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l2cap: limit remote MTU to size of outgoing HCI buffer

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This commit is contained in:
Matthias Ringwald 2017-07-03 13:48:43 +02:00
parent f97cfcbbaa
commit 9d139fbae6
1 changed files with 9 additions and 7 deletions
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16
src/l2cap.c
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@ -968,12 +968,11 @@ static l2cap_channel_t * l2cap_create_channel_entry(btstack_packet_handler_t pac
* @param local_cid
*/
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){
log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u", bd_addr_to_str(address), psm, local_mtu);
if (local_mtu > l2cap_max_mtu()) {
local_mtu = l2cap_max_mtu();
}
uint8_t l2cap_create_channel(btstack_packet_handler_t channel_packet_handler, bd_addr_t address, uint16_t psm, uint16_t mtu, uint16_t * out_local_cid){
// limit MTU to the size of our outtgoing HCI buffer
uint16_t local_mtu = btstack_min(mtu, l2cap_max_mtu());
log_info("L2CAP_CREATE_CHANNEL addr %s psm 0x%x mtu %u -> local mtu %u", bd_addr_to_str(address), psm, mtu, local_mtu);
l2cap_channel_t * channel = l2cap_create_channel_entry(channel_packet_handler, address, BD_ADDR_TYPE_CLASSIC, psm, local_mtu, LEVEL_0);
if (!channel) {
@ -1361,7 +1360,10 @@ static void l2cap_signaling_handle_configure_request(l2cap_channel_t *channel, u
// MTU { type(8): 1, len(8):2, MTU(16) }
if (option_type == 1 && length == 2){
channel->remote_mtu = little_endian_read_16(command, pos);
// log_info("l2cap cid 0x%02x, remote mtu %u", channel->local_cid, channel->remote_mtu);
if (channel->remote_mtu > l2cap_max_mtu()){
log_info("Remote MTU %u larger than outgoing buffer, only using MTU = %u", channel->remote_mtu, l2cap_max_mtu());
channel->remote_mtu = l2cap_max_mtu();
}
channelStateVarSetFlag(channel, L2CAP_CHANNEL_STATE_VAR_SEND_CONF_RSP_MTU);
}
// Flush timeout { type(8):2, len(8): 2, Flush Timeout(16)}