cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tx.c (3084B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2007-2012 Siemens AG
      4 *
      5 * Written by:
      6 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
      7 * Sergey Lapin <slapin@ossfans.org>
      8 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
      9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
     10 */
     11
     12#include <linux/netdevice.h>
     13#include <linux/if_arp.h>
     14#include <linux/crc-ccitt.h>
     15#include <asm/unaligned.h>
     16
     17#include <net/rtnetlink.h>
     18#include <net/ieee802154_netdev.h>
     19#include <net/mac802154.h>
     20#include <net/cfg802154.h>
     21
     22#include "ieee802154_i.h"
     23#include "driver-ops.h"
     24
     25void ieee802154_xmit_worker(struct work_struct *work)
     26{
     27	struct ieee802154_local *local =
     28		container_of(work, struct ieee802154_local, tx_work);
     29	struct sk_buff *skb = local->tx_skb;
     30	struct net_device *dev = skb->dev;
     31	int res;
     32
     33	res = drv_xmit_sync(local, skb);
     34	if (res)
     35		goto err_tx;
     36
     37	dev->stats.tx_packets++;
     38	dev->stats.tx_bytes += skb->len;
     39
     40	ieee802154_xmit_complete(&local->hw, skb, false);
     41
     42	return;
     43
     44err_tx:
     45	/* Restart the netif queue on each sub_if_data object. */
     46	ieee802154_wake_queue(&local->hw);
     47	kfree_skb(skb);
     48	netdev_dbg(dev, "transmission failed\n");
     49}
     50
     51static netdev_tx_t
     52ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
     53{
     54	struct net_device *dev = skb->dev;
     55	int ret;
     56
     57	if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
     58		struct sk_buff *nskb;
     59		u16 crc;
     60
     61		if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
     62			nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
     63					       GFP_ATOMIC);
     64			if (likely(nskb)) {
     65				consume_skb(skb);
     66				skb = nskb;
     67			} else {
     68				goto err_tx;
     69			}
     70		}
     71
     72		crc = crc_ccitt(0, skb->data, skb->len);
     73		put_unaligned_le16(crc, skb_put(skb, 2));
     74	}
     75
     76	/* Stop the netif queue on each sub_if_data object. */
     77	ieee802154_stop_queue(&local->hw);
     78
     79	/* async is priority, otherwise sync is fallback */
     80	if (local->ops->xmit_async) {
     81		unsigned int len = skb->len;
     82
     83		ret = drv_xmit_async(local, skb);
     84		if (ret) {
     85			ieee802154_wake_queue(&local->hw);
     86			goto err_tx;
     87		}
     88
     89		dev->stats.tx_packets++;
     90		dev->stats.tx_bytes += len;
     91	} else {
     92		local->tx_skb = skb;
     93		queue_work(local->workqueue, &local->tx_work);
     94	}
     95
     96	return NETDEV_TX_OK;
     97
     98err_tx:
     99	kfree_skb(skb);
    100	return NETDEV_TX_OK;
    101}
    102
    103netdev_tx_t
    104ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
    105{
    106	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
    107
    108	skb->skb_iif = dev->ifindex;
    109
    110	return ieee802154_tx(sdata->local, skb);
    111}
    112
    113netdev_tx_t
    114ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
    115{
    116	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
    117	int rc;
    118
    119	/* TODO we should move it to wpan_dev_hard_header and dev_hard_header
    120	 * functions. The reason is wireshark will show a mac header which is
    121	 * with security fields but the payload is not encrypted.
    122	 */
    123	rc = mac802154_llsec_encrypt(&sdata->sec, skb);
    124	if (rc) {
    125		netdev_warn(dev, "encryption failed: %i\n", rc);
    126		kfree_skb(skb);
    127		return NETDEV_TX_OK;
    128	}
    129
    130	skb->skb_iif = dev->ifindex;
    131
    132	return ieee802154_tx(sdata->local, skb);
    133}