--- /dev/null
- dev->netns_local = true;
+ // SPDX-License-Identifier: GPL-2.0
+ /* Copyright (C) B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ */
+
+ #include "mesh-interface.h"
+ #include "main.h"
+
+ #include <linux/atomic.h>
+ #include <linux/byteorder/generic.h>
+ #include <linux/cache.h>
+ #include <linux/compiler.h>
+ #include <linux/container_of.h>
+ #include <linux/cpumask.h>
+ #include <linux/errno.h>
+ #include <linux/etherdevice.h>
+ #include <linux/ethtool.h>
+ #include <linux/gfp.h>
+ #include <linux/if_ether.h>
+ #include <linux/if_vlan.h>
+ #include <linux/jiffies.h>
+ #include <linux/kref.h>
+ #include <linux/list.h>
+ #include <linux/lockdep.h>
+ #include <linux/netdevice.h>
+ #include <linux/netlink.h>
+ #include <linux/percpu.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 <net/net_namespace.h>
+ #include <net/netlink.h>
+ #include <uapi/linux/batadv_packet.h>
+ #include <uapi/linux/batman_adv.h>
+
+ #include "bat_algo.h"
+ #include "bridge_loop_avoidance.h"
+ #include "distributed-arp-table.h"
+ #include "gateway_client.h"
+ #include "hard-interface.h"
+ #include "multicast.h"
+ #include "network-coding.h"
+ #include "send.h"
+ #include "translation-table.h"
+
+ /**
+ * batadv_skb_head_push() - Increase header size and move (push) head pointer
+ * @skb: packet buffer which should be modified
+ * @len: number of bytes to add
+ *
+ * Return: 0 on success or negative error number in case of failure
+ */
+ 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;
+ }
+
+ /**
+ * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
+ * @bat_priv: the bat priv with all the mesh interface information
+ * @idx: index of counter to sum up
+ *
+ * Return: sum of all cpu-local counters
+ */
+ static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx)
+ {
+ u64 *counters, sum = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
+ sum += counters[idx];
+ }
+
+ return sum;
+ }
+
+ 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 = &dev->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_meshif_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);
+ eth_hw_addr_set(dev, 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->meshif_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)
+ {
+ struct batadv_priv *bat_priv = netdev_priv(dev);
+
+ /* check ranges */
+ if (new_mtu < ETH_MIN_MTU || new_mtu > batadv_hardif_min_mtu(dev))
+ return -EINVAL;
+
+ WRITE_ONCE(dev->mtu, new_mtu);
+ bat_priv->mtu_set_by_user = 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
+ * mesh 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 netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
+ struct net_device *mesh_iface)
+ {
+ struct ethhdr *ethhdr;
+ struct batadv_priv *bat_priv = netdev_priv(mesh_iface);
+ struct batadv_hard_iface *primary_if = NULL;
+ struct batadv_bcast_packet *bcast_packet;
+ 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 = 0;
+ bool do_bcast = false, client_added;
+ unsigned short vid;
+ u32 seqno;
+ int gw_mode;
+ enum batadv_forw_mode forw_mode = BATADV_FORW_BCAST;
+ int mcast_is_routable = 0;
+ int network_offset = ETH_HLEN;
+ __be16 proto;
+
+ if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+ goto dropped;
+
+ /* reset control block to avoid left overs from previous users */
+ memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
+
+ netif_trans_update(mesh_iface);
+ vid = batadv_get_vid(skb, 0);
+
+ skb_reset_mac_header(skb);
+ ethhdr = eth_hdr(skb);
+
+ proto = ethhdr->h_proto;
+
+ switch (ntohs(proto)) {
+ case ETH_P_8021Q:
+ if (!pskb_may_pull(skb, sizeof(*vhdr)))
+ goto dropped;
+ vhdr = vlan_eth_hdr(skb);
+ proto = vhdr->h_vlan_encapsulated_proto;
+
+ /* drop batman-in-batman packets to prevent loops */
+ if (proto != htons(ETH_P_BATMAN)) {
+ network_offset += VLAN_HLEN;
+ break;
+ }
+
+ fallthrough;
+ 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) &&
+ !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
+ client_added = batadv_tt_local_add(mesh_iface, ethhdr->h_source,
+ vid, skb->skb_iif,
+ skb->mark);
+ if (!client_added)
+ goto dropped;
+ }
+
+ /* Snoop address candidates from DHCPACKs for early DAT filling */
+ batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid);
+
+ /* 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, vid,
+ &mcast_is_routable);
+ switch (forw_mode) {
+ case BATADV_FORW_BCAST:
+ break;
+ case BATADV_FORW_UCASTS:
+ case BATADV_FORW_MCAST:
+ do_bcast = false;
+ break;
+ case BATADV_FORW_NONE:
+ fallthrough;
+ default:
+ goto dropped;
+ }
+ }
+ }
+
+ 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 - 1;
+
+ /* 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_send_bcast_packet(bat_priv, skb, brd_delay, true);
+ /* 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 (forw_mode == BATADV_FORW_UCASTS) {
+ ret = batadv_mcast_forw_send(bat_priv, skb, vid,
+ mcast_is_routable);
+ } else if (forw_mode == BATADV_FORW_MCAST) {
+ ret = batadv_mcast_forw_mcsend(bat_priv, skb);
+ } 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_SUCCESS)
+ 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:
+ batadv_hardif_put(primary_if);
+ return NETDEV_TX_OK;
+ }
+
+ /**
+ * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
+ * @mesh_iface: local interface which will receive the ethernet frame
+ * @skb: ethernet frame for @mesh_iface
+ * @hdr_size: size of already parsed batman-adv header
+ * @orig_node: originator from which the batman-adv packet was sent
+ *
+ * Sends an ethernet frame to the receive path of the local @mesh_iface.
+ * skb->data has still point to the batman-adv header with the size @hdr_size.
+ * The caller has to have parsed this header already and made sure that at least
+ * @hdr_size bytes are still available for pull in @skb.
+ *
+ * The packet may still get dropped. This can happen when the encapsulated
+ * ethernet frame is invalid or contains again an batman-adv packet. Also
+ * unicast packets will be dropped directly when it was sent between two
+ * isolated clients.
+ */
+ void batadv_interface_rx(struct net_device *mesh_iface,
+ struct sk_buff *skb, int hdr_size,
+ struct batadv_orig_node *orig_node)
+ {
+ struct batadv_bcast_packet *batadv_bcast_packet;
+ struct batadv_priv *bat_priv = netdev_priv(mesh_iface);
+ struct vlan_ethhdr *vhdr;
+ struct ethhdr *ethhdr;
+ unsigned short vid;
+ int packet_type;
+
+ batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
+ packet_type = batadv_bcast_packet->packet_type;
+
+ 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_ct(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 = skb_vlan_eth_hdr(skb);
+
+ /* drop batman-in-batman packets to prevent loops */
+ if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
+ break;
+
+ fallthrough;
+ case ETH_P_BATMAN:
+ goto dropped;
+ }
+
+ /* skb->dev & skb->pkt_type are set here */
+ skb->protocol = eth_type_trans(skb, mesh_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);
+
+ /* 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, packet_type))
+ 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_meshif_vlan_release() - release vlan from lists and queue for free
+ * after rcu grace period
+ * @ref: kref pointer of the vlan object
+ */
+ void batadv_meshif_vlan_release(struct kref *ref)
+ {
+ struct batadv_meshif_vlan *vlan;
+
+ vlan = container_of(ref, struct batadv_meshif_vlan, refcount);
+
+ spin_lock_bh(&vlan->bat_priv->meshif_vlan_list_lock);
+ hlist_del_rcu(&vlan->list);
+ spin_unlock_bh(&vlan->bat_priv->meshif_vlan_list_lock);
+
+ kfree_rcu(vlan, rcu);
+ }
+
+ /**
+ * batadv_meshif_vlan_get() - get the vlan object for a specific vid
+ * @bat_priv: the bat priv with all the mesh interface information
+ * @vid: the identifier of the vlan object to retrieve
+ *
+ * Return: 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_meshif_vlan *batadv_meshif_vlan_get(struct batadv_priv *bat_priv,
+ unsigned short vid)
+ {
+ struct batadv_meshif_vlan *vlan_tmp, *vlan = NULL;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->meshif_vlan_list, list) {
+ 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_meshif_create_vlan() - allocate the needed resources for a new vlan
+ * @bat_priv: the bat priv with all the mesh interface information
+ * @vid: the VLAN identifier
+ *
+ * Return: 0 on success, a negative error otherwise.
