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-rw-r--r--pkg/sentry/devices/tundev/tundev.go14
-rw-r--r--pkg/sentry/fs/dev/net_tun.go52
-rw-r--r--pkg/tcpip/header/eth.go16
-rw-r--r--pkg/tcpip/link/tun/device.go42
-rw-r--r--pkg/tcpip/network/arp/arp.go25
-rw-r--r--pkg/tcpip/network/ipv4/icmp.go40
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go32
-rw-r--r--pkg/tcpip/network/ipv6/icmp.go51
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go42
-rw-r--r--pkg/tcpip/network/ipv6/ndp.go2
-rw-r--r--pkg/tcpip/stack/neighbor_entry.go4
-rw-r--r--pkg/tcpip/stack/nic.go125
-rw-r--r--pkg/tcpip/stack/pending_packets.go (renamed from pkg/tcpip/stack/forwarder.go)60
-rw-r--r--pkg/tcpip/stack/registration.go33
-rw-r--r--pkg/tcpip/stack/route.go50
-rw-r--r--pkg/tcpip/stack/stack.go42
16 files changed, 346 insertions, 284 deletions
diff --git a/pkg/sentry/devices/tundev/tundev.go b/pkg/sentry/devices/tundev/tundev.go
index 0b701a289..655ea549b 100644
--- a/pkg/sentry/devices/tundev/tundev.go
+++ b/pkg/sentry/devices/tundev/tundev.go
@@ -16,6 +16,8 @@
package tundev
import (
+ "fmt"
+
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/arch"
@@ -26,6 +28,7 @@ import (
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/tcpip/link/tun"
+ "gvisor.dev/gvisor/pkg/tcpip/network/arp"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
@@ -84,7 +87,16 @@ func (fd *tunFD) Ioctl(ctx context.Context, uio usermem.IO, args arch.SyscallArg
return 0, err
}
flags := usermem.ByteOrder.Uint16(req.Data[:])
- return 0, fd.device.SetIff(stack.Stack, req.Name(), flags)
+ created, err := fd.device.SetIff(stack.Stack, req.Name(), flags)
+ if err == nil && created {
+ // Always start with an ARP address for interfaces so they can handle ARP
+ // packets.
+ nicID := fd.device.NICID()
+ if err := stack.Stack.AddAddress(nicID, arp.ProtocolNumber, arp.ProtocolAddress); err != nil {
+ panic(fmt.Sprintf("failed to add ARP address after creating new TUN/TAP interface with ID = %d", nicID))
+ }
+ }
+ return 0, err
case linux.TUNGETIFF:
var req linux.IFReq
diff --git a/pkg/sentry/fs/dev/net_tun.go b/pkg/sentry/fs/dev/net_tun.go
index 5f8c9b5a2..19ffdec47 100644
--- a/pkg/sentry/fs/dev/net_tun.go
+++ b/pkg/sentry/fs/dev/net_tun.go
@@ -15,6 +15,8 @@
package dev
import (
+ "fmt"
+
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/arch"
@@ -25,6 +27,7 @@ import (
"gvisor.dev/gvisor/pkg/sentry/socket/netstack"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/tcpip/link/tun"
+ "gvisor.dev/gvisor/pkg/tcpip/network/arp"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
@@ -60,7 +63,7 @@ func newNetTunDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMod
}
// GetFile implements fs.InodeOperations.GetFile.
-func (iops *netTunInodeOperations) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
+func (*netTunInodeOperations) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
return fs.NewFile(ctx, d, flags, &netTunFileOperations{}), nil
}
@@ -80,12 +83,12 @@ type netTunFileOperations struct {
var _ fs.FileOperations = (*netTunFileOperations)(nil)
// Release implements fs.FileOperations.Release.
-func (fops *netTunFileOperations) Release(ctx context.Context) {
- fops.device.Release(ctx)
+func (n *netTunFileOperations) Release(ctx context.Context) {
+ n.device.Release(ctx)
}
// Ioctl implements fs.FileOperations.Ioctl.
-func (fops *netTunFileOperations) Ioctl(ctx context.Context, file *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
+func (n *netTunFileOperations) Ioctl(ctx context.Context, file *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
request := args[1].Uint()
data := args[2].Pointer()
@@ -109,16 +112,25 @@ func (fops *netTunFileOperations) Ioctl(ctx context.Context, file *fs.File, io u
return 0, err
}
flags := usermem.ByteOrder.Uint16(req.Data[:])
- return 0, fops.device.SetIff(stack.Stack, req.Name(), flags)
+ created, err := n.device.SetIff(stack.Stack, req.Name(), flags)
+ if err == nil && created {
+ // Always start with an ARP address for interfaces so they can handle ARP
+ // packets.
+ nicID := n.device.NICID()
+ if err := stack.Stack.AddAddress(nicID, arp.ProtocolNumber, arp.ProtocolAddress); err != nil {
+ panic(fmt.Sprintf("failed to add ARP address after creating new TUN/TAP interface with ID = %d", nicID))
+ }
+ }
+ return 0, err
case linux.TUNGETIFF:
var req linux.IFReq
- copy(req.IFName[:], fops.device.Name())
+ copy(req.IFName[:], n.device.Name())
// Linux adds IFF_NOFILTER (the same value as IFF_NO_PI unfortunately) when
// there is no sk_filter. See __tun_chr_ioctl() in net/drivers/tun.c.
- flags := fops.device.Flags() | linux.IFF_NOFILTER
+ flags := n.device.Flags() | linux.IFF_NOFILTER
usermem.ByteOrder.PutUint16(req.Data[:], flags)
_, err := req.CopyOut(t, data)
@@ -130,41 +142,41 @@ func (fops *netTunFileOperations) Ioctl(ctx context.Context, file *fs.File, io u
}
// Write implements fs.FileOperations.Write.
-func (fops *netTunFileOperations) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
+func (n *netTunFileOperations) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
data := make([]byte, src.NumBytes())
if _, err := src.CopyIn(ctx, data); err != nil {
return 0, err
}
- return fops.device.Write(data)
+ return n.device.Write(data)
}
// Read implements fs.FileOperations.Read.
-func (fops *netTunFileOperations) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
- data, err := fops.device.Read()
+func (n *netTunFileOperations) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
+ data, err := n.device.Read()
if err != nil {
return 0, err
}
- n, err := dst.CopyOut(ctx, data)
- if n > 0 && n < len(data) {
+ bytesCopied, err := dst.CopyOut(ctx, data)
+ if bytesCopied > 0 && bytesCopied < len(data) {
// Not an error for partial copying. Packet truncated.
err = nil
}
- return int64(n), err
+ return int64(bytesCopied), err
}
// Readiness implements watier.Waitable.Readiness.
-func (fops *netTunFileOperations) Readiness(mask waiter.EventMask) waiter.EventMask {
- return fops.device.Readiness(mask)
+func (n *netTunFileOperations) Readiness(mask waiter.EventMask) waiter.EventMask {
+ return n.device.Readiness(mask)
}
// EventRegister implements watier.Waitable.EventRegister.
-func (fops *netTunFileOperations) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
- fops.device.EventRegister(e, mask)
+func (n *netTunFileOperations) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
+ n.device.EventRegister(e, mask)
}
// EventUnregister implements watier.Waitable.EventUnregister.
-func (fops *netTunFileOperations) EventUnregister(e *waiter.Entry) {
- fops.device.EventUnregister(e)
+func (n *netTunFileOperations) EventUnregister(e *waiter.Entry) {
+ n.device.EventUnregister(e)
}
// isNetTunSupported returns whether /dev/net/tun device is supported for s.
diff --git a/pkg/tcpip/header/eth.go b/pkg/tcpip/header/eth.go
index eaface8cb..95ade0e5c 100644
--- a/pkg/tcpip/header/eth.go
+++ b/pkg/tcpip/header/eth.go
@@ -117,25 +117,31 @@ func (b Ethernet) Encode(e *EthernetFields) {
copy(b[dstMAC:][:EthernetAddressSize], e.DstAddr)
}
-// IsValidUnicastEthernetAddress returns true if addr is a valid unicast
+// IsMulticastEthernetAddress returns true if the address is a multicast
+// ethernet address.
