mirror of
https://passt.top/passt
synced 2024-12-23 06:05:23 +00:00
463 lines
15 KiB
Diff
463 lines
15 KiB
Diff
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From e1b250fc0b5e377285db5d90476fdd2d63501191 Mon Sep 17 00:00:00 2001
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From: Stefano Brivio <sbrivio@redhat.com>
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Date: Fri, 28 Jan 2022 01:09:23 +0100
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Subject: [PATCH] virtcontainers, agent: Add passt networking model and
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endpoint
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This implements a draft support for user-mode networking using
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passt (https://passt.top), the corresponding networking model
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can be enabled via:
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internetworking_model=passt
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in the [runtime] section of the TOML configuration file.
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The networking endpoint does essentially nothing, other than
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starting and stopping passt as needed: no interfaces are configured,
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qemu connects to passt via UNIX domain socket, the corresponding
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command line option is appended if this networking model is
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selected.
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The passt instance started by the endpoint take cares of forwarding
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traffic back and forth, translating between the L2 frames qemu-side
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and native L4 sockets on the host.
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This network setup doesn't need elevated privileges or any kind of
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capability. However, this patch doesn't implement privileges drop
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as the containerd interface allows only runtimes running as the
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same user to connect to its own UNIX domain socket interface,
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typically root (at least in the case of CRI-O), and root privileges
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might anyway be needed for other purposes (block devices, etc.)
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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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---
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SPDX-FileCopyrightText: 2021-2022 Red Hat GmbH <sbrivio@redhat.com>
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SPDX-License-Identifier: Apache-2.0
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src/agent/src/netlink.rs | 3 +-
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.../kata-containers/govmm/qemu/qemu.go | 23 ++-
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src/runtime/virtcontainers/endpoint.go | 7 +
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src/runtime/virtcontainers/network.go | 24 +++
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src/runtime/virtcontainers/passt_endpoint.go | 156 ++++++++++++++++++
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.../virtcontainers/persist/api/network.go | 5 +
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src/runtime/virtcontainers/qemu_arch_base.go | 11 ++
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7 files changed, 226 insertions(+), 3 deletions(-)
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create mode 100644 src/runtime/virtcontainers/passt_endpoint.go
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diff --git a/src/agent/src/netlink.rs b/src/agent/src/netlink.rs
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index ed071b60..34c6df96 100644
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--- a/src/agent/src/netlink.rs
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+++ b/src/agent/src/netlink.rs
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@@ -312,7 +312,8 @@ impl Handle {
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let list = a.iter().chain(&b);
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for route in list {
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- let link = self.find_link(LinkFilter::Name(&route.device)).await?;
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+ // TODO: "eth0" hardcoded for passt networking model
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+ let link = self.find_link(LinkFilter::Name("eth0")).await?;
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const MAIN_TABLE: u8 = packet::constants::RT_TABLE_MAIN;
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const UNICAST: u8 = packet::constants::RTN_UNICAST;
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diff --git a/src/runtime/vendor/github.com/kata-containers/govmm/qemu/qemu.go b/src/runtime/vendor/github.com/kata-containers/govmm/qemu/qemu.go
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index e57a4b26..1756bdfd 100644
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--- a/src/runtime/vendor/github.com/kata-containers/govmm/qemu/qemu.go
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+++ b/src/runtime/vendor/github.com/kata-containers/govmm/qemu/qemu.go
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@@ -682,6 +682,8 @@ const (
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// VHOSTUSER is a vhost-user port (socket)
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VHOSTUSER NetDeviceType = "vhostuser"
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+
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+ PASST NetDeviceType = "passt"
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)
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// QemuNetdevParam converts to the QEMU -netdev parameter notation
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@@ -709,6 +711,8 @@ func (n NetDeviceType) QemuNetdevParam(netdev *NetDevice, config *Config) string
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log.Fatal("vhost-user devices are not supported on IBM Z")
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}
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return "vhost-user" // -netdev type=vhost-user (no device)
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+ case PASST:
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+ return "socket" // -netdev type=socket,connect=...
