0606069d9e
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>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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* Copyright 2007, 2008, 2009 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Sergey Lapin <slapin@ossfans.org>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/crc-ccitt.h>
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#include <net/ieee802154.h>
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#include <net/mac802154.h>
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#include <net/netlink.h>
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#include <net/wpan-phy.h>
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#include <linux/nl802154.h>
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#include "mac802154.h"
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static netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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u8 chan, page;
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priv = netdev_priv(dev);
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/* FIXME: locking */
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chan = priv->hw->phy->current_channel;
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page = priv->hw->phy->current_page;
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if (chan == MAC802154_CHAN_NONE) /* not initialized */
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return NETDEV_TX_OK;
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if (WARN_ON(page >= WPAN_NUM_PAGES) ||
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WARN_ON(chan >= WPAN_NUM_CHANNELS))
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return NETDEV_TX_OK;
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skb->skb_iif = dev->ifindex;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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return mac802154_tx(priv->hw, skb, page, chan);
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}
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void mac802154_monitors_rx(struct mac802154_priv *priv, struct sk_buff *skb)
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{
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struct sk_buff *skb2;
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struct mac802154_sub_if_data *sdata;
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u16 crc = crc_ccitt(0, skb->data, skb->len);
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u8 *data;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &priv->slaves, list) {
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if (sdata->type != IEEE802154_DEV_MONITOR)
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continue;
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skb2 = skb_clone(skb, GFP_ATOMIC);
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skb2->dev = sdata->dev;
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skb2->pkt_type = PACKET_HOST;
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data = skb_put(skb2, 2);
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data[0] = crc & 0xff;
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data[1] = crc >> 8;
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netif_rx_ni(skb2);
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}
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rcu_read_unlock();
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}
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static const struct net_device_ops mac802154_monitor_ops = {
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.ndo_open = mac802154_slave_open,
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.ndo_stop = mac802154_slave_close,
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.ndo_start_xmit = mac802154_monitor_xmit,
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};
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void mac802154_monitor_setup(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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dev->addr_len = 0;
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dev->hard_header_len = 0;
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dev->needed_tailroom = 2; /* room for FCS */
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dev->mtu = IEEE802154_MTU;
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dev->tx_queue_len = 10;
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dev->type = ARPHRD_IEEE802154_MONITOR;
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dev->flags = IFF_NOARP | IFF_BROADCAST;
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dev->watchdog_timeo = 0;
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dev->destructor = free_netdev;
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dev->netdev_ops = &mac802154_monitor_ops;
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dev->ml_priv = &mac802154_mlme_reduced;
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priv = netdev_priv(dev);
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priv->type = IEEE802154_DEV_MONITOR;
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priv->chan = MAC802154_CHAN_NONE; /* not initialized */
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priv->page = 0;
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}
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