![Phoebe Buckheister](/assets/img/avatar_default.png)
All 802.15.4 PHY devices with drivers in tree can support only one WPAN at any given time, yet the stack allows arbitrarily many WPAN devices to be created and up at the same time. This cannot work with what the hardware provides, and in the current implementation, provides an easy DoS vector to any process on the system that may call socket() and sendmsg(). Thus, allow only one WPAN per PHY to be up at once, just like mac80211 does for managed devices. Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Signed-off-by: David S. Miller <davem@davemloft.net>
392 lines
8.9 KiB
C
392 lines
8.9 KiB
C
/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* Written by:
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*
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* Based on the code from 'linux-zigbee.sourceforge.net' project.
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/netlink.h>
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#include <linux/nl802154.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/route.h>
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#include <net/wpan-phy.h>
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#include "mac802154.h"
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int mac802154_slave_open(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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struct mac802154_sub_if_data *subif;
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struct mac802154_priv *ipriv = priv->hw;
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int res = 0;
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ASSERT_RTNL();
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if (priv->type == IEEE802154_DEV_WPAN) {
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mutex_lock(&priv->hw->slaves_mtx);
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list_for_each_entry(subif, &priv->hw->slaves, list) {
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if (subif != priv && subif->type == priv->type &&
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subif->running) {
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mutex_unlock(&priv->hw->slaves_mtx);
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return -EBUSY;
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}
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}
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mutex_unlock(&priv->hw->slaves_mtx);
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}
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mutex_lock(&priv->hw->slaves_mtx);
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priv->running = true;
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mutex_unlock(&priv->hw->slaves_mtx);
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if (ipriv->open_count++ == 0) {
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res = ipriv->ops->start(&ipriv->hw);
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WARN_ON(res);
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if (res)
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goto err;
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}
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if (ipriv->ops->ieee_addr) {
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__le64 addr = ieee802154_devaddr_from_raw(dev->dev_addr);
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res = ipriv->ops->ieee_addr(&ipriv->hw, addr);
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WARN_ON(res);
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if (res)
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goto err;
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mac802154_dev_set_ieee_addr(dev);
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}
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netif_start_queue(dev);
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return 0;
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err:
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priv->hw->open_count--;
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return res;
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}
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int mac802154_slave_close(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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struct mac802154_priv *ipriv = priv->hw;
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ASSERT_RTNL();
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netif_stop_queue(dev);
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mutex_lock(&priv->hw->slaves_mtx);
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priv->running = false;
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mutex_unlock(&priv->hw->slaves_mtx);
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if (!--ipriv->open_count)
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ipriv->ops->stop(&ipriv->hw);
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return 0;
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}
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static int
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mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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struct mac802154_priv *ipriv;
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int err;
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ipriv = wpan_phy_priv(phy);
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priv = netdev_priv(dev);
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priv->dev = dev;
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priv->hw = ipriv;
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dev->needed_headroom = ipriv->hw.extra_tx_headroom;
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SET_NETDEV_DEV(dev, &ipriv->phy->dev);
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mutex_lock(&ipriv->slaves_mtx);
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if (!ipriv->running) {
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mutex_unlock(&ipriv->slaves_mtx);
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return -ENODEV;
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}
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mutex_unlock(&ipriv->slaves_mtx);
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err = register_netdev(dev);
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if (err < 0)
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return err;
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rtnl_lock();
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mutex_lock(&ipriv->slaves_mtx);
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list_add_tail_rcu(&priv->list, &ipriv->slaves);
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mutex_unlock(&ipriv->slaves_mtx);
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rtnl_unlock();
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return 0;
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}
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static void
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mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
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{
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struct mac802154_sub_if_data *sdata;
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ASSERT_RTNL();
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sdata = netdev_priv(dev);
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BUG_ON(sdata->hw->phy != phy);
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mutex_lock(&sdata->hw->slaves_mtx);
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list_del_rcu(&sdata->list);
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mutex_unlock(&sdata->hw->slaves_mtx);
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synchronize_rcu();
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unregister_netdevice(sdata->dev);
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}
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static struct net_device *
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mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
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{
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struct net_device *dev;
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int err = -ENOMEM;
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switch (type) {
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case IEEE802154_DEV_MONITOR:
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dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
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name, mac802154_monitor_setup);
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break;
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case IEEE802154_DEV_WPAN:
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dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
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name, mac802154_wpan_setup);
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break;
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default:
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dev = NULL;
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err = -EINVAL;
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break;
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}
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if (!dev)
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goto err;
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err = mac802154_netdev_register(phy, dev);
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if (err)
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goto err_free;
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dev_hold(dev); /* we return an incremented device refcount */
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return dev;
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err_free:
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free_netdev(dev);
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err:
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return ERR_PTR(err);
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}
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static int mac802154_set_txpower(struct wpan_phy *phy, int db)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_txpower)
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return -ENOTSUPP;
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return priv->ops->set_txpower(&priv->hw, db);
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}
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static int mac802154_set_lbt(struct wpan_phy *phy, bool on)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_lbt)
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return -ENOTSUPP;
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return priv->ops->set_lbt(&priv->hw, on);
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}
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static int mac802154_set_cca_mode(struct wpan_phy *phy, u8 mode)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_cca_mode)
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return -ENOTSUPP;
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return priv->ops->set_cca_mode(&priv->hw, mode);
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}
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static int mac802154_set_cca_ed_level(struct wpan_phy *phy, s32 level)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_cca_ed_level)
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return -ENOTSUPP;
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return priv->ops->set_cca_ed_level(&priv->hw, level);
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}
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static int mac802154_set_csma_params(struct wpan_phy *phy, u8 min_be,
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u8 max_be, u8 retries)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_csma_params)
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return -ENOTSUPP;
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return priv->ops->set_csma_params(&priv->hw, min_be, max_be, retries);
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}
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static int mac802154_set_frame_retries(struct wpan_phy *phy, s8 retries)
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{
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struct mac802154_priv *priv = wpan_phy_priv(phy);
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if (!priv->ops->set_frame_retries)
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return -ENOTSUPP;
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return priv->ops->set_frame_retries(&priv->hw, retries);
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}
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struct ieee802154_dev *
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ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
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{
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struct wpan_phy *phy;
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struct mac802154_priv *priv;
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size_t priv_size;
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if (!ops || !ops->xmit || !ops->ed || !ops->start ||
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!ops->stop || !ops->set_channel) {
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pr_err("undefined IEEE802.15.4 device operations\n");
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return NULL;
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}
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/* Ensure 32-byte alignment of our private data and hw private data.
