create_vlan() - allocate the needed resources for a new vlan |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @vid: the VLAN identifier |
|
* |
|
* Return: 0 on success, a negative error otherwise. |
|
*/ |
|
int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) |
|
{ |
|
struct batadv_softif_vlan *vlan; |
|
|
|
spin_lock_bh(&bat_priv->softif_vlan_list_lock); |
|
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid); |
|
if (vlan) { |
|
batadv_softif_vlan_put(vlan); |
|
spin_unlock_bh(&bat_priv->softif_vlan_list_lock); |
|
return -EEXIST; |
|
} |
|
|
|
vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); |
|
if (!vlan) { |
|
spin_unlock_bh(&bat_priv->softif_vlan_list_lock); |
|
return -ENOMEM; |
|
} |
|
|
|
vlan->bat_priv = bat_priv; |
|
vlan->vid = vid; |
|
kref_init(&vlan->refcount); |
|
|
|
atomic_set(&vlan->ap_isolation, 0); |
|
|
|
kref_get(&vlan->refcount); |
|
hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); |
|
spin_unlock_bh(&bat_priv->softif_vlan_list_lock); |
|
|
|
/* add a new TT local entry. This one will be marked with the NOPURGE |
|
* flag |
|
*/ |
|
batadv_tt_local_add(bat_priv->soft_iface, |
|
bat_priv->soft_iface->dev_addr, vid, |
|
BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
|
|
|
/* don't return reference to new softif_vlan */ |
|
batadv_softif_vlan_put(vlan); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object |
|
* @bat_priv: the bat priv with all the soft interface information |
|
* @vlan: the object to remove |
|
*/ |
|
static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, |
|
struct batadv_softif_vlan *vlan) |
|
{ |
|
/* explicitly remove the associated TT local entry because it is marked |
|
* with the NOPURGE flag |
|
*/ |
|
batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, |
|
vlan->vid, "vlan interface destroyed", false); |
|
|
|
batadv_softif_vlan_put(vlan); |
|
} |
|
|
|
/** |
|
* batadv_interface_add_vid() - ndo_add_vid API implementation |
|
* @dev: the netdev of the mesh interface |
|
* @proto: protocol of the vlan id |
|
* @vid: identifier of the new vlan |
|
* |
|
* Set up all the internal structures for handling the new vlan on top of the |
|
* mesh interface |
|
* |
|
* Return: 0 on success or a negative error code in case of failure. |
|
*/ |
|
static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, |
|
unsigned short vid) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(dev); |
|
struct batadv_softif_vlan *vlan; |
|
|
|
/* only 802.1Q vlans are supported. |
|
* batman-adv does not know how to handle other types |
|
*/ |
|
if (proto != htons(ETH_P_8021Q)) |
|
return -EINVAL; |
|
|
|
vid |= BATADV_VLAN_HAS_TAG; |
|
|
|
/* if a new vlan is getting created and it already exists, it means that |
|
* it was not deleted yet. batadv_softif_vlan_get() increases the |
|
* refcount in order to revive the object. |
|
* |
|
* if it does not exist then create it. |
|
*/ |
|
vlan = batadv_softif_vlan_get(bat_priv, vid); |
|
if (!vlan) |
|
return batadv_softif_create_vlan(bat_priv, vid); |
|
|
|
/* add a new TT local entry. This one will be marked with the NOPURGE |
|
* flag. This must be added again, even if the vlan object already |
|
* exists, because the entry was deleted by kill_vid() |
|
*/ |
|
batadv_tt_local_add(bat_priv->soft_iface, |
|
bat_priv->soft_iface->dev_addr, vid, |
|
BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* batadv_interface_kill_vid() - ndo_kill_vid API implementation |
|
* @dev: the netdev of the mesh interface |
|
* @proto: protocol of the vlan id |
|
* @vid: identifier of the deleted vlan |
|
* |
|
* Destroy all the internal structures used to handle the vlan identified by vid |
|
* on top of the mesh interface |
|
* |
|
* Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q |
|
* or -ENOENT if the specified vlan id wasn't registered. |
|
*/ |
|
static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, |
|
unsigned short vid) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(dev); |
|
