diff options
Diffstat (limited to 'stack/btm/btm_ble_addr.c')
| -rw-r--r-- | stack/btm/btm_ble_addr.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/stack/btm/btm_ble_addr.c b/stack/btm/btm_ble_addr.c new file mode 100644 index 0000000..04872f9 --- /dev/null +++ b/stack/btm/btm_ble_addr.c @@ -0,0 +1,383 @@ +/****************************************************************************** + * + * Copyright (C) 1999-2012 Broadcom Corporation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ******************************************************************************/ + +/****************************************************************************** + * + * This file contains functions for BLE address management. + * + ******************************************************************************/ + +#include <string.h> + +#include "bt_types.h" +#include "hcimsgs.h" +#include "btu.h" +#include "btm_int.h" + + +#if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE) + #include "smp_api.h" + #define BTM_BLE_PRIVATE_ADDR_INT 900 /* 15 minutes minimum for random address refreshing */ + +/******************************************************************************* +** +** Function btm_gen_resolve_paddr_cmpl +** +** Description This is callback functioin when resolvable private address +** generation is complete. +** +** Returns void +** +*******************************************************************************/ +static void btm_gen_resolve_paddr_cmpl(tSMP_ENC *p) +{ + tBTM_LE_RANDOM_CB *p_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + tBTM_BLE_INQ_CB *p_inq_cb = &btm_cb.ble_ctr_cb.inq_var; + BTM_TRACE_EVENT0 ("btm_gen_resolve_paddr_cmpl"); + if (p && p->param_buf) + { + /* get the high bytes of the random address */ + p_cb->private_addr[2] = p->param_buf[0]; + p_cb->private_addr[1] = p->param_buf[1]; + p_cb->private_addr[0] = p->param_buf[2]; + /* mask off the 1st MSB */ + p_cb->private_addr[0] &= 0xfe; + /* set the 2nd MSB to be 1 */ + p_cb->private_addr[0] |= 0x02; + /* set it to controller */ + btsnd_hcic_ble_set_random_addr(p_cb->private_addr); + + p_inq_cb->own_addr_type = BLE_ADDR_RANDOM; + + /* start a periodical timer to refresh random addr */ + btu_stop_timer(&p_cb->raddr_timer_ent); + btu_start_timer (&p_cb->raddr_timer_ent, BTU_TTYPE_BLE_RANDOM_ADDR, + BTM_BLE_PRIVATE_ADDR_INT); + + /* if adv is active, restart adv with new private addr */ + if (p_inq_cb->adv_mode == BTM_BLE_ADV_ENABLE) + { + btsnd_hcic_ble_set_adv_enable (BTM_BLE_ADV_DISABLE); + + btsnd_hcic_ble_write_adv_params (p_inq_cb->adv_interval_min, + p_inq_cb->adv_interval_max, + p_inq_cb->evt_type, + p_inq_cb->own_addr_type, + p_inq_cb->direct_bda.type, + p_inq_cb->direct_bda.bda, + p_inq_cb->adv_chnl_map, + p_inq_cb->afp); + } + } + else + { + /* random address set failure */ + BTM_TRACE_DEBUG0("set random address failed"); + } +} +/******************************************************************************* +** +** Function btm_gen_resolve_paddr_low +** +** Description This function is called when random address has generate the +** random number base for low 3 byte bd address. +** +** Returns void +** +*******************************************************************************/ +static void btm_gen_resolve_paddr_low(tBTM_RAND_ENC *p) +{ +#if (BLE_INCLUDED == TRUE && SMP_INCLUDED == TRUE) + tBTM_LE_RANDOM_CB *p_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + tSMP_ENC output; + + BTM_TRACE_EVENT0 ("btm_gen_resolve_paddr_low"); + if (p && p->param_buf) + { + p_cb->private_addr[5] = p->param_buf[0]; + p_cb->private_addr[4] = p->param_buf[1]; + p_cb->private_addr[3] = p->param_buf[2]; + + /* encrypt with ur IRK */ + if (!SMP_Encrypt(btm_cb.devcb.id_keys.irk, BT_OCTET16_LEN, p->param_buf, 3, &output)) + { + btm_gen_resolve_paddr_cmpl(NULL); + } + else + { + btm_gen_resolve_paddr_cmpl(&output); + } + } +#endif +} +/******************************************************************************* +** +** Function btm_gen_resolvable_private_addr +** +** Description