| // Copyright 2020 The gVisor Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package rcv_test |
| |
| import ( |
| "testing" |
| |
| "gvisor.dev/gvisor/pkg/tcpip/header" |
| "gvisor.dev/gvisor/pkg/tcpip/seqnum" |
| ) |
| |
| func TestAcceptable(t *testing.T) { |
| for _, tt := range []struct { |
| segSeq seqnum.Value |
| segLen seqnum.Size |
| rcvNxt, rcvAcc seqnum.Value |
| want bool |
| }{ |
| // The segment is smaller than the window. |
| {105, 2, 100, 104, false}, |
| {105, 2, 101, 105, true}, |
| {105, 2, 102, 106, true}, |
| {105, 2, 103, 107, true}, |
| {105, 2, 104, 108, true}, |
| {105, 2, 105, 109, true}, |
| {105, 2, 106, 110, true}, |
| {105, 2, 107, 111, false}, |
| |
| // The segment is larger than the window. |
| {105, 4, 103, 105, true}, |
| {105, 4, 104, 106, true}, |
| {105, 4, 105, 107, true}, |
| {105, 4, 106, 108, true}, |
| {105, 4, 107, 109, true}, |
| {105, 4, 108, 110, true}, |
| {105, 4, 109, 111, false}, |
| {105, 4, 110, 112, false}, |
| |
| // The segment has no width. |
| {105, 0, 100, 102, false}, |
| {105, 0, 101, 103, false}, |
| {105, 0, 102, 104, false}, |
| {105, 0, 103, 105, true}, |
| {105, 0, 104, 106, true}, |
| {105, 0, 105, 107, true}, |
| {105, 0, 106, 108, false}, |
| {105, 0, 107, 109, false}, |
| |
| // The receive window has no width. |
| {105, 2, 103, 103, false}, |
| {105, 2, 104, 104, false}, |
| {105, 2, 105, 105, false}, |
| {105, 2, 106, 106, false}, |
| {105, 2, 107, 107, false}, |
| {105, 2, 108, 108, false}, |
| {105, 2, 109, 109, false}, |
| } { |
| if got := header.Acceptable(tt.segSeq, tt.segLen, tt.rcvNxt, tt.rcvAcc); got != tt.want { |
| t.Errorf("header.Acceptable(%d, %d, %d, %d) = %t, want %t", tt.segSeq, tt.segLen, tt.rcvNxt, tt.rcvAcc, got, tt.want) |
| } |
| } |
| } |