net/mac802154/monitor.c

   1 /*
   2  * Copyright 2007, 2008, 2009 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * Written by:
  14  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  15  * Sergey Lapin <slapin@ossfans.org>
  16  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/crc-ccitt.h>
  24
  25 #include <net/ieee802154.h>
  26 #include <net/mac802154.h>
  27 #include <net/netlink.h>
  28 #include <net/cfg802154.h>
  29 #include <linux/nl802154.h>
  30
  31 #include "ieee802154_i.h"
  32
  33 static netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb,
  34                                           struct net_device *dev)
  35 {
  36         struct mac802154_sub_if_data *priv;
  37         u8 chan, page;
  38
  39         priv = netdev_priv(dev);
  40
  41         /* FIXME: locking */
  42         chan = priv->hw->phy->current_channel;
  43         page = priv->hw->phy->current_page;
  44
  45         if (chan == MAC802154_CHAN_NONE) /* not initialized */
  46                 return NETDEV_TX_OK;
  47
  48         if (WARN_ON(page >= WPAN_NUM_PAGES) ||
  49             WARN_ON(chan >= WPAN_NUM_CHANNELS))
  50                 return NETDEV_TX_OK;
  51
  52         skb->skb_iif = dev->ifindex;
  53         dev->stats.tx_packets++;
  54         dev->stats.tx_bytes += skb->len;
  55
  56         return mac802154_tx(priv->hw, skb, page, chan);
  57 }
  58
  59
  60 void mac802154_monitors_rx(struct mac802154_priv *priv, struct sk_buff *skb)
  61 {
  62         struct sk_buff *skb2;
  63         struct mac802154_sub_if_data *sdata;
  64         u16 crc = crc_ccitt(0, skb->data, skb->len);
  65         u8 *data;
  66
  67         rcu_read_lock();
  68         list_for_each_entry_rcu(sdata, &priv->slaves, list) {
  69                 if (sdata->type != IEEE802154_DEV_MONITOR ||
  70                     !netif_running(sdata->dev))
  71                         continue;
  72
  73                 skb2 = skb_clone(skb, GFP_ATOMIC);
  74                 skb2->dev = sdata->dev;
  75                 skb2->pkt_type = PACKET_HOST;
  76                 data = skb_put(skb2, 2);
  77                 data[0] = crc & 0xff;
  78                 data[1] = crc >> 8;
  79
  80                 netif_rx_ni(skb2);
  81         }
  82         rcu_read_unlock();
  83 }
  84
  85 static const struct net_device_ops mac802154_monitor_ops = {
  86         .ndo_open               = mac802154_slave_open,
  87         .ndo_stop               = mac802154_slave_close,
  88         .ndo_start_xmit         = mac802154_monitor_xmit,
  89 };
  90
  91 void mac802154_monitor_setup(struct net_device *dev)
  92 {
  93         struct mac802154_sub_if_data *priv;
  94
  95         dev->addr_len           = 0;
  96         dev->hard_header_len    = 0;
  97         dev->needed_tailroom    = 2; /* room for FCS */
  98         dev->mtu                = IEEE802154_MTU;
  99         dev->tx_queue_len       = 10;
 100         dev->type               = ARPHRD_IEEE802154_MONITOR;
 101         dev->flags              = IFF_NOARP | IFF_BROADCAST;
 102         dev->watchdog_timeo     = 0;
 103
 104         dev->destructor         = free_netdev;
 105         dev->netdev_ops         = &mac802154_monitor_ops;
 106         dev->ml_priv            = &mac802154_mlme_reduced;
 107
 108         priv = netdev_priv(dev);
 109         priv->type = IEEE802154_DEV_MONITOR;
 110
 111         priv->chan = MAC802154_CHAN_NONE; /* not initialized */
 112         priv->page = 0;
 113 }