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Bluetooth: controller: Move access address helper to util.c

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Move the access address helper function to util.c file.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2020-02-07 11:36:54 +05:30 • committed by Carles Cufí
commit 5c512d6e9a
3 changed files with 183 additions and 178 deletions
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178
subsys/bluetooth/controller/ll_sw/ull_master.c
View file

@ -51,7 +51,6 @@
static void ticker_op_stop_scan_cb(uint32_t status, void *params);
static void ticker_op_cb(uint32_t status, void *params);
static inline void access_addr_get(uint8_t access_addr[]);
static inline void conn_release(struct ll_scan_set *scan);
uint8_t ll_create_connection(uint16_t scan_interval, uint16_t scan_window,
@ -65,7 +64,6 @@ uint8_t ll_create_connection(uint16_t scan_interval, uint16_t scan_window,
struct lll_scan *lll;
struct ll_conn *conn;
memq_link_t *link;
uint8_t access_addr[4];
uint8_t hop;
int err;
@ -100,10 +98,10 @@ uint8_t ll_create_connection(uint16_t scan_interval, uint16_t scan_window,
conn_lll = &conn->lll;
access_addr_get(access_addr);
memcpy(conn_lll->access_addr, &access_addr,
sizeof(conn_lll->access_addr));
util_rand(&conn_lll->crc_init[0], 3);
err = util_aa_to_le32(conn_lll->access_addr);
LL_ASSERT(!err);
util_rand(conn_lll->crc_init, sizeof(conn_lll->crc_init));
conn_lll->handle = 0xFFFF;
conn_lll->interval = interval;
@ -691,174 +689,6 @@ static void ticker_op_cb(uint32_t status, void *params)
LL_ASSERT(status == TICKER_STATUS_SUCCESS);
}
/** @brief Prepare access address as per BT Spec.
*
* - It shall have no more than six consecutive zeros or ones.
* - It shall not be the advertising channel packets' Access Address.
* - It shall not be a sequence that differs from the advertising channel
* packets Access Address by only one bit.
* - It shall not have all four octets equal.
* - It shall have no more than 24 transitions.
* - It shall have a minimum of two transitions in the most significant six
* bits.
*
* LE Coded PHY requirements:
* - It shall have at least three ones in the least significant 8 bits.
* - It shall have no more than eleven transitions in the least significant 16
* bits.
*/
static inline void access_addr_get(uint8_t access_addr[])
{
#if defined(CONFIG_BT_CTLR_PHY_CODED)
uint8_t transitions_lsb16;
uint8_t ones_count_lsb8;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
uint8_t consecutive_cnt;
uint8_t consecutive_bit;
uint32_t adv_aa_check;
uint32_t aa;
uint8_t transitions;
uint8_t bit_idx;
uint8_t retry;
retry = 3U;
again:
LL_ASSERT(retry);
retry--;
util_rand(access_addr, 4);
aa = sys_get_le32(access_addr);
bit_idx = 31U;
transitions = 0U;
consecutive_cnt = 1U;
#if defined(CONFIG_BT_CTLR_PHY_CODED)
ones_count_lsb8 = 0U;
transitions_lsb16 = 0U;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
