fix(awg): force rp_filter off per-interface at bring-up#10
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The cascade black-holed at a mid hop whose awg interfaces still had rp_filter=2:
the effective value is max(conf.all, conf.<iface>), and an interface created
before a default-rp_filter relax keeps its inherited value — so relaxing only
`all`/`default` doesn't cover already-up interfaces (cloud-init sets default=0 at
boot, but a node provisioned another way, or before that fix, wouldn't have it).
Now Runtime.Up sets net.ipv4.conf.{all,<iface>}.rp_filter=0 right after
`awg-quick up`, best-effort, for every awg interface (awg0 + inner links). Proven
live: a 3-hop cascade (nyc→lon→fra→ams) egressed at the exit once the mids'
interfaces were relaxed.
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Backstops the cloud-init/netpolicy relax — an already-up awg interface keeps its inherited rp_filter=2, and effective = max(all, iface), so a mid hop black-holed the cascade. Proven live on a 3-hop nyc→lon→fra→ams path.
🤖 Generated with Claude Code