143625864Smatthias.ringwald /* 2a0c35809S[email protected] * Copyright (C) 2014 BlueKitchen GmbH 31713bceaSmatthias.ringwald * 41713bceaSmatthias.ringwald * Redistribution and use in source and binary forms, with or without 51713bceaSmatthias.ringwald * modification, are permitted provided that the following conditions 61713bceaSmatthias.ringwald * are met: 71713bceaSmatthias.ringwald * 81713bceaSmatthias.ringwald * 1. Redistributions of source code must retain the above copyright 91713bceaSmatthias.ringwald * notice, this list of conditions and the following disclaimer. 101713bceaSmatthias.ringwald * 2. Redistributions in binary form must reproduce the above copyright 111713bceaSmatthias.ringwald * notice, this list of conditions and the following disclaimer in the 121713bceaSmatthias.ringwald * documentation and/or other materials provided with the distribution. 131713bceaSmatthias.ringwald * 3. Neither the name of the copyright holders nor the names of 141713bceaSmatthias.ringwald * contributors may be used to endorse or promote products derived 151713bceaSmatthias.ringwald * from this software without specific prior written permission. 166b64433eSmatthias.ringwald * 4. Any redistribution, use, or modification is done solely for 176b64433eSmatthias.ringwald * personal benefit and not for any commercial purpose or for 186b64433eSmatthias.ringwald * monetary gain. 191713bceaSmatthias.ringwald * 20a0c35809S[email protected] * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 211713bceaSmatthias.ringwald * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 221713bceaSmatthias.ringwald * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 231713bceaSmatthias.ringwald * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 241713bceaSmatthias.ringwald * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 251713bceaSmatthias.ringwald * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 261713bceaSmatthias.ringwald * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 271713bceaSmatthias.ringwald * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 281713bceaSmatthias.ringwald * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 291713bceaSmatthias.ringwald * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 301713bceaSmatthias.ringwald * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311713bceaSmatthias.ringwald * SUCH DAMAGE. 321713bceaSmatthias.ringwald * 33a0c35809S[email protected] * Please inquire about commercial licensing options at 34a0c35809S[email protected] * [email protected] 356b64433eSmatthias.ringwald * 361713bceaSmatthias.ringwald */ 371713bceaSmatthias.ringwald 381713bceaSmatthias.ringwald /* 3943625864Smatthias.ringwald * l2cap.c 4043625864Smatthias.ringwald * 4143625864Smatthias.ringwald * Logical Link Control and Adaption Protocl (L2CAP) 4243625864Smatthias.ringwald * 4343625864Smatthias.ringwald * Created by Matthias Ringwald on 5/16/09. 4443625864Smatthias.ringwald */ 4543625864Smatthias.ringwald 4643625864Smatthias.ringwald #include "l2cap.h" 47645658c9Smatthias.ringwald #include "hci.h" 482b3c6c9bSmatthias.ringwald #include "hci_dump.h" 4916ece135SMatthias Ringwald #include "btstack_debug.h" 500e2df43fSMatthias Ringwald #include "btstack_event.h" 51d3a9df87Smatthias.ringwald #include "btstack_memory.h" 5243625864Smatthias.ringwald 53cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 5483fd9c76SMatthias Ringwald #include "ble/sm.h" 5583fd9c76SMatthias Ringwald #endif 5683fd9c76SMatthias Ringwald 5743625864Smatthias.ringwald #include <stdarg.h> 5843625864Smatthias.ringwald #include <string.h> 5943625864Smatthias.ringwald 6043625864Smatthias.ringwald #include <stdio.h> 6143625864Smatthias.ringwald 624c744e21Smatthias.ringwald // nr of buffered acl packets in outgoing queue to get max performance 634c744e21Smatthias.ringwald #define NR_BUFFERED_ACL_PACKETS 3 644c744e21Smatthias.ringwald 6539bda6d5Smatthias.ringwald // used to cache l2cap rejects, echo, and informational requests 66e16a9cacSmatthias.ringwald #define NR_PENDING_SIGNALING_RESPONSES 3 6739bda6d5Smatthias.ringwald 6885aeef60SMatthias Ringwald // nr of credits provided to remote if credits fall below watermark 6985aeef60SMatthias Ringwald #define L2CAP_LE_DATA_CHANNELS_AUTOMATIC_CREDITS_WATERMARK 5 7085aeef60SMatthias Ringwald #define L2CAP_LE_DATA_CHANNELS_AUTOMATIC_CREDITS_INCREMENT 5 7185aeef60SMatthias Ringwald 7200d93d79Smatthias.ringwald // offsets for L2CAP SIGNALING COMMANDS 7300d93d79Smatthias.ringwald #define L2CAP_SIGNALING_COMMAND_CODE_OFFSET 0 7400d93d79Smatthias.ringwald #define L2CAP_SIGNALING_COMMAND_SIGID_OFFSET 1 7500d93d79Smatthias.ringwald #define L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET 2 7600d93d79Smatthias.ringwald #define L2CAP_SIGNALING_COMMAND_DATA_OFFSET 4 7700d93d79Smatthias.ringwald 785628cf69SMatthias Ringwald // internal table 795628cf69SMatthias Ringwald #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL 0 805628cf69SMatthias Ringwald #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL 1 815628cf69SMatthias Ringwald #define L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL 2 825628cf69SMatthias Ringwald #define L2CAP_FIXED_CHANNEL_TABLE_SIZE (L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL+1) 835628cf69SMatthias Ringwald 8433c40538SMatthias Ringwald // prototypes 8533c40538SMatthias Ringwald static void l2cap_finialize_channel_close(l2cap_channel_t *channel); 8633c40538SMatthias Ringwald static inline l2cap_service_t * l2cap_get_service(uint16_t psm); 8733c40538SMatthias Ringwald static void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status); 8834e7e577SMatthias Ringwald static void l2cap_emit_can_send_now(btstack_packet_handler_t packet_handler, uint16_t channel); 8933c40538SMatthias Ringwald static void l2cap_emit_channel_closed(l2cap_channel_t *channel); 9044276248SMatthias Ringwald static void l2cap_emit_incoming_connection(l2cap_channel_t *channel); 9133c40538SMatthias Ringwald static int l2cap_channel_ready_for_open(l2cap_channel_t *channel); 9233c40538SMatthias Ringwald static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 933d50b4baSMatthias Ringwald static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ); 9430725612SMatthias Ringwald static void l2cap_notify_channel_can_send(void); 9557be49d6SMatthias Ringwald 96cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 9757be49d6SMatthias Ringwald static void l2cap_emit_le_channel_opened(l2cap_channel_t *channel, uint8_t status); 9857be49d6SMatthias Ringwald static void l2cap_emit_le_incoming_connection(l2cap_channel_t *channel); 9957be49d6SMatthias Ringwald static l2cap_channel_t * l2cap_le_get_channel_for_local_cid(uint16_t local_cid); 10044276248SMatthias Ringwald static void l2cap_le_notify_channel_can_send(l2cap_channel_t *channel); 101828a7f7aSMatthias Ringwald static void l2cap_le_finialize_channel_close(l2cap_channel_t *channel); 102e7d0c9aaSMatthias Ringwald static inline l2cap_service_t * l2cap_le_get_service(uint16_t psm); 103e7d0c9aaSMatthias Ringwald #endif 10433c40538SMatthias Ringwald 1055628cf69SMatthias Ringwald typedef struct l2cap_fixed_channel { 1065628cf69SMatthias Ringwald btstack_packet_handler_t callback; 1072125de09SMatthias Ringwald uint8_t waiting_for_can_send_now; 1085628cf69SMatthias Ringwald } l2cap_fixed_channel_t; 1095628cf69SMatthias Ringwald 1105628cf69SMatthias Ringwald static btstack_linked_list_t l2cap_channels; 1115628cf69SMatthias Ringwald static btstack_linked_list_t l2cap_services; 11257be49d6SMatthias Ringwald 11357be49d6SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 1145628cf69SMatthias Ringwald static btstack_linked_list_t l2cap_le_channels; 1155628cf69SMatthias Ringwald static btstack_linked_list_t l2cap_le_services; 11657be49d6SMatthias Ringwald #endif 11739bda6d5Smatthias.ringwald 11839bda6d5Smatthias.ringwald // used to cache l2cap rejects, echo, and informational requests 1192b83fb7dSmatthias.ringwald static l2cap_signaling_response_t signaling_responses[NR_PENDING_SIGNALING_RESPONSES]; 1202b83fb7dSmatthias.ringwald static int signaling_responses_pending; 1212b83fb7dSmatthias.ringwald 12233c40538SMatthias Ringwald static uint8_t require_security_level2_for_outgoing_sdp; 12333c40538SMatthias Ringwald 124fb37a842SMatthias Ringwald static btstack_packet_callback_registration_t hci_event_callback_registration; 125fb37a842SMatthias Ringwald 12633c40538SMatthias Ringwald static btstack_packet_handler_t l2cap_event_packet_handler; 1275628cf69SMatthias Ringwald static l2cap_fixed_channel_t fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_SIZE]; 12839bda6d5Smatthias.ringwald 12934e7e577SMatthias Ringwald static uint16_t l2cap_fixed_channel_table_channel_id_for_index(int index){ 13034e7e577SMatthias Ringwald switch (index){ 13134e7e577SMatthias Ringwald case L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL: 13234e7e577SMatthias Ringwald return L2CAP_CID_ATTRIBUTE_PROTOCOL; 13334e7e577SMatthias Ringwald case L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL: 13434e7e577SMatthias Ringwald return L2CAP_CID_SECURITY_MANAGER_PROTOCOL; 13534e7e577SMatthias Ringwald case L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL: 13634e7e577SMatthias Ringwald return L2CAP_CID_CONNECTIONLESS_CHANNEL; 13734e7e577SMatthias Ringwald default: 13834e7e577SMatthias Ringwald return 0; 13934e7e577SMatthias Ringwald } 14034e7e577SMatthias Ringwald } 1415628cf69SMatthias Ringwald static int l2cap_fixed_channel_table_index_for_channel_id(uint16_t channel_id){ 1425628cf69SMatthias Ringwald switch (channel_id){ 1435628cf69SMatthias Ringwald case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1445628cf69SMatthias Ringwald return L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL; 1455628cf69SMatthias Ringwald case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1465628cf69SMatthias Ringwald return L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL; 1475628cf69SMatthias Ringwald case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1485628cf69SMatthias Ringwald return L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL; 1495628cf69SMatthias Ringwald default: 1505628cf69SMatthias Ringwald return -1; 1515628cf69SMatthias Ringwald } 1525628cf69SMatthias Ringwald } 15339bda6d5Smatthias.ringwald 15434e7e577SMatthias Ringwald static int l2cap_fixed_channel_table_index_is_le(int index){ 15534e7e577SMatthias Ringwald if (index == L2CAP_CID_CONNECTIONLESS_CHANNEL) return 0; 15634e7e577SMatthias Ringwald return 1; 15734e7e577SMatthias Ringwald } 15834e7e577SMatthias Ringwald 15971de195eSMatthias Ringwald void l2cap_init(void){ 1602b83fb7dSmatthias.ringwald signaling_responses_pending = 0; 161808a48abSmatthias.ringwald 162f5454fc6Smatthias.ringwald l2cap_channels = NULL; 163f5454fc6Smatthias.ringwald l2cap_services = NULL; 1647192e786SMatthias Ringwald l2cap_le_services = NULL; 1657192e786SMatthias Ringwald l2cap_le_channels = NULL; 166f5454fc6Smatthias.ringwald 16733c40538SMatthias Ringwald l2cap_event_packet_handler = NULL; 1685628cf69SMatthias Ringwald memset(fixed_channels, 0, sizeof(fixed_channels)); 169f5454fc6Smatthias.ringwald 170ac301f95S[email protected] require_security_level2_for_outgoing_sdp = 0; 171ac301f95S[email protected] 172fcadd0caSmatthias.ringwald // 1732718e2e7Smatthias.ringwald // register callback with HCI 174fcadd0caSmatthias.ringwald // 175d9a7306aSMatthias Ringwald hci_event_callback_registration.callback = &l2cap_hci_event_handler; 176fb37a842SMatthias Ringwald hci_add_event_handler(&hci_event_callback_registration); 177fb37a842SMatthias Ringwald 178d9a7306aSMatthias Ringwald hci_register_acl_packet_handler(&l2cap_acl_handler); 179fb37a842SMatthias Ringwald 18015a95bd5SMatthias Ringwald gap_connectable_control(0); // no services yet 181fcadd0caSmatthias.ringwald } 182fcadd0caSmatthias.ringwald 183ffbf8201SMatthias Ringwald void l2cap_register_packet_handler(void (*handler)(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)){ 18433c40538SMatthias Ringwald l2cap_event_packet_handler = handler; 1851e6aba47Smatthias.ringwald } 1861e6aba47Smatthias.ringwald 18717a9b554SMatthias Ringwald static void l2cap_dispatch_to_channel(l2cap_channel_t *channel, uint8_t type, uint8_t * data, uint16_t size){ 18858de5610Smatthias.ringwald (* (channel->packet_handler))(type, channel->local_cid, data, size); 18958de5610Smatthias.ringwald } 19058de5610Smatthias.ringwald 19144276248SMatthias Ringwald static void l2cap_emit_simple_event_with_cid(l2cap_channel_t * channel, uint8_t event_code){ 19244276248SMatthias Ringwald uint8_t event[4]; 19344276248SMatthias Ringwald event[0] = event_code; 19444276248SMatthias Ringwald event[1] = sizeof(event) - 2; 19544276248SMatthias Ringwald little_endian_store_16(event, 2, channel->local_cid); 19644276248SMatthias Ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 19744276248SMatthias Ringwald l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 19844276248SMatthias Ringwald } 19944276248SMatthias Ringwald 20058de5610Smatthias.ringwald void l2cap_emit_channel_opened(l2cap_channel_t *channel, uint8_t status) { 201c9dc710bS[email protected] log_info("L2CAP_EVENT_CHANNEL_OPENED status 0x%x addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x local_mtu %u, remote_mtu %u, flush_timeout %u", 202fc64f94aSMatthias Ringwald status, bd_addr_to_str(channel->address), channel->con_handle, channel->psm, 203c9dc710bS[email protected] channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu, channel->flush_timeout); 204c9dc710bS[email protected] uint8_t event[23]; 20558de5610Smatthias.ringwald event[0] = L2CAP_EVENT_CHANNEL_OPENED; 20658de5610Smatthias.ringwald event[1] = sizeof(event) - 2; 20758de5610Smatthias.ringwald event[2] = status; 208724d70a2SMatthias Ringwald reverse_bd_addr(channel->address, &event[3]); 209fc64f94aSMatthias Ringwald little_endian_store_16(event, 9, channel->con_handle); 210f8fbdce0SMatthias Ringwald little_endian_store_16(event, 11, channel->psm); 211f8fbdce0SMatthias Ringwald little_endian_store_16(event, 13, channel->local_cid); 212f8fbdce0SMatthias Ringwald little_endian_store_16(event, 15, channel->remote_cid); 213f8fbdce0SMatthias Ringwald little_endian_store_16(event, 17, channel->local_mtu); 214f8fbdce0SMatthias Ringwald little_endian_store_16(event, 19, channel->remote_mtu); 215f8fbdce0SMatthias Ringwald little_endian_store_16(event, 21, channel->flush_timeout); 21658de5610Smatthias.ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 21717a9b554SMatthias Ringwald l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 21858de5610Smatthias.ringwald } 21958de5610Smatthias.ringwald 22044276248SMatthias Ringwald static void l2cap_emit_channel_closed(l2cap_channel_t *channel) { 221e0abb8e7S[email protected] log_info("L2CAP_EVENT_CHANNEL_CLOSED local_cid 0x%x", channel->local_cid); 22244276248SMatthias Ringwald l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_CHANNEL_CLOSED); 22358de5610Smatthias.ringwald } 22458de5610Smatthias.ringwald 22544276248SMatthias Ringwald 22644276248SMatthias Ringwald static void l2cap_emit_can_send_now(btstack_packet_handler_t packet_handler, uint16_t channel) { 22744276248SMatthias Ringwald log_info("L2CAP_EVENT_CHANNEL_CAN_SEND_NOW local_cid 0x%x", channel); 22844276248SMatthias Ringwald uint8_t event[4]; 22944276248SMatthias Ringwald event[0] = L2CAP_EVENT_CAN_SEND_NOW; 23044276248SMatthias Ringwald event[1] = sizeof(event) - 2; 23144276248SMatthias Ringwald little_endian_store_16(event, 2, channel); 23244276248SMatthias Ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 23344276248SMatthias Ringwald packet_handler(HCI_EVENT_PACKET, channel, event, sizeof(event)); 23444276248SMatthias Ringwald } 23544276248SMatthias Ringwald 23644276248SMatthias Ringwald static void l2cap_emit_incoming_connection(l2cap_channel_t *channel) { 237e0abb8e7S[email protected] log_info("L2CAP_EVENT_INCOMING_CONNECTION addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x", 238fc64f94aSMatthias Ringwald bd_addr_to_str(channel->address), channel->con_handle, channel->psm, channel->local_cid, channel->remote_cid); 23958de5610Smatthias.ringwald uint8_t event[16]; 24058de5610Smatthias.ringwald event[0] = L2CAP_EVENT_INCOMING_CONNECTION; 24158de5610Smatthias.ringwald event[1] = sizeof(event) - 2; 242724d70a2SMatthias Ringwald reverse_bd_addr(channel->address, &event[2]); 243fc64f94aSMatthias Ringwald little_endian_store_16(event, 8, channel->con_handle); 244f8fbdce0SMatthias Ringwald little_endian_store_16(event, 10, channel->psm); 245f8fbdce0SMatthias Ringwald little_endian_store_16(event, 12, channel->local_cid); 246f8fbdce0SMatthias Ringwald little_endian_store_16(event, 14, channel->remote_cid); 24758de5610Smatthias.ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 24817a9b554SMatthias Ringwald l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 2490af41d30Smatthias.ringwald } 250808a48abSmatthias.ringwald 251fc64f94aSMatthias Ringwald static void l2cap_emit_connection_parameter_update_response(hci_con_handle_t con_handle, uint16_t result){ 252ccf076adS[email protected] uint8_t event[6]; 253ccf076adS[email protected] event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE; 254ccf076adS[email protected] event[1] = 4; 255fc64f94aSMatthias Ringwald little_endian_store_16(event, 2, con_handle); 256f8fbdce0SMatthias Ringwald little_endian_store_16(event, 4, result); 257ccf076adS[email protected] hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 25833c40538SMatthias Ringwald if (!l2cap_event_packet_handler) return; 25933c40538SMatthias Ringwald (*l2cap_event_packet_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 260ccf076adS[email protected] } 261ccf076adS[email protected] 2627f02f414SMatthias Ringwald static l2cap_channel_t * l2cap_get_channel_for_local_cid(uint16_t local_cid){ 263665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 264665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 265665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 266665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 267b35f641cSmatthias.ringwald if ( channel->local_cid == local_cid) { 268f62db1e3Smatthias.ringwald return channel; 269f62db1e3Smatthias.ringwald } 270f62db1e3Smatthias.ringwald } 271f62db1e3Smatthias.ringwald return NULL; 272f62db1e3Smatthias.ringwald } 273f62db1e3Smatthias.ringwald 2740b9d7e78SMatthias Ringwald /// 2750b9d7e78SMatthias Ringwald 27630725612SMatthias Ringwald void l2cap_request_can_send_now_event(uint16_t local_cid){ 27730725612SMatthias Ringwald l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 27830725612SMatthias Ringwald if (!channel) return; 27930725612SMatthias Ringwald channel->waiting_for_can_send_now = 1; 28030725612SMatthias Ringwald l2cap_notify_channel_can_send(); 28130725612SMatthias Ringwald } 28230725612SMatthias Ringwald 2830b9d7e78SMatthias Ringwald void l2cap_request_can_send_fix_channel_now_event(hci_con_handle_t con_handle, uint16_t channel_id){ 2840b9d7e78SMatthias Ringwald int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 2850b9d7e78SMatthias Ringwald if (index < 0) return; 2860b9d7e78SMatthias Ringwald fixed_channels[index].waiting_for_can_send_now = 1; 2870b9d7e78SMatthias Ringwald l2cap_notify_channel_can_send(); 2880b9d7e78SMatthias Ringwald } 2890b9d7e78SMatthias Ringwald 2900b9d7e78SMatthias Ringwald /// 2910b9d7e78SMatthias Ringwald 2926b1fde37Smatthias.ringwald int l2cap_can_send_packet_now(uint16_t local_cid){ 2936b1fde37Smatthias.ringwald l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 2946b1fde37Smatthias.ringwald if (!channel) return 0; 2950b9d7e78SMatthias Ringwald return hci_can_send_acl_packet_now(channel->con_handle); 2967856fb31S[email protected] } 2977856fb31S[email protected] 29883e7cdd9SMatthias Ringwald int l2cap_can_send_prepared_packet_now(uint16_t local_cid){ 29983e7cdd9SMatthias Ringwald l2cap_channel_t *channel = l2cap_get_channel_for_local_cid(local_cid); 30083e7cdd9SMatthias Ringwald if (!channel) return 0; 3010b9d7e78SMatthias Ringwald return hci_can_send_prepared_acl_packet_now(channel->con_handle); 30283e7cdd9SMatthias Ringwald } 30383e7cdd9SMatthias Ringwald 304fc64f94aSMatthias Ringwald int l2cap_can_send_fixed_channel_packet_now(hci_con_handle_t con_handle, uint16_t channel_id){ 3050b9d7e78SMatthias Ringwald return hci_can_send_acl_packet_now(con_handle); 3062125de09SMatthias Ringwald } 3070b9d7e78SMatthias Ringwald 3080b9d7e78SMatthias Ringwald /// 3093cab4fcaS[email protected] 31096cbd662Smatthias.ringwald uint16_t l2cap_get_remote_mtu_for_local_cid(uint16_t local_cid){ 31196cbd662Smatthias.ringwald l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 31296cbd662Smatthias.ringwald if (channel) { 31396cbd662Smatthias.ringwald return channel->remote_mtu; 31496cbd662Smatthias.ringwald } 31596cbd662Smatthias.ringwald return 0; 31696cbd662Smatthias.ringwald } 31796cbd662Smatthias.ringwald 318ec820d77SMatthias Ringwald static l2cap_channel_t * l2cap_channel_for_rtx_timer(btstack_timer_source_t * ts){ 319665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 320665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 321665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 322665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 3235932bd7cS[email protected] if ( &channel->rtx == ts) { 3245932bd7cS[email protected] return channel; 3255932bd7cS[email protected] } 3265932bd7cS[email protected] } 3275932bd7cS[email protected] return NULL; 3285932bd7cS[email protected] } 3295932bd7cS[email protected] 330ec820d77SMatthias Ringwald static void l2cap_rtx_timeout(btstack_timer_source_t * ts){ 3315932bd7cS[email protected] l2cap_channel_t * channel = l2cap_channel_for_rtx_timer(ts); 33295d2c8f4SMatthias Ringwald if (!channel) return; 3335932bd7cS[email protected] 3345932bd7cS[email protected] log_info("l2cap_rtx_timeout for local cid 0x%02x", channel->local_cid); 3355932bd7cS[email protected] 3365932bd7cS[email protected] // "When terminating the channel, it is not necessary to send a L2CAP_DisconnectReq 3375932bd7cS[email protected] // and enter WAIT_DISCONNECT state. Channels can be transitioned directly to the CLOSED state." 3385932bd7cS[email protected] // notify client 3395932bd7cS[email protected] l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_RTX_TIMEOUT); 3405932bd7cS[email protected] 3415932bd7cS[email protected] // discard channel 3429dcb2fb2S[email protected] // no need to stop timer here, it is removed from list during timer callback 343665d90f2SMatthias Ringwald btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 3445932bd7cS[email protected] btstack_memory_l2cap_channel_free(channel); 3455932bd7cS[email protected] } 3465932bd7cS[email protected] 3475932bd7cS[email protected] static void l2cap_stop_rtx(l2cap_channel_t * channel){ 3485932bd7cS[email protected] log_info("l2cap_stop_rtx for local cid 0x%02x", channel->local_cid); 349528a4a3bSMatthias Ringwald btstack_run_loop_remove_timer(&channel->rtx); 3505932bd7cS[email protected] } 3515932bd7cS[email protected] 3525932bd7cS[email protected] static void l2cap_start_rtx(l2cap_channel_t * channel){ 3535932bd7cS[email protected] l2cap_stop_rtx(channel); 354cb0ff06bS[email protected] log_info("l2cap_start_rtx for local cid 0x%02x", channel->local_cid); 355528a4a3bSMatthias Ringwald btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 356528a4a3bSMatthias Ringwald btstack_run_loop_set_timer(&channel->rtx, L2CAP_RTX_TIMEOUT_MS); 357528a4a3bSMatthias Ringwald btstack_run_loop_add_timer(&channel->rtx); 3585932bd7cS[email protected] } 3595932bd7cS[email protected] 3605932bd7cS[email protected] static void l2cap_start_ertx(l2cap_channel_t * channel){ 3615932bd7cS[email protected] log_info("l2cap_start_ertx for local cid 0x%02x", channel->local_cid); 3625932bd7cS[email protected] l2cap_stop_rtx(channel); 363528a4a3bSMatthias Ringwald btstack_run_loop_set_timer_handler(&channel->rtx, l2cap_rtx_timeout); 364528a4a3bSMatthias Ringwald btstack_run_loop_set_timer(&channel->rtx, L2CAP_ERTX_TIMEOUT_MS); 365528a4a3bSMatthias Ringwald btstack_run_loop_add_timer(&channel->rtx); 3665932bd7cS[email protected] } 3675932bd7cS[email protected] 36871de195eSMatthias Ringwald void l2cap_require_security_level_2_for_outgoing_sdp(void){ 369ac301f95S[email protected] require_security_level2_for_outgoing_sdp = 1; 370ac301f95S[email protected] } 371ac301f95S[email protected] 372df3354fcS[email protected] static int l2cap_security_level_0_allowed_for_PSM(uint16_t psm){ 373ac301f95S[email protected] return (psm == PSM_SDP) && (!require_security_level2_for_outgoing_sdp); 374df3354fcS[email protected] } 3755932bd7cS[email protected] 3767f02f414SMatthias Ringwald static int l2cap_send_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 377b1d43497Smatthias.ringwald 378a35252c8S[email protected] if (!hci_can_send_acl_packet_now(handle)){ 3799da54300S[email protected] log_info("l2cap_send_signaling_packet, cannot send"); 380b1d43497Smatthias.ringwald return BTSTACK_ACL_BUFFERS_FULL; 381b1d43497Smatthias.ringwald } 382b1d43497Smatthias.ringwald 3839da54300S[email protected] // log_info("l2cap_send_signaling_packet type %u", cmd); 3842a373862S[email protected] hci_reserve_packet_buffer(); 385facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 38658de5610Smatthias.ringwald va_list argptr; 38758de5610Smatthias.ringwald va_start(argptr, identifier); 38870efece1S[email protected] uint16_t len = l2cap_create_signaling_classic(acl_buffer, handle, cmd, identifier, argptr); 38958de5610Smatthias.ringwald va_end(argptr); 3909da54300S[email protected] // log_info("l2cap_send_signaling_packet con %u!", handle); 391826f7347S[email protected] return hci_send_acl_packet_buffer(len); 39258de5610Smatthias.ringwald } 39358de5610Smatthias.ringwald 394a9a4c409SMatthias Ringwald #ifdef ENABLE_BLE 3957f02f414SMatthias Ringwald static int l2cap_send_le_signaling_packet(hci_con_handle_t handle, L2CAP_SIGNALING_COMMANDS cmd, uint8_t identifier, ...){ 39670efece1S[email protected] 397a35252c8S[email protected] if (!hci_can_send_acl_packet_now(handle)){ 3989da54300S[email protected] log_info("l2cap_send_signaling_packet, cannot send"); 39970efece1S[email protected] return BTSTACK_ACL_BUFFERS_FULL; 40070efece1S[email protected] } 40170efece1S[email protected] 4029da54300S[email protected] // log_info("l2cap_send_signaling_packet type %u", cmd); 4032a373862S[email protected] hci_reserve_packet_buffer(); 404facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 40570efece1S[email protected] va_list argptr; 40670efece1S[email protected] va_start(argptr, identifier); 40770efece1S[email protected] uint16_t len = l2cap_create_signaling_le(acl_buffer, handle, cmd, identifier, argptr); 40870efece1S[email protected] va_end(argptr); 4099da54300S[email protected] // log_info("l2cap_send_signaling_packet con %u!", handle); 410826f7347S[email protected] return hci_send_acl_packet_buffer(len); 41170efece1S[email protected] } 41270efece1S[email protected] #endif 41370efece1S[email protected] 414b1d43497Smatthias.ringwald uint8_t *l2cap_get_outgoing_buffer(void){ 415facf93fdS[email protected] return hci_get_outgoing_packet_buffer() + COMPLETE_L2CAP_HEADER; // 8 bytes 416b1d43497Smatthias.ringwald } 4176218e6f1Smatthias.ringwald 4186b4af23dS[email protected] int l2cap_reserve_packet_buffer(void){ 4196b4af23dS[email protected] return hci_reserve_packet_buffer(); 4206b4af23dS[email protected] } 4216b4af23dS[email protected] 42268a0fcf7S[email protected] void l2cap_release_packet_buffer(void){ 42368a0fcf7S[email protected] hci_release_packet_buffer(); 42468a0fcf7S[email protected] } 42568a0fcf7S[email protected] 4267f107edaSMatthias Ringwald static void l2cap_setup_header(uint8_t * acl_buffer, hci_con_handle_t con_handle, uint16_t remote_cid, uint16_t len){ 4277f107edaSMatthias Ringwald 4287f107edaSMatthias Ringwald int pb = hci_non_flushable_packet_boundary_flag_supported() ? 0x00 : 0x02; 4297f107edaSMatthias Ringwald 4307f107edaSMatthias Ringwald // 0 - Connection handle : PB=pb : BC=00 4317f107edaSMatthias Ringwald little_endian_store_16(acl_buffer, 0, con_handle | (pb << 12) | (0 << 14)); 4327f107edaSMatthias Ringwald // 2 - ACL length 4337f107edaSMatthias Ringwald little_endian_store_16(acl_buffer, 2, len + 4); 4347f107edaSMatthias Ringwald // 4 - L2CAP packet length 4357f107edaSMatthias Ringwald little_endian_store_16(acl_buffer, 4, len + 0); 4367f107edaSMatthias Ringwald // 6 - L2CAP channel DEST 4377f107edaSMatthias Ringwald little_endian_store_16(acl_buffer, 6, remote_cid); 4387f107edaSMatthias Ringwald } 43968a0fcf7S[email protected] 440b1d43497Smatthias.ringwald int l2cap_send_prepared(uint16_t local_cid, uint16_t len){ 441b1d43497Smatthias.ringwald 442c8b9416aS[email protected] if (!hci_is_packet_buffer_reserved()){ 443c8b9416aS[email protected] log_error("l2cap_send_prepared called without reserving packet first"); 444c8b9416aS[email protected] return BTSTACK_ACL_BUFFERS_FULL; 445c8b9416aS[email protected] } 446c8b9416aS[email protected] 44758de5610Smatthias.ringwald l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 448b1d43497Smatthias.ringwald if (!channel) { 4499da54300S[email protected] log_error("l2cap_send_prepared no channel for cid 0x%02x", local_cid); 450b1d43497Smatthias.ringwald return -1; // TODO: define error 4516218e6f1Smatthias.ringwald } 4526218e6f1Smatthias.ringwald 453fc64f94aSMatthias Ringwald if (!hci_can_send_prepared_acl_packet_now(channel->con_handle)){ 4549da54300S[email protected] log_info("l2cap_send_prepared cid 0x%02x, cannot send", local_cid); 455a35252c8S[email protected] return BTSTACK_ACL_BUFFERS_FULL; 456a35252c8S[email protected] } 457a35252c8S[email protected] 458fc64f94aSMatthias Ringwald log_debug("l2cap_send_prepared cid 0x%02x, handle %u, 1 credit used", local_cid, channel->con_handle); 459b1d43497Smatthias.ringwald 460facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 4617f107edaSMatthias Ringwald l2cap_setup_header(acl_buffer, channel->con_handle, channel->remote_cid, len); 46258de5610Smatthias.ringwald // send 4637f107edaSMatthias Ringwald return hci_send_acl_packet_buffer(len+8); 46458de5610Smatthias.ringwald } 46558de5610Smatthias.ringwald 466fc64f94aSMatthias Ringwald int l2cap_send_prepared_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint16_t len){ 4672149f12eSmatthias.ringwald 468c8b9416aS[email protected] if (!hci_is_packet_buffer_reserved()){ 469c8b9416aS[email protected] log_error("l2cap_send_prepared_connectionless called without reserving packet first"); 4702149f12eSmatthias.ringwald return BTSTACK_ACL_BUFFERS_FULL; 4712149f12eSmatthias.ringwald } 4722149f12eSmatthias.ringwald 473fc64f94aSMatthias Ringwald if (!hci_can_send_prepared_acl_packet_now(con_handle)){ 474fc64f94aSMatthias Ringwald log_info("l2cap_send_prepared_connectionless handle 0x%02x, cid 0x%02x, cannot send", con_handle, cid); 475c8b9416aS[email protected] return BTSTACK_ACL_BUFFERS_FULL; 476c8b9416aS[email protected] } 477c8b9416aS[email protected] 478fc64f94aSMatthias Ringwald log_debug("l2cap_send_prepared_connectionless handle %u, cid 0x%02x", con_handle, cid); 4792149f12eSmatthias.ringwald 480facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 4817f107edaSMatthias Ringwald l2cap_setup_header(acl_buffer, con_handle, cid, len); 4822149f12eSmatthias.ringwald // send 4837f107edaSMatthias Ringwald return hci_send_acl_packet_buffer(len+8); 4842149f12eSmatthias.ringwald } 4852149f12eSmatthias.ringwald 486ce8f182eSMatthias Ringwald int l2cap_send(uint16_t local_cid, uint8_t *data, uint16_t len){ 487b1d43497Smatthias.ringwald 488a35252c8S[email protected] l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 489a35252c8S[email protected] if (!channel) { 490ce8f182eSMatthias Ringwald log_error("l2cap_send no channel for cid 0x%02x", local_cid); 491a35252c8S[email protected] return -1; // TODO: define error 492a35252c8S[email protected] } 493a35252c8S[email protected] 494f0efaa57S[email protected] if (len > channel->remote_mtu){ 495ce8f182eSMatthias Ringwald log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 496f0efaa57S[email protected] return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 497f0efaa57S[email protected] } 498f0efaa57S[email protected] 499fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)){ 500ce8f182eSMatthias Ringwald log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 501b1d43497Smatthias.ringwald return BTSTACK_ACL_BUFFERS_FULL; 502b1d43497Smatthias.ringwald } 503b1d43497Smatthias.ringwald 5042a373862S[email protected] hci_reserve_packet_buffer(); 505facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 506b1d43497Smatthias.ringwald 507b1d43497Smatthias.ringwald memcpy(&acl_buffer[8], data, len); 508b1d43497Smatthias.ringwald 509b1d43497Smatthias.ringwald return l2cap_send_prepared(local_cid, len); 510b1d43497Smatthias.ringwald } 511b1d43497Smatthias.ringwald 512fc64f94aSMatthias Ringwald int l2cap_send_connectionless(hci_con_handle_t con_handle, uint16_t cid, uint8_t *data, uint16_t len){ 5132149f12eSmatthias.ringwald 514fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(con_handle)){ 515ce8f182eSMatthias Ringwald log_info("l2cap_send cid 0x%02x, cannot send", cid); 5162149f12eSmatthias.ringwald return BTSTACK_ACL_BUFFERS_FULL; 5172149f12eSmatthias.ringwald } 5182149f12eSmatthias.ringwald 5192a373862S[email protected] hci_reserve_packet_buffer(); 520facf93fdS[email protected] uint8_t *acl_buffer = hci_get_outgoing_packet_buffer(); 5212149f12eSmatthias.ringwald 5222149f12eSmatthias.ringwald memcpy(&acl_buffer[8], data, len); 5232149f12eSmatthias.ringwald 524fc64f94aSMatthias Ringwald return l2cap_send_prepared_connectionless(con_handle, cid, len); 5252149f12eSmatthias.ringwald } 5262149f12eSmatthias.ringwald 527fc64f94aSMatthias Ringwald int l2cap_send_echo_request(hci_con_handle_t con_handle, uint8_t *data, uint16_t len){ 528fc64f94aSMatthias Ringwald return l2cap_send_signaling_packet(con_handle, ECHO_REQUEST, 0x77, len, data); 5290e37e417S[email protected] } 5300e37e417S[email protected] 53128ca2b46S[email protected] static inline void channelStateVarSetFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 53228ca2b46S[email protected] channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var | flag); 53328ca2b46S[email protected] } 53428ca2b46S[email protected] 53528ca2b46S[email protected] static inline void channelStateVarClearFlag(l2cap_channel_t *channel, L2CAP_CHANNEL_STATE_VAR flag){ 53628ca2b46S[email protected] channel->state_var = (L2CAP_CHANNEL_STATE_VAR) (channel->state_var & ~flag); 53728ca2b46S[email protected] } 53828ca2b46S[email protected] 53928ca2b46S[email protected] 540b1d43497Smatthias.ringwald 5418158c421Smatthias.ringwald // MARK: L2CAP_RUN 5422cd0be45Smatthias.ringwald // process outstanding signaling tasks 5437f02f414SMatthias Ringwald static void l2cap_run(void){ 5442b83fb7dSmatthias.ringwald 54522c29ab4SMatthias Ringwald // log_info("l2cap_run: entered"); 54622c29ab4SMatthias Ringwald 5472b83fb7dSmatthias.ringwald // check pending signaling responses 5482b83fb7dSmatthias.ringwald while (signaling_responses_pending){ 5492b83fb7dSmatthias.ringwald 5502b83fb7dSmatthias.ringwald hci_con_handle_t handle = signaling_responses[0].handle; 551a35252c8S[email protected] 552a35252c8S[email protected] if (!hci_can_send_acl_packet_now(handle)) break; 553a35252c8S[email protected] 5542b83fb7dSmatthias.ringwald uint8_t sig_id = signaling_responses[0].sig_id; 5552b360848Smatthias.ringwald uint16_t infoType = signaling_responses[0].data; // INFORMATION_REQUEST 55663a7246aSmatthias.ringwald uint16_t result = signaling_responses[0].data; // CONNECTION_REQUEST, COMMAND_REJECT 557f53da564S[email protected] uint8_t response_code = signaling_responses[0].code; 5582b83fb7dSmatthias.ringwald 559f53da564S[email protected] // remove first item before sending (to avoid sending response mutliple times) 560f53da564S[email protected] signaling_responses_pending--; 561f53da564S[email protected] int i; 562f53da564S[email protected] for (i=0; i < signaling_responses_pending; i++){ 563f53da564S[email protected] memcpy(&signaling_responses[i], &signaling_responses[i+1], sizeof(l2cap_signaling_response_t)); 564f53da564S[email protected] } 565f53da564S[email protected] 566f53da564S[email protected] switch (response_code){ 5672b360848Smatthias.ringwald case CONNECTION_REQUEST: 5682b360848Smatthias.ringwald l2cap_send_signaling_packet(handle, CONNECTION_RESPONSE, sig_id, 0, 0, result, 0); 5692bd8b7e7S[email protected] // also disconnect if result is 0x0003 - security blocked 5704d816277S[email protected] if (result == 0x0003){ 