d58a2fa903
While doing a little test with the llsec implementation I saw these issues. We should move decryption and encruption somewhere else, otherwise while capturing with wireshark the mac header shows secuirty fields but the payload is plaintext. A complete other issue is what doing with HardMAC drivers where the payload is always plaintext. I think we need a special handling then in userspace. We currently doesn't support any HardMAC transceivers, so we should fix the first issue for SoftMAC transceivers. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
147 lines
3.6 KiB
C
147 lines
3.6 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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/* This check is for AF_PACKET RAW socket only, which doesn't
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* know about the FCS which is set here or by hardware. otherwise
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* it should not occur in any case!
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*
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* TODO: This should be handled in AF_PACKET and return -EMSGSIZE.
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*/
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if (skb->len > IEEE802154_MTU - IEEE802154_FCS_LEN) {
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netdev_warn(dev, "Frame len above MTU limit. Dropped.\n");
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goto err_tx;
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}
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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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/* 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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/* TODO we should move it to wpan_dev_hard_header and dev_hard_header
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* functions. The reason is wireshark will show a mac header which is
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* with security fields but the payload is not encrypted.
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*/
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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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