mirror of
https://github.com/torvalds/linux
synced 2024-09-20 11:07:02 +00:00
32edc40ae6
The current mac_cb handling of ieee802154 is rather awkward and limited. Decompose the single flags field into multiple fields with the meanings of each subfield of the flags field to make future extensions (for example, link-layer security) easier. Also don't set the frame sequence number in upper layers, since that's a thing the MAC is supposed to set on frame transmit - we set it on header creation, but assuming that upper layers do not blindly duplicate our headers, this is fine. Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Signed-off-by: David S. Miller <davem@davemloft.net>
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
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* Copyright (C) 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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* 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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* Written by:
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* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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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/workqueue.h>
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#include <linux/netdevice.h>
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#include <linux/crc-ccitt.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include "mac802154.h"
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/* The IEEE 802.15.4 standard defines 4 MAC packet types:
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* - beacon frame
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* - MAC command frame
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* - acknowledgement frame
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* - data frame
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*
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* and only the data frame should be pushed to the upper layers, other types
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* are just internal MAC layer management information. So only data packets
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* are going to be sent to the networking queue, all other will be processed
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* right here by using the device workqueue.
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*/
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struct rx_work {
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struct sk_buff *skb;
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struct work_struct work;
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struct ieee802154_dev *dev;
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u8 lqi;
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};
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static void
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mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi)
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{
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struct mac802154_priv *priv = mac802154_to_priv(hw);
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mac_cb(skb)->lqi = lqi;
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skb->protocol = htons(ETH_P_IEEE802154);
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skb_reset_mac_header(skb);
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if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
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u16 crc;
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if (skb->len < 2) {
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pr_debug("got invalid frame\n");
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goto out;
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}
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crc = crc_ccitt(0, skb->data, skb->len);
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if (crc) {
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pr_debug("CRC mismatch\n");
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goto out;
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}
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skb_trim(skb, skb->len - 2); /* CRC */
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}
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mac802154_monitors_rx(priv, skb);
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mac802154_wpans_rx(priv, skb);
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out:
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dev_kfree_skb(skb);
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}
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static void mac802154_rx_worker(struct work_struct *work)
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{
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struct rx_work *rw = container_of(work, struct rx_work, work);
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struct sk_buff *skb = rw->skb;
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mac802154_subif_rx(rw->dev, skb, rw->lqi);
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kfree(rw);
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}
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void
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ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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struct rx_work *work;
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if (!skb)
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return;
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work = kzalloc(sizeof(struct rx_work), GFP_ATOMIC);
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if (!work)
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return;
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INIT_WORK(&work->work, mac802154_rx_worker);
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work->skb = skb;
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work->dev = dev;
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work->lqi = lqi;
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queue_work(priv->dev_workqueue, &work->work);
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}
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EXPORT_SYMBOL(ieee802154_rx_irqsafe);
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