5712bd8b7e7S[email protected] hci_disconnect_security_block(handle); 5724d816277S[email protected] } 5732b360848Smatthias.ringwald break; 5742b83fb7dSmatthias.ringwald case ECHO_REQUEST: 5752b83fb7dSmatthias.ringwald l2cap_send_signaling_packet(handle, ECHO_RESPONSE, sig_id, 0, NULL); 5762b83fb7dSmatthias.ringwald break; 5772b83fb7dSmatthias.ringwald case INFORMATION_REQUEST: 5783b0484b3S[email protected] switch (infoType){ 5793b0484b3S[email protected] case 1: { // Connectionless MTU 5803b0484b3S[email protected] uint16_t connectionless_mtu = hci_max_acl_data_packet_length(); 5813b0484b3S[email protected] l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(connectionless_mtu), &connectionless_mtu); 5823b0484b3S[email protected] break; 5833b0484b3S[email protected] } 5843b0484b3S[email protected] case 2: { // Extended Features Supported 585462e630dS[email protected] // extended features request supported, features: fixed channels, unicast connectionless data reception 586462e630dS[email protected] uint32_t features = 0x280; 5873b0484b3S[email protected] l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(features), &features); 5883b0484b3S[email protected] break; 5893b0484b3S[email protected] } 5903b0484b3S[email protected] case 3: { // Fixed Channels Supported 5913b0484b3S[email protected] uint8_t map[8]; 5923b0484b3S[email protected] memset(map, 0, 8); 593288636a2SMatthias Ringwald map[0] = 0x06; // L2CAP Signaling Channel (0x02) + Connectionless reception (0x04) 5943b0484b3S[email protected] l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 0, sizeof(map), &map); 5953b0484b3S[email protected] break; 5963b0484b3S[email protected] } 5973b0484b3S[email protected] default: 5982b83fb7dSmatthias.ringwald // all other types are not supported 5992b83fb7dSmatthias.ringwald l2cap_send_signaling_packet(handle, INFORMATION_RESPONSE, sig_id, infoType, 1, 0, NULL); 6003b0484b3S[email protected] break; 6012b83fb7dSmatthias.ringwald } 6022b83fb7dSmatthias.ringwald break; 60363a7246aSmatthias.ringwald case COMMAND_REJECT: 6045ca8d57bS[email protected] l2cap_send_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 60563f0ac45SMatthias Ringwald break; 606a9a4c409SMatthias Ringwald #ifdef ENABLE_BLE 60763f0ac45SMatthias Ringwald case LE_CREDIT_BASED_CONNECTION_REQUEST: 60863f0ac45SMatthias Ringwald l2cap_send_le_signaling_packet(handle, LE_CREDIT_BASED_CONNECTION_RESPONSE, sig_id, 0, 0, 0, 0, result); 60963f0ac45SMatthias Ringwald break; 61070efece1S[email protected] case COMMAND_REJECT_LE: 61170efece1S[email protected] l2cap_send_le_signaling_packet(handle, COMMAND_REJECT, sig_id, result, 0, NULL); 61263a7246aSmatthias.ringwald break; 61370efece1S[email protected] #endif 6142b83fb7dSmatthias.ringwald default: 6152b83fb7dSmatthias.ringwald // should not happen 6162b83fb7dSmatthias.ringwald break; 6172b83fb7dSmatthias.ringwald } 6182b83fb7dSmatthias.ringwald } 6192b83fb7dSmatthias.ringwald 620ae280e73Smatthias.ringwald uint8_t config_options[4]; 621665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 622665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 623665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 624baf94f06S[email protected] 625665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 62622c29ab4SMatthias Ringwald // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 6272cd0be45Smatthias.ringwald switch (channel->state){ 6282cd0be45Smatthias.ringwald 629df3354fcS[email protected] case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 630ad671560S[email protected] case L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT: 631fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 632a00031e2S[email protected] if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND) { 633ad671560S[email protected] channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND); 634fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 1, 0); 635ad671560S[email protected] } 636ad671560S[email protected] break; 637ad671560S[email protected] 63802b22dc4Smatthias.ringwald case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 639baf94f06S[email protected] if (!hci_can_send_command_packet_now()) break; 64064472d52Smatthias.ringwald // send connection request - set state first 64164472d52Smatthias.ringwald channel->state = L2CAP_STATE_WAIT_CONNECTION_COMPLETE; 64202b22dc4Smatthias.ringwald // BD_ADDR, Packet_Type, Page_Scan_Repetition_Mode, Reserved, Clock_Offset, Allow_Role_Switch 6438f8108aaSmatthias.ringwald hci_send_cmd(&hci_create_connection, channel->address, hci_usable_acl_packet_types(), 0, 0, 0, 1); 64402b22dc4Smatthias.ringwald break; 64502b22dc4Smatthias.ringwald 646e7ff783cSmatthias.ringwald case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE: 647fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 64822c29ab4SMatthias Ringwald channel->state = L2CAP_STATE_INVALID; 649fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, channel->reason, 0); 650e7ff783cSmatthias.ringwald // discard channel - l2cap_finialize_channel_close without sending l2cap close event 6519dcb2fb2S[email protected] l2cap_stop_rtx(channel); 652665d90f2SMatthias Ringwald btstack_linked_list_iterator_remove(&it); 653d3a9df87Smatthias.ringwald btstack_memory_l2cap_channel_free(channel); 654e7ff783cSmatthias.ringwald break; 655e7ff783cSmatthias.ringwald 656552d92a1Smatthias.ringwald case L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT: 657fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 658fa8473a4Smatthias.ringwald channel->state = L2CAP_STATE_CONFIG; 65928ca2b46S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 660fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid, 0, 0); 661552d92a1Smatthias.ringwald break; 662552d92a1Smatthias.ringwald 6636fdcc387Smatthias.ringwald case L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST: 664fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 6656fdcc387Smatthias.ringwald // success, start l2cap handshake 666b1988dceSmatthias.ringwald channel->local_sig_id = l2cap_next_sig_id(); 6676fdcc387Smatthias.ringwald channel->state = L2CAP_STATE_WAIT_CONNECT_RSP; 668fc64f94aSMatthias Ringwald l2cap_send_signaling_packet( channel->con_handle, CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid); 6695932bd7cS[email protected] l2cap_start_rtx(channel); 6706fdcc387Smatthias.ringwald break; 6716fdcc387Smatthias.ringwald 672fa8473a4Smatthias.ringwald case L2CAP_STATE_CONFIG: 673fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 67473cf2b3dSmatthias.ringwald if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP){ 67563a7246aSmatthias.ringwald uint16_t flags = 0; 67628ca2b46S[email protected] channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 67763a7246aSmatthias.ringwald if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT) { 67863a7246aSmatthias.ringwald flags = 1; 67963a7246aSmatthias.ringwald } else { 68028ca2b46S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP); 68163a7246aSmatthias.ringwald } 68263a7246aSmatthias.ringwald if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID){ 683fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, L2CAP_CONF_RESULT_UNKNOWN_OPTIONS, 0, NULL); 68463a7246aSmatthias.ringwald } else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU){ 68563a7246aSmatthias.ringwald config_options[0] = 1; // MTU 68663a7246aSmatthias.ringwald config_options[1] = 2; // len param 687f8fbdce0SMatthias Ringwald little_endian_store_16( (uint8_t*)&config_options, 2, channel->remote_mtu); 688fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 4, &config_options); 68963a7246aSmatthias.ringwald channelStateVarClearFlag(channel,L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 69063a7246aSmatthias.ringwald } else { 691fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_RESPONSE, channel->remote_sig_id, channel->remote_cid, flags, 0, 0, NULL); 69263a7246aSmatthias.ringwald } 69363a7246aSmatthias.ringwald channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 694fa8473a4Smatthias.ringwald } 69573cf2b3dSmatthias.ringwald else if (channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ){ 69628ca2b46S[email protected] channelStateVarClearFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 69728ca2b46S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SENT_CONF_REQ); 698b1988dceSmatthias.ringwald channel->local_sig_id = l2cap_next_sig_id(); 699ae280e73Smatthias.ringwald config_options[0] = 1; // MTU 700ae280e73Smatthias.ringwald config_options[1] = 2; // len param 701f8fbdce0SMatthias Ringwald little_endian_store_16( (uint8_t*)&config_options, 2, channel->local_mtu); 702fc64f94aSMatthias Ringwald l2cap_send_signaling_packet(channel->con_handle, CONFIGURE_REQUEST, channel->local_sig_id, channel->remote_cid, 0, 4, &config_options); 7035932bd7cS[email protected] l2cap_start_rtx(channel); 704fa8473a4Smatthias.ringwald } 705fa8473a4Smatthias.ringwald if (l2cap_channel_ready_for_open(channel)){ 706552d92a1Smatthias.ringwald channel->state = L2CAP_STATE_OPEN; 707552d92a1Smatthias.ringwald l2cap_emit_channel_opened(channel, 0); // success 708fa8473a4Smatthias.ringwald } 709552d92a1Smatthias.ringwald break; 710552d92a1Smatthias.ringwald 711e7ff783cSmatthias.ringwald case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 712fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 71322c29ab4SMatthias Ringwald channel->state = L2CAP_STATE_INVALID; 714fc64f94aSMatthias Ringwald l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 7155932bd7cS[email protected] // we don't start an RTX timer for a disconnect - there's no point in closing the channel if the other side doesn't respond :) 716756102d3Smatthias.ringwald l2cap_finialize_channel_close(channel); // -- remove from list 717e7ff783cSmatthias.ringwald break; 718e7ff783cSmatthias.ringwald 719e7ff783cSmatthias.ringwald case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 720fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 721b1988dceSmatthias.ringwald channel->local_sig_id = l2cap_next_sig_id(); 7222cd0be45Smatthias.ringwald channel->state = L2CAP_STATE_WAIT_DISCONNECT; 723fc64f94aSMatthias Ringwald l2cap_send_signaling_packet( channel->con_handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 7242cd0be45Smatthias.ringwald break; 7252cd0be45Smatthias.ringwald default: 7262cd0be45Smatthias.ringwald break; 7272cd0be45Smatthias.ringwald } 7282cd0be45Smatthias.ringwald } 729da886c03S[email protected] 730a9a4c409SMatthias Ringwald #ifdef ENABLE_BLE 731cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 732efedfb4cSMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 733efedfb4cSMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 7347f107edaSMatthias Ringwald uint8_t * acl_buffer; 7357f107edaSMatthias Ringwald uint8_t * l2cap_payload; 7367f107edaSMatthias Ringwald uint16_t pos; 7377f107edaSMatthias Ringwald uint16_t payload_size; 738efedfb4cSMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 739efedfb4cSMatthias Ringwald // log_info("l2cap_run: channel %p, state %u, var 0x%02x", channel, channel->state, channel->state_var); 740efedfb4cSMatthias Ringwald switch (channel->state){ 7415cb87675SMatthias Ringwald case L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST: 7425cb87675SMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 7435cb87675SMatthias Ringwald channel->state = L2CAP_STATE_WAIT_LE_CONNECTION_RESPONSE; 7445cb87675SMatthias Ringwald // le psm, source cid, mtu, mps, initial credits 7451b8b8d05SMatthias Ringwald channel->local_sig_id = l2cap_next_sig_id(); 74663f0ac45SMatthias Ringwald channel->credits_incoming = channel->new_credits_incoming; 74763f0ac45SMatthias Ringwald channel->new_credits_incoming = 0; 74863f0ac45SMatthias Ringwald l2cap_send_le_signaling_packet( channel->con_handle, LE_CREDIT_BASED_CONNECTION_REQUEST, channel->local_sig_id, channel->psm, channel->local_cid, channel->local_mtu, 23, channel->credits_incoming); 7495cb87675SMatthias Ringwald break; 75023017473SMatthias Ringwald case L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_ACCEPT: 75123017473SMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 75223017473SMatthias Ringwald // TODO: support larger MPS 75323017473SMatthias Ringwald channel->state = L2CAP_STATE_OPEN; 75463f0ac45SMatthias Ringwald channel->credits_incoming = channel->new_credits_incoming; 75563f0ac45SMatthias Ringwald channel->new_credits_incoming = 0; 75663f0ac45SMatthias Ringwald l2cap_send_le_signaling_packet(channel->con_handle, LE_CREDIT_BASED_CONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->local_mtu, 23, channel->credits_incoming, 0); 75764e11ca9SMatthias Ringwald // notify client 75844276248SMatthias Ringwald l2cap_emit_le_channel_opened(channel, 0); 75923017473SMatthias Ringwald break; 760e7d0c9aaSMatthias Ringwald case L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_DECLINE: 761e7d0c9aaSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 762e7d0c9aaSMatthias Ringwald channel->state = L2CAP_STATE_INVALID; 76363f0ac45SMatthias Ringwald l2cap_send_le_signaling_packet(channel->con_handle, LE_CREDIT_BASED_CONNECTION_RESPONSE, channel->remote_sig_id, 0, 0, 0, 0, channel->reason); 764e7d0c9aaSMatthias Ringwald // discard channel - l2cap_finialize_channel_close without sending l2cap close event 765e7d0c9aaSMatthias Ringwald l2cap_stop_rtx(channel); 766e7d0c9aaSMatthias Ringwald btstack_linked_list_iterator_remove(&it); 767e7d0c9aaSMatthias Ringwald btstack_memory_l2cap_channel_free(channel); 768e7d0c9aaSMatthias Ringwald break; 7697f107edaSMatthias Ringwald case L2CAP_STATE_OPEN: 77085aeef60SMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 77185aeef60SMatthias Ringwald 77285aeef60SMatthias Ringwald // send credits 77385aeef60SMatthias Ringwald if (channel->new_credits_incoming){ 77485aeef60SMatthias Ringwald log_info("l2cap: sending %u credits", channel->new_credits_incoming); 77585aeef60SMatthias Ringwald channel->local_sig_id = l2cap_next_sig_id(); 77685aeef60SMatthias Ringwald uint16_t new_credits = channel->new_credits_incoming; 77785aeef60SMatthias Ringwald channel->new_credits_incoming = 0; 77885aeef60SMatthias Ringwald channel->credits_incoming += new_credits; 77985aeef60SMatthias Ringwald l2cap_send_le_signaling_packet(channel->con_handle, LE_FLOW_CONTROL_CREDIT, channel->local_sig_id, channel->remote_cid, new_credits); 78085aeef60SMatthias Ringwald break; 78185aeef60SMatthias Ringwald } 78285aeef60SMatthias Ringwald 78385aeef60SMatthias Ringwald // send data 7847f107edaSMatthias Ringwald if (!channel->send_sdu_buffer) break; 7857f107edaSMatthias Ringwald if (!channel->credits_outgoing) break; 78685aeef60SMatthias Ringwald 7877f107edaSMatthias Ringwald // send part of SDU 7887f107edaSMatthias Ringwald hci_reserve_packet_buffer(); 7897f107edaSMatthias Ringwald acl_buffer = hci_get_outgoing_packet_buffer(); 7907f107edaSMatthias Ringwald l2cap_payload = acl_buffer + 8; 7917f107edaSMatthias Ringwald pos = 0; 7927f107edaSMatthias Ringwald if (!channel->send_sdu_pos){ 7937f107edaSMatthias Ringwald // store SDU len 7947f107edaSMatthias Ringwald channel->send_sdu_pos += 2; 7957f107edaSMatthias Ringwald little_endian_store_16(l2cap_payload, pos, channel->send_sdu_len); 7967f107edaSMatthias Ringwald pos += 2; 7977f107edaSMatthias Ringwald } 7987f107edaSMatthias Ringwald payload_size = btstack_min(channel->send_sdu_len + 2 - channel->send_sdu_pos, channel->remote_mps - pos); 79985aeef60SMatthias Ringwald log_info("len %u, pos %u => payload %u, credits %u", channel->send_sdu_len, channel->send_sdu_pos, payload_size, channel->credits_outgoing); 8007f107edaSMatthias Ringwald memcpy(&l2cap_payload[pos], &channel->send_sdu_buffer[channel->send_sdu_pos-2], payload_size); // -2 for virtual SDU len 8017f107edaSMatthias Ringwald pos += payload_size; 8027f107edaSMatthias Ringwald channel->send_sdu_pos += payload_size; 80363f0ac45SMatthias Ringwald l2cap_setup_header(acl_buffer, channel->con_handle, channel->remote_cid, pos); 8047f107edaSMatthias Ringwald // done 8057f107edaSMatthias Ringwald 80685aeef60SMatthias Ringwald channel->credits_outgoing--; 8077f107edaSMatthias Ringwald 8087f107edaSMatthias Ringwald if (channel->send_sdu_pos >= channel->send_sdu_len + 2){ 8097f107edaSMatthias Ringwald channel->send_sdu_buffer = NULL; 81044276248SMatthias Ringwald // send done event 81144276248SMatthias Ringwald l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_LE_PACKET_SENT); 81244276248SMatthias Ringwald // inform about can send now 81344276248SMatthias Ringwald l2cap_le_notify_channel_can_send(channel); 8147f107edaSMatthias Ringwald } 8157f107edaSMatthias Ringwald hci_send_acl_packet_buffer(8 + pos); 8167f107edaSMatthias Ringwald break; 817828a7f7aSMatthias Ringwald case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 818828a7f7aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 819828a7f7aSMatthias Ringwald channel->local_sig_id = l2cap_next_sig_id(); 820828a7f7aSMatthias Ringwald channel->state = L2CAP_STATE_WAIT_DISCONNECT; 821828a7f7aSMatthias Ringwald l2cap_send_le_signaling_packet( channel->con_handle, DISCONNECTION_REQUEST, channel->local_sig_id, channel->remote_cid, channel->local_cid); 822828a7f7aSMatthias Ringwald break; 823828a7f7aSMatthias Ringwald case L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE: 824828a7f7aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) break; 825828a7f7aSMatthias Ringwald channel->state = L2CAP_STATE_INVALID; 826828a7f7aSMatthias Ringwald l2cap_send_le_signaling_packet( channel->con_handle, DISCONNECTION_RESPONSE, channel->remote_sig_id, channel->local_cid, channel->remote_cid); 827828a7f7aSMatthias Ringwald l2cap_le_finialize_channel_close(channel); // -- remove from list 828828a7f7aSMatthias Ringwald break; 829efedfb4cSMatthias Ringwald default: 830efedfb4cSMatthias Ringwald break; 831efedfb4cSMatthias Ringwald } 832efedfb4cSMatthias Ringwald } 833efedfb4cSMatthias Ringwald 834da886c03S[email protected] // send l2cap con paramter update if necessary 835da886c03S[email protected] hci_connections_get_iterator(&it); 836665d90f2SMatthias Ringwald while(btstack_linked_list_iterator_has_next(&it)){ 837665d90f2SMatthias Ringwald hci_connection_t * connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 8385d14fa8fSMatthias Ringwald if (connection->address_type != BD_ADDR_TYPE_LE_PUBLIC && connection->address_type != BD_ADDR_TYPE_LE_RANDOM) continue; 839b68d7bc3SMatthias Ringwald if (!hci_can_send_acl_packet_now(connection->con_handle)) continue; 840da886c03S[email protected] switch (connection->le_con_parameter_update_state){ 841b68d7bc3SMatthias Ringwald case CON_PARAMETER_UPDATE_SEND_REQUEST: 842b68d7bc3SMatthias Ringwald connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 843b68d7bc3SMatthias Ringwald l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_REQUEST, connection->le_con_param_update_identifier, 844b68d7bc3SMatthias Ringwald connection->le_conn_interval_min, connection->le_conn_interval_max, connection->le_conn_latency, connection->le_supervision_timeout); 845b68d7bc3SMatthias Ringwald break; 846da886c03S[email protected] case CON_PARAMETER_UPDATE_SEND_RESPONSE: 847b68d7bc3SMatthias Ringwald connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_CHANGE_HCI_CON_PARAMETERS; 848b68d7bc3SMatthias Ringwald l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 0); 849da886c03S[email protected] break; 850da886c03S[email protected] case CON_PARAMETER_UPDATE_DENY: 851b68d7bc3SMatthias Ringwald connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_NONE; 852b68d7bc3SMatthias Ringwald l2cap_send_le_signaling_packet(connection->con_handle, CONNECTION_PARAMETER_UPDATE_RESPONSE, connection->le_con_param_update_identifier, 1); 853da886c03S[email protected] break; 854da886c03S[email protected] default: 855da886c03S[email protected] break; 856da886c03S[email protected] } 857da886c03S[email protected] } 8584d7157c3S[email protected] #endif 859cab29d48SMatthias Ringwald #endif 860da886c03S[email protected] 86122c29ab4SMatthias Ringwald // log_info("l2cap_run: exit"); 8622cd0be45Smatthias.ringwald } 8632cd0be45Smatthias.ringwald 8644aa9e837Smatthias.ringwald uint16_t l2cap_max_mtu(void){ 8654ff786cfS[email protected] return HCI_ACL_PAYLOAD_SIZE - L2CAP_HEADER_SIZE; 866fa8c92f6Smatthias.ringwald } 867fa8c92f6Smatthias.ringwald 86871de195eSMatthias Ringwald uint16_t l2cap_max_le_mtu(void){ 8694ff786cfS[email protected] return l2cap_max_mtu(); 870e5e1518dS[email protected] } 871e5e1518dS[email protected] 872fc64f94aSMatthias Ringwald static void l2cap_handle_connection_complete(hci_con_handle_t con_handle, l2cap_channel_t * channel){ 8732df5dadcS[email protected] if (channel->state == L2CAP_STATE_WAIT_CONNECTION_COMPLETE || channel->state == L2CAP_STATE_WILL_SEND_CREATE_CONNECTION) { 8745533f01eS[email protected] log_info("l2cap_handle_connection_complete expected state"); 8752df5dadcS[email protected] // success, start l2cap handshake 876fc64f94aSMatthias Ringwald channel->con_handle = con_handle; 8772df5dadcS[email protected] // check remote SSP feature first 8782df5dadcS[email protected] channel->state = L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES; 8792df5dadcS[email protected] } 8802df5dadcS[email protected] } 8812df5dadcS[email protected] 8822df5dadcS[email protected] static void l2cap_handle_remote_supported_features_received(l2cap_channel_t * channel){ 8832df5dadcS[email protected] if (channel->state != L2CAP_STATE_WAIT_REMOTE_SUPPORTED_FEATURES) return; 8842df5dadcS[email protected] 8852df5dadcS[email protected] // we have been waiting for remote supported features, if both support SSP, 886ac301f95S[email protected] log_info("l2cap received remote supported features, sec_level_0_allowed for psm %u = %u", channel->psm, l2cap_security_level_0_allowed_for_PSM(channel->psm)); 887fc64f94aSMatthias Ringwald if (gap_ssp_supported_on_both_sides(channel->con_handle) && !l2cap_security_level_0_allowed_for_PSM(channel->psm)){ 8882df5dadcS[email protected] // request security level 2 8892df5dadcS[email protected] channel->state = L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE; 890fc64f94aSMatthias Ringwald gap_request_security_level(channel->con_handle, LEVEL_2); 8912df5dadcS[email protected] return; 8922df5dadcS[email protected] } 8932df5dadcS[email protected] // fine, go ahead 8942df5dadcS[email protected] channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 8952df5dadcS[email protected] } 8962df5dadcS[email protected] 897da144af5SMatthias Ringwald static l2cap_channel_t * l2cap_create_channel_entry(btstack_packet_handler_t packet_handler, bd_addr_t address, bd_addr_type_t address_type, 898da144af5SMatthias Ringwald uint16_t psm, uint16_t local_mtu, gap_security_level_t security_level){ 899da144af5SMatthias Ringwald 900da144af5SMatthias Ringwald l2cap_channel_t * channel = btstack_memory_l2cap_channel_get(); 901da144af5SMatthias Ringwald if (!channel) { 902da144af5SMatthias Ringwald return NULL; 903da144af5SMatthias Ringwald } 904da144af5SMatthias Ringwald 905da144af5SMatthias Ringwald // Init memory (make valgrind happy) 906da144af5SMatthias Ringwald memset(channel, 0, sizeof(l2cap_channel_t)); 907da144af5SMatthias Ringwald 908da144af5SMatthias Ringwald // fill in 909da144af5SMatthias Ringwald channel->packet_handler = packet_handler; 910da144af5SMatthias Ringwald bd_addr_copy(channel->address, address); 911da144af5SMatthias Ringwald channel->address_type = address_type; 912da144af5SMatthias Ringwald channel->psm = psm; 913da144af5SMatthias Ringwald channel->local_mtu = local_mtu; 914da144af5SMatthias Ringwald channel->remote_mtu = L2CAP_MINIMAL_MTU; 915da144af5SMatthias Ringwald channel->required_security_level = security_level; 916da144af5SMatthias Ringwald 917da144af5SMatthias Ringwald // 918da144af5SMatthias Ringwald channel->local_cid = l2cap_next_local_cid(); 919da144af5SMatthias Ringwald channel->con_handle = 0; 920da144af5SMatthias Ringwald 921da144af5SMatthias Ringwald // set initial state 922da144af5SMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_CREATE_CONNECTION; 923da144af5SMatthias Ringwald channel->state_var = L2CAP_CHANNEL_STATE_VAR_NONE; 924da144af5SMatthias Ringwald channel->remote_sig_id = L2CAP_SIG_ID_INVALID; 925da144af5SMatthias Ringwald channel->local_sig_id = L2CAP_SIG_ID_INVALID; 926da144af5SMatthias Ringwald return channel; 927da144af5SMatthias Ringwald } 928da144af5SMatthias Ringwald 9299077cb15SMatthias Ringwald /** 9309077cb15SMatthias Ringwald * @brief Creates L2CAP channel to the PSM of a remote device with baseband address. A new baseband connection will be initiated if necessary. 9319077cb15SMatthias Ringwald * @param packet_handler 9329077cb15SMatthias Ringwald * @param address 9339077cb15SMatthias Ringwald * @param psm 9349077cb15SMatthias Ringwald * @param mtu 9359077cb15SMatthias Ringwald * @param local_cid 9369077cb15SMatthias Ringwald */ 9379077cb15SMatthias Ringwald 938da144af5SMatthias Ringwald uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t local_mtu, uint16_t * out_local_cid){ 939da144af5SMatthias Ringwald log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, local_mtu); 940da144af5SMatthias Ringwald 941da144af5SMatthias Ringwald if (local_mtu > l2cap_max_mtu()) { 942da144af5SMatthias Ringwald local_mtu = l2cap_max_mtu(); 943da144af5SMatthias Ringwald } 944da144af5SMatthias Ringwald 945da144af5SMatthias Ringwald l2cap_channel_t * channel = l2cap_create_channel_entry(channel_packet_handler, address, BD_ADDR_TYPE_CLASSIC, psm, local_mtu, LEVEL_0); 946fc64f94aSMatthias Ringwald if (!channel) { 9479077cb15SMatthias Ringwald return BTSTACK_MEMORY_ALLOC_FAILED; 9489077cb15SMatthias Ringwald } 9499077cb15SMatthias Ringwald 9509077cb15SMatthias Ringwald // add to connections list 951fc64f94aSMatthias Ringwald btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 9529077cb15SMatthias Ringwald 9539077cb15SMatthias Ringwald // store local_cid 9549077cb15SMatthias Ringwald if (out_local_cid){ 955fc64f94aSMatthias Ringwald *out_local_cid = channel->local_cid; 9569077cb15SMatthias Ringwald } 9579077cb15SMatthias Ringwald 9589077cb15SMatthias Ringwald // check if hci connection is already usable 9599077cb15SMatthias Ringwald hci_connection_t * conn = hci_connection_for_bd_addr_and_type(address, BD_ADDR_TYPE_CLASSIC); 9609077cb15SMatthias Ringwald if (conn){ 961add0254bSMatthias Ringwald log_info("l2cap_create_channel, hci connection already exists"); 962fc64f94aSMatthias Ringwald l2cap_handle_connection_complete(conn->con_handle, channel); 9639077cb15SMatthias Ringwald // check if remote supported fearures are already received 9649077cb15SMatthias Ringwald if (conn->bonding_flags & BONDING_RECEIVED_REMOTE_FEATURES) { 965fc64f94aSMatthias Ringwald l2cap_handle_remote_supported_features_received(channel); 9669077cb15SMatthias Ringwald } 9679077cb15SMatthias Ringwald } 9689077cb15SMatthias Ringwald 9699077cb15SMatthias Ringwald l2cap_run(); 9709077cb15SMatthias Ringwald 9719077cb15SMatthias Ringwald return 0; 9729077cb15SMatthias Ringwald } 9739077cb15SMatthias Ringwald 974ce8f182eSMatthias Ringwald void 975ce8f182eSMatthias Ringwald l2cap_disconnect(uint16_t local_cid, uint8_t reason){ 976e0abb8e7S[email protected] log_info("L2CAP_DISCONNECT local_cid 0x%x reason 0x%x", local_cid, reason); 977b35f641cSmatthias.ringwald // find channel for local_cid 978b35f641cSmatthias.ringwald l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 979f62db1e3Smatthias.ringwald if (channel) { 980e7ff783cSmatthias.ringwald channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 981f62db1e3Smatthias.ringwald } 9822cd0be45Smatthias.ringwald // process 9832cd0be45Smatthias.ringwald l2cap_run(); 98443625864Smatthias.ringwald } 9851e6aba47Smatthias.ringwald 986afde0c52Smatthias.ringwald static void l2cap_handle_connection_failed_for_addr(bd_addr_t address, uint8_t status){ 987665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 988665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 989665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 990665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 991058e3d6bSMatthias Ringwald if ( bd_addr_cmp( channel->address, address) != 0) continue; 992c22aecc9S[email protected] // channel for this address found 993c22aecc9S[email protected] switch (channel->state){ 994c22aecc9S[email protected] case L2CAP_STATE_WAIT_CONNECTION_COMPLETE: 995c22aecc9S[email protected] case L2CAP_STATE_WILL_SEND_CREATE_CONNECTION: 996afde0c52Smatthias.ringwald // failure, forward error code 997afde0c52Smatthias.ringwald l2cap_emit_channel_opened(channel, status); 998afde0c52Smatthias.ringwald // discard channel 9999dcb2fb2S[email protected] l2cap_stop_rtx(channel); 1000665d90f2SMatthias Ringwald btstack_linked_list_iterator_remove(&it); 1001d3a9df87Smatthias.ringwald btstack_memory_l2cap_channel_free(channel); 1002c22aecc9S[email protected] break; 1003c22aecc9S[email protected] default: 1004c22aecc9S[email protected] break; 1005afde0c52Smatthias.ringwald } 1006afde0c52Smatthias.ringwald } 1007afde0c52Smatthias.ringwald } 1008afde0c52Smatthias.ringwald 1009afde0c52Smatthias.ringwald static void l2cap_handle_connection_success_for_addr(bd_addr_t address, hci_con_handle_t handle){ 1010665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 1011665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1012665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1013665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1014058e3d6bSMatthias Ringwald if ( ! bd_addr_cmp( channel->address, address) ){ 10152df5dadcS[email protected] l2cap_handle_connection_complete(handle, channel); 1016afde0c52Smatthias.ringwald } 1017afde0c52Smatthias.ringwald } 10186fdcc387Smatthias.ringwald // process 10196fdcc387Smatthias.ringwald l2cap_run(); 1020afde0c52Smatthias.ringwald } 1021b448a0e7Smatthias.ringwald 102233c40538SMatthias Ringwald static void l2cap_notify_channel_can_send(void){ 102333c40538SMatthias Ringwald btstack_linked_list_iterator_t it; 102433c40538SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 102533c40538SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 102633c40538SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 102733c40538SMatthias Ringwald if (!channel->waiting_for_can_send_now) continue; 1028fc64f94aSMatthias Ringwald if (!hci_can_send_acl_packet_now(channel->con_handle)) continue; 102933c40538SMatthias Ringwald channel->waiting_for_can_send_now = 0; 103034e7e577SMatthias Ringwald l2cap_emit_can_send_now(channel->packet_handler, channel->local_cid); 103133c40538SMatthias Ringwald } 10322125de09SMatthias Ringwald 103344276248SMatthias Ringwald 10342125de09SMatthias Ringwald int i; 10352125de09SMatthias Ringwald for (i=0;i<L2CAP_FIXED_CHANNEL_TABLE_SIZE;i++){ 1036773c4106SMatthias Ringwald if (!fixed_channels[i].callback) continue; 10372125de09SMatthias Ringwald if (!fixed_channels[i].waiting_for_can_send_now) continue; 103834e7e577SMatthias Ringwald int can_send; 103934e7e577SMatthias Ringwald if (l2cap_fixed_channel_table_index_is_le(i)){ 104034e7e577SMatthias Ringwald can_send = hci_can_send_acl_le_packet_now(); 104134e7e577SMatthias Ringwald } else { 104234e7e577SMatthias Ringwald can_send = hci_can_send_acl_classic_packet_now(); 104334e7e577SMatthias Ringwald } 104434e7e577SMatthias Ringwald if (!can_send) continue; 104534e7e577SMatthias Ringwald fixed_channels[i].waiting_for_can_send_now = 0; 104634e7e577SMatthias Ringwald l2cap_emit_can_send_now(fixed_channels[i].callback, l2cap_fixed_channel_table_channel_id_for_index(i)); 10472125de09SMatthias Ringwald } 104833c40538SMatthias Ringwald } 104933c40538SMatthias Ringwald 1050d9a7306aSMatthias Ringwald static void l2cap_hci_event_handler(uint8_t packet_type, uint16_t cid, uint8_t *packet, uint16_t size){ 1051afde0c52Smatthias.ringwald 1052afde0c52Smatthias.ringwald bd_addr_t address; 1053afde0c52Smatthias.ringwald hci_con_handle_t handle; 1054665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 10552d00edd4Smatthias.ringwald int hci_con_used; 1056afde0c52Smatthias.ringwald 10570e2df43fSMatthias Ringwald switch(hci_event_packet_get_type(packet)){ 1058afde0c52Smatthias.ringwald 1059afde0c52Smatthias.ringwald // handle connection complete events 1060afde0c52Smatthias.ringwald case HCI_EVENT_CONNECTION_COMPLETE: 1061724d70a2SMatthias Ringwald reverse_bd_addr(&packet[5], address); 1062afde0c52Smatthias.ringwald if (packet[2] == 0){ 1063f8fbdce0SMatthias Ringwald handle = little_endian_read_16(packet, 3); 1064afde0c52Smatthias.ringwald l2cap_handle_connection_success_for_addr(address, handle); 1065afde0c52Smatthias.ringwald } else { 1066afde0c52Smatthias.ringwald l2cap_handle_connection_failed_for_addr(address, packet[2]); 1067afde0c52Smatthias.ringwald } 1068afde0c52Smatthias.ringwald break; 1069afde0c52Smatthias.ringwald 1070afde0c52Smatthias.ringwald // handle successful create connection cancel command 1071afde0c52Smatthias.ringwald case HCI_EVENT_COMMAND_COMPLETE: 1072073bd0faSMatthias Ringwald if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_create_connection_cancel)) { 1073afde0c52Smatthias.ringwald if (packet[5] == 0){ 1074724d70a2SMatthias Ringwald reverse_bd_addr(&packet[6], address); 1075afde0c52Smatthias.ringwald // CONNECTION TERMINATED BY LOCAL HOST (0X16) 1076afde0c52Smatthias.ringwald l2cap_handle_connection_failed_for_addr(address, 0x16); 107703cfbabcSmatthias.ringwald } 10781e6aba47Smatthias.ringwald } 107939d59809Smatthias.ringwald l2cap_run(); // try sending signaling packets first 108039d59809Smatthias.ringwald break; 108139d59809Smatthias.ringwald 108239d59809Smatthias.ringwald case HCI_EVENT_COMMAND_STATUS: 108339d59809Smatthias.ringwald l2cap_run(); // try sending signaling packets first 1084afde0c52Smatthias.ringwald break; 108527a923d0Smatthias.ringwald 10861e6aba47Smatthias.ringwald // handle disconnection complete events 1087afde0c52Smatthias.ringwald case HCI_EVENT_DISCONNECTION_COMPLETE: 1088c22aecc9S[email protected] // send l2cap disconnect events for all channels on this handle and free them 1089f8fbdce0SMatthias Ringwald handle = little_endian_read_16(packet, 3); 1090665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1091665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1092665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1093fc64f94aSMatthias Ringwald if (channel->con_handle != handle) continue; 109415ec09bbSmatthias.ringwald l2cap_emit_channel_closed(channel); 10959dcb2fb2S[email protected] l2cap_stop_rtx(channel); 1096665d90f2SMatthias Ringwald btstack_linked_list_iterator_remove(&it); 1097d3a9df87Smatthias.ringwald btstack_memory_l2cap_channel_free(channel); 109827a923d0Smatthias.ringwald } 1099991fea48SMatthias Ringwald #ifdef ENABLE_BLE 1100991fea48SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 1101991fea48SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1102991fea48SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1103991fea48SMatthias Ringwald if (channel->con_handle != handle) continue; 1104991fea48SMatthias Ringwald l2cap_emit_channel_closed(channel); 1105991fea48SMatthias Ringwald btstack_linked_list_iterator_remove(&it); 1106991fea48SMatthias Ringwald btstack_memory_l2cap_channel_free(channel); 1107991fea48SMatthias Ringwald } 1108991fea48SMatthias Ringwald #endif 1109afde0c52Smatthias.ringwald break; 1110fcadd0caSmatthias.ringwald 111133c40538SMatthias Ringwald // Notify channel packet handler if they can send now 111263fa3374SMatthias Ringwald case HCI_EVENT_TRANSPORT_PACKET_SENT: 11136218e6f1Smatthias.ringwald case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS: 111402b22dc4Smatthias.ringwald l2cap_run(); // try sending signaling packets first 111533c40538SMatthias Ringwald l2cap_notify_channel_can_send(); 11166218e6f1Smatthias.ringwald break; 11176218e6f1Smatthias.ringwald 1118ee091cf1Smatthias.ringwald // HCI Connection Timeouts 1119afde0c52Smatthias.ringwald case L2CAP_EVENT_TIMEOUT_CHECK: 1120f8fbdce0SMatthias Ringwald handle = little_endian_read_16(packet, 2); 1121bd04d84aSMatthias Ringwald if (gap_get_connection_type(handle) != GAP_CONNECTION_ACL) break; 112280ca58a0Smatthias.ringwald if (hci_authentication_active_for_handle(handle)) break; 11232d00edd4Smatthias.ringwald hci_con_used = 0; 1124665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1125665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1126665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1127fc64f94aSMatthias Ringwald if (channel->con_handle != handle) continue; 11282d00edd4Smatthias.ringwald hci_con_used = 1; 1129c22aecc9S[email protected] break; 1130ee091cf1Smatthias.ringwald } 11312d00edd4Smatthias.ringwald