+func IsMulticastEthernetAddress(addr tcpip.LinkAddress) bool {
+ if len(addr) != EthernetAddressSize {
+ return false
+ }
+
+ return addr[unicastMulticastFlagByteIdx]&unicastMulticastFlagMask != 0
+}
+
+// IsValidUnicastEthernetAddress returns true if the address is a unicast
// ethernet address.
func IsValidUnicastEthernetAddress(addr tcpip.LinkAddress) bool {
- // Must be of the right length.
if len(addr) != EthernetAddressSize {
return false
}
- // Must not be unspecified.
if addr == unspecifiedEthernetAddress {
return false
}
- // Must not be a multicast.
if addr[unicastMulticastFlagByteIdx]&unicastMulticastFlagMask != 0 {
return false
}
- // addr is a valid unicast ethernet address.
return true
}
diff --git a/pkg/tcpip/link/tun/device.go b/pkg/tcpip/link/tun/device.go
index b6ddbe81e..f94491026 100644
--- a/pkg/tcpip/link/tun/device.go
+++ b/pkg/tcpip/link/tun/device.go
@@ -76,13 +76,29 @@ func (d *Device) Release(ctx context.Context) {
}
}
+// NICID returns the NIC ID of the device.
+//
+// Must only be called after the device has been attached to an endpoint.
+func (d *Device) NICID() tcpip.NICID {
+ d.mu.RLock()
+ defer d.mu.RUnlock()
+
+ if d.endpoint == nil {
+ panic("called NICID on a device that has not been attached")
+ }
+
+ return d.endpoint.nicID
+}
+
// SetIff services TUNSETIFF ioctl(2) request.
-func (d *Device) SetIff(s *stack.Stack, name string, flags uint16) error {
+//
+// Returns true if a new NIC was created; false if an existing one was attached.
+func (d *Device) SetIff(s *stack.Stack, name string, flags uint16) (bool, error) {
d.mu.Lock()
defer d.mu.Unlock()
if d.endpoint != nil {
- return syserror.EINVAL
+ return false, syserror.EINVAL
}
// Input validations.
@@ -90,7 +106,7 @@ func (d *Device) SetIff(s *stack.Stack, name string, flags uint16) error {
isTap := flags&linux.IFF_TAP != 0
supportedFlags := uint16(linux.IFF_TUN | linux.IFF_TAP | linux.IFF_NO_PI)
if isTap && isTun || !isTap && !isTun || flags&^supportedFlags != 0 {
- return syserror.EINVAL
+ return false, syserror.EINVAL
}
prefix := "tun"
@@ -103,32 +119,32 @@ func (d *Device) SetIff(s *stack.Stack, name string, flags uint16) error {
linkCaps |= stack.CapabilityResolutionRequired
}
- endpoint, err := attachOrCreateNIC(s, name, prefix, linkCaps)
+ endpoint, created, err := attachOrCreateNIC(s, name, prefix, linkCaps)
if err != nil {
- return syserror.EINVAL
+ return false, syserror.EINVAL
}
d.endpoint = endpoint
d.notifyHandle = d.endpoint.AddNotify(d)
d.flags = flags
- return nil
+ return created, nil
}
-func attachOrCreateNIC(s *stack.Stack, name, prefix string, linkCaps stack.LinkEndpointCapabilities) (*tunEndpoint, error) {
+func attachOrCreateNIC(s *stack.Stack, name, prefix string, linkCaps stack.LinkEndpointCapabilities) (*tunEndpoint, bool, error) {
for {
// 1. Try to attach to an existing NIC.
if name != "" {
- if nic, found := s.GetNICByName(name); found {
- endpoint, ok := nic.LinkEndpoint().(*tunEndpoint)
+ if linkEP := s.GetLinkEndpointByName(name); linkEP != nil {
+ endpoint, ok := linkEP.(*tunEndpoint)
if !ok {
// Not a NIC created by tun device.
- return nil, syserror.EOPNOTSUPP
+ return nil, false, syserror.EOPNOTSUPP
}
if !endpoint.TryIncRef() {
// Race detected: NIC got deleted in between.
continue
}
- return endpoint, nil
+ return endpoint, false, nil
}
}
@@ -151,12 +167,12 @@ func attachOrCreateNIC(s *stack.Stack, name, prefix string, linkCaps stack.LinkE
})
switch err {
case nil:
- return endpoint, nil
+ return endpoint, true, nil
case tcpip.ErrDuplicateNICID:
// Race detected: A NIC has been created in between.
continue
default:
- return nil, syserror.EINVAL
+ return nil, false, syserror.EINVAL
}
}
}
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go
index b47a7be51..7df77c66e 100644
--- a/pkg/tcpip/network/arp/arp.go
+++ b/pkg/tcpip/network/arp/arp.go
@@ -49,7 +49,6 @@ type endpoint struct {
enabled uint32
nic stack.NetworkInterface
- linkEP stack.LinkEndpoint
linkAddrCache stack.LinkAddressCache
nud stack.NUDHandler
}
@@ -92,12 +91,12 @@ func (e *endpoint) DefaultTTL() uint8 {
}
func (e *endpoint) MTU() uint32 {
- lmtu := e.linkEP.MTU()
+ lmtu := e.nic.MTU()
return lmtu - uint32(e.MaxHeaderLength())
}
func (e *endpoint) MaxHeaderLength() uint16 {
- return e.linkEP.MaxHeaderLength() + header.ARPSize
+ return e.nic.MaxHeaderLength() + header.ARPSize
}
func (e *endpoint) Close() {
@@ -154,17 +153,25 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
e.nud.HandleProbe(remoteAddr, localAddr, ProtocolNumber, remoteLinkAddr, e.protocol)
}
- pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
- ReserveHeaderBytes: int(e.linkEP.MaxHeaderLength()) + header.ARPSize,
+ // As per RFC 826, under Packet Reception:
+ // Swap hardware and protocol fields, putting the local hardware and
+ // protocol addresses in the sender fields.
+ //
+ // Send the packet to the (new) target hardware address on the same
+ // hardware on which the request was received.
+ origSender := h.HardwareAddressSender()
+ r.RemoteLinkAddress = tcpip.LinkAddress(origSender)
+ respPkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
+ ReserveHeaderBytes: int(e.nic.MaxHeaderLength()) + header.ARPSize,
})
- packet := header.ARP(pkt.NetworkHeader().Push(header.ARPSize))
+ packet := header.ARP(respPkt.NetworkHeader().Push(header.ARPSize))
packet.SetIPv4OverEthernet()
packet.SetOp(header.ARPReply)
copy(packet.HardwareAddressSender(), r.LocalLinkAddress[:])
copy(packet.ProtocolAddressSender(), h.ProtocolAddressTarget())
- copy(packet.HardwareAddressTarget(), h.HardwareAddressSender())
+ copy(packet.HardwareAddressTarget(), origSender)
copy(packet.ProtocolAddressTarget(), h.ProtocolAddressSender())
- _ = e.linkEP.WritePacket(r, nil /* gso */, ProtocolNumber, pkt)
+ _ = e.nic.WritePacket(r, nil /* gso */, ProtocolNumber, respPkt)
case header.ARPReply:
addr := tcpip.Address(h.ProtocolAddressSender())
@@ -207,7 +214,6 @@ func (p *protocol) NewEndpoint(nic stack.NetworkInterface, linkAddrCache stack.L
e := &endpoint{
protocol: p,
nic: nic,
- linkEP: nic.LinkEndpoint(),
linkAddrCache: linkAddrCache,
nud: nud,
}
@@ -223,6 +229,7 @@ func (*protocol) LinkAddressProtocol() tcpip.NetworkProtocolNumber {
// LinkAddressRequest implements stack.LinkAddressResolver.LinkAddressRequest.
func (*protocol) LinkAddressRequest(addr, localAddr tcpip.Address, remoteLinkAddr tcpip.LinkAddress, linkEP stack.LinkEndpoint) *tcpip.Error {
r := &stack.Route{
+ NetProto: ProtocolNumber,
RemoteLinkAddress: remoteLinkAddr,
}
if len(r.RemoteLinkAddress) == 0 {
diff --git a/pkg/tcpip/network/ipv4/icmp.go b/pkg/tcpip/network/ipv4/icmp.go
index eab9a530c..3407755ed 100644
--- a/pkg/tcpip/network/ipv4/icmp.go
+++ b/pkg/tcpip/network/ipv4/icmp.go
@@ -102,8 +102,6 @@ func (e *endpoint) handleICMP(r *stack.Route, pkt *stack.PacketBuffer) {
e.dispatcher.DeliverTransportPacket(r, header.ICMPv4ProtocolNumber, pkt)
- remoteLinkAddr := r.RemoteLinkAddress
-
// As per RFC 1122 section 3.2.1.3, when a host sends any datagram, the IP
// source address MUST be one of its own IP addresses (but not a broadcast
// or multicast address).
