linux-sg2042/net/batman-adv/soft-interface.c

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24 KiB
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/*
* Copyright (C) 2007-2011 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 ((!time_after(jiffies, softif_neigh->last_seen +
msecs_to_jiffies(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->version != COMPAT_VERSION)
goto out;
if (batman_ogm_packet->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);
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;
struct orig_node *orig_node = NULL;
int data_len = skb->len, ret;
short vid = -1;
bool do_bcast;
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;
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 20:27:44 +08:00
/* Register the client MAC in the transtable */
tt_local_add(soft_iface, ethhdr->h_source, skb->skb_iif);
orig_node = transtable_search(bat_priv, ethhdr->h_source,
ethhdr->h_dest);
do_bcast = is_multicast_ether_addr(ethhdr->h_dest);
if (do_bcast || (orig_node && orig_node->gw_flags)) {
ret = gw_is_target(bat_priv, skb, orig_node);
if (ret < 0)
goto dropped;
if (ret)
do_bcast = false;
}
/* 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->version = COMPAT_VERSION;
bcast_packet->ttl = TTL;
/* batman packet type: broadcast */
bcast_packet->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 {
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);
if (orig_node)
orig_node_free_ref(orig_node);
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->packet_type != BAT_UNICAST) &&
(unicast_packet->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);
char dev_addr[ETH_ALEN];
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 */
random_ether_addr(dev_addr);
memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
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);
batman-adv: improved client announcement mechanism The client announcement mechanism informs every mesh node in the network of any connected non-mesh client, in order to find the path towards that client from any given point in the mesh. The old implementation was based on the simple idea of appending a data buffer to each OGM containing all the client MAC addresses the node is serving. All other nodes can populate their global translation tables (table which links client MAC addresses to node addresses) using this MAC address buffer and linking it to the node's address contained in the OGM. A node that wants to contact a client has to lookup the node the client is connected to and its address in the global translation table. It is easy to understand that this implementation suffers from several issues: - big overhead (each and every OGM contains the entire list of connected clients) - high latencies for client route updates due to long OGM trip time and OGM losses The new implementation addresses these issues by appending client changes (new client joined or a client left) to the OGM instead of filling it with all the client addresses each time. In this way nodes can modify their global tables by means of "updates", thus reducing the overhead within the OGMs. To keep the entire network in sync each node maintains a translation table version number (ttvn) and a translation table checksum. These values are spread with the OGM to allow all the network participants to determine whether or not they need to update their translation table information. When a translation table lookup is performed in order to send a packet to a client attached to another node, the destination's ttvn is added to the payload packet. Forwarding nodes can compare the packet's ttvn with their destination's ttvn (this node could have a fresher information than the source) and re-route the packet if necessary. This greatly reduces the packet loss of clients roaming from one AP to the next. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-27 20:27:44 +08:00
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 = 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_netdev(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;
}