| /* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: |
| * |
| * Marek Lindner, Simon Wunderlich |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "soft-interface.h" |
| #include "main.h" |
| |
| #include <linux/atomic.h> |
| #include <linux/byteorder/generic.h> |
| #include <linux/cache.h> |
| #include <linux/compiler.h> |
| #include <linux/errno.h> |
| #include <linux/etherdevice.h> |
| #include <linux/ethtool.h> |
| #include <linux/fs.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_vlan.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/lockdep.h> |
| #include <linux/netdevice.h> |
| #include <linux/percpu.h> |
| #include <linux/printk.h> |
| #include <linux/random.h> |
| #include <linux/rculist.h> |
| #include <linux/rcupdate.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <linux/socket.h> |
| #include <linux/spinlock.h> |
| #include <linux/stddef.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| |
| #include "bridge_loop_avoidance.h" |
| #include "debugfs.h" |
| #include "distributed-arp-table.h" |
| #include "gateway_client.h" |
| #include "gateway_common.h" |
| #include "hard-interface.h" |
| #include "multicast.h" |
| #include "network-coding.h" |
| #include "packet.h" |
| #include "send.h" |
| #include "sysfs.h" |
| #include "translation-table.h" |
| |
| static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); |
| static void batadv_get_drvinfo(struct net_device *dev, |
| struct ethtool_drvinfo *info); |
| static u32 batadv_get_msglevel(struct net_device *dev); |
| static void batadv_set_msglevel(struct net_device *dev, u32 value); |
| static u32 batadv_get_link(struct net_device *dev); |
| static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); |
| static void batadv_get_ethtool_stats(struct net_device *dev, |
| struct ethtool_stats *stats, u64 *data); |
| static int batadv_get_sset_count(struct net_device *dev, int stringset); |
| |
| static const struct ethtool_ops batadv_ethtool_ops = { |
| .get_settings = batadv_get_settings, |
| .get_drvinfo = batadv_get_drvinfo, |
| .get_msglevel = batadv_get_msglevel, |
| .set_msglevel = batadv_set_msglevel, |
| .get_link = batadv_get_link, |
| .get_strings = batadv_get_strings, |
| .get_ethtool_stats = batadv_get_ethtool_stats, |
| .get_sset_count = batadv_get_sset_count, |
| }; |
| |
| int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) |
| { |
| int result; |
| |
| /* TODO: We must check if we can release all references to non-payload |
| * data using skb_header_release in our skbs to allow skb_cow_header to |
| * work optimally. This means that those skbs are not allowed to read |
| * or write any data which is before the current position of skb->data |
| * after that call and thus allow other skbs with the same data buffer |
| * to write freely in that area. |
| */ |
| result = skb_cow_head(skb, len); |
| if (result < 0) |
| return result; |
| |
| skb_push(skb, len); |
| return 0; |
| } |
| |
| static int batadv_interface_open(struct net_device *dev) |
| { |
| netif_start_queue(dev); |
| return 0; |
| } |
| |
| static int batadv_interface_release(struct net_device *dev) |
| { |
| netif_stop_queue(dev); |
| return 0; |
| } |
| |
| static struct net_device_stats *batadv_interface_stats(struct net_device *dev) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(dev); |
| struct net_device_stats *stats = &bat_priv->stats; |
| |
| stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); |
| stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); |
| stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); |
| stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); |
| stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); |
| return stats; |
| } |
| |
| static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(dev); |
| struct batadv_softif_vlan *vlan; |
| struct sockaddr *addr = p; |
| u8 old_addr[ETH_ALEN]; |
| |
| if (!is_valid_ether_addr(addr->sa_data)) |
| return -EADDRNOTAVAIL; |
| |
| ether_addr_copy(old_addr, dev->dev_addr); |
| ether_addr_copy(dev->dev_addr, addr->sa_data); |
| |
| /* only modify transtable if it has been initialized before */ |
| if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
| return 0; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { |
| batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, |
| "mac address changed", false); |
| batadv_tt_local_add(dev, addr->sa_data, vlan->vid, |
| BATADV_NULL_IFINDEX, BATADV_NO_MARK); |
| } |
| rcu_read_unlock(); |
| |
| return 0; |
| } |
| |
| static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| /* check ranges */ |
