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-rw-r--r--pkg/tcpip/buffer/view.go55
-rw-r--r--pkg/tcpip/link/loopback/loopback.go10
-rw-r--r--pkg/tcpip/link/sniffer/sniffer.go65
-rw-r--r--pkg/tcpip/network/arp/arp.go5
-rw-r--r--pkg/tcpip/network/ipv4/icmp.go20
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go12
-rw-r--r--pkg/tcpip/network/ipv6/icmp.go74
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go6
-rwxr-xr-xpkg/tcpip/stack/iptables.go22
-rwxr-xr-xpkg/tcpip/stack/iptables_targets.go23
-rw-r--r--pkg/tcpip/stack/nic.go34
-rwxr-xr-xpkg/tcpip/stack/packet_buffer.go4
-rw-r--r--pkg/tcpip/transport/icmp/endpoint.go8
-rw-r--r--pkg/tcpip/transport/tcp/segment.go29
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go6
-rw-r--r--pkg/tcpip/transport/udp/protocol.go9
16 files changed, 128 insertions, 254 deletions
diff --git a/pkg/tcpip/buffer/view.go b/pkg/tcpip/buffer/view.go
index f01217c91..8ec5d5d5c 100644
--- a/pkg/tcpip/buffer/view.go
+++ b/pkg/tcpip/buffer/view.go
@@ -77,8 +77,7 @@ func NewVectorisedView(size int, views []View) VectorisedView {
return VectorisedView{views: views, size: size}
}
-// TrimFront removes the first "count" bytes of the vectorised view. It panics
-// if count > vv.Size().
+// TrimFront removes the first "count" bytes of the vectorised view.
func (vv *VectorisedView) TrimFront(count int) {
for count > 0 && len(vv.views) > 0 {
if count < len(vv.views[0]) {
@@ -87,7 +86,7 @@ func (vv *VectorisedView) TrimFront(count int) {
return
}
count -= len(vv.views[0])
- vv.removeFirst()
+ vv.RemoveFirst()
}
}
@@ -105,7 +104,7 @@ func (vv *VectorisedView) Read(v View) (copied int, err error) {
count -= len(vv.views[0])
copy(v[copied:], vv.views[0])
copied += len(vv.views[0])
- vv.removeFirst()
+ vv.RemoveFirst()
}
if copied == 0 {
return 0, io.EOF
@@ -127,7 +126,7 @@ func (vv *VectorisedView) ReadToVV(dstVV *VectorisedView, count int) (copied int
count -= len(vv.views[0])
dstVV.AppendView(vv.views[0])
copied += len(vv.views[0])
- vv.removeFirst()
+ vv.RemoveFirst()
}
return copied
}
@@ -163,37 +162,22 @@ func (vv *VectorisedView) Clone(buffer []View) VectorisedView {
return VectorisedView{views: append(buffer[:0], vv.views...), size: vv.size}
}
-// PullUp returns the first "count" bytes of the vectorised view. If those
-// bytes aren't already contiguous inside the vectorised view, PullUp will
-// reallocate as needed to make them contiguous. PullUp fails and returns false
-// when count > vv.Size().
-func (vv *VectorisedView) PullUp(count int) (View, bool) {
+// First returns the first view of the vectorised view.
+func (vv *VectorisedView) First() View {
if len(vv.views) == 0 {
- return nil, count == 0
- }
- if count <= len(vv.views[0]) {
- return vv.views[0][:count], true
- }
- if count > vv.size {
- return nil, false
+ return nil
}
+ return vv.views[0]
+}
- newFirst := NewView(count)
- i := 0
- for offset := 0; offset < count; i++ {
- copy(newFirst[offset:], vv.views[i])
- if count-offset < len(vv.views[i]) {
- vv.views[i].TrimFront(count - offset)
- break
- }
- offset += len(vv.views[i])
- vv.views[i] = nil
+// RemoveFirst removes the first view of the vectorised view.
+func (vv *VectorisedView) RemoveFirst() {
+ if len(vv.views) == 0 {
+ return
}
- // We're guaranteed that i > 0, since count is too large for the first
- // view.
- vv.views[i-1] = newFirst
- vv.views = vv.views[i-1:]
- return newFirst, true
+ vv.size -= len(vv.views[0])
+ vv.views[0] = nil
+ vv.views = vv.views[1:]
}
// Size returns the size in bytes of the entire content stored in the vectorised view.
@@ -241,10 +225,3 @@ func (vv *VectorisedView) Readers() []bytes.Reader {
}
return readers
}
-
-// removeFirst panics when len(vv.views) < 1.
-func (vv *VectorisedView) removeFirst() {
- vv.size -= len(vv.views[0])
- vv.views[0] = nil
- vv.views = vv.views[1:]
-}
diff --git a/pkg/tcpip/link/loopback/loopback.go b/pkg/tcpip/link/loopback/loopback.go
index 073c84ef9..1e2255bfa 100644
--- a/pkg/tcpip/link/loopback/loopback.go
+++ b/pkg/tcpip/link/loopback/loopback.go
@@ -98,13 +98,13 @@ func (e *endpoint) WritePackets(*stack.Route, *stack.GSO, stack.PacketBufferList
// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
func (e *endpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
- // There should be an ethernet header at the beginning of vv.
