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-rw-r--r--pkg/sentry/socket/epsocket/provider.go35
-rw-r--r--pkg/tcpip/network/arp/arp.go4
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go49
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go7
-rw-r--r--pkg/tcpip/stack/registration.go20
-rw-r--r--pkg/tcpip/stack/route.go12
-rw-r--r--pkg/tcpip/stack/stack.go10
-rw-r--r--pkg/tcpip/stack/stack_test.go4
-rw-r--r--pkg/tcpip/transport/raw/BUILD1
-rw-r--r--pkg/tcpip/transport/raw/endpoint.go100
-rw-r--r--pkg/tcpip/transport/raw/protocol.go32
-rw-r--r--test/syscalls/BUILD4
-rw-r--r--test/syscalls/linux/BUILD18
-rw-r--r--test/syscalls/linux/raw_socket_hdrincl.cc408
14 files changed, 666 insertions, 38 deletions
diff --git a/pkg/sentry/socket/epsocket/provider.go b/pkg/sentry/socket/epsocket/provider.go
index 6d2b5d038..421f93dc4 100644
--- a/pkg/sentry/socket/epsocket/provider.go
+++ b/pkg/sentry/socket/epsocket/provider.go
@@ -40,42 +40,49 @@ type provider struct {
}
// getTransportProtocol figures out transport protocol. Currently only TCP,
-// UDP, and ICMP are supported.
-func getTransportProtocol(ctx context.Context, stype linux.SockType, protocol int) (tcpip.TransportProtocolNumber, *syserr.Error) {
+// UDP, and ICMP are supported. The bool return value is true when this socket
+// is associated with a transport protocol. This is only false for SOCK_RAW,
+// IPPROTO_IP sockets.
+func getTransportProtocol(ctx context.Context, stype linux.SockType, protocol int) (tcpip.TransportProtocolNumber, bool, *syserr.Error) {
switch stype {
case linux.SOCK_STREAM:
if protocol != 0 && protocol != syscall.IPPROTO_TCP {
- return 0, syserr.ErrInvalidArgument
+ return 0, true, syserr.ErrInvalidArgument
}
- return tcp.ProtocolNumber, nil
+ return tcp.ProtocolNumber, true, nil
case linux.SOCK_DGRAM:
switch protocol {
case 0, syscall.IPPROTO_UDP:
- return udp.ProtocolNumber, nil
+ return udp.ProtocolNumber, true, nil
case syscall.IPPROTO_ICMP:
- return header.ICMPv4ProtocolNumber, nil
+ return header.ICMPv4ProtocolNumber, true, nil
case syscall.IPPROTO_ICMPV6:
- return header.ICMPv6ProtocolNumber, nil
+ return header.ICMPv6ProtocolNumber, true, nil
}
case linux.SOCK_RAW:
// Raw sockets require CAP_NET_RAW.
creds := auth.CredentialsFromContext(ctx)
if !creds.HasCapability(linux.CAP_NET_RAW) {
- return 0, syserr.ErrPermissionDenied
+ return 0, true, syserr.ErrPermissionDenied
}
switch protocol {
case syscall.IPPROTO_ICMP:
- return header.ICMPv4ProtocolNumber, nil
+ return header.ICMPv4ProtocolNumber, true, nil
case syscall.IPPROTO_UDP:
- return header.UDPProtocolNumber, nil
+ return header.UDPProtocolNumber, true, nil
case syscall.IPPROTO_TCP:
- return header.TCPProtocolNumber, nil
+ return header.TCPProtocolNumber, true, nil
+ // IPPROTO_RAW signifies that the raw socket isn't assigned to
+ // a transport protocol. Users will be able to write packets'
+ // IP headers and won't receive anything.
+ case syscall.IPPROTO_RAW:
+ return tcpip.TransportProtocolNumber(0), false, nil
}
}
- return 0, syserr.ErrProtocolNotSupported
+ return 0, true, syserr.ErrProtocolNotSupported
}
// Socket creates a new socket object for the AF_INET or AF_INET6 family.
@@ -93,7 +100,7 @@ func (p *provider) Socket(t *kernel.Task, stype linux.SockType, protocol int) (*
}
// Figure out the transport protocol.
- transProto, err := getTransportProtocol(t, stype, protocol)
+ transProto, associated, err := getTransportProtocol(t, stype, protocol)
if err != nil {
return nil, err
}
@@ -103,7 +110,7 @@ func (p *provider) Socket(t *kernel.Task, stype linux.SockType, protocol int) (*
var e *tcpip.Error
wq := &waiter.Queue{}
if stype == linux.SOCK_RAW {
- ep, e = eps.Stack.NewRawEndpoint(transProto, p.netProto, wq)
+ ep, e = eps.Stack.NewRawEndpoint(transProto, p.netProto, wq, associated)
} else {
ep, e = eps.Stack.NewEndpoint(transProto, p.netProto, wq)
}
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go
index ca3d6c0bf..cb35635fc 100644
--- a/pkg/tcpip/network/arp/arp.go
+++ b/pkg/tcpip/network/arp/arp.go
@@ -83,6 +83,10 @@ func (e *endpoint) WritePacket(*stack.Route, *stack.GSO, buffer.Prependable, buf
return tcpip.ErrNotSupported
}
+func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.VectorisedView, loop stack.PacketLooping) *tcpip.Error {
+ return tcpip.ErrNotSupported
+}
+
func (e *endpoint) HandlePacket(r *stack.Route, vv buffer.VectorisedView) {
v := vv.First()
h := header.ARP(v)
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 1e3a7425a..e44a73d96 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -232,6 +232,55 @@ func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, hdr buffer.Prepen
return nil
}
+// WriteHeaderIncludedPacket writes a packet already containing a network
+// header through the given route.
