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hciops.c
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hciops.c
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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>
#include <glib.h>
#include "hcid.h"
#include "sdpd.h"
#include "btio.h"
#include "adapter.h"
#include "device.h"
#include "plugin.h"
#include "log.h"
#include "storage.h"
#include "event.h"
#include "manager.h"
#include "oob.h"
#include "eir.h"
#define DISCOV_HALTED 0
#define DISCOV_INQ 1
#define DISCOV_SCAN 2
#define TIMEOUT_BR_LE_SCAN 5120 /* TGAP(100)/2 */
#define TIMEOUT_LE_SCAN 10240 /* TGAP(gen_disc_scan_min) */
#define LENGTH_BR_INQ 0x08
#define LENGTH_BR_LE_INQ 0x04
static int hciops_start_scanning(int index, int timeout);
static int child_pipe[2] = { -1, -1 };
static guint child_io_id = 0;
static guint ctl_io_id = 0;
enum adapter_type {
BR_EDR,
LE_ONLY,
BR_EDR_LE,
UNKNOWN,
};
/* Commands sent by kernel on starting an adapter */
enum {
PENDING_BDADDR,
PENDING_VERSION,
PENDING_FEATURES,
PENDING_NAME,
};
struct bt_conn {
struct dev_info *dev;
bdaddr_t bdaddr;
uint16_t handle;
uint8_t loc_cap;
uint8_t loc_auth;
uint8_t rem_cap;
uint8_t rem_auth;
uint8_t rem_oob_data;
gboolean bonding_initiator;
gboolean secmode3;
GIOChannel *io; /* For raw L2CAP socket (bonding) */
};
struct oob_data {
bdaddr_t bdaddr;
uint8_t hash[16];
uint8_t randomizer[16];
};
static int max_dev = -1;
static struct dev_info {
int id;
int sk;
bdaddr_t bdaddr;
char name[249];
uint8_t eir[HCI_MAX_EIR_LENGTH];
uint8_t features[8];
uint8_t extfeatures[8];
uint8_t ssp_mode;
int8_t tx_power;
int discov_state;
uint32_t current_cod;
uint32_t wanted_cod;
uint32_t pending_cod;
gboolean cache_enable;
gboolean already_up;
gboolean registered;
gboolean pairable;
uint8_t io_capability;
struct hci_version ver;
uint16_t did_vendor;
uint16_t did_product;
uint16_t did_version;
gboolean up;
uint32_t pending;
GIOChannel *io;
guint watch_id;
gboolean debug_keys;
GSList *keys;
uint8_t pin_length;
GSList *oob_data;
GSList *uuids;
GSList *connections;
guint stop_scan_id;
} *devs = NULL;
static inline int get_state(int index)
{
struct dev_info *dev = &devs[index];
return dev->discov_state;
}
static inline gboolean is_resolvname_enabled(void)
{
return main_opts.name_resolv ? TRUE : FALSE;
}
static void set_state(int index, int state)
{
struct btd_adapter *adapter;
struct dev_info *dev = &devs[index];
if (dev->discov_state == state)
return;
adapter = manager_find_adapter_by_id(index);
if (!adapter) {
error("No matching adapter found");
return;
}
dev->discov_state = state;
DBG("hci%d: new state %d", index, dev->discov_state);
switch (dev->discov_state) {
case DISCOV_HALTED:
if (adapter_get_state(adapter) == STATE_SUSPENDED)
return;
if (is_resolvname_enabled() &&
adapter_has_discov_sessions(adapter))
adapter_set_state(adapter, STATE_RESOLVNAME);
else
adapter_set_state(adapter, STATE_IDLE);
break;