- hdr, ok := vv.PullUp(header.EthernetMinimumSize)
- if !ok {
- // Reject the packet if it's shorter than an ethernet header.
+ // Reject the packet if it's shorter than an ethernet header.
+ if vv.Size() < header.EthernetMinimumSize {
return tcpip.ErrBadAddress
}
- linkHeader := header.Ethernet(hdr)
+
+ // There should be an ethernet header at the beginning of vv.
+ linkHeader := header.Ethernet(vv.First()[:header.EthernetMinimumSize])
vv.TrimFront(len(linkHeader))
e.dispatcher.DeliverNetworkPacket(e, "" /* remote */, "" /* local */, linkHeader.Type(), stack.PacketBuffer{
Data: vv,
diff --git a/pkg/tcpip/link/sniffer/sniffer.go b/pkg/tcpip/link/sniffer/sniffer.go
index 0799c8f4d..be2537a82 100644
--- a/pkg/tcpip/link/sniffer/sniffer.go
+++ b/pkg/tcpip/link/sniffer/sniffer.go
@@ -171,7 +171,11 @@ func (e *endpoint) GSOMaxSize() uint32 {
func (e *endpoint) dumpPacket(prefix string, gso *stack.GSO, protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) {
writer := e.writer
if writer == nil && atomic.LoadUint32(&LogPackets) == 1 {
- logPacket(prefix, protocol, pkt, gso)
+ first := pkt.Header.View()
+ if len(first) == 0 {
+ first = pkt.Data.First()
+ }
+ logPacket(prefix, protocol, first, gso)
}
if writer != nil && atomic.LoadUint32(&LogPacketsToPCAP) == 1 {
totalLength := pkt.Header.UsedLength() + pkt.Data.Size()
@@ -234,7 +238,7 @@ func (e *endpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
// Wait implements stack.LinkEndpoint.Wait.
func (e *endpoint) Wait() { e.lower.Wait() }
-func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer, gso *stack.GSO) {
+func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, b buffer.View, gso *stack.GSO) {
// Figure out the network layer info.
var transProto uint8
src := tcpip.Address("unknown")
@@ -243,49 +247,28 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
size := uint16(0)
var fragmentOffset uint16
var moreFragments bool
-
- // Create a clone of pkt, including any headers if present. Avoid allocating
- // backing memory for the clone.
- views := [8]buffer.View{}
- vv := buffer.NewVectorisedView(0, views[:0])
- vv.AppendView(pkt.Header.View())
- vv.Append(pkt.Data)
-
switch protocol {
case header.IPv4ProtocolNumber:
- hdr, ok := vv.PullUp(header.IPv4MinimumSize)
- if !ok {
- return
- }
- ipv4 := header.IPv4(hdr)
+ ipv4 := header.IPv4(b)
fragmentOffset = ipv4.FragmentOffset()
moreFragments = ipv4.Flags()&header.IPv4FlagMoreFragments == header.IPv4FlagMoreFragments
src = ipv4.SourceAddress()
dst = ipv4.DestinationAddress()
transProto = ipv4.Protocol()
size = ipv4.TotalLength() - uint16(ipv4.HeaderLength())
- vv.TrimFront(int(ipv4.HeaderLength()))
+ b = b[ipv4.HeaderLength():]
id = int(ipv4.ID())
case header.IPv6ProtocolNumber:
- hdr, ok := vv.PullUp(header.IPv6MinimumSize)
- if !ok {
- return
- }
- ipv6 := header.IPv6(hdr)
+ ipv6 := header.IPv6(b)
src = ipv6.SourceAddress()
dst = ipv6.DestinationAddress()
transProto = ipv6.NextHeader()
size = ipv6.PayloadLength()
- vv.TrimFront(header.IPv6MinimumSize)
+ b = b[header.IPv6MinimumSize:]
case header.ARPProtocolNumber:
- hdr, ok := vv.PullUp(header.ARPSize)
- if !ok {
- return
- }
- vv.TrimFront(header.ARPSize)
- arp := header.ARP(hdr)
+ arp := header.ARP(b)
log.Infof(
"%s arp %v (%v) -> %v (%v) valid:%v",
prefix,
@@ -301,7 +284,7 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
// We aren't guaranteed to have a transport header - it's possible for
// writes via raw endpoints to contain only network headers.