+func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.VectorisedView, loop stack.PacketLooping) *tcpip.Error {
+ // The packet already has an IP header, but there are a few required
+ // checks.
+ ip := header.IPv4(payload.First())
+ if !ip.IsValid(payload.Size()) {
+ return tcpip.ErrInvalidOptionValue
+ }
+
+ // Always set the total length.
+ ip.SetTotalLength(uint16(payload.Size()))
+
+ // Set the source address when zero.
+ if ip.SourceAddress() == tcpip.Address(([]byte{0, 0, 0, 0})) {
+ ip.SetSourceAddress(r.LocalAddress)
+ }
+
+ // Set the destination. If the packet already included a destination,
+ // it will be part of the route.
+ ip.SetDestinationAddress(r.RemoteAddress)
+
+ // Set the packet ID when zero.
+ if ip.ID() == 0 {
+ id := uint32(0)
+ if payload.Size() > header.IPv4MaximumHeaderSize+8 {
+ // Packets of 68 bytes or less are required by RFC 791 to not be
+ // fragmented, so we only assign ids to larger packets.
+ id = atomic.AddUint32(&ids[hashRoute(r, 0 /* protocol */)%buckets], 1)
+ }
+ ip.SetID(uint16(id))
+ }
+
+ // Always set the checksum.
+ ip.SetChecksum(0)
+ ip.SetChecksum(^ip.CalculateChecksum())
+
+ if loop&stack.PacketLoop != 0 {
+ e.HandlePacket(r, payload)
+ }
+ if loop&stack.PacketOut == 0 {
+ return nil
+ }
+
+ hdr := buffer.NewPrependableFromView(payload.ToView())
+ r.Stats().IP.PacketsSent.Increment()
+ return e.linkEP.WritePacket(r, nil /* gso */, hdr, buffer.VectorisedView{}, ProtocolNumber)
+}
+
// HandlePacket is called by the link layer when new ipv4 packets arrive for
// this endpoint.
func (e *endpoint) HandlePacket(r *stack.Route, vv buffer.VectorisedView) {
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 27367d6c5..e3e8739fd 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -120,6 +120,13 @@ func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, hdr buffer.Prepen
return e.linkEP.WritePacket(r, gso, hdr, payload, ProtocolNumber)
}
+// WriteHeaderIncludedPacker implements stack.NetworkEndpoint. It is not yet
+// supported by IPv6.
+func (*endpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.VectorisedView, loop stack.PacketLooping) *tcpip.Error {
+ // TODO(b/119580726): Support IPv6 header-included packets.
+ return tcpip.ErrNotSupported
+}
+
// HandlePacket is called by the link layer when new ipv6 packets arrive for
// this endpoint.
func (e *endpoint) HandlePacket(r *stack.Route, vv buffer.VectorisedView) {
diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go
index 0ecaa0833..462265281 100644
--- a/pkg/tcpip/stack/registration.go
+++ b/pkg/tcpip/stack/registration.go
@@ -174,6 +174,10 @@ type NetworkEndpoint interface {
// protocol.
WritePacket(r *Route, gso *GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.TransportProtocolNumber, ttl uint8, loop PacketLooping) *tcpip.Error
+ // WriteHeaderIncludedPacket writes a packet that includes a network
+ // header to the given destination address.
+ WriteHeaderIncludedPacket(r *Route, payload buffer.VectorisedView, loop PacketLooping) *tcpip.Error
+
// ID returns the network protocol endpoint ID.
ID() *NetworkEndpointID
@@ -357,10 +361,19 @@ type TransportProtocolFactory func() TransportProtocol
// instantiate network protocols.
type NetworkProtocolFactory func() NetworkProtocol
+// UnassociatedEndpointFactory produces endpoints for writing packets not
+// associated with a particular transport protocol. Such endpoints can be used
+// to write arbitrary packets that include the IP header.
+type UnassociatedEndpointFactory interface {
+ NewUnassociatedRawEndpoint(stack *Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error)
+}
+
var (
transportProtocols = make(map[string]TransportProtocolFactory)
networkProtocols = make(map[string]NetworkProtocolFactory)
+ unassociatedFactory UnassociatedEndpointFactory
+
linkEPMu sync.RWMutex
nextLinkEndpointID tcpip.LinkEndpointID = 1
linkEndpoints = make(map[tcpip.LinkEndpointID]LinkEndpoint)
@@ -380,6 +393,13 @@ func RegisterNetworkProtocolFactory(name string, p NetworkProtocolFactory) {
networkProtocols[name] = p
}
+// RegisterUnassociatedFactory registers a factory to produce endpoints not
+// associated with any particular transport protocol. This function is intended
+// to be called by init() functions of the protocols.