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default:
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return ""
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@@ -742,6 +746,8 @@ func (n NetDeviceType) QemuDeviceParam(netdev *NetDevice, config *Config) Device
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log.Fatal("vhost-user devices are not supported on IBM Z")
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}
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return "" // -netdev type=vhost-user (no device)
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+ case PASST:
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+ device = "virtio-net"
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default:
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return ""
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}
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@@ -806,6 +812,8 @@ type NetDevice struct {
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// Transport is the virtio transport for this device.
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Transport VirtioTransport
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+
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+ SocketPath string
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}
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// VirtioNetTransport is a map of the virtio-net device name that corresponds
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@@ -818,6 +826,10 @@ var VirtioNetTransport = map[VirtioTransport]string{
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// Valid returns true if the NetDevice structure is valid and complete.
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func (netdev NetDevice) Valid() bool {
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+ if netdev.Type == PASST {
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+ return true
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+ }
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+
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if netdev.ID == "" || netdev.IFName == "" {
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return false
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}
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@@ -867,7 +879,9 @@ func (netdev NetDevice) QemuDeviceParams(config *Config) []string {
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deviceParams = append(deviceParams, fmt.Sprintf("driver=%s", driver))
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deviceParams = append(deviceParams, fmt.Sprintf("netdev=%s", netdev.ID))
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- deviceParams = append(deviceParams, fmt.Sprintf("mac=%s", netdev.MACAddress))
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+ if netdev.MACAddress != "" {
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+ deviceParams = append(deviceParams, fmt.Sprintf("mac=%s", netdev.MACAddress))
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+ }
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if netdev.Bus != "" {
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deviceParams = append(deviceParams, fmt.Sprintf("bus=%s", netdev.Bus))
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@@ -937,7 +951,12 @@ func (netdev NetDevice) QemuNetdevParams(config *Config) []string {
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netdevParams = append(netdevParams, fmt.Sprintf("fds=%s", strings.Join(fdParams, ":")))
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} else {
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- netdevParams = append(netdevParams, fmt.Sprintf("ifname=%s", netdev.IFName))
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+ if netdev.IFName != "" {
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+ netdevParams = append(netdevParams, fmt.Sprintf("ifname=%s", netdev.IFName))
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+ }
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+ if netdev.SocketPath != "" {
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+ netdevParams = append(netdevParams, fmt.Sprintf("connect=%s", netdev.SocketPath))
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+ }
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if netdev.DownScript != "" {
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netdevParams = append(netdevParams, fmt.Sprintf("downscript=%s", netdev.DownScript))
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}
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diff --git a/src/runtime/virtcontainers/endpoint.go b/src/runtime/virtcontainers/endpoint.go
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index 7786bb3e..e167304a 100644
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--- a/src/runtime/virtcontainers/endpoint.go
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+++ b/src/runtime/virtcontainers/endpoint.go
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@@ -65,6 +65,8 @@ const (
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// IPVlanEndpointType is ipvlan network interface.
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IPVlanEndpointType EndpointType = "ipvlan"
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+
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+ PasstEndpointType EndpointType = "passt"
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)
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// Set sets an endpoint type based on the input string.