- if minSize, ok := transportProtocolMinSizes[tcpip.TransportProtocolNumber(transProto)]; ok && vv.Size() < minSize {
+ if minSize, ok := transportProtocolMinSizes[tcpip.TransportProtocolNumber(transProto)]; ok && len(b) < minSize {
log.Infof("%s %v -> %v transport protocol: %d, but no transport header found (possible raw packet)", prefix, src, dst, transProto)
return
}
@@ -314,11 +297,7 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
switch tcpip.TransportProtocolNumber(transProto) {
case header.ICMPv4ProtocolNumber:
transName = "icmp"
- hdr, ok := vv.PullUp(header.ICMPv4MinimumSize)
- if !ok {
- break
- }
- icmp := header.ICMPv4(hdr)
+ icmp := header.ICMPv4(b)
icmpType := "unknown"
if fragmentOffset == 0 {
switch icmp.Type() {
@@ -351,11 +330,7 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
case header.ICMPv6ProtocolNumber:
transName = "icmp"
- hdr, ok := vv.PullUp(header.ICMPv6MinimumSize)
- if !ok {
- break
- }
- icmp := header.ICMPv6(hdr)
+ icmp := header.ICMPv6(b)
icmpType := "unknown"
switch icmp.Type() {
case header.ICMPv6DstUnreachable:
@@ -386,11 +361,7 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
case header.UDPProtocolNumber:
transName = "udp"
- hdr, ok := vv.PullUp(header.UDPMinimumSize)
- if !ok {
- break
- }
- udp := header.UDP(hdr)
+ udp := header.UDP(b)
if fragmentOffset == 0 && len(udp) >= header.UDPMinimumSize {
srcPort = udp.SourcePort()
dstPort = udp.DestinationPort()
@@ -400,11 +371,7 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
case header.TCPProtocolNumber:
transName = "tcp"
- hdr, ok := vv.PullUp(header.TCPMinimumSize)
- if !ok {
- break
- }
- tcp := header.TCP(hdr)
+ tcp := header.TCP(b)
if fragmentOffset == 0 && len(tcp) >= header.TCPMinimumSize {
offset := int(tcp.DataOffset())
if offset < header.TCPMinimumSize {
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go
index cf73a939e..7acbfa0a8 100644
--- a/pkg/tcpip/network/arp/arp.go
+++ b/pkg/tcpip/network/arp/arp.go
@@ -93,10 +93,7 @@ func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuf
}
func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) {
- v, ok := pkt.Data.PullUp(header.ARPSize)
- if !ok {
- return
- }
+ v := pkt.Data.First()
h := header.ARP(v)
if !h.IsValid() {
return
diff --git a/pkg/tcpip/network/ipv4/icmp.go b/pkg/tcpip/network/ipv4/icmp.go
index 4cbefe5ab..c4bf1ba5c 100644
--- a/pkg/tcpip/network/ipv4/icmp.go
+++ b/pkg/tcpip/network/ipv4/icmp.go
@@ -25,11 +25,7 @@ import (
// used to find out which transport endpoint must be notified about the ICMP
// packet.
func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.PacketBuffer) {
- h, ok := pkt.Data.PullUp(header.IPv4MinimumSize)
- if !ok {
- return
- }
- hdr := header.IPv4(h)
+ h := header.IPv4(pkt.Data.First())
// We don't use IsValid() here because ICMP only requires that the IP
// header plus 8 bytes of the transport header be included. So it's
@@ -38,12 +34,12 @@ func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.
//
// Drop packet if it doesn't have the basic IPv4 header or if the
// original source address doesn't match the endpoint's address.
- if hdr.SourceAddress() != e.id.LocalAddress {
+ if len(h) < header.IPv4MinimumSize || h.SourceAddress() != e.id.LocalAddress {
return
}
- hlen := int(hdr.HeaderLength())
- if pkt.Data.Size() < hlen || hdr.FragmentOffset() != 0 {
+ hlen := int(h.HeaderLength())
+ if pkt.Data.Size() < hlen || h.FragmentOffset() != 0 {
// We won't be able to handle this if it doesn't contain the
// full IPv4 header, or if it's a fragment not at offset 0
// (because it won't have the transport header).
@@ -52,15 +48,15 @@ func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.
// Skip the ip header, then deliver control message.
pkt.Data.TrimFront(hlen)
- p := hdr.TransportProtocol()
- e.dispatcher.DeliverTransportControlPacket(e.id.LocalAddress, hdr.DestinationAddress(), ProtocolNumber, p, typ, extra, pkt)
+ p := h.TransportProtocol()
+ e.dispatcher.DeliverTransportControlPacket(e.id.LocalAddress, h.DestinationAddress(), ProtocolNumber, p, typ, extra, pkt)
}
func (e *endpoint) handleICMP(r *stack.Route, pkt stack.PacketBuffer) {
stats := r.Stats()
received := stats.ICMP.V4PacketsReceived
- v, ok := pkt.Data.PullUp(header.ICMPv4MinimumSize)
- if !ok {
+ v := pkt.Data.First()
+ if len(v) < header.ICMPv4MinimumSize {
received.Invalid.Increment()
return
}
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 17202cc7a..104aafbed 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -328,11 +328,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.Packe
func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuffer) *tcpip.Error {
// The packet already has an IP header, but there are a few required
// checks.
