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[107.146.107.67]) by smtp.gmail.com with ESMTPSA id k36-20020a81ac24000000b0060a17127a36sm353665ywh.37.2024.03.28.08.32.37 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Mar 2024 08:32:38 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v1] monitor/att: Add support for decoding GATT Long Reads Date: Thu, 28 Mar 2024 11:32:35 -0400 Message-ID: <20240328153237.1752328-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luiz Augusto von Dentz This adds support for decoding GATT Long Reads: < ACL Data TX: Handle 3585 flags 0x00 dlen 7 ATT: Read Request (0x0a) len 2 Handle: 0x0028 Type: Report Map (0x2a4b) > ACL Data RX: Handle 3585 flags 0x02 dlen 27 ATT: Read Response (0x0b) len 22 Value[22]: 05010902a10185020901a10095107501150025010509 Long Value[22]: 05010902a10185020901a10095107501150025010509 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 ATT: Read Blob Request (0x0c) len 4 Handle: 0x0028 Type: Report Map (0x2a4b) Offset: 0x0016 > ACL Data RX: Handle 3585 flags 0x02 dlen 27 ATT: Read Blob Response (0x0d) len 22 Value[22]: 19012910810205011601f826ff07750c950209300931 Long Value[44]: 05010902a10185020901a1009510750115002501050919 012910810205011601f826ff07750c950209300931 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 ATT: Read Blob Request (0x0c) len 4 Handle: 0x0028 Type: Report Map (0x2a4b) Offset: 0x002c > ACL Data RX: Handle 3585 flags 0x02 dlen 27 ATT: Read Blob Response (0x0d) len 22 Value[22]: 81061581257f75089501093881069501050c0a380281 Long Value[66]: 05010902a10185020901a1009510750115002501050919 012910810205011601f826ff07750c9502093009318106 1581257f75089501 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 ATT: Read Blob Request (0x0c) len 4 Handle: 0x0028 Type: Report Map (0x2a4b) Offset: 0x0042 > ACL Data RX: Handle 3585 flags 0x02 dlen 27 ATT: Read Blob Response (0x0d) len 22 Value[22]: 06c0c00643ff0a0202a101851175089513150026ff00 Long Value[88]: 05010902a10185020901a1009510750115002501050919 012910810205011601f826ff07750c9502093009318106 1581257f75089501093881069501050c0a38028106c0c0 0643ff0a0202a101851175089513150026ff00 < ACL Data TX: Handle 3585 flags 0x00 dlen 9 ATT: Read Blob Request (0x0c) len 4 Handle: 0x0028 Type: Report Map (0x2a4b) Offset: 0x0058 > ACL Data RX: Handle 3585 flags 0x02 dlen 14 ATT: Read Blob Response (0x0d) len 9 Value[9]: 0902810009029100c0 Handle: 0x0028 Type: Report Map (0x2a4b) Value[97]: 05010902a10185020901a1009510750115002501050919 012910810205011601f826ff07750c9502093009318106 1581257f75089501093881069501050c0a38028106c0c0 0643ff0a0202a101851175089513150026ff0009028100 09029100c0 --- monitor/att.c | 125 +++++++++++++++++++++++++++++++++++++++------- monitor/display.h | 2 +- 2 files changed, 108 insertions(+), 19 deletions(-) diff --git a/monitor/att.c b/monitor/att.c index 4628db44b139..3e5d7f12d182 100644 --- a/monitor/att.c +++ b/monitor/att.c @@ -46,10 +46,12 @@ #include "keys.h" struct att_read { + struct att_conn_data *conn; struct gatt_db_attribute *attr; bool in; uint16_t chan; void (*func)(const struct l2cap_frame *frame); + struct iovec *iov; }; struct att_conn_data { @@ -58,6 +60,7 @@ struct att_conn_data { struct gatt_db *rdb; struct timespec rdb_mtim; struct queue *reads; + uint16_t mtu; }; static void print_uuid(const char *label, const void *data, uint16_t size) @@ -210,6 +213,15 @@ done: print_field("Handle: 0x%4.4x", handle); } +static void att_read_free(struct att_read *read) +{ + if (!read) + return; + + util_iov_free(read->iov, 1); + free(read); +} + static void print_data_list(const char *label, uint8_t length, const struct l2cap_frame *frame) { @@ -231,7 +243,7 @@ static void print_data_list(const char *label, uint8_t length, print_hex_field("Value", frame->data, length - 2); - if (read) { + if (read && read->func) { struct l2cap_frame f; l2cap_frame_clone_size(&f, frame, length - 2); @@ -244,7 +256,7 @@ static void print_data_list(const char *label, uint8_t length, } packet_hexdump(frame->data, frame->size); - free(read); + att_read_free(read); } static void print_attribute_info(uint16_t type, const void *data, uint16_t len) @@ -370,7 +382,7 @@ static void att_error_response(const struct l2cap_frame *frame) */ if (pdu->request == 0x08 || pdu->request == 0x0a || pdu->request == 0x10) - free(att_get_read(frame)); + att_read_free(att_get_read(frame)); } static const struct bitfield_data chrc_prop_table[] = { @@ -4095,9 +4107,23 @@ static void att_exchange_mtu_req(const struct l2cap_frame *frame) static void att_exchange_mtu_rsp(const struct l2cap_frame *frame) { - const