struct batadv_softif_vlan *vlan; |
|
|
|
/* only 802.1Q vlans are supported. batman-adv does not know how to |
|
* handle other types |
|
*/ |
|
if (proto != htons(ETH_P_8021Q)) |
|
return -EINVAL; |
|
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); |
|
if (!vlan) |
|
return -ENOENT; |
|
|
|
batadv_softif_destroy_vlan(bat_priv, vlan); |
|
|
|
/* finally free the vlan object */ |
|
batadv_softif_vlan_put(vlan); |
|
|
|
return 0; |
|
} |
|
|
|
/* batman-adv 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 batadv_netdev_xmit_lock_key; |
|
static struct lock_class_key batadv_netdev_addr_lock_key; |
|
|
|
/** |
|
* batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue |
|
* @dev: device which owns the tx queue |
|
* @txq: tx queue to modify |
|
* @_unused: always NULL |
|
*/ |
|
static void batadv_set_lockdep_class_one(struct net_device *dev, |
|
struct netdev_queue *txq, |
|
void *_unused) |
|
{ |
|
lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); |
|
} |
|
|
|
/** |
|
* batadv_set_lockdep_class() - Set txq and addr_list lockdep class |
|
* @dev: network device to modify |
|
*/ |
|
static void batadv_set_lockdep_class(struct net_device *dev) |
|
{ |
|
lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); |
|
netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); |
|
} |
|
|
|
/** |
|
* batadv_softif_init_late() - late stage initialization of soft interface |
|
* @dev: registered network device to modify |
|
* |
|
* Return: error code on failures |
|
*/ |
|
static int batadv_softif_init_late(struct net_device *dev) |
|
{ |
|
struct batadv_priv *bat_priv; |
|
u32 random_seqno; |
|
int ret; |
|
size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; |
|
|
|
batadv_set_lockdep_class(dev); |
|
|
|
bat_priv = netdev_priv(dev); |
|
bat_priv->soft_iface = dev; |
|
|
|
/* batadv_interface_stats() needs to be available as soon as |
|
* register_netdevice() has been called |
|
*/ |
|
bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); |
|
if (!bat_priv->bat_counters) |
|
return -ENOMEM; |
|
|
|
atomic_set(&bat_priv->aggregated_ogms, 1); |
|
atomic_set(&bat_priv->bonding, 0); |
|
#ifdef CONFIG_BATMAN_ADV_BLA |
|
atomic_set(&bat_priv->bridge_loop_avoidance, 1); |
|
#endif |
|
#ifdef CONFIG_BATMAN_ADV_DAT |
|
atomic_set(&bat_priv->distributed_arp_table, 1); |
|
#endif |
|
#ifdef CONFIG_BATMAN_ADV_MCAST |
|
atomic_set(&bat_priv->multicast_mode, 1); |
|
atomic_set(&bat_priv->multicast_fanout, 16); |
|
atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); |
|
atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); |
|
atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); |
|
#endif |
|
atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); |
|
atomic_set(&bat_priv->gw.bandwidth_down, 100); |
|
atomic_set(&bat_priv->gw.bandwidth_up, 20); |
|
atomic_set(&bat_priv->orig_interval, 1000); |
|
atomic_set(&bat_priv->hop_penalty, 30); |
|
#ifdef CONFIG_BATMAN_ADV_DEBUG |
|
atomic_set(&bat_priv->log_level, 0); |
|
#endif |
|
atomic_set(&bat_priv->fragmentation, 1); |
|
atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); |
|
atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); |
|
atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); |
|
|
|
atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); |
|
atomic_set(&bat_priv->bcast_seqno, 1); |
|
atomic_set(&bat_priv->tt.vn, 0); |
|
atomic_set(&bat_priv->tt.local_changes, 0); |
|
atomic_set(&bat_priv->tt.ogm_append_cnt, 0); |
|
#ifdef CONFIG_BATMAN_ADV_BLA |
|
atomic_set(&bat_priv->bla.num_requests, 0); |
|
#endif |
|
atomic_set(&bat_priv->tp_num, 0); |
|
|
|
bat_priv->tt.last_changeset = NULL; |
|
bat_priv->tt.last_changeset_len = 0; |
|
bat_priv->isolation_mark = 0; |
|
bat_priv->isolation_mark_mask = 0; |
|
|
|
/* randomize initial seqno to avoid collision */ |
|
get_random_bytes(&random_seqno, sizeof(random_seqno)); |
|
atomic_set(&bat_priv->frag_seqno, random_seqno); |
|
|
|
bat_priv->primary_if = NULL; |
|
|
|
batadv_nc_init_bat_priv(bat_priv); |
|
|
|
