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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.
76 lines
3.2 KiB
Python
76 lines
3.2 KiB
Python
#
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# Copyright (C) 2020 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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from typing import List, Optional
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from pydantic import BaseModel, Field
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from .nodes import NodeType
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class UbridgeTcCapabilities(BaseModel):
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"""
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uBridge tc-module capabilities (kernel-datapath packet filters), probed
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by the compute as its own user.
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"""
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netem: List[str] = Field(..., description="netem keywords supported by this uBridge's tc module")
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ebpf: bool = Field(..., description="Whether the eBPF stateful classifier loads on this host")
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ebpf_modes: List[str] = Field(
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..., description="eBPF classifier modes usable on this host (ebpf is on and the mode token is declared)"
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)
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cbpf: bool = Field(..., description="Whether classic-BPF match-drop classifiers are available")
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class Capabilities(BaseModel):
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"""
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Capabilities properties.
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"""
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version: str = Field(..., description="Compute version number")
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node_types: List[NodeType] = Field(..., description="Node types supported by the compute")
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platform: str = Field(..., description="Platform where the compute is running")
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cpus: int = Field(..., description="Number of CPUs on this compute")
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memory: int = Field(..., description="Amount of memory on this compute")
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disk_size: int = Field(..., description="Disk size on this compute")
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ubridge_tc: Optional[UbridgeTcCapabilities] = Field(
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None, description="uBridge tc-module capabilities; absent when the probe failed or uBridge has no tc module"
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)
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ubridge_tap: Optional[bool] = Field(
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None,
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description="Whether uBridge can create the persistent TAPs a QEMU adapter anchors on "
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"(needed to wire QEMU links on the kernel datapath); absent when the probe failed",
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)
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ubridge_iol_tap: Optional[bool] = Field(
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None,
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description="Whether uBridge can bind an IOL port to a persistent TAP (iol_bridge add_nio_tap, "
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"the anchor IOU Ethernet ports need to wire IOU links on the kernel datapath); absent when the "
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"probe failed",
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)
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ubridge_bridge_tap: Optional[bool] = Field(
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None,
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description="Whether uBridge's generic bridge module can release a named TAP NIO "
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"(bridge delete_nio_tap, the swappable TAP leg an IOL runner container's per-port bridge "
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"needs to wire its links on the kernel datapath); absent when the probe failed",
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)
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vpcs_tap: Optional[bool] = Field(
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None,
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description="Whether the VPCS binary can anchor a kernel link (tap mode with -n, which "
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"keeps the guest from auto-configuring the host side of the anchor TAP); absent when the "
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"probe failed",
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)
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