@@ -119,9 +117,6 @@ func (e *endpoint) handleICMP(r *stack.Route, pkt *stack.PacketBuffer) {
}
defer r.Release()
- // Use the remote link address from the incoming packet.
- r.ResolveWith(remoteLinkAddr)
-
// TODO(gvisor.dev/issue/3810:) When adding protocol numbers into the
// header information, we may have to change this code to handle the
// ICMP header no longer being in the data buffer.
@@ -244,13 +239,7 @@ func (*icmpReasonProtoUnreachable) isICMPReason() {}
// the problematic packet. It incorporates as much of that packet as
// possible as well as any error metadata as is available. returnError
// expects pkt to hold a valid IPv4 packet as per the wire format.
-func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tcpip.Error {
- sent := r.Stats().ICMP.V4PacketsSent
- if !r.Stack().AllowICMPMessage() {
- sent.RateLimited.Increment()
- return nil
- }
-
+func (p *protocol) returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tcpip.Error {
// We check we are responding only when we are allowed to.
// See RFC 1812 section 4.3.2.7 (shown below).
//
@@ -279,6 +268,25 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
return nil
}
+ // Even if we were able to receive a packet from some remote, we may not have
+ // a route to it - the remote may be blocked via routing rules. We must always
+ // consult our routing table and find a route to the remote before sending any
+ // packet.
+ route, err := p.stack.FindRoute(r.NICID(), r.LocalAddress, r.RemoteAddress, ProtocolNumber, false /* multicastLoop */)
+ if err != nil {
+ return err
+ }
+ defer route.Release()
+ // From this point on, the incoming route should no longer be used; route
+ // must be used to send the ICMP error.
+ r = nil
+
+ sent := p.stack.Stats().ICMP.V4PacketsSent
+ if !p.stack.AllowICMPMessage() {
+ sent.RateLimited.Increment()
+ return nil
+ }
+
networkHeader := pkt.NetworkHeader().View()
transportHeader := pkt.TransportHeader().View()
@@ -329,11 +337,11 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
// least 8 bytes of the payload must be included. Today linux and other
// systems implement the RFC 1812 definition and not the original
// requirement. We treat 8 bytes as the minimum but will try send more.
- mtu := int(r.MTU())
+ mtu := int(route.MTU())
if mtu > header.IPv4MinimumProcessableDatagramSize {
mtu = header.IPv4MinimumProcessableDatagramSize
}
- headerLen := int(r.MaxHeaderLength()) + header.ICMPv4MinimumSize
+ headerLen := int(route.MaxHeaderLength()) + header.ICMPv4MinimumSize
available := int(mtu) - headerLen
if available < header.IPv4MinimumSize+header.ICMPv4MinimumErrorPayloadSize {
@@ -378,11 +386,11 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
icmpHdr.SetChecksum(header.ICMPv4Checksum(icmpHdr, icmpPkt.Data))
counter := sent.DstUnreachable
- if err := r.WritePacket(
+ if err := route.WritePacket(
nil, /* gso */
stack.NetworkHeaderParams{
Protocol: header.ICMPv4ProtocolNumber,
- TTL: r.DefaultTTL(),
+ TTL: route.DefaultTTL(),
TOS: stack.DefaultTOS,
},
icmpPkt,
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 99274dd45..c5ac7b8b5 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -66,7 +66,6 @@ var _ stack.NetworkEndpoint = (*endpoint)(nil)
type endpoint struct {
nic stack.NetworkInterface
- linkEP stack.LinkEndpoint
dispatcher stack.TransportDispatcher
protocol *protocol
@@ -87,7 +86,6 @@ type endpoint struct {
func (p *protocol) NewEndpoint(nic stack.NetworkInterface, _ stack.LinkAddressCache, _ stack.NUDHandler, dispatcher stack.TransportDispatcher) stack.NetworkEndpoint {
e := &endpoint{
nic: nic,
- linkEP: nic.LinkEndpoint(),
dispatcher: dispatcher,
protocol: p,
}
@@ -178,21 +176,13 @@ func (e *endpoint) DefaultTTL() uint8 {
// MTU implements stack.NetworkEndpoint.MTU. It returns the link-layer MTU minus
// the network layer max header length.
func (e *endpoint) MTU() uint32 {
- return calculateMTU(e.linkEP.MTU())
+ return calculateMTU(e.nic.MTU())
}
// MaxHeaderLength returns the maximum length needed by ipv4 headers (and
// underlying protocols).
func (e *endpoint) MaxHeaderLength() uint16 {
- return e.linkEP.MaxHeaderLength() + header.IPv4MaximumHeaderSize
-}
-
-// GSOMaxSize returns the maximum GSO packet size.
-func (e *endpoint) GSOMaxSize() uint32 {
- if gso, ok := e.linkEP.(stack.GSOEndpoint); ok {
- return gso.GSOMaxSize()
- }
- return 0
+ return e.nic.MaxHeaderLength() + header.IPv4MaximumHeaderSize
}
// NetworkProtocolNumber implements stack.NetworkEndpoint.NetworkProtocolNumber.
@@ -210,7 +200,7 @@ func (e *endpoint) writePacketFragments(r *stack.Route, gso *stack.GSO, mtu uint
for {
fragPkt, more := buildNextFragment(&pf, networkHeader)
- if err := e.linkEP.WritePacket(r, gso, ProtocolNumber, fragPkt); err != nil {
+ if err := e.nic.WritePacket(r, gso, ProtocolNumber, fragPkt); err != nil {
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(pf.RemainingFragmentCount() + 1))
return err
}
@@ -283,10 +273,10 @@ func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, params stack.Netw
if r.Loop&stack.PacketOut == 0 {
return nil
}
- if pkt.Size() > int(e.linkEP.MTU()) && (gso == nil || gso.Type == stack.GSONone) {
- return e.writePacketFragments(r, gso, e.linkEP.MTU(), pkt)
+ if pkt.Size() > int(e.nic.MTU()) && (gso == nil || gso.Type == stack.GSONone) {
+ return e.writePacketFragments(r, gso, e.nic.MTU(), pkt)
}
- if err := e.linkEP.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
+ if err := e.nic.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
r.Stats().IP.OutgoingPacketErrors.Increment()
return err
}
@@ -316,7 +306,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
if len(dropped) == 0 && len(natPkts) == 0 {
// Fast path: If no packets are to be dropped then we can just invoke the
// faster WritePackets API directly.
- n, err := e.linkEP.WritePackets(r, gso, pkts, ProtocolNumber)
+ n, err := e.nic.WritePackets(r, gso, pkts, ProtocolNumber)
r.Stats().IP.PacketsSent.IncrementBy(uint64(n))
if err != nil {
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(pkts.Len() - n))
@@ -343,7 +333,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
continue
}
}
- if err := e.linkEP.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
+ if err := e.nic.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
r.Stats().IP.PacketsSent.IncrementBy(uint64(n))
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(pkts.Len() - n - len(dropped)))
// Dropped packets aren't errors, so include them in
@@ -404,7 +394,7 @@ func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt *stack.PacketBu
return nil
}
- if err := e.linkEP.WritePacket(r, nil /* gso */, ProtocolNumber, pkt); err != nil {
+ if err := e.nic.WritePacket(r, nil /* gso */, ProtocolNumber, pkt); err != nil {
r.Stats().IP.OutgoingPacketErrors.Increment()
return err
}
@@ -512,13 +502,13 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// 3 (Port Unreachable), when the designated transport protocol
// (e.g., UDP) is unable to demultiplex the datagram but has no
// protocol mechanism to inform the sender.
