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-rw-r--r--pkg/tcpip/link/loopback/loopback.go10
-rw-r--r--pkg/tcpip/link/sniffer/sniffer.go65
2 files changed, 21 insertions, 54 deletions
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 {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 05:00:52 +0000