- h, ok := pkt.Data.PullUp(header.IPv4MinimumSize)
- if !ok {
- return tcpip.ErrInvalidOptionValue
- }
- ip := header.IPv4(h)
+ ip := header.IPv4(pkt.Data.First())
if !ip.IsValid(pkt.Data.Size()) {
return tcpip.ErrInvalidOptionValue
}
@@ -382,11 +378,7 @@ func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuf
// HandlePacket is called by the link layer when new ipv4 packets arrive for
// this endpoint.
func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) {
- headerView, ok := pkt.Data.PullUp(header.IPv4MinimumSize)
- if !ok {
- r.Stats().IP.MalformedPacketsReceived.Increment()
- return
- }
+ headerView := pkt.Data.First()
h := header.IPv4(headerView)
if !h.IsValid(pkt.Data.Size()) {
r.Stats().IP.MalformedPacketsReceived.Increment()
diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index bdf3a0d25..b68983d10 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -28,11 +28,7 @@ import (
// used to find out which transport endpoint must be notified about the ICMP
// packet.
func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.PacketBuffer) {
- h, ok := pkt.Data.PullUp(header.IPv6MinimumSize)
- if !ok {
- return
- }
- hdr := header.IPv6(h)
+ h := header.IPv6(pkt.Data.First())
// We don't use IsValid() here because ICMP only requires that up to
// 1280 bytes of the original packet be included. So it's likely that it
@@ -40,21 +36,17 @@ func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.
//
// Drop packet if it doesn't have the basic IPv6 header or if the
// original source address doesn't match the endpoint's address.
- if hdr.SourceAddress() != e.id.LocalAddress {
+ if len(h) < header.IPv6MinimumSize || h.SourceAddress() != e.id.LocalAddress {
return
}
// Skip the IP header, then handle the fragmentation header if there
// is one.
pkt.Data.TrimFront(header.IPv6MinimumSize)
- p := hdr.TransportProtocol()
+ p := h.TransportProtocol()
if p == header.IPv6FragmentHeader {
- f, ok := pkt.Data.PullUp(header.IPv6FragmentHeaderSize)
- if !ok {
- return
- }
- fragHdr := header.IPv6Fragment(f)
- if !fragHdr.IsValid() || fragHdr.FragmentOffset() != 0 {
+ f := header.IPv6Fragment(pkt.Data.First())
+ if !f.IsValid() || f.FragmentOffset() != 0 {
// We can't handle fragments that aren't at offset 0
// because they don't have the transport headers.
return
@@ -63,19 +55,19 @@ func (e *endpoint) handleControl(typ stack.ControlType, extra uint32, pkt stack.
// Skip fragmentation header and find out the actual protocol
// number.
pkt.Data.TrimFront(header.IPv6FragmentHeaderSize)
- p = fragHdr.TransportProtocol()
+ p = f.TransportProtocol()
}
// Deliver the control packet to the transport endpoint.
- e.dispatcher.DeliverTransportControlPacket(e.id.LocalAddress, hdr.DestinationAddress(), ProtocolNumber, p, typ, extra, pkt)
+ e.dispatcher.DeliverTransportControlPacket(e.id.LocalAddress, h.DestinationAddress(), ProtocolNumber, p, typ, extra, pkt)
}
func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.PacketBuffer, hasFragmentHeader bool) {
stats := r.Stats().ICMP
sent := stats.V6PacketsSent
received := stats.V6PacketsReceived
- v, ok := pkt.Data.PullUp(header.ICMPv6HeaderSize)
- if !ok {
+ v := pkt.Data.First()
+ if len(v) < header.ICMPv6MinimumSize {
received.Invalid.Increment()
return
}
@@ -84,9 +76,11 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
// Validate ICMPv6 checksum before processing the packet.
//
+ // Only the first view in vv is accounted for by h. To account for the
+ // rest of vv, a shallow copy is made and the first view is removed.
// This copy is used as extra payload during the checksum calculation.
payload := pkt.Data.Clone(nil)
- payload.TrimFront(len(h))
+ payload.RemoveFirst()
if got, want := h.Checksum(), header.ICMPv6Checksum(h, iph.SourceAddress(), iph.DestinationAddress(), payload); got != want {
received.Invalid.Increment()
return
@@ -107,40 +101,34 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
switch h.Type() {
case header.ICMPv6PacketTooBig:
received.PacketTooBig.Increment()
- hdr, ok := pkt.Data.PullUp(header.ICMPv6PacketTooBigMinimumSize)
- if !ok {
+ if len(v) < header.ICMPv6PacketTooBigMinimumSize {
received.Invalid.Increment()
return
}
pkt.Data.TrimFront(header.ICMPv6PacketTooBigMinimumSize)
- mtu := header.ICMPv6(hdr).MTU()
+ mtu := h.MTU()
e.handleControl(stack.ControlPacketTooBig, calculateMTU(mtu), pkt)
case header.ICMPv6DstUnreachable:
received.DstUnreachable.Increment()
- hdr, ok := pkt.Data.PullUp(header.ICMPv6DstUnreachableMinimumSize)
- if !ok {
+ if len(v) < header.ICMPv6DstUnreachableMinimumSize {
received.Invalid.Increment()
return
}
pkt.Data.TrimFront(header.ICMPv6DstUnreachableMinimumSize)
- switch header.ICMPv6(hdr).Code() {
+ switch h.Code() {
case header.ICMPv6PortUnreachable:
e.handleControl(stack.ControlPortUnreachable, 0, pkt)
}
case header.ICMPv6NeighborSolicit:
received.NeighborSolicit.Increment()
- if pkt.Data.Size() < header.ICMPv6NeighborSolicitMinimumSize || !isNDPValid() {
+ if len(v) < header.ICMPv6NeighborSolicitMinimumSize || !isNDPValid() {
received.Invalid.Increment()
return
}
- // The remainder of payload must be only the neighbor solicitation, so
- // payload.ToView() always returns the solicitation. Per RFC 6980 section 5,
- // NDP messages cannot be fragmented. Also note that in the common case NDP
- // datagrams are very small and ToView() will not incur allocations.