+ */
+ int batadv_meshif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
+ {
+ struct batadv_meshif_vlan *vlan;
+
+ spin_lock_bh(&bat_priv->meshif_vlan_list_lock);
+
+ vlan = batadv_meshif_vlan_get(bat_priv, vid);
+ if (vlan) {
+ batadv_meshif_vlan_put(vlan);
+ spin_unlock_bh(&bat_priv->meshif_vlan_list_lock);
+ return -EEXIST;
+ }
+
+ vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
+ if (!vlan) {
+ spin_unlock_bh(&bat_priv->meshif_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->meshif_vlan_list);
+ spin_unlock_bh(&bat_priv->meshif_vlan_list_lock);
+
+ /* add a new TT local entry. This one will be marked with the NOPURGE
+ * flag
+ */
+ batadv_tt_local_add(bat_priv->mesh_iface,
+ bat_priv->mesh_iface->dev_addr, vid,
+ BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+
+ /* don't return reference to new meshif_vlan */
+ batadv_meshif_vlan_put(vlan);
+
+ return 0;
+ }
+
+ /**
+ * batadv_meshif_destroy_vlan() - remove and destroy a meshif_vlan object
+ * @bat_priv: the bat priv with all the mesh interface information
+ * @vlan: the object to remove
+ */
+ static void batadv_meshif_destroy_vlan(struct batadv_priv *bat_priv,
+ struct batadv_meshif_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->mesh_iface->dev_addr,
+ vlan->vid, "vlan interface destroyed", false);
+
+ batadv_meshif_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_meshif_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 0 is only used to indicate "priority tag" frames which only
+ * contain priority information and no VID. No management structures
+ * should be created for this VID and it should be handled like an
+ * untagged frame.
+ */
+ if (vid == 0)
+ return 0;
+
+ 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_meshif_vlan_get() increases the
+ * refcount in order to revive the object.
+ *
+ * if it does not exist then create it.
+ */
+ vlan = batadv_meshif_vlan_get(bat_priv, vid);
+ if (!vlan)
+ return batadv_meshif_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->mesh_iface,
+ bat_priv->mesh_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_meshif_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;
+
+ /* "priority tag" frames are handled like "untagged" frames
+ * and no meshif_vlan needs to be destroyed
+ */
+ if (vid == 0)
+ return 0;
+
+ vlan = batadv_meshif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
+ if (!vlan)
+ return -ENOENT;
+
+ batadv_meshif_destroy_vlan(bat_priv, vlan);
+
+ /* finally free the vlan object */
+ batadv_meshif_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_meshif_init_late() - late stage initialization of mesh interface
+ * @dev: registered network device to modify
+ *
+ * Return: error code on failures
+ */
+ static int batadv_meshif_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->mesh_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);
+ atomic_set(&bat_priv->mcast.num_no_mc_ptype_capa, 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, BATADV_MAX_MTU);
+ 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.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);
+
+ WRITE_ONCE(bat_priv->tt.local_changes, 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_meshif_slave_add() - Add a slave interface to a batadv_mesh_interface
+ * @dev: batadv_mesh_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_meshif_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->mesh_iface)
+ goto out;
+
+ ret = batadv_hardif_enable_interface(hard_iface, dev);
+
+ out:
+ batadv_hardif_put(hard_iface);
+ return ret;
+ }
+
+ /**
+ * batadv_meshif_slave_del() - Delete a slave iface from a batadv_mesh_interface
+ * @dev: batadv_mesh_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_meshif_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->mesh_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_meshif_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_meshif_slave_add,