| if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) |
| return -EINVAL; |
| |
| dev->mtu = new_mtu; |
| |
| return 0; |
| } |
| |
| /** |
| * batadv_interface_set_rx_mode - set the rx mode of a device |
| * @dev: registered network device to modify |
| * |
| * We do not actually need to set any rx filters for the virtual batman |
| * soft interface. However a dummy handler enables a user to set static |
| * multicast listeners for instance. |
| */ |
| static void batadv_interface_set_rx_mode(struct net_device *dev) |
| { |
| } |
| |
| static int batadv_interface_tx(struct sk_buff *skb, |
| struct net_device *soft_iface) |
| { |
| struct ethhdr *ethhdr; |
| struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
| struct batadv_hard_iface *primary_if = NULL; |
| struct batadv_bcast_packet *bcast_packet; |
| __be16 ethertype = htons(ETH_P_BATMAN); |
| static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, |
| 0x00, 0x00}; |
| static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, |
| 0x00, 0x00}; |
| enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; |
| u8 *dst_hint = NULL, chaddr[ETH_ALEN]; |
| struct vlan_ethhdr *vhdr; |
| unsigned int header_len = 0; |
| int data_len = skb->len, ret; |
| unsigned long brd_delay = 1; |
| bool do_bcast = false, client_added; |
| unsigned short vid; |
| u32 seqno; |
| int gw_mode; |
| enum batadv_forw_mode forw_mode; |
| struct batadv_orig_node *mcast_single_orig = NULL; |
| int network_offset = ETH_HLEN; |
| |
| if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) |
| goto dropped; |
| |
| soft_iface->trans_start = jiffies; |
| vid = batadv_get_vid(skb, 0); |
| ethhdr = eth_hdr(skb); |
| |
| switch (ntohs(ethhdr->h_proto)) { |
| case ETH_P_8021Q: |
| vhdr = vlan_eth_hdr(skb); |
| |
| if (vhdr->h_vlan_encapsulated_proto != ethertype) { |
| network_offset += VLAN_HLEN; |
| break; |
| } |
| |
| /* fall through */ |
| case ETH_P_BATMAN: |
| goto dropped; |
| } |
| |
| skb_set_network_header(skb, network_offset); |
| |
| if (batadv_bla_tx(bat_priv, skb, vid)) |
| goto dropped; |
| |
| /* skb->data might have been reallocated by batadv_bla_tx() */ |
| ethhdr = eth_hdr(skb); |
| |
| /* Register the client MAC in the transtable */ |
| if (!is_multicast_ether_addr(ethhdr->h_source)) { |
| client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, |
| vid, skb->skb_iif, |
| skb->mark); |
| if (!client_added) |
| goto dropped; |
| } |
| |
| /* don't accept stp packets. STP does not help in meshes. |
| * better use the bridge loop avoidance ... |
| * |
| * The same goes for ECTP sent at least by some Cisco Switches, |
| * it might confuse the mesh when used with bridge loop avoidance. |
| */ |
| if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) |
| goto dropped; |
| |
| if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) |
| goto dropped; |
| |
| gw_mode = atomic_read(&bat_priv->gw_mode); |
| if (is_multicast_ether_addr(ethhdr->h_dest)) { |
| /* if gw mode is off, broadcast every packet */ |
| if (gw_mode == BATADV_GW_MODE_OFF) { |
| do_bcast = true; |
| goto send; |
| } |
| |
| dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, |
| chaddr); |
| /* skb->data may have been modified by |
| * batadv_gw_dhcp_recipient_get() |
| */ |
| ethhdr = eth_hdr(skb); |
| /* if gw_mode is on, broadcast any non-DHCP message. |
| * All the DHCP packets are going to be sent as unicast |
| */ |
| if (dhcp_rcp == BATADV_DHCP_NO) { |
| do_bcast = true; |
| goto send; |
| } |
| |
| if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) |
| dst_hint = chaddr; |
| else if ((gw_mode == BATADV_GW_MODE_SERVER) && |
| (dhcp_rcp == BATADV_DHCP_TO_SERVER)) |
| /* gateways should not forward any DHCP message if |
| * directed to a DHCP server |
| */ |
| goto dropped; |
| |
| send: |
| if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { |
| forw_mode = batadv_mcast_forw_mode(bat_priv, skb, |
| &mcast_single_orig); |
| if (forw_mode == BATADV_FORW_NONE) |
| goto dropped; |
| |
| if (forw_mode == BATADV_FORW_SINGLE) |
| do_bcast = false; |
| } |
| } |
| |
| batadv_skb_set_priority(skb, 0); |
| |
| /* ethernet packet should be broadcasted */ |
| if (do_bcast) { |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| goto dropped; |
| |
| /* in case of ARP request, we do not immediately broadcasti the |
| * packet, instead we first wait for DAT to try to retrieve the |
| * correct ARP entry |
| */ |
| if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) |
| brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); |
| |