- ns := header.NDPNeighborSolicit(payload.ToView())
+ ns := header.NDPNeighborSolicit(h.NDPPayload())
it, err := ns.Options().Iter(true)
if err != nil {
// If we have a malformed NDP NS option, drop the packet.
@@ -298,16 +286,12 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
case header.ICMPv6NeighborAdvert:
received.NeighborAdvert.Increment()
- if pkt.Data.Size() < header.ICMPv6NeighborAdvertSize || !isNDPValid() {
+ if len(v) < header.ICMPv6NeighborAdvertSize || !isNDPValid() {
received.Invalid.Increment()
return
}
- // The remainder of payload must be only the neighbor advertisement, so
- // payload.ToView() always returns the advertisement. Per RFC 6980 section
- // 5, NDP messages cannot be fragmented. Also note that in the common case
- // NDP datagrams are very small and ToView() will not incur allocations.
- na := header.NDPNeighborAdvert(payload.ToView())
+ na := header.NDPNeighborAdvert(h.NDPPayload())
it, err := na.Options().Iter(true)
if err != nil {
// If we have a malformed NDP NA option, drop the packet.
@@ -379,15 +363,14 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
case header.ICMPv6EchoRequest:
received.EchoRequest.Increment()
- icmpHdr, ok := pkt.Data.PullUp(header.ICMPv6EchoMinimumSize)
- if !ok {
+ if len(v) < header.ICMPv6EchoMinimumSize {
received.Invalid.Increment()
return
}
pkt.Data.TrimFront(header.ICMPv6EchoMinimumSize)
hdr := buffer.NewPrependable(int(r.MaxHeaderLength()) + header.ICMPv6EchoMinimumSize)
packet := header.ICMPv6(hdr.Prepend(header.ICMPv6EchoMinimumSize))
- copy(packet, icmpHdr)
+ copy(packet, h)
packet.SetType(header.ICMPv6EchoReply)
packet.SetChecksum(header.ICMPv6Checksum(packet, r.LocalAddress, r.RemoteAddress, pkt.Data))
if err := r.WritePacket(nil /* gso */, stack.NetworkHeaderParams{Protocol: header.ICMPv6ProtocolNumber, TTL: r.DefaultTTL(), TOS: stack.DefaultTOS}, stack.PacketBuffer{
@@ -401,7 +384,7 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
case header.ICMPv6EchoReply:
received.EchoReply.Increment()
- if pkt.Data.Size() < header.ICMPv6EchoMinimumSize {
+ if len(v) < header.ICMPv6EchoMinimumSize {
received.Invalid.Increment()
return
}
@@ -423,9 +406,8 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
case header.ICMPv6RouterAdvert:
received.RouterAdvert.Increment()
- // Is the NDP payload of sufficient size to hold a Router
- // Advertisement?
- if pkt.Data.Size()-header.ICMPv6HeaderSize < header.NDPRAMinimumSize || !isNDPValid() {
+ p := h.NDPPayload()
+ if len(p) < header.NDPRAMinimumSize || !isNDPValid() {
received.Invalid.Increment()
return
}
@@ -443,11 +425,7 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, pkt stack.P
return
}
- // The remainder of payload must be only the router advertisement, so
- // payload.ToView() always returns the advertisement. Per RFC 6980 section
- // 5, NDP messages cannot be fragmented. Also note that in the common case
- // NDP datagrams are very small and ToView() will not incur allocations.
- ra := header.NDPRouterAdvert(payload.ToView())
+ ra := header.NDPRouterAdvert(p)
opts := ra.Options()
// Are options valid as per the wire format?
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 486725131..331b0817b 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -171,11 +171,7 @@ func (*endpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt stack.PacketBuffe
// HandlePacket is called by the link layer when new ipv6 packets arrive for
// this endpoint.
func (e *endpoint) HandlePacket(r *stack.Route, pkt stack.PacketBuffer) {
- headerView, ok := pkt.Data.PullUp(header.IPv6MinimumSize)
- if !ok {
- r.Stats().IP.MalformedPacketsReceived.Increment()
- return
- }
+ headerView := pkt.Data.First()
h := header.IPv6(headerView)
if !h.IsValid(pkt.Data.Size()) {
r.Stats().IP.MalformedPacketsReceived.Increment()
diff --git a/pkg/tcpip/stack/iptables.go b/pkg/tcpip/stack/iptables.go
index 6b91159d4..6c0a4b24d 100755
--- a/pkg/tcpip/stack/iptables.go
+++ b/pkg/tcpip/stack/iptables.go
@@ -212,11 +212,6 @@ func (it *IPTables) Check(hook Hook, pkt PacketBuffer) bool {
// CheckPackets runs pkts through the rules for hook and returns a map of packets that
// should not go forward.
