// 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 tcpip

import (
	"sync/atomic"
)

// SocketOptions contains all the variables which store values for SOL_SOCKET
// level options.
//
// +stateify savable
type SocketOptions struct {
	// These fields are accessed and modified using atomic operations.

	// broadcastEnabled determines whether datagram sockets are allowed to send
	// packets to a broadcast address.
	broadcastEnabled uint32

	// passCredEnabled determines whether SCM_CREDENTIALS socket control messages
	// are enabled.
	passCredEnabled uint32

	// noChecksumEnabled determines whether UDP checksum is disabled while
	// transmitting for this socket.
	noChecksumEnabled uint32
}

func storeAtomicBool(addr *uint32, v bool) {
	var val uint32
	if v {
		val = 1
	}
	atomic.StoreUint32(addr, val)
}

// GetBroadcast gets value for SO_BROADCAST option.
func (so *SocketOptions) GetBroadcast() bool {
	return atomic.LoadUint32(&so.broadcastEnabled) != 0
}

// SetBroadcast sets value for SO_BROADCAST option.
func (so *SocketOptions) SetBroadcast(v bool) {
	storeAtomicBool(&so.broadcastEnabled, v)
}

// GetPassCred gets value for SO_PASSCRED option.
func (so *SocketOptions) GetPassCred() bool {
	return atomic.LoadUint32(&so.passCredEnabled) != 0
}

// SetPassCred sets value for SO_PASSCRED option.
func (so *SocketOptions) SetPassCred(v bool) {
	storeAtomicBool(&so.passCredEnabled, v)
}

// GetNoChecksum gets value for SO_NO_CHECK option.
func (so *SocketOptions) GetNoChecksum() bool {
	return atomic.LoadUint32(&so.noChecksumEnabled) != 0
}

// SetNoChecksum sets value for SO_NO_CHECK option.
func (so *SocketOptions) SetNoChecksum(v bool) {
	storeAtomicBool(&so.noChecksumEnabled, v)
}