+func RegisterUnassociatedFactory(f UnassociatedEndpointFactory) {
+ unassociatedFactory = f
+}
+
// RegisterLinkEndpoint register a link-layer protocol endpoint and returns an
// ID that can be used to refer to it.
func RegisterLinkEndpoint(linkEP LinkEndpoint) tcpip.LinkEndpointID {
diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go
index 36d7b6ac7..391ab4344 100644
--- a/pkg/tcpip/stack/route.go
+++ b/pkg/tcpip/stack/route.go
@@ -163,6 +163,18 @@ func (r *Route) WritePacket(gso *GSO, hdr buffer.Prependable, payload buffer.Vec
return err
}
+// WriteHeaderIncludedPacket writes a packet already containing a network
+// header through the given route.
+func (r *Route) WriteHeaderIncludedPacket(payload buffer.VectorisedView) *tcpip.Error {
+ if err := r.ref.ep.WriteHeaderIncludedPacket(r, payload, r.loop); err != nil {
+ r.Stats().IP.OutgoingPacketErrors.Increment()
+ return err
+ }
+ r.ref.nic.stats.Tx.Packets.Increment()
+ r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(payload.Size()))
+ return nil
+}
+
// DefaultTTL returns the default TTL of the underlying network endpoint.
func (r *Route) DefaultTTL() uint8 {
return r.ref.ep.DefaultTTL()
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 2d7f56ca9..3e8fb2a6c 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -340,6 +340,8 @@ type Stack struct {
networkProtocols map[tcpip.NetworkProtocolNumber]NetworkProtocol
linkAddrResolvers map[tcpip.NetworkProtocolNumber]LinkAddressResolver
+ unassociatedFactory UnassociatedEndpointFactory
+
demux *transportDemuxer
stats tcpip.Stats
@@ -442,6 +444,8 @@ func New(network []string, transport []string, opts Options) *Stack {
}
}
+ s.unassociatedFactory = unassociatedFactory
+
// Create the global transport demuxer.
s.demux = newTransportDemuxer(s)
@@ -574,11 +578,15 @@ func (s *Stack) NewEndpoint(transport tcpip.TransportProtocolNumber, network tcp
// NewRawEndpoint creates a new raw transport layer endpoint of the given
// protocol. Raw endpoints receive all traffic for a given protocol regardless
// of address.
-func (s *Stack) NewRawEndpoint(transport tcpip.TransportProtocolNumber, network tcpip.NetworkProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
+func (s *Stack) NewRawEndpoint(transport tcpip.TransportProtocolNumber, network tcpip.NetworkProtocolNumber, waiterQueue *waiter.Queue, associated bool) (tcpip.Endpoint, *tcpip.Error) {
if !s.raw {
return nil, tcpip.ErrNotPermitted
}
+ if !associated {
+ return s.unassociatedFactory.NewUnassociatedRawEndpoint(s, network, transport, waiterQueue)
+ }
+
t, ok := s.transportProtocols[transport]
if !ok {
return nil, tcpip.ErrUnknownProtocol
diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go
index 69884af03..959071dbe 100644
--- a/pkg/tcpip/stack/stack_test.go
+++ b/pkg/tcpip/stack/stack_test.go
@@ -137,6 +137,10 @@ func (f *fakeNetworkEndpoint) WritePacket(r *stack.Route, gso *stack.GSO, hdr bu
return f.linkEP.WritePacket(r, gso, hdr, payload, fakeNetNumber)
}
+func (*fakeNetworkEndpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.VectorisedView, loop stack.PacketLooping) *tcpip.Error {
+ return tcpip.ErrNotSupported
+}
+
func (*fakeNetworkEndpoint) Close() {}
type fakeNetGoodOption bool
diff --git a/pkg/tcpip/transport/raw/BUILD b/pkg/tcpip/transport/raw/BUILD
index 34a14bf7f..bc4b255b4 100644
--- a/pkg/tcpip/transport/raw/BUILD
+++ b/pkg/tcpip/transport/raw/BUILD
@@ -21,6 +21,7 @@ go_library(
"endpoint.go",
"endpoint_state.go",
"packet_list.go",
+ "protocol.go",
],
importpath = "gvisor.dev/gvisor/pkg/tcpip/transport/raw",
imports = ["gvisor.dev/gvisor/pkg/tcpip/buffer"],
diff --git a/pkg/tcpip/transport/raw/endpoint.go b/pkg/tcpip/transport/raw/endpoint.go
index 42aded77f..a29587658 100644
--- a/pkg/tcpip/transport/raw/endpoint.go
+++ b/pkg/tcpip/transport/raw/endpoint.go
@@ -67,6 +67,7 @@ type endpoint struct {
netProto tcpip.NetworkProtocolNumber
transProto tcpip.TransportProtocolNumber
waiterQueue *waiter.Queue
+ associated bool
// The following fields are used to manage the receive queue and are
// protected by rcvMu.
@@ -97,8 +98,12 @@ type endpoint struct {
}
// NewEndpoint returns a raw endpoint for the given protocols.
-// TODO(b/129292371): IP_HDRINCL, IPPROTO_RAW, and AF_PACKET.
