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4b4a0fc35f
IOL runner containers (IOLDockerVM, GNS3_IOL_RUNNER) had no kernel datapath: their guest leg is the runner's AF_UNIX socket pairs, so every link rode the uBridge relay. Their Ethernet bays now own persistent TAP anchors (gx names, the iol_docker key of the shared naming contract — born at node start like IOU's, before any link, so the switch fast path's deferred join can never miss them), and the per-port bridge's topology leg swaps between UDP (relay) and the anchor (kernel link) through the frozen stop -> delete -> add -> start contract — the unix binding never re-binds across a swap. - iol_docker_vm: KernelDatapathMixin hooks, the anchor lifecycle (_prepare_tap_datapath at _start_ubridge: probe ubridge_bridge_tap + ubridge_tap, sweep leftover, tap create born down), the kernel attach (ensure-then-add — tap create is strictly create-only, IFF_TUN_EXCL, so the ensure checks /sys/class/net first: an unconditional create answers EBUSY on the device the start loop just made), the release (port bridge stop + delete_nio_tap before the shared teardown) and the stop order the fd holders dictate (port bridges first, then tap delete, then the per-link bridges — all before the hypervisor stops). - vendor_docker_vm: the port-bridge creation factored into _ensure_unix_port_bridge (idempotent on the registered name), keeping the NIOBridge rejection for the generic unix-socket containers. - docker_vm: the three _kernel_veths lookups go through the _kernel_host_ifc hook — behavior-identical for DockerVM, and it is what lets the subclass route without overriding the binding methods. - kernel_anchor: the iol_docker key (gx) and kernel_anchor_type, the controller-side mapping for naming an IOL runner's anchor on the switch fast path (the marker check stays inline: this module sits below everything and must not import the controller package).
85 lines
3.4 KiB
Python
85 lines
3.4 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: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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The kernel-datapath anchor naming contract (shared by the compute classes
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that create anchors and the controller that names a peer's anchor for an
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Ethernet-switch link), plus the cascade veth naming for switch-to-switch
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links.
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"""
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from gns3server.utils.kernel_anchor import anchor_suffix, kernel_anchor_name, kernel_anchor_type, kernel_cascade_names
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NODE_ID = "00010203-0405-0607-0809-0a0b0c0d0e0f"
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LINK_ID = "1a2b3c4d-5e6f-4a5b-8c9d-0e1f2a3b4c5d"
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def test_every_node_type_has_its_own_prefix():
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assert kernel_anchor_name("docker", NODE_ID, 0, 0) == "gv00010203e0p0"
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assert kernel_anchor_name("qemu", NODE_ID, 1, 2) == "gq00010203e1p2"
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assert kernel_anchor_name("iou", NODE_ID, 0, 3) == "gi00010203e0p3"
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assert kernel_anchor_name("dynamips", NODE_ID, 6, 48) == "gd00010203e6p48"
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assert kernel_anchor_name("iol_docker", NODE_ID, 0, 0) == "gx00010203e0p0"
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def test_anchor_type_keys_iol_runner_containers_apart():
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"""
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IOL runner containers are Docker nodes whose anchors are persistent TAPs,
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not veth host ends — their own key keeps the gv namespace free of TAPs.
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The marker check must ignore a mere mention of the knob and survive a
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multi-line environment.
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"""
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assert kernel_anchor_type("docker", "GNS3_IOL_RUNNER=1") == "iol_docker"
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assert kernel_anchor_type("docker", "GNS3_IOL_STARTUP_CONFIG=cfg.txt\nGNS3_IOL_RUNNER=1") == "iol_docker"
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assert kernel_anchor_type("docker") == "docker"
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assert kernel_anchor_type("docker", "GNS3_UNIX_SOCKET_NIO=1") == "docker"
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assert kernel_anchor_type("qemu") == "qemu"
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def test_unknown_node_types_have_no_anchor():
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assert kernel_anchor_name("ethernet_switch", NODE_ID, 0, 0) is None
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assert kernel_anchor_name("vpcs", NODE_ID, 0, 0) is None
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def test_names_fit_ifnamsiz():
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# worst case: WIC port numbers reach 48 with the longest prefix
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assert len(kernel_anchor_name("dynamips", NODE_ID, 6, 48)) <= 15
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def test_suffix_is_stable_across_the_node_type():
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assert anchor_suffix(NODE_ID, 1, 2) == "00010203e1p2"
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assert kernel_anchor_name("docker", NODE_ID, 1, 2) == "gv" + anchor_suffix(NODE_ID, 1, 2)
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def test_cascade_names_are_a_pair_of_distinct_sides():
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end0, end1 = kernel_cascade_names(LINK_ID)
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assert end0 == "gs1a2b3c4d5e0"
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assert end1 == "gs1a2b3c4d5e1"
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assert end0 != end1
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def test_cascade_names_fit_ifnamsiz():
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for end in kernel_cascade_names(LINK_ID):
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assert len(end) <= 15
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def test_cascade_names_stay_out_of_the_node_anchor_namespace():
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# "gs" cannot collide with any node anchor prefix (gv/gq/gi/gd/gx), so a
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# cascade end is never mistaken for another node's anchor
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for end in kernel_cascade_names(LINK_ID):
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assert not any(end.startswith(prefix) for prefix in ("gv", "gq", "gi", "gd", "gx"))
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