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func checkUEIPAddress(ueipaddress *ie.UEIPAddressFields, sourceInterface uint8, pdu []byte) (res bool, err error) { |
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var srcpdu net.IP |
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var dstpdu net.IP |
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ueIpAddressIE := ie.NewUEIPAddress(ueipaddress.Flags, ueipaddress.IPv4Address.String(), ueipaddress.IPv6Address.String(), ueipaddress.IPv6PrefixDelegationBits, ueipaddress.IPv6PrefixLength) |
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if waterutil.IsIPv4(pdu) { |
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p := gopacket.NewPacket(pdu, layers.LayerTypeIPv4, gopacket.Default).NetworkLayer().(*layers.IPv4) |
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srcpdu = p.SrcIP |
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dstpdu = p.DstIP |
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} else if waterutil.IsIPv6(pdu) { |
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p := gopacket.NewPacket(pdu, layers.LayerTypeIPv6, gopacket.Default).NetworkLayer().(*layers.IPv6) |
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srcpdu = p.SrcIP |
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dstpdu = p.DstIP |
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} else { |
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return false, fmt.Errorf("PDU is not IPv4 or IPv6") |
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} |
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if ueipaddress == nil { |
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return false, fmt.Errorf("Invalid UE IP Address") |
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} |
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if sourceInterface == ie.SrcInterfaceAccess { |
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// check ip src field |
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if ueIpAddressIE.HasIPv4() && ueipaddress.IPv4Address.Equal(srcpdu) { |
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return true, nil |
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} |
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if ueIpAddressIE.HasIPv6() && ueipaddress.IPv6Address.Equal(srcpdu) { |
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return true, nil |
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} |
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} else { |
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// check ip dst field |
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if ueIpAddressIE.HasIPv4() && ueipaddress.IPv4Address.Equal(dstpdu) { |
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return true, nil |
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} |
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if ueIpAddressIE.HasIPv6() && ueipaddress.IPv6Address.Equal(dstpdu) { |
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return true, nil |
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} |
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} |
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return false, nil |
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} |
Bit 3 – S/D: This bit is only applicable to the UE IP Address IE in the PDI IE. It shall be set to "0" and ignored by the receiver in IEs other than PDI IE. In the PDI IE, if this bit is set to "0", this indicates a Source IP address; if this bit is set to "1", this indicates a Destination IP address.
(TS 29.244 V17.4.0, section 8.2.62 "UE IP Address", p. 279)
Must be tested against:
