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// Copyright 2020 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 stack
import (
"gvisor.dev/gvisor/pkg/tcpip"
)
const (
// MinBufferSize is the smallest size of a receive or send buffer.
MinBufferSize = 4 << 10 // 4 KiB
// DefaultBufferSize is the default size of the send/recv buffer for a
// transport endpoint.
DefaultBufferSize = 212 << 10 // 212 KiB
// DefaultMaxBufferSize is the default maximum permitted size of a
// send/receive buffer.
DefaultMaxBufferSize = 4 << 20 // 4 MiB
)
// ReceiveBufferSizeOption is used by stack.(Stack*).Option/SetOption to
// get/set the default, min and max receive buffer sizes.
type ReceiveBufferSizeOption struct {
Min int
Default int
Max int
}
// SetOption allows setting stack wide options.
func (s *Stack) SetOption(option interface{}) tcpip.Error {
switch v := option.(type) {
case tcpip.SendBufferSizeOption:
// Make sure we don't allow lowering the buffer below minimum
// required for stack to work.
if v.Min < MinBufferSize {
return &tcpip.ErrInvalidOptionValue{}
}
if v.Default < v.Min || v.Default > v.Max {
return &tcpip.ErrInvalidOptionValue{}
}
s.mu.Lock()
s.sendBufferSize = v
s.mu.Unlock()
return nil
case ReceiveBufferSizeOption:
// Make sure we don't allow lowering the buffer below minimum
// required for stack to work.
if v.Min < MinBufferSize {
return &tcpip.ErrInvalidOptionValue{}
}
if v.Default < v.Min || v.Default > v.Max {
return &tcpip.ErrInvalidOptionValue{}
}
s.mu.Lock()
s.receiveBufferSize = v
s.mu.Unlock()
return nil
default:
return &tcpip.ErrUnknownProtocolOption{}
}
}
// Option allows retrieving stack wide options.
func (s *Stack) Option(option interface{}) tcpip.Error {
switch v := option.(type) {
case *tcpip.SendBufferSizeOption:
s.mu.RLock()
*v = s.sendBufferSize
s.mu.RUnlock()
return nil
case *ReceiveBufferSizeOption:
s.mu.RLock()
*v = s.receiveBufferSize
s.mu.RUnlock()
return nil
default:
return &tcpip.ErrUnknownProtocolOption{}
}
}
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