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conn.c
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conn.c
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/* conn.c - Bluetooth connection handling */
/*
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <atomic.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#include <misc/slist.h>
#include <misc/stack.h>
#include <misc/__assert.h>
#include <bluetooth/hci.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/conn.h>
#include <bluetooth/hci_driver.h>
#include <bluetooth/att.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_CONN)
#define LOG_MODULE_NAME bt_conn
#include "common/log.h"
#include "hci_core.h"
#include "conn_internal.h"
#include "l2cap_internal.h"
#include "keys.h"
#include "smp.h"
#include "att_internal.h"
#include "gatt_internal.h"
NET_BUF_POOL_DEFINE(acl_tx_pool, CONFIG_BT_L2CAP_TX_BUF_COUNT,
BT_L2CAP_BUF_SIZE(CONFIG_BT_L2CAP_TX_MTU),
BT_BUF_USER_DATA_MIN, NULL);
#if CONFIG_BT_L2CAP_TX_FRAG_COUNT > 0
#if defined(BT_CTLR_TX_BUFFER_SIZE)
#define FRAG_SIZE BT_L2CAP_BUF_SIZE(BT_CTLR_TX_BUFFER_SIZE - 4)
#else
#define FRAG_SIZE BT_L2CAP_BUF_SIZE(CONFIG_BT_L2CAP_TX_MTU)
#endif
/* Dedicated pool for fragment buffers in case queued up TX buffers don't
* fit the controllers buffer size. We can't use the acl_tx_pool for the
* fragmentation, since it's possible that pool is empty and all buffers
* are queued up in the TX queue. In such a situation, trying to allocate
* another buffer from the acl_tx_pool would result in a deadlock.
*/
NET_BUF_POOL_FIXED_DEFINE(frag_pool, CONFIG_BT_L2CAP_TX_FRAG_COUNT, FRAG_SIZE,
NULL);
#endif /* CONFIG_BT_L2CAP_TX_FRAG_COUNT > 0 */
/* How long until we cancel HCI_LE_Create_Connection */
#define CONN_TIMEOUT K_SECONDS(CONFIG_BT_CREATE_CONN_TIMEOUT)
#if defined(CONFIG_BT_SMP) || defined(CONFIG_BT_BREDR)
const struct bt_conn_auth_cb *bt_auth;
#endif /* CONFIG_BT_SMP || CONFIG_BT_BREDR */
static struct bt_conn conns[CONFIG_BT_MAX_CONN];
static struct bt_conn_cb *callback_list;
#define conn_tx(buf) ((struct bt_conn_tx_data *)net_buf_user_data(buf))
static struct bt_conn_tx conn_tx[CONFIG_BT_CONN_TX_MAX];
K_FIFO_DEFINE(free_tx);
#if defined(CONFIG_BT_BREDR)
static struct bt_conn sco_conns[CONFIG_BT_MAX_SCO_CONN];
enum pairing_method {
LEGACY, /* Legacy (pre-SSP) pairing */
JUST_WORKS, /* JustWorks pairing */
PASSKEY_INPUT, /* Passkey Entry input */
PASSKEY_DISPLAY, /* Passkey Entry display */
PASSKEY_CONFIRM, /* Passkey confirm */
};
/* based on table 5.7, Core Spec 4.2, Vol.3 Part C, 5.2.2.6 */
static const u8_t ssp_method[4 /* remote */][4 /* local */] = {
{ JUST_WORKS, JUST_WORKS, PASSKEY_INPUT, JUST_WORKS },
{ JUST_WORKS, PASSKEY_CONFIRM, PASSKEY_INPUT, JUST_WORKS },
{ PASSKEY_DISPLAY, PASSKEY_DISPLAY, PASSKEY_INPUT, JUST_WORKS },
{ JUST_WORKS, JUST_WORKS, JUST_WORKS, JUST_WORKS },
};
#endif /* CONFIG_BT_BREDR */
struct k_sem *bt_conn_get_pkts(struct bt_conn *conn)
{
#if defined(CONFIG_BT_BREDR)
if (conn->type == BT_CONN_TYPE_BR || !bt_dev.le.mtu) {
return &bt_dev.br.pkts;
}
#endif /* CONFIG_BT_BREDR */
return &bt_dev.le.pkts;
}
static inline const char *state2str(bt_conn_state_t state)
{
switch (state) {
case BT_CONN_DISCONNECTED:
return "disconnected";
case BT_CONN_CONNECT_SCAN:
return "connect-scan";
case BT_CONN_CONNECT_DIR_ADV:
return "connect-dir-adv";
case BT_CONN_CONNECT:
return "connect";
case BT_CONN_CONNECTED:
return "connected";
case BT_CONN_DISCONNECT:
return "disconnect";
default:
return "(unknown)";
}
}
static void notify_connected(struct bt_conn *conn)
{
struct bt_conn_cb *cb;
for (cb = callback_list; cb; cb = cb->_next) {
if (cb->connected) {
cb->connected(conn, conn->err);
}
}
if (!conn->err) {
bt_gatt_connected(conn);
}
}
static void notify_disconnected(struct bt_conn *conn)
{
struct bt_conn_cb *cb;
for (cb = callback_list; cb; cb = cb->_next) {
if (cb->disconnected) {
cb->disconnected(conn, conn->err);
}
}
}
void notify_le_param_updated(struct bt_conn *conn)
{
struct bt_conn_cb *cb;
/* If new connection parameters meet requirement of pending
* parameters don't send slave conn param request anymore on timeout
*/
if (atomic_test_bit(conn->flags, BT_CONN_SLAVE_PARAM_SET) &&
conn->le.interval >= conn->le.interval_min &&
conn->le.interval <= conn->le.interval_max &&
conn->le.latency == conn->le.pending_latency &&
conn->le.timeout == conn->le.pending_timeout) {
atomic_clear_bit(conn->flags, BT_CONN_SLAVE_PARAM_SET);
}
for (cb = callback_list; cb; cb = cb->_next) {
if (cb->le_param_updated) {
cb->le_param_updated(conn, conn->le.interval,
conn->le.latency,
conn->le.timeout);
}
}
}
bool le_param_req(struct bt_conn *conn, struct bt_le_conn_param *param)
{
struct bt_conn_cb *cb;
if (!bt_le_conn_params_valid(param)) {
return false;
}
for (cb = callback_list; cb; cb = cb->_next) {
if (!cb->le_param_req) {
continue;
}
if (!cb->le_param_req(conn, param)) {
return false;
}
/* The callback may modify the parameters so we need to
* double-check that it returned valid parameters.
*/
if (!bt_le_conn_params_valid(param)) {
return false;
}
}
/* Default to accepting if there's no app callback */
return true;
}
static int send_conn_le_param_update(struct bt_conn *conn,
const struct bt_le_conn_param *param)
{
BT_DBG("conn %p features 0x%02x params (%d-%d %d %d)", conn,
conn->le.features[0], param->interval_min,
param->interval_max, param->latency, param->timeout);
/* Use LE connection parameter request if both local and remote support
* it; or if local role is master then use LE connection update.
*/
if ((BT_FEAT_LE_CONN_PARAM_REQ_PROC(bt_dev.le.features) &&
BT_FEAT_LE_CONN_PARAM_REQ_PROC(conn->le.features) &&
!atomic_test_bit(conn->flags, BT_CONN_SLAVE_PARAM_L2CAP)) ||
(conn->role == BT_HCI_ROLE_MASTER)) {
int rc;
rc = bt_conn_le_conn_update(conn, param);
/* store those in case of fallback to L2CAP */
if (rc == 0) {
conn->le.pending_latency = param->latency;
conn->le.pending_timeout = param->timeout;
}
return rc;
}
/* If remote master does not support LL Connection Parameters Request
* Procedure
*/
return bt_l2cap_update_conn_param(conn, param);
}
static void conn_le_update_timeout(struct k_work *work)
{
struct bt_conn_le *le = CONTAINER_OF(work, struct bt_conn_le,
update_work);
struct bt_conn *conn = CONTAINER_OF(le, struct bt_conn, le);
const struct bt_le_conn_param *param;
BT_DBG("conn %p", conn);
if (IS_ENABLED(CONFIG_BT_CENTRAL) &&
conn->role == BT_CONN_ROLE_MASTER) {
/* we don't call bt_conn_disconnect as it would also clear
