github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/fs/proc/sys_net_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 proc
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/SagerNet/gvisor/pkg/tcpip/network/ipv4"
    21  )
    22  
    23  // beforeSave is invoked by stateify.
    24  func (t *tcpMemInode) beforeSave() {
    25  	size, err := readSize(t.dir, t.s)
    26  	if err != nil {
    27  		panic(fmt.Sprintf("failed to read TCP send / receive buffer sizes: %v", err))
    28  	}
    29  	t.size = size
    30  }
    31  
    32  // afterLoad is invoked by stateify.
    33  func (t *tcpMemInode) afterLoad() {
    34  	if err := writeSize(t.dir, t.s, t.size); err != nil {
    35  		panic(fmt.Sprintf("failed to write previous TCP send / receive buffer sizes [%v]: %v", t.size, err))
    36  	}
    37  }
    38  
    39  // afterLoad is invoked by stateify.
    40  func (s *tcpSack) afterLoad() {
    41  	if s.enabled != nil {
    42  		if err := s.stack.SetTCPSACKEnabled(*s.enabled); err != nil {
    43  			panic(fmt.Sprintf("failed to set previous TCP sack configuration [%v]: %v", *s.enabled, err))
    44  		}
    45  	}
    46  }
    47  
    48  // afterLoad is invoked by stateify.
    49  func (ipf *ipForwarding) afterLoad() {
    50  	if err := ipf.stack.SetForwarding(ipv4.ProtocolNumber, ipf.enabled); err != nil {
    51  		panic(fmt.Sprintf("ipf.stack.SetForwarding(%d, %t): %s", ipv4.ProtocolNumber, ipf.enabled, err))
    52  	}
    53  }