if (!bat_priv->algo_ops) { |
|
ret = batadv_algo_select(bat_priv, batadv_routing_algo); |
|
if (ret < 0) |
|
goto free_bat_counters; |
|
} |
|
|
|
ret = batadv_mesh_init(dev); |
|
if (ret < 0) |
|
goto free_bat_counters; |
|
|
|
return 0; |
|
|
|
free_bat_counters: |
|
free_percpu(bat_priv->bat_counters); |
|
bat_priv->bat_counters = NULL; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface |
|
* @dev: batadv_soft_interface used as master interface |
|
* @slave_dev: net_device which should become the slave interface |
|
* @extack: extended ACK report struct |
|
* |
|
* Return: 0 if successful or error otherwise. |
|
*/ |
|
static int batadv_softif_slave_add(struct net_device *dev, |
|
struct net_device *slave_dev, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
int ret = -EINVAL; |
|
|
|
hard_iface = batadv_hardif_get_by_netdev(slave_dev); |
|
if (!hard_iface || hard_iface->soft_iface) |
|
goto out; |
|
|
|
ret = batadv_hardif_enable_interface(hard_iface, dev); |
|
|
|
out: |
|
batadv_hardif_put(hard_iface); |
|
return ret; |
|
} |
|
|
|
/** |
|
* batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface |
|
* @dev: batadv_soft_interface used as master interface |
|
* @slave_dev: net_device which should be removed from the master interface |
|
* |
|
* Return: 0 if successful or error otherwise. |
|
*/ |
|
static int batadv_softif_slave_del(struct net_device *dev, |
|
struct net_device *slave_dev) |
|
{ |
|
struct batadv_hard_iface *hard_iface; |
|
int ret = -EINVAL; |
|
|
|
hard_iface = batadv_hardif_get_by_netdev(slave_dev); |
|
|
|
if (!hard_iface || hard_iface->soft_iface != dev) |
|
goto out; |
|
|
|
batadv_hardif_disable_interface(hard_iface); |
|
ret = 0; |
|
|
|
out: |
|
batadv_hardif_put(hard_iface); |
|
return ret; |
|
} |
|
|
|
static const struct net_device_ops batadv_netdev_ops = { |
|
.ndo_init = batadv_softif_init_late, |
|
.ndo_open = batadv_interface_open, |
|
.ndo_stop = batadv_interface_release, |
|
.ndo_get_stats = batadv_interface_stats, |
|
.ndo_vlan_rx_add_vid = batadv_interface_add_vid, |
|
.ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, |
|
.ndo_set_mac_address = batadv_interface_set_mac_addr, |
|
.ndo_change_mtu = batadv_interface_change_mtu, |
|
.ndo_set_rx_mode = batadv_interface_set_rx_mode, |
|
.ndo_start_xmit = batadv_interface_tx, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_add_slave = batadv_softif_slave_add, |
|
.ndo_del_slave = batadv_softif_slave_del, |
|
}; |
|
|
|
static void batadv_get_drvinfo(struct net_device *dev, |
|
struct ethtool_drvinfo *info) |
|
{ |
|
strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); |
|
strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); |
|
strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); |
|
strscpy(info->bus_info, "batman", sizeof(info->bus_info)); |
|
} |
|
|
|
/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 |
|
* Declare each description string in struct.name[] to get fixed sized buffer |
|
* and compile time checking for strings longer than ETH_GSTRING_LEN. |
|
*/ |
|
static const struct { |
|
const char name[ETH_GSTRING_LEN]; |
|
} batadv_counters_strings[] = { |
|
{ "tx" }, |
|
{ "tx_bytes" }, |
|
{ "tx_dropped" }, |
|
{ "rx" }, |
|
{ "rx_bytes" }, |
|
{ "forward" }, |
|
{ "forward_bytes" }, |
|
{ "mgmt_tx" }, |
|
{ "mgmt_tx_bytes" }, |
|
{ "mgmt_rx" }, |
|
{ "mgmt_rx_bytes" }, |
|
{ "frag_tx" }, |
|
{ "frag_tx_bytes" }, |
|
{ "frag_rx" }, |
|
{ "frag_rx_bytes" }, |
|
{ "frag_fwd" }, |
|
{ "frag_fwd_bytes" }, |
|
{ "tt_request_tx" }, |
|
{ "tt_request_rx" }, |
|
{ "tt_response_tx" }, |
|
{ "tt_response_rx" }, |
|
{ "tt_roam_adv_tx" }, |
|
{ "tt_roam_adv_rx" }, |
|
#ifdef CONFIG_BATMAN_ADV_DAT |
|
{ "dat_get_tx" }, |
|
{ "dat_get_rx" }, |
|
{ "dat_put_tx" }, |
|
{ "dat_put_rx" }, |
|
{ "dat_cached_reply_tx" }, |
|
#endif |
|
#ifdef CONFIG_BATMAN_ADV_NC |
|
{ "nc_code" }, |
|
{ "nc_code_bytes" }, |
|
{ "nc_recode" }, |
|
{ "nc_recode_bytes" }, |
|
{ "nc_buffer" }, |
|
{ "nc_decode" }, |
|
{ "nc_decode_bytes" }, |