+// TODO(b/129292371): IP_HDRINCL and AF_PACKET.
func NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
+ return newEndpoint(stack, netProto, transProto, waiterQueue, true /* associated */)
+}
+
+func newEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue, associated bool) (tcpip.Endpoint, *tcpip.Error) {
if netProto != header.IPv4ProtocolNumber {
return nil, tcpip.ErrUnknownProtocol
}
@@ -110,6 +115,16 @@ func NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, trans
waiterQueue: waiterQueue,
rcvBufSizeMax: 32 * 1024,
sndBufSize: 32 * 1024,
+ associated: associated,
+ }
+
+ // Unassociated endpoints are write-only and users call Write() with IP
+ // headers included. Because they're write-only, We don't need to
+ // register with the stack.
+ if !associated {
+ ep.rcvBufSizeMax = 0
+ ep.waiterQueue = nil
+ return ep, nil
}
if err := ep.stack.RegisterRawTransportEndpoint(ep.registeredNIC, ep.netProto, ep.transProto, ep); err != nil {
@@ -124,7 +139,7 @@ func (ep *endpoint) Close() {
ep.mu.Lock()
defer ep.mu.Unlock()
- if ep.closed {
+ if ep.closed || !ep.associated {
return
}
@@ -142,8 +157,11 @@ func (ep *endpoint) Close() {
if ep.connected {
ep.route.Release()
+ ep.connected = false
}
+ ep.closed = true
+
ep.waiterQueue.Notify(waiter.EventHUp | waiter.EventErr | waiter.EventIn | waiter.EventOut)
}
@@ -152,6 +170,10 @@ func (ep *endpoint) ModerateRecvBuf(copied int) {}
// Read implements tcpip.Endpoint.Read.
func (ep *endpoint) Read(addr *tcpip.FullAddress) (buffer.View, tcpip.ControlMessages, *tcpip.Error) {
+ if !ep.associated {
+ return buffer.View{}, tcpip.ControlMessages{}, tcpip.ErrInvalidOptionValue
+ }
+
ep.rcvMu.Lock()
// If there's no data to read, return that read would block or that the
@@ -192,6 +214,33 @@ func (ep *endpoint) Write(payload tcpip.Payload, opts tcpip.WriteOptions) (uintp
return 0, nil, tcpip.ErrInvalidEndpointState
}
+ payloadBytes, err := payload.Get(payload.Size())
+ if err != nil {
+ ep.mu.RUnlock()
+ return 0, nil, err
+ }
+
+ // If this is an unassociated socket and callee provided a nonzero
+ // destination address, route using that address.
+ if !ep.associated {
+ ip := header.IPv4(payloadBytes)
+ if !ip.IsValid(payload.Size()) {
+ ep.mu.RUnlock()
+ return 0, nil, tcpip.ErrInvalidOptionValue
+ }
+ dstAddr := ip.DestinationAddress()
+ // Update dstAddr with the address in the IP header, unless
+ // opts.To is set (e.g. if sendto specifies a specific
+ // address).
+ if dstAddr != tcpip.Address([]byte{0, 0, 0, 0}) && opts.To == nil {
+ opts.To = &tcpip.FullAddress{
+ NIC: 0, // NIC is unset.
+ Addr: dstAddr, // The address from the payload.
+ Port: 0, // There are no ports here.
+ }
+ }
+ }
+
// Did the user caller provide a destination? If not, use the connected
// destination.
if opts.To == nil {
@@ -216,12 +265,12 @@ func (ep *endpoint) Write(payload tcpip.Payload, opts tcpip.WriteOptions) (uintp
return 0, nil, tcpip.ErrInvalidEndpointState
}
- n, ch, err := ep.finishWrite(payload, savedRoute)
+ n, ch, err := ep.finishWrite(payloadBytes, savedRoute)
ep.mu.Unlock()
return n, ch, err
}
- n, ch, err := ep.finishWrite(payload, &ep.route)
+ n, ch, err := ep.finishWrite(payloadBytes, &ep.route)
ep.mu.RUnlock()
return n, ch, err
}
@@ -248,7 +297,7 @@ func (ep *endpoint) Write(payload tcpip.Payload, opts tcpip.WriteOptions) (uintp
return 0, nil, err
}
- n, ch, err := ep.finishWrite(payload, &route)
+ n, ch, err := ep.finishWrite(payloadBytes, &route)
route.Release()
ep.mu.RUnlock()
return n, ch, err
@@ -256,7 +305,7 @@ func (ep *endpoint) Write(payload tcpip.Payload, opts tcpip.WriteOptions) (uintp
// finishWrite writes the payload to a route. It resolves the route if
// necessary. It's really just a helper to make defer unnecessary in Write.
-func (ep *endpoint) finishWrite(payload tcpip.Payload, route *stack.Route) (uintptr, <-chan struct{}, *tcpip.Error) {
+func (ep *endpoint) finishWrite(payloadBytes []byte, route *stack.Route) (uintptr, <-chan struct{}, *tcpip.Error) {
// We may need to resolve the route (match a link layer address to the
// network address). If that requires blocking (e.g. to use ARP),
// return a channel on which the caller can wait.
