rx.c (d5432503bfb49f3425bad0b850714ffd8b533cfc) rx.c (c5c47e67bcd24638a059b1b5e9ec18c95f8634ca)
1/*
2 * Copyright (C) 2007-2012 Siemens AG
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
1/*
2 * Copyright (C) 2007-2012 Siemens AG
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Written by:
18 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
19 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
20 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
21 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
13 * Written by:
14 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
15 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
16 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
26#include <linux/workqueue.h>
27#include <linux/netdevice.h>
28#include <linux/crc-ccitt.h>
29
30#include <net/mac802154.h>
31#include <net/ieee802154_netdev.h>
32
22#include <linux/netdevice.h>
23#include <linux/crc-ccitt.h>
24
25#include <net/mac802154.h>
26#include <net/ieee802154_netdev.h>
27
33#include "mac802154.h"
28#include "ieee802154_i.h"
34
29
35/* The IEEE 802.15.4 standard defines 4 MAC packet types:
36 * - beacon frame
37 * - MAC command frame
38 * - acknowledgement frame
39 * - data frame
40 *
41 * and only the data frame should be pushed to the upper layers, other types
42 * are just internal MAC layer management information. So only data packets
43 * are going to be sent to the networking queue, all other will be processed
44 * right here by using the device workqueue.
45 */
46struct rx_work {
47 struct sk_buff *skb;
48 struct work_struct work;
49 struct ieee802154_dev *dev;
50 u8 lqi;
51};
52
53static void
30static void
54mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi)
31mac802154_subif_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
55{
32{
56 struct mac802154_priv *priv = mac802154_to_priv(hw);
33 struct ieee802154_local *local = hw_to_local(hw);
57
34
58 mac_cb(skb)->lqi = lqi;
59 skb->protocol = htons(ETH_P_IEEE802154);
60 skb_reset_mac_header(skb);
61
35 skb->protocol = htons(ETH_P_IEEE802154);
36 skb_reset_mac_header(skb);
37
62 if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
38 if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
63 u16 crc;
64
65 if (skb->len < 2) {
66 pr_debug("got invalid frame\n");
67 goto fail;
68 }
69 crc = crc_ccitt(0, skb->data, skb->len);
70 if (crc) {
71 pr_debug("CRC mismatch\n");
72 goto fail;
73 }
74 skb_trim(skb, skb->len - 2); /* CRC */
75 }
76
39 u16 crc;
40
41 if (skb->len < 2) {
42 pr_debug("got invalid frame\n");
43 goto fail;
44 }
45 crc = crc_ccitt(0, skb->data, skb->len);
46 if (crc) {
47 pr_debug("CRC mismatch\n");
48 goto fail;
49 }
50 skb_trim(skb, skb->len - 2); /* CRC */
51 }
52
77 mac802154_monitors_rx(priv, skb);
78 mac802154_wpans_rx(priv, skb);
53 mac802154_monitors_rx(local, skb);
54 mac802154_wpans_rx(local, skb);
79
80 return;
81
82fail:
83 kfree_skb(skb);
84}
85
55
56 return;
57
58fail:
59 kfree_skb(skb);
60}
61
86static void mac802154_rx_worker(struct work_struct *work)
62void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
87{
63{
88 struct rx_work *rw = container_of(work, struct rx_work, work);
89
90 mac802154_subif_rx(rw->dev, rw->skb, rw->lqi);
91 kfree(rw);
64 mac802154_subif_rx(hw, skb);
92}
65}
66EXPORT_SYMBOL(ieee802154_rx);
93
94void
67
68void
95ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
69ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
96{
70{
97 struct mac802154_priv *priv = mac802154_to_priv(dev);
98 struct rx_work *work;
71 struct ieee802154_local *local = hw_to_local(hw);
99
72
100 if (!skb)
101 return;
102
103 work = kzalloc(sizeof(*work), GFP_ATOMIC);
104 if (!work)
105 return;
106
107 INIT_WORK(&work->work, mac802154_rx_worker);
108 work->skb = skb;
109 work->dev = dev;
110 work->lqi = lqi;
111
112 queue_work(priv->dev_workqueue, &work->work);
73 mac_cb(skb)->lqi = lqi;
74 skb->pkt_type = IEEE802154_RX_MSG;
75 skb_queue_tail(&local->skb_queue, skb);
76 tasklet_schedule(&local->tasklet);
113}
114EXPORT_SYMBOL(ieee802154_rx_irqsafe);
77}
78EXPORT_SYMBOL(ieee802154_rx_irqsafe);