2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package header
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import "encoding/binary"
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// These constants are declared in linux/virtio_net.h.
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const (
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_VIRTIO_NET_HDR_F_NEEDS_CSUM = 1
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_VIRTIO_NET_HDR_GSO_NONE = 0
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_VIRTIO_NET_HDR_GSO_TCPV4 = 1
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_VIRTIO_NET_HDR_GSO_TCPV6 = 4
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)
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const (
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// VirtioNetHeaderSize is the size of VirtioNetHeader in bytes.
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VirtioNetHeaderSize = 10
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)
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// Offsets for fields in the virtio net header.
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const (
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flags = 0
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gsoType = 1
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hdrLen = 2
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gsoSize = 4
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csumStart = 6
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csumOffset = 8
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)
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// VirtioNetHeaderFields is the Go equivalent of the struct declared in
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// linux/virtio_net.h.
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type VirtioNetHeaderFields struct {
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Flags uint8
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GSOType uint8
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HdrLen uint16
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GSOSize uint16
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CSumStart uint16
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CSumOffset uint16
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}
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// VirtioNetHeader represents a virtio net header stored in a byte array.
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type VirtioNetHeader []byte
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// Flags returns the "flags" field of the virtio net header.
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func (v VirtioNetHeader) Flags() uint8 {
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return uint8(v[flags])
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}
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// GSOType returns the "gsoType" field of the virtio net header.
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func (v VirtioNetHeader) GSOType() uint8 {
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return uint8(v[gsoType])
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}
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// HdrLen returns the "hdrLen" field of the virtio net header.
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func (v VirtioNetHeader) HdrLen() uint16 {
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return binary.BigEndian.Uint16(v[hdrLen:])
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}
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// GSOSize returns the "gsoSize" field of the virtio net header.
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func (v VirtioNetHeader) GSOSize() uint16 {
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return binary.BigEndian.Uint16(v[gsoSize:])
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}
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// CSumStart returns the "csumStart" field of the virtio net header.
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func (v VirtioNetHeader) CSumStart() uint16 {
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return binary.BigEndian.Uint16(v[csumStart:])
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}
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// CSumOffset returns the "csumOffset" field of the virtio net header.
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func (v VirtioNetHeader) CSumOffset() uint16 {
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return binary.BigEndian.Uint16(v[csumOffset:])
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}
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// Encode encodes all the fields of the virtio net header.
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func (v VirtioNetHeader) Encode(f *VirtioNetHeaderFields) {
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v[flags] = uint8(f.Flags)
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v[gsoType] = uint8(f.GSOType)
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binary.LittleEndian.PutUint16(v[hdrLen:], f.HdrLen)
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binary.LittleEndian.PutUint16(v[gsoSize:], f.GSOSize)
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binary.LittleEndian.PutUint16(v[csumStart:], f.CSumStart)
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binary.LittleEndian.PutUint16(v[csumOffset:], f.CSumOffset)
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}
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