Add UDP matchers.

1 files changed, 92 insertions, 0 deletions

diff --git a/pkg/abi/linux/netfilter.go b/pkg/abi/linux/netfilter.go
index 33fcc6c95..fb4588272 100644
--- a/pkg/abi/linux/netfilter.go
+++ b/pkg/abi/linux/netfilter.go
@@ -340,3 +340,95 @@ func goString(cstring []byte) string {
 	}
 	return string(cstring)
 }
+
+// XTTCP holds data for matching TCP packets. It corresponds to struct xt_tcp
+// in include/uapi/linux/netfilter/xt_tcpudp.h.
+type XTTCP struct {
+	// SourcePortStart specifies the inclusive start of the range of source
+	// ports to which the matcher applies.
+	SourcePortStart uint16
+
+	// SourcePortEnd specifies the inclusive end of the range of source ports
+	// to which the matcher applies.
+	SourcePortEnd uint16
+
+	// DestinationPortStart specifies the start of the destination port
+	// range to which the matcher applies.
+	DestinationPortStart uint16
+
+	// DestinationPortEnd specifies the start of the destination port
+	// range to which the matcher applies.
+	DestinationPortEnd uint16
+
+	// Option specifies that a particular TCP option must be set.
+	Option uint8
+
+	// FlagMask masks the FlagCompare byte when comparing to the TCP flag
+	// fields.
+	FlagMask uint8
+
+	// FlagCompare is binary and-ed with the TCP flag fields.
+	FlagCompare uint8
+
+	// InverseFlags flips the meaning of certain fields. See the
+	// TX_TCP_INV_* flags.
+	InverseFlags uint8
+}
+
+// SizeOfXTTCP is the size of an XTTCP.
+const SizeOfXTTCP = 12
+
+// Flags in XTTCP.InverseFlags. Corresponding constants are in
+// include/uapi/linux/netfilter/xt_tcpudp.h.
+const (
+	// Invert the meaning of SourcePortStart/End.
+	XT_TCP_INV_SRCPT = 0x01
+	// Invert the meaning of DestinationPortStart/End.
+	XT_TCP_INV_DSTPT = 0x02
+	// Invert the meaning of FlagCompare.
+	XT_TCP_INV_FLAGS = 0x04
+	// Invert the meaning of Option.
+	XT_TCP_INV_OPTION = 0x08
+	// Enable all flags.
+	XT_TCP_INV_MASK = 0x0F
+)
+
+// XTUDP holds data for matching UDP packets. It corresponds to struct xt_udp
+// in include/uapi/linux/netfilter/xt_tcpudp.h.
+type XTUDP struct {
+	// SourcePortStart specifies the inclusive start of the range of source
+	// ports to which the matcher applies.
+	SourcePortStart uint16
+
+	// SourcePortEnd specifies the inclusive end of the range of source ports
+	// to which the matcher applies.
+	SourcePortEnd uint16
+
+	// DestinationPortStart specifies the start of the destination port
+	// range to which the matcher applies.
+	DestinationPortStart uint16
+
+	// DestinationPortEnd specifies the start of the destination port
+	// range to which the matcher applies.
+	DestinationPortEnd uint16
+
+	// InverseFlags flips the meaning of certain fields. See the
+	// TX_UDP_INV_* flags.
+	InverseFlags uint8
+
+	_ uint8
+}
+
+// SizeOfXTUDP is the size of an XTUDP.
+const SizeOfXTUDP = 10
+
+// Flags in XTUDP.InverseFlags. Corresponding constants are in
+// include/uapi/linux/netfilter/xt_tcpudp.h.
+const (
+	// Invert the meaning of SourcePortStart/End.
+	XT_UDP_INV_SRCPT = 0x01
+	// Invert the meaning of DestinationPortStart/End.
+	XT_UDP_INV_DSTPT = 0x02
+	// Enable all flags.
+	XT_UDP_INV_MASK = 0x03
+)