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Update gopacket vendor from google to gopacket #43

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xXMarkuski
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Hello,

While playing a recent AD CTF, we used tcpdump to log the network traffic from our vulnbox. When running tcpdump -i any, it outputs packets with the LinkType SLL2 (Linux "cooked" capture encapsulation v2), which is not supported by Google's gopacket library. As a result, Tulip was unable to process the packets.

Since Google's gopacket library hasn't seen any commits in two years, a fork has been created to continue maintaining this library.

Support for SLL2 has been implemented in gopacket and merged into the fork.

This pull request switches the gopacket library to the current fork, adding SLL2 support to Tulip. The change was tested with pcaps.

Best regards
Markus

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