@@ -269,13 +318,14 @@ func (ep *endpoint) finishWrite(payload tcpip.Payload, route *stack.Route) (uint
}
}
- payloadBytes, err := payload.Get(payload.Size())
- if err != nil {
- return 0, nil, err
- }
-
switch ep.netProto {
case header.IPv4ProtocolNumber:
+ if !ep.associated {
+ if err := route.WriteHeaderIncludedPacket(buffer.View(payloadBytes).ToVectorisedView()); err != nil {
+ return 0, nil, err
+ }
+ break
+ }
hdr := buffer.NewPrependable(len(payloadBytes) + int(route.MaxHeaderLength()))
if err := route.WritePacket(nil /* gso */, hdr, buffer.View(payloadBytes).ToVectorisedView(), ep.transProto, route.DefaultTTL()); err != nil {
return 0, nil, err
@@ -335,15 +385,17 @@ func (ep *endpoint) Connect(addr tcpip.FullAddress) *tcpip.Error {
}
defer route.Release()
- // Re-register the endpoint with the appropriate NIC.
- if err := ep.stack.RegisterRawTransportEndpoint(addr.NIC, ep.netProto, ep.transProto, ep); err != nil {
- return err
+ if ep.associated {
+ // Re-register the endpoint with the appropriate NIC.
+ if err := ep.stack.RegisterRawTransportEndpoint(addr.NIC, ep.netProto, ep.transProto, ep); err != nil {
+ return err
+ }
+ ep.stack.UnregisterRawTransportEndpoint(ep.registeredNIC, ep.netProto, ep.transProto, ep)
+ ep.registeredNIC = nic
}
- ep.stack.UnregisterRawTransportEndpoint(ep.registeredNIC, ep.netProto, ep.transProto, ep)
- // Save the route and NIC we've connected via.
+ // Save the route we've connected via.
ep.route = route.Clone()
- ep.registeredNIC = nic
ep.connected = true
return nil
@@ -386,14 +438,16 @@ func (ep *endpoint) Bind(addr tcpip.FullAddress) *tcpip.Error {
return tcpip.ErrBadLocalAddress
}
- // Re-register the endpoint with the appropriate NIC.
- if err := ep.stack.RegisterRawTransportEndpoint(addr.NIC, ep.netProto, ep.transProto, ep); err != nil {
- return err
+ if ep.associated {
+ // Re-register the endpoint with the appropriate NIC.
+ if err := ep.stack.RegisterRawTransportEndpoint(addr.NIC, ep.netProto, ep.transProto, ep); err != nil {
+ return err
+ }
+ ep.stack.UnregisterRawTransportEndpoint(ep.registeredNIC, ep.netProto, ep.transProto, ep)
+ ep.registeredNIC = addr.NIC
+ ep.boundNIC = addr.NIC
}
- ep.stack.UnregisterRawTransportEndpoint(ep.registeredNIC, ep.netProto, ep.transProto, ep)
- ep.registeredNIC = addr.NIC
- ep.boundNIC = addr.NIC
ep.boundAddr = addr.Addr
ep.bound = true
diff --git a/pkg/tcpip/transport/raw/protocol.go b/pkg/tcpip/transport/raw/protocol.go
new file mode 100644
index 000000000..783c21e6b
--- /dev/null
+++ b/pkg/tcpip/transport/raw/protocol.go
@@ -0,0 +1,32 @@
+// Copyright 2019 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 raw
+
+import (
+ "gvisor.dev/gvisor/pkg/tcpip"
+ "gvisor.dev/gvisor/pkg/tcpip/stack"
+ "gvisor.dev/gvisor/pkg/waiter"
+)
+
+type factory struct{}
+
+// NewUnassociatedRawEndpoint implements stack.UnassociatedEndpointFactory.
+func (factory) NewUnassociatedRawEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
+ return newEndpoint(stack, netProto, transProto, waiterQueue, false /* associated */)
+}
+
+func init() {
+ stack.RegisterUnassociatedFactory(factory{})
+}
diff --git a/test/syscalls/BUILD b/test/syscalls/BUILD
index 4ac511740..c54d90a1c 100644
--- a/test/syscalls/BUILD
+++ b/test/syscalls/BUILD
@@ -319,6 +319,10 @@ syscall_test(
test = "//test/syscalls/linux:pwrite64_test",
)
+syscall_test(test = "//test/syscalls/linux:raw_socket_hdrincl_test")
+
+syscall_test(test = "//test/syscalls/linux:raw_socket_icmp_test")
+
syscall_test(test = "//test/syscalls/linux:raw_socket_ipv4_test")
syscall_test(
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index 4735284ba..c5a368463 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -1562,6 +1562,24 @@ cc_binary(
)
cc_binary(
+ name = "raw_socket_hdrincl_test",
+ testonly = 1,
+ srcs = ["raw_socket_hdrincl.cc"],
+ linkstatic = 1,
+ deps = [
+ ":socket_test_util",
+ ":unix_domain_socket_test_util",
+ "//test/util:capability_util",
+ "//test/util:file_descriptor",
+ "//test/util:test_main",
+ "//test/util:test_util",
+ "@com_google_absl//absl/base:core_headers",
+ "@com_google_absl//absl/base:endian",
+ "@com_google_googletest//:gtest",
+ ],
+)
+
+cc_binary(
name = "raw_socket_ipv4_test",
testonly = 1,
srcs = ["raw_socket_ipv4.cc"],
diff --git a/test/syscalls/linux/raw_socket_hdrincl.cc b/test/syscalls/linux/raw_socket_hdrincl.cc
new file mode 100644
index 000000000..a070817eb
--- /dev/null
+++ b/test/syscalls/linux/raw_socket_hdrincl.cc
@@ -0,0 +1,408 @@
+// Copyright 2019 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.
