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// Copyright 2018 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 epsocket
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/sentry/inet"
"gvisor.dev/gvisor/pkg/sentry/socket/netfilter"
"gvisor.dev/gvisor/pkg/syserr"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/iptables"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
)
// Stack implements inet.Stack for netstack/tcpip/stack.Stack.
//
// +stateify savable
type Stack struct {
Stack *stack.Stack `state:"manual"`
}
// SupportsIPv6 implements Stack.SupportsIPv6.
func (s *Stack) SupportsIPv6() bool {
return s.Stack.CheckNetworkProtocol(ipv6.ProtocolNumber)
}
// Interfaces implements inet.Stack.Interfaces.
func (s *Stack) Interfaces() map[int32]inet.Interface {
is := make(map[int32]inet.Interface)
for id, ni := range s.Stack.NICInfo() {
var devType uint16
if ni.Flags.Loopback {
devType = linux.ARPHRD_LOOPBACK
}
is[int32(id)] = inet.Interface{
Name: ni.Name,
Addr: []byte(ni.LinkAddress),
Flags: uint32(nicStateFlagsToLinux(ni.Flags)),
DeviceType: devType,
MTU: ni.MTU,
}
}
return is
}
// InterfaceAddrs implements inet.Stack.InterfaceAddrs.
func (s *Stack) InterfaceAddrs() map[int32][]inet.InterfaceAddr {
nicAddrs := make(map[int32][]inet.InterfaceAddr)
for id, ni := range s.Stack.NICInfo() {
var addrs []inet.InterfaceAddr
for _, a := range ni.ProtocolAddresses {
var family uint8
switch a.Protocol {
case ipv4.ProtocolNumber:
family = linux.AF_INET
case ipv6.ProtocolNumber:
family = linux.AF_INET6
default:
log.Warningf("Unknown network protocol in %+v", a)
continue
}
addrs = append(addrs, inet.InterfaceAddr{
Family: family,
PrefixLen: uint8(a.AddressWithPrefix.PrefixLen),
Addr: []byte(a.AddressWithPrefix.Address),
// TODO(b/68878065): Other fields.
})
}
nicAddrs[int32(id)] = addrs
}
return nicAddrs
}
// TCPReceiveBufferSize implements inet.Stack.TCPReceiveBufferSize.
func (s *Stack) TCPReceiveBufferSize() (inet.TCPBufferSize, error) {
var rs tcp.ReceiveBufferSizeOption
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &rs)
return inet.TCPBufferSize{
Min: rs.Min,
Default: rs.Default,
Max: rs.Max,
}, syserr.TranslateNetstackError(err).ToError()
}
// SetTCPReceiveBufferSize implements inet.Stack.SetTCPReceiveBufferSize.
func (s *Stack) SetTCPReceiveBufferSize(size inet.TCPBufferSize) error {
rs := tcp.ReceiveBufferSizeOption{
Min: size.Min,
Default: size.Default,
Max: size.Max,
}
return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, rs)).ToError()
}
// TCPSendBufferSize implements inet.Stack.TCPSendBufferSize.
func (s *Stack) TCPSendBufferSize() (inet.TCPBufferSize, error) {
var ss tcp.SendBufferSizeOption
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &ss)
return inet.TCPBufferSize{
Min: ss.Min,
Default: ss.Default,
Max: ss.Max,
}, syserr.TranslateNetstackError(err).ToError()
}
// SetTCPSendBufferSize implements inet.Stack.SetTCPSendBufferSize.
func (s *Stack) SetTCPSendBufferSize(size inet.TCPBufferSize) error {
ss := tcp.SendBufferSizeOption{
Min: size.Min,
Default: size.Default,
Max: size.Max,
}
return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, ss)).ToError()
}
// TCPSACKEnabled implements inet.Stack.TCPSACKEnabled.
func (s *Stack) TCPSACKEnabled() (bool, error) {
var sack tcp.SACKEnabled
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &sack)
return bool(sack), syserr.TranslateNetstackError(err).ToError()
}
// SetTCPSACKEnabled implements inet.Stack.SetTCPSACKEnabled.
func (s *Stack) SetTCPSACKEnabled(enabled bool) error {
return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SACKEnabled(enabled))).ToError()
}
// Statistics implements inet.Stack.Statistics.
func (s *Stack) Statistics(stat interface{}, arg string) error {
return syserr.ErrEndpointOperation.ToError()
}
// RouteTable implements inet.Stack.RouteTable.
func (s *Stack) RouteTable() []inet.Route {
var routeTable []inet.Route
for _, rt := range s.Stack.GetRouteTable() {
var family uint8
switch len(rt.Destination) {
case header.IPv4AddressSize:
family = linux.AF_INET
case header.IPv6AddressSize:
family = linux.AF_INET6
default:
log.Warningf("Unknown network protocol in route %+v", rt)
continue
}
dstSubnet, err := tcpip.NewSubnet(rt.Destination, rt.Mask)
if err != nil {
log.Warningf("Invalid destination & mask in route: %s(%s): %v", rt.Destination, rt.Mask, err)
continue
}
routeTable = append(routeTable, inet.Route{
Family: family,
DstLen: uint8(dstSubnet.Prefix()), // The CIDR prefix for the destination.
// Always return unspecified protocol since we have no notion of
// protocol for routes.
Protocol: linux.RTPROT_UNSPEC,
// Set statically to LINK scope for now.
//
// TODO(gvisor.dev/issue/595): Set scope for routes.
Scope: linux.RT_SCOPE_LINK,
Type: linux.RTN_UNICAST,
DstAddr: []byte(rt.Destination),
OutputInterface: int32(rt.NIC),
GatewayAddr: []byte(rt.Gateway),
})
}
return routeTable
}
// IPTables returns the stack's iptables.
func (s *Stack) IPTables() (iptables.IPTables, error) {
return s.Stack.IPTables(), nil
}
// FillDefaultIPTables sets the stack's iptables to the default tables, which
// allow and do not modify all traffic.
func (s *Stack) FillDefaultIPTables() {
netfilter.FillDefaultIPTables(s.Stack)
}
// Resume implements inet.Stack.Resume.
func (s *Stack) Resume() {
s.Stack.Resume()
}
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