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-rw-r--r--net/batman-adv/soft-interface.c942
1 files changed, 942 insertions, 0 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
new file mode 100644
index 00000000..a5590f41
--- /dev/null
+++ b/net/batman-adv/soft-interface.c
@@ -0,0 +1,942 @@
+/*
+ * Copyright (C) 2007-2012 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "routing.h"
+#include "send.h"
+#include "bat_debugfs.h"
+#include "translation-table.h"
+#include "hash.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "bat_sysfs.h"
+#include "originator.h"
+#include <linux/slab.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include "unicast.h"
+
+
+static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static void bat_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info);
+static u32 bat_get_msglevel(struct net_device *dev);
+static void bat_set_msglevel(struct net_device *dev, u32 value);
+static u32 bat_get_link(struct net_device *dev);
+
+static const struct ethtool_ops bat_ethtool_ops = {
+ .get_settings = bat_get_settings,
+ .get_drvinfo = bat_get_drvinfo,
+ .get_msglevel = bat_get_msglevel,
+ .set_msglevel = bat_set_msglevel,
+ .get_link = bat_get_link,
+};
+
+int my_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 void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
+{
+ if (atomic_dec_and_test(&softif_neigh->refcount))
+ kfree_rcu(softif_neigh, rcu);
+}
+
+static void softif_neigh_vid_free_rcu(struct rcu_head *rcu)
+{
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct softif_neigh *softif_neigh;
+ struct hlist_node *node, *node_tmp;
+ struct bat_priv *bat_priv;
+
+ softif_neigh_vid = container_of(rcu, struct softif_neigh_vid, rcu);
+ bat_priv = softif_neigh_vid->bat_priv;
+
+ spin_lock_bh(&bat_priv->softif_neigh_lock);
+ hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
+ &softif_neigh_vid->softif_neigh_list, list) {
+ hlist_del_rcu(&softif_neigh->list);
+ softif_neigh_free_ref(softif_neigh);
+ }
+ spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+ kfree(softif_neigh_vid);
+}
+
+static void softif_neigh_vid_free_ref(struct softif_neigh_vid *softif_neigh_vid)
+{
+ if (atomic_dec_and_test(&softif_neigh_vid->refcount))
+ call_rcu(&softif_neigh_vid->rcu, softif_neigh_vid_free_rcu);
+}
+
+static struct softif_neigh_vid *softif_neigh_vid_get(struct bat_priv *bat_priv,
+ short vid)
+{
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct hlist_node *node;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(softif_neigh_vid, node,
+ &bat_priv->softif_neigh_vids, list) {
+ if (softif_neigh_vid->vid != vid)
+ continue;
+
+ if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
+ continue;
+
+ goto out;
+ }
+
+ softif_neigh_vid = kzalloc(sizeof(*softif_neigh_vid), GFP_ATOMIC);
+ if (!softif_neigh_vid)
+ goto out;
+
+ softif_neigh_vid->vid = vid;
+ softif_neigh_vid->bat_priv = bat_priv;
+
+ /* initialize with 2 - caller decrements counter by one */
+ atomic_set(&softif_neigh_vid->refcount, 2);
+ INIT_HLIST_HEAD(&softif_neigh_vid->softif_neigh_list);
+ INIT_HLIST_NODE(&softif_neigh_vid->list);
+ spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
+ hlist_add_head_rcu(&softif_neigh_vid->list,
+ &bat_priv->softif_neigh_vids);
+ spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
+
+out:
+ rcu_read_unlock();
+ return softif_neigh_vid;
+}
+
