1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
// 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()
}
// RegisteredEndpoints implements inet.Stack.RegisteredEndpoints.
func (s *Stack) RegisteredEndpoints() []stack.TransportEndpoint {
return s.Stack.RegisteredEndpoints()
}
// CleanupEndpoints implements inet.Stack.CleanupEndpoints.
func (s *Stack) CleanupEndpoints() []stack.TransportEndpoint {
return s.Stack.CleanupEndpoints()
}
// RestoreCleanupEndpoints implements inet.Stack.RestoreCleanupEndpoints.
func (s *Stack) RestoreCleanupEndpoints(es []stack.TransportEndpoint) {
s.Stack.RestoreCleanupEndpoints(es)
}
|