- _ = returnError(r, &icmpReasonPortUnreachable{}, pkt)
+ _ = e.protocol.returnError(r, &icmpReasonPortUnreachable{}, pkt)
case stack.TransportPacketProtocolUnreachable:
// As per RFC: 1122 Section 3.2.2.1
// A host SHOULD generate Destination Unreachable messages with code:
// 2 (Protocol Unreachable), when the designated transport protocol
// is not supported
- _ = returnError(r, &icmpReasonProtoUnreachable{}, pkt)
+ _ = e.protocol.returnError(r, &icmpReasonProtoUnreachable{}, pkt)
default:
panic(fmt.Sprintf("unrecognized result from DeliverTransportPacket = %d", res))
}
diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index 37c169a5d..7be35c78b 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -440,8 +440,6 @@ func (e *endpoint) handleICMP(r *stack.Route, pkt *stack.PacketBuffer, hasFragme
return
}
- remoteLinkAddr := r.RemoteLinkAddress
-
// As per RFC 4291 section 2.7, multicast addresses must not be used as
// source addresses in IPv6 packets.
localAddr := r.LocalAddress
@@ -456,9 +454,6 @@ func (e *endpoint) handleICMP(r *stack.Route, pkt *stack.PacketBuffer, hasFragme
}
defer r.Release()
- // Use the link address from the source of the original packet.
- r.ResolveWith(remoteLinkAddr)
-
replyPkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
ReserveHeaderBytes: int(r.MaxHeaderLength()) + header.ICMPv6EchoMinimumSize,
Data: pkt.Data,
@@ -742,14 +737,7 @@ func (*icmpReasonPortUnreachable) isICMPReason() {}
// returnError takes an error descriptor and generates the appropriate ICMP
// error packet for IPv6 and sends it.
-func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tcpip.Error {
- stats := r.Stats().ICMP
- sent := stats.V6PacketsSent
- if !r.Stack().AllowICMPMessage() {
- sent.RateLimited.Increment()
- return nil
- }
-
+func (p *protocol) returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tcpip.Error {
// Only send ICMP error if the address is not a multicast v6
// address and the source is not the unspecified address.
//
@@ -780,6 +768,26 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
return nil
}
+ // Even if we were able to receive a packet from some remote, we may not have
+ // a route to it - the remote may be blocked via routing rules. We must always
+ // consult our routing table and find a route to the remote before sending any
+ // packet.
+ route, err := p.stack.FindRoute(r.NICID(), r.LocalAddress, r.RemoteAddress, ProtocolNumber, false /* multicastLoop */)
+ if err != nil {
+ return err
+ }
+ defer route.Release()
+ // From this point on, the incoming route should no longer be used; route
+ // must be used to send the ICMP error.
+ r = nil
+
+ stats := p.stack.Stats().ICMP
+ sent := stats.V6PacketsSent
+ if !p.stack.AllowICMPMessage() {
+ sent.RateLimited.Increment()
+ return nil
+ }
+
network, transport := pkt.NetworkHeader().View(), pkt.TransportHeader().View()
if pkt.TransportProtocolNumber == header.ICMPv6ProtocolNumber {
@@ -806,11 +814,11 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
// packet that caused the error) as possible without making
// the error message packet exceed the minimum IPv6 MTU
// [IPv6].
- mtu := int(r.MTU())
+ mtu := int(route.MTU())
if mtu > header.IPv6MinimumMTU {
mtu = header.IPv6MinimumMTU
}
- headerLen := int(r.MaxHeaderLength()) + header.ICMPv6ErrorHeaderSize
+ headerLen := int(route.MaxHeaderLength()) + header.ICMPv6ErrorHeaderSize
available := int(mtu) - headerLen
if available < header.IPv6MinimumSize {
return nil
@@ -843,9 +851,16 @@ func returnError(r *stack.Route, reason icmpReason, pkt *stack.PacketBuffer) *tc
default:
panic(fmt.Sprintf("unsupported ICMP type %T", reason))
}
- icmpHdr.SetChecksum(header.ICMPv6Checksum(icmpHdr, r.LocalAddress, r.RemoteAddress, newPkt.Data))
- err := r.WritePacket(nil /* gso */, stack.NetworkHeaderParams{Protocol: header.ICMPv6ProtocolNumber, TTL: r.DefaultTTL(), TOS: stack.DefaultTOS}, newPkt)
- if err != nil {
+ icmpHdr.SetChecksum(header.ICMPv6Checksum(icmpHdr, route.LocalAddress, route.RemoteAddress, newPkt.Data))
+ if err := route.WritePacket(
+ nil, /* gso */
+ stack.NetworkHeaderParams{
+ Protocol: header.ICMPv6ProtocolNumber,
+ TTL: route.DefaultTTL(),
+ TOS: stack.DefaultTOS,
+ },
+ newPkt,
+ ); err != nil {
sent.Dropped.Increment()
return err
}
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 826342c4f..2bd8f4ece 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -66,7 +66,6 @@ var _ NDPEndpoint = (*endpoint)(nil)
type endpoint struct {
nic stack.NetworkInterface
- linkEP stack.LinkEndpoint
linkAddrCache stack.LinkAddressCache
nud stack.NUDHandler
dispatcher stack.TransportDispatcher
@@ -364,21 +363,13 @@ func (e *endpoint) DefaultTTL() uint8 {
// MTU implements stack.NetworkEndpoint.MTU. It returns the link-layer MTU minus
// the network layer max header length.
func (e *endpoint) MTU() uint32 {
- return calculateMTU(e.linkEP.MTU())
+ return calculateMTU(e.nic.MTU())
}
// MaxHeaderLength returns the maximum length needed by ipv6 headers (and
// underlying protocols).
func (e *endpoint) MaxHeaderLength() uint16 {
- return e.linkEP.MaxHeaderLength() + header.IPv6MinimumSize
-}
-
-// GSOMaxSize returns the maximum GSO packet size.
-func (e *endpoint) GSOMaxSize() uint32 {
- if gso, ok := e.linkEP.(stack.GSOEndpoint); ok {
- return gso.GSOMaxSize()
- }
- return 0
+ return e.nic.MaxHeaderLength() + header.IPv6MinimumSize
}
func (e *endpoint) addIPHeader(r *stack.Route, pkt *stack.PacketBuffer, params stack.NetworkHeaderParams) {
@@ -396,7 +387,7 @@ func (e *endpoint) addIPHeader(r *stack.Route, pkt *stack.PacketBuffer, params s
}
func (e *endpoint) packetMustBeFragmented(pkt *stack.PacketBuffer, gso *stack.GSO) bool {
- return pkt.Size() > int(e.linkEP.MTU()) && (gso == nil || gso.Type == stack.GSONone)
+ return pkt.Size() > int(e.nic.MTU()) && (gso == nil || gso.Type == stack.GSONone)
}
// handleFragments fragments pkt and calls the handler function on each
@@ -477,19 +468,19 @@ func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, params stack.Netw
}
if e.packetMustBeFragmented(pkt, gso) {
- sent, remain, err := e.handleFragments(r, gso, e.linkEP.MTU(), pkt, params.Protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
+ sent, remain, err := e.handleFragments(r, gso, e.nic.MTU(), pkt, params.Protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
// TODO(gvisor.dev/issue/3884): Evaluate whether we want to send each
// fragment one by one using WritePacket() (current strategy) or if we
// want to create a PacketBufferList from the fragments and feed it to
// WritePackets(). It'll be faster but cost more memory.
- return e.linkEP.WritePacket(r, gso, ProtocolNumber, fragPkt)
+ return e.nic.WritePacket(r, gso, ProtocolNumber, fragPkt)
})
r.Stats().IP.PacketsSent.IncrementBy(uint64(sent))
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(remain))
return err
}
- if err := e.linkEP.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
+ if err := e.nic.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
r.Stats().IP.OutgoingPacketErrors.Increment()
return err
}
@@ -511,7 +502,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
e.addIPHeader(r, pb, params)
if e.packetMustBeFragmented(pb, gso) {
current := pb
- _, _, err := e.handleFragments(r, gso, e.linkEP.MTU(), pb, params.Protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
+ _, _, err := e.handleFragments(r, gso, e.nic.MTU(), pb, params.Protocol, func(fragPkt *stack.PacketBuffer) *tcpip.Error {
// Modify the packet list in place with the new fragments.
pkts.InsertAfter(current, fragPkt)
current = current.Next()
@@ -536,7 +527,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
if len(dropped) == 0 && len(natPkts) == 0 {
// Fast path: If no packets are to be dropped then we can just invoke the
// faster WritePackets API directly.
