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-rw-r--r--net/bluetooth/hci_conn.c2950
1 files changed, 2950 insertions, 0 deletions
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
new file mode 100644
index 0000000000..1fdf4b9053
--- /dev/null
+++ b/net/bluetooth/hci_conn.c
@@ -0,0 +1,2950 @@
+/*
+ BlueZ - Bluetooth protocol stack for Linux
+ Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
+ Copyright 2023 NXP
+
+ Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+/* Bluetooth HCI connection handling. */
+
+#include <linux/export.h>
+#include <linux/debugfs.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+#include <net/bluetooth/iso.h>
+#include <net/bluetooth/mgmt.h>
+
+#include "hci_request.h"
+#include "smp.h"
+#include "a2mp.h"
+#include "eir.h"
+
+struct sco_param {
+ u16 pkt_type;
+ u16 max_latency;
+ u8 retrans_effort;
+};
+
+struct conn_handle_t {
+ struct hci_conn *conn;
+ __u16 handle;
+};
+
+static const struct sco_param esco_param_cvsd[] = {
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
+ { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
+ { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
+ { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
+};
+
+static const struct sco_param sco_param_cvsd[] = {
+ { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
+ { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
+};
+
+static const struct sco_param esco_param_msbc[] = {
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
+ { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
+};
+
+/* This function requires the caller holds hdev->lock */
+static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
+{
+ struct hci_conn_params *params;
+ struct hci_dev *hdev = conn->hdev;
+ struct smp_irk *irk;
+ bdaddr_t *bdaddr;
+ u8 bdaddr_type;
+
+ bdaddr = &conn->dst;
+ bdaddr_type = conn->dst_type;
+
+ /* Check if we need to convert to identity address */
+ irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
+ if (irk) {
+ bdaddr = &irk->bdaddr;
+ bdaddr_type = irk->addr_type;
+ }
+
+ params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
+ bdaddr_type);
+ if (!params)
+ return;
+
+ if (params->conn) {
+ hci_conn_drop(params->conn);
+ hci_conn_put(params->conn);
+ params->conn = NULL;
+ }
+
+ if (!params->explicit_connect)
+ return;
+
+ /* If the status indicates successful cancellation of
+ * the attempt (i.e. Unknown Connection Id) there's no point of
+ * notifying failure since we'll go back to keep trying to
+ * connect. The only exception is explicit connect requests
+ * where a timeout + cancel does indicate an actual failure.
+ */
+ if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
+ mgmt_connect_failed(hdev, &conn->dst, conn->type,
+ conn->dst_type, status);
+
+ /* The connection attempt was doing scan for new RPA, and is
+ * in scan phase. If params are not associated with any other
+ * autoconnect action, remove them completely. If they are, just unmark
+ * them as waiting for connection, by clearing explicit_connect field.
+ */
+ params->explicit_connect = false;
+
+ hci_pend_le_list_del_init(params);
+
+ switch (params->auto_connect) {
+ case HCI_AUTO_CONN_EXPLICIT:
+ hci_conn_params_del(hdev, bdaddr, bdaddr_type);
+ /* return instead of break to avoid duplicate scan update */
+ return;
+ case HCI_AUTO_CONN_DIRECT:
+ case HCI_AUTO_CONN_ALWAYS:
+ hci_pend_le_list_add(params, &hdev->pend_le_conns);
+ break;
+ case HCI_AUTO_CONN_REPORT:
+ hci_pend_le_list_add(params, &hdev->pend_le_reports);
+ break;
+ default:
+ break;
+ }
+
+ hci_update_passive_scan(hdev);
+}
+
+static void hci_conn_cleanup(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
+ hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
+
+ if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
+ hci_remove_link_key(hdev, &conn->dst);
+
+ hci_chan_list_flush(conn);
+
+ hci_conn_hash_del(hdev, conn);
+
+ if (HCI_CONN_HANDLE_UNSET(conn->handle))
+ ida_free(&hdev->unset_handle_ida, conn->handle);
+
+ if (conn->cleanup)
+ conn->cleanup(conn);
+
+ if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
+ switch (conn->setting & SCO_AIRMODE_MASK) {
+ case SCO_AIRMODE_CVSD:
+ case SCO_AIRMODE_TRANSP:
+ if (hdev->notify)
+ hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
+ break;
+ }
+ } else {
+ if (hdev->notify)
+ hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
+ }
+
+ debugfs_remove_recursive(conn->debugfs);
+
+ hci_conn_del_sysfs(conn);
+
+ hci_dev_put(hdev);
+}
+
+static void hci_acl_create_connection(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct inquiry_entry *ie;
+ struct hci_cp_create_conn cp;
+
+ BT_DBG("hcon %p", conn);
+
+ /* Many controllers disallow HCI Create Connection while it is doing
+ * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
+ * Connection. This may cause the MGMT discovering state to become false
+ * without user space's request but it is okay since the MGMT Discovery
+ * APIs do not promise that discovery should be done forever. Instead,
+ * the user space monitors the status of MGMT discovering and it may
+ * request for discovery again when this flag becomes false.
+ */
+ if (test_bit(HCI_INQUIRY, &hdev->flags)) {
+ /* Put this connection to "pending" state so that it will be
+ * executed after the inquiry cancel command complete event.
+ */
+ conn->state = BT_CONNECT2;
+ hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
+ return;
+ }
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+ conn->role = HCI_ROLE_MASTER;
+
+ conn->attempt++;
+
+ conn->link_policy = hdev->link_policy;
+
+ memset(&cp, 0, sizeof(cp));
+ bacpy(&cp.bdaddr, &conn->dst);
+ cp.pscan_rep_mode = 0x02;
+
+ ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
+ if (ie) {
+ if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
+ cp.pscan_rep_mode = ie->data.pscan_rep_mode;
+ cp.pscan_mode = ie->data.pscan_mode;
+ cp.clock_offset = ie->data.clock_offset |
+ cpu_to_le16(0x8000);
+ }
+
+ memcpy(conn->dev_class, ie->data.dev_class, 3);
+ }
+
+ cp.pkt_type = cpu_to_le16(conn->pkt_type);
+ if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
+ cp.role_switch = 0x01;
+ else
+ cp.role_switch = 0x00;
+
+ hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
+}
+
+int hci_disconnect(struct hci_conn *conn, __u8 reason)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* When we are central of an established connection and it enters
+ * the disconnect timeout, then go ahead and try to read the
+ * current clock offset. Processing of the result is done
+ * within the event handling and hci_clock_offset_evt function.
+ */
+ if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
+ (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_read_clock_offset clkoff_cp;
+
+ clkoff_cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
+ &clkoff_cp);
+ }
+
+ return hci_abort_conn(conn, reason);
+}
+
+static void hci_add_sco(struct hci_conn *conn, __u16 handle)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_add_sco cp;
+
+ BT_DBG("hcon %p", conn);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+
+ conn->attempt++;
+
+ cp.handle = cpu_to_le16(handle);
+ cp.pkt_type = cpu_to_le16(conn->pkt_type);
+
+ hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
+}
+
+static bool find_next_esco_param(struct hci_conn *conn,
+ const struct sco_param *esco_param, int size)
+{
+ if (!conn->parent)
+ return false;
+
+ for (; conn->attempt <= size; conn->attempt++) {
+ if (lmp_esco_2m_capable(conn->parent) ||
+ (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
+ break;
+ BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
+ conn, conn->attempt);
+ }
+
+ return conn->attempt <= size;
+}
+
+static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
+{
+ int err;
+ __u8 vnd_len, *vnd_data = NULL;
+ struct hci_op_configure_data_path *cmd = NULL;
+
+ err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
+ &vnd_data);
+ if (err < 0)
+ goto error;
+
+ cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
+ if (!cmd) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
+ if (err < 0)
+ goto error;
+
+ cmd->vnd_len = vnd_len;
+ memcpy(cmd->vnd_data, vnd_data, vnd_len);
+
+ cmd->direction = 0x00;
+ __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
+ sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
+
+ cmd->direction = 0x01;
+ err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
+ sizeof(*cmd) + vnd_len, cmd,
+ HCI_CMD_TIMEOUT);
+error:
+
+ kfree(cmd);
+ kfree(vnd_data);
+ return err;
+}
+
+static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
+{
+ struct conn_handle_t *conn_handle = data;
+ struct hci_conn *conn = conn_handle->conn;
+ __u16 handle = conn_handle->handle;
+ struct hci_cp_enhanced_setup_sync_conn cp;
+ const struct sco_param *param;
+
+ kfree(conn_handle);
+
+ bt_dev_dbg(hdev, "hcon %p", conn);
+
+ /* for offload use case, codec needs to configured before opening SCO */
+ if (conn->codec.data_path)
+ configure_datapath_sync(hdev, &conn->codec);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+
+ conn->attempt++;
+
+ memset(&cp, 0x00, sizeof(cp));
+
+ cp.handle = cpu_to_le16(handle);
+
+ cp.tx_bandwidth = cpu_to_le32(0x00001f40);
+ cp.rx_bandwidth = cpu_to_le32(0x00001f40);
+
+ switch (conn->codec.id) {
+ case BT_CODEC_MSBC:
+ if (!find_next_esco_param(conn, esco_param_msbc,
+ ARRAY_SIZE(esco_param_msbc)))
+ return -EINVAL;
+
+ param = &esco_param_msbc[conn->attempt - 1];
+ cp.tx_coding_format.id = 0x05;
+ cp.rx_coding_format.id = 0x05;
+ cp.tx_codec_frame_size = __cpu_to_le16(60);
+ cp.rx_codec_frame_size = __cpu_to_le16(60);
+ cp.in_bandwidth = __cpu_to_le32(32000);
+ cp.out_bandwidth = __cpu_to_le32(32000);
+ cp.in_coding_format.id = 0x04;
+ cp.out_coding_format.id = 0x04;
+ cp.in_coded_data_size = __cpu_to_le16(16);
+ cp.out_coded_data_size = __cpu_to_le16(16);
+ cp.in_pcm_data_format = 2;
+ cp.out_pcm_data_format = 2;
+ cp.in_pcm_sample_payload_msb_pos = 0;
+ cp.out_pcm_sample_payload_msb_pos = 0;
+ cp.in_data_path = conn->codec.data_path;
+ cp.out_data_path = conn->codec.data_path;
+ cp.in_transport_unit_size = 1;
+ cp.out_transport_unit_size = 1;
+ break;
+
+ case BT_CODEC_TRANSPARENT:
+ if (!find_next_esco_param(conn, esco_param_msbc,
+ ARRAY_SIZE(esco_param_msbc)))
+ return false;
+ param = &esco_param_msbc[conn->attempt - 1];
+ cp.tx_coding_format.id = 0x03;
+ cp.rx_coding_format.id = 0x03;
+ cp.tx_codec_frame_size = __cpu_to_le16(60);
+ cp.rx_codec_frame_size = __cpu_to_le16(60);
+ cp.in_bandwidth = __cpu_to_le32(0x1f40);
+ cp.out_bandwidth = __cpu_to_le32(0x1f40);
+ cp.in_coding_format.id = 0x03;
+ cp.out_coding_format.id = 0x03;
+ cp.in_coded_data_size = __cpu_to_le16(16);
+ cp.out_coded_data_size = __cpu_to_le16(16);
+ cp.in_pcm_data_format = 2;
+ cp.out_pcm_data_format = 2;
+ cp.in_pcm_sample_payload_msb_pos = 0;
+ cp.out_pcm_sample_payload_msb_pos = 0;
+ cp.in_data_path = conn->codec.data_path;
+ cp.out_data_path = conn->codec.data_path;
+ cp.in_transport_unit_size = 1;
+ cp.out_transport_unit_size = 1;
+ break;
+
+ case BT_CODEC_CVSD:
+ if (conn->parent && lmp_esco_capable(conn->parent)) {
+ if (!find_next_esco_param(conn, esco_param_cvsd,
+ ARRAY_SIZE(esco_param_cvsd)))
+ return -EINVAL;
+ param = &esco_param_cvsd[conn->attempt - 1];
+ } else {
+ if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
+ return -EINVAL;
+ param = &sco_param_cvsd[conn->attempt - 1];
+ }
+ cp.tx_coding_format.id = 2;
+ cp.rx_coding_format.id = 2;
+ cp.tx_codec_frame_size = __cpu_to_le16(60);
+ cp.rx_codec_frame_size = __cpu_to_le16(60);
+ cp.in_bandwidth = __cpu_to_le32(16000);
+ cp.out_bandwidth = __cpu_to_le32(16000);
+ cp.in_coding_format.id = 4;
+ cp.out_coding_format.id = 4;
+ cp.in_coded_data_size = __cpu_to_le16(16);
+ cp.out_coded_data_size = __cpu_to_le16(16);
+ cp.in_pcm_data_format = 2;
+ cp.out_pcm_data_format = 2;
+ cp.in_pcm_sample_payload_msb_pos = 0;
+ cp.out_pcm_sample_payload_msb_pos = 0;
+ cp.in_data_path = conn->codec.data_path;
+ cp.out_data_path = conn->codec.data_path;
+ cp.in_transport_unit_size = 16;
+ cp.out_transport_unit_size = 16;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ cp.retrans_effort = param->retrans_effort;
+ cp.pkt_type = __cpu_to_le16(param->pkt_type);
+ cp.max_latency = __cpu_to_le16(param->max_latency);
+
+ if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
+ return -EIO;
+
+ return 0;
+}
+
+static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_setup_sync_conn cp;
+ const struct sco_param *param;
+
+ bt_dev_dbg(hdev, "hcon %p", conn);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+
+ conn->attempt++;
+
+ cp.handle = cpu_to_le16(handle);
+
+ cp.tx_bandwidth = cpu_to_le32(0x00001f40);
+ cp.rx_bandwidth = cpu_to_le32(0x00001f40);
+ cp.voice_setting = cpu_to_le16(conn->setting);
+
+ switch (conn->setting & SCO_AIRMODE_MASK) {
+ case SCO_AIRMODE_TRANSP:
+ if (!find_next_esco_param(conn, esco_param_msbc,
+ ARRAY_SIZE(esco_param_msbc)))
+ return false;
+ param = &esco_param_msbc[conn->attempt - 1];
+ break;
+ case SCO_AIRMODE_CVSD:
+ if (conn->parent && lmp_esco_capable(conn->parent)) {
+ if (!find_next_esco_param(conn, esco_param_cvsd,
+ ARRAY_SIZE(esco_param_cvsd)))
+ return false;
+ param = &esco_param_cvsd[conn->attempt - 1];
+ } else {
+ if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
+ return false;
+ param = &sco_param_cvsd[conn->attempt - 1];
+ }
+ break;
+ default:
+ return false;
+ }
+
+ cp.retrans_effort = param->retrans_effort;
+ cp.pkt_type = __cpu_to_le16(param->pkt_type);
+ cp.max_latency = __cpu_to_le16(param->max_latency);
+
+ if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
+ return false;
+
+ return true;
+}
+
+bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
+{
+ int result;
+ struct conn_handle_t *conn_handle;
+
+ if (enhanced_sync_conn_capable(conn->hdev)) {
+ conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
+
+ if (!conn_handle)
+ return false;
+
+ conn_handle->conn = conn;
+ conn_handle->handle = handle;
+ result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
+ conn_handle, NULL);
+ if (result < 0)
+ kfree(conn_handle);
+
+ return result == 0;
+ }
+
+ return hci_setup_sync_conn(conn, handle);
+}
+
+u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
+ u16 to_multiplier)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_conn_params *params;
+ struct hci_cp_le_conn_update cp;
+
+ hci_dev_lock(hdev);
+
+ params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
+ if (params) {
+ params->conn_min_interval = min;
+ params->conn_max_interval = max;
+ params->conn_latency = latency;
+ params->supervision_timeout = to_multiplier;
+ }
+
+ hci_dev_unlock(hdev);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.conn_interval_min = cpu_to_le16(min);
+ cp.conn_interval_max = cpu_to_le16(max);
+ cp.conn_latency = cpu_to_le16(latency);
+ cp.supervision_timeout = cpu_to_le16(to_multiplier);
+ cp.min_ce_len = cpu_to_le16(0x0000);
+ cp.max_ce_len = cpu_to_le16(0x0000);
+
+ hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
+
+ if (params)
+ return 0x01;
+
+ return 0x00;
+}
+
+void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
+ __u8 ltk[16], __u8 key_size)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_le_start_enc cp;
+
+ BT_DBG("hcon %p", conn);
+
+ memset(&cp, 0, sizeof(cp));
+
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.rand = rand;
+ cp.ediv = ediv;
+ memcpy(cp.ltk, ltk, key_size);
+
+ hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
+}
+
+/* Device _must_ be locked */
+void hci_sco_setup(struct hci_conn *conn, __u8 status)
+{
+ struct hci_link *link;
+
+ link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
+ if (!link || !link->conn)
+ return;
+
+ BT_DBG("hcon %p", conn);
+
+ if (!status) {
+ if (lmp_esco_capable(conn->hdev))
+ hci_setup_sync(link->conn, conn->handle);
+ else
+ hci_add_sco(link->conn, conn->handle);
+ } else {
+ hci_connect_cfm(link->conn, status);
+ hci_conn_del(link->conn);
+ }
+}
+
+static void hci_conn_timeout(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ disc_work.work);
+ int refcnt = atomic_read(&conn->refcnt);
+
+ BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
+
+ WARN_ON(refcnt < 0);
+
+ /* FIXME: It was observed that in pairing failed scenario, refcnt
+ * drops below 0. Probably this is because l2cap_conn_del calls
+ * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
+ * dropped. After that loop hci_chan_del is called which also drops
+ * conn. For now make sure that ACL is alive if refcnt is higher then 0,
+ * otherwise drop it.
+ */
+ if (refcnt > 0)
+ return;
+
+ hci_abort_conn(conn, hci_proto_disconn_ind(conn));
+}
+
+/* Enter sniff mode */
+static void hci_conn_idle(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ idle_work.work);
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("hcon %p mode %d", conn, conn->mode);
+
+ if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
+ return;
+
+ if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
+ return;
+
+ if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
+ struct hci_cp_sniff_subrate cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.max_latency = cpu_to_le16(0);
+ cp.min_remote_timeout = cpu_to_le16(0);
+ cp.min_local_timeout = cpu_to_le16(0);
+ hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
+ }
+
+ if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
+ struct hci_cp_sniff_mode cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
+ cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
+ cp.attempt = cpu_to_le16(4);
+ cp.timeout = cpu_to_le16(1);
+ hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
+ }
+}
+
+static void hci_conn_auto_accept(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ auto_accept_work.work);
+
+ hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
+ &conn->dst);
+}
+
+static void le_disable_advertising(struct hci_dev *hdev)
+{
+ if (ext_adv_capable(hdev)) {
+ struct hci_cp_le_set_ext_adv_enable cp;
+
+ cp.enable = 0x00;
+ cp.num_of_sets = 0x00;
+
+ hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
+ &cp);
+ } else {
+ u8 enable = 0x00;
+ hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
+ &enable);
+ }
+}
+
+static void le_conn_timeout(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ le_conn_timeout.work);
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("");
+
+ /* We could end up here due to having done directed advertising,
+ * so clean up the state if necessary. This should however only
+ * happen with broken hardware or if low duty cycle was used
+ * (which doesn't have a timeout of its own).
