Return-Path: From: Michael Janssen To: linux-bluetooth@vger.kernel.org Cc: Michael Janssen Subject: [BlueZ v7 08/10] shared/ad: implement bt_ad_generate Date: Tue, 31 Mar 2015 10:24:02 -0700 Message-Id: <1427822644-39009-9-git-send-email-jamuraa@chromium.org> In-Reply-To: <1427822644-39009-1-git-send-email-jamuraa@chromium.org> References: <1427822644-39009-1-git-send-email-jamuraa@chromium.org> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Implements the function to provide a raw version of the advertising data packet for passing to the kernel. --- src/shared/ad.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 240 insertions(+), 4 deletions(-) diff --git a/src/shared/ad.c b/src/shared/ad.c index 8e38d26..be8e8dc 100644 --- a/src/shared/ad.c +++ b/src/shared/ad.c @@ -22,6 +22,21 @@ #include "src/shared/queue.h" #include "src/shared/util.h" +#define MAX_ADV_DATA_LEN 31 + +#define LE_AD_TYPE_UUID16_ALL 0x03 /* 16-bit service UUIDs, all */ +#define LE_AD_TYPE_UUID32_ALL 0x05 /* 16-bit service UUIDs, all */ +#define LE_AD_TYPE_UUID128_ALL 0x07 /* 16-bit service UUIDs, all */ +#define LE_AD_TYPE_SOLICIT16 0x14 /* 16-bit service solic. UUIDs */ +#define LE_AD_TYPE_SOLICIT32 0x1F /* 32-bit service solic. UUIDs */ +#define LE_AD_TYPE_SOLICIT128 0x15 /* 128-bit service solic. UUIDs */ +#define LE_AD_TYPE_SVC_DATA16 0x16 /* Service Data - 16-bit UUID */ +#define LE_AD_TYPE_SVC_DATA32 0x20 /* Service Data - 32-bit UUID */ +#define LE_AD_TYPE_SVC_DATA128 0x21 /* Service Data - 128-bit UUID */ +#define LE_AD_TYPE_PUB_TRGT_ADDR 0x17 /* Public Target Address */ +#define LE_AD_TYPE_RND_TRGT_ADDR 0x18 /* Random Target Address */ +#define LE_AD_TYPE_MANUF_DATA 0xFF /* Manufacturer Specific Data */ + struct bt_ad { int ref_count; struct queue *service_uuids; @@ -136,10 +151,231 @@ void bt_ad_unref(struct bt_ad *ad) free(ad); } +static uint8_t uuid_list_length(struct queue *uuid_queue) +{ + bool uuid16_included = false; + bool uuid32_included = false; + bool uuid128_included = false; + uint8_t length = 0; + const struct queue_entry *entry; + + entry = queue_get_entries(uuid_queue); + + while (entry) { + bt_uuid_t *uuid = entry->data; + uint8_t uuid_len = bt_uuid_len(uuid); + + length += uuid_len; + + if (uuid_len == 2) + uuid16_included = true; + else if (uuid_len == 4) + uuid32_included = true; + else + uuid128_included = true; + + entry = entry->next; + } + + if (uuid16_included) + length += 2; + + if (uuid32_included) + length += 2; + + if (uuid128_included) + length += 2; + + return length; +} + +static uint8_t mfg_data_length(struct queue *manuf_data) +{ + uint8_t length = 0; + const struct queue_entry *entry; + + entry = queue_get_entries(manuf_data); + + while (entry) { + struct manufacturer_tagged_data *data = entry->data; + + length += 2 + sizeof(uint16_t) + data->len; + + entry = entry->next; + } + + return length; +} + +static uint8_t uuid_data_length(struct queue *tagged_data) +{ + uint8_t length = 0; + const struct queue_entry *entry; + + entry = queue_get_entries(tagged_data); + + while (entry) { + struct uuid_tagged_data *data = entry->data; + + length += 2 + bt_uuid_len(&data->uuid) + data->len; + + entry = entry->next; + } + + return length; +} + +static uint8_t calculate_length(struct bt_ad *ad) +{ + uint8_t length = 0; + + length += uuid_list_length(ad->service_uuids); + + length += uuid_list_length(ad->solicit_uuids); + + length += mfg_data_length(ad->manufacturer_data); + + length += uuid_data_length(ad->service_data); + + return length; +} + +static void serialize_uuids(struct queue *uuids, uint8_t