- n, err := e.linkEP.WritePackets(r, gso, pkts, ProtocolNumber)
+ n, err := e.nic.WritePackets(r, gso, pkts, ProtocolNumber)
r.Stats().IP.PacketsSent.IncrementBy(uint64(n))
if err != nil {
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(pkts.Len() - n))
@@ -563,7 +554,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
continue
}
}
- if err := e.linkEP.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
+ if err := e.nic.WritePacket(r, gso, ProtocolNumber, pkt); err != nil {
r.Stats().IP.PacketsSent.IncrementBy(uint64(n))
r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(pkts.Len() - n + len(dropped)))
// Dropped packets aren't errors, so include them in
@@ -643,7 +634,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// As per RFC 8200 section 4.1, the Hop By Hop extension header is
// restricted to appear immediately after an IPv6 fixed header.
if previousHeaderStart != 0 {
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6UnknownHeader,
pointer: previousHeaderStart,
}, pkt)
@@ -682,7 +673,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// ICMP Parameter Problem, Code 2, message to the packet's
// Source Address, pointing to the unrecognized Option Type.
//
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6UnknownOption,
pointer: it.ParseOffset() + optsIt.OptionOffset(),
respondToMulticast: true,
@@ -707,7 +698,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// header, so we just make sure Segments Left is zero before processing
// the next extension header.
if extHdr.SegmentsLeft() != 0 {
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6ErroneousHeader,
pointer: it.ParseOffset(),
}, pkt)
@@ -859,7 +850,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// ICMP Parameter Problem, Code 2, message to the packet's
// Source Address, pointing to the unrecognized Option Type.
//
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6UnknownOption,
pointer: it.ParseOffset() + optsIt.OptionOffset(),
respondToMulticast: true,
@@ -896,7 +887,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
// message with Code 4 in response to a packet for which the
// transport protocol (e.g., UDP) has no listener, if that transport
// protocol has no alternative means to inform the sender.
- _ = returnError(r, &icmpReasonPortUnreachable{}, pkt)
+ _ = e.protocol.returnError(r, &icmpReasonPortUnreachable{}, pkt)
case stack.TransportPacketProtocolUnreachable:
// As per RFC 8200 section 4. (page 7):
// Extension headers are numbered from IANA IP Protocol Numbers
@@ -917,7 +908,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
//
// Which when taken together indicate that an unknown protocol should
// be treated as an unrecognized next header value.
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6UnknownHeader,
pointer: it.ParseOffset(),
}, pkt)
@@ -927,7 +918,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
}
default:
- _ = returnError(r, &icmpReasonParameterProblem{
+ _ = e.protocol.returnError(r, &icmpReasonParameterProblem{
code: header.ICMPv6UnknownHeader,
pointer: it.ParseOffset(),
}, pkt)
@@ -1302,7 +1293,6 @@ func (*protocol) ParseAddresses(v buffer.View) (src, dst tcpip.Address) {
func (p *protocol) NewEndpoint(nic stack.NetworkInterface, linkAddrCache stack.LinkAddressCache, nud stack.NUDHandler, dispatcher stack.TransportDispatcher) stack.NetworkEndpoint {
e := &endpoint{
nic: nic,
- linkEP: nic.LinkEndpoint(),
linkAddrCache: linkAddrCache,
nud: nud,
dispatcher: dispatcher,
diff --git a/pkg/tcpip/network/ipv6/ndp.go b/pkg/tcpip/network/ipv6/ndp.go
index 48a4c65e3..40da011f8 100644
--- a/pkg/tcpip/network/ipv6/ndp.go
+++ b/pkg/tcpip/network/ipv6/ndp.go
@@ -1289,7 +1289,7 @@ func (ndp *ndpState) generateSLAACAddr(prefix tcpip.Subnet, state *slaacPrefixSt
//
// TODO(b/141011931): Validate a LinkEndpoint's link address (provided by
// LinkEndpoint.LinkAddress) before reaching this point.
- linkAddr := ndp.ep.linkEP.LinkAddress()
+ linkAddr := ndp.ep.nic.LinkAddress()
if !header.IsValidUnicastEthernetAddress(linkAddr) {
return false
}
diff --git a/pkg/tcpip/stack/neighbor_entry.go b/pkg/tcpip/stack/neighbor_entry.go
index 9a72bec79..4d69a4de1 100644
--- a/pkg/tcpip/stack/neighbor_entry.go
+++ b/pkg/tcpip/stack/neighbor_entry.go
@@ -236,7 +236,7 @@ func (e *neighborEntry) setStateLocked(next NeighborState) {
return
}
- if err := e.linkRes.LinkAddressRequest(e.neigh.Addr, e.neigh.LocalAddr, "", e.nic.linkEP); err != nil {
+ if err := e.linkRes.LinkAddressRequest(e.neigh.Addr, e.neigh.LocalAddr, "", e.nic.LinkEndpoint); err != nil {
// There is no need to log the error here; the NUD implementation may
// assume a working link. A valid link should be the responsibility of
// the NIC/stack.LinkEndpoint.
@@ -277,7 +277,7 @@ func (e *neighborEntry) setStateLocked(next NeighborState) {
return
}
- if err := e.linkRes.LinkAddressRequest(e.neigh.Addr, e.neigh.LocalAddr, e.neigh.LinkAddr, e.nic.linkEP); err != nil {
+ if err := e.linkRes.LinkAddressRequest(e.neigh.Addr, e.neigh.LocalAddr, e.neigh.LinkAddr, e.nic.LinkEndpoint); err != nil {
e.dispatchRemoveEventLocked()
e.setStateLocked(Failed)
return
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 6cf54cc89..8828cc5fe 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -32,10 +32,11 @@ var _ NetworkInterface = (*NIC)(nil)
// NIC represents a "network interface card" to which the networking stack is
// attached.
type NIC struct {
+ LinkEndpoint
+
stack *Stack
id tcpip.NICID
name string
- linkEP LinkEndpoint
context NICContext
stats NICStats
@@ -91,10 +92,11 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICC
// of IPv6 is supported on this endpoint's LinkEndpoint.
nic := &NIC{
+ LinkEndpoint: ep,
+
stack: stack,
id: id,
name: name,
- linkEP: ep,
context: ctx,
stats: makeNICStats(),
networkEndpoints: make(map[tcpip.NetworkProtocolNumber]NetworkEndpoint),
@@ -130,7 +132,7 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICC
nic.networkEndpoints[netNum] = netProto.NewEndpoint(nic, stack, nud, nic)
}
- nic.linkEP.Attach(nic)
+ nic.LinkEndpoint.Attach(nic)
return nic
}
@@ -220,7 +222,7 @@ func (n *NIC) remove() *tcpip.Error {
}
// Detach from link endpoint, so no packet comes in.
- n.linkEP.Attach(nil)
+ n.LinkEndpoint.Attach(nil)
return nil
}
@@ -240,7 +242,64 @@ func (n *NIC) isPromiscuousMode() bool {
// IsLoopback implements NetworkInterface.
func (n *NIC) IsLoopback() bool {
- return n.linkEP.Capabilities()&CapabilityLoopback != 0
+ return n.LinkEndpoint.Capabilities()&CapabilityLoopback != 0
+}
+
+// WritePacket implements NetworkLinkEndpoint.
+func (n *NIC) WritePacket(r *Route, gso *GSO, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) *tcpip.Error {
+ // As per relevant RFCs, we should queue packets while we wait for link
+ // resolution to complete.
+ //
+ // RFC 1122 section 2.3.2.2 (for IPv4):
+ // The link layer SHOULD save (rather than discard) at least
+ // one (the latest) packet of each set of packets destined to
+ // the same unresolved IP address, and transmit the saved
+ // packet when the address has been resolved.
+ //
+ // RFC 4861 section 5.2 (for IPv6):
+ // Once the IP address of the next-hop node is known, the sender
+ // examines the Neighbor Cache for link-layer information about that
+ // neighbor. If no entry exists, the sender creates one, sets its state
+ // to INCOMPLETE, initiates Address Resolution, and then queues the data
+ // packet pending completion of address resolution.