+ */
+ if (conn->role == HCI_ROLE_SLAVE) {
+ /* Disable LE Advertising */
+ le_disable_advertising(hdev);
+ hci_dev_lock(hdev);
+ hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
+ hci_dev_unlock(hdev);
+ return;
+ }
+
+ hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
+}
+
+struct iso_cig_params {
+ struct hci_cp_le_set_cig_params cp;
+ struct hci_cis_params cis[0x1f];
+};
+
+struct iso_list_data {
+ union {
+ u8 cig;
+ u8 big;
+ };
+ union {
+ u8 cis;
+ u8 bis;
+ u16 sync_handle;
+ };
+ int count;
+ bool big_term;
+ bool pa_sync_term;
+ bool big_sync_term;
+};
+
+static void bis_list(struct hci_conn *conn, void *data)
+{
+ struct iso_list_data *d = data;
+
+ /* Skip if not broadcast/ANY address */
+ if (bacmp(&conn->dst, BDADDR_ANY))
+ return;
+
+ if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
+ d->bis != conn->iso_qos.bcast.bis)
+ return;
+
+ d->count++;
+}
+
+static int terminate_big_sync(struct hci_dev *hdev, void *data)
+{
+ struct iso_list_data *d = data;
+
+ bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
+
+ hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
+
+ /* Only terminate BIG if it has been created */
+ if (!d->big_term)
+ return 0;
+
+ return hci_le_terminate_big_sync(hdev, d->big,
+ HCI_ERROR_LOCAL_HOST_TERM);
+}
+
+static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
+{
+ kfree(data);
+}
+
+static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
+{
+ struct iso_list_data *d;
+ int ret;
+
+ bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
+ conn->iso_qos.bcast.bis);
+
+ d = kzalloc(sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ d->big = conn->iso_qos.bcast.big;
+ d->bis = conn->iso_qos.bcast.bis;
+ d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
+
+ ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
+ terminate_big_destroy);
+ if (ret)
+ kfree(d);
+
+ return ret;
+}
+
+static int big_terminate_sync(struct hci_dev *hdev, void *data)
+{
+ struct iso_list_data *d = data;
+
+ bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
+ d->sync_handle);
+
+ if (d->big_sync_term)
+ hci_le_big_terminate_sync(hdev, d->big);
+
+ if (d->pa_sync_term)
+ return hci_le_pa_terminate_sync(hdev, d->sync_handle);
+
+ return 0;
+}
+
+static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
+{
+ struct iso_list_data *d;
+ int ret;
+
+ bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
+
+ d = kzalloc(sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ d->big = big;
+ d->sync_handle = conn->sync_handle;
+ d->pa_sync_term = test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags);
+ d->big_sync_term = test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags);
+
+ ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
+ terminate_big_destroy);
+ if (ret)
+ kfree(d);
+
+ return ret;
+}
+
+/* Cleanup BIS connection
+ *
+ * Detects if there any BIS left connected in a BIG
+ * broadcaster: Remove advertising instance and terminate BIG.
+ * broadcaster receiver: Teminate BIG sync and terminate PA sync.
+ */
+static void bis_cleanup(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_conn *bis;
+
+ bt_dev_dbg(hdev, "conn %p", conn);
+
+ if (conn->role == HCI_ROLE_MASTER) {
+ if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
+ return;
+
+ /* Check if ISO connection is a BIS and terminate advertising
+ * set and BIG if there are no other connections using it.
+ */
+ bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
+ if (bis)
+ return;
+
+ hci_le_terminate_big(hdev, conn);
+ } else {
+ bis = hci_conn_hash_lookup_big_any_dst(hdev,
+ conn->iso_qos.bcast.big);
+
+ if (bis)
+ return;
+
+ hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
+ conn);
+ }
+}
+
+static int remove_cig_sync(struct hci_dev *hdev, void *data)
+{
+ u8 handle = PTR_UINT(data);
+
+ return hci_le_remove_cig_sync(hdev, handle);
+}
+
+static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
+{
+ bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
+
+ return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
+ NULL);
+}
+
+static void find_cis(struct hci_conn *conn, void *data)
+{
+ struct iso_list_data *d = data;
+
+ /* Ignore broadcast or if CIG don't match */
+ if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
+ return;
+
+ d->count++;
+}
+
+/* Cleanup CIS connection:
+ *
+ * Detects if there any CIS left connected in a CIG and remove it.
+ */
+static void cis_cleanup(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct iso_list_data d;
+
+ if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
+ return;
+
+ memset(&d, 0, sizeof(d));
+ d.cig = conn->iso_qos.ucast.cig;
+
+ /* Check if ISO connection is a CIS and remove CIG if there are
+ * no other connections using it.
+ */
+ hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d);
+ hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d);
+ hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
+ if (d.count)
+ return;
+
+ hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
+}
+
+static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
+{
+ return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
+ U16_MAX, GFP_ATOMIC);
+}
+
+struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
+ u8 role, u16 handle)
+{
+ struct hci_conn *conn;
+
+ bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
+
+ conn = kzalloc(sizeof(*conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+
+ bacpy(&conn->dst, dst);
+ bacpy(&conn->src, &hdev->bdaddr);
+ conn->handle = handle;
+ conn->hdev = hdev;
+ conn->type = type;
+ conn->role = role;
+ conn->mode = HCI_CM_ACTIVE;
+ conn->state = BT_OPEN;
+ conn->auth_type = HCI_AT_GENERAL_BONDING;
+ conn->io_capability = hdev->io_capability;
+ conn->remote_auth = 0xff;
+ conn->key_type = 0xff;
+ conn->rssi = HCI_RSSI_INVALID;
+ conn->tx_power = HCI_TX_POWER_INVALID;
+ conn->max_tx_power = HCI_TX_POWER_INVALID;
+ conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
+
+ set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
+ conn->disc_timeout = HCI_DISCONN_TIMEOUT;
+
+ /* Set Default Authenticated payload timeout to 30s */
+ conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
+
+ if (conn->role == HCI_ROLE_MASTER)
+ conn->out = true;
+
+ switch (type) {
+ case ACL_LINK:
+ conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
+ break;
+ case LE_LINK:
+ /* conn->src should reflect the local identity address */
+ hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
+ break;
+ case ISO_LINK:
+ /* conn->src should reflect the local identity address */
+ hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
+
+ /* set proper cleanup function */
+ if (!bacmp(dst, BDADDR_ANY))
+ conn->cleanup = bis_cleanup;
+ else if (conn->role == HCI_ROLE_MASTER)
+ conn->cleanup = cis_cleanup;
+
+ break;
+ case SCO_LINK:
+ if (lmp_esco_capable(hdev))
+ conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
+ (hdev->esco_type & EDR_ESCO_MASK);
+ else
+ conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
+ break;
+ case ESCO_LINK:
+ conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
+ break;
+ }
+
+ skb_queue_head_init(&conn->data_q);
+
+ INIT_LIST_HEAD(&conn->chan_list);
+ INIT_LIST_HEAD(&conn->link_list);
+
+ INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
+ INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
+ INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
+ INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
+
+ atomic_set(&conn->refcnt, 0);
+
+ hci_dev_hold(hdev);
+
+ hci_conn_hash_add(hdev, conn);
+
+ /* The SCO and eSCO connections will only be notified when their
+ * setup has been completed. This is different to ACL links which
+ * can be notified right away.
+ */
+ if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
+ if (hdev->notify)
+ hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
+ }
+
+ hci_conn_init_sysfs(conn);
+
+ return conn;
+}
+
+struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
+ bdaddr_t *dst, u8 role)
+{
+ int handle;
+
+ bt_dev_dbg(hdev, "dst %pMR", dst);
+
+ handle = hci_conn_hash_alloc_unset(hdev);
+ if (unlikely(handle < 0))
+ return NULL;
+
+ return hci_conn_add(hdev, type, dst, role, handle);
+}
+
+static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
+{
+ if (!reason)
+ reason = HCI_ERROR_REMOTE_USER_TERM;
+
+ /* Due to race, SCO/ISO conn might be not established yet at this point,
+ * and nothing else will clean it up. In other cases it is done via HCI
+ * events.
+ */
+ switch (conn->type) {
+ case SCO_LINK:
+ case ESCO_LINK:
+ if (HCI_CONN_HANDLE_UNSET(conn->handle))
+ hci_conn_failed(conn, reason);
+ break;
+ case ISO_LINK:
+ if (conn->state != BT_CONNECTED &&
+ !test_bit(HCI_CONN_CREATE_CIS, &conn->flags))
+ hci_conn_failed(conn, reason);
+ break;
+ }
+}
+
+static void hci_conn_unlink(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ bt_dev_dbg(hdev, "hcon %p", conn);
+
+ if (!conn->parent) {
+ struct hci_link *link, *t;
+
+ list_for_each_entry_safe(link, t, &conn->link_list, list) {
+ struct hci_conn *child = link->conn;
+
+ hci_conn_unlink(child);
+
+ /* If hdev is down it means
+ * hci_dev_close_sync/hci_conn_hash_flush is in progress
+ * and links don't need to be cleanup as all connections
+ * would be cleanup.