+static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
+ const uint8_t *addr, short vid)
+{
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct softif_neigh *softif_neigh = NULL;
+ struct hlist_node *node;
+
+ softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
+ if (!softif_neigh_vid)
+ goto out;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(softif_neigh, node,
+ &softif_neigh_vid->softif_neigh_list,
+ list) {
+ if (!compare_eth(softif_neigh->addr, addr))
+ continue;
+
+ if (!atomic_inc_not_zero(&softif_neigh->refcount))
+ continue;
+
+ softif_neigh->last_seen = jiffies;
+ goto unlock;
+ }
+
+ softif_neigh = kzalloc(sizeof(*softif_neigh), GFP_ATOMIC);
+ if (!softif_neigh)
+ goto unlock;
+
+ memcpy(softif_neigh->addr, addr, ETH_ALEN);
+ softif_neigh->last_seen = jiffies;
+ /* initialize with 2 - caller decrements counter by one */
+ atomic_set(&softif_neigh->refcount, 2);
+
+ INIT_HLIST_NODE(&softif_neigh->list);
+ spin_lock_bh(&bat_priv->softif_neigh_lock);
+ hlist_add_head_rcu(&softif_neigh->list,
+ &softif_neigh_vid->softif_neigh_list);
+ spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+unlock:
+ rcu_read_unlock();
+out:
+ if (softif_neigh_vid)
+ softif_neigh_vid_free_ref(softif_neigh_vid);
+ return softif_neigh;
+}
+
+static struct softif_neigh *softif_neigh_get_selected(
+ struct softif_neigh_vid *softif_neigh_vid)
+{
+ struct softif_neigh *softif_neigh;
+
+ rcu_read_lock();
+ softif_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
+
+ if (softif_neigh && !atomic_inc_not_zero(&softif_neigh->refcount))
+ softif_neigh = NULL;
+
+ rcu_read_unlock();
+ return softif_neigh;
+}
+
+static struct softif_neigh *softif_neigh_vid_get_selected(
+ struct bat_priv *bat_priv,
+ short vid)
+{
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct softif_neigh *softif_neigh = NULL;
+
+ softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
+ if (!softif_neigh_vid)
+ goto out;
+
+ softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
+out:
+ if (softif_neigh_vid)
+ softif_neigh_vid_free_ref(softif_neigh_vid);
+ return softif_neigh;
+}
+
+static void softif_neigh_vid_select(struct bat_priv *bat_priv,
+ struct softif_neigh *new_neigh,
+ short vid)
+{
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct softif_neigh *curr_neigh;
+
+ softif_neigh_vid = softif_neigh_vid_get(bat_priv, vid);
+ if (!softif_neigh_vid)
+ goto out;
+
+ spin_lock_bh(&bat_priv->softif_neigh_lock);
+
+ if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
+ new_neigh = NULL;
+
+ curr_neigh = rcu_dereference_protected(softif_neigh_vid->softif_neigh,
+ 1);
+ rcu_assign_pointer(softif_neigh_vid->softif_neigh, new_neigh);
+
+ if ((curr_neigh) && (!new_neigh))
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Removing mesh exit point on vid: %d (prev: %pM).\n",
+ vid, curr_neigh->addr);
+ else if ((curr_neigh) && (new_neigh))
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Changing mesh exit point on vid: %d from %pM to %pM.\n",
+ vid, curr_neigh->addr, new_neigh->addr);
+ else if ((!curr_neigh) && (new_neigh))
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Setting mesh exit point on vid: %d to %pM.\n",
+ vid, new_neigh->addr);
+
+ if (curr_neigh)
+ softif_neigh_free_ref(curr_neigh);
+
+ spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+out:
+ if (softif_neigh_vid)
+ softif_neigh_vid_free_ref(softif_neigh_vid);