if (hci_con_used) break; 1132d94d3cafS[email protected] if (!hci_can_send_command_packet_now()) break; 11339edc8742Smatthias.ringwald hci_send_cmd(&hci_disconnect, handle, 0x13); // remote closed connection 1134afde0c52Smatthias.ringwald break; 1135ee091cf1Smatthias.ringwald 1136df3354fcS[email protected] case HCI_EVENT_READ_REMOTE_SUPPORTED_FEATURES_COMPLETE: 1137f8fbdce0SMatthias Ringwald handle = little_endian_read_16(packet, 3); 1138665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1139665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1140665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1141fc64f94aSMatthias Ringwald if (channel->con_handle != handle) continue; 11422df5dadcS[email protected] l2cap_handle_remote_supported_features_received(channel); 1143df3354fcS[email protected] break; 1144df3354fcS[email protected] } 1145c22aecc9S[email protected] break; 1146df3354fcS[email protected] 11475611a760SMatthias Ringwald case GAP_EVENT_SECURITY_LEVEL: 1148f8fbdce0SMatthias Ringwald handle = little_endian_read_16(packet, 2); 1149bd63148eS[email protected] log_info("l2cap - security level update"); 1150665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1151665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1152665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1153fc64f94aSMatthias Ringwald if (channel->con_handle != handle) continue; 11545533f01eS[email protected] 1155bd63148eS[email protected] log_info("l2cap - state %u", channel->state); 1156bd63148eS[email protected] 1157e569dfd9SMatthias Ringwald gap_security_level_t actual_level = (gap_security_level_t) packet[4]; 11585533f01eS[email protected] gap_security_level_t required_level = channel->required_security_level; 11595533f01eS[email protected] 1160df3354fcS[email protected] switch (channel->state){ 1161df3354fcS[email protected] case L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE: 11625533f01eS[email protected] if (actual_level >= required_level){ 1163f85a9399S[email protected] channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 116444276248SMatthias Ringwald l2cap_emit_incoming_connection(channel); 11651eb2563eS[email protected] } else { 1166775ecc36SMatthias Ringwald channel->reason = 0x0003; // security block 11671eb2563eS[email protected] channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 11681eb2563eS[email protected] } 1169df3354fcS[email protected] break; 1170df3354fcS[email protected] 1171df3354fcS[email protected] case L2CAP_STATE_WAIT_OUTGOING_SECURITY_LEVEL_UPDATE: 11725533f01eS[email protected] if (actual_level >= required_level){ 1173df3354fcS[email protected] channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_REQUEST; 1174df3354fcS[email protected] } else { 1175df3354fcS[email protected] // disconnnect, authentication not good enough 1176df3354fcS[email protected] hci_disconnect_security_block(handle); 1177df3354fcS[email protected] } 1178df3354fcS[email protected] break; 1179df3354fcS[email protected] 1180df3354fcS[email protected] default: 1181df3354fcS[email protected] break; 1182df3354fcS[email protected] } 1183f85a9399S[email protected] } 1184f85a9399S[email protected] break; 1185f85a9399S[email protected] 1186afde0c52Smatthias.ringwald default: 1187afde0c52Smatthias.ringwald break; 1188afde0c52Smatthias.ringwald } 1189afde0c52Smatthias.ringwald 1190bd63148eS[email protected] l2cap_run(); 11911e6aba47Smatthias.ringwald } 11921e6aba47Smatthias.ringwald 1193afde0c52Smatthias.ringwald static void l2cap_handle_disconnect_request(l2cap_channel_t *channel, uint16_t identifier){ 1194b1988dceSmatthias.ringwald channel->remote_sig_id = identifier; 1195e7ff783cSmatthias.ringwald channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1196e7ff783cSmatthias.ringwald l2cap_run(); 119784836b65Smatthias.ringwald } 119884836b65Smatthias.ringwald 11992b360848Smatthias.ringwald static void l2cap_register_signaling_response(hci_con_handle_t handle, uint8_t code, uint8_t sig_id, uint16_t data){ 12004cf56b4aSmatthias.ringwald // Vol 3, Part A, 4.3: "The DCID and SCID fields shall be ignored when the result field indi- cates the connection was refused." 12012b360848Smatthias.ringwald if (signaling_responses_pending < NR_PENDING_SIGNALING_RESPONSES) { 12022b360848Smatthias.ringwald signaling_responses[signaling_responses_pending].handle = handle; 12032b360848Smatthias.ringwald signaling_responses[signaling_responses_pending].code = code; 12042b360848Smatthias.ringwald signaling_responses[signaling_responses_pending].sig_id = sig_id; 12052b360848Smatthias.ringwald signaling_responses[signaling_responses_pending].data = data; 12062b360848Smatthias.ringwald signaling_responses_pending++; 12072b360848Smatthias.ringwald l2cap_run(); 12082b360848Smatthias.ringwald } 12092b360848Smatthias.ringwald } 12102b360848Smatthias.ringwald 1211b35f641cSmatthias.ringwald static void l2cap_handle_connection_request(hci_con_handle_t handle, uint8_t sig_id, uint16_t psm, uint16_t source_cid){ 1212645658c9Smatthias.ringwald 12139da54300S[email protected] // log_info("l2cap_handle_connection_request for handle %u, psm %u cid 0x%02x", handle, psm, source_cid); 1214645658c9Smatthias.ringwald l2cap_service_t *service = l2cap_get_service(psm); 1215645658c9Smatthias.ringwald if (!service) { 1216645658c9Smatthias.ringwald // 0x0002 PSM not supported 12172b360848Smatthias.ringwald l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0002); 1218645658c9Smatthias.ringwald return; 1219645658c9Smatthias.ringwald } 1220645658c9Smatthias.ringwald 12215061f3afS[email protected] hci_connection_t * hci_connection = hci_connection_for_handle( handle ); 1222645658c9Smatthias.ringwald if (!hci_connection) { 12232b360848Smatthias.ringwald // 12249da54300S[email protected] log_error("no hci_connection for handle %u", handle); 1225645658c9Smatthias.ringwald return; 1226645658c9Smatthias.ringwald } 12272bd8b7e7S[email protected] 1228645658c9Smatthias.ringwald // alloc structure 12299da54300S[email protected] // log_info("l2cap_handle_connection_request register channel"); 1230da144af5SMatthias Ringwald l2cap_channel_t * channel = l2cap_create_channel_entry(service->packet_handler, hci_connection->address, BD_ADDR_TYPE_CLASSIC, 1231da144af5SMatthias Ringwald psm, service->mtu, service->required_security_level); 12322b360848Smatthias.ringwald if (!channel){ 12332b360848Smatthias.ringwald // 0x0004 No resources available 12342b360848Smatthias.ringwald l2cap_register_signaling_response(handle, CONNECTION_REQUEST, sig_id, 0x0004); 12352b360848Smatthias.ringwald return; 12362b360848Smatthias.ringwald } 1237da144af5SMatthias Ringwald 1238fc64f94aSMatthias Ringwald channel->con_handle = handle; 1239b35f641cSmatthias.ringwald channel->remote_cid = source_cid; 1240b1988dceSmatthias.ringwald channel->remote_sig_id = sig_id; 1241645658c9Smatthias.ringwald 1242f53da564S[email protected] // limit local mtu to max acl packet length - l2cap header 12432985cb84Smatthias.ringwald if (channel->local_mtu > l2cap_max_mtu()) { 12442985cb84Smatthias.ringwald channel->local_mtu = l2cap_max_mtu(); 12459775e25bSmatthias.ringwald } 12469775e25bSmatthias.ringwald 1247645658c9Smatthias.ringwald // set initial state 1248df3354fcS[email protected] channel->state = L2CAP_STATE_WAIT_INCOMING_SECURITY_LEVEL_UPDATE; 1249ad671560S[email protected] channel->state_var = L2CAP_CHANNEL_STATE_VAR_SEND_CONN_RESP_PEND; 1250e405ae81Smatthias.ringwald 1251645658c9Smatthias.ringwald // add to connections list 1252665d90f2SMatthias Ringwald btstack_linked_list_add(&l2cap_channels, (btstack_linked_item_t *) channel); 1253645658c9Smatthias.ringwald 1254f85a9399S[email protected] // assert security requirements 12551eb2563eS[email protected] gap_request_security_level(handle, channel->required_security_level); 1256e405ae81Smatthias.ringwald } 1257645658c9Smatthias.ringwald 1258ce8f182eSMatthias Ringwald void l2cap_accept_connection(uint16_t local_cid){ 1259e0abb8e7S[email protected] log_info("L2CAP_ACCEPT_CONNECTION local_cid 0x%x", local_cid); 1260b35f641cSmatthias.ringwald l2cap_channel_t * channel = l2cap_get_channel_for_local_cid(local_cid); 1261e405ae81Smatthias.ringwald if (!channel) { 1262ce8f182eSMatthias Ringwald log_error("l2cap_accept_connection called but local_cid 0x%x not found", local_cid); 1263e405ae81Smatthias.ringwald return; 1264e405ae81Smatthias.ringwald } 1265e405ae81Smatthias.ringwald 1266552d92a1Smatthias.ringwald channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT; 1267e405ae81Smatthias.ringwald 1268552d92a1Smatthias.ringwald // process 1269552d92a1Smatthias.ringwald l2cap_run(); 1270e405ae81Smatthias.ringwald } 1271645658c9Smatthias.ringwald 12727ef6a7bbSMatthias Ringwald void l2cap_decline_connection(uint16_t local_cid){ 12737ef6a7bbSMatthias Ringwald log_info("L2CAP_DECLINE_CONNECTION local_cid 0x%x", local_cid); 1274b35f641cSmatthias.ringwald l2cap_channel_t * channel = l2cap_get_channel_for_local_cid( local_cid); 1275e405ae81Smatthias.ringwald if (!channel) { 1276ce8f182eSMatthias Ringwald log_error( "l2cap_decline_connection called but local_cid 0x%x not found", local_cid); 1277e405ae81Smatthias.ringwald return; 1278e405ae81Smatthias.ringwald } 1279e7ff783cSmatthias.ringwald channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE; 12807ef6a7bbSMatthias Ringwald channel->reason = 0x04; // no resources available 1281e7ff783cSmatthias.ringwald l2cap_run(); 1282645658c9Smatthias.ringwald } 1283645658c9Smatthias.ringwald 12847f02f414SMatthias Ringwald static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, uint8_t *command){ 1285b1988dceSmatthias.ringwald 1286b1988dceSmatthias.ringwald channel->remote_sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 1287b1988dceSmatthias.ringwald 1288f8fbdce0SMatthias Ringwald uint16_t flags = little_endian_read_16(command, 6); 128963a7246aSmatthias.ringwald if (flags & 1) { 129063a7246aSmatthias.ringwald channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT); 129163a7246aSmatthias.ringwald } 129263a7246aSmatthias.ringwald 12932784b77dSmatthias.ringwald // accept the other's configuration options 1294f8fbdce0SMatthias Ringwald uint16_t end_pos = 4 + little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 12953de7c0caSmatthias.ringwald uint16_t pos = 8; 12963de7c0caSmatthias.ringwald while (pos < end_pos){ 129763a7246aSmatthias.ringwald uint8_t option_hint = command[pos] >> 7; 129863a7246aSmatthias.ringwald uint8_t option_type = command[pos] & 0x7f; 129963a7246aSmatthias.ringwald log_info("l2cap cid %u, hint %u, type %u", channel->local_cid, option_hint, option_type); 130063a7246aSmatthias.ringwald pos++; 13011dc511deSmatthias.ringwald uint8_t length = command[pos++]; 13021dc511deSmatthias.ringwald // MTU { type(8): 1, len(8):2, MTU(16) } 130363a7246aSmatthias.ringwald if (option_type == 1 && length == 2){ 1304f8fbdce0SMatthias Ringwald channel->remote_mtu = little_endian_read_16(command, pos); 13059da54300S[email protected] // log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu); 130663a7246aSmatthias.ringwald channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU); 130763a7246aSmatthias.ringwald } 13080fe7a9d0S[email protected] // Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)} 13090fe7a9d0S[email protected] if (option_type == 2 && length == 2){ 1310f8fbdce0SMatthias Ringwald channel->flush_timeout = little_endian_read_16(command, pos); 13110fe7a9d0S[email protected] } 131263a7246aSmatthias.ringwald // check for unknown options 131363a7246aSmatthias.ringwald if (option_hint == 0 && (option_type == 0 || option_type >= 0x07)){ 1314c177a91cS[email protected] log_info("l2cap cid %u, unknown options", channel->local_cid); 131563a7246aSmatthias.ringwald channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_INVALID); 13161dc511deSmatthias.ringwald } 13171dc511deSmatthias.ringwald pos += length; 13181dc511deSmatthias.ringwald } 13192784b77dSmatthias.ringwald } 13202784b77dSmatthias.ringwald 1321fa8473a4Smatthias.ringwald static int l2cap_channel_ready_for_open(l2cap_channel_t *channel){ 13229da54300S[email protected] // log_info("l2cap_channel_ready_for_open 0x%02x", channel->state_var); 132373cf2b3dSmatthias.ringwald if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP) == 0) return 0; 132473cf2b3dSmatthias.ringwald if ((channel->state_var & L2CAP_CHANNEL_STATE_VAR_SENT_CONF_RSP) == 0) return 0; 1325019f9b43SMatthias Ringwald // addition check that fixes re-entrance issue causing l2cap event channel opened twice 1326019f9b43SMatthias Ringwald if (channel->state == L2CAP_STATE_OPEN) return 0; 1327fa8473a4Smatthias.ringwald return 1; 1328fa8473a4Smatthias.ringwald } 1329fa8473a4Smatthias.ringwald 1330fa8473a4Smatthias.ringwald 13317f02f414SMatthias Ringwald static void l2cap_signaling_handler_channel(l2cap_channel_t *channel, uint8_t *command){ 13321e6aba47Smatthias.ringwald 133300d93d79Smatthias.ringwald uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 133400d93d79Smatthias.ringwald uint8_t identifier = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 133538e5900eSmatthias.ringwald uint16_t result = 0; 13361e6aba47Smatthias.ringwald 13379da54300S[email protected] log_info("L2CAP signaling handler code %u, state %u", code, channel->state); 1338b35f641cSmatthias.ringwald 13399a011532Smatthias.ringwald // handle DISCONNECT REQUESTS seperately 13409a011532Smatthias.ringwald if (code == DISCONNECTION_REQUEST){ 13419a011532Smatthias.ringwald switch (channel->state){ 1342fa8473a4Smatthias.ringwald case L2CAP_STATE_CONFIG: 13439a011532Smatthias.ringwald case L2CAP_STATE_OPEN: 13442b83fb7dSmatthias.ringwald case L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST: 13459a011532Smatthias.ringwald case L2CAP_STATE_WAIT_DISCONNECT: 13469a011532Smatthias.ringwald l2cap_handle_disconnect_request(channel, identifier); 13479a011532Smatthias.ringwald break; 13489a011532Smatthias.ringwald 13499a011532Smatthias.ringwald default: 13509a011532Smatthias.ringwald // ignore in other states 13519a011532Smatthias.ringwald break; 13529a011532Smatthias.ringwald } 13539a011532Smatthias.ringwald return; 13549a011532Smatthias.ringwald } 13559a011532Smatthias.ringwald 135656081214Smatthias.ringwald // @STATEMACHINE(l2cap) 13571e6aba47Smatthias.ringwald switch (channel->state) { 13581e6aba47Smatthias.ringwald 13591e6aba47Smatthias.ringwald case L2CAP_STATE_WAIT_CONNECT_RSP: 13601e6aba47Smatthias.ringwald switch (code){ 13611e6aba47Smatthias.ringwald case CONNECTION_RESPONSE: 13625932bd7cS[email protected] l2cap_stop_rtx(channel); 1363f8fbdce0SMatthias Ringwald result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 136438e5900eSmatthias.ringwald switch (result) { 136538e5900eSmatthias.ringwald case 0: 1366169f8b28Smatthias.ringwald // successful connection 1367f8fbdce0SMatthias Ringwald channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1368fa8473a4Smatthias.ringwald channel->state = L2CAP_STATE_CONFIG; 136928ca2b46S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 137038e5900eSmatthias.ringwald break; 137138e5900eSmatthias.ringwald case 1: 13725932bd7cS[email protected] // connection pending. get some coffee, but start the ERTX 13735932bd7cS[email protected] l2cap_start_ertx(channel); 137438e5900eSmatthias.ringwald break; 137538e5900eSmatthias.ringwald default: 1376eb920dbeSmatthias.ringwald // channel closed 1377eb920dbeSmatthias.ringwald channel->state = L2CAP_STATE_CLOSED; 1378f32b992eSmatthias.ringwald // map l2cap connection response result to BTstack status enumeration 137938e5900eSmatthias.ringwald l2cap_emit_channel_opened(channel, L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result); 1380eb920dbeSmatthias.ringwald 1381eb920dbeSmatthias.ringwald // drop link key if security block 1382eb920dbeSmatthias.ringwald if (L2CAP_CONNECTION_RESPONSE_RESULT_SUCCESSFUL + result == L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_SECURITY){ 138315a95bd5SMatthias Ringwald gap_drop_link_key_for_bd_addr(channel->address); 1384eb920dbeSmatthias.ringwald } 1385eb920dbeSmatthias.ringwald 1386eb920dbeSmatthias.ringwald // discard channel 1387665d90f2SMatthias Ringwald btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1388d3a9df87Smatthias.ringwald btstack_memory_l2cap_channel_free(channel); 138938e5900eSmatthias.ringwald break; 13901e6aba47Smatthias.ringwald } 13911e6aba47Smatthias.ringwald break; 139238e5900eSmatthias.ringwald 139338e5900eSmatthias.ringwald default: 13941e6aba47Smatthias.ringwald //@TODO: implement other signaling packets 139538e5900eSmatthias.ringwald break; 13961e6aba47Smatthias.ringwald } 13971e6aba47Smatthias.ringwald break; 13981e6aba47Smatthias.ringwald 1399fa8473a4Smatthias.ringwald case L2CAP_STATE_CONFIG: 1400f8fbdce0SMatthias Ringwald result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+4); 1401ae280e73Smatthias.ringwald switch (code) { 1402ae280e73Smatthias.ringwald case CONFIGURE_REQUEST: 140328ca2b46S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP); 1404ae280e73Smatthias.ringwald l2cap_signaling_handle_configure_request(channel, command); 140563a7246aSmatthias.ringwald if (!