1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* Copyright 2007-2012 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Written by:
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Sergey Lapin <slapin@ossfans.org>
* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/crc-ccitt.h>
#include <net/rtnetlink.h>
#include <net/ieee802154_netdev.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
#include "ieee802154_i.h"
/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
* packets through the workqueue.
*/
struct wpan_xmit_cb {
struct sk_buff *skb;
struct work_struct work;
struct ieee802154_local *local;
};
static inline struct wpan_xmit_cb *wpan_xmit_cb(const struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct wpan_xmit_cb));
return (struct wpan_xmit_cb *)skb->cb;
}
static void mac802154_xmit_worker(struct work_struct *work)
{
struct wpan_xmit_cb *cb = container_of(work, struct wpan_xmit_cb, work);
struct ieee802154_local *local = cb->local;
struct sk_buff *skb = cb->skb;
int res;
rtnl_lock();
/* check if ifdown occurred while schedule */
if (!netif_running(skb->dev))
goto err_tx;
res = local->ops->xmit_sync(&local->hw, skb);
if (res)
goto err_tx;
ieee802154_xmit_complete(&local->hw, skb);
rtnl_unlock();
return;
err_tx:
/* Restart the netif queue on each sub_if_data object. */
ieee802154_wake_queue(&local->hw);
rtnl_unlock();
kfree_skb(skb);
netdev_dbg(skb->dev, "transmission failed\n");
}
static netdev_tx_t
mac802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
struct wpan_xmit_cb *cb = wpan_xmit_cb(skb);
int ret;
mac802154_monitors_rx(local, skb);
if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
u16 crc = crc_ccitt(0, skb->data, skb->len);
u8 *data = skb_put(skb, 2);
data[0] = crc & 0xff;
data[1] = crc >> 8;
}
if (skb_cow_head(skb, local->hw.extra_tx_headroom))
goto err_tx;
/* Stop the netif queue on each sub_if_data object. */
ieee802154_stop_queue(&local->hw);
/* async is priority, otherwise sync is fallback */
if (local->ops->xmit_async) {
ret = local->ops->xmit_async(&local->hw, skb);
if (ret) {
ieee802154_wake_queue(&local->hw);
goto err_tx;
}
} else {
INIT_WORK(&cb->work, mac802154_xmit_worker);
cb->skb = skb;
cb->local = local;
queue_work(local->workqueue, &cb->work);
}
return NETDEV_TX_OK;
err_tx:
kfree_skb(skb);
return NETDEV_TX_OK;
}
netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(sdata->local, skb);
}
netdev_tx_t mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
int rc;
rc = mac802154_llsec_encrypt(&sdata->sec, skb);
if (rc) {
netdev_warn(dev, "encryption failed: %i\n", rc);
kfree_skb(skb);
return NETDEV_TX_OK;
}
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(sdata->local, skb);
}
|
