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
ieee802154_xmit_worker(struct work_struct * work)25 void 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
44 err_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
51 static netdev_tx_t
ieee802154_tx(struct ieee802154_local * local,struct sk_buff * skb)52 ieee802154_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
98 err_tx:
99 kfree_skb(skb);
100 return NETDEV_TX_OK;
101 }
102
103 netdev_tx_t
ieee802154_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)104 ieee802154_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
113 netdev_tx_t
ieee802154_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)114 ieee802154_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 }
134