+ if ch, err := r.Resolve(nil); err != nil {
+ if err == tcpip.ErrWouldBlock {
+ r := r.Clone()
+ n.stack.linkResQueue.enqueue(ch, &r, protocol, pkt)
+ return nil
+ }
+ return err
+ }
+
+ return n.writePacket(r, gso, protocol, pkt)
+}
+
+func (n *NIC) writePacket(r *Route, gso *GSO, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) *tcpip.Error {
+ // WritePacket takes ownership of pkt, calculate numBytes first.
+ numBytes := pkt.Size()
+
+ if err := n.LinkEndpoint.WritePacket(r, gso, protocol, pkt); err != nil {
+ return err
+ }
+
+ n.stats.Tx.Packets.Increment()
+ n.stats.Tx.Bytes.IncrementBy(uint64(numBytes))
+ return nil
+}
+
+// WritePackets implements NetworkLinkEndpoint.
+func (n *NIC) WritePackets(r *Route, gso *GSO, pkts PacketBufferList, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+ // TODO(gvisor.dev/issue/4458): Queue packets whie link address resolution
+ // is being peformed like WritePacket.
+ writtenPackets, err := n.LinkEndpoint.WritePackets(r, gso, pkts, protocol)
+ n.stats.Tx.Packets.IncrementBy(uint64(writtenPackets))
+ writtenBytes := 0
+ for i, pb := 0, pkts.Front(); i < writtenPackets && pb != nil; i, pb = i+1, pb.Next() {
+ writtenBytes += pb.Size()
+ }
+
+ n.stats.Tx.Bytes.IncrementBy(uint64(writtenBytes))
+ return writtenPackets, err
}
// setSpoofing enables or disables address spoofing.
@@ -525,7 +584,7 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp
// If no local link layer address is provided, assume it was sent
// directly to this NIC.
if local == "" {
- local = n.linkEP.LinkAddress()
+ local = n.LinkEndpoint.LinkAddress()
}
// Are any packet type sockets listening for this network protocol?
@@ -605,7 +664,7 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp
n := r.nic
if addressEndpoint := n.getAddressOrCreateTempInner(protocol, dst, false, NeverPrimaryEndpoint); addressEndpoint != nil {
if n.isValidForOutgoing(addressEndpoint) {
- r.LocalLinkAddress = n.linkEP.LinkAddress()
+ r.LocalLinkAddress = n.LinkEndpoint.LinkAddress()
r.RemoteLinkAddress = remote
r.RemoteAddress = src
// TODO(b/123449044): Update the source NIC as well.
@@ -620,21 +679,21 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp
// n doesn't have a destination endpoint.
// Send the packet out of n.
- // TODO(b/128629022): move this logic to route.WritePacket.
// TODO(gvisor.dev/issue/1085): According to the RFC, we must decrease the TTL field for ipv4/ipv6.
- if ch, err := r.Resolve(nil); err != nil {
- if err == tcpip.ErrWouldBlock {
- n.stack.forwarder.enqueue(ch, n, &r, protocol, pkt)
- // forwarder will release route.
- return
- }
+
+ // pkt may have set its header and may not have enough headroom for
+ // link-layer header for the other link to prepend. Here we create a new
+ // packet to forward.
+ fwdPkt := NewPacketBuffer(PacketBufferOptions{
+ ReserveHeaderBytes: int(n.LinkEndpoint.MaxHeaderLength()),
+ Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
+ })
+
+ // TODO(b/143425874) Decrease the TTL field in forwarded packets.
+ if err := n.WritePacket(&r, nil, protocol, fwdPkt); err != nil {
n.stack.stats.IP.InvalidDestinationAddressesReceived.Increment()
- r.Release()
- return
}
- // The link-address resolution finished immediately.
- n.forwardPacket(&r, protocol, pkt)
r.Release()
return
}
@@ -658,34 +717,11 @@ func (n *NIC) DeliverOutboundPacket(remote, local tcpip.LinkAddress, protocol tc
p.PktType = tcpip.PacketOutgoing
// Add the link layer header as outgoing packets are intercepted
// before the link layer header is created.
- n.linkEP.AddHeader(local, remote, protocol, p)
+ n.LinkEndpoint.AddHeader(local, remote, protocol, p)
ep.HandlePacket(n.id, local, protocol, p)
}
}
-func (n *NIC) forwardPacket(r *Route, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) {
- // TODO(b/143425874) Decrease the TTL field in forwarded packets.
-
- // pkt may have set its header and may not have enough headroom for link-layer
- // header for the other link to prepend. Here we create a new packet to
- // forward.
- fwdPkt := NewPacketBuffer(PacketBufferOptions{
- ReserveHeaderBytes: int(n.linkEP.MaxHeaderLength()),
- Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
- })
-
- // WritePacket takes ownership of fwdPkt, calculate numBytes first.
- numBytes := fwdPkt.Size()
-
- if err := n.linkEP.WritePacket(r, nil /* gso */, protocol, fwdPkt); err != nil {
- r.Stats().IP.OutgoingPacketErrors.Increment()
- return
- }
-
- n.stats.Tx.Packets.Increment()
- n.stats.Tx.Bytes.IncrementBy(uint64(numBytes))
-}
-
// DeliverTransportPacket delivers the packets to the appropriate transport
// protocol endpoint.
func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, pkt *PacketBuffer) TransportPacketDisposition {
@@ -796,11 +832,6 @@ func (n *NIC) Name() string {
return n.name
}
-// LinkEndpoint implements NetworkInterface.
-func (n *NIC) LinkEndpoint() LinkEndpoint {
- return n.linkEP
-}
-
// nudConfigs gets the NUD configurations for n.
func (n *NIC) nudConfigs() (NUDConfigurations, *tcpip.Error) {
if n.neigh == nil {
diff --git a/pkg/tcpip/stack/forwarder.go b/pkg/tcpip/stack/pending_packets.go
index 3eff141e6..f838eda8d 100644
--- a/pkg/tcpip/stack/forwarder.go
+++ b/pkg/tcpip/stack/pending_packets.go
@@ -29,60 +29,60 @@ const (
)
type pendingPacket struct {
- nic *NIC
route *Route
proto tcpip.NetworkProtocolNumber
pkt *PacketBuffer
}
-type forwardQueue struct {
+// packetsPendingLinkResolution is a queue of packets pending link resolution.
+//
+// Once link resolution completes successfully, the packets will be written.
+type packetsPendingLinkResolution struct {
sync.Mutex
// The packets to send once the resolver completes.
- packets map[<-chan struct{}][]*pendingPacket
+ packets map[<-chan struct{}][]pendingPacket
// FIFO of channels used to cancel the oldest goroutine waiting for
// link-address resolution.
cancelChans []chan struct{}
}
-func newForwardQueue() *forwardQueue {
- return &forwardQueue{packets: make(map[<-chan struct{}][]*pendingPacket)}
+func (f *packetsPendingLinkResolution) init() {
+ f.Lock()
+ defer f.Unlock()
+ f.packets = make(map[<-chan struct{}][]pendingPacket)
}
-func (f *forwardQueue) enqueue(ch <-chan struct{}, n *NIC, r *Route, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) {
- shouldWait := false
-
+func (f *packetsPendingLinkResolution) enqueue(ch <-chan struct{}, r *Route, proto tcpip.NetworkProtocolNumber, pkt *PacketBuffer) {
f.Lock()
+ defer f.Unlock()
+
packets, ok := f.packets[ch]
- if !ok {
- shouldWait = true
- }
- for len(packets) == maxPendingPacketsPerResolution {
+ if len(packets) == maxPendingPacketsPerResolution {
p := packets[0]
+ packets[0] = pendingPacket{}
packets = packets[1:]
- p.nic.stack.stats.IP.OutgoingPacketErrors.Increment()
+ p.route.Stats().IP.OutgoingPacketErrors.Increment()
p.route.Release()
}
+
if l := len(packets); l >= maxPendingPacketsPerResolution {
panic(fmt.Sprintf("max pending packets for resolution reached; got %d packets, max = %d", l, maxPendingPacketsPerResolution))
}
- f.packets[ch] = append(packets, &pendingPacket{
- nic: n,
+
+ f.packets[ch] = append(packets, pendingPacket{
route: r,
- proto: protocol,
+ proto: proto,
pkt: pkt,
})
- f.Unlock()
- if !shouldWait {
+ if ok {
return
}
// Wait for the link-address resolution to complete.