+}
+
+static void softif_neigh_vid_deselect(struct bat_priv *bat_priv,
+ struct softif_neigh_vid *softif_neigh_vid)
+{
+ struct softif_neigh *curr_neigh;
+ struct softif_neigh *softif_neigh = NULL, *softif_neigh_tmp;
+ struct hard_iface *primary_if = NULL;
+ struct hlist_node *node;
+
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto out;
+
+ /* find new softif_neigh immediately to avoid temporary loops */
+ rcu_read_lock();
+ curr_neigh = rcu_dereference(softif_neigh_vid->softif_neigh);
+
+ hlist_for_each_entry_rcu(softif_neigh_tmp, node,
+ &softif_neigh_vid->softif_neigh_list,
+ list) {
+ if (softif_neigh_tmp == curr_neigh)
+ continue;
+
+ /* we got a neighbor but its mac is 'bigger' than ours */
+ if (memcmp(primary_if->net_dev->dev_addr,
+ softif_neigh_tmp->addr, ETH_ALEN) < 0)
+ continue;
+
+ if (!atomic_inc_not_zero(&softif_neigh_tmp->refcount))
+ continue;
+
+ softif_neigh = softif_neigh_tmp;
+ goto unlock;
+ }
+
+unlock:
+ rcu_read_unlock();
+out:
+ softif_neigh_vid_select(bat_priv, softif_neigh, softif_neigh_vid->vid);
+
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ if (softif_neigh)
+ softif_neigh_free_ref(softif_neigh);
+}
+
+int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
+{
+ struct net_device *net_dev = (struct net_device *)seq->private;
+ struct bat_priv *bat_priv = netdev_priv(net_dev);
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct softif_neigh *softif_neigh;
+ struct hard_iface *primary_if;
+ struct hlist_node *node, *node_tmp;
+ struct softif_neigh *curr_softif_neigh;
+ int ret = 0, last_seen_secs, last_seen_msecs;
+
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if) {
+ ret = seq_printf(seq,
+ "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
+ net_dev->name);
+ goto out;
+ }
+
+ if (primary_if->if_status != IF_ACTIVE) {
+ ret = seq_printf(seq,
+ "BATMAN mesh %s disabled - primary interface not active\n",
+ net_dev->name);
+ goto out;
+ }
+
+ seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(softif_neigh_vid, node,
+ &bat_priv->softif_neigh_vids, list) {
+ seq_printf(seq, " %-15s %s on vid: %d\n",
+ "Originator", "last-seen", softif_neigh_vid->vid);
+
+ curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
+
+ hlist_for_each_entry_rcu(softif_neigh, node_tmp,
+ &softif_neigh_vid->softif_neigh_list,
+ list) {
+ last_seen_secs = jiffies_to_msecs(jiffies -
+ softif_neigh->last_seen) / 1000;
+ last_seen_msecs = jiffies_to_msecs(jiffies -
+ softif_neigh->last_seen) % 1000;
+ seq_printf(seq, "%s %pM %3i.%03is\n",
+ curr_softif_neigh == softif_neigh
+ ? "=>" : " ", softif_neigh->addr,
+ last_seen_secs, last_seen_msecs);
+ }
+
+ if (curr_softif_neigh)
+ softif_neigh_free_ref(curr_softif_neigh);
+
+ seq_printf(seq, "\n");
+ }
+ rcu_read_unlock();
+
+out:
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ return ret;
+}
+
+void softif_neigh_purge(struct bat_priv *bat_priv)
+{
+ struct softif_neigh *softif_neigh, *curr_softif_neigh;
+ struct softif_neigh_vid *softif_neigh_vid;
+ struct hlist_node *node, *node_tmp, *node_tmp2;
+ int do_deselect;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(softif_neigh_vid, node,
+ &bat_priv->softif_neigh_vids, list) {
+ if (!atomic_inc_not_zero(&softif_neigh_vid->refcount))
+ continue;
+
+ curr_softif_neigh = softif_neigh_get_selected(softif_neigh_vid);
+ do_deselect = 0;
+
+ spin_lock_bh(&bat_priv->softif_neigh_lock);
