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gnrc_tcp: do not reopen recv window on closed connection

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This commit is contained in:
Simon Brummer 2019-10-06 12:13:37 +02:00
parent e9e0001239
commit 4fbc0252e1
1 changed files with 5 additions and 3 deletions
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8
sys/net/gnrc/transport_layer/tcp/gnrc_tcp_fsm.c
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@ -307,9 +307,11 @@ static int _fsm_call_recv(gnrc_tcp_tcb_t *tcb, void *buf, size_t len)
/* Read data into 'buf' up to 'len' bytes from receive buffer */
size_t rcvd = ringbuffer_get(&(tcb->rcv_buf), buf, len);
/* If receive buffer can store more than GNRC_TCP_MSS: open window to available buffer size */
if (ringbuffer_get_free(&tcb->rcv_buf) >= GNRC_TCP_MSS) {
tcb->rcv_wnd = ringbuffer_get_free(&(tcb->rcv_buf));
/* Reopen window if recv buffer can hold a MSS sized payload and FIN was not received. */
uint16_t buf_free = ringbuffer_get_free(&tcb->rcv_buf);
if (buf_free >= GNRC_TCP_MSS && tcb->state != FSM_STATE_CLOSE_WAIT) {
tcb->rcv_wnd = buf_free;
/* Send ACK to anounce window update */
gnrc_pktsnip_t *out_pkt = NULL;