| // Copyright 2018 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 header_test |
| |
| import ( |
| "testing" |
| |
| "gvisor.dev/gvisor/pkg/tcpip/header" |
| ) |
| |
| func TestIPv4(t *testing.T) { |
| b := header.IPv4(make([]byte, header.IPv4MinimumSize)) |
| b.Encode(&header.IPv4Fields{}) |
| |
| const want = header.IPv4Version |
| if v := header.IPVersion(b); v != want { |
| t.Fatalf("Bad version, want %v, got %v", want, v) |
| } |
| } |
| |
| func TestIPv6(t *testing.T) { |
| b := header.IPv6(make([]byte, header.IPv6MinimumSize)) |
| b.Encode(&header.IPv6Fields{}) |
| |
| const want = header.IPv6Version |
| if v := header.IPVersion(b); v != want { |
| t.Fatalf("Bad version, want %v, got %v", want, v) |
| } |
| } |
| |
| func TestOtherVersion(t *testing.T) { |
| const want = header.IPv4Version + header.IPv6Version |
| b := make([]byte, 1) |
| b[0] = want << 4 |
| |
| if v := header.IPVersion(b); v != want { |
| t.Fatalf("Bad version, want %v, got %v", want, v) |
| } |
| } |
| |
| func TestTooShort(t *testing.T) { |
| b := make([]byte, 1) |
| b[0] = (header.IPv4Version + header.IPv6Version) << 4 |
| |
| // Get the version of a zero-length slice. |
| const want = -1 |
| if v := header.IPVersion(b[:0]); v != want { |
| t.Fatalf("Bad version, want %v, got %v", want, v) |
| } |
| |
| // Get the version of a nil slice. |
| if v := header.IPVersion(nil); v != want { |
| t.Fatalf("Bad version, want %v, got %v", want, v) |
| } |
| } |