* auto connect flag if it was set, instead just cancel
* connection directly
*/
bt_hci_cmd_send(BT_HCI_OP_LE_CREATE_CONN_CANCEL, NULL);
return;
}
#if defined (CONFIG_BT_GAP_PERIPHERAL_PREF_PARAMS)
/* if application set own params use those, otherwise use defaults */
if (atomic_test_and_clear_bit(conn->flags, BT_CONN_SLAVE_PARAM_SET)) {
param = BT_LE_CONN_PARAM(conn->le.interval_min,
conn->le.interval_max,
conn->le.pending_latency,
conn->le.pending_timeout);
send_conn_le_param_update(conn, param);
} else {
param = BT_LE_CONN_PARAM(CONFIG_BT_PERIPHERAL_PREF_MIN_INT,
CONFIG_BT_PERIPHERAL_PREF_MAX_INT,
CONFIG_BT_PERIPHERAL_PREF_SLAVE_LATENCY,
CONFIG_BT_PERIPHERAL_PREF_TIMEOUT);
send_conn_le_param_update(conn, param);
}
#else
/* update only if application set own params */
if (atomic_test_and_clear_bit(conn->flags, BT_CONN_SLAVE_PARAM_SET)) {
param = BT_LE_CONN_PARAM(conn->le.interval_min,
conn->le.interval_max,
conn->le.latency,
conn->le.timeout);
send_conn_le_param_update(conn, param);
}
#endif
atomic_set_bit(conn->flags, BT_CONN_SLAVE_PARAM_UPDATE);
}
static void tx_free(struct bt_conn_tx *tx)
{
if (tx->conn) {
bt_conn_unref(tx->conn);
tx->conn = NULL;
}
tx->data.cb = NULL;
tx->data.user_data = NULL;
k_fifo_put(&free_tx, tx);
}
static void tx_notify_cb(struct k_work *work)
{
struct bt_conn_tx *tx = CONTAINER_OF(work, struct bt_conn_tx, work);
struct bt_conn *conn;
struct bt_conn_tx_data data;
BT_DBG("tx %p conn %p cb %p user_data %p", tx, tx->conn, tx->data.cb,
tx->data.user_data);
/* Copy over the params */
conn = bt_conn_ref(tx->conn);
data = tx->data;
/* Free up TX notify since there may be user waiting */
tx_free(tx);
/* Run the callback, at this point it should be safe to allocate new
* buffers since the TX should have been unblocked by tx_free.
*/
data.cb(conn, data.user_data);
bt_conn_unref(conn);
}
static struct bt_conn *conn_new(void)
{
struct bt_conn *conn = NULL;
int i;
for (i = 0; i < ARRAY_SIZE(conns); i++) {
if (!atomic_get(&conns[i].ref)) {
conn = &conns[i];
break;
}
}
if (!conn) {
return NULL;
}
(void)memset(conn, 0, sizeof(*conn));
atomic_set(&conn->ref, 1);
return conn;
}
#if defined(CONFIG_BT_BREDR)
void bt_sco_cleanup(struct bt_conn *sco_conn)
{
bt_conn_unref(sco_conn->sco.acl);
sco_conn->sco.acl = NULL;
bt_conn_unref(sco_conn);
}
static struct bt_conn *sco_conn_new(void)
{
struct bt_conn *sco_conn = NULL;
int i;
for (i = 0; i < ARRAY_SIZE(sco_conns); i++) {
if (!atomic_get(&sco_conns[i].ref)) {
sco_conn = &sco_conns[i];
break;
}
}
if (!sco_conn) {
return NULL;
}
(void)memset(sco_conn, 0, sizeof(*sco_conn));
atomic_set(&sco_conn->ref, 1);
return sco_conn;
}
struct bt_conn *bt_conn_create_br(const bt_addr_t *peer,
const struct bt_br_conn_param *param)
{
struct bt_hci_cp_connect *cp;
struct bt_conn *conn;
struct net_buf *buf;
conn = bt_conn_lookup_addr_br(peer);
if (conn) {
switch (conn->state) {
case BT_CONN_CONNECT:
case BT_CONN_CONNECTED:
return conn;
default:
bt_conn_unref(conn);
return NULL;
}
}
conn = bt_conn_add_br(peer);
if (!conn) {
return NULL;
}
buf = bt_hci_cmd_create(BT_HCI_OP_CONNECT, sizeof(*cp));
if (!buf) {
bt_conn_unref(conn);
return NULL;
}
cp = net_buf_add(buf, sizeof(*cp));
(void)memset(cp, 0, sizeof(*cp));
memcpy(&cp->bdaddr, peer, sizeof(cp->bdaddr));
