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https://github.com/GNS3/gns3-server.git
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ff41a54364
The L2-anchor spec's behavioral guarantee — an idle link stays silent for 5 s once the enslavement burst settles — only ran in the Dynamips and Docker suites. It now also runs in QEMU, IOU, the IOL container, the switch fast path and the switch cascade, which covers every host-device creation path: * tap create (Dynamips/QEMU/IOU anchors), docker create_veth (Docker host ends; the cascade's race-loser end is hardened after create by the server), bridge add_nio_tap (the IOL container anchor, the fifth creator), and the brctl switch bridges, whose multicast snooping is off precisely so the bridge role can reach silence; * each scenario silences its guests first (IOS interfaces shut through the console; Docker guests' links down) and re-verifies the ping after; * the cascade measures 8 devices at once (four absorbed router anchors, both cascade ends, both switch bridges). IOL 158 s, cascade 293 s, ESW fast path 378 s, QEMU 428 s, IOU 308 s — all green.
331 lines
15 KiB
Python
331 lines
15 KiB
Python
#
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# Copyright (C) 2026 GNS3 Technologies Inc.
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#
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# This program is free software and is redistributed under the same terms as gns3-server.
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# See the LICENSE file for licensing information.
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#
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"""
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Live end-to-end test for the IOL runner container's kernel datapath (pytest
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marker ``e2e``): two real iol-xe containers (Cisco CML's iol-runner images,
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the real IOS-XE CLI on PID 1 stdio), driven through the controller REST API
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and their telnet consoles. The guest leg stays the runner's unix-socket pair
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— the kernel datapath buys the *link segment*: anchor TAPs, a per-link Linux
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bridge, kernel filters, suspend and capture.
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* two containers on one compute report ``kernel_datapath`` when the compute's
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uBridge has both the tap module and the swappable bridge TAP leg
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(``ubridge_bridge_tap``); the anchors (``gx`` TAPs) exist from node start,
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before any link — and the per-link bridge enslaves exactly the two of them;
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* real ICMP crosses the [unix ↔ TAP] port bridge relay;
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* the L2-anchor spec §E.2 silence window with the guests shut — the
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behavioral half of the hardening on an anchor created by uBridge's
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bridge TAP module;
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* a ``delay 100`` filter lands as netem on both anchors, RTT grows ~200 ms;
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* the classifier spot check on a TAP anchor: ``bpf`` match-drop and the
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eBPF ``frequency_drop`` every-nth mode (the Docker suite runs the full
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matrix on veth host ends);
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* suspend admin-downs the anchor and kills the traffic; resume restores;
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* link delete releases the port bridge's TAP leg (stop → delete_nio_tap) and
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the anchor survives — re-creating the link swaps the leg back in (the
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c-socket binding never re-binds) and the traffic returns;
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* node stop tears the anchors down (uBridge holds their fds — port bridges
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first, then tap delete); a restart recreates the whole wiring from the NIO;
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* deleting the project leaves no anchors and no bridges behind.
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``test_iol_docker_relay_control`` is the negative control on an isolated
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relay-configured instance: the same topology rides unix ↔ UDP through the
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uBridge relay (no anchors ever exist) and still pings.
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"""
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import re
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import time
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import pytest
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from tests.e2e import harness
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pytestmark = pytest.mark.e2e
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# one adapter = one 4-port unit; Ethernet0/0 is (adapter 0, port 0)
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ETH = (0, 0)
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BOOT_TIMEOUT = 360
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def _pick_image(server):
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images = server.compute.docker_images()
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image = next((name for name in images if name.startswith("iol-xe/iol-xe:")), None)
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if not image:
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pytest.skip(f"no iol-xe/iol-xe image available on this server (images: {images[:5]})")
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return image
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def _boot(server, project_id, node_id, timeout=BOOT_TIMEOUT):
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node = server.compute.node(project_id, node_id)
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console = harness.IOSConsole(node["console_host"], node["console"])
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# straight_prompt: IOL boots from its NVRAM startup config straight into
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# the CLI — no "Press RETURN" sentinel on this console
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console.boot_wait(timeout=timeout, straight_prompt=True)
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return console
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def _eth_shutdown(console, shut):
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"""Shut/unshut the guest's Ethernet0/0 — the only legitimate speaker on
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the link segment (the IOL instance's own chatter) — for §E.2's silence
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window; the address stays configured and answers once it is back."""