case DISCOV_INQ:
case DISCOV_SCAN:
adapter_set_state(adapter, STATE_DISCOV);
break;
}
}
static inline gboolean is_le_capable(int index)
{
struct dev_info *dev = &devs[index];
return (main_opts.le && dev->features[4] & LMP_LE &&
dev->extfeatures[0] & LMP_HOST_LE) ? TRUE : FALSE;
}
static inline gboolean is_bredr_capable(int index)
{
struct dev_info *dev = &devs[index];
return (dev->features[4] & LMP_NO_BREDR) == 0 ? TRUE : FALSE;
}
static int get_adapter_type(int index)
{
if (is_le_capable(index) && is_bredr_capable(index))
return BR_EDR_LE;
else if (is_le_capable(index))
return LE_ONLY;
else if (is_bredr_capable(index))
return BR_EDR;
return UNKNOWN;
}
static int ignore_device(struct hci_dev_info *di)
{
return hci_test_bit(HCI_RAW, &di->flags) || di->type >> 4 != HCI_BREDR;
}
static struct dev_info *init_dev_info(int index, int sk, gboolean registered,
gboolean already_up)
{
struct dev_info *dev = &devs[index];
memset(dev, 0, sizeof(*dev));
dev->id = index;
dev->sk = sk;
dev->cache_enable = TRUE;
dev->registered = registered;
dev->already_up = already_up;
dev->io_capability = 0x03; /* No Input No Output */
dev->discov_state = DISCOV_HALTED;
return dev;
}
/* Async HCI command handling with callback support */
struct hci_cmd_data {
bt_hci_result_t cb;
uint16_t handle;
uint16_t ocf;
gpointer caller_data;
};
static gboolean hci_event_watch(GIOChannel *io,
GIOCondition cond, gpointer user_data)
{
unsigned char buf[HCI_MAX_EVENT_SIZE], *body;
struct hci_cmd_data *cmd = user_data;
evt_cmd_status *evt_status;
evt_auth_complete *evt_auth;
evt_encrypt_change *evt_enc;
hci_event_hdr *hdr;
set_conn_encrypt_cp cp;
int dd;
uint16_t ocf;
uint8_t status = HCI_OE_POWER_OFF;
if (cond & G_IO_NVAL) {
cmd->cb(status, cmd->caller_data);
return FALSE;
}
if (cond & (G_IO_ERR | G_IO_HUP))
goto failed;
dd = g_io_channel_unix_get_fd(io);
if (read(dd, buf, sizeof(buf)) < 0)
goto failed;
hdr = (hci_event_hdr *) (buf + 1);
body = buf + (1 + HCI_EVENT_HDR_SIZE);
switch (hdr->evt) {
case EVT_CMD_STATUS:
evt_status = (evt_cmd_status *) body;
ocf = cmd_opcode_ocf(evt_status->opcode);
if (ocf != cmd->ocf)
return TRUE;
switch (ocf) {
case OCF_AUTH_REQUESTED:
case OCF_SET_CONN_ENCRYPT:
if (evt_status->status != 0) {
/* Baseband rejected command */
status = evt_status->status;
goto failed;
}
break;
default:
return TRUE;
}
/* Wait for the next event */
return TRUE;
case EVT_AUTH_COMPLETE:
evt_auth = (evt_auth_complete *) body;
if (evt_auth->handle != cmd->handle) {
/* Skipping */
return TRUE;
}
if (evt_auth->status != 0x00) {
status = evt_auth->status;
/* Abort encryption */
goto failed;
}
memset(&cp, 0, sizeof(cp));
cp.handle = cmd->handle;
cp.encrypt = 1;
cmd->ocf = OCF_SET_CONN_ENCRYPT;
if (hci_send_cmd(dd, OGF_LINK_CTL, OCF_SET_CONN_ENCRYPT,
SET_CONN_ENCRYPT_CP_SIZE, &cp) < 0) {
status = HCI_COMMAND_DISALLOWED;
goto failed;
}
/* Wait for encrypt change event */
return TRUE;
case EVT_ENCRYPT_CHANGE:
evt_enc = (evt_encrypt_change *) body;
if (evt_enc->handle != cmd->handle)
return TRUE;
/* Procedure finished: reporting status */
status = evt_enc->status;
break;
default:
/* Skipping */
return TRUE;
}
failed:
cmd->cb(status, cmd->caller_data);
g_io_channel_shutdown(io, TRUE, NULL);
return FALSE;
}
static int write_inq_mode(int index, uint8_t mode)
{
struct dev_info *dev = &devs[index];
write_inquiry_mode_cp cp;
memset(&cp, 0, sizeof(cp));
cp.mode = mode;
if (hci_send_cmd(dev->sk, OGF_HOST_CTL, OCF_WRITE_INQUIRY_MODE,
WRITE_INQUIRY_MODE_CP_SIZE, &cp) < 0)
return -errno;
return 0;
}
static uint8_t get_inquiry_mode(int index)
{
struct dev_info *dev = &devs[index];
if (dev->features[6] & LMP_EXT_INQ)
return 2;
if (dev->features[3] & LMP_RSSI_INQ)
return 1;
if (dev->ver.manufacturer == 11 && dev->ver.hci_rev == 0x00 &&
dev->ver.lmp_subver == 0x0757)
return 1;
if (dev->ver.manufacturer == 15) {
if (dev->ver.hci_rev == 0x03 &&
dev->ver.lmp_subver == 0x6963)
return 1;
if (dev->ver.hci_rev == 0x09 &&
dev->ver.lmp_subver == 0x6963)
return 1;
if (dev->ver.hci_rev == 0x00 &&
dev->ver.lmp_subver == 0x6965)
return 1;
}
if (dev->ver.manufacturer == 31 && dev->ver.hci_rev == 0x2005 &&
dev->ver.lmp_subver == 0x1805)
return 1;
return 0;
}
static int init_ssp_mode(int index)
{
struct dev_info *dev = &devs[index];
write_simple_pairing_mode_cp cp;
if (ioctl(dev->sk, HCIGETAUTHINFO, NULL) < 0 && errno == EINVAL)
return 0;
memset(&cp, 0, sizeof(cp));
cp.mode = 0x01;
if (hci_send_cmd(dev->sk, OGF_HOST_CTL,
OCF_WRITE_SIMPLE_PAIRING_MODE,
WRITE_SIMPLE_PAIRING_MODE_CP_SIZE, &cp) < 0)
return -errno;
return 0;
}
static int hciops_set_discoverable(int index, gboolean discoverable)
{
struct dev_info *dev = &devs[index];
uint8_t mode;
if (discoverable)
mode = (SCAN_PAGE | SCAN_INQUIRY);
else
mode = SCAN_PAGE;
DBG("hci%d discoverable %d", index, discoverable);
if (hci_send_cmd(dev->sk, OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE,
1, &mode) < 0)
return -errno;
return 0;
}
static int hciops_set_pairable(int index, gboolean pairable)
{
struct btd_adapter *adapter;
DBG("hci%d pairable %d", index, pairable);
adapter = manager_find_adapter(&devs[index].bdaddr);
if (adapter)
btd_adapter_pairable_changed(adapter, pairable);
devs[index].pairable = pairable;
return 0;
}
static int hciops_power_off(int index)
{
struct dev_info *dev = &devs[index];
uint8_t mode;
DBG("hci%d set scan mode off", index);
mode = SCAN_DISABLED;
if (hci_send_cmd(dev->sk, OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE,
1, &mode) < 0)
return -errno;
DBG("hci%d HCIDEVDOWN", index);
if (ioctl(dev->sk, HCIDEVDOWN, index) < 0 && errno != EALREADY)
return -errno;
return 0;
}
static void set_event_mask(int index)
{
struct dev_info *dev = &devs[index];
/* The second byte is 0xff instead of 0x9f (two reserved bits
* disabled) since a Broadcom 1.2 dongle doesn't respond to the
* command otherwise */
uint8_t events[8] = { 0xff, 0xff, 0xfb, 0xff, 0x00, 0x00, 0x00, 0x00 };
