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253 lines · 5.9 KiB

1// SPDX-License-Identifier: GPL-2.0
2
3/* Copyright (C) 2021 Intel Corporation */
4
5#include <net/bluetooth/bluetooth.h>
6#include <net/bluetooth/hci_core.h>
7#include "hci_codec.h"
8
9static int hci_codec_list_add(struct list_head *list,
10 struct hci_op_read_local_codec_caps *sent,
11 struct hci_rp_read_local_codec_caps *rp,
12 void *caps,
13 __u32 len)
14{
15 struct codec_list *entry;
16
17 entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL);
18 if (!entry)
19 return -ENOMEM;
20
21 entry->id = sent->id;
22 if (sent->id == 0xFF) {
23 entry->cid = __le16_to_cpu(sent->cid);
24 entry->vid = __le16_to_cpu(sent->vid);
25 }
26 entry->transport = sent->transport;
27 entry->len = len;
28 entry->num_caps = 0;
29 if (rp) {
30 entry->num_caps = rp->num_caps;
31 memcpy(entry->caps, caps, len);
32 }
33 list_add(&entry->list, list);
34
35 return 0;
36}
37
38void hci_codec_list_clear(struct list_head *codec_list)
39{
40 struct codec_list *c, *n;
41
42 list_for_each_entry_safe(c, n, codec_list, list) {
43 list_del(&c->list);
44 kfree(c);
45 }
46}
47
48static void hci_read_codec_capabilities(struct hci_dev *hdev, __u8 transport,
49 struct hci_op_read_local_codec_caps
50 *cmd)
51{
52 __u8 i;
53
54 for (i = 0; i < TRANSPORT_TYPE_MAX; i++) {
55 if (transport & BIT(i)) {
56 struct hci_rp_read_local_codec_caps *rp;
57 struct hci_codec_caps *caps;
58 struct sk_buff *skb;
59 __u8 j;
60 __u32 len;
61
62 cmd->transport = i;
63
64 /* If Read_Codec_Capabilities command is not supported
65 * then just add codec to the list without caps
66 */
67 if (!(hdev->commands[45] & 0x08)) {
68 hci_dev_lock(hdev);
69 hci_codec_list_add(&hdev->local_codecs, cmd,
70 NULL, NULL, 0);
71 hci_dev_unlock(hdev);
72 continue;
73 }
74
75 skb = __hci_cmd_sync_sk(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
76 sizeof(*cmd), cmd, 0, HCI_CMD_TIMEOUT, NULL);
77 if (IS_ERR(skb)) {
78 bt_dev_err(hdev, "Failed to read codec capabilities (%ld)",
79 PTR_ERR(skb));
80 continue;
81 }
82
83 if (skb->len < sizeof(*rp))
84 goto error;
85
86 rp = (void *)skb->data;
87
88 if (rp->status)
89 goto error;
90
91 if (!rp->num_caps) {
92 len = 0;
93 /* this codec doesn't have capabilities */
94 goto skip_caps_parse;
95 }
96
97 skb_pull(skb, sizeof(*rp));
98
99 for (j = 0, len = 0; j < rp->num_caps; j++) {
100 caps = (void *)skb->data;
101 if (skb->len < sizeof(*caps))
102 goto error;
103 if (skb->len < sizeof(caps->len) + caps->len)
104 goto error;
105 len += sizeof(caps->len) + caps->len;
106 skb_pull(skb, sizeof(caps->len) + caps->len);
107 }
108
109skip_caps_parse:
110 hci_dev_lock(hdev);
111 hci_codec_list_add(&hdev->local_codecs, cmd, rp,
112 (__u8 *)rp + sizeof(*rp), len);
113 hci_dev_unlock(hdev);
114error:
115 kfree_skb(skb);
116 }
117 }
118}
119
120void hci_read_supported_codecs(struct hci_dev *hdev)
121{
122 struct sk_buff *skb;
123 struct hci_rp_read_local_supported_codecs *rp;
124 struct hci_std_codecs *std_codecs;
125 struct hci_vnd_codecs *vnd_codecs;
126 struct hci_op_read_local_codec_caps caps;
127 __u8 i;
128
129 skb = __hci_cmd_sync_sk(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL,
130 0, HCI_CMD_TIMEOUT, NULL);
131
