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https://github.com/GNS3/gns3-server.git
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0a8d430d50
Impairment filters with a netem equivalent (delay, packet_loss, corrupt) now run on the kernel datapath as one tc netem qdisc per veth host end, pushed through uBridge's netlink tc module (tc netem set / tc reset). This removes the relay delay filter's nanosleep bottleneck (upstream Both link endpoints carry the filters: each end's qdisc egress covers the traffic entering that container, so every direction is impaired exactly once -- the same net effect as the relay, where both directions cross the single filtered bridge. - controller: eligibility keys on relay-only types (frequency_drop, bpf) instead of any filter; kernel links push the real filters (the synthetic suspend frequency_drop no longer flips a suspended link to relay on reopen/reset); update_filters 409s only relay-only types; available_filters hides them on kernel links - compute: create_nio whitelists netem-capable filter types; the NIO update path keeps its own guard (PUT mutates the NIO in place); _ubridge_apply_netem translates the filter dict into one atomic netem-set (full re-apply IS the reconcile); node restart restores the qdisc, link deletion detaches it (the veth survives the link) - e2e (27/27): delay 100 -> 200.2 ms RTT, atomic replace 50 -> 100.2 ms, clear -> baseline, packet_loss 30 -> 48 % round-trip (expected 51 %), suspend/resume and node restart keep the qdisc, link delete leaves no residual impairment
69 lines
1.9 KiB
Python
69 lines
1.9 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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"""
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Interface for kernel-datapath bridge NIOs.
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A NIO of this type instructs the node to enslave its adapter's veth host end
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into the named Linux kernel bridge instead of wiring a uBridge UDP relay.
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Frames then flow entirely in the kernel (veth -> bridge -> veth). Impairment
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filters ride the NIO and run as one tc netem qdisc per veth host end (the
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types without a netem equivalent — frequency_drop, bpf — stay relay-only);
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markers and packet capture are served by uBridge's AF_PACKET modules on the
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veth host end (marker add_kernel / capture start_kernel).
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"""
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from .nio import NIO
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class NIOBridge(NIO):
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"""
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Kernel-bridge NIO.
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:param bridge: name of the per-link Linux kernel bridge
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"""
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def __init__(self, bridge):
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super().__init__()
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self._bridge = bridge
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@property
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def bridge(self):
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"""
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Returns the kernel bridge name.
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:returns: bridge name
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"""
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return self._bridge
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def __str__(self):
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return "NIO bridge"
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def asdict(self):
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return {
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"type": "nio_bridge",
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"bridge": self._bridge,
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"suspend": self._suspended,
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"filters": self._filters,
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"markers": self._markers,
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}
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