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Diffstat (limited to 'pkg/tcpip/link/sniffer')
-rw-r--r--pkg/tcpip/link/sniffer/sniffer.go277
1 files changed, 137 insertions, 140 deletions
diff --git a/pkg/tcpip/link/sniffer/sniffer.go b/pkg/tcpip/link/sniffer/sniffer.go
index 147d4e242..122680e10 100644
--- a/pkg/tcpip/link/sniffer/sniffer.go
+++ b/pkg/tcpip/link/sniffer/sniffer.go
@@ -118,7 +118,7 @@ func NewWithFile(lower stack.LinkEndpoint, file *os.File, snapLen uint32) (stack
// logs the packet before forwarding to the actual dispatcher.
func (e *endpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) {
if atomic.LoadUint32(&LogPackets) == 1 && e.file == nil {
- logPacket("recv", protocol, pkt, nil)
+ logPacket("recv", protocol, pkt.Data.First(), nil)
}
if e.file != nil && atomic.LoadUint32(&LogPacketsToFile) == 1 {
vs := pkt.Data.Views()
@@ -195,7 +195,7 @@ func (e *endpoint) GSOMaxSize() uint32 {
func (e *endpoint) dumpPacket(gso *stack.GSO, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) {
if atomic.LoadUint32(&LogPackets) == 1 && e.file == nil {
- logPacket("send", protocol, pkt, gso)
+ logPacket("send", protocol, pkt.Header.View(), gso)
}
if e.file != nil && atomic.LoadUint32(&LogPacketsToFile) == 1 {
hdrBuf := pkt.Header.View()
@@ -247,7 +247,7 @@ func (e *endpoint) WritePackets(r *stack.Route, gso *stack.GSO, hdrs []stack.Pac
// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
func (e *endpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
if atomic.LoadUint32(&LogPackets) == 1 && e.file == nil {
- logPacket("send raw packet", 0, tcpip.PacketBuffer{}, nil /* gso */)
+ logPacket("send", 0, buffer.View("[raw packet, no header available]"), nil /* gso */)
}
if e.file != nil && atomic.LoadUint32(&LogPacketsToFile) == 1 {
length := vv.Size()
@@ -289,7 +289,7 @@ func logVectorisedView(vv buffer.VectorisedView, length int, buf *bytes.Buffer)
// Wait implements stack.LinkEndpoint.Wait.
func (*endpoint) Wait() {}
-func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt tcpip.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")
@@ -298,40 +298,39 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt tcpip.Pa
size := uint16(0)
var fragmentOffset uint16
var moreFragments bool
-
- if pkt.NetworkHeader != nil {
- switch protocol {
- case header.IPv4ProtocolNumber:
- ipv4 := header.IPv4(pkt.NetworkHeader)
- 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())
- id = int(ipv4.ID())
-
- case header.IPv6ProtocolNumber:
- ipv6 := header.IPv6(pkt.NetworkHeader)
- src = ipv6.SourceAddress()
- dst = ipv6.DestinationAddress()
- transProto = ipv6.NextHeader()
- size = ipv6.PayloadLength()
-
- case header.ARPProtocolNumber:
- arp := header.ARP(pkt.NetworkHeader)
- log.Infof(
- "%s arp %v (%v) -> %v (%v) valid:%v",
- prefix,
- tcpip.Address(arp.ProtocolAddressSender()), tcpip.LinkAddress(arp.HardwareAddressSender()),
- tcpip.Address(arp.ProtocolAddressTarget()), tcpip.LinkAddress(arp.HardwareAddressTarget()),
- arp.IsValid(),
- )
- return
- default:
- log.Infof("%s unknown network protocol", prefix)
- return
- }
+ switch protocol {
+ case header.IPv4ProtocolNumber:
+ 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())
+ b = b[ipv4.HeaderLength():]
+ id = int(ipv4.ID())
+
+ case header.IPv6ProtocolNumber:
+ ipv6 := header.IPv6(b)
+ src = ipv6.SourceAddress()
+ dst = ipv6.DestinationAddress()
+ transProto = ipv6.NextHeader()
+ size = ipv6.PayloadLength()
+ b = b[header.IPv6MinimumSize:]
+
+ case header.ARPProtocolNumber:
+ arp := header.ARP(b)
+ log.Infof(
+ "%s arp %v (%v) -> %v (%v) valid:%v",
+ prefix,
+ tcpip.Address(arp.ProtocolAddressSender()), tcpip.LinkAddress(arp.HardwareAddressSender()),
+ tcpip.Address(arp.ProtocolAddressTarget()), tcpip.LinkAddress(arp.HardwareAddressTarget()),
+ arp.IsValid(),
+ )
+ return
+ default:
+ log.Infof("%s unknown network protocol", prefix)
+ return
}
// Figure out the transport layer info.
