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This change re-adds L2 caching for TCP and UDP, as originally added in D4306

Description

This change re-adds L2 caching for TCP and UDP, as originally added in D4306
but removed due to other changes in the system. Restore the llentry pointer
to the "struct route", and use it to cache the L2 lookup (ARP or ND6) as
appropriate.

Submitted by: Mike Karels
Differential Revision: https://reviews.freebsd.org/D6262

Details

Provenance
gnnAuthored on
Differential Revision
D6262: Implement L2 lookup caching for TCP and UDP
Parents
rS301216: Fix two types which resulted in setting the address long wrong
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