(channel->state_var & L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_CONT)){ 140663a7246aSmatthias.ringwald // only done if continuation not set 140763a7246aSmatthias.ringwald channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_REQ); 140863a7246aSmatthias.ringwald } 1409ae280e73Smatthias.ringwald break; 14101e6aba47Smatthias.ringwald case CONFIGURE_RESPONSE: 14115932bd7cS[email protected] l2cap_stop_rtx(channel); 14125932bd7cS[email protected] switch (result){ 14135932bd7cS[email protected] case 0: // success 14145932bd7cS[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_RCVD_CONF_RSP); 14155932bd7cS[email protected] break; 14165932bd7cS[email protected] case 4: // pending 14175932bd7cS[email protected] l2cap_start_ertx(channel); 14185932bd7cS[email protected] break; 14195932bd7cS[email protected] default: 1420fe9d8984S[email protected] // retry on negative result 1421fe9d8984S[email protected] channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_REQ); 1422fe9d8984S[email protected] break; 1423fe9d8984S[email protected] } 14245a67bd4aSmatthias.ringwald break; 14255a67bd4aSmatthias.ringwald default: 14265a67bd4aSmatthias.ringwald break; 14271e6aba47Smatthias.ringwald } 1428fa8473a4Smatthias.ringwald if (l2cap_channel_ready_for_open(channel)){ 1429fa8473a4Smatthias.ringwald // for open: 14305a67bd4aSmatthias.ringwald channel->state = L2CAP_STATE_OPEN; 1431fa8473a4Smatthias.ringwald l2cap_emit_channel_opened(channel, 0); 1432c8e4258aSmatthias.ringwald } 1433c8e4258aSmatthias.ringwald break; 1434f62db1e3Smatthias.ringwald 1435f62db1e3Smatthias.ringwald case L2CAP_STATE_WAIT_DISCONNECT: 1436f62db1e3Smatthias.ringwald switch (code) { 1437f62db1e3Smatthias.ringwald case DISCONNECTION_RESPONSE: 143827a923d0Smatthias.ringwald l2cap_finialize_channel_close(channel); 143927a923d0Smatthias.ringwald break; 14405a67bd4aSmatthias.ringwald default: 14415a67bd4aSmatthias.ringwald //@TODO: implement other signaling packets 14425a67bd4aSmatthias.ringwald break; 144327a923d0Smatthias.ringwald } 144427a923d0Smatthias.ringwald break; 144584836b65Smatthias.ringwald 144684836b65Smatthias.ringwald case L2CAP_STATE_CLOSED: 144784836b65Smatthias.ringwald // @TODO handle incoming requests 144884836b65Smatthias.ringwald break; 144984836b65Smatthias.ringwald 145084836b65Smatthias.ringwald case L2CAP_STATE_OPEN: 145184836b65Smatthias.ringwald //@TODO: implement other signaling packets, e.g. re-configure 145284836b65Smatthias.ringwald break; 145310642e45Smatthias.ringwald default: 145410642e45Smatthias.ringwald break; 145527a923d0Smatthias.ringwald } 14569da54300S[email protected] // log_info("new state %u", channel->state); 145727a923d0Smatthias.ringwald } 145827a923d0Smatthias.ringwald 145900d93d79Smatthias.ringwald 14607f02f414SMatthias Ringwald static void l2cap_signaling_handler_dispatch( hci_con_handle_t handle, uint8_t * command){ 146100d93d79Smatthias.ringwald 146200d93d79Smatthias.ringwald // get code, signalind identifier and command len 146300d93d79Smatthias.ringwald uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 146400d93d79Smatthias.ringwald uint8_t sig_id = command[L2CAP_SIGNALING_COMMAND_SIGID_OFFSET]; 146500d93d79Smatthias.ringwald 146600d93d79Smatthias.ringwald // not for a particular channel, and not CONNECTION_REQUEST, ECHO_[REQUEST|RESPONSE], INFORMATION_REQUEST 146700d93d79Smatthias.ringwald if (code < 1 || code == ECHO_RESPONSE || code > INFORMATION_REQUEST){ 146863a7246aSmatthias.ringwald l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, L2CAP_REJ_CMD_UNKNOWN); 146900d93d79Smatthias.ringwald return; 147000d93d79Smatthias.ringwald } 147100d93d79Smatthias.ringwald 147200d93d79Smatthias.ringwald // general commands without an assigned channel 147300d93d79Smatthias.ringwald switch(code) { 147400d93d79Smatthias.ringwald 147500d93d79Smatthias.ringwald case CONNECTION_REQUEST: { 1476f8fbdce0SMatthias Ringwald uint16_t psm = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 1477f8fbdce0SMatthias Ringwald uint16_t source_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+2); 147800d93d79Smatthias.ringwald l2cap_handle_connection_request(handle, sig_id, psm, source_cid); 14792b83fb7dSmatthias.ringwald return; 148000d93d79Smatthias.ringwald } 148100d93d79Smatthias.ringwald 14822b360848Smatthias.ringwald case ECHO_REQUEST: 14832b360848Smatthias.ringwald l2cap_register_signaling_response(handle, code, sig_id, 0); 14842b83fb7dSmatthias.ringwald return; 148500d93d79Smatthias.ringwald 148600d93d79Smatthias.ringwald case INFORMATION_REQUEST: { 1487f8fbdce0SMatthias Ringwald uint16_t infoType = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 14882b360848Smatthias.ringwald l2cap_register_signaling_response(handle, code, sig_id, infoType); 14892b83fb7dSmatthias.ringwald return; 149000d93d79Smatthias.ringwald } 149100d93d79Smatthias.ringwald 149200d93d79Smatthias.ringwald default: 149300d93d79Smatthias.ringwald break; 149400d93d79Smatthias.ringwald } 149500d93d79Smatthias.ringwald 149600d93d79Smatthias.ringwald 149700d93d79Smatthias.ringwald // Get potential destination CID 1498f8fbdce0SMatthias Ringwald uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET); 149900d93d79Smatthias.ringwald 150000d93d79Smatthias.ringwald // Find channel for this sig_id and connection handle 1501665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 1502665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_channels); 1503665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1504665d90f2SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 1505fc64f94aSMatthias Ringwald if (channel->con_handle != handle) continue; 150600d93d79Smatthias.ringwald if (code & 1) { 1507b1988dceSmatthias.ringwald // match odd commands (responses) by previous signaling identifier 1508b1988dceSmatthias.ringwald if (channel->local_sig_id == sig_id) { 150900d93d79Smatthias.ringwald l2cap_signaling_handler_channel(channel, command); 15104e32727eSmatthias.ringwald break; 151100d93d79Smatthias.ringwald } 151200d93d79Smatthias.ringwald } else { 1513b1988dceSmatthias.ringwald // match even commands (requests) by local channel id 151400d93d79Smatthias.ringwald if (channel->local_cid == dest_cid) { 151500d93d79Smatthias.ringwald l2cap_signaling_handler_channel(channel, command); 15164e32727eSmatthias.ringwald break; 151700d93d79Smatthias.ringwald } 151800d93d79Smatthias.ringwald } 151900d93d79Smatthias.ringwald } 152000d93d79Smatthias.ringwald } 152100d93d79Smatthias.ringwald 1522e7d0c9aaSMatthias Ringwald #ifdef ENABLE_BLE 1523c48b2a2cSMatthias Ringwald // @returns valid 1524c48b2a2cSMatthias Ringwald static int l2cap_le_signaling_handler_dispatch(hci_con_handle_t handle, uint8_t * command, uint8_t sig_id){ 1525e7d0c9aaSMatthias Ringwald hci_connection_t * connection; 1526c48b2a2cSMatthias Ringwald uint16_t result; 1527c48b2a2cSMatthias Ringwald uint8_t event[10]; 1528828a7f7aSMatthias Ringwald uint16_t local_cid; 152983fd9c76SMatthias Ringwald l2cap_channel_t * channel; 153083fd9c76SMatthias Ringwald btstack_linked_list_iterator_t it; 153183fd9c76SMatthias Ringwald 1532cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 153383fd9c76SMatthias Ringwald uint16_t le_psm; 153463f0ac45SMatthias Ringwald uint16_t new_credits; 153563f0ac45SMatthias Ringwald uint16_t credits_before; 1536e7d0c9aaSMatthias Ringwald l2cap_service_t * service; 153783fd9c76SMatthias Ringwald #endif 153800d93d79Smatthias.ringwald 15391b8b8d05SMatthias Ringwald uint8_t code = command[L2CAP_SIGNALING_COMMAND_CODE_OFFSET]; 154023017473SMatthias Ringwald log_info("l2cap_le_signaling_handler_dispatch: command 0x%02x, sig id %u", code, sig_id); 15411b8b8d05SMatthias Ringwald 15421b8b8d05SMatthias Ringwald switch (code){ 154300d93d79Smatthias.ringwald 1544c48b2a2cSMatthias Ringwald case CONNECTION_PARAMETER_UPDATE_RESPONSE: 1545c48b2a2cSMatthias Ringwald result = little_endian_read_16(command, 4); 1546ccf076adS[email protected] l2cap_emit_connection_parameter_update_response(handle, result); 1547ccf076adS[email protected] break; 1548da886c03S[email protected] 1549c48b2a2cSMatthias Ringwald case CONNECTION_PARAMETER_UPDATE_REQUEST: 1550e7d0c9aaSMatthias Ringwald connection = hci_connection_for_handle(handle); 1551da886c03S[email protected] if (connection){ 15526d91fb6cSMatthias Ringwald if (connection->role != HCI_ROLE_MASTER){ 15536d91fb6cSMatthias Ringwald // reject command without notifying upper layer when not in master role 1554c48b2a2cSMatthias Ringwald return 0; 15556d91fb6cSMatthias Ringwald } 1556da886c03S[email protected] int update_parameter = 1; 1557a4c06b28SMatthias Ringwald le_connection_parameter_range_t existing_range; 15584ced4e8cSMatthias Ringwald gap_get_connection_parameter_range(&existing_range); 1559c48b2a2cSMatthias Ringwald uint16_t le_conn_interval_min = little_endian_read_16(command,8); 1560c48b2a2cSMatthias Ringwald uint16_t le_conn_interval_max = little_endian_read_16(command,10); 1561c48b2a2cSMatthias Ringwald uint16_t le_conn_latency = little_endian_read_16(command,12); 1562c48b2a2cSMatthias Ringwald uint16_t le_supervision_timeout = little_endian_read_16(command,14); 1563da886c03S[email protected] 1564da886c03S[email protected] if (le_conn_interval_min < existing_range.le_conn_interval_min) update_parameter = 0; 1565da886c03S[email protected] if (le_conn_interval_max > existing_range.le_conn_interval_max) update_parameter = 0; 1566da886c03S[email protected] 1567da886c03S[email protected] if (le_conn_latency < existing_range.le_conn_latency_min) update_parameter = 0; 1568da886c03S[email protected] if (le_conn_latency > existing_range.le_conn_latency_max) update_parameter = 0; 1569da886c03S[email protected] 1570da886c03S[email protected] if (le_supervision_timeout < existing_range.le_supervision_timeout_min) update_parameter = 0; 1571da886c03S[email protected] if (le_supervision_timeout > existing_range.le_supervision_timeout_max) update_parameter = 0; 1572da886c03S[email protected] 1573da886c03S[email protected] if (update_parameter){ 1574da886c03S[email protected] connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_SEND_RESPONSE; 1575da886c03S[email protected] connection->le_conn_interval_min = le_conn_interval_min; 1576da886c03S[email protected] connection->le_conn_interval_max = le_conn_interval_max; 1577da886c03S[email protected] connection->le_conn_latency = le_conn_latency; 1578da886c03S[email protected] connection->le_supervision_timeout = le_supervision_timeout; 1579da886c03S[email protected] } else { 1580da886c03S[email protected] connection->le_con_parameter_update_state = CON_PARAMETER_UPDATE_DENY; 1581da886c03S[email protected] } 1582c48b2a2cSMatthias Ringwald connection->le_con_param_update_identifier = sig_id; 1583da886c03S[email protected] } 1584da886c03S[email protected] 158533c40538SMatthias Ringwald if (!l2cap_event_packet_handler) break; 1586c48b2a2cSMatthias Ringwald 1587c48b2a2cSMatthias Ringwald event[0] = L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST; 1588c48b2a2cSMatthias Ringwald event[1] = 8; 1589c48b2a2cSMatthias Ringwald memcpy(&event[2], &command[4], 8); 1590c48b2a2cSMatthias Ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 159133c40538SMatthias Ringwald (*l2cap_event_packet_handler)( HCI_EVENT_PACKET, 0, event, sizeof(event)); 1592ccf076adS[email protected] break; 1593c48b2a2cSMatthias Ringwald 159463f0ac45SMatthias Ringwald case COMMAND_REJECT: 159563f0ac45SMatthias Ringwald // Find channel for this sig_id and connection handle 159663f0ac45SMatthias Ringwald channel = NULL; 159763f0ac45SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 159863f0ac45SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 159963f0ac45SMatthias Ringwald l2cap_channel_t * a_channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 160063f0ac45SMatthias Ringwald if (a_channel->con_handle != handle) continue; 160163f0ac45SMatthias Ringwald if (a_channel->local_sig_id != sig_id) continue; 160263f0ac45SMatthias Ringwald channel = a_channel; 160363f0ac45SMatthias Ringwald break; 160463f0ac45SMatthias Ringwald } 160563f0ac45SMatthias Ringwald if (!channel) break; 160663f0ac45SMatthias Ringwald 160763f0ac45SMatthias Ringwald // if received while waiting for le connection response, assume legacy device 160863f0ac45SMatthias Ringwald if (channel->state == L2CAP_STATE_WAIT_LE_CONNECTION_RESPONSE){ 160963f0ac45SMatthias Ringwald channel->state = L2CAP_STATE_CLOSED; 161063f0ac45SMatthias Ringwald // no official value for this, use: Connection refused – LE_PSM not supported - 0x0002 161144276248SMatthias Ringwald l2cap_emit_le_channel_opened(channel, 0x0002); 161263f0ac45SMatthias Ringwald 161363f0ac45SMatthias Ringwald // discard channel 161463f0ac45SMatthias Ringwald btstack_linked_list_remove(&l2cap_le_channels, (btstack_linked_item_t *) channel); 161563f0ac45SMatthias Ringwald btstack_memory_l2cap_channel_free(channel); 161663f0ac45SMatthias Ringwald break; 161763f0ac45SMatthias Ringwald } 161863f0ac45SMatthias Ringwald break; 161963f0ac45SMatthias Ringwald 1620cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 1621e7d0c9aaSMatthias Ringwald case LE_CREDIT_BASED_CONNECTION_REQUEST: 1622e7d0c9aaSMatthias Ringwald 1623e7d0c9aaSMatthias Ringwald // get hci connection, bail if not found (must not happen) 1624e7d0c9aaSMatthias Ringwald connection = hci_connection_for_handle(handle); 1625e7d0c9aaSMatthias Ringwald if (!connection) return 0; 1626e7d0c9aaSMatthias Ringwald 1627e7d0c9aaSMatthias Ringwald // check if service registered 1628e7d0c9aaSMatthias Ringwald le_psm = little_endian_read_16(command, 4); 1629e7d0c9aaSMatthias Ringwald service = l2cap_le_get_service(le_psm); 1630e7d0c9aaSMatthias Ringwald 1631e7d0c9aaSMatthias Ringwald if (service){ 1632e7d0c9aaSMatthias Ringwald 1633e7d0c9aaSMatthias Ringwald uint16_t source_cid = little_endian_read_16(command, 6); 1634e7d0c9aaSMatthias Ringwald if (source_cid < 0x40){ 1635e7d0c9aaSMatthias Ringwald // 0x0009 Connection refused - Invalid Source CID 1636e7d0c9aaSMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0009); 1637e7d0c9aaSMatthias Ringwald return 1; 1638e7d0c9aaSMatthias Ringwald } 1639e7d0c9aaSMatthias Ringwald 1640e7d0c9aaSMatthias Ringwald // go through list of channels for this ACL connection and check if we get a match 1641e7d0c9aaSMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 1642e7d0c9aaSMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 16431b8b8d05SMatthias Ringwald l2cap_channel_t * a_channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 16441b8b8d05SMatthias Ringwald if (a_channel->con_handle != handle) continue; 16451b8b8d05SMatthias Ringwald if (a_channel->remote_cid != source_cid) continue; 1646e7d0c9aaSMatthias Ringwald // 0x000a Connection refused - Source CID already allocated 1647e7d0c9aaSMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x000a); 1648e7d0c9aaSMatthias Ringwald return 1; 1649e7d0c9aaSMatthias Ringwald } 1650e7d0c9aaSMatthias Ringwald 165183fd9c76SMatthias Ringwald // security: check encryption 165283fd9c76SMatthias Ringwald if (service->required_security_level >= LEVEL_2){ 165383fd9c76SMatthias Ringwald if (sm_encryption_key_size(handle) == 0){ 165483fd9c76SMatthias Ringwald // 0x0008 Connection refused - insufficient encryption 165583fd9c76SMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0008); 165683fd9c76SMatthias Ringwald return 1; 165783fd9c76SMatthias Ringwald } 165883fd9c76SMatthias Ringwald // anything less than 16 byte key size is insufficient 165983fd9c76SMatthias Ringwald if (sm_encryption_key_size(handle) < 16){ 166083fd9c76SMatthias Ringwald // 0x0007 Connection refused – insufficient encryption key size 166183fd9c76SMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0007); 166283fd9c76SMatthias Ringwald return 1; 166383fd9c76SMatthias Ringwald } 166483fd9c76SMatthias Ringwald } 166583fd9c76SMatthias Ringwald 166683fd9c76SMatthias Ringwald // security: check authencation 166783fd9c76SMatthias Ringwald if (service->required_security_level >= LEVEL_3){ 166883fd9c76SMatthias Ringwald if (!sm_authenticated(handle)){ 166983fd9c76SMatthias Ringwald // 0x0005 Connection refused – insufficient authentication 167083fd9c76SMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0005); 167183fd9c76SMatthias Ringwald return 1; 167283fd9c76SMatthias Ringwald } 167383fd9c76SMatthias Ringwald } 167483fd9c76SMatthias Ringwald 167583fd9c76SMatthias Ringwald // security: check authorization 167683fd9c76SMatthias Ringwald if (service->required_security_level >= LEVEL_4){ 167783fd9c76SMatthias Ringwald if (sm_authorization_state(handle) != AUTHORIZATION_GRANTED){ 167883fd9c76SMatthias Ringwald // 0x0006 Connection refused – insufficient authorization 167983fd9c76SMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0006); 168083fd9c76SMatthias Ringwald return 1; 168183fd9c76SMatthias Ringwald } 168283fd9c76SMatthias Ringwald } 1683e7d0c9aaSMatthias Ringwald 1684e7d0c9aaSMatthias Ringwald // allocate channel 16851b8b8d05SMatthias Ringwald channel = l2cap_create_channel_entry(service->packet_handler, connection->address, 1686e7d0c9aaSMatthias Ringwald BD_ADDR_TYPE_LE_RANDOM, le_psm, service->mtu, service->required_security_level); 1687e7d0c9aaSMatthias Ringwald if (!channel){ 1688e7d0c9aaSMatthias Ringwald // 0x0004 Connection refused – no resources available 1689e7d0c9aaSMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0004); 1690e7d0c9aaSMatthias Ringwald return 1; 1691e7d0c9aaSMatthias Ringwald } 1692e7d0c9aaSMatthias Ringwald 1693e7d0c9aaSMatthias Ringwald channel->con_handle = handle; 1694e7d0c9aaSMatthias Ringwald channel->remote_cid = source_cid; 1695e7d0c9aaSMatthias Ringwald channel->remote_sig_id = sig_id; 16967f107edaSMatthias Ringwald channel->remote_mtu = little_endian_read_16(command, 8); 16977f107edaSMatthias Ringwald channel->remote_mps = little_endian_read_16(command, 10); 16987f107edaSMatthias Ringwald channel->credits_outgoing = little_endian_read_16(command, 12); 1699e7d0c9aaSMatthias Ringwald 1700e7d0c9aaSMatthias Ringwald // set initial state 1701e7d0c9aaSMatthias Ringwald channel->state = L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT; 1702*c99bb618SMatthias Ringwald channel->state_var |= L2CAP_CHANNEL_STATE_VAR_INCOMING; 1703e7d0c9aaSMatthias Ringwald 1704e7d0c9aaSMatthias Ringwald // add to connections list 1705e7d0c9aaSMatthias Ringwald btstack_linked_list_add(&l2cap_le_channels, (btstack_linked_item_t *) channel); 1706e7d0c9aaSMatthias Ringwald 1707e7d0c9aaSMatthias Ringwald // post connection request event 170844276248SMatthias Ringwald l2cap_emit_le_incoming_connection(channel); 1709e7d0c9aaSMatthias Ringwald 1710e7d0c9aaSMatthias Ringwald } else { 1711e7d0c9aaSMatthias Ringwald // Connection refused – LE_PSM not supported 1712e7d0c9aaSMatthias Ringwald l2cap_register_signaling_response(handle, LE_CREDIT_BASED_CONNECTION_REQUEST, sig_id, 0x0002); 1713e7d0c9aaSMatthias Ringwald } 1714e7d0c9aaSMatthias Ringwald break; 17151b8b8d05SMatthias Ringwald 17161b8b8d05SMatthias Ringwald case LE_CREDIT_BASED_CONNECTION_RESPONSE: 17171b8b8d05SMatthias Ringwald // Find channel for this sig_id and connection handle 17181b8b8d05SMatthias Ringwald channel = NULL; 17191b8b8d05SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 17201b8b8d05SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 17211b8b8d05SMatthias Ringwald l2cap_channel_t * a_channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 17221b8b8d05SMatthias Ringwald if (a_channel->con_handle != handle) continue; 17231b8b8d05SMatthias Ringwald if (a_channel->local_sig_id != sig_id) continue; 17241b8b8d05SMatthias Ringwald channel = a_channel; 17251b8b8d05SMatthias Ringwald break; 17261b8b8d05SMatthias Ringwald } 17271b8b8d05SMatthias Ringwald if (!channel) break; 17281b8b8d05SMatthias Ringwald 17291b8b8d05SMatthias Ringwald // cid + 0 17301b8b8d05SMatthias Ringwald result = little_endian_read_16 (command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET+8); 17311b8b8d05SMatthias Ringwald if (result){ 17321b8b8d05SMatthias Ringwald channel->state = L2CAP_STATE_CLOSED; 17331b8b8d05SMatthias Ringwald // map l2cap connection response result to BTstack status enumeration 173444276248SMatthias Ringwald l2cap_emit_le_channel_opened(channel, result); 17351b8b8d05SMatthias Ringwald 17361b8b8d05SMatthias Ringwald // discard channel 173763f0ac45SMatthias Ringwald btstack_linked_list_remove(&l2cap_le_channels, (btstack_linked_item_t *) channel); 17381b8b8d05SMatthias Ringwald btstack_memory_l2cap_channel_free(channel); 17391b8b8d05SMatthias Ringwald break; 17401b8b8d05SMatthias Ringwald } 17411b8b8d05SMatthias Ringwald 17421b8b8d05SMatthias Ringwald // success 17431b8b8d05SMatthias Ringwald channel->remote_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 0); 17441b8b8d05SMatthias Ringwald channel->remote_mtu = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 2); 17451b8b8d05SMatthias Ringwald channel->remote_mps = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 4); 17461b8b8d05SMatthias Ringwald channel->credits_outgoing = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 6); 17471b8b8d05SMatthias Ringwald channel->state = L2CAP_STATE_OPEN; 174844276248SMatthias Ringwald l2cap_emit_le_channel_opened(channel, result); 17491b8b8d05SMatthias Ringwald break; 17501b8b8d05SMatthias Ringwald 175185aeef60SMatthias Ringwald case LE_FLOW_CONTROL_CREDIT: 175285aeef60SMatthias Ringwald // find channel 175385aeef60SMatthias Ringwald local_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 0); 175485aeef60SMatthias Ringwald channel = l2cap_le_get_channel_for_local_cid(local_cid); 175563f0ac45SMatthias Ringwald if (!channel) { 175663f0ac45SMatthias Ringwald log_error("l2cap: no channel for cid 0x%02x", local_cid); 175763f0ac45SMatthias Ringwald break; 175863f0ac45SMatthias Ringwald } 175963f0ac45SMatthias Ringwald new_credits = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 2); 176063f0ac45SMatthias Ringwald credits_before = channel->credits_outgoing; 176163f0ac45SMatthias Ringwald channel->credits_outgoing += new_credits; 176263f0ac45SMatthias Ringwald // check for credit overrun 176363f0ac45SMatthias Ringwald if (credits_before > channel->credits_outgoing){ 176463f0ac45SMatthias Ringwald log_error("l2cap: new credits caused overrrun for cid 0x%02x, disconnecting", local_cid); 176563f0ac45SMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 176663f0ac45SMatthias Ringwald break; 176763f0ac45SMatthias Ringwald } 176863f0ac45SMatthias Ringwald log_info("l2cap: %u credits for 0x%02x, now %u", new_credits, local_cid, channel->credits_outgoing); 176985aeef60SMatthias Ringwald break; 177083fd9c76SMatthias Ringwald #endif 177185aeef60SMatthias Ringwald 1772828a7f7aSMatthias Ringwald case DISCONNECTION_REQUEST: 1773828a7f7aSMatthias Ringwald // find channel 1774828a7f7aSMatthias Ringwald local_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET + 0); 1775828a7f7aSMatthias Ringwald channel = l2cap_le_get_channel_for_local_cid(local_cid); 177663f34e00SMatthias Ringwald if (!channel) { 177763f34e00SMatthias Ringwald log_error("l2cap: no channel for cid 0x%02x", local_cid); 177863f34e00SMatthias Ringwald break; 177963f34e00SMatthias Ringwald } 1780828a7f7aSMatthias Ringwald channel->remote_sig_id = sig_id; 1781828a7f7aSMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_RESPONSE; 1782828a7f7aSMatthias Ringwald break; 1783828a7f7aSMatthias Ringwald 178463f0ac45SMatthias Ringwald case DISCONNECTION_RESPONSE: 178563f0ac45SMatthias Ringwald break; 178663f0ac45SMatthias Ringwald 1787c48b2a2cSMatthias Ringwald default: 1788c48b2a2cSMatthias Ringwald // command unknown -> reject command 1789c48b2a2cSMatthias Ringwald return 0; 1790ccf076adS[email protected] } 1791c48b2a2cSMatthias Ringwald return 1; 1792c48b2a2cSMatthias Ringwald } 1793e7d0c9aaSMatthias Ringwald #endif 1794c48b2a2cSMatthias Ringwald 1795c48b2a2cSMatthias Ringwald static void l2cap_acl_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size ){ 1796c48b2a2cSMatthias Ringwald 1797c48b2a2cSMatthias Ringwald // Get Channel ID 1798c48b2a2cSMatthias Ringwald uint16_t channel_id = READ_L2CAP_CHANNEL_ID(packet); 1799c48b2a2cSMatthias Ringwald hci_con_handle_t handle = READ_ACL_CONNECTION_HANDLE(packet); 1800c48b2a2cSMatthias Ringwald 1801c48b2a2cSMatthias Ringwald switch (channel_id) { 1802c48b2a2cSMatthias Ringwald 1803c48b2a2cSMatthias Ringwald case L2CAP_CID_SIGNALING: { 1804c48b2a2cSMatthias Ringwald uint16_t command_offset = 8; 1805c48b2a2cSMatthias Ringwald while (command_offset < size) { 1806c48b2a2cSMatthias Ringwald // handle signaling commands 1807c48b2a2cSMatthias Ringwald l2cap_signaling_handler_dispatch(handle, &packet[command_offset]); 1808c48b2a2cSMatthias Ringwald 1809c48b2a2cSMatthias Ringwald // increment command_offset 1810c48b2a2cSMatthias Ringwald command_offset += L2CAP_SIGNALING_COMMAND_DATA_OFFSET + little_endian_read_16(packet, command_offset + L2CAP_SIGNALING_COMMAND_LENGTH_OFFSET); 1811c48b2a2cSMatthias Ringwald } 1812c48b2a2cSMatthias Ringwald break; 1813c48b2a2cSMatthias Ringwald } 1814c48b2a2cSMatthias Ringwald 1815e7d0c9aaSMatthias Ringwald #ifdef ENABLE_BLE 1816e7d0c9aaSMatthias Ringwald case L2CAP_CID_SIGNALING_LE: { 1817e7d0c9aaSMatthias Ringwald uint16_t sig_id = packet[COMPLETE_L2CAP_HEADER + 1]; 1818e7d0c9aaSMatthias Ringwald int valid = l2cap_le_signaling_handler_dispatch(handle, &packet[COMPLETE_L2CAP_HEADER], sig_id); 1819c48b2a2cSMatthias Ringwald if (!valid){ 18201bbc0b23S[email protected] l2cap_register_signaling_response(handle, COMMAND_REJECT_LE, sig_id, L2CAP_REJ_CMD_UNKNOWN); 1821ccf076adS[email protected] } 1822ccf076adS[email protected] break; 1823e7d0c9aaSMatthias Ringwald } 1824e7d0c9aaSMatthias Ringwald #endif 1825c48b2a2cSMatthias Ringwald 1826c48b2a2cSMatthias Ringwald case L2CAP_CID_ATTRIBUTE_PROTOCOL: 1827c48b2a2cSMatthias Ringwald if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback) { 1828c48b2a2cSMatthias Ringwald (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_ATTRIBUTE_PROTOCOL].callback)(ATT_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1829ccf076adS[email protected] } 1830c48b2a2cSMatthias Ringwald break; 1831c48b2a2cSMatthias Ringwald 1832c48b2a2cSMatthias Ringwald case L2CAP_CID_SECURITY_MANAGER_PROTOCOL: 1833c48b2a2cSMatthias Ringwald if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback) { 1834c48b2a2cSMatthias Ringwald (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_SECURITY_MANAGER_PROTOCOL].callback)(SM_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1835c48b2a2cSMatthias Ringwald } 1836c48b2a2cSMatthias Ringwald break; 1837c48b2a2cSMatthias Ringwald 1838c48b2a2cSMatthias Ringwald case L2CAP_CID_CONNECTIONLESS_CHANNEL: 1839c48b2a2cSMatthias Ringwald if (fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback) { 1840c48b2a2cSMatthias Ringwald (*fixed_channels[L2CAP_FIXED_CHANNEL_TABLE_INDEX_CONNECTIONLESS_CHANNEL].callback)(UCD_DATA_PACKET, handle, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 1841c48b2a2cSMatthias Ringwald } 1842c48b2a2cSMatthias Ringwald break; 18431bbc0b23S[email protected] 18445652b5ffS[email protected] default: { 184500d93d79Smatthias.ringwald // Find channel for this channel_id and connection handle 184664e11ca9SMatthias Ringwald l2cap_channel_t * l2cap_channel; 184764e11ca9SMatthias Ringwald l2cap_channel = l2cap_get_channel_for_local_cid(channel_id); 1848d1fd2a88SMatthias Ringwald if (l2cap_channel) { 18493d50b4baSMatthias Ringwald l2cap_dispatch_to_channel(l2cap_channel, L2CAP_DATA_PACKET, &packet[COMPLETE_L2CAP_HEADER], size-COMPLETE_L2CAP_HEADER); 185000d93d79Smatthias.ringwald } 185164e11ca9SMatthias Ringwald #ifdef ENABLE_BLE 185264e11ca9SMatthias Ringwald l2cap_channel = l2cap_le_get_channel_for_local_cid(channel_id); 185364e11ca9SMatthias Ringwald if (l2cap_channel) { 185485aeef60SMatthias Ringwald // credit counting 185585aeef60SMatthias Ringwald if (l2cap_channel->credits_incoming == 0){ 185685aeef60SMatthias Ringwald log_error("LE Data Channel packet received but no incoming credits"); 185785aeef60SMatthias Ringwald l2cap_channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 185885aeef60SMatthias Ringwald break; 185985aeef60SMatthias Ringwald } 186085aeef60SMatthias Ringwald l2cap_channel->credits_incoming--; 186185aeef60SMatthias Ringwald 186285aeef60SMatthias Ringwald // automatic credits 186385aeef60SMatthias Ringwald if (l2cap_channel->credits_incoming < L2CAP_LE_DATA_CHANNELS_AUTOMATIC_CREDITS_WATERMARK && l2cap_channel->automatic_credits){ 186485aeef60SMatthias Ringwald l2cap_channel->new_credits_incoming = L2CAP_LE_DATA_CHANNELS_AUTOMATIC_CREDITS_INCREMENT; 186585aeef60SMatthias Ringwald } 186685aeef60SMatthias Ringwald 1867cd529728SMatthias Ringwald // first fragment 1868cd529728SMatthias Ringwald uint16_t pos = 0; 1869cd529728SMatthias Ringwald if (!l2cap_channel->receive_sdu_len){ 1870cd529728SMatthias Ringwald l2cap_channel->receive_sdu_len = little_endian_read_16(packet, COMPLETE_L2CAP_HEADER); 1871cd529728SMatthias Ringwald l2cap_channel->receive_sdu_pos = 0; 1872cd529728SMatthias Ringwald pos += 2; 1873cd529728SMatthias Ringwald size -= 2; 1874cd529728SMatthias Ringwald } 1875cd529728SMatthias Ringwald memcpy(&l2cap_channel->receive_sdu_buffer[l2cap_channel->receive_sdu_pos], &packet[COMPLETE_L2CAP_HEADER+pos], size-COMPLETE_L2CAP_HEADER); 1876cd529728SMatthias Ringwald l2cap_channel->receive_sdu_pos += size - COMPLETE_L2CAP_HEADER; 1877cd529728SMatthias Ringwald // done? 187863f0ac45SMatthias Ringwald log_info("le packet pos %u, len %u", l2cap_channel->receive_sdu_pos, l2cap_channel->receive_sdu_len); 1879cd529728SMatthias Ringwald if (l2cap_channel->receive_sdu_pos >= l2cap_channel->receive_sdu_len){ 1880cd529728SMatthias Ringwald l2cap_dispatch_to_channel(l2cap_channel, L2CAP_DATA_PACKET, l2cap_channel->receive_sdu_buffer, l2cap_channel->receive_sdu_len); 1881cd529728SMatthias Ringwald l2cap_channel->receive_sdu_len = 0; 1882cd529728SMatthias Ringwald } 188363f0ac45SMatthias Ringwald } else { 188463f0ac45SMatthias Ringwald log_error("LE Data Channel packet received but no channel found for cid 0x%02x", channel_id); 188564e11ca9SMatthias Ringwald } 188664e11ca9SMatthias Ringwald #endif 18875652b5ffS[email protected] break; 18885652b5ffS[email protected] } 18895652b5ffS[email protected] } 189000d93d79Smatthias.ringwald 18911eb2563eS[email protected] l2cap_run(); 18922718e2e7Smatthias.ringwald } 189300d93d79Smatthias.ringwald 189415ec09bbSmatthias.ringwald // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 189527a923d0Smatthias.ringwald void l2cap_finialize_channel_close(l2cap_channel_t * channel){ 1896f62db1e3Smatthias.ringwald channel->state = L2CAP_STATE_CLOSED; 1897f62db1e3Smatthias.ringwald l2cap_emit_channel_closed(channel); 1898f62db1e3Smatthias.ringwald // discard channel 18999dcb2fb2S[email protected] l2cap_stop_rtx(channel); 1900665d90f2SMatthias Ringwald btstack_linked_list_remove(&l2cap_channels, (btstack_linked_item_t *) channel); 1901d3a9df87Smatthias.ringwald btstack_memory_l2cap_channel_free(channel); 1902c8e4258aSmatthias.ringwald } 19031e6aba47Smatthias.ringwald 19048f2a52f4SMatthias Ringwald static l2cap_service_t * l2cap_get_service_internal(btstack_linked_list_t * services, uint16_t psm){ 1905665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 1906665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, services); 1907665d90f2SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 1908665d90f2SMatthias Ringwald l2cap_service_t * service = (l2cap_service_t *) btstack_linked_list_iterator_next(&it); 19099d9bbc01Smatthias.ringwald if ( service->psm == psm){ 19109d9bbc01Smatthias.ringwald return service; 19119d9bbc01Smatthias.ringwald }; 19129d9bbc01Smatthias.ringwald } 19139d9bbc01Smatthias.ringwald return NULL; 19149d9bbc01Smatthias.ringwald } 19159d9bbc01Smatthias.ringwald 19167192e786SMatthias Ringwald static inline l2cap_service_t * l2cap_get_service(uint16_t psm){ 19177192e786SMatthias Ringwald return l2cap_get_service_internal(&l2cap_services, psm); 19187192e786SMatthias Ringwald } 19197192e786SMatthias Ringwald 1920e0abb8e7S[email protected] 1921be2053a6SMatthias Ringwald uint8_t l2cap_register_service(btstack_packet_handler_t service_packet_handler, uint16_t psm, uint16_t mtu, gap_security_level_t security_level){ 1922be2053a6SMatthias Ringwald 1923be2053a6SMatthias Ringwald log_info("L2CAP_REGISTER_SERVICE psm 0x%x mtu %u", psm, mtu); 1924e0abb8e7S[email protected] 19254bb582b6Smatthias.ringwald // check for alread registered psm 19269d9bbc01Smatthias.ringwald l2cap_service_t *service = l2cap_get_service(psm); 1927277abc2cSmatthias.ringwald if (service) { 1928be2053a6SMatthias Ringwald log_error("l2cap_register_service: PSM %u already registered", psm); 1929be2053a6SMatthias Ringwald return L2CAP_SERVICE_ALREADY_REGISTERED; 1930277abc2cSmatthias.ringwald } 19319d9bbc01Smatthias.ringwald 19324bb582b6Smatthias.ringwald // alloc structure 1933bb69aaaeS[email protected] service = btstack_memory_l2cap_service_get(); 1934277abc2cSmatthias.ringwald if (!service) { 1935be2053a6SMatthias Ringwald log_error("l2cap_register_service: no memory for l2cap_service_t"); 1936be2053a6SMatthias Ringwald return BTSTACK_MEMORY_ALLOC_FAILED; 1937277abc2cSmatthias.ringwald } 19389d9bbc01Smatthias.ringwald 19399d9bbc01Smatthias.ringwald // fill in 19409d9bbc01Smatthias.ringwald service->psm = psm; 19419d9bbc01Smatthias.ringwald service->mtu = mtu; 194205ae8de3SMatthias Ringwald service->packet_handler = service_packet_handler; 1943df3354fcS[email protected] service->required_security_level = security_level; 19449d9bbc01Smatthias.ringwald 19459d9bbc01Smatthias.ringwald // add to services list 1946665d90f2SMatthias Ringwald btstack_linked_list_add(&l2cap_services, (btstack_linked_item_t *) service); 1947c0e866bfSmatthias.ringwald 1948c0e866bfSmatthias.ringwald // enable page scan 194915a95bd5SMatthias Ringwald gap_connectable_control(1); 19505842b6d9Smatthias.ringwald 1951be2053a6SMatthias Ringwald return 0; 19529d9bbc01Smatthias.ringwald } 19539d9bbc01Smatthias.ringwald 19547e8856ebSMatthias Ringwald uint8_t l2cap_unregister_service(uint16_t psm){ 1955e0abb8e7S[email protected] 1956e0abb8e7S[email protected] log_info("L2CAP_UNREGISTER_SERVICE psm 0x%x", psm); 1957e0abb8e7S[email protected] 19589d9bbc01Smatthias.ringwald l2cap_service_t *service = l2cap_get_service(psm); 19597e8856ebSMatthias Ringwald if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 1960665d90f2SMatthias Ringwald btstack_linked_list_remove(&l2cap_services, (btstack_linked_item_t *) service); 1961d3a9df87Smatthias.ringwald btstack_memory_l2cap_service_free(service); 1962c0e866bfSmatthias.ringwald 1963c0e866bfSmatthias.ringwald // disable page scan when no services registered 19647e8856ebSMatthias Ringwald if (btstack_linked_list_empty(&l2cap_services)) { 196515a95bd5SMatthias Ringwald gap_connectable_control(0); 19669d9bbc01Smatthias.ringwald } 19677e8856ebSMatthias Ringwald return 0; 19687e8856ebSMatthias Ringwald } 19699d9bbc01Smatthias.ringwald 19705652b5ffS[email protected] // Bluetooth 4.0 - allows to register handler for Attribute Protocol and Security Manager Protocol 197105ae8de3SMatthias Ringwald void l2cap_register_fixed_channel(btstack_packet_handler_t the_packet_handler, uint16_t channel_id) { 19725628cf69SMatthias Ringwald int index = l2cap_fixed_channel_table_index_for_channel_id(channel_id); 19735628cf69SMatthias Ringwald if (index < 0) return; 19745628cf69SMatthias Ringwald fixed_channels[index].callback = the_packet_handler; 19755652b5ffS[email protected] } 19765652b5ffS[email protected] 1977a9a4c409SMatthias Ringwald #ifdef ENABLE_BLE 19787192e786SMatthias Ringwald 1979cab29d48SMatthias Ringwald #ifdef ENABLE_LE_DATA_CHANNELS 198083fd9c76SMatthias Ringwald 198157be49d6SMatthias Ringwald static void l2cap_le_notify_channel_can_send(l2cap_channel_t *channel){ 198257be49d6SMatthias Ringwald if (!channel->waiting_for_can_send_now) return; 198357be49d6SMatthias Ringwald if (channel->send_sdu_buffer) return; 198457be49d6SMatthias Ringwald channel->waiting_for_can_send_now = 0; 198557be49d6SMatthias Ringwald log_info("L2CAP_EVENT_CHANNEL_LE_CAN_SEND_NOW local_cid 0x%x", channel->local_cid); 198657be49d6SMatthias Ringwald l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_LE_CAN_SEND_NOW); 198757be49d6SMatthias Ringwald } 198857be49d6SMatthias Ringwald 198957be49d6SMatthias Ringwald // 1BH2222 199057be49d6SMatthias Ringwald static void l2cap_emit_le_incoming_connection(l2cap_channel_t *channel) { 199157be49d6SMatthias Ringwald log_info("L2CAP_EVENT_LE_INCOMING_CONNECTION addr_type %u, addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x, remote_mtu %u", 199257be49d6SMatthias Ringwald channel->address_type, bd_addr_to_str(channel->address), channel->con_handle, channel->psm, channel->local_cid, channel->remote_cid, channel->remote_mtu); 199357be49d6SMatthias Ringwald uint8_t event[19]; 199457be49d6SMatthias Ringwald event[0] = L2CAP_EVENT_LE_INCOMING_CONNECTION; 199557be49d6SMatthias Ringwald event[1] = sizeof(event) - 2; 199657be49d6SMatthias Ringwald event[2] = channel->address_type; 199757be49d6SMatthias Ringwald reverse_bd_addr(channel->address, &event[3]); 199857be49d6SMatthias Ringwald little_endian_store_16(event, 9, channel->con_handle); 199957be49d6SMatthias Ringwald little_endian_store_16(event, 11, channel->psm); 200057be49d6SMatthias Ringwald little_endian_store_16(event, 13, channel->local_cid); 200157be49d6SMatthias Ringwald little_endian_store_16(event, 15, channel->remote_cid); 200257be49d6SMatthias Ringwald little_endian_store_16(event, 17, channel->remote_mtu); 200357be49d6SMatthias Ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 200457be49d6SMatthias Ringwald l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 200557be49d6SMatthias Ringwald } 200657be49d6SMatthias Ringwald // 11BH22222 200757be49d6SMatthias Ringwald static void l2cap_emit_le_channel_opened(l2cap_channel_t *channel, uint8_t status) { 200857be49d6SMatthias Ringwald log_info("L2CAP_EVENT_LE_CHANNEL_OPENED status 0x%x addr_type %u addr %s handle 0x%x psm 0x%x local_cid 0x%x remote_cid 0x%x local_mtu %u, remote_mtu %u", 200957be49d6SMatthias Ringwald status, channel->address_type, bd_addr_to_str(channel->address), channel->con_handle, channel->psm, 201057be49d6SMatthias Ringwald channel->local_cid, channel->remote_cid, channel->local_mtu, channel->remote_mtu); 2011*c99bb618SMatthias Ringwald uint8_t event[23]; 201257be49d6SMatthias Ringwald event[0] = L2CAP_EVENT_LE_CHANNEL_OPENED; 201357be49d6SMatthias Ringwald event[1] = sizeof(event) - 2; 201457be49d6SMatthias Ringwald event[2] = status; 201557be49d6SMatthias Ringwald event[3] = channel->address_type; 201657be49d6SMatthias Ringwald reverse_bd_addr(channel->address, &event[4]); 201757be49d6SMatthias Ringwald little_endian_store_16(event, 10, channel->con_handle); 2018*c99bb618SMatthias Ringwald event[12] = channel->state_var & L2CAP_CHANNEL_STATE_VAR_INCOMING ? 