/* Events for 1.2 and newer controllers */
if (dev->ver.lmp_ver > 1) {
events[4] |= 0x01; /* Flow Specification Complete */
events[4] |= 0x02; /* Inquiry Result with RSSI */
events[4] |= 0x04; /* Read Remote Extended Features Complete */
events[5] |= 0x08; /* Synchronous Connection Complete */
events[5] |= 0x10; /* Synchronous Connection Changed */
}
if (dev->features[3] & LMP_RSSI_INQ)
events[4] |= 0x04; /* Inquiry Result with RSSI */
if (dev->features[5] & LMP_SNIFF_SUBR)
events[5] |= 0x20; /* Sniff Subrating */
if (dev->features[5] & LMP_PAUSE_ENC)
events[5] |= 0x80; /* Encryption Key Refresh Complete */
if (dev->features[6] & LMP_EXT_INQ)
events[5] |= 0x40; /* Extended Inquiry Result */
if (dev->features[6] & LMP_NFLUSH_PKTS)
events[7] |= 0x01; /* Enhanced Flush Complete */
if (dev->features[7] & LMP_LSTO)
events[6] |= 0x80; /* Link Supervision Timeout Changed */
if (dev->features[6] & LMP_SIMPLE_PAIR) {
events[6] |= 0x01; /* IO Capability Request */
events[6] |= 0x02; /* IO Capability Response */
events[6] |= 0x04; /* User Confirmation Request */
events[6] |= 0x08; /* User Passkey Request */
events[6] |= 0x10; /* Remote OOB Data Request */
events[6] |= 0x20; /* Simple Pairing Complete */
events[7] |= 0x04; /* User Passkey Notification */
events[7] |= 0x08; /* Keypress Notification */
events[7] |= 0x10; /* Remote Host Supported
* Features Notification */
}
if (dev->features[4] & LMP_LE)
events[7] |= 0x20; /* LE Meta-Event */
hci_send_cmd(dev->sk, OGF_HOST_CTL, OCF_SET_EVENT_MASK,
sizeof(events), events);
}
static void start_adapter(int index)
{
struct dev_info *dev = &devs[index];
uint8_t inqmode;
uint16_t link_policy;
set_event_mask(index);
if (dev->features[6] & LMP_SIMPLE_PAIR)
init_ssp_mode(index);
inqmode = get_inquiry_mode(index);
if (inqmode)
write_inq_mode(index, inqmode);
if (dev->features[7] & LMP_INQ_TX_PWR)
hci_send_cmd(dev->sk, OGF_HOST_CTL,
OCF_READ_INQ_RESPONSE_TX_POWER_LEVEL, 0, NULL);
/* Set default link policy */
link_policy = main_opts.link_policy;
if (!(dev->features[0] & LMP_RSWITCH))
link_policy &= ~HCI_LP_RSWITCH;
if (!(dev->features[0] & LMP_HOLD))
link_policy &= ~HCI_LP_HOLD;
if (!(dev->features[0] & LMP_SNIFF))
link_policy &= ~HCI_LP_SNIFF;
if (!(dev->features[1] & LMP_PARK))
link_policy &= ~HCI_LP_PARK;
link_policy = htobs(link_policy);
hci_send_cmd(dev->sk, OGF_LINK_POLICY, OCF_WRITE_DEFAULT_LINK_POLICY,
sizeof(link_policy), &link_policy);
dev->current_cod = 0;
memset(dev->eir, 0, sizeof(dev->eir));
}
static int hciops_stop_inquiry(int index)
{
struct dev_info *dev = &devs[index];
DBG("hci%d", index);
if (hci_send_cmd(dev->sk, OGF_LINK_CTL, OCF_INQUIRY_CANCEL, 0, 0) < 0)
return -errno;
return 0;
}
static gboolean init_adapter(int index)
{
struct dev_info *dev = &devs[index];
struct btd_adapter *adapter = NULL;
gboolean existing_adapter = dev->registered;
uint8_t mode, on_mode;
gboolean pairable, discoverable;