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console.run("conf t")
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console.run("interface Ethernet0/0")
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console.run("shutdown" if shut else "no shutdown")
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console.run("end")
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def _topology(compute, pid, image, name):
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n1 = compute.create_iol_router(pid, f"{name}-1", image)
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n2 = compute.create_iol_router(pid, f"{name}-2", image)
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return n1, n2
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def test_iol_docker_kernel_datapath():
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server = harness.live_server(kernel=True)
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compute = server.compute
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caps = compute.capabilities()
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if caps.get("ubridge_bridge_tap") is not True or caps.get("ubridge_tap") is not True:
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pytest.skip(
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f"this compute's uBridge cannot serve the IOL container anchor lifecycle "
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f"(ubridge_bridge_tap={caps.get('ubridge_bridge_tap')}, ubridge_tap={caps.get('ubridge_tap')})"
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)
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image = _pick_image(server)
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harness.stage_iol_base_config(server)
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project = compute.create_project("iol-e2e")
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pid = project["project_id"]
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a1 = a2 = None
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try:
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n1, n2 = _topology(compute, pid, image, "E2E")
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n1_id, n2_id = n1["node_id"], n2["node_id"]
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a1 = harness.iol_anchor_name(n1_id, *ETH)
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a2 = harness.iol_anchor_name(n2_id, *ETH)
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# The link is created while both containers are stopped: the kernel
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# NIO is bound with no anchors in existence yet and wired by node
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# start (the deferred-wiring path).
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link = compute.create_link(pid, (n1_id, *ETH), (n2_id, *ETH))
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lid = link["link_id"]
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bridge = harness.link_bridge_name(lid)
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assert link["kernel_datapath"] is True, link
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assert not harness.tap_exists(a1), "anchors must not exist before start"
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print(".. starting containers and waiting for IOS-XE boots")
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compute.call("POST", f"/projects/{pid}/nodes/{n1_id}/start")
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compute.call("POST", f"/projects/{pid}/nodes/{n2_id}/start")
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c1 = _boot(server, pid, n1_id)
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c2 = _boot(server, pid, n2_id)
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# Kernel objects: anchors exist (born with the node, before the link
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# was ever wired) and the per-link bridge has exactly the two of them.
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assert harness.tap_exists(a1) and harness.tap_exists(a2), (a1, a2)
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assert harness.bridge_members(bridge) == sorted([a1, a2]), harness.bridge_members(bridge)
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# L2-anchor spec §E.1: anchors and the per-link bridge carry no L3
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# identity (skipped on a uBridge without `link l2only`), and both
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# ports are FORWARDING — the silent-failure guard.
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if harness.l2only_supported():
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harness.assert_pure_l2(a1)
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harness.assert_pure_l2(a2)
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harness.assert_pure_l2(bridge)
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else:
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print(".. uBridge without link l2only: skipping the §E.1 assertions")
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harness.assert_forwarding(a1)
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harness.assert_forwarding(a2)
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harness.configure_ios(c1, "R1", eth_ip="10.1.1.1", eth_if="Ethernet0/0")
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harness.configure_ios(c2, "R2", eth_ip="10.1.1.2", eth_if="Ethernet0/0")
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out = c1.run("show ip int brief")
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assert re.search(r"Ethernet0/0\s+10\.1\.1\.1\s+\S+\s+\S+\s+up\s+up", out), out
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print(".. both routers configured, pinging through the port-bridge swap")
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baseline = harness.wait_ping(c1, "10.1.1.2")
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assert baseline["success"] == 100, baseline["raw"]
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# L2-anchor spec §E.2: with the guests shut the anchors and the
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# per-link bridge stay silent for 5 s. These anchors come from
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# uBridge's bridge TAP module (`bridge add_nio_tap`) — the creator
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# whose missing hardening the spec caught live; this is the
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# behavioral half of that guarantee.
