[netstack3] Packet parsing for GRO flow matching

Bug: 452980285
Change-Id: Iddb076139a71966f0ffd31e221137b906a6a6964
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1797077
Reviewed-by: Jeff Martin <martinjeffrey@google.com>
Reviewed-by: Peter DeLong <pdelong@google.com>
Fuchsia-Auto-Submit: Eric Rinehart <erinehart@google.com>
Commit-Queue: Eric Rinehart <erinehart@google.com>
5 files changed