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(new: &entry->list, head: 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(entry: &c->list);
44 kfree(objp: 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(list: &hdev->local_codecs, sent: cmd,
70 NULL, NULL, len: 0);
71 hci_dev_unlock(hdev);
72 continue;
73 }
74
75 skb = __hci_cmd_sync_sk(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
76 plen: sizeof(*cmd), param: cmd, event: 0, HCI_CMD_TIMEOUT, NULL);
77 if (IS_ERR(ptr: 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, len: 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 < caps->len)
104 goto error;
105 len += sizeof(caps->len) + caps->len;
106 skb_pull(skb, len: sizeof(caps->len) + caps->len);
107 }
108
109skip_caps_parse:
110 hci_dev_lock(hdev);
111 hci_codec_list_add(list: &hdev->local_codecs, sent: cmd, rp,
112 caps: (__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, plen: 0, NULL,
130 event: 0, HCI_CMD_TIMEOUT, NULL);
131
132 if (IS_ERR(ptr: 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, len: sizeof(rp->status));
147
148 std_codecs = (void *)skb->data;
149
150 /* validate codecs length before accessing */
151 if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
152 + sizeof(std_codecs->num))
153 goto error;
154
155 /* enumerate codec capabilities of standard codecs */
156 memset(&caps, 0, sizeof(caps));
157 for (i = 0; i < std_codecs->num; i++) {
158 caps.id = std_codecs->codec[i];
159 caps.direction = 0x00;
160 hci_read_codec_capabilities(hdev,
161 LOCAL_CODEC_ACL_MASK | LOCAL_CODEC_SCO_MASK, cmd: &caps);
162 }
163
164 skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
165 + sizeof(std_codecs->num));
166
167 vnd_codecs = (void *)skb->data;
168
169 /* validate vendor codecs length before accessing */
170 if (skb->len <
171 flex_array_size(vnd_codecs, codec, vnd_codecs->num)
172 + sizeof(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, cmd: &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, plen: 0, NULL,
199 event: 0, HCI_CMD_TIMEOUT, NULL);
200
201 if (IS_ERR(ptr: 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, len: sizeof(rp->status));
216
217 std_codecs = (void *)skb->data;
218
219 /* check for payload data length before accessing */
220 if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
221 + sizeof(std_codecs->num))
222 goto error;
223
224 memset(&caps, 0, sizeof(caps));
225
226 for (i = 0; i < std_codecs->num; i++) {
227 caps.id = std_codecs->codec[i].id;
228 hci_read_codec_capabilities(hdev, transport: std_codecs->codec[i].transport,
229 cmd: &caps);
230 }
231
232 skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
233 + sizeof(std_codecs->num));
234
235 vnd_codecs = (void *)skb->data;
236
237 /* check for payload data length before accessing */
238 if (skb->len <
239 flex_array_size(vnd_codecs, codec, vnd_codecs->num)
240 + sizeof(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, transport: vnd_codecs->codec[i].transport,
248 cmd: &caps);
249 }
250
251error:
252 kfree_skb(skb);
253}
254

source code of linux/net/bluetooth/hci_codec.c