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if harness.l2only_supported():
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for console in (c1, c2):
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_eth_shutdown(console, shut=True)
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harness.assert_idle_silence(a1, a2, bridge)
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for console in (c1, c2):
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_eth_shutdown(console, shut=False)
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assert harness.wait_ping(c1, "10.1.1.2", attempts=5)["success"] == 100
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else:
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print(".. uBridge without link l2only: skipping the §E.2 assertion")
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# delay 100: netem on both anchors (each impairs one direction),
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# one-way ~100 ms => RTT grows by ~200 ms
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {"delay": [100]}})
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assert "netem" in harness.qdiscs(a1) and "netem" in harness.qdiscs(a2), (
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harness.qdiscs(a1),
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harness.qdiscs(a2),
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)
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delayed = harness.wait_ping(c1, "10.1.1.2")
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assert delayed["success"] == 100, delayed["raw"]
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assert delayed["avg"] >= 150, (baseline, delayed)
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {}})
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assert "netem" not in harness.qdiscs(a1), harness.qdiscs(a1)
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fast = harness.wait_ping(c1, "10.1.1.2")
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assert fast["success"] == 100 and fast["avg"] < 50, fast
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# Classifier spot check on the container's TAP anchor (the Docker
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# suite runs the full matrix on veth host ends): cls_bpf match-drop
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# and the eBPF stateful classifier attach to a tun/tap anchor the
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# same way.
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tc_caps = (caps or {}).get("ubridge_tc") or {}
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if tc_caps.get("cbpf"):
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print(".. bpf 'icmp' drops everything on the TAP anchor")
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {"bpf": ["icmp"]}})
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assert "clsact" in harness.qdiscs(a1) and "clsact" in harness.qdiscs(a2), (
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harness.qdiscs(a1),
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harness.qdiscs(a2),
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)
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blocked = harness.ping(c1, "10.1.1.2", repeat=4)
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assert blocked["success"] == 0, blocked["raw"]
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {}})
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assert "clsact" not in harness.qdiscs(a1), harness.qdiscs(a1)
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assert harness.wait_ping(c1, "10.1.1.2")["success"] == 100
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else:
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print(".. uBridge reports no cbpf: skipping the bpf check")
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modes = tc_caps.get("ebpf_modes") or []
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if "nth" in modes:
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print(".. frequency_drop 3 (eBPF nth) on the TAP anchor")
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {"frequency_drop": [3]}})
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nth = harness.ping(c1, "10.1.1.2", repeat=9)
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loss = 100 - nth["success"]
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print(f".. {loss} % round-trip loss")
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# the kernel counts per direction: 1 - (2/3)^2 = 55.6 % round trip
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assert 20 <= loss <= 90, nth["raw"]
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"filters": {}})
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assert harness.wait_ping(c1, "10.1.1.2")["success"] == 100
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else:
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print(".. uBridge reports no eBPF nth: skipping the frequency_drop check")
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# suspend: anchor admin-down (the port bridge's TAP writes fail EIO,
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# nothing comes back); resume restores
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"suspend": True})
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assert not harness.tap_up(a1)
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dead = harness.ping(c1, "10.1.1.2", repeat=3)
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assert dead["success"] == 0, dead["raw"]
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compute.call("PUT", f"/projects/{pid}/links/{lid}", {"suspend": False})
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assert harness.tap_up(a1)
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assert harness.wait_ping(c1, "10.1.1.2")["success"] == 100
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# capture: AF_PACKET on the anchor writes a real pcap
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capture = compute.call("POST", f"/projects/{pid}/links/{lid}/capture/start", {"data_link_type": "DLT_EN10MB"})
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harness.ping(c1, "10.1.1.2")
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time.sleep(1)
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compute.call("POST", f"/projects/{pid}/links/{lid}/capture/stop")
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path = capture["capture_file_path"]
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count, ethertypes = harness.pcap_records(path)
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assert count >= 4, f"{path}: {count} records"
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assert "0800" in ethertypes, (path, ethertypes)
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# delete / re-create the kernel link: the port bridge's TAP leg is
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# released (stop -> delete_nio_tap), the anchor survives (the node
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# owns it), and re-creating swaps the leg back in — the unix binding
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# never re-binds across the churn.
