IPv6 router component specification

Root specification

Purpose

Each IPv6 router maps one public IPv6 block to the WG Mesh addresses of one region. See the overview.

Layout

bpf/          tc eBPF program: address.h, packet.h, router.c
nftables/     Forward filter template
systemd/      Service unit
setup.sh      Installer

Interfaces

• setup.sh reads REGION_ID and PUBLIC_IPV6_PREFIX.
• The host part layout in bpf/address.h must match atlas/service/core/ipv6_router/address.py.

Ownership

Atlas owns the router VM, the block, and the gateway routes of each VM. The router owns only the translation.

Validation

Compile the program with a test config.h:

clang -O2 -g -Wall -Werror -I<directory with config.h> -I/usr/include/$(uname -m)-linux-gnu -target bpf -c bpf/router.c -o router.bpf.o