cp->packet_type = sys_cpu_to_le16(0xcc18); /* DM1 DH1 DM3 DH5 DM5 DH5 */
cp->pscan_rep_mode = 0x02; /* R2 */
cp->allow_role_switch = param->allow_role_switch ? 0x01 : 0x00;
cp->clock_offset = 0x0000; /* TODO used cached clock offset */
if (bt_hci_cmd_send_sync(BT_HCI_OP_CONNECT, buf, NULL) < 0) {
bt_conn_unref(conn);
return NULL;
}
bt_conn_set_state(conn, BT_CONN_CONNECT);
conn->role = BT_CONN_ROLE_MASTER;
return conn;
}
struct bt_conn *bt_conn_create_sco(const bt_addr_t *peer)
{
struct bt_hci_cp_setup_sync_conn *cp;
struct bt_conn *sco_conn;
struct net_buf *buf;
int link_type;
sco_conn = bt_conn_lookup_addr_sco(peer);
if (sco_conn) {
switch (sco_conn->state) {
case BT_CONN_CONNECT:
case BT_CONN_CONNECTED:
return sco_conn;
default:
bt_conn_unref(sco_conn);
return NULL;
}
}
if (BT_FEAT_LMP_ESCO_CAPABLE(bt_dev.features)) {
link_type = BT_HCI_ESCO;
} else {
link_type = BT_HCI_SCO;
}
sco_conn = bt_conn_add_sco(peer, link_type);
if (!sco_conn) {
return NULL;
}
buf = bt_hci_cmd_create(BT_HCI_OP_SETUP_SYNC_CONN, sizeof(*cp));
if (!buf) {
bt_sco_cleanup(sco_conn);
return NULL;
}
cp = net_buf_add(buf, sizeof(*cp));
(void)memset(cp, 0, sizeof(*cp));
BT_ERR("handle : %x", sco_conn->sco.acl->handle);
cp->handle = sco_conn->sco.acl->handle;
cp->pkt_type = sco_conn->sco.pkt_type;
cp->tx_bandwidth = 0x00001f40;
cp->rx_bandwidth = 0x00001f40;
cp->max_latency = 0x0007;
cp->retrans_effort = 0x01;
cp->content_format = BT_VOICE_CVSD_16BIT;
if (bt_hci_cmd_send_sync(BT_HCI_OP_SETUP_SYNC_CONN, buf,
NULL) < 0) {
bt_sco_cleanup(sco_conn);
return NULL;
}
bt_conn_set_state(sco_conn, BT_CONN_CONNECT);
return sco_conn;
}
struct bt_conn *bt_conn_lookup_addr_sco(const bt_addr_t *peer)
{
int i;
for (i = 0; i < ARRAY_SIZE(sco_conns); i++) {
if (!atomic_get(&sco_conns[i].ref)) {
continue;
}
if (sco_conns[i].type != BT_CONN_TYPE_SCO) {
continue;
}
if (!bt_addr_cmp(peer, &sco_conns[i].sco.acl->br.dst)) {
return bt_conn_ref(&sco_conns[i]);
}
}
return NULL;
}
struct bt_conn *bt_conn_lookup_addr_br(const bt_addr_t *peer)
{
int i;
for (i = 0; i < ARRAY_SIZE(conns); i++) {
if (!atomic_get(&conns[i].ref)) {
continue;
}
if (conns[i].type != BT_CONN_TYPE_BR) {
continue;
}
if (!bt_addr_cmp(peer, &conns[i].br.dst)) {
return bt_conn_ref(&conns[i]);
}
}
return NULL;
}
struct bt_conn *bt_conn_add_sco(const bt_addr_t *peer, int link_type)
{
struct bt_conn *sco_conn = sco_conn_new();
if (!sco_conn) {
return NULL;
}
sco_conn->sco.acl = bt_conn_lookup_addr_br(peer);
sco_conn->type = BT_CONN_TYPE_SCO;
if (link_type == BT_HCI_SCO) {
if (BT_FEAT_LMP_ESCO_CAPABLE(bt_dev.features)) {
sco_conn->sco.pkt_type = (bt_dev.br.esco_pkt_type &
ESCO_PKT_MASK);
} else {
sco_conn->sco.pkt_type = (bt_dev.br.esco_pkt_type &
SCO_PKT_MASK);
}
} else if (link_type == BT_HCI_ESCO) {
sco_conn->sco.pkt_type = (bt_dev.br.esco_pkt_type &
~EDR_ESCO_PKT_MASK);
}
return sco_conn;
}
struct bt_conn *bt_conn_add_br(const bt_addr_t *peer)
{
struct bt_conn *conn = conn_new();
if (!conn) {
return NULL;
}
bt_addr_copy(&conn->br.dst, peer);
conn->type = BT_CONN_TYPE_BR;
return conn;
}
static int pin_code_neg_reply(const bt_addr_t *bdaddr)
{
struct bt_hci_cp_pin_code_neg_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_PIN_CODE_NEG_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, bdaddr);
