From 0606069d9ef538687957d41ed6387d665af7a643 Mon Sep 17 00:00:00 2001 From: "alex.bluesman.smirnov@gmail.com" Date: Tue, 15 May 2012 20:50:29 +0000 Subject: 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 Signed-off-by: David S. Miller --- net/mac802154/Makefile | 2 +- net/mac802154/ieee802154_dev.c | 5 +- net/mac802154/mac802154.h | 5 ++ net/mac802154/monitor.c | 116 +++++++++++++++++++++++++++++++++++++++++ net/mac802154/rx.c | 1 + 5 files changed, 127 insertions(+), 2 deletions(-) create mode 100644 net/mac802154/monitor.c (limited to 'net/mac802154') diff --git a/net/mac802154/Makefile b/net/mac802154/Makefile index 6b348b07a76..ec1bd3fc127 100644 --- a/net/mac802154/Makefile +++ b/net/mac802154/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_MAC802154) += mac802154.o -mac802154-objs := ieee802154_dev.o rx.o tx.o mac_cmd.o mib.o +mac802154-objs := ieee802154_dev.o rx.o tx.o mac_cmd.o mib.o monitor.o diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c index 9f36760b6c3..e3edfb0661b 100644 --- a/net/mac802154/ieee802154_dev.c +++ b/net/mac802154/ieee802154_dev.c @@ -135,8 +135,11 @@ mac802154_add_iface(struct wpan_phy *phy, const char *name, int type) struct net_device *dev; int err = -ENOMEM; - /* No devices is currently added */ switch (type) { + case IEEE802154_DEV_MONITOR: + dev = alloc_netdev(sizeof(struct mac802154_sub_if_data), + name, mac802154_monitor_setup); + break; default: dev = NULL; err = -EINVAL; diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h index 622752622c8..789d9c948ae 100644 --- a/net/mac802154/mac802154.h +++ b/net/mac802154/mac802154.h @@ -90,11 +90,16 @@ struct mac802154_sub_if_data { #define MAC802154_MAX_XMIT_ATTEMPTS 3 +#define MAC802154_CHAN_NONE (~(u8)0) /* No channel is assigned */ + extern struct ieee802154_reduced_mlme_ops mac802154_mlme_reduced; int mac802154_slave_open(struct net_device *dev); int mac802154_slave_close(struct net_device *dev); +void mac802154_monitors_rx(struct mac802154_priv *priv, struct sk_buff *skb); +void mac802154_monitor_setup(struct net_device *dev); + netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, u8 page, u8 chan); diff --git a/net/mac802154/monitor.c b/net/mac802154/monitor.c new file mode 100644 index 00000000000..434a26f76a8 --- /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 + * Sergey Lapin + * Maxim Gorbachyov + * Alexander Smirnov + */ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#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; +} diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c index d15738fae55..4a7d76d4f8b 100644 --- a/net/mac802154/rx.c +++ b/net/mac802154/rx.c @@ -76,6 +76,7 @@ mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi) skb_trim(skb, skb->len - 2); /* CRC */ } + mac802154_monitors_rx(priv, skb); out: dev_kfree_skb(skb); return; -- cgit v1.2.3