//
-// Precondition: pkt is a IPv4 packet of at least length header.IPv4MinimumSize.
-//
-// TODO(gvisor.dev/issue/170): pk.NetworkHeader will always be set as a
-// precondition.
-//
// NOTE: unlike the Check API the returned map contains packets that should be
// dropped.
func (it *IPTables) CheckPackets(hook Hook, pkts PacketBufferList) (drop map[*PacketBuffer]struct{}) {
@@ -231,9 +226,7 @@ func (it *IPTables) CheckPackets(hook Hook, pkts PacketBufferList) (drop map[*Pa
return drop
}
-// Precondition: pkt is a IPv4 packet of at least length header.IPv4MinimumSize.
-// TODO(gvisor.dev/issue/170): pk.NetworkHeader will always be set as a
-// precondition.
+// Precondition: pkt.NetworkHeader is set.
func (it *IPTables) checkChain(hook Hook, pkt PacketBuffer, table Table, ruleIdx int) chainVerdict {
// Start from ruleIdx and walk the list of rules until a rule gives us
// a verdict.
@@ -278,21 +271,14 @@ func (it *IPTables) checkChain(hook Hook, pkt PacketBuffer, table Table, ruleIdx
return chainDrop
}
-// Precondition: pkt is a IPv4 packet of at least length header.IPv4MinimumSize.
-// TODO(gvisor.dev/issue/170): pk.NetworkHeader will always be set as a
-// precondition.
+// Precondition: pk.NetworkHeader is set.
func (it *IPTables) checkRule(hook Hook, pkt PacketBuffer, table Table, ruleIdx int) (RuleVerdict, int) {
rule := table.Rules[ruleIdx]
// If pkt.NetworkHeader hasn't been set yet, it will be contained in
- // pkt.Data.
+ // pkt.Data.First().
if pkt.NetworkHeader == nil {
- var ok bool
- pkt.NetworkHeader, ok = pkt.Data.PullUp(header.IPv4MinimumSize)
- if !ok {
- // Precondition has been violated.
- panic(fmt.Sprintf("iptables checks require IPv4 headers of at least %d bytes", header.IPv4MinimumSize))
- }
+ pkt.NetworkHeader = pkt.Data.First()
}
// Check whether the packet matches the IP header filter.
diff --git a/pkg/tcpip/stack/iptables_targets.go b/pkg/tcpip/stack/iptables_targets.go
index 8be61f4b1..7b4543caf 100755
--- a/pkg/tcpip/stack/iptables_targets.go
+++ b/pkg/tcpip/stack/iptables_targets.go
@@ -96,12 +96,9 @@ func (rt RedirectTarget) Action(pkt PacketBuffer) (RuleVerdict, int) {
newPkt := pkt.Clone()
// Set network header.
- headerView, ok := newPkt.Data.PullUp(header.IPv4MinimumSize)
- if !ok {
- return RuleDrop, 0
- }
+ headerView := newPkt.Data.First()
netHeader := header.IPv4(headerView)
- newPkt.NetworkHeader = headerView
+ newPkt.NetworkHeader = headerView[:header.IPv4MinimumSize]
hlen := int(netHeader.HeaderLength())
tlen := int(netHeader.TotalLength())
@@ -120,14 +117,10 @@ func (rt RedirectTarget) Action(pkt PacketBuffer) (RuleVerdict, int) {
if newPkt.TransportHeader != nil {
udpHeader = header.UDP(newPkt.TransportHeader)
} else {
- if pkt.Data.Size() < header.UDPMinimumSize {
- return RuleDrop, 0
- }
- hdr, ok := newPkt.Data.PullUp(header.UDPMinimumSize)
- if !ok {
+ if len(pkt.Data.First()) < header.UDPMinimumSize {
return RuleDrop, 0
}
- udpHeader = header.UDP(hdr)
+ udpHeader = header.UDP(newPkt.Data.First())
}
udpHeader.SetDestinationPort(rt.MinPort)
case header.TCPProtocolNumber:
@@ -135,14 +128,10 @@ func (rt RedirectTarget) Action(pkt PacketBuffer) (RuleVerdict, int) {
if newPkt.TransportHeader != nil {
tcpHeader = header.TCP(newPkt.TransportHeader)
} else {
- if pkt.Data.Size() < header.TCPMinimumSize {
+ if len(pkt.Data.First()) < header.TCPMinimumSize {
return RuleDrop, 0
}
- hdr, ok := newPkt.Data.PullUp(header.TCPMinimumSize)
- if !ok {
- return RuleDrop, 0
- }
- tcpHeader = header.TCP(hdr)
+ tcpHeader = header.TCP(newPkt.TransportHeader)
}
// TODO(gvisor.dev/issue/170): Need to recompute checksum
// and implement nat connection tracking to support TCP.
