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Enable route and LLE (ndp) caching in TCP/IPv6

Description

Enable route and LLE (ndp) caching in TCP/IPv6

tcp_output.c was using a route on the stack for IPv6, which does not
allow route caching or LLE/ndp caching. Switch to using the route
(v6 flavor) in the in_pcb, which was already present, which caches
both L3 and L2 lookups.

Reviewed by: gnn hiren
MFC after: 2 weeks

Details

Provenance
karelsAuthored on
Reviewer
gnn
Parents
rS316064: Fix build with path names with 'align' or 'nop' in them.
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