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@@ -94,6 +96,9 @@ func (endpointType *EndpointType) Set(value string) error {
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case "ipvlan":
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*endpointType = IPVlanEndpointType
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return nil
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+ case "passt":
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+ *endpointType = PasstEndpointType
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+ return nil
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default:
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return fmt.Errorf("Unknown endpoint type %s", value)
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}
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@@ -118,6 +123,8 @@ func (endpointType *EndpointType) String() string {
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return string(TuntapEndpointType)
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case IPVlanEndpointType:
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return string(IPVlanEndpointType)
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+ case PasstEndpointType:
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+ return string(PasstEndpointType)
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default:
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return ""
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}
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diff --git a/src/runtime/virtcontainers/network.go b/src/runtime/virtcontainers/network.go
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index e6c681da..2de692fe 100644
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--- a/src/runtime/virtcontainers/network.go
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+++ b/src/runtime/virtcontainers/network.go
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@@ -57,6 +57,9 @@ const (
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// NetXConnectNoneModel can be used when the VM is in the host network namespace
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NetXConnectNoneModel
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+ // passt in namespace connecting hypervisor via host sockets
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+ NetXConnectPasstModel
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+
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// NetXConnectInvalidModel is the last item to Check valid values by IsValid()
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NetXConnectInvalidModel
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)
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@@ -73,6 +76,8 @@ const (
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tcFilterNetModelStr = "tcfilter"
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+ passtNetModelStr = "passt"
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+
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noneNetModelStr = "none"
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)
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@@ -85,6 +90,8 @@ func (n *NetInterworkingModel) GetModel() string {
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return macvtapNetModelStr
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case NetXConnectTCFilterModel:
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return tcFilterNetModelStr
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+ case NetXConnectPasstModel:
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+ return passtNetModelStr
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case NetXConnectNoneModel:
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return noneNetModelStr
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}
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@@ -103,6 +110,9 @@ func (n *NetInterworkingModel) SetModel(modelName string) error {
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case tcFilterNetModelStr:
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*n = NetXConnectTCFilterModel
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return nil
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+ case passtNetModelStr:
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+ *n = NetXConnectPasstModel
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+ return nil
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case noneNetModelStr:
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*n = NetXConnectNoneModel
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return nil
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@@ -254,6 +264,8 @@ func getLinkForEndpoint(endpoint Endpoint, netHandle *netlink.Handle) (netlink.L
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link = &netlink.IPVlan{}
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case *TuntapEndpoint:
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link = &netlink.Tuntap{}
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+ case *PasstEndpoint:
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+ return nil, nil
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default:
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return nil, fmt.Errorf("Unexpected endpointType %s", ep.Type())
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}
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@@ -302,6 +314,11 @@ func xConnectVMNetwork(ctx context.Context, endpoint Endpoint, h Hypervisor) err
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span, ctx := networkTrace(ctx, "xConnectVMNetwork", endpoint)
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defer closeSpan(span, err)
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+ if endpoint.Type() == PasstEndpointType {
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+ networkLogger().Info("VM network via passt user-mode networking")
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+ return nil
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+ }
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+
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netPair := endpoint.NetworkPair()
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queues := 0
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@@ -347,6 +364,7 @@ func xDisconnectVMNetwork(ctx context.Context, endpoint Endpoint) error {
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err = untapNetworkPair(ctx, endpoint)
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case NetXConnectTCFilterModel:
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err = removeTCFiltering(ctx, endpoint)
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+ case NetXConnectPasstModel:
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default:
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err = fmt.Errorf("Invalid internetworking model")
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}
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@@ -1095,6 +1113,12 @@ func createEndpoint(netInfo NetworkInfo, idx int, model NetInterworkingModel, li
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// an appropriate EndPoint based on interface type
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// This should be a switch
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+ if model == NetXConnectPasstModel {
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+ networkLogger().Info("creating passt endpoint")
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+ endpoint, err := createPasstNetworkEndpoint(idx)
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+ return endpoint, err
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+ }
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+
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// Check if interface is a physical interface. Do not create
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// tap interface/bridge if it is.