+ */
+ if (!test_bit(HCI_UP, &hdev->flags))
+ continue;
+
+ hci_conn_cleanup_child(child, conn->abort_reason);
+ }
+
+ return;
+ }
+
+ if (!conn->link)
+ return;
+
+ list_del_rcu(&conn->link->list);
+ synchronize_rcu();
+
+ hci_conn_drop(conn->parent);
+ hci_conn_put(conn->parent);
+ conn->parent = NULL;
+
+ kfree(conn->link);
+ conn->link = NULL;
+}
+
+void hci_conn_del(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
+
+ hci_conn_unlink(conn);
+
+ cancel_delayed_work_sync(&conn->disc_work);
+ cancel_delayed_work_sync(&conn->auto_accept_work);
+ cancel_delayed_work_sync(&conn->idle_work);
+
+ if (conn->type == ACL_LINK) {
+ /* Unacked frames */
+ hdev->acl_cnt += conn->sent;
+ } else if (conn->type == LE_LINK) {
+ cancel_delayed_work(&conn->le_conn_timeout);
+
+ if (hdev->le_pkts)
+ hdev->le_cnt += conn->sent;
+ else
+ hdev->acl_cnt += conn->sent;
+ } else {
+ /* Unacked ISO frames */
+ if (conn->type == ISO_LINK) {
+ if (hdev->iso_pkts)
+ hdev->iso_cnt += conn->sent;
+ else if (hdev->le_pkts)
+ hdev->le_cnt += conn->sent;
+ else
+ hdev->acl_cnt += conn->sent;
+ }
+ }
+
+ if (conn->amp_mgr)
+ amp_mgr_put(conn->amp_mgr);
+
+ skb_queue_purge(&conn->data_q);
+
+ /* Remove the connection from the list and cleanup its remaining
+ * state. This is a separate function since for some cases like
+ * BT_CONNECT_SCAN we *only* want the cleanup part without the
+ * rest of hci_conn_del.
+ */
+ hci_conn_cleanup(conn);
+}
+
+struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
+{
+ int use_src = bacmp(src, BDADDR_ANY);
+ struct hci_dev *hdev = NULL, *d;
+
+ BT_DBG("%pMR -> %pMR", src, dst);
+
+ read_lock(&hci_dev_list_lock);
+
+ list_for_each_entry(d, &hci_dev_list, list) {
+ if (!test_bit(HCI_UP, &d->flags) ||
+ hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
+ d->dev_type != HCI_PRIMARY)
+ continue;
+
+ /* Simple routing:
+ * No source address - find interface with bdaddr != dst
+ * Source address - find interface with bdaddr == src
+ */
+
+ if (use_src) {
+ bdaddr_t id_addr;
+ u8 id_addr_type;
+
+ if (src_type == BDADDR_BREDR) {
+ if (!lmp_bredr_capable(d))
+ continue;
+ bacpy(&id_addr, &d->bdaddr);
+ id_addr_type = BDADDR_BREDR;
+ } else {
+ if (!lmp_le_capable(d))
+ continue;
+
+ hci_copy_identity_address(d, &id_addr,
+ &id_addr_type);
+
+ /* Convert from HCI to three-value type */
+ if (id_addr_type == ADDR_LE_DEV_PUBLIC)
+ id_addr_type = BDADDR_LE_PUBLIC;
+ else
+ id_addr_type = BDADDR_LE_RANDOM;
+ }
+
+ if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
+ hdev = d; break;
+ }
+ } else {
+ if (bacmp(&d->bdaddr, dst)) {
+ hdev = d; break;
+ }
+ }
+ }
+
+ if (hdev)
+ hdev = hci_dev_hold(hdev);
+
+ read_unlock(&hci_dev_list_lock);
+ return hdev;
+}
+EXPORT_SYMBOL(hci_get_route);
+
+/* This function requires the caller holds hdev->lock */
+static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ hci_connect_le_scan_cleanup(conn, status);
+
+ /* Enable advertising in case this was a failed connection
+ * attempt as a peripheral.
+ */
+ hci_enable_advertising(hdev);
+}
+
+/* This function requires the caller holds hdev->lock */
+void hci_conn_failed(struct hci_conn *conn, u8 status)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ bt_dev_dbg(hdev, "status 0x%2.2x", status);
+
+ switch (conn->type) {
+ case LE_LINK:
+ hci_le_conn_failed(conn, status);
+ break;
+ case ACL_LINK:
+ mgmt_connect_failed(hdev, &conn->dst, conn->type,
+ conn->dst_type, status);
+ break;
+ }
+
+ conn->state = BT_CLOSED;
+ hci_connect_cfm(conn, status);
+ hci_conn_del(conn);
+}
+
+/* This function requires the caller holds hdev->lock */
+u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
+
+ if (conn->handle == handle)
+ return 0;
+
+ if (handle > HCI_CONN_HANDLE_MAX) {
+ bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
+ handle, HCI_CONN_HANDLE_MAX);
+ return HCI_ERROR_INVALID_PARAMETERS;
+ }
+
+ /* If abort_reason has been sent it means the connection is being
+ * aborted and the handle shall not be changed.
+ */
+ if (conn->abort_reason)
+ return conn->abort_reason;
+
+ if (HCI_CONN_HANDLE_UNSET(conn->handle))
+ ida_free(&hdev->unset_handle_ida, conn->handle);
+
+ conn->handle = handle;
+
+ return 0;
+}
+
+static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
+{
+ struct hci_conn *conn;
+ u16 handle = PTR_UINT(data);
+
+ conn = hci_conn_hash_lookup_handle(hdev, handle);
+ if (!conn)
+ return;
+
+ bt_dev_dbg(hdev, "err %d", err);
+
+ hci_dev_lock(hdev);
+
+ if (!err) {
+ hci_connect_le_scan_cleanup(conn, 0x00);
+ goto done;
+ }
+
+ /* Check if connection is still pending */
+ if (conn != hci_lookup_le_connect(hdev))
+ goto done;
+
+ /* Flush to make sure we send create conn cancel command if needed */
+ flush_delayed_work(&conn->le_conn_timeout);
+ hci_conn_failed(conn, bt_status(err));
+
+done:
+ hci_dev_unlock(hdev);
+}
+
+static int hci_connect_le_sync(struct hci_dev *hdev, void *data)
+{
+ struct hci_conn *conn;
+ u16 handle = PTR_UINT(data);
+
+ conn = hci_conn_hash_lookup_handle(hdev, handle);
+ if (!conn)
+ return 0;
+
+ bt_dev_dbg(hdev, "conn %p", conn);
+
+ clear_bit(HCI_CONN_SCANNING, &conn->flags);
+ conn->state = BT_CONNECT;
+
+ return hci_le_create_conn_sync(hdev, conn);
+}
+
+struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 dst_type, bool dst_resolved, u8 sec_level,
+ u16 conn_timeout, u8 role)
+{
+ struct hci_conn *conn;
+ struct smp_irk *irk;
+ int err;
+
+ /* Let's make sure that le is enabled.*/
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
+ if (lmp_le_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Since the controller supports only one LE connection attempt at a
+ * time, we return -EBUSY if there is any connection attempt running.
+ */
+ if (hci_lookup_le_connect(hdev))
+ return ERR_PTR(-EBUSY);
+
+ /* If there's already a connection object but it's not in
+ * scanning state it means it must already be established, in
+ * which case we can't do anything else except report a failure
+ * to connect.
+ */
+ conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
+ if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
+ return ERR_PTR(-EBUSY);
+ }
+
+ /* Check if the destination address has been resolved by the controller
+ * since if it did then the identity address shall be used.
+ */
+ if (!dst_resolved) {
+ /* When given an identity address with existing identity
+ * resolving key, the connection needs to be established
+ * to a resolvable random address.
+ *
+ * Storing the resolvable random address is required here
+ * to handle connection failures. The address will later
+ * be resolved back into the original identity address
+ * from the connect request.
+ */
+ irk = hci_find_irk_by_addr(hdev, dst, dst_type);
+ if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
+ dst = &irk->rpa;
+ dst_type = ADDR_LE_DEV_RANDOM;
+ }
+ }
+
+ if (conn) {
+ bacpy(&conn->dst, dst);
+ } else {
+ conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+ hci_conn_hold(conn);
+ conn->pending_sec_level = sec_level;
+ }
+
+ conn->dst_type = dst_type;
+ conn->sec_level = BT_SECURITY_LOW;
+ conn->conn_timeout = conn_timeout;
+
+ err = hci_cmd_sync_queue(hdev, hci_connect_le_sync,
+ UINT_PTR(conn->handle),
+ create_le_conn_complete);
+ if (err) {
+ hci_conn_del(conn);
+ return ERR_PTR(err);
+ }
+
+ return conn;
+}
+
+static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
+{
+ struct hci_conn *conn;
+
+ conn = hci_conn_hash_lookup_le(hdev, addr, type);
+ if (!conn)
+ return false;
+
+ if (conn->state != BT_CONNECTED)
+ return false;
+
+ return true;
+}
+
+/* This function requires the caller holds hdev->lock */
+static int hci_explicit_conn_params_set(struct hci_dev *hdev,
+ bdaddr_t *addr, u8 addr_type)
+{
+ struct hci_conn_params *params;
+
+ if (is_connected(hdev, addr, addr_type))
+ return -EISCONN;
+
+ params = hci_conn_params_lookup(hdev, addr, addr_type);
+ if (!params) {
+ params = hci_conn_params_add(hdev, addr, addr_type);
+ if (!params)
+ return -ENOMEM;
+
+ /* If we created new params, mark them to be deleted in
+ * hci_connect_le_scan_cleanup. It's different case than
+ * existing disabled params, those will stay after cleanup.