consecutive_bit = (aa >> bit_idx) & 0x01;
while (bit_idx--) {
#if defined(CONFIG_BT_CTLR_PHY_CODED)
uint8_t transitions_lsb16_prev = transitions_lsb16;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
uint8_t consecutive_cnt_prev = consecutive_cnt;
uint8_t transitions_prev = transitions;
uint8_t bit;
bit = (aa >> bit_idx) & 0x01;
if (bit == consecutive_bit) {
consecutive_cnt++;
} else {
consecutive_cnt = 1U;
consecutive_bit = bit;
transitions++;
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 15) {
transitions_lsb16++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if ((bit_idx < 8) && consecutive_bit) {
ones_count_lsb8++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
/* It shall have no more than six consecutive zeros or ones. */
/* It shall have a minimum of two transitions in the most
* significant six bits.
*/
if ((consecutive_cnt > 6) ||
#if defined(CONFIG_BT_CTLR_PHY_CODED)
(!consecutive_bit && (((bit_idx < 6) &&
(ones_count_lsb8 < 1)) ||
((bit_idx < 5) &&
(ones_count_lsb8 < 2)) ||
((bit_idx < 4) &&
(ones_count_lsb8 < 3)))) ||
#endif /* CONFIG_BT_CTLR_PHY_CODED */
((consecutive_cnt < 6) &&
(((bit_idx < 29) && (transitions < 1)) ||
((bit_idx < 28) && (transitions < 2))))) {
if (consecutive_bit) {
consecutive_bit = 0U;
aa &= ~BIT(bit_idx);
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 8) {
ones_count_lsb8--;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
} else {
consecutive_bit = 1U;
aa |= BIT(bit_idx);
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 8) {
ones_count_lsb8++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
if (transitions != transitions_prev) {
consecutive_cnt = consecutive_cnt_prev;
transitions = transitions_prev;
} else {
consecutive_cnt = 1U;
transitions++;
}
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 15) {
if (transitions_lsb16 !=
transitions_lsb16_prev) {
transitions_lsb16 =
transitions_lsb16_prev;
} else {
transitions_lsb16++;
}
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
/* It shall have no more than 24 transitions
* It shall have no more than eleven transitions in the least
* significant 16 bits.
*/
if ((transitions > 24) ||
#if defined(CONFIG_BT_CTLR_PHY_CODED)
(transitions_lsb16 > 11) ||
#endif /* CONFIG_BT_CTLR_PHY_CODED */
0) {
if (consecutive_bit) {
aa &= ~(BIT(bit_idx + 1) - 1);
} else {
aa |= (BIT(bit_idx + 1) - 1);
}
break;
}
}
/* It shall not be the advertising channel packets Access Address.
* It shall not be a sequence that differs from the advertising channel
* packets Access Address by only one bit.
*/
adv_aa_check = aa ^ PDU_AC_ACCESS_ADDR;
if (util_ones_count_get((uint8_t *)&adv_aa_check,
sizeof(adv_aa_check)) <= 1) {
goto again;
}
/* It shall not have all four octets equal. */
if (!((aa & 0xFFFF) ^ (aa >> 16)) &&
!((aa & 0xFF) ^ (aa >> 24))) {
goto again;
}
sys_put_le32(aa, access_addr);
}
static inline void conn_release(struct ll_scan_set *scan)
{
struct lll_conn *lll = scan->lll.conn;