|
{ "nc_decode_failed" }, |
|
{ "nc_sniffed" }, |
|
#endif |
|
}; |
|
|
|
static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
|
{ |
|
if (stringset == ETH_SS_STATS) |
|
memcpy(data, batadv_counters_strings, |
|
sizeof(batadv_counters_strings)); |
|
} |
|
|
|
static void batadv_get_ethtool_stats(struct net_device *dev, |
|
struct ethtool_stats *stats, u64 *data) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(dev); |
|
int i; |
|
|
|
for (i = 0; i < BATADV_CNT_NUM; i++) |
|
data[i] = batadv_sum_counter(bat_priv, i); |
|
} |
|
|
|
static int batadv_get_sset_count(struct net_device *dev, int stringset) |
|
{ |
|
if (stringset == ETH_SS_STATS) |
|
return BATADV_CNT_NUM; |
|
|
|
return -EOPNOTSUPP; |
|
} |
|
|
|
static const struct ethtool_ops batadv_ethtool_ops = { |
|
.get_drvinfo = batadv_get_drvinfo, |
|
.get_link = ethtool_op_get_link, |
|
.get_strings = batadv_get_strings, |
|
.get_ethtool_stats = batadv_get_ethtool_stats, |
|
.get_sset_count = batadv_get_sset_count, |
|
}; |
|
|
|
/** |
|
* batadv_softif_free() - Deconstructor of batadv_soft_interface |
|
* @dev: Device to cleanup and remove |
|
*/ |
|
static void batadv_softif_free(struct net_device *dev) |
|
{ |
|
batadv_mesh_free(dev); |
|
|
|
/* some scheduled RCU callbacks need the bat_priv struct to accomplish |
|
* their tasks. Wait for them all to be finished before freeing the |
|
* netdev and its private data (bat_priv) |
|
*/ |
|
rcu_barrier(); |
|
} |
|
|
|
/** |
|
* batadv_softif_init_early() - early stage initialization of soft interface |
|
* @dev: registered network device to modify |
|
*/ |
|
static void batadv_softif_init_early(struct net_device *dev) |
|
{ |
|
ether_setup(dev); |
|
|
|
dev->netdev_ops = &batadv_netdev_ops; |
|
dev->needs_free_netdev = true; |
|
dev->priv_destructor = batadv_softif_free; |
|
dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; |
|
dev->features |= NETIF_F_LLTX; |
|
dev->priv_flags |= IFF_NO_QUEUE; |
|
|
|
/* can't call min_mtu, because the needed variables |
|
* have not been initialized yet |
|
*/ |
|
dev->mtu = ETH_DATA_LEN; |
|
|
|
/* generate random address */ |
|
eth_hw_addr_random(dev); |
|
|
|
dev->ethtool_ops = &batadv_ethtool_ops; |
|
} |
|
|
|
/** |
|
* batadv_softif_validate() - validate configuration of new batadv link |
|
* @tb: IFLA_INFO_DATA netlink attributes |
|
* @data: enum batadv_ifla_attrs attributes |
|
* @extack: extended ACK report struct |
|
* |
|
* Return: 0 if successful or error otherwise. |
|
*/ |
|
static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct batadv_algo_ops *algo_ops; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
if (data[IFLA_BATADV_ALGO_NAME]) { |
|
algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME])); |
|
if (!algo_ops) |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* batadv_softif_newlink() - pre-initialize and register new batadv link |
|
* @src_net: the applicable net namespace |
|
* @dev: network device to register |
|
* @tb: IFLA_INFO_DATA netlink attributes |
|
* @data: enum batadv_ifla_attrs attributes |
|
* @extack: extended ACK report struct |
|
* |
|
* Return: 0 if successful or error otherwise. |
|
*/ |
|
static int batadv_softif_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct batadv_priv *bat_priv = netdev_priv(dev); |
|
const char *algo_name; |
|
int err; |
|
|
|
if (data && data[IFLA_BATADV_ALGO_NAME]) { |
|
algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]); |
|
err = batadv_algo_select(bat_priv, algo_name); |
|
if (err) |
|
return -EINVAL; |
|
} |
|
|
|
return register_netdevice(dev); |
|
} |
|
|
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/** |
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* batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via |
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* netlink |
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* @soft_iface: the to-be-removed batman-adv interface |
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* @head: list pointer |