return bt_hci_cmd_send_sync(BT_HCI_OP_PIN_CODE_NEG_REPLY, buf, NULL);
}
static int pin_code_reply(struct bt_conn *conn, const char *pin, u8_t len)
{
struct bt_hci_cp_pin_code_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_PIN_CODE_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, &conn->br.dst);
cp->pin_len = len;
strncpy((char *)cp->pin_code, pin, sizeof(cp->pin_code));
return bt_hci_cmd_send_sync(BT_HCI_OP_PIN_CODE_REPLY, buf, NULL);
}
int bt_conn_auth_pincode_entry(struct bt_conn *conn, const char *pin)
{
size_t len;
if (!bt_auth) {
return -EINVAL;
}
if (conn->type != BT_CONN_TYPE_BR) {
return -EINVAL;
}
len = strlen(pin);
if (len > 16) {
return -EINVAL;
}
if (conn->required_sec_level == BT_SECURITY_HIGH && len < 16) {
BT_WARN("PIN code for %s is not 16 bytes wide",
bt_addr_str(&conn->br.dst));
return -EPERM;
}
/* Allow user send entered PIN to remote, then reset user state. */
if (!atomic_test_and_clear_bit(conn->flags, BT_CONN_USER)) {
return -EPERM;
}
if (len == 16) {
atomic_set_bit(conn->flags, BT_CONN_BR_LEGACY_SECURE);
}
return pin_code_reply(conn, pin, len);
}
void bt_conn_pin_code_req(struct bt_conn *conn)
{
if (bt_auth && bt_auth->pincode_entry) {
bool secure = false;
if (conn->required_sec_level == BT_SECURITY_HIGH) {
secure = true;
}
atomic_set_bit(conn->flags, BT_CONN_USER);
atomic_set_bit(conn->flags, BT_CONN_BR_PAIRING);
bt_auth->pincode_entry(conn, secure);
} else {
pin_code_neg_reply(&conn->br.dst);
}
}
u8_t bt_conn_get_io_capa(void)
{
if (!bt_auth) {
return BT_IO_NO_INPUT_OUTPUT;
}
if (bt_auth->passkey_confirm && bt_auth->passkey_display) {
return BT_IO_DISPLAY_YESNO;
}
if (bt_auth->passkey_entry) {
return BT_IO_KEYBOARD_ONLY;
}
if (bt_auth->passkey_display) {
return BT_IO_DISPLAY_ONLY;
}
return BT_IO_NO_INPUT_OUTPUT;
}
static u8_t ssp_pair_method(const struct bt_conn *conn)
{
return ssp_method[conn->br.remote_io_capa][bt_conn_get_io_capa()];
}
u8_t bt_conn_ssp_get_auth(const struct bt_conn *conn)
{
/* Validate no bond auth request, and if valid use it. */
if ((conn->br.remote_auth == BT_HCI_NO_BONDING) ||
((conn->br.remote_auth == BT_HCI_NO_BONDING_MITM) &&
(ssp_pair_method(conn) > JUST_WORKS))) {
return conn->br.remote_auth;
}
/* Local & remote have enough IO capabilities to get MITM protection. */
if (ssp_pair_method(conn) > JUST_WORKS) {
return conn->br.remote_auth | BT_MITM;
}
/* No MITM protection possible so ignore remote MITM requirement. */
return (conn->br.remote_auth & ~BT_MITM);
}
static int ssp_confirm_reply(struct bt_conn *conn)
{
struct bt_hci_cp_user_confirm_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_USER_CONFIRM_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, &conn->br.dst);
return bt_hci_cmd_send_sync(BT_HCI_OP_USER_CONFIRM_REPLY, buf, NULL);
}
static int ssp_confirm_neg_reply(struct bt_conn *conn)
{
struct bt_hci_cp_user_confirm_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_USER_CONFIRM_NEG_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, &conn->br.dst);
return bt_hci_cmd_send_sync(BT_HCI_OP_USER_CONFIRM_NEG_REPLY, buf,
NULL);
}
void bt_conn_ssp_auth(struct bt_conn *conn, u32_t passkey)
{
conn->br.pairing_method = ssp_pair_method(conn);
/*
* If local required security is HIGH then MITM is mandatory.
