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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-05-05 03:06:28 +0300
committerMarcel Holtmann <marcel@holtmann.org>2022-05-19 21:11:26 +0300
commit8f9ae5b3ae80f168a6224529e3787f4fb27f299a (patch)
tree26f3b9991b5bcb71dfcc38b893fd7b7e8b4c415e /net
parent3b42055388c30f2761a2d9cd9af2c99611dfe457 (diff)
downloadlinux-8f9ae5b3ae80f168a6224529e3787f4fb27f299a.tar.xz
Bluetooth: eir: Add helpers for managing service data
This adds helpers for accessing and appending service data (0x16) ad type. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/eir.c31
-rw-r--r--net/bluetooth/eir.h4
2 files changed, 35 insertions, 0 deletions
diff --git a/net/bluetooth/eir.c b/net/bluetooth/eir.c
index 7e930f77ecab..7d77fb00c2bf 100644
--- a/net/bluetooth/eir.c
+++ b/net/bluetooth/eir.c
@@ -55,6 +55,19 @@ u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
return eir_append_le16(ptr, ad_len, EIR_APPEARANCE, hdev->appearance);
}
+u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data,
+ u8 data_len)
+{
+ eir[eir_len++] = sizeof(u8) + sizeof(uuid) + data_len;
+ eir[eir_len++] = EIR_SERVICE_DATA;
+ put_unaligned_le16(uuid, &eir[eir_len]);
+ eir_len += sizeof(uuid);
+ memcpy(&eir[eir_len], data, data_len);
+ eir_len += data_len;
+
+ return eir_len;
+}
+
static u8 *create_uuid16_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
u8 *ptr = data, *uuids_start = NULL;
@@ -333,3 +346,21 @@ u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr)
return scan_rsp_len;
}
+
+void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len)
+{
+ while ((eir = eir_get_data(eir, eir_len, EIR_SERVICE_DATA, len))) {
+ u16 value = get_unaligned_le16(eir);
+
+ if (uuid == value) {
+ if (len)
+ *len -= 2;
+ return &eir[2];
+ }
+
+ eir += *len;
+ eir_len -= *len;
+ }
+
+ return NULL;
+}
diff --git a/net/bluetooth/eir.h b/net/bluetooth/eir.h
index 43f1945bffc5..62f2374078f2 100644
--- a/net/bluetooth/eir.h
+++ b/net/bluetooth/eir.h
@@ -14,6 +14,8 @@ u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len);
u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len);
+u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data,
+ u8 data_len);
static inline u16 eir_precalc_len(u8 data_len)
{
@@ -92,3 +94,5 @@ static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type,
return NULL;
}
+
+void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len);