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* We use the wpan_phy priv data for both our mac802154_priv and for
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* the driver's private data
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*
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* in memory it'll be like this:
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*
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* +-----------------------+
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* | struct wpan_phy |
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* +-----------------------+
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* | struct mac802154_priv |
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* +-----------------------+
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* | driver's private data |
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* +-----------------------+
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*
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* Due to ieee802154 layer isn't aware of driver and MAC structures,
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* so lets allign them here.
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*/
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priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
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phy = wpan_phy_alloc(priv_size);
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if (!phy) {
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pr_err("failure to allocate master IEEE802.15.4 device\n");
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return NULL;
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}
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priv = wpan_phy_priv(phy);
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priv->hw.phy = priv->phy = phy;
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priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
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priv->ops = ops;
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INIT_LIST_HEAD(&priv->slaves);
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mutex_init(&priv->slaves_mtx);
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return &priv->hw;
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}
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EXPORT_SYMBOL(ieee802154_alloc_device);
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void ieee802154_free_device(struct ieee802154_dev *hw)
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{
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struct mac802154_priv *priv = mac802154_to_priv(hw);
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BUG_ON(!list_empty(&priv->slaves));
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mutex_destroy(&priv->slaves_mtx);
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wpan_phy_free(priv->phy);
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}
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EXPORT_SYMBOL(ieee802154_free_device);
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int ieee802154_register_device(struct ieee802154_dev *dev)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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int rc = -ENOMEM;
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priv->dev_workqueue =
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create_singlethread_workqueue(wpan_phy_name(priv->phy));
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if (!priv->dev_workqueue)
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goto out;
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wpan_phy_set_dev(priv->phy, priv->hw.parent);
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priv->phy->add_iface = mac802154_add_iface;
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priv->phy->del_iface = mac802154_del_iface;
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priv->phy->set_txpower = mac802154_set_txpower;
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priv->phy->set_lbt = mac802154_set_lbt;
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priv->phy->set_cca_mode = mac802154_set_cca_mode;
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priv->phy->set_cca_ed_level = mac802154_set_cca_ed_level;
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priv->phy->set_csma_params = mac802154_set_csma_params;
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priv->phy->set_frame_retries = mac802154_set_frame_retries;
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rc = wpan_phy_register(priv->phy);
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if (rc < 0)
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goto out_wq;
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rtnl_lock();
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mutex_lock(&priv->slaves_mtx);
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priv->running = MAC802154_DEVICE_RUN;
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mutex_unlock(&priv->slaves_mtx);
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rtnl_unlock();
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return 0;
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out_wq:
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destroy_workqueue(priv->dev_workqueue);
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out:
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return rc;
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}
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EXPORT_SYMBOL(ieee802154_register_device);
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void ieee802154_unregister_device(struct ieee802154_dev *dev)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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struct mac802154_sub_if_data *sdata, *next;
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flush_workqueue(priv->dev_workqueue);
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destroy_workqueue(priv->dev_workqueue);
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rtnl_lock();
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mutex_lock(&priv->slaves_mtx);
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priv->running = MAC802154_DEVICE_STOPPED;
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mutex_unlock(&priv->slaves_mtx);
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list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
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mutex_lock(&sdata->hw->slaves_mtx);
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list_del(&sdata->list);
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mutex_unlock(&sdata->hw->slaves_mtx);
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unregister_netdevice(sdata->dev);
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}
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rtnl_unlock();
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wpan_phy_unregister(priv->phy);
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}
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EXPORT_SYMBOL(ieee802154_unregister_device);
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MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
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MODULE_LICENSE("GPL v2");
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