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https://github.com/GNS3/gns3-server.git
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aaabf0409d
Two real IOU routers on a real L3 image (the image's own IOL fabric, the real IOS CLI on the server's telnet console), driving the anchor TAPs the kernel datapath builds on: anchors born with the node (one per Ethernet bay/unit), real ICMP through the [fabric <-> TAP] port bridge, netem delay, suspend, capture, link delete/re-create, node stop/start rewiring, the serial link staying on the relay (serial bays never anchor) and a relay negative control on an isolated instance. Every scenario ends with no anchors, bridges or tmpdirs left behind. harness: create_iou_node/iou_images/iou_anchor_name, and the IOS console helper is now ios_console (dynamips, IOU and the IOL containers share it).
293 lines
13 KiB
Python
293 lines
13 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 IOU node's kernel datapath (pytest marker
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``e2e``): two real IOU routers (a real IOU image executed by the local
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compute, the real IOS CLI behind the server's telnet console), driven
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through the controller REST API. IOU has no host interface of its own: the
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guest leg is the IOL fabric unix socket, and the kernel datapath buys the
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*link segment* — one persistent anchor TAP per Ethernet bay/unit, a per-link
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Linux bridge, kernel filters, suspend and capture.
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* two IOU nodes on one compute report ``kernel_datapath`` when the compute's
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uBridge can terminate an IOL port on a persistent TAP
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(``ubridge_iol_tap``); the anchors (``gi`` TAPs, one per Ethernet
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bay/unit) exist from node start, before any link — and the per-link
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bridge enslaves exactly the two of them;
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* real ICMP crosses the [IOL fabric ↔ TAP] port bridge;
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* a ``delay 100`` filter lands as netem on both anchors, RTT grows ~200 ms;
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* suspend admin-downs the anchor and kills the traffic; resume restores;
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* a serial link between the same nodes never anchors (per-port exclusion):
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it stays on the relay, ``kernel_datapath`` is False, and real traffic
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still crosses it;
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* link delete releases the port bridge's TAP leg and the anchor survives —
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re-creating the link swaps the leg back in and the traffic returns;
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* node stop tears the anchors down (uBridge holds their fds — the IOL
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bridge goes first, then ``tap delete``); a restart recreates the whole
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wiring from the NIO;
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* deleting the project leaves no anchors and no bridges behind.
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``test_iou_relay_control`` is the negative control on an isolated
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relay-configured instance: the same topology rides the fabric socket ↔ UDP
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relay (no per-link bridge, nothing enslaved) 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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# Ethernet0/0 is (bay 0, unit 0) — one adapter = four units. The adapter
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# index runs over Ethernet and serial bays together, so with two Ethernet
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# adapters the serial bays are 2 and 3: Serial2/0 is (2, 0).
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ETH = (0, 0)
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SERIAL = (2, 0)
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BOOT_TIMEOUT = 360
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# L3 images only: an L2 switching image does not take an address on its
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# switchports. The first is the image the kernel datapath was validated
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# with, the second the matching 17.15 build.
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IMAGE_PREFERENCE = ("x86_64_crb_linux-adventerprisek9-ms.iol", "l3-adventerprisek9-ms-17.15.01.bin")
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def _pick_image(server):
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images = server.compute.iou_images()
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for name in IMAGE_PREFERENCE:
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if name in images:
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return name
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l3 = next((name for name in images if "adventerprisek9" in name and "l2" not in name.lower()), None)
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if not l3:
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pytest.skip(f"no L3 IOU image available on this server (images: {images[:5]})")
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return l3
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def _boot(server, project_id, node_id, timeout=BOOT_TIMEOUT):
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console = harness.ios_console(server, project_id, node_id)
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console.boot_wait(timeout=timeout)
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return console
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def test_iou_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_iol_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 IOU anchor lifecycle "
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f"(ubridge_iol_tap={caps.get('ubridge_iol_tap')}, ubridge_tap={caps.get('ubridge_tap')})"
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)
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image = _pick_image(server)
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project = compute.create_project("iou-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 = compute.create_iou_node(pid, "E2E-R1", image)
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n2 = compute.create_iou_node(pid, "E2E-R2", image)
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n1_id, n2_id = n1["node_id"], n2["node_id"]
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a1 = harness.iou_anchor_name(n1_id, *ETH)
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a2 = harness.iou_anchor_name(n2_id, *ETH)
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# The link is created while both nodes are stopped: the kernel NIO
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# is bound with no anchors in existence yet and wired by node start
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# (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(f".. starting routers on {image} and waiting for IOS 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: the anchors are one persistent TAP per Ethernet
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# bay/unit, born with the node (all eight — the IOU port model),
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# and the per-link bridge has exactly the two addressed ports.
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for adapter in range(2):
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for port in range(4):
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name = harness.iou_anchor_name(n1_id, adapter, port)
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assert harness.tap_exists(name), name
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assert harness.tap_exists(a2), 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 [IOL fabric <-> TAP] port bridge")
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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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# 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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# 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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# serial link between the same nodes: per-port exclusion keeps it on
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# the relay, where the real traffic still crosses (IOU-specific —
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# serial bays never anchor)
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serial = compute.create_link(pid, (n1_id, *SERIAL), (n2_id, *SERIAL))
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assert serial["kernel_datapath"] is False, serial
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harness.configure_ios(c1, "R1", serial_ip="10.2.2.1", serial_if="Serial2/0", clock=True)
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harness.configure_ios(c2, "R2", serial_ip="10.2.2.2", serial_if="Serial2/0")
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relay_ping = harness.wait_ping(c1, "10.2.2.2")
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assert relay_ping["success"] == 100, relay_ping["raw"]
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compute.call("DELETE", f"/projects/{pid}/links/{serial['link_id']}")
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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 fabric
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# socket binding 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 IOL bridge goes
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# first and the taps with it (a stopped node must not litter the
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# host with gi devices); a restart recreates the whole wiring from
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# the NIO that outlived it.
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print(".. stopping and restarting router 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_iou_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 fabric
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socket ↔ UDP relay.
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Anchors DO exist here (an IOU node creates its port TAPs at start
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whenever the uBridge can terminate an IOL port on one); the server
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configuration only decides whether links are attached to them (the same
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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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project = compute.create_project("iou-relay-e2e")
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pid = project["project_id"]
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a1 = None
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try:
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n1 = compute.create_iou_node(pid, "E2E-R1", image)
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n2 = compute.create_iou_node(pid, "E2E-R2", image)
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n1_id, n2_id = n1["node_id"], n2["node_id"]
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a1 = harness.iou_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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print(".. starting routers and waiting for IOS boots (relay)")
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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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# deleting the project closed the nodes: the port TAPs go with them
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assert harness.wait_until(lambda: not harness.tap_exists(a1), timeout=15), a1
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