132 if (IS_ERR(skb)) {
133 bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
134 PTR_ERR(skb));
135 return;
136 }
137
138 if (skb->len < sizeof(*rp))
139 goto error;
140
141 rp = (void *)skb->data;
142
143 if (rp->status)
144 goto error;
145
146 skb_pull(skb, sizeof(rp->status));
147
148 std_codecs = skb_pull_data(skb, sizeof(*std_codecs));
149 if (!std_codecs)
150 goto error;
151
152 /* validate codecs length before accessing */
153 if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num))
154 goto error;
155
156 /* enumerate codec capabilities of standard codecs */
157 memset(&caps, 0, sizeof(caps));
158 for (i = 0; i < std_codecs->num; i++) {
159 caps.id = std_codecs->codec[i];
160 caps.direction = 0x00;
161 hci_read_codec_capabilities(hdev,
162 LOCAL_CODEC_ACL_MASK | LOCAL_CODEC_SCO_MASK, &caps);
163 }
164
165 skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num));
166
167 vnd_codecs = skb_pull_data(skb, sizeof(*vnd_codecs));
168 if (!vnd_codecs)
169 goto error;
170
171 /* validate vendor codecs length before accessing */
172 if (skb->len < flex_array_size(vnd_codecs, codec, vnd_codecs->num))
173 goto error;
174
175 /* enumerate vendor codec capabilities */
176 for (i = 0; i < vnd_codecs->num; i++) {
177 caps.id = 0xFF;
178 caps.cid = vnd_codecs->codec[i].cid;
179 caps.vid = vnd_codecs->codec[i].vid;
180 caps.direction = 0x00;
181 hci_read_codec_capabilities(hdev,
182 LOCAL_CODEC_ACL_MASK | LOCAL_CODEC_SCO_MASK, &caps);
183 }
184
185error:
186 kfree_skb(skb);
187}
188
189void hci_read_supported_codecs_v2(struct hci_dev *hdev)
190{
191 struct sk_buff *skb;
192 struct hci_rp_read_local_supported_codecs_v2 *rp;
193 struct hci_std_codecs_v2 *std_codecs;
194 struct hci_vnd_codecs_v2 *vnd_codecs;
195 struct hci_op_read_local_codec_caps caps;
196 __u8 i;
197
198 skb = __hci_cmd_sync_sk(hdev, HCI_OP_READ_LOCAL_CODECS_V2, 0, NULL,
199 0, HCI_CMD_TIMEOUT, NULL);
200
201 if (IS_ERR(skb)) {
202 bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
203 PTR_ERR(skb));
204 return;
205 }
206
207 if (skb->len < sizeof(*rp))
208 goto error;
209
210 rp = (void *)skb->data;
211
212 if (rp->status)
213 goto error;
214
215 skb_pull(skb, sizeof(rp->status));
216
217 std_codecs = skb_pull_data(skb, sizeof(*std_codecs));
218 if (!std_codecs)
219 goto error;
220
221 /* check for payload data length before accessing */
222 if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num))
223 goto error;
224
225 memset(&caps, 0, sizeof(caps));
226
227 for (i = 0; i < std_codecs->num; i++) {
228 caps.id = std_codecs->codec[i].id;
229 hci_read_codec_capabilities(hdev, std_codecs->codec[i].transport,
230 &caps);
231 }
232
233 skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num));
234
235 vnd_codecs = skb_pull_data(skb, sizeof(*vnd_codecs));
236 if (!vnd_codecs)
237 goto error;
238
239 /* check for payload data length before accessing */
240 if (skb->len < flex_array_size(vnd_codecs, codec, vnd_codecs->num))
241 goto error;
242
243 for (i = 0; i < vnd_codecs->num; i++) {
244 caps.id = 0xFF;
245 caps.cid = vnd_codecs->codec[i].cid;
246 caps.vid = vnd_codecs->codec[i].vid;
247 hci_read_codec_capabilities(hdev, vnd_codecs->codec[i].transport,
248 &caps);
249 }
250
251error:
252 kfree_skb(skb);
253}