if (!(seq_leq (tc->snd_una, vnet_buffer (b)->tcp.ack_number)
&& seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
{
- if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
- && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
- {
- tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
- goto acceptable;
- }
*error = TCP_ERROR_ACK_INVALID;
return -1;
}
-acceptable:
tc->bytes_acked = vnet_buffer (b)->tcp.ack_number - tc->snd_una;
tc->snd_una = vnet_buffer (b)->tcp.ack_number;
*error = TCP_ERROR_ACK_OK;
/* If the ACK acks something not yet sent (SEG.ACK > SND.NXT) */
if (PREDICT_FALSE (seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)))
{
- /* We've probably entered recovery and the peer still has some
- * of the data we've sent. Update snd_nxt and accept the ack */
- if (seq_leq (vnet_buffer (b)->tcp.ack_number, tc->snd_nxt)
- && seq_gt (vnet_buffer (b)->tcp.ack_number, tc->snd_una))
- {
- tc->snd_nxt = vnet_buffer (b)->tcp.ack_number;
- goto process_ack;
- }
-
tc->errors.above_ack_wnd += 1;
*error = TCP_ERROR_ACK_FUTURE;
TCP_EVT (TCP_EVT_ACK_RCV_ERR, tc, 0, vnet_buffer (b)->tcp.ack_number);
return 0;
}
-process_ack:
-
/*
* Looks okay, process feedback
*/