Support more link-types in packet parsing

[dromniscience]

Question

Hi, when I used pcpp (v24.09) to parse a RawPacket read from a CAIDA trace of link-type C_HDLC (Cisco HDLC), it failed to get any layer but recognized the whole packet as payload. Will pcpp add support for link-type C_HDLC and even more to packet parsing in the future?

I think the reason lies in the function Layer* Packet::createFirstLayer(LinkLayerType linkType) that is invoked when parsing a RawPacket. It only recognizes LINKTYPE_ETHERNET, LINKTYPE_LINUX_SLL, LINKTYPE_LINUX_SLL2, LINKTYPE_NULL, LINKTYPE_RAW, LINKTYPE_DLT_RAW1, LINKTYPE_DLT_RAW2, LINKTYPE_IPV4, LINKTYPE_IPV6, LINKTYPE_NFLOG so far. Besides, the current document does not seem to mention supported link types in packet parsing (or not in a obvious place).

Operating systems

Linux

[seladb]

@dromniscience Cisco HDLC is not currently supported, but maybe you can consider adding support for it?

[dromniscience]

@seladb Sure, I'll do it in my spare time.