+
+#include <linux/capability.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/udp.h>
+#include <poll.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <cstring>
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/endian.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/syscalls/linux/unix_domain_socket_test_util.h"
+#include "test/util/capability_util.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+// Tests for IPPROTO_RAW raw sockets, which implies IP_HDRINCL.
+class RawHDRINCL : public ::testing::Test {
+ protected:
+ // Creates a socket to be used in tests.
+ void SetUp() override;
+
+ // Closes the socket created by SetUp().
+ void TearDown() override;
+
+ // Returns a valid looback IP header with no payload.
+ struct iphdr LoopbackHeader();
+
+ // Fills in buf with an IP header, UDP header, and payload. Returns false if
+ // buf_size isn't large enough to hold everything.
+ bool FillPacket(char* buf, size_t buf_size, int port, const char* payload,
+ uint16_t payload_size);
+
+ // The socket used for both reading and writing.
+ int socket_;
+
+ // The loopback address.
+ struct sockaddr_in addr_;
+};
+
+void RawHDRINCL::SetUp() {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(socket_ = socket(AF_INET, SOCK_RAW, IPPROTO_RAW),
+ SyscallSucceeds());
+
+ addr_ = {};
+
+ addr_.sin_port = IPPROTO_IP;
+ addr_.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ addr_.sin_family = AF_INET;
+}
+
+void RawHDRINCL::TearDown() {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ EXPECT_THAT(close(socket_), SyscallSucceeds());
+}
+
+struct iphdr RawHDRINCL::LoopbackHeader() {
+ struct iphdr hdr = {};
+ hdr.ihl = 5;
+ hdr.version = 4;
+ hdr.tos = 0;
+ hdr.tot_len = absl::gbswap_16(sizeof(hdr));
+ hdr.id = 0;
+ hdr.frag_off = 0;
+ hdr.ttl = 7;
+ hdr.protocol = 1;
+ hdr.daddr = htonl(INADDR_LOOPBACK);
+ // hdr.check is set by the network stack.
+ // hdr.tot_len is set by the network stack.
+ // hdr.saddr is set by the network stack.
+ return hdr;
+}
+
+bool RawHDRINCL::FillPacket(char* buf, size_t buf_size, int port,
+ const char* payload, uint16_t payload_size) {
+ if (buf_size < sizeof(struct iphdr) + sizeof(struct udphdr) + payload_size) {
+ return false;
+ }
+
+ struct iphdr ip = LoopbackHeader();
+ ip.protocol = IPPROTO_UDP;
+
+ struct udphdr udp = {};
+ udp.source = absl::gbswap_16(port);
+ udp.dest = absl::gbswap_16(port);
+ udp.len = absl::gbswap_16(sizeof(udp) + payload_size);
+ udp.check = 0;
+
+ memcpy(buf, reinterpret_cast<char*>(&ip), sizeof(ip));
+ memcpy(buf + sizeof(ip), reinterpret_cast<char*>(&udp), sizeof(udp));
+ memcpy(buf + sizeof(ip) + sizeof(udp), payload, payload_size);
+
+ return true;
+}
+
+// We should be able to create multiple IPPROTO_RAW sockets. RawHDRINCL::Setup
+// creates the first one, so we only have to create one more here.
+TEST_F(RawHDRINCL, MultipleCreation) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ int s2;
+ ASSERT_THAT(s2 = socket(AF_INET, SOCK_RAW, IPPROTO_RAW), SyscallSucceeds());
+
+ ASSERT_THAT(close(s2), SyscallSucceeds());
+}
+
+// Test that shutting down an unconnected socket fails.
+TEST_F(RawHDRINCL, FailShutdownWithoutConnect) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(shutdown(socket_, SHUT_WR), SyscallFailsWithErrno(ENOTCONN));
+ ASSERT_THAT(shutdown(socket_, SHUT_RD), SyscallFailsWithErrno(ENOTCONN));
+}
+
+// Test that listen() fails.
+TEST_F(RawHDRINCL, FailListen) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(listen(socket_, 1), SyscallFailsWithErrno(ENOTSUP));
+}
+
+// Test that accept() fails.
+TEST_F(RawHDRINCL, FailAccept) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ struct sockaddr saddr;
+ socklen_t addrlen;
+ ASSERT_THAT(accept(socket_, &saddr, &addrlen),
+ SyscallFailsWithErrno(ENOTSUP));
+}
+
+// Test that the socket is writable immediately.
+TEST_F(RawHDRINCL, PollWritableImmediately) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ struct pollfd pfd = {};
+ pfd.fd = socket_;
+ pfd.events = POLLOUT;
+ ASSERT_THAT(RetryEINTR(poll)(&pfd, 1, 0), SyscallSucceedsWithValue(1));
+}
+
+// Test that the socket isn't readable.
+TEST_F(RawHDRINCL, NotReadable) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ // Try to receive data with MSG_DONTWAIT, which returns immediately if there's
+ // nothing to be read.