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isPhysical, err := isPhysicalIface(netInfo.Iface.Name)
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diff --git a/src/runtime/virtcontainers/passt_endpoint.go b/src/runtime/virtcontainers/passt_endpoint.go
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new file mode 100644
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index 00000000..7f40135a
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--- /dev/null
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+++ b/src/runtime/virtcontainers/passt_endpoint.go
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@@ -0,0 +1,156 @@
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+// SPDX-License-Identifier: Apache-2.0
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+//
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+// passt_endpoint.go - passt endpoint for Kata Containers: start and stop passt
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+//
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+// Copyright (c) 2021-2022 Red Hat GmbH
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+// Author: Stefano Brivio <sbrivio@redhat.com>
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+
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+package virtcontainers
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+
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+import (
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+ "context"
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+ "fmt"
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+ "os"
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+ "os/exec"
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+ "syscall"
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+
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+ persistapi "github.com/kata-containers/kata-containers/src/runtime/virtcontainers/persist/api"
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+ vcTypes "github.com/kata-containers/kata-containers/src/runtime/virtcontainers/types"
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+)
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+
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+type PasstEndpoint struct {
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+ EndpointType EndpointType
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+ EndpointProperties NetworkInfo
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+ PCIPath vcTypes.PciPath
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+ PasstPID int
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+}
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+
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+func createPasstNetworkEndpoint(idx int) (*PasstEndpoint, error) {
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+ if idx < 0 {
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+ return &PasstEndpoint{}, fmt.Errorf("invalid network endpoint index: %d", idx)
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+ }
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+
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+ cmd := exec.Command("passt",
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+ "-P", fmt.Sprintf("/tmp/kata-passt-%d.pid", idx),
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+ "-s", fmt.Sprintf("/tmp/kata-passt-%d.socket", idx))
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+ err := cmd.Run()
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+ if err != nil {
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+ return &PasstEndpoint{}, fmt.Errorf("passt failed to start: %v", err)
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+ }
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+
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+ in, err := os.Open(fmt.Sprintf("/tmp/kata-passt-%d.pid", idx))
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+ if err != nil {
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+ return &PasstEndpoint{}, fmt.Errorf("Failed to read passt PID: %v", err)
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+ }
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+ defer in.Close()
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+
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+ var pid int
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+ _, err = fmt.Fscanf(in, "%d", &pid)
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+ if err != nil {
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+ return &PasstEndpoint{}, fmt.Errorf("Failed to read passt pid: %v", err)
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+ }
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+
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+ endpoint := &PasstEndpoint{
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+ EndpointType: PasstEndpointType,
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+ PasstPID: pid,
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+ }
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+
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+ return endpoint, nil
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+}
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+
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+func (endpoint *PasstEndpoint) Properties() NetworkInfo {
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+ return endpoint.EndpointProperties
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+}
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+
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+func (endpoint *PasstEndpoint) Type() EndpointType {
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+ return endpoint.EndpointType
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+}
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+
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+// unsupported
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+func (endpoint *PasstEndpoint) HardwareAddr() string {
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+ return "00:11:22:33:44:55"
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+}
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+
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+// unsupported
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+func (endpoint *PasstEndpoint) Name() string {
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+ return ""
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+}
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+
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+// unsupported
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+func (endpoint *PasstEndpoint) NetworkPair() *NetworkInterfacePair {
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+ return nil
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+}
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+
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+// PciPath returns the PCI path of the endpoint.
