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https://github.com/torvalds/linux
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c22ff7b4e7
When transmitting a packet via a mac802154 driver that can sleep in its transmit function, mac802154 defers the call to the driver's transmit function to a per-device workqueue. However, mac802154 uses a single global work_struct for this, which means that if you have more than one registered mac802154 interface in the system, and you transmit on more than one of them at the same time, you'll very easily cause memory corruption. This patch moves the deferred transmit processing state from global variables to struct ieee802154_local, and this seems to fix the memory corruption issue. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Acked-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/*
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* Copyright 2007-2012 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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* 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/if_arp.h>
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#include <linux/crc-ccitt.h>
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#include <asm/unaligned.h>
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#include <net/rtnetlink.h>
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#include <net/ieee802154_netdev.h>
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#include <net/mac802154.h>
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#include <net/cfg802154.h>
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#include "ieee802154_i.h"
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#include "driver-ops.h"
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void ieee802154_xmit_worker(struct work_struct *work)
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{
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struct ieee802154_local *local =
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container_of(work, struct ieee802154_local, tx_work);
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struct sk_buff *skb = local->tx_skb;
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struct net_device *dev = skb->dev;
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int res;
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rtnl_lock();
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/* check if ifdown occurred while schedule */
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if (!netif_running(dev))
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goto err_tx;
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res = drv_xmit_sync(local, skb);
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if (res)
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goto err_tx;
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ieee802154_xmit_complete(&local->hw, skb, false);
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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rtnl_unlock();
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return;
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err_tx:
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/* Restart the netif queue on each sub_if_data object. */
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ieee802154_wake_queue(&local->hw);
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rtnl_unlock();
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kfree_skb(skb);
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netdev_dbg(dev, "transmission failed\n");
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}
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static netdev_tx_t
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ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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int ret;
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if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
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u16 crc = crc_ccitt(0, skb->data, skb->len);
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put_unaligned_le16(crc, skb_put(skb, 2));
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}
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if (skb_cow_head(skb, local->hw.extra_tx_headroom))
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goto err_tx;
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/* Stop the netif queue on each sub_if_data object. */
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ieee802154_stop_queue(&local->hw);
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/* async is priority, otherwise sync is fallback */
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if (local->ops->xmit_async) {
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ret = drv_xmit_async(local, skb);
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if (ret) {
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ieee802154_wake_queue(&local->hw);
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goto err_tx;
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}
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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} else {
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local->tx_skb = skb;
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queue_work(local->workqueue, &local->tx_work);
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}
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return NETDEV_TX_OK;
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err_tx:
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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netdev_tx_t
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ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
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skb->skb_iif = dev->ifindex;
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return ieee802154_tx(sdata->local, skb);
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}
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netdev_tx_t
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ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
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int rc;
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rc = mac802154_llsec_encrypt(&sdata->sec, skb);
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if (rc) {
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netdev_warn(dev, "encryption failed: %i\n", rc);
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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skb->skb_iif = dev->ifindex;
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return ieee802154_tx(sdata->local, skb);
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}
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