if (!dev->registered) {
adapter = btd_manager_register_adapter(index);
if (adapter)
dev->registered = TRUE;
} else {
adapter = manager_find_adapter(&dev->bdaddr);
/* FIXME: manager_find_adapter should return a new ref */
btd_adapter_ref(adapter);
}
if (adapter == NULL)
return FALSE;
btd_adapter_get_mode(adapter, &mode, &on_mode, &pairable);
if (existing_adapter)
mode = on_mode;
if (mode == MODE_OFF) {
hciops_power_off(index);
goto done;
}
start_adapter(index);
btd_adapter_start(adapter);
discoverable = (mode == MODE_DISCOVERABLE);
hciops_set_discoverable(index, discoverable);
hciops_set_pairable(index, pairable);
if (dev->already_up)
hciops_stop_inquiry(index);
done:
btd_adapter_unref(adapter);
return TRUE;
}
static int hciops_encrypt_link(int index, bdaddr_t *dst, bt_hci_result_t cb,
gpointer user_data)
{
GIOChannel *io;
struct hci_cmd_data *cmd;
struct hci_conn_info_req *cr;
auth_requested_cp cp;
struct hci_filter nf;
int dd, err;
uint32_t link_mode;
uint16_t handle;
dd = hci_open_dev(index);
if (dd < 0)
return -errno;
cr = g_malloc0(sizeof(*cr) + sizeof(struct hci_conn_info));
cr->type = ACL_LINK;
bacpy(&cr->bdaddr, dst);
err = ioctl(dd, HCIGETCONNINFO, cr);
link_mode = cr->conn_info->link_mode;
handle = cr->conn_info->handle;
g_free(cr);
if (err < 0) {
err = -errno;
goto fail;
}
if (link_mode & HCI_LM_ENCRYPT) {
err = -EALREADY;
goto fail;
}
memset(&cp, 0, sizeof(cp));
cp.handle = htobs(handle);
if (hci_send_cmd(dd, OGF_LINK_CTL, OCF_AUTH_REQUESTED,
AUTH_REQUESTED_CP_SIZE, &cp) < 0) {
err = -errno;
goto fail;
}
cmd = g_new0(struct hci_cmd_data, 1);
cmd->handle = handle;
cmd->ocf = OCF_AUTH_REQUESTED;
cmd->cb = cb;
cmd->caller_data = user_data;
hci_filter_clear(&nf);
hci_filter_set_ptype(HCI_EVENT_PKT, &nf);
hci_filter_set_event(EVT_CMD_STATUS, &nf);
hci_filter_set_event(EVT_AUTH_COMPLETE, &nf);
hci_filter_set_event(EVT_ENCRYPT_CHANGE, &nf);
if (setsockopt(dd, SOL_HCI, HCI_FILTER, &nf, sizeof(nf)) < 0) {
err = -errno;
g_free(cmd);
goto fail;
}
io = g_io_channel_unix_new(dd);
g_io_channel_set_close_on_unref(io, FALSE);
g_io_add_watch_full(io, G_PRIORITY_DEFAULT,
G_IO_HUP | G_IO_ERR | G_IO_NVAL | G_IO_IN,
hci_event_watch, cmd, g_free);
g_io_channel_unref(io);
return 0;
fail:
close(dd);
return err;
}
static int hciops_set_did(int index, uint16_t vendor, uint16_t product,
uint16_t version)
{
struct dev_info *dev = &devs[index];
dev->did_vendor = vendor;
dev->did_product = product;
dev->did_version = version;
return 0;
}
/* End async HCI command handling */
/* Start of HCI event callbacks */
static gint conn_handle_cmp(gconstpointer a, gconstpointer b)
{
const struct bt_conn *conn = a;
uint16_t handle = *((const uint16_t *) b);
return (int) conn->handle - (int) handle;
}
static struct bt_conn *find_conn_by_handle(struct dev_info *dev,
uint16_t handle)
{
GSList *match;
match = g_slist_find_custom(dev->connections, &handle,
conn_handle_cmp);
if (match)
return match->data;