1 : 0; 2019*c99bb618SMatthias Ringwald little_endian_store_16(event, 13, channel->psm); 2020*c99bb618SMatthias Ringwald little_endian_store_16(event, 15, channel->local_cid); 2021*c99bb618SMatthias Ringwald little_endian_store_16(event, 17, channel->remote_cid); 2022*c99bb618SMatthias Ringwald little_endian_store_16(event, 19, channel->local_mtu); 2023*c99bb618SMatthias Ringwald little_endian_store_16(event, 21, channel->remote_mtu); 202457be49d6SMatthias Ringwald hci_dump_packet( HCI_EVENT_PACKET, 0, event, sizeof(event)); 202557be49d6SMatthias Ringwald l2cap_dispatch_to_channel(channel, HCI_EVENT_PACKET, event, sizeof(event)); 202657be49d6SMatthias Ringwald } 202757be49d6SMatthias Ringwald 202857be49d6SMatthias Ringwald static l2cap_channel_t * l2cap_le_get_channel_for_local_cid(uint16_t local_cid){ 202957be49d6SMatthias Ringwald btstack_linked_list_iterator_t it; 203057be49d6SMatthias Ringwald btstack_linked_list_iterator_init(&it, &l2cap_le_channels); 203157be49d6SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 203257be49d6SMatthias Ringwald l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it); 203357be49d6SMatthias Ringwald if ( channel->local_cid == local_cid) { 203457be49d6SMatthias Ringwald return channel; 203557be49d6SMatthias Ringwald } 203657be49d6SMatthias Ringwald } 203757be49d6SMatthias Ringwald return NULL; 203857be49d6SMatthias Ringwald } 203957be49d6SMatthias Ringwald 204057be49d6SMatthias Ringwald // finalize closed channel - l2cap_handle_disconnect_request & DISCONNECTION_RESPONSE 204157be49d6SMatthias Ringwald void l2cap_le_finialize_channel_close(l2cap_channel_t * channel){ 204257be49d6SMatthias Ringwald channel->state = L2CAP_STATE_CLOSED; 204357be49d6SMatthias Ringwald l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_CHANNEL_CLOSED); 204457be49d6SMatthias Ringwald // discard channel 204557be49d6SMatthias Ringwald btstack_linked_list_remove(&l2cap_le_channels, (btstack_linked_item_t *) channel); 204657be49d6SMatthias Ringwald btstack_memory_l2cap_channel_free(channel); 204757be49d6SMatthias Ringwald } 204857be49d6SMatthias Ringwald 2049e7d0c9aaSMatthias Ringwald static inline l2cap_service_t * l2cap_le_get_service(uint16_t le_psm){ 2050e7d0c9aaSMatthias Ringwald return l2cap_get_service_internal(&l2cap_le_services, le_psm); 20517192e786SMatthias Ringwald } 2052efedfb4cSMatthias Ringwald 2053da144af5SMatthias Ringwald uint8_t l2cap_le_register_service(btstack_packet_handler_t packet_handler, uint16_t psm, gap_security_level_t security_level){ 20547192e786SMatthias Ringwald 2055da144af5SMatthias Ringwald log_info("L2CAP_LE_REGISTER_SERVICE psm 0x%x", psm); 20567192e786SMatthias Ringwald 20577192e786SMatthias Ringwald // check for alread registered psm 20587192e786SMatthias Ringwald l2cap_service_t *service = l2cap_le_get_service(psm); 20597192e786SMatthias Ringwald if (service) { 2060da144af5SMatthias Ringwald return L2CAP_SERVICE_ALREADY_REGISTERED; 20617192e786SMatthias Ringwald } 20627192e786SMatthias Ringwald 20637192e786SMatthias Ringwald // alloc structure 20647192e786SMatthias Ringwald service = btstack_memory_l2cap_service_get(); 20657192e786SMatthias Ringwald if (!service) { 20667192e786SMatthias Ringwald log_error("l2cap_register_service_internal: no memory for l2cap_service_t"); 2067da144af5SMatthias Ringwald return BTSTACK_MEMORY_ALLOC_FAILED; 20687192e786SMatthias Ringwald } 20697192e786SMatthias Ringwald 20707192e786SMatthias Ringwald // fill in 20717192e786SMatthias Ringwald service->psm = psm; 2072da144af5SMatthias Ringwald service->mtu = 0; 20737192e786SMatthias Ringwald service->packet_handler = packet_handler; 20747192e786SMatthias Ringwald service->required_security_level = security_level; 20757192e786SMatthias Ringwald 20767192e786SMatthias Ringwald // add to services list 2077665d90f2SMatthias Ringwald btstack_linked_list_add(&l2cap_le_services, (btstack_linked_item_t *) service); 20787192e786SMatthias Ringwald 20797192e786SMatthias Ringwald // done 2080da144af5SMatthias Ringwald return 0; 20817192e786SMatthias Ringwald } 20827192e786SMatthias Ringwald 2083da144af5SMatthias Ringwald uint8_t l2cap_le_unregister_service(uint16_t psm) { 20847192e786SMatthias Ringwald log_info("L2CAP_LE_UNREGISTER_SERVICE psm 0x%x", psm); 20857192e786SMatthias Ringwald l2cap_service_t *service = l2cap_le_get_service(psm); 20869367f9b0SMatthias Ringwald if (!service) return L2CAP_SERVICE_DOES_NOT_EXIST; 2087da144af5SMatthias Ringwald 2088665d90f2SMatthias Ringwald btstack_linked_list_remove(&l2cap_le_services, (btstack_linked_item_t *) service); 20897192e786SMatthias Ringwald btstack_memory_l2cap_service_free(service); 2090da144af5SMatthias Ringwald return 0; 20917192e786SMatthias Ringwald } 2092da144af5SMatthias Ringwald 2093da144af5SMatthias Ringwald uint8_t l2cap_le_accept_connection(uint16_t local_cid, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits){ 2094e7d0c9aaSMatthias Ringwald // get channel 2095e7d0c9aaSMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 2096e7d0c9aaSMatthias Ringwald if (!channel) return L2CAP_LOCAL_CID_DOES_NOT_EXIST; 2097e7d0c9aaSMatthias Ringwald 2098e7d0c9aaSMatthias Ringwald // validate state 2099e7d0c9aaSMatthias Ringwald if (channel->state != L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT){ 2100e7d0c9aaSMatthias Ringwald return ERROR_CODE_COMMAND_DISALLOWED; 2101e7d0c9aaSMatthias Ringwald } 2102e7d0c9aaSMatthias Ringwald 2103efedfb4cSMatthias Ringwald // set state accept connection 210423017473SMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_ACCEPT; 210523017473SMatthias Ringwald channel->receive_sdu_buffer = receive_sdu_buffer; 210623017473SMatthias Ringwald channel->local_mtu = mtu; 210785aeef60SMatthias Ringwald channel->new_credits_incoming = initial_credits; 210885aeef60SMatthias Ringwald channel->automatic_credits = initial_credits == L2CAP_LE_AUTOMATIC_CREDITS; 210985aeef60SMatthias Ringwald 211085aeef60SMatthias Ringwald // test 211163f0ac45SMatthias Ringwald // channel->new_credits_incoming = 1; 2112e7d0c9aaSMatthias Ringwald 2113e7d0c9aaSMatthias Ringwald // go 2114e7d0c9aaSMatthias Ringwald l2cap_run(); 2115da144af5SMatthias Ringwald return 0; 2116da144af5SMatthias Ringwald } 2117da144af5SMatthias Ringwald 2118da144af5SMatthias Ringwald /** 2119da144af5SMatthias Ringwald * @brief Deny incoming LE Data Channel connection due to resource constraints 2120da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2121da144af5SMatthias Ringwald */ 2122da144af5SMatthias Ringwald 2123da144af5SMatthias Ringwald uint8_t l2cap_le_decline_connection(uint16_t local_cid){ 2124e7d0c9aaSMatthias Ringwald // get channel 2125e7d0c9aaSMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 2126e7d0c9aaSMatthias Ringwald if (!channel) return L2CAP_LOCAL_CID_DOES_NOT_EXIST; 2127e7d0c9aaSMatthias Ringwald 2128e7d0c9aaSMatthias Ringwald // validate state 2129e7d0c9aaSMatthias Ringwald if (channel->state != L2CAP_STATE_WAIT_CLIENT_ACCEPT_OR_REJECT){ 2130e7d0c9aaSMatthias Ringwald return ERROR_CODE_COMMAND_DISALLOWED; 2131e7d0c9aaSMatthias Ringwald } 2132e7d0c9aaSMatthias Ringwald 2133efedfb4cSMatthias Ringwald // set state decline connection 2134e7d0c9aaSMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_LE_CONNECTION_RESPONSE_DECLINE; 2135e7d0c9aaSMatthias Ringwald channel->reason = 0x04; // no resources available 2136e7d0c9aaSMatthias Ringwald l2cap_run(); 2137da144af5SMatthias Ringwald return 0; 2138da144af5SMatthias Ringwald } 2139da144af5SMatthias Ringwald 21407dafa750SMatthias Ringwald uint8_t l2cap_le_create_channel(btstack_packet_handler_t packet_handler, hci_con_handle_t con_handle, 2141da144af5SMatthias Ringwald uint16_t psm, uint8_t * receive_sdu_buffer, uint16_t mtu, uint16_t initial_credits, gap_security_level_t security_level, 2142efedfb4cSMatthias Ringwald uint16_t * out_local_cid) { 2143efedfb4cSMatthias Ringwald 21447dafa750SMatthias Ringwald log_info("L2CAP_LE_CREATE_CHANNEL handle 0x%04x psm 0x%x mtu %u", con_handle, psm, mtu); 2145da144af5SMatthias Ringwald 21467dafa750SMatthias Ringwald 21477dafa750SMatthias Ringwald hci_connection_t * connection = hci_connection_for_handle(con_handle); 21487dafa750SMatthias Ringwald if (!connection) { 21497dafa750SMatthias Ringwald log_error("no hci_connection for handle 0x%04x", con_handle); 21507dafa750SMatthias Ringwald return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 21517dafa750SMatthias Ringwald } 21527dafa750SMatthias Ringwald 21537dafa750SMatthias Ringwald l2cap_channel_t * channel = l2cap_create_channel_entry(packet_handler, connection->address, connection->address_type, psm, mtu, security_level); 2154da144af5SMatthias Ringwald if (!channel) { 2155da144af5SMatthias Ringwald return BTSTACK_MEMORY_ALLOC_FAILED; 2156da144af5SMatthias Ringwald } 2157e7d0c9aaSMatthias Ringwald log_info("l2cap_le_create_channel %p", channel); 2158da144af5SMatthias Ringwald 2159da144af5SMatthias Ringwald // store local_cid 2160da144af5SMatthias Ringwald if (out_local_cid){ 2161da144af5SMatthias Ringwald *out_local_cid = channel->local_cid; 2162da144af5SMatthias Ringwald } 2163da144af5SMatthias Ringwald 21647dafa750SMatthias Ringwald // provide buffer 21657dafa750SMatthias Ringwald channel->con_handle = con_handle; 2166cd529728SMatthias Ringwald channel->receive_sdu_buffer = receive_sdu_buffer; 21677dafa750SMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_LE_CONNECTION_REQUEST; 216885aeef60SMatthias Ringwald channel->new_credits_incoming = initial_credits; 216985aeef60SMatthias Ringwald channel->automatic_credits = initial_credits == L2CAP_LE_AUTOMATIC_CREDITS; 217085aeef60SMatthias Ringwald 2171efedfb4cSMatthias Ringwald // add to connections list 2172efedfb4cSMatthias Ringwald btstack_linked_list_add(&l2cap_le_channels, (btstack_linked_item_t *) channel); 2173efedfb4cSMatthias Ringwald 21747dafa750SMatthias Ringwald // go 217563f0ac45SMatthias Ringwald l2cap_run(); 2176da144af5SMatthias Ringwald return 0; 2177da144af5SMatthias Ringwald } 2178da144af5SMatthias Ringwald 2179da144af5SMatthias Ringwald /** 2180da144af5SMatthias Ringwald * @brief Provide credtis for LE Data Channel 2181da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2182da144af5SMatthias Ringwald * @param credits Number additional credits for peer 2183da144af5SMatthias Ringwald */ 218464e11ca9SMatthias Ringwald uint8_t l2cap_le_provide_credits(uint16_t local_cid, uint16_t credits){ 218563f0ac45SMatthias Ringwald 218663f0ac45SMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 218763f0ac45SMatthias Ringwald if (!channel) { 218863f0ac45SMatthias Ringwald log_error("l2cap_le_provide_credits no channel for cid 0x%02x", local_cid); 218963f0ac45SMatthias Ringwald return L2CAP_LOCAL_CID_DOES_NOT_EXIST; 219063f0ac45SMatthias Ringwald } 219163f0ac45SMatthias Ringwald 2192efedfb4cSMatthias Ringwald // check state 219363f0ac45SMatthias Ringwald if (channel->state != L2CAP_STATE_OPEN){ 219463f0ac45SMatthias Ringwald log_error("l2cap_le_provide_credits but channel 0x%02x not open yet", local_cid); 219563f0ac45SMatthias Ringwald } 219663f0ac45SMatthias Ringwald 219763f0ac45SMatthias Ringwald // assert incoming credits + credits <= 0xffff 219863f0ac45SMatthias Ringwald uint32_t total_credits = channel->credits_incoming; 219963f0ac45SMatthias Ringwald total_credits += channel->new_credits_incoming; 220063f0ac45SMatthias Ringwald total_credits += credits; 220163f0ac45SMatthias Ringwald if (total_credits > 0xffff){ 220263f0ac45SMatthias Ringwald log_error("l2cap_le_provide_credits overrun: current %u, scheduled %u, additional %u", channel->credits_incoming, 220363f0ac45SMatthias Ringwald channel->new_credits_incoming, credits); 220463f0ac45SMatthias Ringwald } 220563f0ac45SMatthias Ringwald 2206efedfb4cSMatthias Ringwald // set credits_granted 220763f0ac45SMatthias Ringwald channel->new_credits_incoming += credits; 220863f0ac45SMatthias Ringwald 220963f0ac45SMatthias Ringwald // go 221063f0ac45SMatthias Ringwald l2cap_run(); 2211da144af5SMatthias Ringwald return 0; 2212da144af5SMatthias Ringwald } 2213da144af5SMatthias Ringwald 2214da144af5SMatthias Ringwald /** 2215da144af5SMatthias Ringwald * @brief Check if outgoing buffer is available and that there's space on the Bluetooth module 2216da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2217da144af5SMatthias Ringwald */ 221864e11ca9SMatthias Ringwald int l2cap_le_can_send_now(uint16_t local_cid){ 221944276248SMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 222044276248SMatthias Ringwald if (!channel) { 222144276248SMatthias Ringwald log_error("l2cap_le_provide_credits no channel for cid 0x%02x", local_cid); 2222da144af5SMatthias Ringwald return 0; 2223da144af5SMatthias Ringwald } 2224da144af5SMatthias Ringwald 222544276248SMatthias Ringwald // check state 222644276248SMatthias Ringwald if (channel->state != L2CAP_STATE_OPEN) return 0; 222744276248SMatthias Ringwald 222844276248SMatthias Ringwald // check queue 222944276248SMatthias Ringwald if (channel->send_sdu_buffer) return 0; 223044276248SMatthias Ringwald 223144276248SMatthias Ringwald // fine, go ahead 223244276248SMatthias Ringwald return 1; 223344276248SMatthias Ringwald } 223444276248SMatthias Ringwald 2235da144af5SMatthias Ringwald /** 2236da144af5SMatthias Ringwald * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible 2237da144af5SMatthias Ringwald * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function 2238da144af5SMatthias Ringwald * so packet handler should be ready to handle it 2239da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2240da144af5SMatthias Ringwald */ 224164e11ca9SMatthias Ringwald uint8_t l2cap_le_request_can_send_now_event(uint16_t local_cid){ 224244276248SMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 224344276248SMatthias Ringwald if (!channel) { 224444276248SMatthias Ringwald log_error("l2cap_le_request_can_send_now_event no channel for cid 0x%02x", local_cid); 224544276248SMatthias Ringwald return 0; 224644276248SMatthias Ringwald } 224744276248SMatthias Ringwald channel->waiting_for_can_send_now = 1; 224844276248SMatthias Ringwald l2cap_le_notify_channel_can_send(channel); 2249da144af5SMatthias Ringwald return 0; 2250da144af5SMatthias Ringwald } 2251da144af5SMatthias Ringwald 2252da144af5SMatthias Ringwald /** 2253da144af5SMatthias Ringwald * @brief Send data via LE Data Channel 2254da144af5SMatthias Ringwald * @note Since data larger then the maximum PDU needs to be segmented into multiple PDUs, data needs to stay valid until ... event 2255da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2256da144af5SMatthias Ringwald * @param data data to send 2257da144af5SMatthias Ringwald * @param size data size 2258da144af5SMatthias Ringwald */ 225964e11ca9SMatthias Ringwald uint8_t l2cap_le_send_data(uint16_t local_cid, uint8_t * data, uint16_t len){ 226064e11ca9SMatthias Ringwald 226164e11ca9SMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 226264e11ca9SMatthias Ringwald if (!channel) { 226364e11ca9SMatthias Ringwald log_error("l2cap_send no channel for cid 0x%02x", local_cid); 2264828a7f7aSMatthias Ringwald return L2CAP_LOCAL_CID_DOES_NOT_EXIST; 226564e11ca9SMatthias Ringwald } 226664e11ca9SMatthias Ringwald 226764e11ca9SMatthias Ringwald if (len > channel->remote_mtu){ 226864e11ca9SMatthias Ringwald log_error("l2cap_send cid 0x%02x, data length exceeds remote MTU.", local_cid); 226964e11ca9SMatthias Ringwald return L2CAP_DATA_LEN_EXCEEDS_REMOTE_MTU; 227064e11ca9SMatthias Ringwald } 227164e11ca9SMatthias Ringwald 22727f107edaSMatthias Ringwald if (channel->send_sdu_buffer){ 227364e11ca9SMatthias Ringwald log_info("l2cap_send cid 0x%02x, cannot send", local_cid); 227464e11ca9SMatthias Ringwald return BTSTACK_ACL_BUFFERS_FULL; 227564e11ca9SMatthias Ringwald } 227664e11ca9SMatthias Ringwald 22777f107edaSMatthias Ringwald channel->send_sdu_buffer = data; 22787f107edaSMatthias Ringwald channel->send_sdu_len = len; 22797f107edaSMatthias Ringwald channel->send_sdu_pos = 0; 228064e11ca9SMatthias Ringwald 22817f107edaSMatthias Ringwald l2cap_run(); 22827f107edaSMatthias Ringwald return 0; 2283da144af5SMatthias Ringwald } 2284da144af5SMatthias Ringwald 2285da144af5SMatthias Ringwald /** 2286da144af5SMatthias Ringwald * @brief Disconnect from LE Data Channel 2287da144af5SMatthias Ringwald * @param local_cid L2CAP LE Data Channel Identifier 2288da144af5SMatthias Ringwald */ 2289828a7f7aSMatthias Ringwald uint8_t l2cap_le_disconnect(uint16_t local_cid) 2290da144af5SMatthias Ringwald { 2291828a7f7aSMatthias Ringwald l2cap_channel_t * channel = l2cap_le_get_channel_for_local_cid(local_cid); 2292828a7f7aSMatthias Ringwald if (!channel) { 2293828a7f7aSMatthias Ringwald log_error("l2cap_send no channel for cid 0x%02x", local_cid); 2294828a7f7aSMatthias Ringwald return L2CAP_LOCAL_CID_DOES_NOT_EXIST; 2295828a7f7aSMatthias Ringwald } 2296828a7f7aSMatthias Ringwald 2297828a7f7aSMatthias Ringwald channel->state = L2CAP_STATE_WILL_SEND_DISCONNECT_REQUEST; 2298828a7f7aSMatthias Ringwald l2cap_run(); 2299da144af5SMatthias Ringwald return 0; 2300da144af5SMatthias Ringwald } 2301da144af5SMatthias Ringwald 23027f02f414SMatthias Ringwald #endif 230383fd9c76SMatthias Ringwald 230483fd9c76SMatthias Ringwald #endif 2305