| if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) |
| goto dropped; |
| |
| bcast_packet = (struct batadv_bcast_packet *)skb->data; |
| bcast_packet->version = BATADV_COMPAT_VERSION; |
| bcast_packet->ttl = BATADV_TTL; |
| |
| /* batman packet type: broadcast */ |
| bcast_packet->packet_type = BATADV_BCAST; |
| bcast_packet->reserved = 0; |
| |
| /* hw address of first interface is the orig mac because only |
| * this mac is known throughout the mesh |
| */ |
| ether_addr_copy(bcast_packet->orig, |
| primary_if->net_dev->dev_addr); |
| |
| /* set broadcast sequence number */ |
| seqno = atomic_inc_return(&bat_priv->bcast_seqno); |
| bcast_packet->seqno = htonl(seqno); |
| |
| batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); |
| |
| /* a copy is stored in the bcast list, therefore removing |
| * the original skb. |
| */ |
| kfree_skb(skb); |
| |
| /* unicast packet */ |
| } else { |
| /* DHCP packets going to a server will use the GW feature */ |
| if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { |
| ret = batadv_gw_out_of_range(bat_priv, skb); |
| if (ret) |
| goto dropped; |
| ret = batadv_send_skb_via_gw(bat_priv, skb, vid); |
| } else if (mcast_single_orig) { |
| ret = batadv_send_skb_unicast(bat_priv, skb, |
| BATADV_UNICAST, 0, |
| mcast_single_orig, vid); |
| } else { |
| if (batadv_dat_snoop_outgoing_arp_request(bat_priv, |
| skb)) |
| goto dropped; |
| |
| batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); |
| |
| ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, |
| vid); |
| } |
| if (ret == NET_XMIT_DROP) |
| goto dropped_freed; |
| } |
| |
| batadv_inc_counter(bat_priv, BATADV_CNT_TX); |
| batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); |
| goto end; |
| |
| dropped: |
| kfree_skb(skb); |
| dropped_freed: |
| batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); |
| end: |
| if (primary_if) |
| batadv_hardif_free_ref(primary_if); |
| return NETDEV_TX_OK; |
| } |
| |
| void batadv_interface_rx(struct net_device *soft_iface, |
| struct sk_buff *skb, struct batadv_hard_iface *recv_if, |
| int hdr_size, struct batadv_orig_node *orig_node) |
| { |
| struct batadv_bcast_packet *batadv_bcast_packet; |
| struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
| __be16 ethertype = htons(ETH_P_BATMAN); |
| struct vlan_ethhdr *vhdr; |
| struct ethhdr *ethhdr; |
| unsigned short vid; |
| bool is_bcast; |
| |
| batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; |
| is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); |
| |
| /* check if enough space is available for pulling, and pull */ |
| if (!pskb_may_pull(skb, hdr_size)) |
| goto dropped; |
| |
| skb_pull_rcsum(skb, hdr_size); |
| skb_reset_mac_header(skb); |
| |
| /* clean the netfilter state now that the batman-adv header has been |
| * removed |
| */ |
| nf_reset(skb); |
| |
| if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
| goto dropped; |
| |
| vid = batadv_get_vid(skb, 0); |
| ethhdr = eth_hdr(skb); |
| |
| switch (ntohs(ethhdr->h_proto)) { |
| case ETH_P_8021Q: |
| if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) |
| goto dropped; |
| |
| vhdr = (struct vlan_ethhdr *)skb->data; |
| |
| if (vhdr->h_vlan_encapsulated_proto != ethertype) |
| break; |
| |
| /* fall through */ |
| case ETH_P_BATMAN: |
| goto dropped; |
| } |
| |
| /* skb->dev & skb->pkt_type are set here */ |
| skb->protocol = eth_type_trans(skb, soft_iface); |
| skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| |
| batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
| batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
| skb->len + ETH_HLEN); |
| |
| soft_iface->last_rx = jiffies; |
| |
| /* Let the bridge loop avoidance check the packet. If will |
| * not handle it, we can safely push it up. |
| */ |
| if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) |
| goto out; |
| |
| if (orig_node) |
| batadv_tt_add_temporary_global_entry(bat_priv, orig_node, |
| ethhdr->h_source, vid); |
| |
| if (is_multicast_ether_addr(ethhdr->h_dest)) { |
| /* set the mark on broadcast packets if AP isolation is ON and |
| * the packet is coming from an "isolated" client |
| */ |
| if (batadv_vlan_ap_isola_get(bat_priv, vid) && |
| batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, |
| vid)) { |
| /* save bits in skb->mark not covered by the mask and |
| * apply the mark on the rest |
| */ |
| skb->mark &= ~bat_priv->isolation_mark_mask; |
| skb->mark |= bat_priv->isolation_mark; |
| } |
| } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, |
| ethhdr->h_dest, vid)) { |
| goto dropped; |
| } |
| |
| netif_rx(skb); |
