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l2cap-ertm: release ertm buffer if ertm not supported by remote

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This commit is contained in:
Matthias Ringwald 2019-09-30 21:37:49 +02:00
parent 836ae835de
commit 8b7155e095
1 changed files with 9 additions and 11 deletions
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20
src/l2cap.c
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@ -660,26 +660,24 @@ uint8_t l2cap_accept_ertm_connection(uint16_t local_cid, l2cap_ertm_config_t * e
// default: continue
channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_ACCEPT;
// assert ERTM is supported by remote if mandatory for us
// verify remote ERTM support
hci_connection_t * connection = hci_connection_for_handle(channel->con_handle);
if (connection == NULL) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
if ((channel->mode == L2CAP_CHANNEL_MODE_ENHANCED_RETRANSMISSION) && ((connection->l2cap_state.extended_feature_mask & 0x08) == 0)){
// ERTM not possible, select basic mode and release buffer
channel->mode = L2CAP_CHANNEL_MODE_BASIC;
l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_ERTM_BUFFER_RELEASED);
// bail if ERTM was requested but is not supported
// bail if ERTM is mandatory
if (channel->ertm_mandatory){
// We chose 'no resources available' for "ERTM mandatory but you don't even know ERTM exists"
log_info("ERTM not supported by remote but mandatory -> reject connection");
log_info("ERTM mandatory -> reject connection");
channel->state = L2CAP_STATE_WILL_SEND_CONNECTION_RESPONSE_DECLINE;
channel->reason = 0x04; // no resources available
}
// fallback to Basic mode
else {
log_info("ERTM not supported by remote -> fallback Basic mode");
l2cap_emit_simple_event_with_cid(channel, L2CAP_EVENT_ERTM_BUFFER_RELEASED);
channel->mode = L2CAP_CHANNEL_MODE_BASIC;
}
} else {
log_info("ERTM not supported by remote -> use Basic mode");
}
}
// process