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 0c2b1f36a..016dbe15e 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -1203,12 +1203,12 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.Link
n.stack.stats.IP.PacketsReceived.Increment()
}
- netHeader, ok := pkt.Data.PullUp(netProto.MinimumPacketSize())
- if !ok {
+ if len(pkt.Data.First()) < netProto.MinimumPacketSize() {
n.stack.stats.MalformedRcvdPackets.Increment()
return
}
- src, dst := netProto.ParseAddresses(netHeader)
+
+ src, dst := netProto.ParseAddresses(pkt.Data.First())
if n.stack.handleLocal && !n.isLoopback() && n.getRef(protocol, src) != nil {
// The source address is one of our own, so we never should have gotten a
@@ -1289,8 +1289,22 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.Link
func (n *NIC) forwardPacket(r *Route, protocol tcpip.NetworkProtocolNumber, pkt PacketBuffer) {
// TODO(b/143425874) Decrease the TTL field in forwarded packets.
- if linkHeaderLen := int(n.linkEP.MaxHeaderLength()); linkHeaderLen != 0 {
- pkt.Header = buffer.NewPrependable(linkHeaderLen)
+
+ firstData := pkt.Data.First()
+ pkt.Data.RemoveFirst()
+
+ if linkHeaderLen := int(n.linkEP.MaxHeaderLength()); linkHeaderLen == 0 {
+ pkt.Header = buffer.NewPrependableFromView(firstData)
+ } else {
+ firstDataLen := len(firstData)
+
+ // pkt.Header should have enough capacity to hold n.linkEP's headers.
+ pkt.Header = buffer.NewPrependable(firstDataLen + linkHeaderLen)
+
+ // TODO(b/151227689): avoid copying the packet when forwarding
+ if n := copy(pkt.Header.Prepend(firstDataLen), firstData); n != firstDataLen {
+ panic(fmt.Sprintf("copied %d bytes, expected %d", n, firstDataLen))
+ }
}
if err := n.linkEP.WritePacket(r, nil /* gso */, protocol, pkt); err != nil {
@@ -1318,13 +1332,12 @@ func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolN
// validly formed.
n.stack.demux.deliverRawPacket(r, protocol, pkt)
- transHeader, ok := pkt.Data.PullUp(transProto.MinimumPacketSize())
- if !ok {
+ if len(pkt.Data.First()) < transProto.MinimumPacketSize() {
n.stack.stats.MalformedRcvdPackets.Increment()
return
}
- srcPort, dstPort, err := transProto.ParsePorts(transHeader)
+ srcPort, dstPort, err := transProto.ParsePorts(pkt.Data.First())
if err != nil {
n.stack.stats.MalformedRcvdPackets.Increment()
return
@@ -1362,12 +1375,11 @@ func (n *NIC) DeliverTransportControlPacket(local, remote tcpip.Address, net tcp
// ICMPv4 only guarantees that 8 bytes of the transport protocol will
// be present in the payload. We know that the ports are within the
// first 8 bytes for all known transport protocols.
- transHeader, ok := pkt.Data.PullUp(8)
- if !ok {
+ if len(pkt.Data.First()) < 8 {
return
}
- srcPort, dstPort, err := transProto.ParsePorts(transHeader)
+ srcPort, dstPort, err := transProto.ParsePorts(pkt.Data.First())
if err != nil {
return
}
diff --git a/pkg/tcpip/stack/packet_buffer.go b/pkg/tcpip/stack/packet_buffer.go
index e954a8b7e..dc125f25e 100755
--- a/pkg/tcpip/stack/packet_buffer.go
+++ b/pkg/tcpip/stack/packet_buffer.go
@@ -37,9 +37,7 @@ type PacketBuffer struct {
Data buffer.VectorisedView
// Header holds the headers of outbound packets. As a packet is passed
- // down the stack, each layer adds to Header. Note that forwarded
- // packets don't populate Headers on their way out -- their headers and
- // payload are never parsed out and remain in Data.
+ // down the stack, each layer adds to Header.
Header buffer.Prependable
// These fields are used by both inbound and outbound packets. They
diff --git a/pkg/tcpip/transport/icmp/endpoint.go b/pkg/tcpip/transport/icmp/endpoint.go
index b1d820372..feef8dca0 100644
--- a/pkg/tcpip/transport/icmp/endpoint.go
+++ b/pkg/tcpip/transport/icmp/endpoint.go
@@ -747,15 +747,15 @@ func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pk
// Only accept echo replies.
switch e.NetProto {
case header.IPv4ProtocolNumber:
- h, ok := pkt.Data.PullUp(header.ICMPv4MinimumSize)
- if !ok || header.ICMPv4(h).Type() != header.ICMPv4EchoReply {
+ h := header.ICMPv4(pkt.Data.First())
+ if h.Type() != header.ICMPv4EchoReply {
e.stack.Stats().DroppedPackets.Increment()
e.stats.ReceiveErrors.MalformedPacketsReceived.Increment()
return
}
case header.IPv6ProtocolNumber:
- h, ok := pkt.Data.PullUp(header.ICMPv6MinimumSize)
- if !ok || header.ICMPv6(h).Type() != header.ICMPv6EchoReply {
+ h := header.ICMPv6(pkt.Data.First())
+ if h.Type() != header.ICMPv6EchoReply {
e.stack.Stats().DroppedPackets.Increment()
e.stats.ReceiveErrors.MalformedPacketsReceived.Increment()
return
diff --git a/pkg/tcpip/transport/tcp/segment.go b/pkg/tcpip/transport/tcp/segment.go
index 7712ce652..40461fd31 100644
--- a/pkg/tcpip/transport/tcp/segment.go
+++ b/pkg/tcpip/transport/tcp/segment.go
@@ -144,11 +144,7 @@ func (s *segment) logicalLen() seqnum.Size {
// TCP checksum and stores the checksum and result of checksum verification in
// the csum and csumValid fields of the segment.
