Add ipv6_leak.py with solicit_ipv6_leak() — sends ICMPv6 Echo to
ff02::1 on the attacker's iface and returns fe80:: evidence when a
link-local response arrives. Gated on _is_on_link(): skips when
attacker is behind a router (no L2 adjacency).
Add _ipv6_leak_phase() to worker.py (Phase 4 in _probe_cycle).
Phase runs once per attacker IP per cycle (sentinel at port 0 in
ip_probed["ipv6_leak"]) and publishes kind="ipv6_leak" via publish_fn.
Add list_v6_addrs(iface) to network.py: returns [(addr, scope)] for
all IPv6 addresses on an interface, required for source-routing ICMPv6
from the correct link-local address.
networks.list() returns bare objects — Containers is always empty
without a reload(). The active-endpoint guard from the prior commit
never fired because it was checking a stale empty dict.
Docker refuses network removal (403) when containers hold endpoints.
The old IPAM-drift path tried to disconnect+remove even with live
containers — disconnect silently failed, remove raised APIError.
Since DECNET assigns IPs explicitly in compose (never via Docker's
auto-assign pool), an ip_range mismatch on an existing same-driver
network is harmless. Bail out early and attach to the existing network
whenever Containers is non-empty.
The systemd unit grants AmbientCapabilities=CAP_NET_ADMIN so the API
service can program host-side macvlan/ipvlan interfaces without
running as root, but setup_host_macvlan/_ipvlan rejected with euid!=0
before even trying — making web-driven 'decnet deploy' impossible
under the privilege model the unit advertises.
Replace _require_root with _require_net_admin, which reads CapEff
from /proc/self/status and accepts the cap (bit 12) as well as
euid==0. No libcap dep — pure /proc parse.
A prior half-torn-down topology can leave a bridge network alive under
a different name that still owns our intended subnet. Docker then
rejects our create with 'Pool overlaps with other one on this address
space', and the topology deploy fails.
Extend create_bridge_network to sweep any unused bridge whose IPAM
subnet matches the one we're about to claim (skipping networks with
running containers — those are live use).
Adds per-topology compose generation (one Docker bridge network per
LAN, multi-homed bridge deckies, ip_forward sysctl for L3 forwarders)
plus async deploy_topology/teardown_topology in the engine. Leaf-first
teardown via BFS-named LAN reverse sort; partial-state safe on failure.
Two compounding root causes produced the recurring 'Address already in use'
error on redeploy:
1. _ensure_network only compared driver+name; if a prior deploy's IPAM
pool drifted (different subnet/gateway/range), Docker kept handing out
addresses from the old pool and raced the real LAN. Now also compares
Subnet/Gateway/IPRange and rebuilds on drift.
2. A prior half-failed 'up' could leave containers still holding the IPs
and ports the new run wants. Run 'compose down --remove-orphans' as a
best-effort pre-up cleanup so IPAM starts from a clean state.
Also surface docker compose stderr to the structured log on failure so
the agent's journal captures Docker's actual message (which IP, which
port) instead of just the exit code.
The create helpers short-circuited on name alone, so a prior macvlan
deploy left Docker's decnet_lan network in place. A subsequent ipvlan
deploy would no-op the network create, then container attach would try
to add a macvlan port on enp0s3 that already had an ipvlan slave —
EBUSY, agent 500, docker ps empty.
Now: when the existing network's driver disagrees with the requested
one, disconnect any live containers and DROP it before recreating.
Parent-NIC can host one driver at a time.
Also: setup_host_{macvlan,ipvlan} opportunistically delete the opposite
host-side helper so we don't leave cruft across driver swaps.
MACVLAN assigns unique MACs per container; WiFi APs typically reject
frames from unregistered MACs, making deckies unreachable from other
LAN devices. IPvlan L2 shares the host's MAC, so all traffic passes
through the AP normally.
- network.py: add create_ipvlan_network, setup_host_ipvlan,
teardown_host_ipvlan, HOST_IPVLAN_IFACE
- config.py: add ipvlan: bool = False to DecnetConfig (persisted to
state so teardown uses the right driver)
- deployer.py: branch on config.ipvlan for create/setup/teardown
- cli.py: add --ipvlan flag, wire into DecnetConfig
- tests/test_network.py: new test module covering ips_to_range,
create_macvlan/ipvlan, setup/teardown for both drivers
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Subtraction underestimates the required prefix when IPs span a CIDR
boundary (e.g. .110–.119 gave /28 covering only .96–.111, leaving
deckies at .112+ unreachable from the host macvlan route).
XOR correctly finds the highest differing bit, yielding /27 (.96–.127).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