struct bt_l2cap_att_exchange_mtu_rsp *pdu = frame->data; + struct packet_conn_data *conn; + struct att_conn_data *data; + uint16_t mtu; - print_field("Server RX MTU: %d", le16_to_cpu(pdu->mtu)); + if (!l2cap_frame_get_le16((void *)frame, &mtu)) { + print_text(COLOR_ERROR, " invalid size"); + return; + } + + print_field("Server RX MTU: %d", mtu); + + conn = packet_get_conn_data(frame->handle); + data = att_get_conn_data(conn); + if (!data) + return; + + data->mtu = mtu; } static void att_find_info_req(const struct l2cap_frame *frame) @@ -4261,8 +4287,6 @@ static void queue_read(const struct l2cap_frame *frame, bt_uuid_t *uuid, } handler = attr ? get_handler(attr) : get_handler_uuid(uuid); - if (!handler || !handler->read) - return; conn = packet_get_conn_data(frame->handle); data = att_get_conn_data(conn); @@ -4273,10 +4297,11 @@ static void queue_read(const struct l2cap_frame *frame, bt_uuid_t *uuid, data->reads = queue_new(); read = new0(struct att_read, 1); + read->conn = data; read->attr = attr; read->in = frame->in; read->chan = frame->chan; - read->func = handler->read; + read->func = handler ? handler->read : NULL; queue_push_tail(data->reads, read); } @@ -4334,31 +4359,95 @@ static void att_read_req(const struct l2cap_frame *frame) queue_read(frame, NULL, handle); } +static void att_read_append(struct att_read *read, + const struct l2cap_frame *frame) +{ + if (!read->iov) + read->iov = new0(struct iovec, 1); + util_iov_append(read->iov, frame->data, frame->size); +} + +static void att_read_func(struct att_read *read, + const struct l2cap_frame *frame) +{ + att_read_append(read, frame); + + print_attribute(read->attr); + print_hex_field("Value", read->iov->iov_base, read->iov->iov_len); + + if (read->func) { + struct l2cap_frame f = *frame; + + f.data = read->iov->iov_base; + f.size = read->iov->iov_len; + + read->func(&f); + } + + att_read_free(read); +} + static void att_read_rsp(const struct l2cap_frame *frame) { struct att_read *read; + print_hex_field("Value", frame->data, frame->size); + read = att_get_read(frame); if (!read) return; - print_attribute(read->attr); - print_hex_field("Value", frame->data, frame->size); + /* Check if the data size is equal to the MTU then read long procedure + * maybe used. + */ + if (frame->size == read->conn->mtu - 1) { + att_read_append(read, frame); + print_hex_field("Long Value", read->iov->iov_base, + read->iov->iov_len); + queue_push_head(read->conn->reads, read); + return; + } - read->func(frame); - - free(read); + att_read_func(read, frame); } static void att_read_blob_req(const struct l2cap_frame *frame) { - print_handle(frame, get_le16(frame->data), false); - print_field("Offset: 0x%4.4x", get_le16(frame->data + 2)); + uint16_t handle, offset; + struct att_read *read; + + if (!l2cap_frame_get_le16((void *)frame, &handle)) { + print_text(COLOR_ERROR, "invalid size"); + return; + } + + if (!l2cap_frame_get_le16((void *)frame, &offset)) { + print_text(COLOR_ERROR, "invalid size"); + return; + } + + print_handle(frame, handle, false); + print_field("Offset: 0x%4.4x", offset); + + read = att_get_read(frame); + if (!read) + return; + + /* Check if attribute handle and offset match so the read object shall + * be keeped. + */ + if (gatt_db_attribute_get_handle(read->attr) == handle && + offset == read->iov->iov_len) { + queue_push_head(read->conn->reads, read); + return; + } + + att_read_func(read, frame); } static void att_read_blob_rsp(const struct l2cap_frame *frame) { - packet_hexdump(frame->data, frame->size); + att_read_rsp(frame); } static void att_read_multiple_req(const struct l2cap_frame *frame) @@ -4403,7 +4492,7 @@ static void print_group_list(const char *label, uint8_t length, print_handle_range("Handle range", frame->data); print_uuid("UUID", frame->data + 4, length - 4); - if (read) { + if (read && read->func) { struct l2cap_frame f; l2cap_frame_clone_size(&f, frame, length); @@ -4416,7 +4505,7 @@ static void print_group_list(const char *label, uint8_t length, } packet_hexdump(frame->data, frame->size); - free(read); + att_read_free(read); } static void att_read_group_type_rsp(const struct l2cap_frame *frame) diff --git a/monitor/display.h b/monitor/display.h index 5a82f8e6fd93..ee076448cc31 100644 --- a/monitor/display.h +++ b/monitor/display.h @@ -87,7 +87,7 @@ static inline void print_hex_field(const char *label, const uint8_t *data, for (i = 0; i < len; i++) sprintf(str + (i * 2), "%2.2x", data[i]); - print_field("%s: %s", label, str); + print_field("%s[%u]: %s", label, len, str); } void set_default_pager_num_columns(int num_columns); -- 2.44.0