uuid_type, + uint8_t ad_type, uint8_t *buf, + uint8_t *pos) +{ + const struct queue_entry *entry = queue_get_entries(uuids); + bool added = false; + uint8_t length_pos = 0; + + while (entry) { + bt_uuid_t *uuid = entry->data; + + if (uuid->type == uuid_type) { + if (!added) { + length_pos = (*pos)++; + buf[(*pos)++] = ad_type; + added = true; + } + + if (uuid_type != BT_UUID32) + bt_uuid_to_le(uuid, buf + *pos); + else + bt_put_le32(uuid->value.u32, buf + *pos); + + *pos += bt_uuid_len(uuid); + } + + entry = entry->next; + } + + if (added) + buf[length_pos] = *pos - length_pos - 1; +} + +static void serialize_service_uuids(struct queue *uuids, uint8_t *buf, + uint8_t *pos) +{ + serialize_uuids(uuids, BT_UUID16, LE_AD_TYPE_UUID16_ALL, buf, pos); + + serialize_uuids(uuids, BT_UUID32, LE_AD_TYPE_UUID32_ALL, buf, pos); + + serialize_uuids(uuids, BT_UUID128, LE_AD_TYPE_UUID128_ALL, buf, pos); +} + +static void serialize_solicit_uuids(struct queue *uuids, uint8_t *buf, + uint8_t *pos) +{ + serialize_uuids(uuids, BT_UUID16, LE_AD_TYPE_SOLICIT16, buf, pos); + + serialize_uuids(uuids, BT_UUID32, LE_AD_TYPE_SOLICIT32, buf, pos); + + serialize_uuids(uuids, BT_UUID128, LE_AD_TYPE_SOLICIT128, buf, pos); +} + +static void serialize_manuf_data(struct queue *manuf_data, uint8_t *buf, + uint8_t *pos) +{ + const struct queue_entry *entry = queue_get_entries(manuf_data); + + while (entry) { + struct manufacturer_tagged_data *data = entry->data; + + buf[(*pos)++] = data->len + 2 + 1; + + buf[(*pos)++] = LE_AD_TYPE_MANUF_DATA; + + bt_put_le16(data->manufacturer_id, buf + (*pos)); + + *pos += 2; + + memcpy(buf + *pos, data->data, data->len); + + *pos += data->len; + + entry = entry->next; + } +} + +static void serialize_service_data(struct queue *service_data, uint8_t *buf, + uint8_t *pos) +{ + const struct queue_entry *entry = queue_get_entries(service_data); + + while (entry) { + struct uuid_tagged_data *data = entry->data; + int uuid_len = bt_uuid_len(&data->uuid); + + buf[(*pos)++] = uuid_len + data->len + 1; + + switch (uuid_len) { + case 2: + buf[(*pos)++] = LE_AD_TYPE_SVC_DATA16; + break; + case 4: + buf[(*pos)++] = LE_AD_TYPE_SVC_DATA32; + break; + case 16: + buf[(*pos)++] = LE_AD_TYPE_SVC_DATA128; + break; + } + + if (uuid_len != 4) + bt_uuid_to_le(&data->uuid, buf + *pos); + else + bt_put_le32(data->uuid.value.u32, buf + *pos); + + *pos += uuid_len; + + memcpy(buf + *pos, data->data, data->len); + + *pos += data->len; + + entry = entry->next; + } +} + uint8_t *bt_ad_generate(struct bt_ad *ad, uint8_t *length) { - /* TODO: implement */ - return NULL; + uint8_t *adv_data; + uint8_t pos = 0; + + *length = calculate_length(ad); + + if (*length > MAX_ADV_DATA_LEN) + return NULL; + + adv_data = malloc0(*length); + + serialize_service_uuids(ad->service_uuids, adv_data, &pos); + + serialize_solicit_uuids(ad->solicit_uuids, adv_data, &pos); + + serialize_manuf_data(ad->manufacturer_data, adv_data, &pos); + + serialize_service_data(ad->service_data, adv_data, &pos); + + return adv_data; } static bool queue_add_uuid(struct queue *queue, const bt_uuid_t *uuid) @@ -153,7 +389,7 @@ static bool queue_add_uuid(struct queue *queue, const bt_uuid_t *uuid) if (!new_uuid) return false; - bt_uuid_to_uuid128(uuid, new_uuid); + *new_uuid = *uuid; queue_push_tail(queue, new_uuid); @@ -301,7 +537,7 @@ bool bt_ad_add_service_data(struct bt_ad *ad, const bt_uuid_t *uuid, void *data, if (!new_data) return false; - bt_uuid_to_uuid128(uuid, &new_data->uuid); + new_data->uuid = *uuid; new_data->data = malloc(len); if (!new_data) { -- 2.2.0.rc0.207.ga3a616c