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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 netstack
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/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 {
switch stats := stat.(type) {
case *inet.StatSNMPIP:
ip := Metrics.IP
*stats = inet.StatSNMPIP{
0, // TODO(gvisor.dev/issue/969): Support Ip/Forwarding.
0, // TODO(gvisor.dev/issue/969): Support Ip/DefaultTTL.
ip.PacketsReceived.Value(), // InReceives.
0, // TODO(gvisor.dev/issue/969): Support Ip/InHdrErrors.
ip.InvalidAddressesReceived.Value(), // InAddrErrors.
0, // TODO(gvisor.dev/issue/969): Support Ip/ForwDatagrams.
0, // TODO(gvisor.dev/issue/969): Support Ip/InUnknownProtos.
0, // TODO(gvisor.dev/issue/969): Support Ip/InDiscards.
ip.PacketsDelivered.Value(), // InDelivers.
ip.PacketsSent.Value(), // OutRequests.
ip.OutgoingPacketErrors.Value(), // OutDiscards.
0, // TODO(gvisor.dev/issue/969): Support Ip/OutNoRoutes.
0, // TODO(gvisor.dev/issue/969): Support Ip/ReasmTimeout.
0, // TODO(gvisor.dev/issue/969): Support Ip/ReasmReqds.
0, // TODO(gvisor.dev/issue/969): Support Ip/ReasmOKs.
0, // TODO(gvisor.dev/issue/969): Support Ip/ReasmFails.
0, // TODO(gvisor.dev/issue/969): Support Ip/FragOKs.
0, // TODO(gvisor.dev/issue/969): Support Ip/FragFails.
0, // TODO(gvisor.dev/issue/969): Support Ip/FragCreates.
}
case *inet.StatSNMPICMP:
in := Metrics.ICMP.V4PacketsReceived.ICMPv4PacketStats
out := Metrics.ICMP.V4PacketsSent.ICMPv4PacketStats
*stats = inet.StatSNMPICMP{
0, // TODO(gvisor.dev/issue/969): Support Icmp/InMsgs.
Metrics.ICMP.V4PacketsSent.Dropped.Value(), // InErrors.
0, // TODO(gvisor.dev/issue/969): Support Icmp/InCsumErrors.
in.DstUnreachable.Value(), // InDestUnreachs.
in.TimeExceeded.Value(), // InTimeExcds.
in.ParamProblem.Value(), // InParmProbs.
in.SrcQuench.Value(), // InSrcQuenchs.
in.Redirect.Value(), // InRedirects.
in.Echo.Value(), // InEchos.
in.EchoReply.Value(), // InEchoReps.
in.Timestamp.Value(), // InTimestamps.
in.TimestampReply.Value(), // InTimestampReps.
in.InfoRequest.Value(), // InAddrMasks.
in.InfoReply.Value(), // InAddrMaskReps.
0, // TODO(gvisor.dev/issue/969): Support Icmp/OutMsgs.
Metrics.ICMP.V4PacketsReceived.Invalid.Value(), // OutErrors.
out.DstUnreachable.Value(), // OutDestUnreachs.
out.TimeExceeded.Value(), // OutTimeExcds.
out.ParamProblem.Value(), // OutParmProbs.
out.SrcQuench.Value(), // OutSrcQuenchs.
out.Redirect.Value(), // OutRedirects.
out.Echo.Value(), // OutEchos.
out.EchoReply.Value(), // OutEchoReps.
out.Timestamp.Value(), // OutTimestamps.
out.TimestampReply.Value(), // OutTimestampReps.
out.InfoRequest.Value(), // OutAddrMasks.
out.InfoReply.Value(), // OutAddrMaskReps.
}
case *inet.StatSNMPTCP:
tcp := Metrics.TCP
// RFC 2012 (updates 1213): SNMPv2-MIB-TCP.
*stats = inet.StatSNMPTCP{
1, // RtoAlgorithm.
200, // RtoMin.
120000, // RtoMax.
(1<<64 - 1), // MaxConn.
tcp.ActiveConnectionOpenings.Value(), // ActiveOpens.
tcp.PassiveConnectionOpenings.Value(), // PassiveOpens.
tcp.FailedConnectionAttempts.Value(), // AttemptFails.
tcp.EstablishedResets.Value(), // EstabResets.
tcp.CurrentEstablished.Value(), // CurrEstab.
tcp.ValidSegmentsReceived.Value(), // InSegs.
tcp.SegmentsSent.Value(), // OutSegs.
tcp.Retransmits.Value(), // RetransSegs.
tcp.InvalidSegmentsReceived.Value(), // InErrs.
tcp.ResetsSent.Value(), // OutRsts.
tcp.ChecksumErrors.Value(), // InCsumErrors.
}
case *inet.StatSNMPUDP:
udp := Metrics.UDP
*stats = inet.StatSNMPUDP{
udp.PacketsReceived.Value(), // InDatagrams.
udp.UnknownPortErrors.Value(), // NoPorts.
0, // TODO(gvisor.dev/issue/969): Support Udp/InErrors.
udp.PacketsSent.Value(), // OutDatagrams.
udp.ReceiveBufferErrors.Value(), // RcvbufErrors.
0, // TODO(gvisor.dev/issue/969): Support Udp/SndbufErrors.
0, // TODO(gvisor.dev/issue/969): Support Udp/InCsumErrors.
0, // TODO(gvisor.dev/issue/969): Support Udp/IgnoredMulti.
}
default:
return syserr.ErrEndpointOperation.ToError()
}
return nil
}
// 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.ID()) {
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
}
routeTable = append(routeTable, inet.Route{
Family: family,
DstLen: uint8(rt.Destination.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.ID()),
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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