| goto out; |
| |
| dropped: |
| kfree_skb(skb); |
| out: |
| return; |
| } |
| |
| /** |
| * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and |
| * possibly free it |
| * @softif_vlan: the vlan object to release |
| */ |
| void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) |
| { |
| if (!vlan) |
| return; |
| |
| if (atomic_dec_and_test(&vlan->refcount)) { |
| spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); |
| hlist_del_rcu(&vlan->list); |
| spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); |
| |
| kfree_rcu(vlan, rcu); |
| } |
| } |
| |
| /** |
| * 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 |
| * |
| * Returns the private data of the vlan matching the vid passed as argument or |
| * 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; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { |
| if (vlan_tmp->vid != vid) |
| continue; |
| |
| if (!atomic_inc_not_zero(&vlan_tmp->refcount)) |
| continue; |
| |
| vlan = vlan_tmp; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| return vlan; |
| } |
| |
| /** |
| * batadv_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 |
| * |
| * Returns 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; |
| int err; |
| |
| vlan = batadv_softif_vlan_get(bat_priv, vid); |
| if (vlan) { |
| batadv_softif_vlan_free_ref(vlan); |
| return -EEXIST; |
| } |
| |
| vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); |
| if (!vlan) |
| return -ENOMEM; |
| |
| vlan->bat_priv = bat_priv; |
| vlan->vid = vid; |
| atomic_set(&vlan->refcount, 1); |
| |
| atomic_set(&vlan->ap_isolation, 0); |
| |
| err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); |
| if (err) { |
| kfree(vlan); |
| return err; |
| } |
| |
| spin_lock_bh(&bat_priv->softif_vlan_list_lock); |
| 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); |
| |
| 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_sysfs_del_vlan(bat_priv, vlan); |
| batadv_softif_vlan_free_ref(vlan); |
| } |
| |
| /** |
| * batadv_interface_add_vid - ndo_add_vid API implementation |
| * @dev: the netdev of the mesh interface |
| * @vid: identifier of the new vlan |
| * |
| * Set up all the internal structures for handling the new vlan on top of the |
| * mesh interface |
| * |
| * Returns 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; |
| int ret; |
| |
| /* 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); |
| |
| /* recreate the sysfs object if it was already destroyed (and it should |
| * be since we received a kill_vid() for this vlan |
| */ |
| if (!vlan->kobj) { |
| ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); |
| if (ret) { |
| batadv_softif_vlan_free_ref(vlan); |
| return ret; |
| } |
| } |
| |
| /* 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 |
| * @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 |
| * |
| * Returns 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_free_ref(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_destroy_finish - cleans up the remains of a softif |
| * @work: work queue item |
| * |
| * Free the parts of the soft interface which can not be removed under |
| * rtnl lock (to prevent deadlock situations). |
| */ |
| static void batadv_softif_destroy_finish(struct work_struct *work) |
| { |
| struct batadv_softif_vlan *vlan; |
| struct batadv_priv *bat_priv; |
| struct net_device *soft_iface; |
| |
| bat_priv = container_of(work, struct batadv_priv, |
| cleanup_work); |
| soft_iface = bat_priv->soft_iface; |
| |
| /* destroy the "untagged" VLAN */ |
| vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); |
| if (vlan) { |
| batadv_softif_destroy_vlan(bat_priv, vlan); |
| batadv_softif_vlan_free_ref(vlan); |
| } |
| |
| batadv_sysfs_del_meshif(soft_iface); |
| unregister_netdev(soft_iface); |
| } |
| |
| /** |
| * batadv_softif_init_late - late stage initialization of soft interface |
| * @dev: registered network device to modify |
| * |
| * Returns 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; |
| INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); |
| |
| /* 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 |
| bat_priv->mcast.flags = BATADV_NO_FLAGS; |
| atomic_set(&bat_priv->multicast_mode, 1); |
| atomic_set(&bat_priv->mcast.num_disabled, 0); |
| 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_sel_class, 20); |
| 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 |
| 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; |
| bat_priv->num_ifaces = 0; |
| |
| batadv_nc_init_bat_priv(bat_priv); |
| |
| ret = batadv_algo_select(bat_priv, batadv_routing_algo); |