This function generate a resolvable private address. +** +** Returns void +** +*******************************************************************************/ +void btm_gen_resolvable_private_addr (void) +{ + BTM_TRACE_EVENT0 ("btm_gen_resolvable_private_addr"); + /* generate 3B rand as BD LSB, SRK with it, get BD MSB */ + if (!btsnd_hcic_ble_rand((void *)btm_gen_resolve_paddr_low)) + btm_gen_resolve_paddr_cmpl(NULL); +} +/******************************************************************************* +** +** Function btm_gen_non_resolve_paddr_cmpl +** +** Description This is the callback function when non-resolvable private +** function is generated and write to controller. +** +** Returns void +** +*******************************************************************************/ +static void btm_gen_non_resolve_paddr_cmpl(tBTM_RAND_ENC *p) +{ + tBTM_LE_RANDOM_CB *p_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + UINT8 *pp; + BTM_TRACE_EVENT0 ("btm_gen_non_resolve_paddr_cmpl"); + if (p && p->param_buf) + { + pp = p->param_buf; + STREAM_TO_BDADDR(p_cb->private_addr, pp); + /* mask off the 2 MSB */ + p_cb->private_addr[0] &= 0xfc; + /* write to controller */ + btsnd_hcic_ble_set_random_addr(p_cb->private_addr); + + btm_cb.ble_ctr_cb.inq_var.own_addr_type = BLE_ADDR_RANDOM; + } + else + { + BTM_TRACE_DEBUG0("btm_gen_non_resolvable_private_addr failed"); + } +} +/******************************************************************************* +** +** Function btm_gen_non_resolvable_private_addr +** +** Description This function generate a non-resolvable private address. +** +** +** Returns void +** +*******************************************************************************/ +void btm_gen_non_resolvable_private_addr (void) +{ + BTM_TRACE_EVENT0 ("btm_gen_non_resolvable_private_addr"); + if (!btsnd_hcic_ble_rand((void *)btm_gen_non_resolve_paddr_cmpl)) + { + btm_gen_non_resolve_paddr_cmpl(NULL); + } +} + #if SMP_INCLUDED == TRUE +/******************************************************************************* +** Utility functions for Random address resolving +*******************************************************************************/ +/******************************************************************************* +** +** Function btm_ble_resolve_address_cmpl +** +** Description This function sends the random address resolving complete +** callback. +** +** Returns None. +** +*******************************************************************************/ +static void btm_ble_resolve_address_cmpl(void) +{ + tBTM_LE_RANDOM_CB *p_mgnt_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + tBTM_SEC_DEV_REC *p_dev_rec = NULL; + + BTM_TRACE_EVENT0 ("btm_ble_resolve_address_cmpl"); + if (p_mgnt_cb->index < BTM_SEC_MAX_DEVICE_RECORDS) + p_dev_rec = &btm_cb.sec_dev_rec[p_mgnt_cb->index]; + + p_mgnt_cb->busy = FALSE; + + (* p_mgnt_cb->p_resolve_cback)(p_dev_rec, p_mgnt_cb->p); +} +/******************************************************************************* +** +** Function btm_ble_proc_resolve_x +** +** Description This function compares the X with random address 3 MSO bytes +** to find a match, if not match, continue for next record. +** +** Returns None. +** +*******************************************************************************/ +static BOOLEAN btm_ble_proc_resolve_x(tSMP_ENC *p) +{ + tBTM_LE_RANDOM_CB *p_mgnt_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + UINT8 comp[3]; + BTM_TRACE_EVENT0 ("btm_ble_proc_resolve_x"); + /* compare the hash with 3 LSB of bd address */ + comp[0] = p_mgnt_cb->random_bda[5]; + comp[1] = p_mgnt_cb->random_bda[4]; + comp[2] = p_mgnt_cb->random_bda[3]; + + if (p && p->param_buf) + { + if (!memcmp(p->param_buf, &comp[0], 3)) + { + /* match is found */ + BTM_TRACE_EVENT0 ("match is found"); + btm_ble_resolve_address_cmpl(); + return TRUE; + } + } + return FALSE; +} +/******************************************************************************* +** +** Function btm_ble_match_random_bda +** +** Description This function match the random address to the appointed device +** record, starting from calculating IRK. If record index exceed +** the maximum record number, matching failed and send callback. +** +** Returns None. +** +*******************************************************************************/ +static BOOLEAN btm_ble_match_random_bda(UINT16 rec_index) +{ +#if (BLE_INCLUDED == TRUE && SMP_INCLUDED == TRUE) + tBTM_SEC_DEV_REC *p_dev_rec; + tBTM_LE_RANDOM_CB *p_mgnt_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + UINT8 rand[3]; + tSMP_ENC output; + + /* use the 3 MSB of bd address as prand */ + rand[0] = p_mgnt_cb->random_bda[2]; + rand[1] = p_mgnt_cb->random_bda[1]; + rand[2] = p_mgnt_cb->random_bda[0]; + + BTM_TRACE_EVENT1("btm_ble_match_random_bda rec_index = %d", rec_index); + + if (rec_index < BTM_SEC_MAX_DEVICE_RECORDS) + { + p_dev_rec = &btm_cb.sec_dev_rec[rec_index]; + + BTM_TRACE_ERROR2("sec_flags = %02x device_type = %d", p_dev_rec->sec_flags, p_dev_rec->device_type); + + if ((p_dev_rec->device_type == BT_DEVICE_TYPE_BLE) && + (p_dev_rec->ble.key_type & BTM_LE_KEY_PID)) + { + /* generate X = E irk(R0, R1, R2) and R is random address 3 LSO */ + SMP_Encrypt(p_dev_rec->ble.keys.irk, BT_OCTET16_LEN, + &rand[0], 3, &output); + return btm_ble_proc_resolve_x(&output); + } + else + { + // not completed + return FALSE; + } + } + else /* no match found */ + { + btm_ble_resolve_address_cmpl(); + return TRUE; + } +#endif +} + +/******************************************************************************* +** +** Function btm_ble_resolve_random_addr +** +** Description This function is called to resolve a random address. +** +** Returns pointer to the security record of the device whom a random +** address is matched to. +** +*******************************************************************************/ +void btm_ble_resolve_random_addr(BD_ADDR random_bda, tBTM_BLE_RESOLVE_CBACK * p_cback, void *p) +{ + tBTM_LE_RANDOM_CB *p_mgnt_cb = &btm_cb.ble_ctr_cb.addr_mgnt_cb; + + BTM_TRACE_EVENT0 ("btm_ble_resolve_random_addr"); + if ( !p_mgnt_cb->busy) + { + p_mgnt_cb->p = p; + p_mgnt_cb->busy = TRUE; + p_mgnt_cb->index = 0; + p_mgnt_cb->p_resolve_cback = p_cback; + memcpy(p_mgnt_cb->random_bda, random_bda, BD_ADDR_LEN); + /* start to resolve random address */ + /* check for next security record */ + while (TRUE) + { + if (btm_ble_match_random_bda(p_mgnt_cb->index++)) + { + // match found or went through the list + break; + } + } + } + else + (*p_cback)(NULL, p); +} + #endif +/******************************************************************************* +** address mapping between pseudo address and real connection address +*******************************************************************************/ +/******************************************************************************* +** +** Function btm_ble_map_bda_to_conn_bda +** +** Description This function map a BD address to the real connection address +** and return the connection address type. +*******************************************************************************/ +tBLE_ADDR_TYPE btm_ble_map_bda_to_conn_bda(BD_ADDR bd_addr) +{ + tBTM_SEC_DEV_REC *p_dev_rec = NULL; + BTM_TRACE_EVENT0 ("btm_ble_map_bda_to_conn_bda"); + if ((p_dev_rec = btm_find_dev (bd_addr)) != NULL && + p_dev_rec->device_type == BT_DEVICE_TYPE_BLE) + { + if (p_dev_rec->ble.ble_addr_type != BLE_ADDR_PUBLIC) + { + memcpy(bd_addr, p_dev_rec->ble.static_addr, BD_ADDR_LEN); + } + return p_dev_rec->ble.ble_addr_type; + } + else + return BLE_ADDR_PUBLIC; +} +/******************************************************************************* +** +** Function btm_ble_map_bda_to_pseudo_bda +** +** Description This function map a BD address to a pseudo address when the +** address given is a random address. +** +*******************************************************************************/ +void btm_ble_map_bda_to_pseudo_bda(BD_ADDR bd_addr) +{ + BTM_TRACE_EVENT0 ("btm_ble_map_bda_to_pseudo_bda"); +} +#endif + + |