return NULL;
}
static gint conn_bdaddr_cmp(gconstpointer a, gconstpointer b)
{
const struct bt_conn *conn = a;
const bdaddr_t *bdaddr = b;
return bacmp(&conn->bdaddr, bdaddr);
}
static struct bt_conn *find_connection(struct dev_info *dev, bdaddr_t *bdaddr)
{
GSList *match;
match = g_slist_find_custom(dev->connections, bdaddr, conn_bdaddr_cmp);
if (match)
return match->data;
return NULL;
}
static struct bt_conn *get_connection(struct dev_info *dev, bdaddr_t *bdaddr)
{
struct bt_conn *conn;
conn = find_connection(dev, bdaddr);
if (conn)
return conn;
conn = g_new0(struct bt_conn, 1);
conn->dev = dev;
conn->loc_cap = dev->io_capability;
conn->loc_auth = 0xff;
conn->rem_auth = 0xff;
bacpy(&conn->bdaddr, bdaddr);
dev->connections = g_slist_append(dev->connections, conn);
return conn;
}
static int get_handle(int index, bdaddr_t *bdaddr, uint16_t *handle)
{
struct dev_info *dev = &devs[index];
struct bt_conn *conn;
char addr[18];
ba2str(bdaddr, addr);
DBG("hci%d dba %s", index, addr);
conn = find_connection(dev, bdaddr);
if (conn == NULL)
return -ENOENT;
*handle = conn->handle;
return 0;
}
static int disconnect_addr(int index, bdaddr_t *dba, uint8_t reason)
{
disconnect_cp cp;
uint16_t handle;
int err;
err = get_handle(index, dba, &handle);
if (err < 0)
return err;
memset(&cp, 0, sizeof(cp));
cp.handle = htobs(handle);
cp.reason = reason;
if (hci_send_cmd(devs[index].sk, OGF_LINK_CTL, OCF_DISCONNECT,
DISCONNECT_CP_SIZE, &cp) < 0)
return -errno;
return 0;
}
static void bonding_complete(struct dev_info *dev, struct bt_conn *conn,
uint8_t status)
{
DBG("status 0x%02x", status);
if (conn->io != NULL) {
/* bonding_connect_cb takes care of the successul case */
if (status != 0)
g_io_channel_shutdown(conn->io, TRUE, NULL);
g_io_channel_unref(conn->io);
conn->io = NULL;
}
conn->bonding_initiator = FALSE;
btd_event_bonding_complete(&dev->bdaddr, &conn->bdaddr, status);
}
static int get_auth_info(int index, bdaddr_t *bdaddr, uint8_t *auth)
{
struct dev_info *dev = &devs[index];
struct hci_auth_info_req req;
char addr[18];
ba2str(bdaddr, addr);
DBG("hci%d dba %s", index, addr);
memset(&req, 0, sizeof(req));
bacpy(&req.bdaddr, bdaddr);
if (ioctl(dev->sk, HCIGETAUTHINFO, (unsigned long) &req) < 0)
return -errno;
if (auth)
*auth = req.type;
return 0;
}
/* Link Key handling */
static void link_key_request(int index, bdaddr_t *dba)
{
struct dev_info *dev = &devs[index];
struct link_key_info *key_info;
struct bt_conn *conn;
GSList *match;
char da[18];
ba2str(dba, da);
DBG("hci%d dba %s", index, da);
conn = get_connection(dev, dba);
if (conn->handle == 0)
conn->secmode3 = TRUE;
get_auth_info(index, dba, &conn->loc_auth);
DBG("kernel auth requirements = 0x%02x", conn->loc_auth);
match = g_slist_find_custom(dev->keys, dba, (GCompareFunc) bacmp);
if (match)
key_info = match->data;
else
key_info = NULL;
DBG("Matching key %s", key_info ? "found" : "not found");
if (key_info == NULL || (!dev->debug_keys && key_info->type == 0x03)) {