- // Start a goroutine with a forwarding-cancel channel so that we can
- // limit the maximum number of goroutines running concurrently.
- cancel := f.newCancelChannel()
+ cancel := f.newCancelChannelLocked()
go func() {
cancelled := false
select {
@@ -92,17 +92,21 @@ func (f *forwardQueue) enqueue(ch <-chan struct{}, n *NIC, r *Route, protocol tc
}
f.Lock()
- packets := f.packets[ch]
+ packets, ok := f.packets[ch]
delete(f.packets, ch)
f.Unlock()
+ if !ok {
+ panic(fmt.Sprintf("link-resolution goroutine woke up but no entry exists in the queue of packets"))
+ }
+
for _, p := range packets {
if cancelled {
- p.nic.stack.stats.IP.OutgoingPacketErrors.Increment()
+ p.route.Stats().IP.OutgoingPacketErrors.Increment()
} else if _, err := p.route.Resolve(nil); err != nil {
- p.nic.stack.stats.IP.OutgoingPacketErrors.Increment()
+ p.route.Stats().IP.OutgoingPacketErrors.Increment()
} else {
- p.nic.forwardPacket(p.route, p.proto, p.pkt)
+ p.route.nic.writePacket(p.route, nil /* gso */, p.proto, p.pkt)
}
p.route.Release()
}
@@ -112,12 +116,10 @@ func (f *forwardQueue) enqueue(ch <-chan struct{}, n *NIC, r *Route, protocol tc
// newCancelChannel creates a channel that can cancel a pending forwarding
// activity. The oldest channel is closed if the number of open channels would
// exceed maxPendingResolutions.
-func (f *forwardQueue) newCancelChannel() chan struct{} {
- f.Lock()
- defer f.Unlock()
-
+func (f *packetsPendingLinkResolution) newCancelChannelLocked() chan struct{} {
if len(f.cancelChans) == maxPendingResolutions {
ch := f.cancelChans[0]
+ f.cancelChans[0] = nil
f.cancelChans = f.cancelChans[1:]
close(ch)
}
diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go
index be9bd8042..defb9129b 100644
--- a/pkg/tcpip/stack/registration.go
+++ b/pkg/tcpip/stack/registration.go
@@ -475,6 +475,8 @@ type NDPEndpoint interface {
// NetworkInterface is a network interface.
type NetworkInterface interface {
+ NetworkLinkEndpoint
+
// ID returns the interface's ID.
ID() tcpip.NICID
@@ -488,9 +490,6 @@ type NetworkInterface interface {
// Enabled returns true if the interface is enabled.
Enabled() bool
-
- // LinkEndpoint returns the link endpoint backing the interface.
- LinkEndpoint() LinkEndpoint
}
// NetworkEndpoint is the interface that needs to be implemented by endpoints
@@ -663,22 +662,15 @@ const (
CapabilitySoftwareGSO
)
-// LinkEndpoint is the interface implemented by data link layer protocols (e.g.,
-// ethernet, loopback, raw) and used by network layer protocols to send packets
-// out through the implementer's data link endpoint. When a link header exists,
-// it sets each PacketBuffer's LinkHeader field before passing it up the
-// stack.
-type LinkEndpoint interface {
+// NetworkLinkEndpoint is a data-link layer that supports sending network
+// layer packets.
+type NetworkLinkEndpoint interface {
// MTU is the maximum transmission unit for this endpoint. This is
// usually dictated by the backing physical network; when such a
// physical network doesn't exist, the limit is generally 64k, which
// includes the maximum size of an IP packet.
MTU() uint32
- // Capabilities returns the set of capabilities supported by the
- // endpoint.
- Capabilities() LinkEndpointCapabilities
-
// MaxHeaderLength returns the maximum size the data link (and
// lower level layers combined) headers can have. Higher levels use this
// information to reserve space in the front of the packets they're
@@ -686,7 +678,7 @@ type LinkEndpoint interface {
MaxHeaderLength() uint16
// LinkAddress returns the link address (typically a MAC) of the
- // link endpoint.
+ // endpoint.
LinkAddress() tcpip.LinkAddress
// WritePacket writes a packet with the given protocol through the
@@ -706,6 +698,19 @@ type LinkEndpoint interface {
// offload is enabled. If it will be used for something else, it may
// require to change syscall filters.
WritePackets(r *Route, gso *GSO, pkts PacketBufferList, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error)
+}
+
+// LinkEndpoint is the interface implemented by data link layer protocols (e.g.,
+// ethernet, loopback, raw) and used by network layer protocols to send packets
+// out through the implementer's data link endpoint. When a link header exists,
+// it sets each PacketBuffer's LinkHeader field before passing it up the
+// stack.
+type LinkEndpoint interface {
+ NetworkLinkEndpoint
+
+ // Capabilities returns the set of capabilities supported by the
+ // endpoint.
+ Capabilities() LinkEndpointCapabilities
// WriteRawPacket writes a packet directly to the link. The packet
// should already have an ethernet header. It takes ownership of vv.
diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go
index cc39c9a6a..25f80c1f8 100644
--- a/pkg/tcpip/stack/route.go
+++ b/pkg/tcpip/stack/route.go
@@ -72,21 +72,20 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip
loop |= PacketLoop
}
- linkEP := nic.LinkEndpoint()
r := Route{
NetProto: netProto,
LocalAddress: localAddr,
- LocalLinkAddress: linkEP.LinkAddress(),
+ LocalLinkAddress: nic.LinkEndpoint.LinkAddress(),
RemoteAddress: remoteAddr,
addressEndpoint: addressEndpoint,
nic: nic,
Loop: loop,
}
- if nic := r.nic; linkEP.Capabilities()&CapabilityResolutionRequired != 0 {
- if linkRes, ok := nic.stack.linkAddrResolvers[r.NetProto]; ok {
+ if r.nic.LinkEndpoint.Capabilities()&CapabilityResolutionRequired != 0 {
+ if linkRes, ok := r.nic.stack.linkAddrResolvers[r.NetProto]; ok {
r.linkRes = linkRes
- r.linkCache = nic.stack
+ r.linkCache = r.nic.stack
}
}
@@ -116,23 +115,17 @@ func (r *Route) PseudoHeaderChecksum(protocol tcpip.TransportProtocolNumber, tot
// Capabilities returns the link-layer capabilities of the route.
func (r *Route) Capabilities() LinkEndpointCapabilities {
- return r.nic.LinkEndpoint().Capabilities()
+ return r.nic.LinkEndpoint.Capabilities()
}
// GSOMaxSize returns the maximum GSO packet size.
func (r *Route) GSOMaxSize() uint32 {
- if gso, ok := r.nic.getNetworkEndpoint(r.NetProto).(GSOEndpoint); ok {
+ if gso, ok := r.nic.LinkEndpoint.(GSOEndpoint); ok {
return gso.GSOMaxSize()
}
return 0
}
-// ResolveWith immediately resolves a route with the specified remote link
-// address.
-func (r *Route) ResolveWith(addr tcpip.LinkAddress) {
- r.RemoteLinkAddress = addr
-}
-
// Resolve attempts to resolve the link address if necessary. Returns ErrWouldBlock in
// case address resolution requires blocking, e.g. wait for ARP reply. Waker is
// notified when address resolution is complete (success or not).
@@ -208,16 +201,7 @@ func (r *Route) WritePacket(gso *GSO, params NetworkHeaderParams, pkt *PacketBuf
return tcpip.ErrInvalidEndpointState
}
- // WritePacket takes ownership of pkt, calculate numBytes first.