+ hlist_for_each_entry_safe(softif_neigh, node_tmp, node_tmp2,
+ &softif_neigh_vid->softif_neigh_list,
+ list) {
+ if ((!has_timed_out(softif_neigh->last_seen,
+ SOFTIF_NEIGH_TIMEOUT)) &&
+ (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
+ continue;
+
+ if (curr_softif_neigh == softif_neigh) {
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Current mesh exit point on vid: %d '%pM' vanished.\n",
+ softif_neigh_vid->vid,
+ softif_neigh->addr);
+ do_deselect = 1;
+ }
+
+ hlist_del_rcu(&softif_neigh->list);
+ softif_neigh_free_ref(softif_neigh);
+ }
+ spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+ /* soft_neigh_vid_deselect() needs to acquire the
+ * softif_neigh_lock */
+ if (do_deselect)
+ softif_neigh_vid_deselect(bat_priv, softif_neigh_vid);
+
+ if (curr_softif_neigh)
+ softif_neigh_free_ref(curr_softif_neigh);
+
+ softif_neigh_vid_free_ref(softif_neigh_vid);
+ }
+ rcu_read_unlock();
+
+ spin_lock_bh(&bat_priv->softif_neigh_vid_lock);
+ hlist_for_each_entry_safe(softif_neigh_vid, node, node_tmp,
+ &bat_priv->softif_neigh_vids, list) {
+ if (!hlist_empty(&softif_neigh_vid->softif_neigh_list))
+ continue;
+
+ hlist_del_rcu(&softif_neigh_vid->list);
+ softif_neigh_vid_free_ref(softif_neigh_vid);
+ }
+ spin_unlock_bh(&bat_priv->softif_neigh_vid_lock);
+
+}
+
+static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
+ short vid)
+{
+ struct bat_priv *bat_priv = netdev_priv(dev);
+ struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+ struct batman_ogm_packet *batman_ogm_packet;
+ struct softif_neigh *softif_neigh = NULL;
+ struct hard_iface *primary_if = NULL;
+ struct softif_neigh *curr_softif_neigh = NULL;
+
+ if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
+ batman_ogm_packet = (struct batman_ogm_packet *)
+ (skb->data + ETH_HLEN + VLAN_HLEN);
+ else
+ batman_ogm_packet = (struct batman_ogm_packet *)
+ (skb->data + ETH_HLEN);
+
+ if (batman_ogm_packet->header.version != COMPAT_VERSION)
+ goto out;
+
+ if (batman_ogm_packet->header.packet_type != BAT_OGM)
+ goto out;
+
+ if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
+ goto out;
+
+ if (is_my_mac(batman_ogm_packet->orig))
+ goto out;
+
+ softif_neigh = softif_neigh_get(bat_priv, batman_ogm_packet->orig, vid);
+ if (!softif_neigh)
+ goto out;
+
+ curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
+ if (curr_softif_neigh == softif_neigh)
+ goto out;
+
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto out;
+
+ /* we got a neighbor but its mac is 'bigger' than ours */
+ if (memcmp(primary_if->net_dev->dev_addr,
+ softif_neigh->addr, ETH_ALEN) < 0)
+ goto out;
+
+ /* close own batX device and use softif_neigh as exit node */
+ if (!curr_softif_neigh) {
+ softif_neigh_vid_select(bat_priv, softif_neigh, vid);
+ goto out;
+ }
+
+ /* switch to new 'smallest neighbor' */
+ if (memcmp(softif_neigh->addr, curr_softif_neigh->addr, ETH_ALEN) < 0)
+ softif_neigh_vid_select(bat_priv, softif_neigh, vid);
+
+out:
+ kfree_skb(skb);
+ if (softif_neigh)
+ softif_neigh_free_ref(softif_neigh);
+ if (curr_softif_neigh)
+ softif_neigh_free_ref(curr_softif_neigh);
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ return;
+}
+
+static int interface_open(struct net_device *dev)
+{
+ netif_start_queue(dev);
+ return 0;
+}
+
+static int interface_release(struct net_device *dev)
+{
+ netif_stop_queue(dev);
+ return 0;
+}
+
+static struct net_device_stats *interface_stats(struct net_device *dev)
+{
+ struct bat_priv *bat_priv = netdev_priv(dev);
+ return &bat_priv->stats;
+}
+
+static int interface_set_mac_addr(struct net_device *dev, void *p)
+{
+ struct bat_priv *bat_priv = netdev_priv(dev);
+ struct sockaddr *addr = p;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ /* only modify transtable if it has been initialized before */
+ if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
+ tt_local_remove(bat_priv, dev->dev_addr,
+ "mac address changed", false);
+ tt_local_add(dev, addr->sa_data, NULL_IFINDEX);
+ }
+
+ memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+ dev->addr_assign_type &= ~NET_ADDR_RANDOM;
+ return 0;
+}
+
+static int interface_change_mtu(struct net_device *dev, int new_mtu)
+{
+ /* check ranges */
+ if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
+static int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
+{
+ struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+ struct bat_priv *bat_priv = netdev_priv(soft_iface);
+ struct hard_iface *primary_if = NULL;
+ struct bcast_packet *bcast_packet;
+ struct vlan_ethhdr *vhdr;
+ struct softif_neigh *curr_softif_neigh = NULL;
+ unsigned int header_len = 0;
+ int data_len = skb->len, ret;
+ short vid = -1;
+ bool do_bcast = false;
+
+ if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+ goto dropped;
+
+ soft_iface->trans_start = jiffies;
+
+ switch (ntohs(ethhdr->h_proto)) {
+ case ETH_P_8021Q:
+ vhdr = (struct vlan_ethhdr *)skb->data;
+ vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+
+ if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+ break;
+
+ /* fall through */
+ case ETH_P_BATMAN:
+ softif_batman_recv(skb, soft_iface, vid);
+ goto end;
+ }
+
+ /**
+ * if we have a another chosen mesh exit node in range
+ * it will transport the packets to the mesh
+ */
+ curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
+ if (curr_softif_neigh)
+ goto dropped;
+
+ /* Register the client MAC in the transtable */
+ tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
+
+ if (is_multicast_ether_addr(ethhdr->h_dest)) {
+ do_bcast = true;
+
+ switch (atomic_read(&bat_priv->gw_mode)) {
+ case GW_MODE_SERVER:
+ /* gateway servers should not send dhcp
+ * requests into the mesh */
+ ret = gw_is_dhcp_target(skb, &header_len);
+ if (ret)
+ goto dropped;
+ break;
+ case GW_MODE_CLIENT:
+ /* gateway clients should send dhcp requests
+ * via unicast to their gateway */
+ ret = gw_is_dhcp_target(skb, &header_len);
+ if (ret)
+ do_bcast = false;
+ break;
+ case GW_MODE_OFF:
+ default:
+ break;
+ }
+ }
+
+ /* ethernet packet should be broadcasted */
+ if (do_bcast) {
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto dropped;
+
+ if (my_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
+ goto dropped;
+
+ bcast_packet = (struct bcast_packet *)skb->data;
+ bcast_packet->header.version = COMPAT_VERSION;
+ bcast_packet->header.ttl = TTL;
+
+ /* batman packet type: broadcast */
+ bcast_packet->header.packet_type = BAT_BCAST;
+
+ /* hw address of first interface is the orig mac because only
+ * this mac is known throughout the mesh */
+ memcpy(bcast_packet->orig,
+ primary_if->net_dev->dev_addr, ETH_ALEN);
+
+ /* set broadcast sequence number */
+ bcast_packet->seqno =
+ htonl(atomic_inc_return(&bat_priv->bcast_seqno));
+
+ add_bcast_packet_to_list(bat_priv, skb, 1);
+
+ /* a copy is stored in the bcast list, therefore removing
+ * the original skb. */
+ kfree_skb(skb);
+
+ /* unicast packet */
+ } else {
+ if (atomic_read(&bat_priv->gw_mode) != GW_MODE_OFF) {
+ ret = gw_out_of_range(bat_priv, skb, ethhdr);
+ if (ret)
+ goto dropped;
+ }
+
+ ret = unicast_send_skb(skb, bat_priv);
+ if (ret != 0)
+ goto dropped_freed;
+ }
+
+ bat_priv->stats.tx_packets++;
+ bat_priv->stats.tx_bytes += data_len;
+ goto end;
+
+dropped:
+ kfree_skb(skb);
+dropped_freed:
+ bat_priv->stats.tx_dropped++;
+end:
+ if (curr_softif_neigh)
+ softif_neigh_free_ref(curr_softif_neigh);
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ return NETDEV_TX_OK;
+}
+
+void interface_rx(struct net_device *soft_iface,
+ struct sk_buff *skb, struct hard_iface *recv_if,
+ int hdr_size)
+{
+ struct bat_priv *bat_priv = netdev_priv(soft_iface);
+ struct unicast_packet *unicast_packet;
+ struct ethhdr *ethhdr;
+ struct vlan_ethhdr *vhdr;
+ struct softif_neigh *curr_softif_neigh = NULL;
+ short vid = -1;
+ int ret;
+
+ /* 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);
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ switch (ntohs(ethhdr->h_proto)) {
+ case ETH_P_8021Q:
+ vhdr = (struct vlan_ethhdr *)skb->data;
+ vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+
+ if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
+ break;
+
+ /* fall through */
+ case ETH_P_BATMAN:
+ goto dropped;
+ }
+
+ /**
+ * if we have a another chosen mesh exit node in range
+ * it will transport the packets to the non-mesh network
+ */
+ curr_softif_neigh = softif_neigh_vid_get_selected(bat_priv, vid);
+ if (curr_softif_neigh) {
+ skb_push(skb, hdr_size);
+ unicast_packet = (struct unicast_packet *)skb->data;
+
+ if ((unicast_packet->header.packet_type != BAT_UNICAST) &&
+ (unicast_packet->header.packet_type != BAT_UNICAST_FRAG))
+ goto dropped;
+
+ skb_reset_mac_header(skb);
+
+ memcpy(unicast_packet->dest,
+ curr_softif_neigh->addr, ETH_ALEN);
+ ret = route_unicast_packet(skb, recv_if);
+ if (ret == NET_RX_DROP)
+ goto dropped;
+
+ goto out;
+ }
+
+ /* skb->dev & skb->pkt_type are set here */
+ if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+ goto dropped;
+ skb->protocol = eth_type_trans(skb, soft_iface);
+
+ /* should not be necessary anymore as we use skb_pull_rcsum()
+ * TODO: please verify this and remove this TODO
+ * -- Dec 21st 2009, Simon Wunderlich */
+
+/* skb->ip_summed = CHECKSUM_UNNECESSARY;*/
+
+ bat_priv->stats.rx_packets++;
+ bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);
+
+ soft_iface->last_rx = jiffies;
+
+ if (is_ap_isolated(bat_priv, ethhdr->h_source, ethhdr->h_dest))
+ goto dropped;
+
+ netif_rx(skb);
+ goto out;
+
+dropped:
+ kfree_skb(skb);
+out:
+ if (curr_softif_neigh)
+ softif_neigh_free_ref(curr_softif_neigh);
+ return;
+}
+
+static const struct net_device_ops bat_netdev_ops = {
+ .ndo_open = interface_open,
+ .ndo_stop = interface_release,
+ .ndo_get_stats = interface_stats,
+ .ndo_set_mac_address = interface_set_mac_addr,
+ .ndo_change_mtu = interface_change_mtu,
+ .ndo_start_xmit = interface_tx,
+ .ndo_validate_addr = eth_validate_addr
+};
+
+static void interface_setup(struct net_device *dev)
+{
+ struct bat_priv *priv = netdev_priv(dev);
+
+ ether_setup(dev);
+
+ dev->netdev_ops = &bat_netdev_ops;
+ dev->destructor = free_netdev;