| if (ret < 0) |
| goto free_bat_counters; |
| |
| ret = batadv_debugfs_add_meshif(dev); |
| if (ret < 0) |
| goto free_bat_counters; |
| |
| ret = batadv_mesh_init(dev); |
| if (ret < 0) |
| goto unreg_debugfs; |
| |
| return 0; |
| |
| unreg_debugfs: |
| batadv_debugfs_del_meshif(dev); |
| 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 |
| * |
| * Return 0 if successful or error otherwise. |
| */ |
| static int batadv_softif_slave_add(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) |
| goto out; |
| |
| ret = batadv_hardif_enable_interface(hard_iface, dev->name); |
| |
| out: |
| if (hard_iface) |
| batadv_hardif_free_ref(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, BATADV_IF_CLEANUP_KEEP); |
| ret = 0; |
| |
| out: |
| if (hard_iface) |
| batadv_hardif_free_ref(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, |
| }; |
| |
| /** |
| * batadv_softif_free - Deconstructor of batadv_soft_interface |
| * @dev: Device to cleanup and remove |
| */ |
| static void batadv_softif_free(struct net_device *dev) |
| { |
| batadv_debugfs_del_meshif(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(); |
| |
| free_netdev(dev); |
| } |
| |
| /** |
| * 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) |
| { |
| struct batadv_priv *priv = netdev_priv(dev); |
| |
| ether_setup(dev); |
| |
| dev->netdev_ops = &batadv_netdev_ops; |
| dev->destructor = batadv_softif_free; |
| dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
| 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; |
| |
| memset(priv, 0, sizeof(*priv)); |
| } |
| |
| struct net_device *batadv_softif_create(const char *name) |
| { |
| struct net_device *soft_iface; |
| int ret; |
| |
| soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, |
| NET_NAME_UNKNOWN, batadv_softif_init_early); |
| if (!soft_iface) |
| return NULL; |
| |
| soft_iface->rtnl_link_ops = &batadv_link_ops; |
| |
| ret = register_netdevice(soft_iface); |
| if (ret < 0) { |
| pr_err("Unable to register the batman interface '%s': %i\n", |
| name, ret); |
| free_netdev(soft_iface); |
| return NULL; |
| } |
| |
| return soft_iface; |
| } |
| |
| /** |
| * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs |
| * @soft_iface: the to-be-removed batman-adv interface |
| */ |
| void batadv_softif_destroy_sysfs(struct net_device *soft_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
| |
| queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); |
| } |
| |
| /** |
| * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink |
| * @soft_iface: the to-be-removed batman-adv interface |
| * @head: list pointer |
| */ |
| static void batadv_softif_destroy_netlink(struct net_device *soft_iface, |
| struct list_head *head) |
| { |
| struct batadv_hard_iface *hard_iface; |
| |
| list_for_each_entry(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->soft_iface == soft_iface) |
| batadv_hardif_disable_interface(hard_iface, |
| BATADV_IF_CLEANUP_KEEP); |
| } |
| |
| batadv_sysfs_del_meshif(soft_iface); |
| unregister_netdevice_queue(soft_iface, head); |
| } |
| |
| int batadv_softif_is_valid(const struct net_device *net_dev) |
| { |
| if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) |
| return 1; |
| |
| return 0; |
| } |
| |
| struct rtnl_link_ops batadv_link_ops __read_mostly = { |
| .kind = "batadv", |
| .priv_size = sizeof(struct batadv_priv), |
| .setup = batadv_softif_init_early, |
| .dellink = batadv_softif_destroy_netlink, |
| }; |
| |
| /* ethtool */ |
| static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| { |
| cmd->supported = 0; |
| cmd->advertising = 0; |
| ethtool_cmd_speed_set(cmd, SPEED_10); |
| cmd->duplex = DUPLEX_FULL; |
| cmd->port = PORT_TP; |
| cmd->phy_address = 0; |
| cmd->transceiver = XCVR_INTERNAL; |
| cmd->autoneg = AUTONEG_DISABLE; |
| cmd->maxtxpkt = 0; |
| cmd->maxrxpkt = 0; |
| |
| return 0; |
| } |
| |
| static void batadv_get_drvinfo(struct net_device *dev, |
| struct ethtool_drvinfo *info) |
| { |
| strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); |
| strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); |
| strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); |
| strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); |
| } |
| |
| static u32 batadv_get_msglevel(struct net_device *dev) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static void batadv_set_msglevel(struct net_device *dev, u32 value) |
| { |
| } |
| |
| static u32 batadv_get_link(struct net_device *dev) |
| { |
| return 1; |
| } |
| |
| /* 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; |
| } |