+ */
+ params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
+ }
+
+ /* We're trying to connect, so make sure params are at pend_le_conns */
+ if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
+ params->auto_connect == HCI_AUTO_CONN_REPORT ||
+ params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
+ hci_pend_le_list_del_init(params);
+ hci_pend_le_list_add(params, &hdev->pend_le_conns);
+ }
+
+ params->explicit_connect = true;
+
+ BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
+ params->auto_connect);
+
+ return 0;
+}
+
+static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
+{
+ struct hci_conn *conn;
+ u8 big;
+
+ /* Allocate a BIG if not set */
+ if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
+ for (big = 0x00; big < 0xef; big++) {
+
+ conn = hci_conn_hash_lookup_big(hdev, big);
+ if (!conn)
+ break;
+ }
+
+ if (big == 0xef)
+ return -EADDRNOTAVAIL;
+
+ /* Update BIG */
+ qos->bcast.big = big;
+ }
+
+ return 0;
+}
+
+static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
+{
+ struct hci_conn *conn;
+ u8 bis;
+
+ /* Allocate BIS if not set */
+ if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
+ /* Find an unused adv set to advertise BIS, skip instance 0x00
+ * since it is reserved as general purpose set.
+ */
+ for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
+ bis++) {
+
+ conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
+ if (!conn)
+ break;
+ }
+
+ if (bis == hdev->le_num_of_adv_sets)
+ return -EADDRNOTAVAIL;
+
+ /* Update BIS */
+ qos->bcast.bis = bis;
+ }
+
+ return 0;
+}
+
+/* This function requires the caller holds hdev->lock */
+static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
+ struct bt_iso_qos *qos, __u8 base_len,
+ __u8 *base)
+{
+ struct hci_conn *conn;
+ int err;
+
+ /* Let's make sure that le is enabled.*/
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
+ if (lmp_le_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ err = qos_set_big(hdev, qos);
+ if (err)
+ return ERR_PTR(err);
+
+ err = qos_set_bis(hdev, qos);
+ if (err)
+ return ERR_PTR(err);
+
+ /* Check if the LE Create BIG command has already been sent */
+ conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
+ qos->bcast.big);
+ if (conn)
+ return ERR_PTR(-EADDRINUSE);
+
+ /* Check BIS settings against other bound BISes, since all
+ * BISes in a BIG must have the same value for all parameters
+ */
+ conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
+
+ if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
+ base_len != conn->le_per_adv_data_len ||
+ memcmp(conn->le_per_adv_data, base, base_len)))
+ return ERR_PTR(-EADDRINUSE);
+
+ conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+
+ conn->state = BT_CONNECT;
+
+ hci_conn_hold(conn);
+ return conn;
+}
+
+/* This function requires the caller holds hdev->lock */
+struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 dst_type, u8 sec_level,
+ u16 conn_timeout,
+ enum conn_reasons conn_reason)
+{
+ struct hci_conn *conn;
+
+ /* Let's make sure that le is enabled.*/
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
+ if (lmp_le_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Some devices send ATT messages as soon as the physical link is
+ * established. To be able to handle these ATT messages, the user-
+ * space first establishes the connection and then starts the pairing
+ * process.
+ *
+ * So if a hci_conn object already exists for the following connection
+ * attempt, we simply update pending_sec_level and auth_type fields
+ * and return the object found.
+ */
+ conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
+ if (conn) {
+ if (conn->pending_sec_level < sec_level)
+ conn->pending_sec_level = sec_level;
+ goto done;
+ }
+
+ BT_DBG("requesting refresh of dst_addr");
+
+ conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+
+ if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
+ hci_conn_del(conn);
+ return ERR_PTR(-EBUSY);
+ }
+
+ conn->state = BT_CONNECT;
+ set_bit(HCI_CONN_SCANNING, &conn->flags);
+ conn->dst_type = dst_type;
+ conn->sec_level = BT_SECURITY_LOW;
+ conn->pending_sec_level = sec_level;
+ conn->conn_timeout = conn_timeout;
+ conn->conn_reason = conn_reason;
+
+ hci_update_passive_scan(hdev);
+
+done:
+ hci_conn_hold(conn);
+ return conn;
+}
+
+struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 sec_level, u8 auth_type,
+ enum conn_reasons conn_reason)
+{
+ struct hci_conn *acl;
+
+ if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
+ if (lmp_bredr_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Reject outgoing connection to device with same BD ADDR against
+ * CVE-2020-26555
+ */
+ if (!bacmp(&hdev->bdaddr, dst)) {
+ bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
+ dst);
+ return ERR_PTR(-ECONNREFUSED);
+ }
+
+ acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
+ if (!acl) {
+ acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ }
+
+ hci_conn_hold(acl);
+
+ acl->conn_reason = conn_reason;
+ if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
+ acl->sec_level = BT_SECURITY_LOW;
+ acl->pending_sec_level = sec_level;
+ acl->auth_type = auth_type;
+ hci_acl_create_connection(acl);
+ }
+
+ return acl;
+}
+
+static struct hci_link *hci_conn_link(struct hci_conn *parent,
+ struct hci_conn *conn)
+{
+ struct hci_dev *hdev = parent->hdev;
+ struct hci_link *link;
+
+ bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
+
+ if (conn->link)
+ return conn->link;
+
+ if (conn->parent)
+ return NULL;
+
+ link = kzalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return NULL;
+
+ link->conn = hci_conn_hold(conn);
+ conn->link = link;
+ conn->parent = hci_conn_get(parent);
+
+ /* Use list_add_tail_rcu append to the list */
+ list_add_tail_rcu(&link->list, &parent->link_list);
+
+ return link;
+}
+
+struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
+ __u16 setting, struct bt_codec *codec)
+{
+ struct hci_conn *acl;
+ struct hci_conn *sco;
+ struct hci_link *link;
+
+ acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
+ CONN_REASON_SCO_CONNECT);
+ if (IS_ERR(acl))
+ return acl;
+
+ sco = hci_conn_hash_lookup_ba(hdev, type, dst);
+ if (!sco) {
+ sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
+ if (!sco) {
+ hci_conn_drop(acl);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
+ link = hci_conn_link(acl, sco);
+ if (!link) {
+ hci_conn_drop(acl);
+ hci_conn_drop(sco);
+ return ERR_PTR(-ENOLINK);
+ }
+
+ sco->setting = setting;
+ sco->codec = *codec;
+
+ if (acl->state == BT_CONNECTED &&
+ (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
+ set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
+ hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
+
+ if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
+ /* defer SCO setup until mode change completed */
+ set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
+ return sco;
+ }
+
+ hci_sco_setup(acl, 0x00);
+ }
+
+ return sco;
+}
+
+static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_le_create_big cp;
+ struct iso_list_data data;
+
+ memset(&cp, 0, sizeof(cp));
+
+ data.big = qos->bcast.big;
+ data.bis = qos->bcast.bis;
+ data.count = 0;
+
+ /* Create a BIS for each bound connection */
+ hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
+ BT_BOUND, &data);
+
+ cp.handle = qos->bcast.big;
+ cp.adv_handle = qos->bcast.bis;
+ cp.num_bis = data.count;
+ hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
+ cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
+ cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
+ cp.bis.rtn = qos->bcast.out.rtn;
+ cp.bis.phy = qos->bcast.out.phy;
+ cp.bis.packing = qos->bcast.packing;
+ cp.bis.framing = qos->bcast.framing;
+ cp.bis.encryption = qos->bcast.encryption;
+ memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
+
+ return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
+}
+
+static int set_cig_params_sync(struct hci_dev *hdev, void *data)
+{
+ u8 cig_id = PTR_UINT(data);
+ struct hci_conn *conn;
+ struct bt_iso_qos *qos;
+ struct iso_cig_params pdu;
+ u8 cis_id;
+
+ conn = hci_conn_hash_lookup_cig(hdev, cig_id);
+ if (!conn)
+ return 0;
+
+ memset(&pdu, 0, sizeof(pdu));
+
+ qos = &conn->iso_qos;
+ pdu.cp.cig_id = cig_id;
+ hci_cpu_to_le24(qos->ucast.out.interval, pdu.cp.c_interval);
+ hci_cpu_to_le24(qos->ucast.in.interval, pdu.cp.p_interval);
+ pdu.cp.sca = qos->ucast.sca;
+ pdu.cp.packing = qos->ucast.packing;
+ pdu.cp.framing = qos->ucast.framing;
+ pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency);
+ pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency);
+
+ /* Reprogram all CIS(s) with the same CIG, valid range are:
+ * num_cis: 0x00 to 0x1F
+ * cis_id: 0x00 to 0xEF
+ */
+ for (cis_id = 0x00; cis_id < 0xf0 &&
+ pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) {
+ struct hci_cis_params *cis;
+
+ conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
+ if (!conn)
+ continue;
+
+ qos = &conn->iso_qos;
+
+ cis = &pdu.cis[pdu.cp.num_cis++];
+ cis->cis_id = cis_id;
+ cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
+ cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
+ cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
+ qos->ucast.in.phy;
+ cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
+ qos->ucast.out.phy;
+ cis->c_rtn = qos->ucast.out.rtn;
+ cis->p_rtn = qos->ucast.in.rtn;
+ }
+
+ if (!pdu.cp.num_cis)
+ return 0;
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
+ sizeof(pdu.cp) +
+ pdu.cp.num_cis * sizeof(pdu.cis[0]), &pdu,
+ HCI_CMD_TIMEOUT);
+}
+
+static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct iso_list_data data;
+
+ memset(&data, 0, sizeof(data));
+
+ /* Allocate first still reconfigurable CIG if not set */
+ if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
+ for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
+ data.count = 0;
+
+ hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
+ BT_CONNECT, &data);
+ if (data.count)
+ continue;
+
+ hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
+ BT_CONNECTED, &data);
+ if (!data.count)
+ break;
+ }
+
+ if (data.cig == 0xf0)
+ return false;
+
+ /* Update CIG */
+ qos->ucast.cig = data.cig;
+ }
+
+ if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
+ if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
+ qos->ucast.cis))
+ return false;
+ goto done;
+ }
+
+ /* Allocate first available CIS if not set */
+ for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
+ data.cis++) {
+ if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
+ data.cis)) {
+ /* Update CIS */
+ qos->ucast.cis = data.cis;
+ break;
+ }
+ }
+
+ if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
+ return false;
+
+done:
+ if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
+ UINT_PTR(qos->ucast.cig), NULL) < 0)
+ return false;
+
+ return true;
+}
+
+struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
+ __u8 dst_type, struct bt_iso_qos *qos)
+{
+ struct hci_conn *cis;
+
+ cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
+ qos->ucast.cis);
+ if (!cis) {
+ cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
+ if (!cis)
+ return ERR_PTR(-ENOMEM);
+ cis->cleanup = cis_cleanup;
+ cis->dst_type = dst_type;
+ cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
+ cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
+ }
+
+ if (cis->state == BT_CONNECTED)
+ return cis;
+
+ /* Check if CIS has been set and the settings matches */
+ if (cis->state == BT_BOUND &&
+ !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
+ return cis;
+
+ /* Update LINK PHYs according to QoS preference */
+ cis->le_tx_phy = qos->ucast.out.phy;
+ cis->le_rx_phy = qos->ucast.in.phy;
+
+ /* If output interval is not set use the input interval as it cannot be
+ * 0x000000.