+ dev->tx_queue_len = 0;
+
+ /**
+ * can't call min_mtu, because the needed variables
+ * have not been initialized yet
+ */
+ dev->mtu = ETH_DATA_LEN;
+ /* reserve more space in the skbuff for our header */
+ dev->hard_header_len = BAT_HEADER_LEN;
+
+ /* generate random address */
+ eth_hw_addr_random(dev);
+
+ SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
+
+ memset(priv, 0, sizeof(*priv));
+}
+
+struct net_device *softif_create(const char *name)
+{
+ struct net_device *soft_iface;
+ struct bat_priv *bat_priv;
+ int ret;
+
+ soft_iface = alloc_netdev(sizeof(*bat_priv), name, interface_setup);
+
+ if (!soft_iface)
+ goto out;
+
+ ret = register_netdevice(soft_iface);
+ if (ret < 0) {
+ pr_err("Unable to register the batman interface '%s': %i\n",
+ name, ret);
+ goto free_soft_iface;
+ }
+
+ bat_priv = netdev_priv(soft_iface);
+
+ atomic_set(&bat_priv->aggregated_ogms, 1);
+ atomic_set(&bat_priv->bonding, 0);
+ atomic_set(&bat_priv->ap_isolation, 0);
+ atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
+ atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
+ atomic_set(&bat_priv->gw_sel_class, 20);
+ atomic_set(&bat_priv->gw_bandwidth, 41);
+ atomic_set(&bat_priv->orig_interval, 1000);
+ atomic_set(&bat_priv->hop_penalty, 10);
+ atomic_set(&bat_priv->log_level, 0);
+ atomic_set(&bat_priv->fragmentation, 1);
+ atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
+ atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);
+
+ atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
+ atomic_set(&bat_priv->bcast_seqno, 1);
+ atomic_set(&bat_priv->ttvn, 0);
+ atomic_set(&bat_priv->tt_local_changes, 0);
+ atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
+
+ bat_priv->tt_buff = NULL;
+ bat_priv->tt_buff_len = 0;
+ bat_priv->tt_poss_change = false;
+
+ bat_priv->primary_if = NULL;
+ bat_priv->num_ifaces = 0;
+
+ ret = bat_algo_select(bat_priv, bat_routing_algo);
+ if (ret < 0)
+ goto unreg_soft_iface;
+
+ ret = sysfs_add_meshif(soft_iface);
+ if (ret < 0)
+ goto unreg_soft_iface;
+
+ ret = debugfs_add_meshif(soft_iface);
+ if (ret < 0)
+ goto unreg_sysfs;
+
+ ret = mesh_init(soft_iface);
+ if (ret < 0)
+ goto unreg_debugfs;
+
+ return soft_iface;
+
+unreg_debugfs:
+ debugfs_del_meshif(soft_iface);
+unreg_sysfs:
+ sysfs_del_meshif(soft_iface);
+unreg_soft_iface:
+ unregister_netdevice(soft_iface);
+ return NULL;
+
+free_soft_iface:
+ free_netdev(soft_iface);
+out:
+ return NULL;
+}
+
+void softif_destroy(struct net_device *soft_iface)
+{
+ debugfs_del_meshif(soft_iface);
+ sysfs_del_meshif(soft_iface);
+ mesh_free(soft_iface);
+ unregister_netdevice(soft_iface);
+}
+
+int softif_is_valid(const struct net_device *net_dev)
+{
+ if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
+ return 1;
+
+ return 0;
+}
+
+/* ethtool */
+static int bat_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 bat_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strcpy(info->driver, "B.A.T.M.A.N. advanced");
+ strcpy(info->version, SOURCE_VERSION);
+ strcpy(info->fw_version, "N/A");
+ strcpy(info->bus_info, "batman");
+}
+
+static u32 bat_get_msglevel(struct net_device *dev)
+{
+ return -EOPNOTSUPP;
+}
+
+static void bat_set_msglevel(struct net_device *dev, u32 value)
+{
+}
+
+static u32 bat_get_link(struct net_device *dev)
+{
+ return 1;
+}
generated by cgit (git 2.34.1) at 2024-12-20 11:41:14 +0000