github.com/nicocha30/gvisor-ligolo@v0.0.0-20230726075806-989fa2c0a413/pkg/tcpip/transport/packet/endpoint_state.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package packet
    16  
    17  import (
    18  	"fmt"
    19  	"time"
    20  
    21  	"github.com/nicocha30/gvisor-ligolo/pkg/tcpip"
    22  	"github.com/nicocha30/gvisor-ligolo/pkg/tcpip/stack"
    23  )
    24  
    25  // saveReceivedAt is invoked by stateify.
    26  func (p *packet) saveReceivedAt() int64 {
    27  	return p.receivedAt.UnixNano()
    28  }
    29  
    30  // loadReceivedAt is invoked by stateify.
    31  func (p *packet) loadReceivedAt(nsec int64) {
    32  	p.receivedAt = time.Unix(0, nsec)
    33  }
    34  
    35  // beforeSave is invoked by stateify.
    36  func (ep *endpoint) beforeSave() {
    37  	ep.rcvMu.Lock()
    38  	defer ep.rcvMu.Unlock()
    39  	ep.rcvDisabled = true
    40  }
    41  
    42  // afterLoad is invoked by stateify.
    43  func (ep *endpoint) afterLoad() {
    44  	ep.mu.Lock()
    45  	defer ep.mu.Unlock()
    46  
    47  	ep.stack = stack.StackFromEnv
    48  	ep.ops.InitHandler(ep, ep.stack, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
    49  
    50  	if err := ep.stack.RegisterPacketEndpoint(ep.boundNIC, ep.boundNetProto, ep); err != nil {
    51  		panic(fmt.Sprintf("RegisterPacketEndpoint(%d, %d, _): %s", ep.boundNIC, ep.boundNetProto, err))
    52  	}
    53  
    54  	ep.rcvMu.Lock()
    55  	ep.rcvDisabled = false
    56  	ep.rcvMu.Unlock()
    57  }