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l2cap ertm: allow SDU of szie MPS in first packet that contains L2CAP SDU Length

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Matthias Ringwald 2018-10-03 17:21:11 +02:00
parent 5dcb6ca761
commit 826c39d019
2 changed files with 21 additions and 5 deletions
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1
CHANGELOG.md
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@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
### Fixed
- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist
- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length
- HFP: decline incoming RFCOMM connection after outgoing connection was started
## Changes September 2018

25
src/l2cap.c
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@ -3200,11 +3200,26 @@ static void l2cap_acl_classic_handler(hci_con_handle_t handle, uint8_t *packet,
}
// get SDU
const uint8_t * sdu_data = &packet[COMPLETE_L2CAP_HEADER+2];
uint16_t sdu_len = size-(COMPLETE_L2CAP_HEADER+2+fcs_size);
const uint8_t * payload_data = &packet[COMPLETE_L2CAP_HEADER+2];
uint16_t payload_len = size-(COMPLETE_L2CAP_HEADER+2+fcs_size);
// assert SDU size is smaller or equal to our buffers
if (sdu_len > l2cap_channel->local_mps) break;
uint16_t max_payload_size = 0;
switch (sar){
case L2CAP_SEGMENTATION_AND_REASSEMBLY_UNSEGMENTED_L2CAP_SDU:
case L2CAP_SEGMENTATION_AND_REASSEMBLY_START_OF_L2CAP_SDU:
// SDU Length + MPS
max_payload_size = l2cap_channel->local_mps + 2;
break;
case L2CAP_SEGMENTATION_AND_REASSEMBLY_CONTINUATION_OF_L2CAP_SDU:
case L2CAP_SEGMENTATION_AND_REASSEMBLY_END_OF_L2CAP_SDU:
max_payload_size = l2cap_channel->local_mps;
break;
}
if (payload_len > max_payload_size){
log_info("payload len %u > max payload %u -> drop packet", payload_len, max_payload_size);
break;
}
// check ordering
if (l2cap_channel->expected_tx_seq == tx_seq){
@ -3213,7 +3228,7 @@ static void l2cap_acl_classic_handler(hci_con_handle_t handle, uint8_t *packet,
l2cap_channel->req_seq = l2cap_channel->expected_tx_seq;
// process SDU
l2cap_ertm_handle_in_sequence_sdu(l2cap_channel, sar, sdu_data, sdu_len);
l2cap_ertm_handle_in_sequence_sdu(l2cap_channel, sar, payload_data, payload_len);
// process stored segments
while (1){
@ -3243,7 +3258,7 @@ static void l2cap_acl_classic_handler(hci_con_handle_t handle, uint8_t *packet,
int delta = (tx_seq - l2cap_channel->expected_tx_seq) & 0x3f;
if (delta < 2){
// store segment
l2cap_ertm_handle_out_of_sequence_sdu(l2cap_channel, sar, delta, sdu_data, sdu_len);
l2cap_ertm_handle_out_of_sequence_sdu(l2cap_channel, sar, delta, payload_data, payload_len);
log_info("Received unexpected frame TxSeq %u but expected %u -> send S-SREJ", tx_seq, l2cap_channel->expected_tx_seq);
l2cap_channel->send_supervisor_frame_selective_reject = 1;