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*/ |
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static void batadv_softif_destroy_netlink(struct net_device *soft_iface, |
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struct list_head *head) |
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{ |
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struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
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struct batadv_hard_iface *hard_iface; |
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struct batadv_softif_vlan *vlan; |
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list_for_each_entry(hard_iface, &batadv_hardif_list, list) { |
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if (hard_iface->soft_iface == soft_iface) |
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batadv_hardif_disable_interface(hard_iface); |
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} |
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/* destroy the "untagged" VLAN */ |
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vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); |
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if (vlan) { |
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batadv_softif_destroy_vlan(bat_priv, vlan); |
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batadv_softif_vlan_put(vlan); |
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} |
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unregister_netdevice_queue(soft_iface, head); |
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} |
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|
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/** |
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* batadv_softif_is_valid() - Check whether device is a batadv soft interface |
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* @net_dev: device which should be checked |
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* |
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* Return: true when net_dev is a batman-adv interface, false otherwise |
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*/ |
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bool batadv_softif_is_valid(const struct net_device *net_dev) |
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{ |
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if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) |
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return true; |
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|
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return false; |
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} |
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static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = { |
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[IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING }, |
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}; |
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struct rtnl_link_ops batadv_link_ops __read_mostly = { |
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.kind = "batadv", |
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.priv_size = sizeof(struct batadv_priv), |
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.setup = batadv_softif_init_early, |
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.maxtype = IFLA_BATADV_MAX, |
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.policy = batadv_ifla_policy, |
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.validate = batadv_softif_validate, |
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.newlink = batadv_softif_newlink, |
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.dellink = batadv_softif_destroy_netlink, |
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};
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