+ .ndo_del_slave = batadv_meshif_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_MCAST
+ { "mcast_tx" },
+ { "mcast_tx_bytes" },
+ { "mcast_tx_local" },
+ { "mcast_tx_local_bytes" },
+ { "mcast_rx" },
+ { "mcast_rx_bytes" },
+ { "mcast_rx_local" },
+ { "mcast_rx_local_bytes" },
+ { "mcast_fwd" },
+ { "mcast_fwd_bytes" },
+ #endif
+ #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_meshif_free() - Deconstructor of batadv_mesh_interface
+ * @dev: Device to cleanup and remove
+ */
+ static void batadv_meshif_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_meshif_init_early() - early stage initialization of mesh interface
+ * @dev: registered network device to modify
+ */
+ static void batadv_meshif_init_early(struct net_device *dev)
+ {
+ ether_setup(dev);
+
+ dev->netdev_ops = &batadv_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->priv_destructor = batadv_meshif_free;
+ dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
+ dev->priv_flags |= IFF_NO_QUEUE;
+ dev->lltx = true;
++ dev->netns_immutable = true;
+
+ /* can't call min_mtu, because the needed variables
+ * have not been initialized yet
+ */
+ dev->mtu = ETH_DATA_LEN;
+ dev->max_mtu = BATADV_MAX_MTU;
+
+ /* generate random address */
+ eth_hw_addr_random(dev);
+
+ dev->ethtool_ops = &batadv_ethtool_ops;
+ }
+
+ /**
+ * batadv_meshif_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_meshif_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_meshif_newlink() - pre-initialize and register new batadv link
+ * @dev: network device to register
+ * @params: rtnl newlink parameters
+ * @extack: extended ACK report struct
+ *
+ * Return: 0 if successful or error otherwise.
+ */
+ static int batadv_meshif_newlink(struct net_device *dev,
+ struct rtnl_newlink_params *params,
+ struct netlink_ext_ack *extack)
+ {
+ struct batadv_priv *bat_priv = netdev_priv(dev);
+ struct nlattr **data = params->data;
+ 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);
+ }
+
+ /**
+ * batadv_meshif_destroy_netlink() - deletion of batadv_mesh_interface via
+ * netlink
+ * @mesh_iface: the to-be-removed batman-adv interface
+ * @head: list pointer
+ */
+ static void batadv_meshif_destroy_netlink(struct net_device *mesh_iface,
+ struct list_head *head)
+ {
+ struct batadv_priv *bat_priv = netdev_priv(mesh_iface);
+ struct batadv_hard_iface *hard_iface;
+ struct batadv_meshif_vlan *vlan;
+
+ list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
+ if (hard_iface->mesh_iface == mesh_iface)
+ batadv_hardif_disable_interface(hard_iface);
+ }
+
+ /* destroy the "untagged" VLAN */
+ vlan = batadv_meshif_vlan_get(bat_priv, BATADV_NO_FLAGS);
+ if (vlan) {
+ batadv_meshif_destroy_vlan(bat_priv, vlan);
+ batadv_meshif_vlan_put(vlan);
+ }
+
+ unregister_netdevice_queue(mesh_iface, head);
+ }
+
+ /**
+ * batadv_meshif_is_valid() - Check whether device is a batadv mesh interface
+ * @net_dev: device which should be checked
+ *
+ * Return: true when net_dev is a batman-adv interface, false otherwise
+ */
+ bool batadv_meshif_is_valid(const struct net_device *net_dev)
+ {
+ if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
+ return true;
+
+ return false;
+ }
+
+ static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = {
+ [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING },
+ };
+
+ struct rtnl_link_ops batadv_link_ops __read_mostly = {
+ .kind = "batadv",
+ .priv_size = sizeof(struct batadv_priv),
+ .setup = batadv_meshif_init_early,
+ .maxtype = IFLA_BATADV_MAX,
+ .policy = batadv_ifla_policy,
+ .validate = batadv_meshif_validate,
+ .newlink = batadv_meshif_newlink,
+ .dellink = batadv_meshif_destroy_netlink,
+ };
projects / linux-block.git / commitdiff