* MITM protection is no achievable when SSP 'justworks' is applied.
*/
if (conn->required_sec_level > BT_SECURITY_MEDIUM &&
conn->br.pairing_method == JUST_WORKS) {
BT_DBG("MITM protection infeasible for required security");
ssp_confirm_neg_reply(conn);
return;
}
switch (conn->br.pairing_method) {
case PASSKEY_CONFIRM:
atomic_set_bit(conn->flags, BT_CONN_USER);
bt_auth->passkey_confirm(conn, passkey);
break;
case PASSKEY_DISPLAY:
atomic_set_bit(conn->flags, BT_CONN_USER);
bt_auth->passkey_display(conn, passkey);
break;
case PASSKEY_INPUT:
atomic_set_bit(conn->flags, BT_CONN_USER);
bt_auth->passkey_entry(conn);
break;
case JUST_WORKS:
/*
* When local host works as pairing acceptor and 'justworks'
* model is applied then notify user about such pairing request.
* [BT Core 4.2 table 5.7, Vol 3, Part C, 5.2.2.6]
*/
if (bt_auth && bt_auth->pairing_confirm &&
!atomic_test_bit(conn->flags,
BT_CONN_BR_PAIRING_INITIATOR)) {
atomic_set_bit(conn->flags, BT_CONN_USER);
bt_auth->pairing_confirm(conn);
break;
}
ssp_confirm_reply(conn);
break;
default:
break;
}
}
static int ssp_passkey_reply(struct bt_conn *conn, unsigned int passkey)
{
struct bt_hci_cp_user_passkey_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_USER_PASSKEY_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, &conn->br.dst);
cp->passkey = sys_cpu_to_le32(passkey);
return bt_hci_cmd_send_sync(BT_HCI_OP_USER_PASSKEY_REPLY, buf, NULL);
}
static int ssp_passkey_neg_reply(struct bt_conn *conn)
{
struct bt_hci_cp_user_passkey_neg_reply *cp;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_USER_PASSKEY_NEG_REPLY, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
bt_addr_copy(&cp->bdaddr, &conn->br.dst);
return bt_hci_cmd_send_sync(BT_HCI_OP_USER_PASSKEY_NEG_REPLY, buf,
NULL);
}
static int bt_hci_connect_br_cancel(struct bt_conn *conn)
{
struct bt_hci_cp_connect_cancel *cp;
struct bt_hci_rp_connect_cancel *rp;
struct net_buf *buf, *rsp;
int err;
buf = bt_hci_cmd_create(BT_HCI_OP_CONNECT_CANCEL, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
memcpy(&cp->bdaddr, &conn->br.dst, sizeof(cp->bdaddr));
err = bt_hci_cmd_send_sync(BT_HCI_OP_CONNECT_CANCEL, buf, &rsp);
if (err) {
return err;
}
rp = (void *)rsp->data;
err = rp->status ? -EIO : 0;
net_buf_unref(rsp);
return err;
}
static int conn_auth(struct bt_conn *conn)
{
struct bt_hci_cp_auth_requested *auth;
struct net_buf *buf;
BT_DBG("");
buf = bt_hci_cmd_create(BT_HCI_OP_AUTH_REQUESTED, sizeof(*auth));
if (!buf) {
return -ENOBUFS;
}
auth = net_buf_add(buf, sizeof(*auth));
auth->handle = sys_cpu_to_le16(conn->handle);
