Initial development for veb(4), a lightweight Ethernet bridge for bhyve and vnet jails

Hello net@,

I'm Aaron Espinoza, a 2025 GSoC participant. This past summer, I worked 
on an initial veb(4)-style driver for FreeBSD, and I'd appreciate some 
feedback from the community.

Inspired by OpenBSD's veb(4), veb is a stripped L2 bridge aimed at bhyve 
and vnet jail topologies. It’s not meant to replace if_bridge(4). It 
leaves out features such as STP and pfil, and handles host membership 
through a dedicated vport interface.

Code and docs: https://github.com/Acesp25/freebsd-veb

docs/overview.md is the best starting point for why this driver was 
created, and docs/design.md lists each design decision with its rationale.

I'll be presenting this work at the Fall 2026 Vendor Summit and would 
value the list's feedback beforehand, particularly on:
  - whether this work belongs in the src
  - the implemented approach for vport explicit host membership
  - anything in the design that may look wrong
  - what the best practices are for creating benchmarks against if_bridge(4)

Best regards,
Aaron Espinoza