Test TCP sender behavior against window shrinking

RFC 1122 Section 3.7: A sending TCP MUST be robust against window shrinking,
which may cause the "useable window" to become negative.

PiperOrigin-RevId: 305377072

1 files changed, 27 insertions, 0 deletions

diff --git a/test/packetimpact/proto/posix_server.proto b/test/packetimpact/proto/posix_server.proto
index 1565f31fa..4035e1ee6 100644
--- a/test/packetimpact/proto/posix_server.proto
+++ b/test/packetimpact/proto/posix_server.proto
@@ -93,6 +93,17 @@ message ListenResponse {
   int32 errno_ = 2;  // "errno" may fail to compile in c++.
 }
 
+message SendRequest {
+  int32 sockfd = 1;
+  bytes buf = 2;
+  int32 flags = 3;
+}
+
+message SendResponse {
+  int32 ret = 1;
+  int32 errno_ = 2;
+}
+
 message SetSockOptRequest {
   int32 sockfd = 1;
   int32 level = 2;
@@ -105,6 +116,18 @@ message SetSockOptResponse {
   int32 errno_ = 2;  // "errno" may fail to compile in c++.
 }
 
+message SetSockOptIntRequest {
+  int32 sockfd = 1;
+  int32 level = 2;
+  int32 optname = 3;
+  int32 intval = 4;
+}
+
+message SetSockOptIntResponse {
+  int32 ret = 1;
+  int32 errno_ = 2;
+}
+
 message SetSockOptTimevalRequest {
   int32 sockfd = 1;
   int32 level = 2;
@@ -151,11 +174,15 @@ service Posix {
   rpc GetSockName(GetSockNameRequest) returns (GetSockNameResponse);
   // Call listen() on the DUT.
   rpc Listen(ListenRequest) returns (ListenResponse);
+  // Call send() on the DUT.
+  rpc Send(SendRequest) returns (SendResponse);
   // Call setsockopt() on the DUT.  You should prefer one of the other
   // SetSockOpt* functions with a more structured optval or else you may get the
   // encoding wrong, such as making a bad assumption about the server's word
   // sizes or endianness.
   rpc SetSockOpt(SetSockOptRequest) returns (SetSockOptResponse);
+  // Call setsockopt() on the DUT with an int optval.
+  rpc SetSockOptInt(SetSockOptIntRequest) returns (SetSockOptIntResponse);
   // Call setsockopt() on the DUT with a Timeval optval.
   rpc SetSockOptTimeval(SetSockOptTimevalRequest)
       returns (SetSockOptTimevalResponse);