+ */
+ if (!qos->ucast.out.interval)
+ qos->ucast.out.interval = qos->ucast.in.interval;
+
+ /* If input interval is not set use the output interval as it cannot be
+ * 0x000000.
+ */
+ if (!qos->ucast.in.interval)
+ qos->ucast.in.interval = qos->ucast.out.interval;
+
+ /* If output latency is not set use the input latency as it cannot be
+ * 0x0000.
+ */
+ if (!qos->ucast.out.latency)
+ qos->ucast.out.latency = qos->ucast.in.latency;
+
+ /* If input latency is not set use the output latency as it cannot be
+ * 0x0000.
+ */
+ if (!qos->ucast.in.latency)
+ qos->ucast.in.latency = qos->ucast.out.latency;
+
+ if (!hci_le_set_cig_params(cis, qos)) {
+ hci_conn_drop(cis);
+ return ERR_PTR(-EINVAL);
+ }
+
+ hci_conn_hold(cis);
+
+ cis->iso_qos = *qos;
+ cis->state = BT_BOUND;
+
+ return cis;
+}
+
+bool hci_iso_setup_path(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_le_setup_iso_path cmd;
+
+ memset(&cmd, 0, sizeof(cmd));
+
+ if (conn->iso_qos.ucast.out.sdu) {
+ cmd.handle = cpu_to_le16(conn->handle);
+ cmd.direction = 0x00; /* Input (Host to Controller) */
+ cmd.path = 0x00; /* HCI path if enabled */
+ cmd.codec = 0x03; /* Transparent Data */
+
+ if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
+ &cmd) < 0)
+ return false;
+ }
+
+ if (conn->iso_qos.ucast.in.sdu) {
+ cmd.handle = cpu_to_le16(conn->handle);
+ cmd.direction = 0x01; /* Output (Controller to Host) */
+ cmd.path = 0x00; /* HCI path if enabled */
+ cmd.codec = 0x03; /* Transparent Data */
+
+ if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
+ &cmd) < 0)
+ return false;
+ }
+
+ return true;
+}
+
+int hci_conn_check_create_cis(struct hci_conn *conn)
+{
+ if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY))
+ return -EINVAL;
+
+ if (!conn->parent || conn->parent->state != BT_CONNECTED ||
+ conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
+ return 1;
+
+ return 0;
+}
+
+static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
+{
+ return hci_le_create_cis_sync(hdev);
+}
+
+int hci_le_create_cis_pending(struct hci_dev *hdev)
+{
+ struct hci_conn *conn;
+ bool pending = false;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
+ if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
+ rcu_read_unlock();
+ return -EBUSY;
+ }
+
+ if (!hci_conn_check_create_cis(conn))
+ pending = true;
+ }
+
+ rcu_read_unlock();
+
+ if (!pending)
+ return 0;
+
+ /* Queue Create CIS */
+ return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
+}
+
+static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
+ struct bt_iso_io_qos *qos, __u8 phy)
+{
+ /* Only set MTU if PHY is enabled */
+ if (!qos->sdu && qos->phy) {
+ if (hdev->iso_mtu > 0)
+ qos->sdu = hdev->iso_mtu;
+ else if (hdev->le_mtu > 0)
+ qos->sdu = hdev->le_mtu;
+ else
+ qos->sdu = hdev->acl_mtu;
+ }
+
+ /* Use the same PHY as ACL if set to any */
+ if (qos->phy == BT_ISO_PHY_ANY)
+ qos->phy = phy;
+
+ /* Use LE ACL connection interval if not set */
+ if (!qos->interval)
+ /* ACL interval unit in 1.25 ms to us */
+ qos->interval = conn->le_conn_interval * 1250;
+
+ /* Use LE ACL connection latency if not set */
+ if (!qos->latency)
+ qos->latency = conn->le_conn_latency;
+}
+
+static int create_big_sync(struct hci_dev *hdev, void *data)
+{
+ struct hci_conn *conn = data;
+ struct bt_iso_qos *qos = &conn->iso_qos;
+ u16 interval, sync_interval = 0;
+ u32 flags = 0;
+ int err;
+
+ if (qos->bcast.out.phy == 0x02)
+ flags |= MGMT_ADV_FLAG_SEC_2M;
+
+ /* Align intervals */
+ interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
+
+ if (qos->bcast.bis)
+ sync_interval = interval * 4;
+
+ err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
+ conn->le_per_adv_data, flags, interval,
+ interval, sync_interval);
+ if (err)
+ return err;
+
+ return hci_le_create_big(conn, &conn->iso_qos);
+}
+
+static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
+{
+ struct hci_cp_le_pa_create_sync *cp = data;
+
+ bt_dev_dbg(hdev, "");
+
+ if (err)
+ bt_dev_err(hdev, "Unable to create PA: %d", err);
+
+ kfree(cp);
+}
+
+static int create_pa_sync(struct hci_dev *hdev, void *data)
+{
+ struct hci_cp_le_pa_create_sync *cp = data;
+ int err;
+
+ err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
+ sizeof(*cp), cp, HCI_CMD_TIMEOUT);
+ if (err) {
+ hci_dev_clear_flag(hdev, HCI_PA_SYNC);
+ return err;
+ }
+
+ return hci_update_passive_scan_sync(hdev);
+}
+
+int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type,
+ __u8 sid, struct bt_iso_qos *qos)
+{
+ struct hci_cp_le_pa_create_sync *cp;
+
+ if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
+ return -EBUSY;
+
+ cp = kzalloc(sizeof(*cp), GFP_KERNEL);
+ if (!cp) {
+ hci_dev_clear_flag(hdev, HCI_PA_SYNC);
+ return -ENOMEM;
+ }
+
+ cp->options = qos->bcast.options;
+ cp->sid = sid;
+ cp->addr_type = dst_type;
+ bacpy(&cp->addr, dst);
+ cp->skip = cpu_to_le16(qos->bcast.skip);
+ cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
+ cp->sync_cte_type = qos->bcast.sync_cte_type;
+
+ /* Queue start pa_create_sync and scan */
+ return hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete);
+}
+
+int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
+ struct bt_iso_qos *qos,
+ __u16 sync_handle, __u8 num_bis, __u8 bis[])
+{
+ struct _packed {
+ struct hci_cp_le_big_create_sync cp;
+ __u8 bis[0x11];
+ } pdu;
+ int err;
+
+ if (num_bis > sizeof(pdu.bis))
+ return -EINVAL;
+
+ err = qos_set_big(hdev, qos);
+ if (err)
+ return err;
+
+ if (hcon)
+ hcon->iso_qos.bcast.big = qos->bcast.big;
+
+ memset(&pdu, 0, sizeof(pdu));
+ pdu.cp.handle = qos->bcast.big;
+ pdu.cp.sync_handle = cpu_to_le16(sync_handle);
+ pdu.cp.encryption = qos->bcast.encryption;
+ memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode));
+ pdu.cp.mse = qos->bcast.mse;
+ pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout);
+ pdu.cp.num_bis = num_bis;
+ memcpy(pdu.bis, bis, num_bis);
+
+ return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
+ sizeof(pdu.cp) + num_bis, &pdu);
+}
+
+static void create_big_complete(struct hci_dev *hdev, void *data, int err)
+{
+ struct hci_conn *conn = data;
+
+ bt_dev_dbg(hdev, "conn %p", conn);
+
+ if (err) {
+ bt_dev_err(hdev, "Unable to create BIG: %d", err);
+ hci_connect_cfm(conn, err);
+ hci_conn_del(conn);
+ }
+}
+
+struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
+ struct bt_iso_qos *qos,
+ __u8 base_len, __u8 *base)
+{
+ struct hci_conn *conn;
+ __u8 eir[HCI_MAX_PER_AD_LENGTH];
+
+ if (base_len && base)
+ base_len = eir_append_service_data(eir, 0, 0x1851,
+ base, base_len);
+
+ /* We need hci_conn object using the BDADDR_ANY as dst */
+ conn = hci_add_bis(hdev, dst, qos, base_len, eir);
+ if (IS_ERR(conn))
+ return conn;
+
+ /* Update LINK PHYs according to QoS preference */
+ conn->le_tx_phy = qos->bcast.out.phy;
+ conn->le_tx_phy = qos->bcast.out.phy;
+
+ /* Add Basic Announcement into Peridic Adv Data if BASE is set */
+ if (base_len && base) {
+ memcpy(conn->le_per_adv_data, eir, sizeof(eir));
+ conn->le_per_adv_data_len = base_len;
+ }
+
+ hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
+ conn->le_tx_phy ? conn->le_tx_phy :
+ hdev->le_tx_def_phys);
+
+ conn->iso_qos = *qos;
+ conn->state = BT_BOUND;
+
+ return conn;
+}
+
+static void bis_mark_per_adv(struct hci_conn *conn, void *data)
+{
+ struct iso_list_data *d = data;
+
+ /* Skip if not broadcast/ANY address */
+ if (bacmp(&conn->dst, BDADDR_ANY))
+ return;
+
+ if (d->big != conn->iso_qos.bcast.big ||
+ d->bis == BT_ISO_QOS_BIS_UNSET ||
+ d->bis != conn->iso_qos.bcast.bis)
+ return;
+
+ set_bit(HCI_CONN_PER_ADV, &conn->flags);
+}
+
+struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
+ __u8 dst_type, struct bt_iso_qos *qos,
+ __u8 base_len, __u8 *base)
+{
+ struct hci_conn *conn;
+ int err;
+ struct iso_list_data data;
+
+ conn = hci_bind_bis(hdev, dst, qos, base_len, base);
+ if (IS_ERR(conn))
+ return conn;
+