+ char buf[117];
+ ASSERT_THAT(RetryEINTR(recv)(socket_, buf, sizeof(buf), MSG_DONTWAIT),
+ SyscallFailsWithErrno(EINVAL));
+}
+
+// Test that we can connect() to a valid IP (loopback).
+TEST_F(RawHDRINCL, ConnectToLoopback) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(connect(socket_, reinterpret_cast<struct sockaddr*>(&addr_),
+ sizeof(addr_)),
+ SyscallSucceeds());
+}
+
+TEST_F(RawHDRINCL, SendWithoutConnectSucceeds) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ struct iphdr hdr = LoopbackHeader();
+ ASSERT_THAT(send(socket_, &hdr, sizeof(hdr), 0),
+ SyscallSucceedsWithValue(sizeof(hdr)));
+}
+
+// HDRINCL implies write-only. Verify that we can't read a packet sent to
+// loopback.
+TEST_F(RawHDRINCL, NotReadableAfterWrite) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(connect(socket_, reinterpret_cast<struct sockaddr*>(&addr_),
+ sizeof(addr_)),
+ SyscallSucceeds());
+
+ // Construct a packet with an IP header, UDP header, and payload.
+ constexpr char kPayload[] = "odst";
+ char packet[sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kPayload)];
+ ASSERT_TRUE(FillPacket(packet, sizeof(packet), 40000 /* port */, kPayload,
+ sizeof(kPayload)));
+
+ socklen_t addrlen = sizeof(addr_);
+ ASSERT_NO_FATAL_FAILURE(
+ sendto(socket_, reinterpret_cast<void*>(&packet), sizeof(packet), 0,
+ reinterpret_cast<struct sockaddr*>(&addr_), addrlen));
+
+ struct pollfd pfd = {};
+ pfd.fd = socket_;
+ pfd.events = POLLIN;
+ ASSERT_THAT(RetryEINTR(poll)(&pfd, 1, 1000), SyscallSucceedsWithValue(0));
+}
+
+TEST_F(RawHDRINCL, WriteTooSmall) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(connect(socket_, reinterpret_cast<struct sockaddr*>(&addr_),
+ sizeof(addr_)),
+ SyscallSucceeds());
+
+ // This is smaller than the size of an IP header.
+ constexpr char kBuf[] = "JP5";
+ ASSERT_THAT(send(socket_, kBuf, sizeof(kBuf), 0),
+ SyscallFailsWithErrno(EINVAL));
+}
+
+// Bind to localhost.
+TEST_F(RawHDRINCL, BindToLocalhost) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ ASSERT_THAT(
+ bind(socket_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_)),
+ SyscallSucceeds());
+}
+
+// Bind to a different address.
+TEST_F(RawHDRINCL, BindToInvalid) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ struct sockaddr_in bind_addr = {};
+ bind_addr.sin_family = AF_INET;
+ bind_addr.sin_addr = {1}; // 1.0.0.0 - An address that we can't bind to.
+ ASSERT_THAT(bind(socket_, reinterpret_cast<struct sockaddr*>(&bind_addr),
+ sizeof(bind_addr)),
+ SyscallFailsWithErrno(EADDRNOTAVAIL));
+}
+
+// Send and receive a packet.
+TEST_F(RawHDRINCL, SendAndReceive) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ int port = 40000;
+ if (!IsRunningOnGvisor()) {
+ port = static_cast<short>(ASSERT_NO_ERRNO_AND_VALUE(
+ PortAvailable(0, AddressFamily::kIpv4, SocketType::kUdp, false)));
+ }
+
+ // IPPROTO_RAW sockets are write-only. We'll have to open another socket to
+ // read what we write.
+ FileDescriptor udp_sock =
+ ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_UDP));
+
+ // Construct a packet with an IP header, UDP header, and payload.
+ constexpr char kPayload[] = "toto";
+ char packet[sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kPayload)];
+ ASSERT_TRUE(
+ FillPacket(packet, sizeof(packet), port, kPayload, sizeof(kPayload)));
+
+ socklen_t addrlen = sizeof(addr_);
+ ASSERT_NO_FATAL_FAILURE(sendto(socket_, &packet, sizeof(packet), 0,
+ reinterpret_cast<struct sockaddr*>(&addr_),
+ addrlen));
+
+ // Receive the payload.
+ char recv_buf[sizeof(packet)];
+ struct sockaddr_in src;
+ socklen_t src_size = sizeof(src);
+ ASSERT_THAT(recvfrom(udp_sock.get(), recv_buf, sizeof(recv_buf), 0,
+ reinterpret_cast<struct sockaddr*>(&src), &src_size),
+ SyscallSucceedsWithValue(sizeof(packet)));
+ EXPECT_EQ(
+ memcmp(kPayload, recv_buf + sizeof(struct iphdr) + sizeof(struct udphdr),
+ sizeof(kPayload)),
+ 0);
+ // The network stack should have set the source address.
+ EXPECT_EQ(src.sin_family, AF_INET);
+ EXPECT_EQ(absl::gbswap_32(src.sin_addr.s_addr), INADDR_LOOPBACK);
+ // The packet ID should be 0, as the packet is less than 68 bytes.
+ struct iphdr iphdr = {};
+ memcpy(&iphdr, recv_buf, sizeof(iphdr));
+ EXPECT_EQ(iphdr.id, 0);
+}
+
+// Send and receive a packet with nonzero IP ID.
