diff options
Diffstat (limited to 'net/bluetooth/hci_conn.c')
| -rw-r--r-- | net/bluetooth/hci_conn.c | 1903 |
1 files changed, 1903 insertions, 0 deletions
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c new file mode 100644 index 000000000..52e512f41 --- /dev/null +++ b/net/bluetooth/hci_conn.c @@ -0,0 +1,1903 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. + + 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 "hci_request.h" +#include "smp.h" +#include "a2mp.h" + +struct sco_param { + u16 pkt_type; + u16 max_latency; + u8 retrans_effort; +}; + +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) +{ + 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 || !params->explicit_connect) + return; + + /* 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; + + list_del_init(¶ms->action); + + 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: + list_add(¶ms->action, &hdev->pend_le_conns); + break; + case HCI_AUTO_CONN_REPORT: + list_add(¶ms->action, &hdev->pend_le_reports); + break; + default: + break; + } + + hci_update_background_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); + + hci_chan_list_flush(conn); + + hci_conn_hash_del(hdev, 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 le_scan_cleanup(struct work_struct *work) +{ + struct hci_conn *conn = container_of(work, struct hci_conn, + le_scan_cleanup); + struct hci_dev *hdev = conn->hdev; + struct hci_conn *c = NULL; + + BT_DBG("%s hcon %p", hdev->name, conn); + + hci_dev_lock(hdev); + + /* Check that the hci_conn is still around */ + rcu_read_lock(); + list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) { + if (c == conn) + break; + } + rcu_read_unlock(); + + if (c == conn) { + hci_connect_le_scan_cleanup(conn); + hci_conn_cleanup(conn); + } + + hci_dev_unlock(hdev); + hci_dev_put(hdev); + hci_conn_put(conn); +} + +static void hci_connect_le_scan_remove(struct hci_conn *conn) +{ + BT_DBG("%s hcon %p", conn->hdev->name, conn); + + /* We can't call hci_conn_del/hci_conn_cleanup here since that + * could deadlock with another hci_conn_del() call that's holding + * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work). + * Instead, grab temporary extra references to the hci_dev and + * hci_conn and perform the necessary cleanup in a separate work + * callback. + */ + + hci_dev_hold(conn->hdev); + hci_conn_get(conn); + + /* Even though we hold a reference to the hdev, many other + * things might get cleaned up meanwhile, including the hdev's + * own workqueue, so we can't use that for scheduling. + */ + schedule_work(&conn->le_scan_cleanup); +} + +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); + + 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); +} + +bool hci_setup_sync(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_DBG("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 (conn->attempt > ARRAY_SIZE(esco_param_msbc)) + return false; + param = &esco_param_msbc[conn->attempt - 1]; + break; + case SCO_AIRMODE_CVSD: + if (lmp_esco_capable(conn->link)) { + if (conn->attempt > 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; +} + +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_conn *sco = conn->link; + + if (!sco) + return; + + BT_DBG("hcon %p", conn); + + if (!status) { + if (lmp_esco_capable(conn->hdev)) + hci_setup_sync(sco, conn->handle); + else + hci_add_sco(sco, conn->handle); + } else { + hci_connect_cfm(sco, status); + hci_conn_del(sco); + } +} + +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; + + /* LE connections in scanning state need special handling */ + if (conn->state == BT_CONNECT && conn->type == LE_LINK && + test_bit(HCI_CONN_SCANNING, &conn->flags)) { + hci_connect_le_scan_remove(conn); + 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_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); + hci_dev_unlock(hdev); + return; + } + + hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); +} + +struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, + u8 role) +{ + struct hci_conn *conn; + + BT_DBG("%s dst %pMR", hdev->name, dst); + + conn = kzalloc(sizeof(*conn), GFP_KERNEL); + if (!conn) + return NULL; + + bacpy(&conn->dst, dst); + bacpy(&conn->src, &hdev->bdaddr); + 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; + + 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 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_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); + INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup); + + 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; +} + +int 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); + + 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) { + struct hci_conn *sco = conn->link; + if (sco) + sco->link = NULL; + + /* 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 { + struct hci_conn *acl = conn->link; + if (acl) { + acl->link = NULL; + hci_conn_drop(acl); + } + } + + 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); + + return 0; +} + +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 */ +void hci_le_conn_failed(struct hci_conn *conn, u8 status) +{ + struct hci_dev *hdev = conn->hdev; + struct hci_conn_params *params; + + params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst, + conn->dst_type); + if (params && params->conn) { + hci_conn_drop(params->conn); + hci_conn_put(params->conn); + params->conn = NULL; + } + + conn->state = BT_CLOSED; + + /* If the status indicates successful cancellation of + * the attempt (i.e. Unkown 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 != HCI_ERROR_UNKNOWN_CONN_ID || + (params && params->explicit_connect)) + mgmt_connect_failed(hdev, &conn->dst, conn->type, + conn->dst_type, status); + + hci_connect_cfm(conn, status); + + hci_conn_del(conn); + + /* Since we may have temporarily stopped the background scanning in + * favor of connection establishment, we should restart it. + */ + hci_update_background_scan(hdev); + + /* Re-enable advertising in case this was a failed connection + * attempt as a peripheral. + */ + hci_req_reenable_advertising(hdev); +} + +static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode) +{ + struct hci_conn *conn; + + hci_dev_lock(hdev); + + conn = hci_lookup_le_connect(hdev); + + if (!status) { + hci_connect_le_scan_cleanup(conn); + goto done; + } + + bt_dev_err(hdev, "request failed to create LE connection: " + "status 0x%2.2x", status); + + if (!conn) + goto done; + + hci_le_conn_failed(conn, status); + +done: + hci_dev_unlock(hdev); +} + +static bool conn_use_rpa(struct hci_conn *conn) +{ + struct hci_dev *hdev = conn->hdev; + + return hci_dev_test_flag(hdev, HCI_PRIVACY); +} + +static void set_ext_conn_params(struct hci_conn *conn, + struct hci_cp_le_ext_conn_param *p) +{ + struct hci_dev *hdev = conn->hdev; + + memset(p, 0, sizeof(*p)); + + p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect); + p->scan_window = cpu_to_le16(hdev->le_scan_window_connect); + p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval); + p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval); + p->conn_latency = cpu_to_le16(conn->le_conn_latency); + p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout); + p->min_ce_len = cpu_to_le16(0x0000); + p->max_ce_len = cpu_to_le16(0x0000); +} + +static void hci_req_add_le_create_conn(struct hci_request *req, + struct hci_conn *conn, + bdaddr_t *direct_rpa) +{ + struct hci_dev *hdev = conn->hdev; + u8 own_addr_type; + + /* If direct address was provided we use it instead of current + * address. + */ + if (direct_rpa) { + if (bacmp(&req->hdev->random_addr, direct_rpa)) + hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, + direct_rpa); + + /* direct address is always RPA */ + own_addr_type = ADDR_LE_DEV_RANDOM; + } else { + /* Update random address, but set require_privacy to false so + * that we never connect with an non-resolvable address. + */ + if (hci_update_random_address(req, false, conn_use_rpa(conn), + &own_addr_type)) + return; + } + + if (use_ext_conn(hdev)) { + struct hci_cp_le_ext_create_conn *cp; + struct hci_cp_le_ext_conn_param *p; + u8 data[sizeof(*cp) + sizeof(*p) * 3]; + u32 plen; + + cp = (void *) data; + p = (void *) cp->data; + + memset(cp, 