net/bluetooth/hci_codec.c

Source file repositories/reference/linux-study-clean/net/bluetooth/hci_codec.c

File Facts

System
Linux kernel
Corpus path
net/bluetooth/hci_codec.c
Extension
.c
Size
5983 bytes
Lines
254
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

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;

			/* If Read_Codec_Capabilities command is not supported
			 * then just add codec to the list without caps
			 */
			if (!(hdev->commands[45] & 0x08)) {
				hci_dev_lock(hdev);
				hci_codec_list_add(&hdev->local_codecs, cmd,
						   NULL, NULL, 0);
				hci_dev_unlock(hdev);
				continue;
			}

			skb = __hci_cmd_sync_sk(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS,
						sizeof(*cmd), cmd, 0, HCI_CMD_TIMEOUT, NULL);
			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 < sizeof(caps->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_sk(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL,
				0, HCI_CMD_TIMEOUT, NULL);

	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;

Annotation

Implementation Notes