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compute.call("DELETE", f"/projects/{pid}/links/{lid}")
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assert harness.bridge_members(bridge) is None
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assert harness.tap_exists(a1) and harness.tap_exists(a2)
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link = compute.create_link(pid, (n1_id, *ETH), (n2_id, *ETH))
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lid = link["link_id"]
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bridge = harness.link_bridge_name(lid)
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assert link["kernel_datapath"] is True, link
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assert harness.wait_ping(c1, "10.1.1.2", attempts=5)["success"] == 100
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# node stop: uBridge holds the anchor fds, so the port bridges go
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# first and the taps with them (a stopped container must not litter
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# the host with gx devices); a restart recreates the whole wiring
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# from the NIO that outlived it.
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print(".. stopping and restarting container 1")
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compute.call("POST", f"/projects/{pid}/nodes/{n1_id}/stop")
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assert harness.wait_until(lambda: not harness.tap_exists(a1), timeout=15), a1
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# the per-link bridge lost this end's port; it may be gone entirely
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# (both endpoints delete it, last one wins)
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assert harness.bridge_members(bridge) in (None, [a2]), harness.bridge_members(bridge)
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compute.call("POST", f"/projects/{pid}/nodes/{n1_id}/start")
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c1.close()
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c1 = _boot(server, pid, n1_id)
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assert harness.tap_exists(a1)
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assert harness.bridge_members(bridge) == sorted([a1, a2]), harness.bridge_members(bridge)
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harness.configure_ios(c1, "R1", eth_ip="10.1.1.1", eth_if="Ethernet0/0")
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assert harness.wait_ping(c1, "10.1.1.2", attempts=5)["success"] == 100
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c1.close()
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c2.close()
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except BaseException:
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harness.release(server, pid, failed=True)
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raise
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harness.release(server, pid, failed=False)
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# deleting the project closed the nodes: anchors and bridges go with them
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assert harness.wait_until(lambda: not harness.tap_exists(a1) and not harness.tap_exists(a2), timeout=15), (
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a1,
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a2,
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)
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def test_iol_docker_relay_control():
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"""
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Negative control: the same topology with ``enable_kernel_datapath =
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false`` (an isolated instance) wires nothing into the kernel — no
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per-link bridge, no enslavement — and still pings over the unix ↔ UDP
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relay.
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Anchors DO exist here (an IOL container creates its port TAPs at start
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whenever the uBridge tap module and the swappable leg are available);
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the server configuration only decides whether links are attached to
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them (the same semantics as QEMU's and Dynamips' anchors).
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"""
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server = harness.live_server(kernel=False)
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compute = server.compute
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image = _pick_image(server)
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harness.stage_iol_base_config(server)
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project = compute.create_project("iol-relay-e2e")
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pid = project["project_id"]
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n1_id = n2_id = a1 = None
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try:
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n1, n2 = _topology(compute, pid, image, "E2E")
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n1_id, n2_id = n1["node_id"], n2["node_id"]
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a1 = harness.iol_anchor_name(n1_id, *ETH)
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link = compute.create_link(pid, (n1_id, *ETH), (n2_id, *ETH))
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assert link["kernel_datapath"] is False, link
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compute.call("POST", f"/projects/{pid}/nodes/{n1_id}/start")
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compute.call("POST", f"/projects/{pid}/nodes/{n2_id}/start")
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c1 = _boot(server, pid, n1_id)
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c2 = _boot(server, pid, n2_id)
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# no kernel wiring: the anchor (if born) is nobody's bridge port
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assert harness.bridge_members(harness.link_bridge_name(link["link_id"])) is None
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if harness.tap_exists(a1):
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assert not harness.tap_up(a1), a1
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if harness.l2only_supported():
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# the L2 hardening is a creation-time property, not a
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# datapath one: relay anchors are pure L2 too
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harness.assert_pure_l2(a1)
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harness.configure_ios(c1, "R1", eth_ip="10.1.1.1", eth_if="Ethernet0/0")
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harness.configure_ios(c2, "R2", eth_ip="10.1.1.2", eth_if="Ethernet0/0")
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relay_ping = harness.wait_ping(c1, "10.1.1.2")
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assert relay_ping["success"] == 100, relay_ping["raw"]
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c1.close()
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c2.close()
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except BaseException:
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harness.release(server, pid, failed=True)
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raise
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harness.release(server, pid, failed=False)
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