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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Intel Corporation */
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_codec.h"
static int hci_codec_list_add(struct list_head *list,
struct hci_op_read_local_codec_caps *sent,
struct hci_rp_read_local_codec_caps *rp,
void *caps,
__u32 len)
{
struct codec_list *entry;
entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->id = sent->id;
if (sent->id == 0xFF) {
entry->cid = __le16_to_cpu(sent->cid);
entry->vid = __le16_to_cpu(sent->vid);
}
entry->transport = sent->transport;
entry->len = len;
entry->num_caps = rp->num_caps;
if (rp->num_caps)
memcpy(entry->caps, caps, len);
list_add(&entry->list, list);
return 0;
}
void hci_codec_list_clear(struct list_head *codec_list)
{
struct codec_list *c, *n;
list_for_each_entry_safe(c, n, codec_list, list) {
list_del(&c->list);
kfree(c);
}
}
static void hci_read_codec_capabilities(struct hci_dev *hdev, __u8 transport,
struct hci_op_read_local_codec_caps
*cmd)
{
__u8 i;
for (i = 0; i < TRANSPORT_TYPE_MAX; i++) {
if (transport & BIT(i)) {
struct hci_rp_read_local_codec_caps *rp;
struct hci_codec_caps *caps;
struct sk_buff *skb;
__u8 j;
__u32 len;
cmd->transport = i;
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
sizeof(*cmd), cmd,
HCI_CMD_TIMEOUT);
if (IS_ERR(skb)) {
bt_dev_err(hdev, "Failed to read codec capabilities (%ld)",
PTR_ERR(skb));
continue;
}
if (skb->len < sizeof(*rp))
goto error;
rp = (void *)skb->data;
if (rp->status)
goto error;
if (!rp->num_caps) {
len = 0;
/* this codec doesn't have capabilities */
goto skip_caps_parse;
}
skb_pull(skb, sizeof(*rp));
for (j = 0, len = 0; j < rp->num_caps; j++) {
caps = (void *)skb->data;
if (skb->len < sizeof(*caps))
goto error;
if (skb->len < caps->len)
goto error;
len += sizeof(caps->len) + caps->len;
skb_pull(skb, sizeof(caps->len) + caps->len);
}
skip_caps_parse:
hci_dev_lock(hdev);
hci_codec_list_add(&hdev->local_codecs, cmd, rp,
(__u8 *)rp + sizeof(*rp), len);
hci_dev_unlock(hdev);
error:
kfree_skb(skb);
}
}
}
void hci_read_supported_codecs(struct hci_dev *hdev)
{
struct sk_buff *skb;
struct hci_rp_read_local_supported_codecs *rp;
struct hci_std_codecs *std_codecs;
struct hci_vnd_codecs *vnd_codecs;
struct hci_op_read_local_codec_caps caps;
__u8 i;
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL,
HCI_CMD_TIMEOUT);
if (IS_ERR(skb)) {
bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
PTR_ERR(skb));
return;
}
if (skb->len < sizeof(*rp))
goto error;
rp = (void *)skb->data;
if (rp->status)
goto error;
skb_pull(skb, sizeof(rp->status));
std_codecs = (void *)skb->data;
/* validate codecs length before accessing */
if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
+ sizeof(std_codecs->num))
goto error;
/* enumerate codec capabilities of standard codecs */
memset(&caps, 0, sizeof(caps));
for (i = 0; i < std_codecs->num; i++) {
caps.id = std_codecs->codec[i];
caps.direction = 0x00;
hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps);
}
skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
+ sizeof(std_codecs->num));
vnd_codecs = (void *)skb->data;
/* validate vendor codecs length before accessing */
if (skb->len <
flex_array_size(vnd_codecs, codec, vnd_codecs->num)
+ sizeof(vnd_codecs->num))
goto error;
/* enumerate vendor codec capabilities */
for (i = 0; i < vnd_codecs->num; i++) {
caps.id = 0xFF;
caps.cid = vnd_codecs->codec[i].cid;
caps.vid = vnd_codecs->codec[i].vid;
caps.direction = 0x00;
hci_read_codec_capabilities(hdev, LOCAL_CODEC_ACL_MASK, &caps);
}
error:
kfree_skb(skb);
}
void hci_read_supported_codecs_v2(struct hci_dev *hdev)
{
struct sk_buff *skb;
struct hci_rp_read_local_supported_codecs_v2 *rp;
struct hci_std_codecs_v2 *std_codecs;
struct hci_vnd_codecs_v2 *vnd_codecs;
struct hci_op_read_local_codec_caps caps;
__u8 i;
skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS_V2, 0, NULL,
HCI_CMD_TIMEOUT);
if (IS_ERR(skb)) {
bt_dev_err(hdev, "Failed to read local supported codecs (%ld)",
PTR_ERR(skb));
return;
}
if (skb->len < sizeof(*rp))
goto error;
rp = (void *)skb->data;
if (rp->status)
goto error;
skb_pull(skb, sizeof(rp->status));
std_codecs = (void *)skb->data;
/* check for payload data length before accessing */
if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)
+ sizeof(std_codecs->num))
goto error;
memset(&caps, 0, sizeof(caps));
for (i = 0; i < std_codecs->num; i++) {
caps.id = std_codecs->codec[i].id;
hci_read_codec_capabilities(hdev, std_codecs->codec[i].transport,
&caps);
}
skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)
+ sizeof(std_codecs->num));
vnd_codecs = (void *)skb->data;
/* check for payload data length before accessing */
if (skb->len <
flex_array_size(vnd_codecs, codec, vnd_codecs->num)
+ sizeof(vnd_codecs->num))
goto error;
for (i = 0; i < vnd_codecs->num; i++) {
caps.id = 0xFF;
caps.cid = vnd_codecs->codec[i].cid;
caps.vid = vnd_codecs->codec[i].vid;
hci_read_codec_capabilities(hdev, vnd_codecs->codec[i].transport,
&caps);
}
error:
kfree_skb(skb);
}
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