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Bluetooth: controller: Add RL filter

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In order for privacy to work correctly with and without peer IRKs, an
additional hardware filter is required to help match the peer device in
the case address resolution is not possible for a peer since the Host
has not provided a peer IRK for it.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2017-06-25 17:52:44 +02:00 • committed by Johan Hedberg
commit bd31ad11de
1 changed files with 23 additions and 3 deletions
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26
subsys/bluetooth/controller/ll_sw/ll_filter.c
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@ -63,6 +63,9 @@ static struct rl_dev {
static u8_t peer_irks[CONFIG_BLUETOOTH_CONTROLLER_RL_SIZE][16]; static u8_t peer_irks[CONFIG_BLUETOOTH_CONTROLLER_RL_SIZE][16];
static u8_t peer_irk_count; static u8_t peer_irk_count;
/* Hardware filter for the resolving list */
static struct ll_filter rl_filter;
#define DEFAULT_RPA_TIMEOUT_MS 900 * 1000 #define DEFAULT_RPA_TIMEOUT_MS 900 * 1000
u32_t rpa_timeout_ms; u32_t rpa_timeout_ms;
s64_t rpa_last_ms; s64_t rpa_last_ms;
@ -271,6 +274,21 @@ static void filter_wl_update(void)
} }
} }
static void filter_rl_update(void)
{
int i;
/* No whitelist: populate filter from rl peers */
filter_clear(&rl_filter);
for (i = 0; i < CONFIG_BLUETOOTH_CONTROLLER_RL_SIZE; i++) {
if (!rl[i].pirk) {
filter_insert(&rl_filter, i, rl[i].id_addr_type,
rl[i].id_addr.val);
}
}
}
void ll_filters_adv_update(u8_t adv_fp) void ll_filters_adv_update(u8_t adv_fp)
{ {
/* enabling advertising */ /* enabling advertising */
@ -280,7 +298,8 @@ void ll_filters_adv_update(u8_t adv_fp)
} }
if (rl_enable && !radio_scan_is_enabled()) { if (rl_enable && !radio_scan_is_enabled()) {
/*@todo: rl not in use, update resolving list LUT */ /* rl not in use, update resolving list LUT */
filter_rl_update();
} }
} }
@ -292,8 +311,9 @@ void ll_filters_scan_update(u8_t scan_fp)
filter_wl_update(); filter_wl_update();
} }
if (rl_enable && !radio_scan_is_enabled()) { if (rl_enable && !radio_adv_is_enabled()) {
/*@todo: rl not in use, update resolving list LUT */ /* rl not in use, update resolving list LUT */
filter_rl_update();
} }
} }