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A VPCS node's single adapter anchors on a persistent TAP the server
creates (tap create + set_owner via uBridge) and the vpcs process
attaches to by name: -e -d <gp{id8}e0p0> -n, the same
server-creates/guest-attaches shape as QEMU's netdev. -n (a vpcs fork
feature) keeps the guest's ip command from ifconfig'ing the anchor on
the host; the vpcs build is probed once per binary identity
(vpcs_tap capability, usage scan) and gates kernel links together
with ubridge_tap — anything else keeps the node on the relay (the
legacy local UDP tunnel on a stock binary, an AF_PACKET endpoint on
the anchor with a capable one).
VPCSVM takes KernelDatapathMixin: _connect_nio dispatches kernel
(enslave into the per-link bridge) / relay-on-anchor / legacy,
captures pick capture start_kernel vs the bridge engine, stop runs
under an execute lock and terminates the process before deleting the
anchor TAPs (a held device refuses deletion), and the duplicate-port
guard backstops the controller's. The NIO routes accept nio_bridge
and write suspend back on update.
_delete_anchor_taps verifies each tap is gone from sysfs and retries
a bounded three times: a holder can release its fd a moment after its
process was reaped (vpcs's daemon parent kills its console child and
exits first), so the unconditional delete raced EBUSY and leaked the
anchor intermittently.
The vpcs side needs IFNAMSIZ (16) instead of its own IFNAMESIZ (12)
for the -d name buffer — anchor names are 14 chars and truncated to a
nonexistent device, which TUNSETIFF then tries to create without
CAP_NET_ADMIN (fixed in the vpcs fork).
e2e (tests/e2e/test_vpcs_kernel_datapath.py): kernel and relay
scenarios green against the real binary — real ICMP both ways, §E.1/§
E.2 on the anchors, delay/suspend/capture, link delete/re-create,
node stop/restart self-heal, zero leftovers; the relay control passes
with both the fork binary and a stock one.
89 lines
3.7 KiB
Python
89 lines
3.7 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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assert kernel_anchor_name("vpcs", NODE_ID, 0, 0) == "gp00010203e0p0"
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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", "GNS3_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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# a mid-line mention is not the marker (mirrors _select_node_class)
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assert kernel_anchor_type("docker", "NOTE=GNS3_IOL_RUNNER=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("cloud", 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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