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26#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/fcntl.h>
32#include <linux/interrupt.h>
33#include <linux/ptrace.h>
34#include <linux/poll.h>
35
36#include <linux/slab.h>
37#include <linux/tty.h>
38#include <linux/errno.h>
39#include <linux/string.h>
40#include <linux/signal.h>
41#include <linux/ioctl.h>
42#include <linux/skbuff.h>
43#include <asm/unaligned.h>
44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
48#include "hci_uart.h"
49
50struct h4_struct {
51 struct sk_buff *rx_skb;
52 struct sk_buff_head txq;
53};
54
55
56static int h4_open(struct hci_uart *hu)
57{
58 struct h4_struct *h4;
59
60 BT_DBG("hu %p", hu);
61
62 h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
63 if (!h4)
64 return -ENOMEM;
65
66 skb_queue_head_init(&h4->txq);
67
68 hu->priv = h4;
69 return 0;
70}
71
72
73static int h4_flush(struct hci_uart *hu)
74{
75 struct h4_struct *h4 = hu->priv;
76
77 BT_DBG("hu %p", hu);
78
79 skb_queue_purge(&h4->txq);
80
81 return 0;
82}
83
84
85static int h4_close(struct hci_uart *hu)
86{
87 struct h4_struct *h4 = hu->priv;
88
89 hu->priv = NULL;
90
91 BT_DBG("hu %p", hu);
92
93 skb_queue_purge(&h4->txq);
94
95 kfree_skb(h4->rx_skb);
96
97 hu->priv = NULL;
98 kfree(h4);
99
100 return 0;
101}
102
103
104static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
105{
106 struct h4_struct *h4 = hu->priv;
107
108 BT_DBG("hu %p skb %p", hu, skb);
109
110
111 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
112 skb_queue_tail(&h4->txq, skb);
113
114 return 0;
115}
116
117static const struct h4_recv_pkt h4_recv_pkts[] = {
118 { H4_RECV_ACL, .recv = hci_recv_frame },
119 { H4_RECV_SCO, .recv = hci_recv_frame },
120 { H4_RECV_EVENT, .recv = hci_recv_frame },
121};
122
123
124static int h4_recv(struct hci_uart *hu, const void *data, int count)
125{
126 struct h4_struct *h4 = hu->priv;
127
128 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
129 return -EUNATCH;
130
131 h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count,
132 h4_recv_pkts, ARRAY_SIZE(h4_recv_pkts));
133 if (IS_ERR(h4->rx_skb)) {
134 int err = PTR_ERR(h4->rx_skb);
135 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
136 h4->rx_skb = NULL;
137 return err;
138 }
139
140 return count;
141}
142
143static struct sk_buff *h4_dequeue(struct hci_uart *hu)
144{
145 struct h4_struct *h4 = hu->priv;
146 return skb_dequeue(&h4->txq);
147}
148
149static const struct hci_uart_proto h4p = {
150 .id = HCI_UART_H4,
151 .name = "H4",
152 .open = h4_open,
153 .close = h4_close,
154 .recv = h4_recv,
155 .enqueue = h4_enqueue,
156 .dequeue = h4_dequeue,
157 .flush = h4_flush,
158};
159
160int __init h4_init(void)
161{
162 return hci_uart_register_proto(&h4p);
163}
164
165int __exit h4_deinit(void)
166{
167 return hci_uart_unregister_proto(&h4p);
168}
169
170struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
171 const unsigned char *buffer, int count,
172 const struct h4_recv_pkt *pkts, int pkts_count)
173{
174 struct hci_uart *hu = hci_get_drvdata(hdev);
175 u8 alignment = hu->alignment;
176
177 while (count) {
178 int i, len;
179
180
181 for (; hu->padding && count > 0; hu->padding--) {
182 count--;
183 buffer++;
184 }
185 if (!count)
186 break;
187
188 if (!skb) {
189 for (i = 0; i < pkts_count; i++) {
190 if (buffer[0] != (&pkts[i])->type)
191 continue;
192
193 skb = bt_skb_alloc((&pkts[i])->maxlen,
194 GFP_ATOMIC);
195 if (!skb)
196 return ERR_PTR(-ENOMEM);
197
198 hci_skb_pkt_type(skb) = (&pkts[i])->type;
199 hci_skb_expect(skb) = (&pkts[i])->hlen;
200 break;
201 }
202
203
204 if (!skb)
205 return ERR_PTR(-EILSEQ);
206
207 count -= 1;
208 buffer += 1;
209 }
210
211 len = min_t(uint, hci_skb_expect(skb) - skb->len, count);
212 memcpy(skb_put(skb, len), buffer, len);
213
214 count -= len;
215 buffer += len;
216
217
218 if (skb->len < hci_skb_expect(skb))
219 continue;
220
221 for (i = 0; i < pkts_count; i++) {
222 if (hci_skb_pkt_type(skb) == (&pkts[i])->type)
223 break;
224 }
225
226 if (i >= pkts_count) {
227 kfree_skb(skb);
228 return ERR_PTR(-EILSEQ);
229 }
230
231 if (skb->len == (&pkts[i])->hlen) {
232 u16 dlen;
233
234 switch ((&pkts[i])->lsize) {
235 case 0:
236
237 dlen = 0;
238 break;
239 case 1:
240
241 dlen = skb->data[(&pkts[i])->loff];
242 hci_skb_expect(skb) += dlen;
243
244 if (skb_tailroom(skb) < dlen) {
245 kfree_skb(skb);
246 return ERR_PTR(-EMSGSIZE);
247 }
248 break;
249 case 2:
250
251 dlen = get_unaligned_le16(skb->data +
252 (&pkts[i])->loff);
253 hci_skb_expect(skb) += dlen;
254
255 if (skb_tailroom(skb) < dlen) {
256 kfree_skb(skb);
257 return ERR_PTR(-EMSGSIZE);
258 }
259 break;
260 default:
261
262 kfree_skb(skb);
263 return ERR_PTR(-EILSEQ);
264 }
265
266 if (!dlen) {
267 hu->padding = (skb->len - 1) % alignment;
268 hu->padding = (alignment - hu->padding) % alignment;
269
270
271 (&pkts[i])->recv(hdev, skb);
272 skb = NULL;
273 }
274 } else {
275 hu->padding = (skb->len - 1) % alignment;
276 hu->padding = (alignment - hu->padding) % alignment;
277
278
279 (&pkts[i])->recv(hdev, skb);
280 skb = NULL;
281 }
282 }
283
284 return skb;
285}
286EXPORT_SYMBOL_GPL(h4_recv_buf);
287
