3f6dfd3e88
bird: add source address + next hop self (v6 anycast fix)
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Build flock Image / build (push) Has been cancelled
Cisco IOS rejects IPv6 BGP advertisements whose next-hop is link-local-
only. BIRD2 was synthesising a link-local next-hop for kernel-learned
routes whose dev had no via gateway (our anycast /128s). Symptom: v4
anycast worked (Cisco doesn't have the same constraint for /32s), v6
anycast didn't make it past crt001.
- pkg/routing/bird/config.go: NodeBGP.LocalV6/LocalV4. Template now
emits `local <addr> as <asn>` and `next hop self;` in the BGP
channel for both families, mirroring Calico's `source address` +
`next hop self` pattern.
- pkg/agent/bird.go: localAddrSameSubnet picks an interface address
on the peer's /64 or /24 to use as source.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com >
2026-04-25 07:45:51 -05:00
eb1f5e0d8d
M2: netlink, IPAM/handler wiring, BIRD sidecar, CNI installer
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Build flock Image / build (push) Has been cancelled
Code (Linux build, with no-op stubs for macOS dev):
- pkg/agent/netns_linux.go: ensureVeth → host-side configure (addrgenmode
none, fe80::1/64, proxy_arp, forwarding) → move peer to pod ns →
configure pod side (addr, default route via fe80::1, v4 169.254.1.1
on-link gateway) → host /128 + /32 routes. Idempotent.
- pkg/agent/hostiface.go: deterministic host iface name flock<8hex> from
FNV-1a-32(containerID).
- pkg/agent/annotations.go: parse flock.fritzlab.net/{ipv6,ipv4,cidr6,
cidr4,ip-algo,anycast} with design-doc defaults; ParseCNIArgs for the
K8S_POD_* keys kubelet sets.
- pkg/agent/podinfo.go: shared informer scoped to spec.nodeName==NODE,
WaitForPod helper for ADD-vs-informer-sync race.
- pkg/agent/handlers.go: PodHandler does
cache lookup → annotations → IPAM → store(pending) → SetupFunc →
store(committed) → Result. Idempotent on retry. Del symmetric.
- pkg/routing/bird/config.go: text/template render with stable ordering;
golden tests for host001 + anycast injection + sort stability.
- pkg/agent/bird.go: writes /etc/flock/bird/bird.conf, debounces 500ms,
execs `birdc -s /run/flock/bird.ctl configure`. Installs blackhole
kernel routes for the node summary CIDRs so BIRD's protocol kernel
imports them.
- pkg/agent/runtime_linux.go: at startup, waits up to 60s for the per-
node NodeConfig, reconciles committed allocations into IPAM.used,
garbage-collects pending entries, builds PodHandler, swaps RPC
handlers in.
- cmd/flock-installer: init-container binary that copies /opt/cni/bin/
flock and writes 01-flock.conflist (lex-first so kubelet picks it
over Calico's 10-calico.conflist on flock-labeled nodes).
Deploy:
- Dockerfile: alpine + iproute2 + bird2; multi-binary image.
- deploy/daemonset.yaml: install-cni init container; bird sidecar
sharing /etc/flock/bird + /run/flock with the agent; ConfigMap-seeded
bootstrap bird.conf so the sidecar boots before the agent renders.
Privileged on flock-agent + install-cni; bird sidecar uses
NET_ADMIN/RAW only.
- RBAC: pods + networkpolicies get/list/watch (the latter is reserved
for M8 — harmless to grant now).
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com >
2026-04-24 22:33:48 -05:00
Donavan Fritz