0, sizeof(*cp)); + + bacpy(&cp->peer_addr, &conn->dst); + cp->peer_addr_type = conn->dst_type; + cp->own_addr_type = own_addr_type; + + plen = sizeof(*cp); + + if (scan_1m(hdev)) { + cp->phys |= LE_SCAN_PHY_1M; + set_ext_conn_params(conn, p); + + p++; + plen += sizeof(*p); + } + + if (scan_2m(hdev)) { + cp->phys |= LE_SCAN_PHY_2M; + set_ext_conn_params(conn, p); + + p++; + plen += sizeof(*p); + } + + if (scan_coded(hdev)) { + cp->phys |= LE_SCAN_PHY_CODED; + set_ext_conn_params(conn, p); + + plen += sizeof(*p); + } + + hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data); + + } else { + struct hci_cp_le_create_conn cp; + + memset(&cp, 0, sizeof(cp)); + + cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect); + cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect); + + bacpy(&cp.peer_addr, &conn->dst); + cp.peer_addr_type = conn->dst_type; + cp.own_address_type = own_addr_type; + cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval); + cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval); + cp.conn_latency = cpu_to_le16(conn->le_conn_latency); + cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout); + cp.min_ce_len = cpu_to_le16(0x0000); + cp.max_ce_len = cpu_to_le16(0x0000); + + hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp); + } + + conn->state = BT_CONNECT; + clear_bit(HCI_CONN_SCANNING, &conn->flags); +} + +static void hci_req_directed_advertising(struct hci_request *req, + struct hci_conn *conn) +{ + struct hci_dev *hdev = req->hdev; + u8 own_addr_type; + u8 enable; + + if (ext_adv_capable(hdev)) { + struct hci_cp_le_set_ext_adv_params cp; + bdaddr_t random_addr; + + /* Set require_privacy to false so that the remote device has a + * chance of identifying us. + */ + if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL, + &own_addr_type, &random_addr) < 0) + return; + + memset(&cp, 0, sizeof(cp)); + + cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND); + cp.own_addr_type = own_addr_type; + cp.channel_map = hdev->le_adv_channel_map; + cp.tx_power = HCI_TX_POWER_INVALID; + cp.primary_phy = HCI_ADV_PHY_1M; + cp.secondary_phy = HCI_ADV_PHY_1M; + cp.handle = 0; /* Use instance 0 for directed adv */ + cp.own_addr_type = own_addr_type; + cp.peer_addr_type = conn->dst_type; + bacpy(&cp.peer_addr, &conn->dst); + + /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for + * advertising_event_property LE_LEGACY_ADV_DIRECT_IND + * does not supports advertising data when the advertising set already + * contains some, the controller shall return erroc code 'Invalid + * HCI Command Parameters(0x12). + * So it is required to remove adv set for handle 0x00. since we use + * instance 0 for directed adv. + */ + __hci_req_remove_ext_adv_instance(req, cp.handle); + + hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp); + + if (own_addr_type == ADDR_LE_DEV_RANDOM && + bacmp(&random_addr, BDADDR_ANY) && + bacmp(&random_addr, &hdev->random_addr)) { + struct hci_cp_le_set_adv_set_rand_addr cp; + + memset(&cp, 0, sizeof(cp)); + + cp.handle = 0; + bacpy(&cp.bdaddr, &random_addr); + + hci_req_add(req, + HCI_OP_LE_SET_ADV_SET_RAND_ADDR, + sizeof(cp), &cp); + } + + __hci_req_enable_ext_advertising(req, 0x00); + } else { + struct hci_cp_le_set_adv_param cp; + + /* Clear the HCI_LE_ADV bit temporarily so that the + * hci_update_random_address knows that it's safe to go ahead + * and write a new random address. The flag will be set back on + * as soon as the SET_ADV_ENABLE HCI command completes. + */ + hci_dev_clear_flag(hdev, HCI_LE_ADV); + + /* Set require_privacy to false so that the remote device has a + * chance of identifying us. + */ + if (hci_update_random_address(req, false, conn_use_rpa(conn), + &own_addr_type) < 0) + return; + + memset(&cp, 0, sizeof(cp)); + + /* Some controllers might reject command if intervals are not + * within range for undirected advertising. + * BCM20702A0 is known to be affected by this. + */ + cp.min_interval = cpu_to_le16(0x0020); + cp.max_interval = cpu_to_le16(0x0020); + + cp.type = LE_ADV_DIRECT_IND; + cp.own_address_type = own_addr_type; + cp.direct_addr_type = conn->dst_type; + bacpy(&cp.direct_addr, &conn->dst); + cp.channel_map = hdev->le_adv_channel_map; + + hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp); + + enable = 0x01; + hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), + &enable); + } + + conn->state = BT_CONNECT; +} + +struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, + u8 dst_type, u8 sec_level, u16 conn_timeout, + u8 role, bdaddr_t *direct_rpa) +{ + struct hci_conn_params *params; + struct hci_conn *conn; + struct smp_irk *irk; + struct hci_request req; + int err; + + /* This ensures that during disable le_scan address resolution + * will not be disabled if it is followed by le_create_conn + */ + bool rpa_le_conn = true; + + /* 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); + } + + /* 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(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; + + hci_req_init(&req, hdev); + + /* Disable advertising if we're active. For central role + * connections most controllers will refuse to connect if + * advertising is enabled, and for peripheral role connections we + * anyway have to disable it in order to start directed + * advertising. + */ + if (hci_dev_test_flag(hdev, HCI_LE_ADV)) + __hci_req_disable_advertising(&req); + + /* If requested to connect as peripheral use directed advertising */ + if (conn->role == HCI_ROLE_SLAVE) { + /* If we're active scanning most controllers are unable + * to initiate advertising. Simply reject the attempt. + */ + if (hci_dev_test_flag(hdev, HCI_LE_SCAN) && + hdev->le_scan_type == LE_SCAN_ACTIVE) { + hci_req_purge(&req); + hci_conn_del(conn); + return ERR_PTR(-EBUSY); + } + + hci_req_directed_advertising(&req, conn); + goto create_conn; + } + + params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); + if (params) { + conn->le_conn_min_interval = params->conn_min_interval; + conn->le_conn_max_interval = params->conn_max_interval; + conn->le_conn_latency = params->conn_latency; + conn->le_supv_timeout = params->supervision_timeout; + } else { + conn->le_conn_min_interval = hdev->le_conn_min_interval; + conn->le_conn_max_interval = hdev->le_conn_max_interval; + conn->le_conn_latency = hdev->le_conn_latency; + conn->le_supv_timeout = hdev->le_supv_timeout; + } + + /* If controller is scanning, we stop it since some controllers are + * not able to scan and connect at the same time. Also set the + * HCI_LE_SCAN_INTERRUPTED flag so that the command complete + * handler for scan disabling knows to set the correct discovery + * state. + */ + if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) { + hci_req_add_le_scan_disable(&req, rpa_le_conn); + hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED); + } + + hci_req_add_le_create_conn(&req, conn, direct_rpa); + +create_conn: + err = hci_req_run(&req, 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) { + list_del_init(¶ms->action); + list_add(¶ms->action, &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; +} + +/* 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(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_background_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(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; +} + +struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, + __u16 setting) +{ + struct hci_conn *acl; + struct hci_conn *sco; + + 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(hdev, type, dst, HCI_ROLE_MASTER); + if (!sco) { + hci_conn_drop(acl); + return ERR_PTR(-ENOMEM); + } + } + + acl->link = sco; + sco->link = acl; + + hci_conn_hold(sco); + + sco->setting = setting; + + 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; +} + +/* 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 hci_conn_hash *h = &hdev->conn_hash; + struct hci_conn *c, *n; + + BT_DBG("hdev %s", hdev->name); + + list_for_each_entry_safe(c, n, &h->list, list) { + c->state = BT_CLOSED; + + hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM); + hci_conn_del(c); + } +} + +/* 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 + * CSB 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; +} |