+ data.big = qos->bcast.big;
+ data.bis = qos->bcast.bis;
+
+ /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
+ * the start periodic advertising and create BIG commands have
+ * been queued
+ */
+ hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK,
+ BT_BOUND, &data);
+
+ /* Queue start periodic advertising and create BIG */
+ err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
+ create_big_complete);
+ if (err < 0) {
+ hci_conn_drop(conn);
+ return ERR_PTR(err);
+ }
+
+ return conn;
+}
+
+struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
+ __u8 dst_type, struct bt_iso_qos *qos)
+{
+ struct hci_conn *le;
+ struct hci_conn *cis;
+ struct hci_link *link;
+
+ if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
+ le = hci_connect_le(hdev, dst, dst_type, false,
+ BT_SECURITY_LOW,
+ HCI_LE_CONN_TIMEOUT,
+ HCI_ROLE_SLAVE);
+ else
+ le = hci_connect_le_scan(hdev, dst, dst_type,
+ BT_SECURITY_LOW,
+ HCI_LE_CONN_TIMEOUT,
+ CONN_REASON_ISO_CONNECT);
+ if (IS_ERR(le))
+ return le;
+
+ hci_iso_qos_setup(hdev, le, &qos->ucast.out,
+ le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
+ hci_iso_qos_setup(hdev, le, &qos->ucast.in,
+ le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
+
+ cis = hci_bind_cis(hdev, dst, dst_type, qos);
+ if (IS_ERR(cis)) {
+ hci_conn_drop(le);
+ return cis;
+ }
+
+ link = hci_conn_link(le, cis);
+ if (!link) {
+ hci_conn_drop(le);
+ hci_conn_drop(cis);
+ return ERR_PTR(-ENOLINK);
+ }
+
+ /* Link takes the refcount */
+ hci_conn_drop(cis);
+
+ cis->state = BT_CONNECT;
+
+ hci_le_create_cis_pending(hdev);
+
+ return cis;
+}
+
+/* Check link security requirement */
+int hci_conn_check_link_mode(struct hci_conn *conn)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* In Secure Connections Only mode, it is required that Secure
+ * Connections is used and the link is encrypted with AES-CCM
+ * using a P-256 authenticated combination key.
+ */
+ if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
+ if (!hci_conn_sc_enabled(conn) ||
+ !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
+ conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
+ return 0;
+ }
+
+ /* AES encryption is required for Level 4:
+ *
+ * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
+ * page 1319:
+ *
+ * 128-bit equivalent strength for link and encryption keys
+ * required using FIPS approved algorithms (E0 not allowed,
+ * SAFER+ not allowed, and P-192 not allowed; encryption key
+ * not shortened)
+ */
+ if (conn->sec_level == BT_SECURITY_FIPS &&
+ !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
+ bt_dev_err(conn->hdev,
+ "Invalid security: Missing AES-CCM usage");
+ return 0;
+ }
+
+ if (hci_conn_ssp_enabled(conn) &&
+ !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ return 0;
+
+ return 1;
+}
+
+/* Authenticate remote device */
+static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (conn->pending_sec_level > sec_level)
+ sec_level = conn->pending_sec_level;
+
+ if (sec_level > conn->sec_level)
+ conn->pending_sec_level = sec_level;
+ else if (test_bit(HCI_CONN_AUTH, &conn->flags))
+ return 1;
+
+ /* Make sure we preserve an existing MITM requirement*/
+ auth_type |= (conn->auth_type & 0x01);
+
+ conn->auth_type = auth_type;
+
+ if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
+ struct hci_cp_auth_requested cp;
+
+ cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
+ sizeof(cp), &cp);
+
+ /* Set the ENCRYPT_PEND to trigger encryption after
+ * authentication.
+ */
+ if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
+ }
+
+ return 0;
+}
+
+/* Encrypt the link */
+static void hci_conn_encrypt(struct hci_conn *conn)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
+ struct hci_cp_set_conn_encrypt cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.encrypt = 0x01;
+ hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
+ &cp);
+ }
+}
+
+/* Enable security */
+int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
+ bool initiator)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (conn->type == LE_LINK)
+ return smp_conn_security(conn, sec_level);
+
+ /* For sdp we don't need the link key. */
+ if (sec_level == BT_SECURITY_SDP)
+ return 1;
+
+ /* For non 2.1 devices and low security level we don't need the link
+ key. */
+ if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
+ return 1;
+
+ /* For other security levels we need the link key. */
+ if (!test_bit(HCI_CONN_AUTH, &conn->flags))
+ goto auth;
+
+ switch (conn->key_type) {
+ case HCI_LK_AUTH_COMBINATION_P256:
+ /* An authenticated FIPS approved combination key has
+ * sufficient security for security level 4 or lower.
+ */
+ if (sec_level <= BT_SECURITY_FIPS)
+ goto encrypt;
+ break;
+ case HCI_LK_AUTH_COMBINATION_P192:
+ /* An authenticated combination key has sufficient security for
+ * security level 3 or lower.
+ */
+ if (sec_level <= BT_SECURITY_HIGH)
+ goto encrypt;
+ break;
+ case HCI_LK_UNAUTH_COMBINATION_P192:
+ case HCI_LK_UNAUTH_COMBINATION_P256:
+ /* An unauthenticated combination key has sufficient security
+ * for security level 2 or lower.
+ */
+ if (sec_level <= BT_SECURITY_MEDIUM)
+ goto encrypt;
+ break;
+ case HCI_LK_COMBINATION:
+ /* A combination key has always sufficient security for the
+ * security levels 2 or lower. High security level requires the
+ * combination key is generated using maximum PIN code length
+ * (16). For pre 2.1 units.
+ */
+ if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
+ goto encrypt;
+ break;
+ default:
+ break;
+ }
+
+auth:
+ if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
+ return 0;
+
+ if (initiator)
+ set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
+
+ if (!hci_conn_auth(conn, sec_level, auth_type))
+ return 0;
+
+encrypt:
+ if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
+ /* Ensure that the encryption key size has been read,
+ * otherwise stall the upper layer responses.
+ */
+ if (!conn->enc_key_size)
+ return 0;
+
+ /* Nothing else needed, all requirements are met */
+ return 1;
+ }
+
+ hci_conn_encrypt(conn);
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_security);
+
+/* Check secure link requirement */
+int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* Accept if non-secure or higher security level is required */
+ if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
+ return 1;
+
+ /* Accept if secure or higher security level is already present */
+ if (conn->sec_level == BT_SECURITY_HIGH ||
+ conn->sec_level == BT_SECURITY_FIPS)
+ return 1;
+
+ /* Reject not secure link */
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_check_secure);
+
+/* Switch role */
+int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (role == conn->role)
+ return 1;
+
+ if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
+ struct hci_cp_switch_role cp;
+ bacpy(&cp.bdaddr, &conn->dst);
+ cp.role = role;
+ hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_switch_role);
+
+/* Enter active mode */
+void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("hcon %p mode %d", conn, conn->mode);
+
+ if (conn->mode != HCI_CM_SNIFF)
+ goto timer;
+
+ if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
+ goto timer;
+
+ if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
+ struct hci_cp_exit_sniff_mode cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
+ }
+
+timer:
+ if (hdev->idle_timeout > 0)
+ queue_delayed_work(hdev->workqueue, &conn->idle_work,
+ msecs_to_jiffies(hdev->idle_timeout));
+}
+
+/* Drop all connection on the device */
+void hci_conn_hash_flush(struct hci_dev *hdev)
+{
+ struct list_head *head = &hdev->conn_hash.list;
+ struct hci_conn *conn;
+
+ BT_DBG("hdev %s", hdev->name);
+
+ /* We should not traverse the list here, because hci_conn_del
+ * can remove extra links, which may cause the list traversal
+ * to hit items that have already been released.
