tree b43a24e25a2fd456d6da1b85fc1bbb180e022087
parent fcd2daf57cfec0d6572601c905d2d0d92464e777
author Joel Cunningham <joel.cunningham@me.com> 1481328624 -0600
committer Joel Cunningham <joel.cunningham@me.com> 1481902674 -0600

bug #49631: handle zero-window probe and refused_data

This commit adds support for responding to a zero-window probe when
the refused_data pointer is set

A zero-window probe is a data segment received when rcv_ann_wnd
is 0. This corrects a standards violation where LwIP would not
respond to a zero-window probe with its current ACK value (RCV.NXT)
when it has refused data, thus leading to the probing TCP closing
out the connection