@@ -339,120 +338,118 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt tcpip.Pa
srcPort := uint16(0)
dstPort := uint16(0)
details := ""
- if pkt.TransportHeader != nil {
- switch tcpip.TransportProtocolNumber(transProto) {
- case header.ICMPv4ProtocolNumber:
- transName = "icmp"
- icmp := header.ICMPv4(pkt.TransportHeader)
- icmpType := "unknown"
- if fragmentOffset == 0 {
- switch icmp.Type() {
- case header.ICMPv4EchoReply:
- icmpType = "echo reply"
- case header.ICMPv4DstUnreachable:
- icmpType = "destination unreachable"
- case header.ICMPv4SrcQuench:
- icmpType = "source quench"
- case header.ICMPv4Redirect:
- icmpType = "redirect"
- case header.ICMPv4Echo:
- icmpType = "echo"
- case header.ICMPv4TimeExceeded:
- icmpType = "time exceeded"
- case header.ICMPv4ParamProblem:
- icmpType = "param problem"
- case header.ICMPv4Timestamp:
- icmpType = "timestamp"
- case header.ICMPv4TimestampReply:
- icmpType = "timestamp reply"
- case header.ICMPv4InfoRequest:
- icmpType = "info request"
- case header.ICMPv4InfoReply:
- icmpType = "info reply"
- }
- }
- log.Infof("%s %s %v -> %v %s len:%d id:%04x code:%d", prefix, transName, src, dst, icmpType, size, id, icmp.Code())
- return
-
- case header.ICMPv6ProtocolNumber:
- transName = "icmp"
- icmp := header.ICMPv6(pkt.TransportHeader)
- icmpType := "unknown"
+ switch tcpip.TransportProtocolNumber(transProto) {
+ case header.ICMPv4ProtocolNumber:
+ transName = "icmp"
+ icmp := header.ICMPv4(b)
+ icmpType := "unknown"
+ if fragmentOffset == 0 {
switch icmp.Type() {
- case header.ICMPv6DstUnreachable:
+ case header.ICMPv4EchoReply:
+ icmpType = "echo reply"
+ case header.ICMPv4DstUnreachable:
icmpType = "destination unreachable"
- case header.ICMPv6PacketTooBig:
- icmpType = "packet too big"
- case header.ICMPv6TimeExceeded:
+ case header.ICMPv4SrcQuench:
+ icmpType = "source quench"
+ case header.ICMPv4Redirect:
+ icmpType = "redirect"
+ case header.ICMPv4Echo:
+ icmpType = "echo"
+ case header.ICMPv4TimeExceeded:
icmpType = "time exceeded"
- case header.ICMPv6ParamProblem:
+ case header.ICMPv4ParamProblem:
icmpType = "param problem"
- case header.ICMPv6EchoRequest:
- icmpType = "echo request"
- case header.ICMPv6EchoReply:
- icmpType = "echo reply"
- case header.ICMPv6RouterSolicit:
- icmpType = "router solicit"
- case header.ICMPv6RouterAdvert:
- icmpType = "router advert"
- case header.ICMPv6NeighborSolicit:
- icmpType = "neighbor solicit"
- case header.ICMPv6NeighborAdvert:
- icmpType = "neighbor advert"
- case header.ICMPv6RedirectMsg:
- icmpType = "redirect message"
+ case header.ICMPv4Timestamp:
+ icmpType = "timestamp"
+ case header.ICMPv4TimestampReply:
+ icmpType = "timestamp reply"
+ case header.ICMPv4InfoRequest:
+ icmpType = "info request"
+ case header.ICMPv4InfoReply:
+ icmpType = "info reply"
}
- log.Infof("%s %s %v -> %v %s len:%d id:%04x code:%d", prefix, transName, src, dst, icmpType, size, id, icmp.Code())
- return
+ }
+ log.Infof("%s %s %v -> %v %s len:%d id:%04x code:%d", prefix, transName, src, dst, icmpType, size, id, icmp.Code())
+ return
- case header.UDPProtocolNumber:
- transName = "udp"
- udp := header.UDP(pkt.TransportHeader)
- if fragmentOffset == 0 && len(udp) >= header.UDPMinimumSize {
- srcPort = udp.SourcePort()
- dstPort = udp.DestinationPort()
- details = fmt.Sprintf("xsum: 0x%x", udp.Checksum())
- size -= header.UDPMinimumSize
+ case header.ICMPv6ProtocolNumber:
+ transName = "icmp"
+ icmp := header.ICMPv6(b)
+ icmpType := "unknown"
+ switch icmp.Type() {
+ case header.ICMPv6DstUnreachable:
+ icmpType = "destination unreachable"
+ case header.ICMPv6PacketTooBig:
+ icmpType = "packet too big"
+ case header.ICMPv6TimeExceeded:
+ icmpType = "time exceeded"
+ case header.ICMPv6ParamProblem:
+ icmpType = "param problem"
+ case header.ICMPv6EchoRequest:
+ icmpType = "echo request"
+ case header.ICMPv6EchoReply:
+ icmpType = "echo reply"
+ case header.ICMPv6RouterSolicit:
+ icmpType = "router solicit"
+ case header.ICMPv6RouterAdvert:
+ icmpType = "router advert"
+ case header.ICMPv6NeighborSolicit:
+ icmpType = "neighbor solicit"
+ case header.ICMPv6NeighborAdvert:
+ icmpType = "neighbor advert"
+ case header.ICMPv6RedirectMsg:
+ icmpType = "redirect message"
+ }
+ log.Infof("%s %s %v -> %v %s len:%d id:%04x code:%d", prefix, transName, src, dst, icmpType, size, id, icmp.Code())
+ return
+
+ case header.UDPProtocolNumber:
+ transName = "udp"
+ udp := header.UDP(b)
+ if fragmentOffset == 0 && len(udp) >= header.UDPMinimumSize {
+ srcPort = udp.SourcePort()
+ dstPort = udp.DestinationPort()
+ details = fmt.Sprintf("xsum: 0x%x", udp.Checksum())
+ size -= header.UDPMinimumSize
+ }
+
+ case header.TCPProtocolNumber:
+ transName = "tcp"
+ tcp := header.TCP(b)
+ if fragmentOffset == 0 && len(tcp) >= header.TCPMinimumSize {
+ offset := int(tcp.DataOffset())
+ if offset < header.TCPMinimumSize {
+ details += fmt.Sprintf("invalid packet: tcp data offset too small %d", offset)
+ break
+ }
+ if offset > len(tcp) && !moreFragments {
+ details += fmt.Sprintf("invalid packet: tcp data offset %d larger than packet buffer length %d", offset, len(tcp))
+ break
}
- case header.TCPProtocolNumber:
- transName = "tcp"
- tcp := header.TCP(pkt.TransportHeader)
- if fragmentOffset == 0 && len(tcp) >= header.TCPMinimumSize {
- offset := int(tcp.DataOffset())
- if offset < header.TCPMinimumSize {
- details += fmt.Sprintf("invalid packet: tcp data offset too small %d", offset)
- break
- }
- if offset > len(tcp) && !moreFragments {
- details += fmt.Sprintf("invalid packet: tcp data offset %d larger than packet buffer length %d", offset, len(tcp))
- break
- }
+ srcPort = tcp.SourcePort()
+ dstPort = tcp.DestinationPort()
+ size -= uint16(offset)
- srcPort = tcp.SourcePort()
- dstPort = tcp.DestinationPort()
- size -= uint16(offset)
-
- // Initialize the TCP flags.
- flags := tcp.Flags()
- flagsStr := []byte("FSRPAU")
- for i := range flagsStr {
- if flags&(1<<uint(i)) == 0 {
- flagsStr[i] = ' '
- }
- }
- details = fmt.Sprintf("flags:0x%02x (%v) seqnum: %v ack: %v win: %v xsum:0x%x", flags, string(flagsStr), tcp.SequenceNumber(), tcp.AckNumber(), tcp.WindowSize(), tcp.Checksum())
- if flags&header.TCPFlagSyn != 0 {
- details += fmt.Sprintf(" options: %+v", header.ParseSynOptions(tcp.Options(), flags&header.TCPFlagAck != 0))
- } else {
- details += fmt.Sprintf(" options: %+v", tcp.ParsedOptions())
+ // Initialize the TCP flags.
+ flags := tcp.Flags()
+ flagsStr := []byte("FSRPAU")
+ for i := range flagsStr {
+ if flags&(1<<uint(i)) == 0 {
+ flagsStr[i] = ' '
}
}
-
- default:
- log.Infof("%s %v -> %v unknown transport protocol: %d", prefix, src, dst, transProto)
- return
+ details = fmt.Sprintf("flags:0x%02x (%v) seqnum: %v ack: %v win: %v xsum:0x%x", flags, string(flagsStr), tcp.SequenceNumber(), tcp.AckNumber(), tcp.WindowSize(), tcp.Checksum())
+ if flags&header.TCPFlagSyn != 0 {
+ details += fmt.Sprintf(" options: %+v", header.ParseSynOptions(tcp.Options(), flags&header.TCPFlagAck != 0))
+ } else {
+ details += fmt.Sprintf(" options: %+v", tcp.ParsedOptions())
+ }
}
+
+ default:
+ log.Infof("%s %v -> %v unknown transport protocol: %d", prefix, src, dst, transProto)
+ return
}
if gso != nil {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 21:06:51 +0000