summaryrefslogtreecommitdiff
path: root/net/mac802154/monitor.c
diff options
context:
space:
mode:
authoralex.bluesman.smirnov@gmail.com <alex.bluesman.smirnov@gmail.com>2012-05-15 20:50:29 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-16 15:17:08 -0400
commit0606069d9ef538687957d41ed6387d665af7a643 (patch)
treeb0e54cbdddc436a4b8fd48db676c0ab2efd55d6f /net/mac802154/monitor.c
parent62610ad21870a8cf842d4a48f07c3a964e1d2622 (diff)
mac802154: monitor device support
Support for monitor device intended to capture all the network activity. This interface could be used by networks sniffers and is already supported by WireShark. That's a good test point to check that basic MAC support works. Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mac802154/monitor.c')
-rw-r--r--net/mac802154/monitor.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/net/mac802154/monitor.c b/net/mac802154/monitor.c
new file mode 100644
index 000000000000..434a26f76a80
--- /dev/null
+++ b/net/mac802154/monitor.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2007, 2008, 2009 Siemens AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * 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.
+ *
+ * Written by:
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ * Sergey Lapin <slapin@ossfans.org>
+ * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
+ * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
+ */
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/crc-ccitt.h>
+
+#include <net/ieee802154.h>
+#include <net/mac802154.h>
+#include <net/netlink.h>
+#include <net/wpan-phy.h>
+#include <linux/nl802154.h>
+
+#include "mac802154.h"
+
+static netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct mac802154_sub_if_data *priv;
+ u8 chan, page;
+
+ priv = netdev_priv(dev);
+
+ /* FIXME: locking */
+ chan = priv->hw->phy->current_channel;
+ page = priv->hw->phy->current_page;
+
+ if (chan == MAC802154_CHAN_NONE) /* not initialized */
+ return NETDEV_TX_OK;
+
+ if (WARN_ON(page >= WPAN_NUM_PAGES) ||
+ WARN_ON(chan >= WPAN_NUM_CHANNELS))
+ return NETDEV_TX_OK;
+
+ skb->skb_iif = dev->ifindex;
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ return mac802154_tx(priv->hw, skb, page, chan);
+}
+
+
+void mac802154_monitors_rx(struct mac802154_priv *priv, struct sk_buff *skb)
+{
+ struct sk_buff *skb2;
+ struct mac802154_sub_if_data *sdata;
+ u16 crc = crc_ccitt(0, skb->data, skb->len);
+ u8 *data;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &priv->slaves, list) {
+ if (sdata->type != IEEE802154_DEV_MONITOR)
+ continue;
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ skb2->dev = sdata->dev;
+ skb2->pkt_type = PACKET_HOST;
+ data = skb_put(skb2, 2);
+ data[0] = crc & 0xff;
+ data[1] = crc >> 8;
+
+ netif_rx_ni(skb2);
+ }
+ rcu_read_unlock();
+}
+
+static const struct net_device_ops mac802154_monitor_ops = {
+ .ndo_open = mac802154_slave_open,
+ .ndo_stop = mac802154_slave_close,
+ .ndo_start_xmit = mac802154_monitor_xmit,
+};
+
+void mac802154_monitor_setup(struct net_device *dev)
+{
+ struct mac802154_sub_if_data *priv;
+
+ dev->addr_len = 0;
+ dev->hard_header_len = 0;
+ dev->needed_tailroom = 2; /* room for FCS */
+ dev->mtu = IEEE802154_MTU;
+ dev->tx_queue_len = 10;
+ dev->type = ARPHRD_IEEE802154_MONITOR;
+ dev->flags = IFF_NOARP | IFF_BROADCAST;
+ dev->watchdog_timeo = 0;
+
+ dev->destructor = free_netdev;
+ dev->netdev_ops = &mac802154_monitor_ops;
+ dev->ml_priv = &mac802154_mlme_reduced;
+
+ priv = netdev_priv(dev);
+ priv->type = IEEE802154_DEV_MONITOR;
+
+ priv->chan = MAC802154_CHAN_NONE; /* not initialized */
+ priv->page = 0;
+}