- numBytes := pkt.Size()
-
- if err := r.nic.getNetworkEndpoint(r.NetProto).WritePacket(r, gso, params, pkt); err != nil {
- return err
- }
-
- r.nic.stats.Tx.Packets.Increment()
- r.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes))
- return nil
+ return r.nic.getNetworkEndpoint(r.NetProto).WritePacket(r, gso, params, pkt)
}
// WritePackets writes a list of n packets through the given route and returns
@@ -227,15 +211,7 @@ func (r *Route) WritePackets(gso *GSO, pkts PacketBufferList, params NetworkHead
return 0, tcpip.ErrInvalidEndpointState
}
- n, err := r.nic.getNetworkEndpoint(r.NetProto).WritePackets(r, gso, pkts, params)
- r.nic.stats.Tx.Packets.IncrementBy(uint64(n))
- writtenBytes := 0
- for i, pb := 0, pkts.Front(); i < n && pb != nil; i, pb = i+1, pb.Next() {
- writtenBytes += pb.Size()
- }
-
- r.nic.stats.Tx.Bytes.IncrementBy(uint64(writtenBytes))
- return n, err
+ return r.nic.getNetworkEndpoint(r.NetProto).WritePackets(r, gso, pkts, params)
}
// WriteHeaderIncludedPacket writes a packet already containing a network
@@ -245,15 +221,7 @@ func (r *Route) WriteHeaderIncludedPacket(pkt *PacketBuffer) *tcpip.Error {
return tcpip.ErrInvalidEndpointState
}
- // WriteHeaderIncludedPacket takes ownership of pkt, calculate numBytes first.
- numBytes := pkt.Data.Size()
-
- if err := r.nic.getNetworkEndpoint(r.NetProto).WriteHeaderIncludedPacket(r, pkt); err != nil {
- return err
- }
- r.nic.stats.Tx.Packets.Increment()
- r.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes))
- return nil
+ return r.nic.getNetworkEndpoint(r.NetProto).WriteHeaderIncludedPacket(r, pkt)
}
// DefaultTTL returns the default TTL of the underlying network endpoint.
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 0bf20c0e1..3a07577c8 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -436,9 +436,9 @@ type Stack struct {
// uniqueIDGenerator is a generator of unique identifiers.
uniqueIDGenerator UniqueID
- // forwarder holds the packets that wait for their link-address resolutions
- // to complete, and forwards them when each resolution is done.
- forwarder *forwardQueue
+ // linkResQueue holds packets that are waiting for link resolution to
+ // complete.
+ linkResQueue packetsPendingLinkResolution
// randomGenerator is an injectable pseudo random generator that can be
// used when a random number is required.
@@ -550,8 +550,8 @@ type TransportEndpointInfo struct {
// incompatible with the receiver.
//
// Preconditon: the parent endpoint mu must be held while calling this method.
-func (e *TransportEndpointInfo) AddrNetProtoLocked(addr tcpip.FullAddress, v6only bool) (tcpip.FullAddress, tcpip.NetworkProtocolNumber, *tcpip.Error) {
- netProto := e.NetProto
+func (t *TransportEndpointInfo) AddrNetProtoLocked(addr tcpip.FullAddress, v6only bool) (tcpip.FullAddress, tcpip.NetworkProtocolNumber, *tcpip.Error) {
+ netProto := t.NetProto
switch len(addr.Addr) {
case header.IPv4AddressSize:
netProto = header.IPv4ProtocolNumber
@@ -565,7 +565,7 @@ func (e *TransportEndpointInfo) AddrNetProtoLocked(addr tcpip.FullAddress, v6onl
}
}
- switch len(e.ID.LocalAddress) {
+ switch len(t.ID.LocalAddress) {
case header.IPv4AddressSize:
if len(addr.Addr) == header.IPv6AddressSize {
return tcpip.FullAddress{}, 0, tcpip.ErrInvalidEndpointState
@@ -577,8 +577,8 @@ func (e *TransportEndpointInfo) AddrNetProtoLocked(addr tcpip.FullAddress, v6onl
}
switch {
- case netProto == e.NetProto:
- case netProto == header.IPv4ProtocolNumber && e.NetProto == header.IPv6ProtocolNumber:
+ case netProto == t.NetProto:
+ case netProto == header.IPv4ProtocolNumber && t.NetProto == header.IPv6ProtocolNumber:
if v6only {
return tcpip.FullAddress{}, 0, tcpip.ErrNoRoute
}
@@ -640,7 +640,6 @@ func New(opts Options) *Stack {
useNeighborCache: opts.UseNeighborCache,
uniqueIDGenerator: opts.UniqueID,
nudDisp: opts.NUDDisp,
- forwarder: newForwardQueue(),
randomGenerator: mathrand.New(randSrc),
sendBufferSize: SendBufferSizeOption{
Min: MinBufferSize,
@@ -653,6 +652,7 @@ func New(opts Options) *Stack {
Max: DefaultMaxBufferSize,
},
}
+ s.linkResQueue.init()
// Add specified network protocols.
for _, netProtoFactory := range opts.NetworkProtocols {
@@ -928,16 +928,16 @@ func (s *Stack) CreateNIC(id tcpip.NICID, ep LinkEndpoint) *tcpip.Error {
return s.CreateNICWithOptions(id, ep, NICOptions{})
}
-// GetNICByName gets the NIC specified by name.
-func (s *Stack) GetNICByName(name string) (*NIC, bool) {
+// GetLinkEndpointByName gets the link endpoint specified by name.
+func (s *Stack) GetLinkEndpointByName(name string) LinkEndpoint {
s.mu.RLock()
defer s.mu.RUnlock()
for _, nic := range s.nics {
if nic.Name() == name {
- return nic, true
+ return nic.LinkEndpoint
}
}
- return nil, false
+ return nil
}
// EnableNIC enables the given NIC so that the link-layer endpoint can start
@@ -1062,13 +1062,13 @@ func (s *Stack) NICInfo() map[tcpip.NICID]NICInfo {
}
nics[id] = NICInfo{
Name: nic.name,
- LinkAddress: nic.linkEP.LinkAddress(),
+ LinkAddress: nic.LinkEndpoint.LinkAddress(),
ProtocolAddresses: nic.primaryAddresses(),
Flags: flags,
- MTU: nic.linkEP.MTU(),
+ MTU: nic.LinkEndpoint.MTU(),
Stats: nic.stats,
Context: nic.context,
- ARPHardwareType: nic.linkEP.ARPHardwareType(),
+ ARPHardwareType: nic.LinkEndpoint.ARPHardwareType(),
}
}
return nics
@@ -1323,7 +1323,7 @@ func (s *Stack) GetLinkAddress(nicID tcpip.NICID, addr, localAddr tcpip.Address,
fullAddr := tcpip.FullAddress{NIC: nicID, Addr: addr}
linkRes := s.linkAddrResolvers[protocol]
- return s.linkAddrCache.get(fullAddr, linkRes, localAddr, nic.linkEP, waker)
+ return s.linkAddrCache.get(fullAddr, linkRes, localAddr, nic.LinkEndpoint, waker)
}
// Neighbors returns all IP to MAC address associations.
@@ -1539,7 +1539,7 @@ func (s *Stack) Wait() {
s.mu.RLock()
defer s.mu.RUnlock()
for _, n := range s.nics {
- n.linkEP.Wait()
+ n.LinkEndpoint.Wait()
}
}
@@ -1627,7 +1627,7 @@ func (s *Stack) WritePacket(nicID tcpip.NICID, dst tcpip.LinkAddress, netProto t
// Add our own fake ethernet header.
ethFields := header.EthernetFields{
- SrcAddr: nic.linkEP.LinkAddress(),
+ SrcAddr: nic.LinkEndpoint.LinkAddress(),
DstAddr: dst,
Type: netProto,
}
@@ -1636,7 +1636,7 @@ func (s *Stack) WritePacket(nicID tcpip.NICID, dst tcpip.LinkAddress, netProto t
vv := buffer.View(fakeHeader).ToVectorisedView()
vv.Append(payload)
- if err := nic.linkEP.WriteRawPacket(vv); err != nil {
+ if err := nic.LinkEndpoint.WriteRawPacket(vv); err != nil {
return err
}
@@ -1653,7 +1653,7 @@ func (s *Stack) WriteRawPacket(nicID tcpip.NICID, payload buffer.VectorisedView)
return tcpip.ErrUnknownDevice
}
- if err := nic.linkEP.WriteRawPacket(payload); err != nil {
+ if err := nic.LinkEndpoint.WriteRawPacket(payload); err != nil {
return err
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 17:39:32 +0000