175
subsys/bluetooth/controller/util/util.c
View file

@ -6,9 +6,13 @@
*/
#include <zephyr/types.h>
#include <sys/byteorder.h>
#include <drivers/entropy.h>
#include "util.h"
#include "pdu.h"
/**
* @brief Population count: Count the number of bits set to 1
* @details
@ -55,3 +59,174 @@ int util_rand(void *buf, size_t len)
return entropy_get_entropy(dev, (uint8_t *)buf, len);
}
/** @brief Prepare access address as per BT Spec.
*
* - It shall have no more than six consecutive zeros or ones.
* - It shall not be the advertising channel packets' Access Address.
* - It shall not be a sequence that differs from the advertising channel
* packets Access Address by only one bit.
* - It shall not have all four octets equal.
* - It shall have no more than 24 transitions.
* - It shall have a minimum of two transitions in the most significant six
* bits.
*
* LE Coded PHY requirements:
* - It shall have at least three ones in the least significant 8 bits.
* - It shall have no more than eleven transitions in the least significant 16
* bits.
*/
int util_aa_to_le32(uint8_t *dst)
{
#if defined(CONFIG_BT_CTLR_PHY_CODED)
uint8_t transitions_lsb16;
uint8_t ones_count_lsb8;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
uint8_t consecutive_cnt;
uint8_t consecutive_bit;
uint32_t adv_aa_check;
uint32_t aa;
uint8_t transitions;
uint8_t bit_idx;
uint8_t retry;
retry = 3U;
again:
if (!retry) {
return -EFAULT;
}
retry--;
util_rand((void *)&aa, sizeof(aa));
bit_idx = 31U;
transitions = 0U;
consecutive_cnt = 1U;
#if defined(CONFIG_BT_CTLR_PHY_CODED)
ones_count_lsb8 = 0U;
transitions_lsb16 = 0U;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
consecutive_bit = (aa >> bit_idx) & 0x01;
while (bit_idx--) {
#if defined(CONFIG_BT_CTLR_PHY_CODED)
uint8_t transitions_lsb16_prev = transitions_lsb16;
#endif /* CONFIG_BT_CTLR_PHY_CODED */
uint8_t consecutive_cnt_prev = consecutive_cnt;
uint8_t transitions_prev = transitions;
uint8_t bit;
bit = (aa >> bit_idx) & 0x01;
if (bit == consecutive_bit) {
consecutive_cnt++;
} else {
consecutive_cnt = 1U;
consecutive_bit = bit;
transitions++;
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 15) {
transitions_lsb16++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if ((bit_idx < 8) && consecutive_bit) {
ones_count_lsb8++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
/* It shall have no more than six consecutive zeros or ones. */
/* It shall have a minimum of two transitions in the most
* significant six bits.
*/
if ((consecutive_cnt > 6) ||
#if defined(CONFIG_BT_CTLR_PHY_CODED)
(!consecutive_bit && (((bit_idx < 6) &&
(ones_count_lsb8 < 1)) ||
((bit_idx < 5) &&
(ones_count_lsb8 < 2)) ||
((bit_idx < 4) &&
(ones_count_lsb8 < 3)))) ||
#endif /* CONFIG_BT_CTLR_PHY_CODED */
((consecutive_cnt < 6) &&
(((bit_idx < 29) && (transitions < 1)) ||
((bit_idx < 28) && (transitions < 2))))) {
if (consecutive_bit) {
consecutive_bit = 0U;
aa &= ~BIT(bit_idx);
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 8) {
ones_count_lsb8--;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
} else {
consecutive_bit = 1U;
aa |= BIT(bit_idx);
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 8) {
ones_count_lsb8++;
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
if (transitions != transitions_prev) {
consecutive_cnt = consecutive_cnt_prev;
transitions = transitions_prev;
} else {
consecutive_cnt = 1U;
transitions++;
}
#if defined(CONFIG_BT_CTLR_PHY_CODED)
if (bit_idx < 15) {
if (transitions_lsb16 !=
transitions_lsb16_prev) {
transitions_lsb16 =
transitions_lsb16_prev;
} else {
transitions_lsb16++;
}
}
#endif /* CONFIG_BT_CTLR_PHY_CODED */
}
/* It shall have no more than 24 transitions
* It shall have no more than eleven transitions in the least
* significant 16 bits.
*/
if ((transitions > 24) ||
#if defined(CONFIG_BT_CTLR_PHY_CODED)
(transitions_lsb16 > 11) ||
#endif /* CONFIG_BT_CTLR_PHY_CODED */
0) {
if (consecutive_bit) {
aa &= ~(BIT(bit_idx + 1) - 1);
} else {
aa |= (BIT(bit_idx + 1) - 1);
}
break;
}
}
/* It shall not be the advertising channel packets Access Address.
* It shall not be a sequence that differs from the advertising channel
* packets Access Address by only one bit.
*/
adv_aa_check = aa ^ PDU_AC_ACCESS_ADDR;
if (util_ones_count_get((uint8_t *)&adv_aa_check,
sizeof(adv_aa_check)) <= 1) {
goto again;
}
/* It shall not have all four octets equal. */
if (!((aa & 0xFFFF) ^ (aa >> 16)) &&
!((aa & 0xFF) ^ (aa >> 24))) {
goto again;
}
sys_put_le32(aa, dst);
return 0;
}

8
subsys/bluetooth/controller/util/util.h
View file

@ -1,10 +1,12 @@
/*
* Copyright (c) 2016 Nordic Semiconductor ASA
* Copyright (c) 2016-2020 Nordic Semiconductor ASA
* Copyright (c) 2016 Vinayak Kariappa Chettimada
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stddef.h>
#ifndef DOUBLE_BUFFER_SIZE
#define DOUBLE_BUFFER_SIZE 2
#endif
@ -13,8 +15,6 @@
#define TRIPLE_BUFFER_SIZE 3
#endif
#include <stddef.h>
uint8_t util_ones_count_get(uint8_t *octets, uint8_t octets_len);
int util_rand(void *buf, size_t len);
int util_aa_to_le32(uint8_t *dst);