mirror of
https://github.com/torvalds/linux
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2d3b5b0a90
Only one WPAN devices can be active at any given time, so only deliver packets to that one interface that is actually up. Multiple monitors may be up at any given time, but we don't have to deliver to monitors that are down either. Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> 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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!netif_running(sdata->dev))
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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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