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+func (endpoint *PasstEndpoint) PciPath() vcTypes.PciPath {
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+ return endpoint.PCIPath
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+}
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+
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+// useless
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+func (endpoint *PasstEndpoint) SetPciPath(pciPath vcTypes.PciPath) {
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+ endpoint.PCIPath = pciPath
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+}
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+
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+func (endpoint *PasstEndpoint) SetProperties(properties NetworkInfo) {
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+ endpoint.EndpointProperties = properties
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+}
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+
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+func (endpoint *PasstEndpoint) Attach(ctx context.Context, s *Sandbox) error {
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+ h := s.hypervisor
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+ if err := xConnectVMNetwork(ctx, endpoint, h); err != nil {
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+ networkLogger().WithError(err).Error("Error attaching passt endpoint")
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+ return err
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+ }
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+
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+ return h.AddDevice(ctx, endpoint, NetDev)
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+}
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+
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+func (endpoint *PasstEndpoint) Detach(ctx context.Context, netNsCreated bool, netNsPath string) error {
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+ syscall.Kill(endpoint.PasstPID, syscall.SIGQUIT)
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+
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+ return nil
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+}
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+
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+func (endpoint *PasstEndpoint) HotAttach(ctx context.Context, h Hypervisor) error {
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+ return fmt.Errorf("HotAttach not supported by PasstEndpoint")
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+}
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+
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+func (endpoint *PasstEndpoint) HotDetach(ctx context.Context, h Hypervisor, netNsCreated bool, netNsPath string) error {
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+ return fmt.Errorf("HotDetatch not supported by PasstEndpoint")
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+}
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+
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+func (endpoint *PasstEndpoint) save() persistapi.NetworkEndpoint {
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+ return persistapi.NetworkEndpoint{
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+ Type: string(endpoint.Type()),
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+
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+ Passt: &persistapi.PasstEndpoint{
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+ PasstPID: endpoint.PasstPID,
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+ },
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+ }
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+}
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+
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+func (endpoint *PasstEndpoint) load(s persistapi.NetworkEndpoint) {
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+ endpoint.EndpointType = PasstEndpointType
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+
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+ if s.Passt != nil {
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+ endpoint.PasstPID = s.Passt.PasstPID
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+ }
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+}
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+
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+// unsupported
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||
|
+func (endpoint *PasstEndpoint) GetRxRateLimiter() bool {
|
||
|
+ return false
|
||
|
+}
|
||
|
+
|
||
|
+func (endpoint *PasstEndpoint) SetRxRateLimiter() error {
|
||
|
+ return fmt.Errorf("rx rate limiter is unsupported for physical endpoint")
|
||
|
+}
|
||
|
+
|
||
|
+// unsupported
|
||
|
+func (endpoint *PasstEndpoint) GetTxRateLimiter() bool {
|
||
|
+ return false
|
||
|
+}
|
||
|
+
|
||
|
+func (endpoint *PasstEndpoint) SetTxRateLimiter() error {
|
||
|
+ return fmt.Errorf("tx rate limiter is unsupported for physical endpoint")
|
||
|
+}
|
||
|
diff --git a/src/runtime/virtcontainers/persist/api/network.go b/src/runtime/virtcontainers/persist/api/network.go
|
||
|
index 51c3aac6..79d77cd9 100644
|
||
|
--- a/src/runtime/virtcontainers/persist/api/network.go
|
||
|
+++ b/src/runtime/virtcontainers/persist/api/network.go
|
||
|
@@ -79,6 +79,10 @@ type VhostUserEndpoint struct {
|
||
|
PCIPath vcTypes.PciPath
|
||
|
}
|
||
|
|
||
|
+type PasstEndpoint struct {
|
||
|
+ PasstPID int
|
||
|
+}
|
||
|
+
|
||
|
// NetworkEndpoint contains network interface information
|
||
|
type NetworkEndpoint struct {
|
||
|
// One and only one of these below are not nil according to Type.
|
||
|
@@ -90,6 +94,7 @@ type NetworkEndpoint struct {
|
||
|
Tap *TapEndpoint `json:",omitempty"`
|
||
|
IPVlan *IPVlanEndpoint `json:",omitempty"`
|
||
|
Tuntap *TuntapEndpoint `json:",omitempty"`
|
||
|
+ Passt *PasstEndpoint `json:",omitempty"`
|
||
|
|
||
|
Type string
|
||
|
}
|
||
|
diff --git a/src/runtime/virtcontainers/qemu_arch_base.go b/src/runtime/virtcontainers/qemu_arch_base.go
|
||
|
index 97cd6eb8..9ace0ace 100644
|
||
|
--- a/src/runtime/virtcontainers/qemu_arch_base.go
|
||
|
+++ b/src/runtime/virtcontainers/qemu_arch_base.go
|
||
|
@@ -615,6 +615,17 @@ func genericNetwork(endpoint Endpoint, vhost, nestedRun bool, index int) (govmmQ
|
||
|
FDs: netPair.VMFds,
|
||
|
VhostFDs: netPair.VhostFds,
|
||
|
}
|
||
|
+ case *PasstEndpoint:
|
||
|
+ d = govmmQemu.NetDevice{
|
||
|
+ Type: govmmQemu.PASST,
|
||
|
+ Driver: govmmQemu.VirtioNet,
|
||
|
+ ID: fmt.Sprintf("network-%d", index),
|
||
|
+ // TODO: Drop hardcoded MAC address, passt endpoint
|
||
|
+ // doesn't need to know it
|
||
|
+ MACAddress: "00:11:22:33:44:55",
|
||
|
+ DisableModern: nestedRun,
|
||
|
+ SocketPath: fmt.Sprintf("/tmp/kata-passt-%d.socket", index),
|
||
|
+ }
|
||
|
default:
|
||
|
return govmmQemu.NetDevice{}, fmt.Errorf("Unknown type for endpoint")
|
||
|
}
|
||
|
--
|
||
|
2.28.0
|
||
|
|