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https://github.com/GNS3/gns3-server.git
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b4e4739d52
Consume uBridge's ebpf_modes contract (feature/tc-window 40c36ae): a
stateful mode is usable iff ebpf=1 and its token is listed; builds
predating the field keep their shipped modes (nth/quota/flow), so the
pre-correction window semantics can never be installed silently.
- gns3server/utils/tc_capabilities.py: shared reply parser, mode
policy and filter-type mappings (compute and controller gate on the
same rules)
- gns3server/compute/ubridge/tc_probe.py: standalone probe spawning a
throwaway uBridge as the server's own user, cached by binary
identity (path/mtime/size - the version string cannot distinguish
rebuilds); failures cache as unknown
- GET /v3/compute/capabilities gains ubridge_tc {netem, ebpf,
ebpf_modes, cbpf}; the controller forwards it (Compute.capabilities)
and available_filters hides kernel-datapath filter types an endpoint
compute cannot run (both ends apply their own filters, so one
incapable compute hides the type); computes without a report keep
the full list and apply-time 409 stays the guard
- docker: _ubridge_apply_ebpf_drops gates per mode token; the cleanup
path only sends "off" for modes the build declares
- split DockerVM's kernel-datapath machinery (veth lifecycle, carrier,
marker primitives, tc filter translation, kernel NIO teardown) into
compute/docker/docker_kernel_datapath.py (DockerKernelDatapathMixin)
78 lines
2.5 KiB
Python
78 lines
2.5 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 `tc capabilities` reply parser and the eBPF mode policy shared by the
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compute probe and the controller filter availability.
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"""
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from gns3server.utils.tc_capabilities import (
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LEGACY_EBPF_MODES,
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parse_tc_capabilities,
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usable_ebpf_modes,
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)
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def test_parse_full_reply():
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caps = parse_tc_capabilities("netem=delay,jitter,loss;ebpf=1;cbpf=0;ebpf_modes=nth,quota,window,flow")
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assert caps == {
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"netem": "delay,jitter,loss",
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"ebpf": "1",
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"cbpf": "0",
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"ebpf_modes": "nth,quota,window,flow",
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}
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def test_parse_legacy_reply_without_modes():
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"""A build predating the field (and unknown future keys) passes through."""
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caps = parse_tc_capabilities("netem=delay;ebpf=1;cbpf=1")
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assert caps == {"netem": "delay", "ebpf": "1", "cbpf": "1"}
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def test_parse_empty_reply():
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assert parse_tc_capabilities("") == {}
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assert parse_tc_capabilities(None) == {}
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def test_usable_modes_require_ebpf():
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"""The mode list is a build fact; ebpf is the runtime gate for all of them."""
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assert usable_ebpf_modes({"ebpf": "0", "ebpf_modes": "nth,quota,window,flow"}) == ()
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assert usable_ebpf_modes({}) == ()
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def test_usable_modes_from_token_list():
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caps = {"ebpf": "1", "ebpf_modes": "nth,quota,window,flow"}
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assert usable_ebpf_modes(caps) == ("nth", "quota", "window", "flow")
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def test_usable_modes_legacy_build_keeps_shipped_modes():
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"""No field: the modes that shipped before it — everything but window."""
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assert usable_ebpf_modes({"ebpf": "1"}) == LEGACY_EBPF_MODES
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assert "window" not in LEGACY_EBPF_MODES
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def test_window_never_usable_without_token():
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"""The pre-correction build reported ebpf=1 with broken window semantics."""
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assert "window" not in usable_ebpf_modes({"ebpf": "1"})
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assert "window" not in usable_ebpf_modes({"ebpf": "1", "ebpf_modes": "nth,quota"})
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