/* Link key not found */
hci_send_cmd(dev->sk, OGF_LINK_CTL, OCF_LINK_KEY_NEG_REPLY,
6, dba);
return;
}
/* Link key found */
DBG("link key type 0x%02x", key_info->type);
/* Don't use unauthenticated combination keys if MITM is
* required */
if (key_info->type == 0x04 && conn->loc_auth != 0xff &&
(conn->loc_auth & 0x01))
hci_send_cmd(dev->sk, OGF_LINK_CTL, OCF_LINK_KEY_NEG_REPLY,
6, dba);
else {
link_key_reply_cp lr;
memcpy(lr.link_key, key_info->key, 16);
bacpy(&lr.bdaddr, dba);
hci_send_cmd(dev->sk, OGF_LINK_CTL, OCF_LINK_KEY_REPLY,
LINK_KEY_REPLY_CP_SIZE, &lr);
}
}
static void link_key_notify(int index, void *ptr)
{
struct dev_info *dev = &devs[index];
evt_link_key_notify *evt = ptr;
bdaddr_t *dba = &evt->bdaddr;
struct link_key_info *key_info;
uint8_t old_key_type, key_type;
struct bt_conn *conn;
GSList *match;
char da[18];
uint8_t status = 0;
ba2str(dba, da);
DBG("hci%d dba %s type %d", index, da, evt->key_type);
conn = get_connection(dev, &evt->bdaddr);
match = g_slist_find_custom(dev->keys, dba, (GCompareFunc) bacmp);
if (match)
key_info = match->data;
else
key_info = NULL;
if (key_info == NULL) {
key_info = g_new0(struct link_key_info, 1);
bacpy(&key_info->bdaddr, &evt->bdaddr);
old_key_type = 0xff;
} else {
dev->keys = g_slist_remove(dev->keys, key_info);
old_key_type = key_info->type;
}
memcpy(key_info->key, evt->link_key, sizeof(evt->link_key));
key_info->type = evt->key_type;
key_info->pin_len = dev->pin_length;
key_type = evt->key_type;
DBG("key type 0x%02x old key type 0x%02x", key_type, old_key_type);
DBG("local auth 0x%02x and remote auth 0x%02x",
conn->loc_auth, conn->rem_auth);
if (key_type == 0x06) {
/* Some buggy controller combinations generate a changed
* combination key for legacy pairing even when there's no
* previous key */
if (conn->rem_auth == 0xff && old_key_type == 0xff)
key_type = 0x00;
else if (old_key_type != 0xff)
key_type = old_key_type;
else
/* This is Changed Combination Link Key for
* a temporary link key.*/
goto done;
}
key_info->type = key_type;
/* Skip the storage check if this is a debug key */
if (key_type == 0x03)
goto done;
/* Store the link key persistently if one of the following is true:
* 1. this is a legacy link key
* 2. this is a changed combination key and there was a previously
* stored one
* 3. neither local nor remote side had no-bonding as a requirement
* 4. the local side had dedicated bonding as a requirement
* 5. the remote side is using dedicated bonding since in that case
* also the local requirements are set to dedicated bonding
* If none of the above match only keep the link key around for
* this connection and set the temporary flag for the device.
*/
if (key_type < 0x03 || (key_type == 0x06 && old_key_type != 0xff) ||
(conn->loc_auth > 0x01 && conn->rem_auth > 0x01) ||
(conn->loc_auth == 0x02 || conn->loc_auth == 0x03) ||
(conn->rem_auth == 0x02 || conn->rem_auth == 0x03)) {
int err;