func (s *segment) parse() bool {
- h, ok := s.data.PullUp(header.TCPMinimumSize)
- if !ok {
- return false
- }
- hdr := header.TCP(h)
+ h := header.TCP(s.data.First())
// h is the header followed by the payload. We check that the offset to
// the data respects the following constraints:
@@ -160,16 +156,12 @@ func (s *segment) parse() bool {
// N.B. The segment has already been validated as having at least the
// minimum TCP size before reaching here, so it's safe to read the
// fields.
- offset := int(hdr.DataOffset())
- if offset < header.TCPMinimumSize {
- return false
- }
- hdrWithOpts, ok := s.data.PullUp(offset)
- if !ok {
+ offset := int(h.DataOffset())
+ if offset < header.TCPMinimumSize || offset > len(h) {
return false
}
- s.options = []byte(hdrWithOpts[header.TCPMinimumSize:])
+ s.options = []byte(h[header.TCPMinimumSize:offset])
s.parsedOptions = header.ParseTCPOptions(s.options)
// Query the link capabilities to decide if checksum validation is
@@ -181,19 +173,18 @@ func (s *segment) parse() bool {
s.data.TrimFront(offset)
}
if verifyChecksum {
- hdr = header.TCP(hdrWithOpts)
- s.csum = hdr.Checksum()
+ s.csum = h.Checksum()
xsum := s.route.PseudoHeaderChecksum(ProtocolNumber, uint16(s.data.Size()))
- xsum = hdr.CalculateChecksum(xsum)
+ xsum = h.CalculateChecksum(xsum)
s.data.TrimFront(offset)
xsum = header.ChecksumVV(s.data, xsum)
s.csumValid = xsum == 0xffff
}
- s.sequenceNumber = seqnum.Value(hdr.SequenceNumber())
- s.ackNumber = seqnum.Value(hdr.AckNumber())
- s.flags = hdr.Flags()
- s.window = seqnum.Size(hdr.WindowSize())
+ s.sequenceNumber = seqnum.Value(h.SequenceNumber())
+ s.ackNumber = seqnum.Value(h.AckNumber())
+ s.flags = h.Flags()
+ s.window = seqnum.Size(h.WindowSize())
return true
}
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 756ab913a..edb54f0be 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -1250,8 +1250,8 @@ func (e *endpoint) Readiness(mask waiter.EventMask) waiter.EventMask {
// endpoint.
func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pkt stack.PacketBuffer) {
// Get the header then trim it from the view.
- hdr, ok := pkt.Data.PullUp(header.UDPMinimumSize)
- if !ok || int(header.UDP(hdr).Length()) > pkt.Data.Size() {
+ hdr := header.UDP(pkt.Data.First())
+ if int(hdr.Length()) > pkt.Data.Size() {
// Malformed packet.
e.stack.Stats().UDP.MalformedPacketsReceived.Increment()
e.stats.ReceiveErrors.MalformedPacketsReceived.Increment()
@@ -1286,7 +1286,7 @@ func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pk
senderAddress: tcpip.FullAddress{
NIC: r.NICID(),
Addr: id.RemoteAddress,
- Port: header.UDP(hdr).SourcePort(),
+ Port: hdr.SourcePort(),
},
}
packet.data = pkt.Data
diff --git a/pkg/tcpip/transport/udp/protocol.go b/pkg/tcpip/transport/udp/protocol.go
index 52af6de22..6e31a9bac 100644
--- a/pkg/tcpip/transport/udp/protocol.go
+++ b/pkg/tcpip/transport/udp/protocol.go
@@ -68,13 +68,8 @@ func (*protocol) ParsePorts(v buffer.View) (src, dst uint16, err *tcpip.Error) {
// that don't match any existing endpoint.
func (p *protocol) HandleUnknownDestinationPacket(r *stack.Route, id stack.TransportEndpointID, pkt stack.PacketBuffer) bool {
// Get the header then trim it from the view.
- h, ok := pkt.Data.PullUp(header.UDPMinimumSize)
- if !ok {
- // Malformed packet.
- r.Stack().Stats().UDP.MalformedPacketsReceived.Increment()
- return true
- }
- if int(header.UDP(h).Length()) > pkt.Data.Size() {
+ hdr := header.UDP(pkt.Data.First())
+ if int(hdr.Length()) > pkt.Data.Size() {
// Malformed packet.
r.Stack().Stats().UDP.MalformedPacketsReceived.Increment()
return true
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 16:57:53 +0000