+ */
+ while ((conn = list_first_entry_or_null(head,
+ struct hci_conn,
+ list)) != NULL) {
+ conn->state = BT_CLOSED;
+ hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
+ hci_conn_del(conn);
+ }
+}
+
+/* Check pending connect attempts */
+void hci_conn_check_pending(struct hci_dev *hdev)
+{
+ struct hci_conn *conn;
+
+ BT_DBG("hdev %s", hdev->name);
+
+ hci_dev_lock(hdev);
+
+ conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
+ if (conn)
+ hci_acl_create_connection(conn);
+
+ hci_dev_unlock(hdev);
+}
+
+static u32 get_link_mode(struct hci_conn *conn)
+{
+ u32 link_mode = 0;
+
+ if (conn->role == HCI_ROLE_MASTER)
+ link_mode |= HCI_LM_MASTER;
+
+ if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ link_mode |= HCI_LM_ENCRYPT;
+
+ if (test_bit(HCI_CONN_AUTH, &conn->flags))
+ link_mode |= HCI_LM_AUTH;
+
+ if (test_bit(HCI_CONN_SECURE, &conn->flags))
+ link_mode |= HCI_LM_SECURE;
+
+ if (test_bit(HCI_CONN_FIPS, &conn->flags))
+ link_mode |= HCI_LM_FIPS;
+
+ return link_mode;
+}
+
+int hci_get_conn_list(void __user *arg)
+{
+ struct hci_conn *c;
+ struct hci_conn_list_req req, *cl;
+ struct hci_conn_info *ci;
+ struct hci_dev *hdev;
+ int n = 0, size, err;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
+ return -EINVAL;
+
+ size = sizeof(req) + req.conn_num * sizeof(*ci);
+
+ cl = kmalloc(size, GFP_KERNEL);
+ if (!cl)
+ return -ENOMEM;
+
+ hdev = hci_dev_get(req.dev_id);
+ if (!hdev) {
+ kfree(cl);
+ return -ENODEV;
+ }
+
+ ci = cl->conn_info;
+
+ hci_dev_lock(hdev);
+ list_for_each_entry(c, &hdev->conn_hash.list, list) {
+ bacpy(&(ci + n)->bdaddr, &c->dst);
+ (ci + n)->handle = c->handle;
+ (ci + n)->type = c->type;
+ (ci + n)->out = c->out;
+ (ci + n)->state = c->state;
+ (ci + n)->link_mode = get_link_mode(c);
+ if (++n >= req.conn_num)
+ break;
+ }
+ hci_dev_unlock(hdev);
+
+ cl->dev_id = hdev->id;
+ cl->conn_num = n;
+ size = sizeof(req) + n * sizeof(*ci);
+
+ hci_dev_put(hdev);
+
+ err = copy_to_user(arg, cl, size);
+ kfree(cl);
+
+ return err ? -EFAULT : 0;
+}
+
+int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
+{
+ struct hci_conn_info_req req;
+ struct hci_conn_info ci;
+ struct hci_conn *conn;
+ char __user *ptr = arg + sizeof(req);
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ hci_dev_lock(hdev);
+ conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
+ if (conn) {
+ bacpy(&ci.bdaddr, &conn->dst);
+ ci.handle = conn->handle;
+ ci.type = conn->type;
+ ci.out = conn->out;
+ ci.state = conn->state;
+ ci.link_mode = get_link_mode(conn);
+ }
+ hci_dev_unlock(hdev);
+
+ if (!conn)
+ return -ENOENT;
+
+ return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
+}
+
+int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
+{
+ struct hci_auth_info_req req;
+ struct hci_conn *conn;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ hci_dev_lock(hdev);
+ conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
+ if (conn)
+ req.type = conn->auth_type;
+ hci_dev_unlock(hdev);
+
+ if (!conn)
+ return -ENOENT;
+
+ return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
+}
+
+struct hci_chan *hci_chan_create(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_chan *chan;
+
+ BT_DBG("%s hcon %p", hdev->name, conn);
+
+ if (test_bit(HCI_CONN_DROP, &conn->flags)) {
+ BT_DBG("Refusing to create new hci_chan");
+ return NULL;
+ }
+
+ chan = kzalloc(sizeof(*chan), GFP_KERNEL);
+ if (!chan)
+ return NULL;
+
+ chan->conn = hci_conn_get(conn);
+ skb_queue_head_init(&chan->data_q);
+ chan->state = BT_CONNECTED;
+
+ list_add_rcu(&chan->list, &conn->chan_list);
+
+ return chan;
+}
+
+void hci_chan_del(struct hci_chan *chan)
+{
+ struct hci_conn *conn = chan->conn;
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
+
+ list_del_rcu(&chan->list);
+
+ synchronize_rcu();
+
+ /* Prevent new hci_chan's to be created for this hci_conn */
+ set_bit(HCI_CONN_DROP, &conn->flags);
+
+ hci_conn_put(conn);
+
+ skb_queue_purge(&chan->data_q);
+ kfree(chan);
+}
+
+void hci_chan_list_flush(struct hci_conn *conn)
+{
+ struct hci_chan *chan, *n;
+
+ BT_DBG("hcon %p", conn);
+
+ list_for_each_entry_safe(chan, n, &conn->chan_list, list)
+ hci_chan_del(chan);
+}
+
+static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
+ __u16 handle)
+{
+ struct hci_chan *hchan;
+
+ list_for_each_entry(hchan, &hcon->chan_list, list) {
+ if (hchan->handle == handle)
+ return hchan;
+ }
+
+ return NULL;
+}
+
+struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
+{
+ struct hci_conn_hash *h = &hdev->conn_hash;
+ struct hci_conn *hcon;
+ struct hci_chan *hchan = NULL;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(hcon, &h->list, list) {
+ hchan = __hci_chan_lookup_handle(hcon, handle);
+ if (hchan)
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return hchan;
+}
+
+u32 hci_conn_get_phy(struct hci_conn *conn)
+{
+ u32 phys = 0;
+
+ /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
+ * Table 6.2: Packets defined for synchronous, asynchronous, and
+ * CPB logical transport types.
+ */
+ switch (conn->type) {
+ case SCO_LINK:
+ /* SCO logical transport (1 Mb/s):
+ * HV1, HV2, HV3 and DV.
+ */
+ phys |= BT_PHY_BR_1M_1SLOT;
+
+ break;
+
+ case ACL_LINK:
+ /* ACL logical transport (1 Mb/s) ptt=0:
+ * DH1, DM3, DH3, DM5 and DH5.
+ */
+ phys |= BT_PHY_BR_1M_1SLOT;
+
+ if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
+ phys |= BT_PHY_BR_1M_3SLOT;
+
+ if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
+ phys |= BT_PHY_BR_1M_5SLOT;
+
+ /* ACL logical transport (2 Mb/s) ptt=1:
+ * 2-DH1, 2-DH3 and 2-DH5.
+ */
+ if (!(conn->pkt_type & HCI_2DH1))
+ phys |= BT_PHY_EDR_2M_1SLOT;
+
+ if (!(conn->pkt_type & HCI_2DH3))
+ phys |= BT_PHY_EDR_2M_3SLOT;
+
+ if (!(conn->pkt_type & HCI_2DH5))
+ phys |= BT_PHY_EDR_2M_5SLOT;
+
+ /* ACL logical transport (3 Mb/s) ptt=1:
+ * 3-DH1, 3-DH3 and 3-DH5.
+ */
+ if (!(conn->pkt_type & HCI_3DH1))
+ phys |= BT_PHY_EDR_3M_1SLOT;
+
+ if (!(conn->pkt_type & HCI_3DH3))
+ phys |= BT_PHY_EDR_3M_3SLOT;
+
+ if (!(conn->pkt_type & HCI_3DH5))
+ phys |= BT_PHY_EDR_3M_5SLOT;
+
+ break;
+
+ case ESCO_LINK:
+ /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
+ phys |= BT_PHY_BR_1M_1SLOT;
+
+ if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
+ phys |= BT_PHY_BR_1M_3SLOT;
+
+ /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
+ if (!(conn->pkt_type & ESCO_2EV3))
+ phys |= BT_PHY_EDR_2M_1SLOT;
+
+ if (!(conn->pkt_type & ESCO_2EV5))
+ phys |= BT_PHY_EDR_2M_3SLOT;
+
+ /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
+ if (!(conn->pkt_type & ESCO_3EV3))
+ phys |= BT_PHY_EDR_3M_1SLOT;
+
+ if (!(conn->pkt_type & ESCO_3EV5))
+ phys |= BT_PHY_EDR_3M_3SLOT;
+
+ break;
+
+ case LE_LINK:
+ if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
+ phys |= BT_PHY_LE_1M_TX;
+
+ if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
+ phys |= BT_PHY_LE_1M_RX;
+
+ if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
+ phys |= BT_PHY_LE_2M_TX;
+
+ if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
+ phys |= BT_PHY_LE_2M_RX;
+
+ if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
+ phys |= BT_PHY_LE_CODED_TX;
+
+ if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
+ phys |= BT_PHY_LE_CODED_RX;
+
+ break;
+ }
+
+ return phys;
+}
+
+static int abort_conn_sync(struct hci_dev *hdev, void *data)
+{
+ struct hci_conn *conn;
+ u16 handle = PTR_UINT(data);
+
+ conn = hci_conn_hash_lookup_handle(hdev, handle);
+ if (!conn)
+ return 0;
+
+ return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
+}
+
+int hci_abort_conn(struct hci_conn *conn, u8 reason)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ /* If abort_reason has already been set it means the connection is
+ * already being aborted so don't attempt to overwrite it.
+ */
+ if (conn->abort_reason)
+ return 0;
+
+ bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
+
+ conn->abort_reason = reason;
+
+ /* If the connection is pending check the command opcode since that
+ * might be blocking on hci_cmd_sync_work while waiting its respective
+ * event so we need to hci_cmd_sync_cancel to cancel it.
+ *
+ * hci_connect_le serializes the connection attempts so only one
+ * connection can be in BT_CONNECT at time.
+ */
+ if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
+ switch (hci_skb_event(hdev->sent_cmd)) {
+ case HCI_EV_LE_CONN_COMPLETE:
+ case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
+ case HCI_EVT_LE_CIS_ESTABLISHED:
+ hci_cmd_sync_cancel(hdev, -ECANCELED);
+ break;
+ }
+ }
+
+ return hci_cmd_sync_queue(hdev, abort_conn_sync, UINT_PTR(conn->handle),
+ NULL);
+}