+TEST_F(RawHDRINCL, SendAndReceiveNonzeroID) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ int port = 40000;
+ if (!IsRunningOnGvisor()) {
+ port = static_cast<short>(ASSERT_NO_ERRNO_AND_VALUE(
+ PortAvailable(0, AddressFamily::kIpv4, SocketType::kUdp, false)));
+ }
+
+ // IPPROTO_RAW sockets are write-only. We'll have to open another socket to
+ // read what we write.
+ FileDescriptor udp_sock =
+ ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_UDP));
+
+ // Construct a packet with an IP header, UDP header, and payload. Make the
+ // payload large enough to force an IP ID to be assigned.
+ constexpr char kPayload[128] = {};
+ char packet[sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kPayload)];
+ ASSERT_TRUE(
+ FillPacket(packet, sizeof(packet), port, kPayload, sizeof(kPayload)));
+
+ socklen_t addrlen = sizeof(addr_);
+ ASSERT_NO_FATAL_FAILURE(sendto(socket_, &packet, sizeof(packet), 0,
+ reinterpret_cast<struct sockaddr*>(&addr_),
+ addrlen));
+
+ // Receive the payload.
+ char recv_buf[sizeof(packet)];
+ struct sockaddr_in src;
+ socklen_t src_size = sizeof(src);
+ ASSERT_THAT(recvfrom(udp_sock.get(), recv_buf, sizeof(recv_buf), 0,
+ reinterpret_cast<struct sockaddr*>(&src), &src_size),
+ SyscallSucceedsWithValue(sizeof(packet)));
+ EXPECT_EQ(
+ memcmp(kPayload, recv_buf + sizeof(struct iphdr) + sizeof(struct udphdr),
+ sizeof(kPayload)),
+ 0);
+ // The network stack should have set the source address.
+ EXPECT_EQ(src.sin_family, AF_INET);
+ EXPECT_EQ(absl::gbswap_32(src.sin_addr.s_addr), INADDR_LOOPBACK);
+ // The packet ID should not be 0, as the packet was more than 68 bytes.
+ struct iphdr* iphdr = reinterpret_cast<struct iphdr*>(recv_buf);
+ EXPECT_NE(iphdr->id, 0);
+}
+
+// Send and receive a packet where the sendto address is not the same as the
+// provided destination.
+TEST_F(RawHDRINCL, SendAndReceiveDifferentAddress) {
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
+
+ int port = 40000;
+ if (!IsRunningOnGvisor()) {
+ port = static_cast<short>(ASSERT_NO_ERRNO_AND_VALUE(
+ PortAvailable(0, AddressFamily::kIpv4, SocketType::kUdp, false)));
+ }
+
+ // IPPROTO_RAW sockets are write-only. We'll have to open another socket to
+ // read what we write.
+ FileDescriptor udp_sock =
+ ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_RAW, IPPROTO_UDP));
+
+ // Construct a packet with an IP header, UDP header, and payload.
+ constexpr char kPayload[] = "toto";
+ char packet[sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(kPayload)];
+ ASSERT_TRUE(
+ FillPacket(packet, sizeof(packet), port, kPayload, sizeof(kPayload)));
+ // Overwrite the IP destination address with an IP we can't get to.
+ struct iphdr iphdr = {};
+ memcpy(&iphdr, packet, sizeof(iphdr));
+ iphdr.daddr = 42;
+ memcpy(packet, &iphdr, sizeof(iphdr));
+
+ socklen_t addrlen = sizeof(addr_);
+ ASSERT_NO_FATAL_FAILURE(sendto(socket_, &packet, sizeof(packet), 0,
+ reinterpret_cast<struct sockaddr*>(&addr_),
+ addrlen));
+
+ // Receive the payload, since sendto should replace the bad destination with
+ // localhost.
+ char recv_buf[sizeof(packet)];
+ struct sockaddr_in src;
+ socklen_t src_size = sizeof(src);
+ ASSERT_THAT(recvfrom(udp_sock.get(), recv_buf, sizeof(recv_buf), 0,
+ reinterpret_cast<struct sockaddr*>(&src), &src_size),
+ SyscallSucceedsWithValue(sizeof(packet)));
+ EXPECT_EQ(
+ memcmp(kPayload, recv_buf + sizeof(struct iphdr) + sizeof(struct udphdr),
+ sizeof(kPayload)),
+ 0);
+ // The network stack should have set the source address.
+ EXPECT_EQ(src.sin_family, AF_INET);
+ EXPECT_EQ(absl::gbswap_32(src.sin_addr.s_addr), INADDR_LOOPBACK);
+ // The packet ID should be 0, as the packet is less than 68 bytes.
+ struct iphdr recv_iphdr = {};
+ memcpy(&recv_iphdr, recv_buf, sizeof(recv_iphdr));
+ EXPECT_EQ(recv_iphdr.id, 0);
+ // The destination address should be localhost, not the bad IP we set
+ // initially.
+ EXPECT_EQ(absl::gbswap_32(recv_iphdr.daddr), INADDR_LOOPBACK);
+}
+
+} // namespace
+
+} // namespace testing
+} // namespace gvisor
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 03:20:16 +0000