83 lines
2.8 KiB
Go
83 lines
2.8 KiB
Go
// Copyright 2018 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 tcp
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import (
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"time"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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)
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// saveData is invoked by stateify.
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func (s *segment) saveData() buffer.VectorisedView {
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// We cannot save s.data directly as s.data.views may alias to s.views,
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// which is not allowed by state framework (in-struct pointer).
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v := make([]buffer.View, len(s.data.Views()))
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// For views already delivered, we cannot save them directly as they may
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// have already been sliced and saved elsewhere (e.g., readViews).
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for i := 0; i < s.viewToDeliver; i++ {
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v[i] = append([]byte(nil), s.data.Views()[i]...)
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}
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for i := s.viewToDeliver; i < len(v); i++ {
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v[i] = s.data.Views()[i]
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}
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return buffer.NewVectorisedView(s.data.Size(), v)
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}
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// loadData is invoked by stateify.
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func (s *segment) loadData(data buffer.VectorisedView) {
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// NOTE: We cannot do the s.data = data.Clone(s.views[:]) optimization
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// here because data.views is not guaranteed to be loaded by now. Plus,
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// data.views will be allocated anyway so there really is little point
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// of utilizing s.views for data.views.
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s.data = data
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}
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// saveOptions is invoked by stateify.
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func (s *segment) saveOptions() []byte {
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// We cannot save s.options directly as it may point to s.data's trimmed
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// tail, which is not allowed by state framework (in-struct pointer).
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b := make([]byte, 0, cap(s.options))
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return append(b, s.options...)
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}
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// loadOptions is invoked by stateify.
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func (s *segment) loadOptions(options []byte) {
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// NOTE: We cannot point s.options back into s.data's trimmed tail. But
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// it is OK as they do not need to aliased. Plus, options is already
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// allocated so there is no cost here.
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s.options = options
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}
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// saveRcvdTime is invoked by stateify.
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func (s *segment) saveRcvdTime() unixTime {
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return unixTime{s.rcvdTime.Unix(), s.rcvdTime.UnixNano()}
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}
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// loadRcvdTime is invoked by stateify.
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func (s *segment) loadRcvdTime(unix unixTime) {
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s.rcvdTime = time.Unix(unix.second, unix.nano)
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}
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// saveXmitTime is invoked by stateify.
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func (s *segment) saveXmitTime() unixTime {
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return unixTime{s.rcvdTime.Unix(), s.rcvdTime.UnixNano()}
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}
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// loadXmitTime is invoked by stateify.
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func (s *segment) loadXmitTime(unix unixTime) {
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s.rcvdTime = time.Unix(unix.second, unix.nano)
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}
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