atomic_set_bit(conn->flags, BT_CONN_BR_PAIRING_INITIATOR);
return bt_hci_cmd_send_sync(BT_HCI_OP_AUTH_REQUESTED, buf, NULL);
}
#endif /* CONFIG_BT_BREDR */
#if defined(CONFIG_BT_SMP)
void bt_conn_identity_resolved(struct bt_conn *conn)
{
const bt_addr_le_t *rpa;
struct bt_conn_cb *cb;
if (conn->role == BT_HCI_ROLE_MASTER) {
rpa = &conn->le.resp_addr;
} else {
rpa = &conn->le.init_addr;
}
for (cb = callback_list; cb; cb = cb->_next) {
if (cb->identity_resolved) {
cb->identity_resolved(conn, rpa, &conn->le.dst);
}
}
}
int bt_conn_le_start_encryption(struct bt_conn *conn, u8_t rand[8],
u8_t ediv[2], const u8_t *ltk, size_t len)
{
struct bt_hci_cp_le_start_encryption *cp;
struct net_buf *buf;
buf = bt_hci_cmd_create(BT_HCI_OP_LE_START_ENCRYPTION, sizeof(*cp));
if (!buf) {
return -ENOBUFS;
}
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(conn->handle);
memcpy(&cp->rand, rand, sizeof(cp->rand));
memcpy(&cp->ediv, ediv, sizeof(cp->ediv));
memcpy(cp->ltk, ltk, len);
if (len < sizeof(cp->ltk)) {
(void)memset(cp->ltk + len, 0, sizeof(cp->ltk) - len);
}
return bt_hci_cmd_send_sync(BT_HCI_OP_LE_START_ENCRYPTION, buf, NULL);
}
#endif /* CONFIG_BT_SMP */
#if defined(CONFIG_BT_SMP) || defined(CONFIG_BT_BREDR)
u8_t bt_conn_enc_key_size(struct bt_conn *conn)
{
if (!conn->encrypt) {
return 0;
}
if (IS_ENABLED(CONFIG_BT_BREDR) &&
conn->type == BT_CONN_TYPE_BR) {
struct bt_hci_cp_read_encryption_key_size *cp;
struct bt_hci_rp_read_encryption_key_size *rp;
struct net_buf *buf;
struct net_buf *rsp;
u8_t key_size;
buf = bt_hci_cmd_create(BT_HCI_OP_READ_ENCRYPTION_KEY_SIZE,
sizeof(*cp));
if (!buf) {
return 0;
}
cp = net_buf_add(buf, sizeof(*cp));
cp->handle = sys_cpu_to_le16(conn->handle);
if (bt_hci_cmd_send_sync(BT_HCI_OP_READ_ENCRYPTION_KEY_SIZE,
buf, &rsp)) {
return 0;
}
rp = (void *)rsp->data;
key_size = rp->status ? 0 : rp->key_size;
net_buf_unref(rsp);
return key_size;
}
if (IS_ENABLED(CONFIG_BT_SMP)) {
return conn->le.keys ? conn->le.keys->enc_size : 0;
}
return 0;
}
void bt_conn_security_changed(struct bt_conn *conn)
{
struct bt_conn_cb *cb;
for (cb = callback_list; cb; cb = cb->_next) {
if (cb->security_changed) {
cb->security_changed(conn, conn->sec_level);
}
}
}
static int start_security(struct bt_conn *conn)
{
#if defined(CONFIG_BT_BREDR)
if (conn->type == BT_CONN_TYPE_BR) {
if (atomic_test_bit(conn->flags, BT_CONN_BR_PAIRING)) {
return -EBUSY;
}
if (conn->required_sec_level > BT_SECURITY_HIGH) {
return -ENOTSUP;
}
if (bt_conn_get_io_capa() == BT_IO_NO_INPUT_OUTPUT &&
conn->required_sec_level > BT_SECURITY_MEDIUM) {
return -EINVAL;
}
return conn_auth(conn);