1 /*
2 * Copyright 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 * Written by:
14 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
15 * Sergey Lapin <slapin@ossfans.org>
16 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
18 */
19
20 #include <linux/netdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/crc-ccitt.h>
23 #include <asm/unaligned.h>
24
25 #include <net/rtnetlink.h>
26 #include <net/ieee802154_netdev.h>
27 #include <net/mac802154.h>
28 #include <net/cfg802154.h>
29
30 #include "ieee802154_i.h"
31 #include "driver-ops.h"
32
ieee802154_xmit_worker(struct work_struct * work)33 void ieee802154_xmit_worker(struct work_struct *work)
34 {
35 struct ieee802154_local *local =
36 container_of(work, struct ieee802154_local, tx_work);
37 struct sk_buff *skb = local->tx_skb;
38 struct net_device *dev = skb->dev;
39 int res;
40
41 res = drv_xmit_sync(local, skb);
42 if (res)
43 goto err_tx;
44
45 dev->stats.tx_packets++;
46 dev->stats.tx_bytes += skb->len;
47
48 ieee802154_xmit_complete(&local->hw, skb, false);
49
50 return;
51
52 err_tx:
53 /* Restart the netif queue on each sub_if_data object. */
54 ieee802154_wake_queue(&local->hw);
55 kfree_skb(skb);
56 netdev_dbg(dev, "transmission failed\n");
57 }
58
59 static netdev_tx_t
ieee802154_tx(struct ieee802154_local * local,struct sk_buff * skb)60 ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
61 {
62 struct net_device *dev = skb->dev;
63 int ret;
64
65 if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
66 struct sk_buff *nskb;
67 u16 crc;
68
69 if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
70 nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
71 GFP_ATOMIC);
72 if (likely(nskb)) {
73 consume_skb(skb);
74 skb = nskb;
75 } else {
76 goto err_tx;
77 }
78 }
79
80 crc = crc_ccitt(0, skb->data, skb->len);
81 put_unaligned_le16(crc, skb_put(skb, 2));
82 }
83
84 /* Stop the netif queue on each sub_if_data object. */
85 ieee802154_stop_queue(&local->hw);
86
87 /* async is priority, otherwise sync is fallback */
88 if (local->ops->xmit_async) {
89 unsigned int len = skb->len;
90
91 ret = drv_xmit_async(local, skb);
92 if (ret) {
93 ieee802154_wake_queue(&local->hw);
94 goto err_tx;
95 }
96
97 dev->stats.tx_packets++;
98 dev->stats.tx_bytes += len;
99 } else {
100 local->tx_skb = skb;
101 queue_work(local->workqueue, &local->tx_work);
102 }
103
104 return NETDEV_TX_OK;
105
106 err_tx:
107 kfree_skb(skb);
108 return NETDEV_TX_OK;
109 }
110
111 netdev_tx_t
ieee802154_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)112 ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
113 {
114 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
115
116 skb->skb_iif = dev->ifindex;
117
118 return ieee802154_tx(sdata->local, skb);
119 }
120
121 netdev_tx_t
ieee802154_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)122 ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
123 {
124 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
125 int rc;
126
127 /* TODO we should move it to wpan_dev_hard_header and dev_hard_header
128 * functions. The reason is wireshark will show a mac header which is
129 * with security fields but the payload is not encrypted.
130 */
131 rc = mac802154_llsec_encrypt(&sdata->sec, skb);
132 if (rc) {
133 netdev_warn(dev, "encryption failed: %i\n", rc);
134 kfree_skb(skb);
135 return NETDEV_TX_OK;
136 }
137
138 skb->skb_iif = dev->ifindex;
139
140 return ieee802154_tx(sdata->local, skb);
141 }
142