From 373491f5c447f7a5989687f519202d85f6a751e3 Mon Sep 17 00:00:00 2001 From: Sergey Semenov Date: Tue, 14 Jul 2020 12:27:09 +0700 Subject: [PATCH 1/5] Add injectServer chain element Signed-off-by: Sergey Semenov --- go.mod | 7 +- go.sum | 252 ++++++++++++++++++++- pkg/kernel/networkservice/inject/server.go | 121 ++++++++++ pkg/kernel/utils/fs.go | 108 +++++++++ 4 files changed, 484 insertions(+), 4 deletions(-) create mode 100644 pkg/kernel/networkservice/inject/server.go create mode 100644 pkg/kernel/utils/fs.go diff --git a/go.mod b/go.mod index a9d0896a..0ab40125 100644 --- a/go.mod +++ b/go.mod @@ -3,8 +3,11 @@ module github.com/networkservicemesh/sdk-kernel go 1.13 require ( + github.com/golang/protobuf v1.4.2 + github.com/networkservicemesh/api v0.0.0-20200626035416-b2c37e63dc22 + github.com/networkservicemesh/sdk v0.0.0-20200713165129-52bd2e34c31b github.com/pkg/errors v0.9.1 + github.com/sirupsen/logrus v1.6.0 github.com/vishvananda/netlink v1.1.0 - github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df - golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 // indirect + github.com/vishvananda/netns v0.0.0-20200520041808-52d707b772fe ) diff --git a/go.sum b/go.sum index a04c642a..908eda51 100644 --- a/go.sum +++ b/go.sum @@ -1,9 +1,257 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/OneOfOne/xxhash v1.2.3/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/RoaringBitmap/roaring v0.4.23/go.mod h1:D0gp8kJQgE1A4LQ5wFLggQEyvDi06Mq5mKs52e1TwOo= +github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw= +github.com/armon/go-metrics 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v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4= diff --git a/pkg/kernel/networkservice/inject/server.go b/pkg/kernel/networkservice/inject/server.go new file mode 100644 index 00000000..cb4987a4 --- /dev/null +++ b/pkg/kernel/networkservice/inject/server.go @@ -0,0 +1,121 @@ +// +// SPDX-License-Identifier: Apache-2.0 +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at: +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Package inject contains chain element that moves network interface to and from a Client's pod network namespace +package inject + +import ( + "context" + + "github.com/networkservicemesh/sdk-kernel/pkg/kernel/utils" + + "github.com/golang/protobuf/ptypes/empty" + "github.com/networkservicemesh/api/pkg/api/networkservice" + "github.com/networkservicemesh/api/pkg/api/networkservice/mechanisms/kernel" + "github.com/networkservicemesh/sdk/pkg/networkservice/core/next" + "github.com/networkservicemesh/sdk/pkg/tools/log" + "github.com/pkg/errors" + "github.com/vishvananda/netns" + + sdkKernel "github.com/networkservicemesh/sdk-kernel/pkg/kernel" +) + +type injectServer struct { +} + +// NewServer - returns a new networkservice.NetworkServiceServer that moves given network interface into the Client's +// pod network namespace on Request and back to Forwarder's network namespace on Close +func NewServer() networkservice.NetworkServiceServer { + return &injectServer{} +} + +func (a *injectServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { + if request.GetConnection().GetMechanism().GetType() != kernel.MECHANISM { + return next.Server(ctx).Request(ctx, request) + } + + forwarderNetNSHandle, err := netns.Get() + if err != nil { + return nil, errors.Wrapf(err, "Unable to obtain Forwarder's network namespace handle") + } + clientNetNSHandle, err := a.getClientNetNSHandle(request.GetConnection()) + if err != nil { + return nil, errors.Wrapf(err, "Unable to obtain Client's network namespace handle") + } + ifaceName := request.GetConnection().GetMechanism().GetParameters()[kernel.InterfaceNameKey] + if ifaceName == "" { + return nil, errors.New("Virtual function's interface name is not found") + } + + err = a.moveInterfaceToAnotherNamespace(ifaceName, forwarderNetNSHandle, clientNetNSHandle) + if err != nil { + return nil, errors.Wrapf(err, "Unable to move network interface %s into the Client's namespace", ifaceName) + } + log.Entry(ctx).Infof("Moved network interface %s into the Client's namespace for connection %s", ifaceName, request.GetConnection().GetId()) + + return next.Server(ctx).Request(ctx, request) +} + +func (a *injectServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { + if conn.GetMechanism().GetType() != kernel.MECHANISM { + return next.Server(ctx).Close(ctx, conn) + } + + forwarderNetNSHandle, err := netns.Get() + if err != nil { + return nil, errors.Wrapf(err, "Unable to obtain Forwarder's network namespace handle") + } + + clientNetNSHandle, err := a.getClientNetNSHandle(conn) + if err != nil { + return nil, errors.Wrapf(err, "Unable to obtain Client's network namespace handle") + } + + ifaceName := conn.GetMechanism().GetParameters()[kernel.InterfaceNameKey] + if ifaceName == "" { + return nil, errors.New("Virtual function's interface name is not found") + } + + err = a.moveInterfaceToAnotherNamespace(ifaceName, clientNetNSHandle, forwarderNetNSHandle) + if err != nil { + return nil, errors.Wrapf(err, "Unable to move network interface %s into the Forwarder's namespace", ifaceName) + } + log.Entry(ctx).Infof("Moved network interface %s into the Forwarder's namespace for connection %s", ifaceName, conn.GetId()) + + return next.Client(ctx).Close(ctx, conn) +} + +func (a *injectServer) moveInterfaceToAnotherNamespace(ifaceName string, fromNetNS, toNetNS netns.NsHandle) error { + link, err := sdkKernel.FindHostDevice("", ifaceName, fromNetNS) + if err != nil { + return err + } + + err = link.MoveToNetns(toNetNS) + if err != nil { + return errors.Wrapf(err, "Failed to move interface %s to another namespace", ifaceName) + } + + return nil +} + +func (a *injectServer) getClientNetNSHandle(conn *networkservice.Connection) (netns.NsHandle, error) { + clientNetNSInode := conn.GetMechanism().GetParameters()[kernel.NetNSInodeKey] + if clientNetNSInode == "" { + return 0, errors.New("Client's pod net ns inode is not found") + } + + return utils.GetNSHandleFromInode(clientNetNSInode) +} diff --git a/pkg/kernel/utils/fs.go b/pkg/kernel/utils/fs.go new file mode 100644 index 00000000..11c277c1 --- /dev/null +++ b/pkg/kernel/utils/fs.go @@ -0,0 +1,108 @@ +// Copyright (c) 2020 Doc.ai and/or its affiliates. +// +// SPDX-License-Identifier: Apache-2.0 +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at: +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Package utils contains utility methods for Kernel mechanism machinery +package utils + +import ( + "io/ioutil" + "os" + "path" + "strconv" + "strings" + "syscall" + "unicode" + + "github.com/pkg/errors" + "github.com/sirupsen/logrus" + "github.com/vishvananda/netns" +) + +// GetNSHandleFromInode return namespace handler from inode +func GetNSHandleFromInode(inode string) (netns.NsHandle, error) { + /* Parse the string to an integer */ + inodeNum, err := strconv.ParseUint(inode, 10, 64) + if err != nil { + return -1, errors.Errorf("failed parsing inode, must be an unsigned int, instead was: %s", inode) + } + /* Get filepath from inode */ + nsPath, err := ResolvePodNSByInode(inodeNum) + if err != nil { + return -1, errors.Wrapf(err, "failed to find file in /proc/*/ns/net with inode %d", inodeNum) + } + /* Get namespace handler from nsPath */ + return netns.GetFromPath(nsPath) +} + +// GetInode returns Inode for file +func GetInode(file string) (uint64, error) { + fileinfo, err := os.Stat(file) + if err != nil { + return 0, errors.Wrap(err, "error stat file") + } + stat, ok := fileinfo.Sys().(*syscall.Stat_t) + if !ok { + return 0, errors.New("not a stat_t") + } + return stat.Ino, nil +} + +// ResolvePodNSByInode Traverse /proc// files, +// compare their inodes with inode parameter and returns file if inode matches +func ResolvePodNSByInode(inode uint64) (string, error) { + files, err := ioutil.ReadDir("/proc") + if err != nil { + return "", errors.Wrap(err, "can't read /proc directory") + } + + for _, f := range files { + name := f.Name() + if isDigits(name) { + filename := path.Join("/proc", name, "/ns/net") + tryInode, err := GetInode(filename) + if err != nil { + // Just report into log, do not exit + logrus.Errorf("Can't find %s Error: %v", filename, err) + continue + } + if tryInode == inode { + if cmdline, err := GetCmdline(name); err == nil && strings.Contains(cmdline, "pause") { + return filename, nil + } + } + } + } + + return "", errors.New("not found") +} + +// GetCmdline returns /proc//cmdline file content +func GetCmdline(pid string) (string, error) { + data, err := ioutil.ReadFile(path.Clean(path.Join("/proc/", pid, "cmdline"))) + if err != nil { + return "", err + } + return string(data), nil +} + +func isDigits(s string) bool { + for _, c := range s { + if !unicode.IsDigit(c) { + return false + } + } + return true +} From 7803857fb89995defa4f32e5550d501172836381 Mon Sep 17 00:00:00 2001 From: Sergey Semenov Date: Tue, 14 Jul 2020 12:27:39 +0700 Subject: [PATCH 2/5] Fix linter errors Signed-off-by: Sergey Semenov --- pkg/kernel/link.go | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/pkg/kernel/link.go b/pkg/kernel/link.go index 348bfe66..2e782726 100644 --- a/pkg/kernel/link.go +++ b/pkg/kernel/link.go @@ -14,6 +14,7 @@ // See the License for the specific language governing permissions and // limitations under the License. +// Package kernel contains Link representation of network interface package kernel import ( @@ -187,7 +188,7 @@ func searchByPCIAddress(ns netns.NsHandle, name, pciAddress string) (netlink.Lin } netDir := filepath.Join("/sys/bus/pci/devices", pciAddress, "net") - if _, err := os.Lstat(netDir); err != nil { + if _, err = os.Lstat(netDir); err != nil { return nil, errors.Errorf("no net directory under pci device %s: %q", pciAddress, err) } From 2069e1626b2cfee20cfd7d244c6867518d0c1df1 Mon Sep 17 00:00:00 2001 From: Sergey Semenov Date: Tue, 14 Jul 2020 13:13:47 +0700 Subject: [PATCH 3/5] Add ns close Signed-off-by: Sergey Semenov --- pkg/kernel/networkservice/inject/server.go | 46 ++++++++++++---------- 1 file changed, 26 insertions(+), 20 deletions(-) diff --git a/pkg/kernel/networkservice/inject/server.go b/pkg/kernel/networkservice/inject/server.go index cb4987a4..da06fd07 100644 --- a/pkg/kernel/networkservice/inject/server.go +++ b/pkg/kernel/networkservice/inject/server.go @@ -18,6 +18,7 @@ package inject import ( "context" + "runtime" "github.com/networkservicemesh/sdk-kernel/pkg/kernel/utils" @@ -42,21 +43,31 @@ func NewServer() networkservice.NetworkServiceServer { } func (a *injectServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { - if request.GetConnection().GetMechanism().GetType() != kernel.MECHANISM { - return next.Server(ctx).Request(ctx, request) + conn, err := next.Server(ctx).Request(ctx, request) + if err != nil { + return nil, err } + mech := kernel.ToMechanism(conn.GetMechanism()) + + /* Lock the OS thread so we don't accidentally switch namespaces */ + runtime.LockOSThread() + defer runtime.UnlockOSThread() forwarderNetNSHandle, err := netns.Get() if err != nil { return nil, errors.Wrapf(err, "Unable to obtain Forwarder's network namespace handle") } - clientNetNSHandle, err := a.getClientNetNSHandle(request.GetConnection()) + defer func() { _ = forwarderNetNSHandle.Close() }() + + clientNetNSHandle, err := utils.GetNSHandleFromInode(mech.GetNetNSInode()) if err != nil { return nil, errors.Wrapf(err, "Unable to obtain Client's network namespace handle") } - ifaceName := request.GetConnection().GetMechanism().GetParameters()[kernel.InterfaceNameKey] + defer func() { _ = clientNetNSHandle.Close() }() + + ifaceName := mech.GetParameters()[kernel.InterfaceNameKey] if ifaceName == "" { - return nil, errors.New("Virtual function's interface name is not found") + return nil, errors.New("Interface name is not found") } err = a.moveInterfaceToAnotherNamespace(ifaceName, forwarderNetNSHandle, clientNetNSHandle) @@ -69,23 +80,27 @@ func (a *injectServer) Request(ctx context.Context, request *networkservice.Netw } func (a *injectServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { - if conn.GetMechanism().GetType() != kernel.MECHANISM { - return next.Server(ctx).Close(ctx, conn) - } + mech := kernel.ToMechanism(conn.GetMechanism()) + + /* Lock the OS thread so we don't accidentally switch namespaces */ + runtime.LockOSThread() + defer runtime.UnlockOSThread() forwarderNetNSHandle, err := netns.Get() if err != nil { return nil, errors.Wrapf(err, "Unable to obtain Forwarder's network namespace handle") } + defer func() { _ = forwarderNetNSHandle.Close() }() - clientNetNSHandle, err := a.getClientNetNSHandle(conn) + clientNetNSHandle, err := utils.GetNSHandleFromInode(mech.GetNetNSInode()) if err != nil { return nil, errors.Wrapf(err, "Unable to obtain Client's network namespace handle") } + defer func() { _ = clientNetNSHandle.Close() }() ifaceName := conn.GetMechanism().GetParameters()[kernel.InterfaceNameKey] if ifaceName == "" { - return nil, errors.New("Virtual function's interface name is not found") + return nil, errors.New("Interface name is not found") } err = a.moveInterfaceToAnotherNamespace(ifaceName, clientNetNSHandle, forwarderNetNSHandle) @@ -94,7 +109,7 @@ func (a *injectServer) Close(ctx context.Context, conn *networkservice.Connectio } log.Entry(ctx).Infof("Moved network interface %s into the Forwarder's namespace for connection %s", ifaceName, conn.GetId()) - return next.Client(ctx).Close(ctx, conn) + return next.Server(ctx).Close(ctx, conn) } func (a *injectServer) moveInterfaceToAnotherNamespace(ifaceName string, fromNetNS, toNetNS netns.NsHandle) error { @@ -110,12 +125,3 @@ func (a *injectServer) moveInterfaceToAnotherNamespace(ifaceName string, fromNet return nil } - -func (a *injectServer) getClientNetNSHandle(conn *networkservice.Connection) (netns.NsHandle, error) { - clientNetNSInode := conn.GetMechanism().GetParameters()[kernel.NetNSInodeKey] - if clientNetNSInode == "" { - return 0, errors.New("Client's pod net ns inode is not found") - } - - return utils.GetNSHandleFromInode(clientNetNSInode) -} From ada7cab4f59eb3dbe9b347a972a0bc4b1b06429d Mon Sep 17 00:00:00 2001 From: Sergey Semenov Date: Tue, 21 Jul 2020 13:23:48 +0700 Subject: [PATCH 4/5] Call next on return Signed-off-by: Sergey Semenov --- pkg/kernel/networkservice/inject/server.go | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/pkg/kernel/networkservice/inject/server.go b/pkg/kernel/networkservice/inject/server.go index da06fd07..083db3f4 100644 --- a/pkg/kernel/networkservice/inject/server.go +++ b/pkg/kernel/networkservice/inject/server.go @@ -43,11 +43,7 @@ func NewServer() networkservice.NetworkServiceServer { } func (a *injectServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { - conn, err := next.Server(ctx).Request(ctx, request) - if err != nil { - return nil, err - } - mech := kernel.ToMechanism(conn.GetMechanism()) + mech := kernel.ToMechanism(request.GetConnection().GetMechanism()) /* Lock the OS thread so we don't accidentally switch namespaces */ runtime.LockOSThread() From d22f5fb5fc434dde28c90a15e72e023f6f9203a8 Mon Sep 17 00:00:00 2001 From: Sergey Semenov Date: Thu, 23 Jul 2020 12:19:38 +0700 Subject: [PATCH 5/5] Handle error from next (move interface back) Signed-off-by: Sergey Semenov --- pkg/kernel/networkservice/inject/server.go | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/pkg/kernel/networkservice/inject/server.go b/pkg/kernel/networkservice/inject/server.go index 083db3f4..31f5ba6d 100644 --- a/pkg/kernel/networkservice/inject/server.go +++ b/pkg/kernel/networkservice/inject/server.go @@ -43,6 +43,7 @@ func NewServer() networkservice.NetworkServiceServer { } func (a *injectServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { + connID := request.GetConnection().GetId() mech := kernel.ToMechanism(request.GetConnection().GetMechanism()) /* Lock the OS thread so we don't accidentally switch namespaces */ @@ -68,11 +69,19 @@ func (a *injectServer) Request(ctx context.Context, request *networkservice.Netw err = a.moveInterfaceToAnotherNamespace(ifaceName, forwarderNetNSHandle, clientNetNSHandle) if err != nil { - return nil, errors.Wrapf(err, "Unable to move network interface %s into the Client's namespace", ifaceName) + return nil, errors.Wrapf(err, "Failed to move network interface %s into the Client's namespace", ifaceName) } - log.Entry(ctx).Infof("Moved network interface %s into the Client's namespace for connection %s", ifaceName, request.GetConnection().GetId()) + log.Entry(ctx).Infof("Moved network interface %s into the Client's namespace for connection %s", ifaceName, connID) - return next.Server(ctx).Request(ctx, request) + conn, err := next.Server(ctx).Request(ctx, request) + if err != nil { + errMovingBack := a.moveInterfaceToAnotherNamespace(ifaceName, clientNetNSHandle, forwarderNetNSHandle) + if errMovingBack != nil { + log.Entry(ctx).Infof("Failed to move network interface %s into the Forwarder's namespace for connection %s", ifaceName, connID) + } + log.Entry(ctx).Infof("Moved network interface %s into the Forwarder's namespace for connection %s", ifaceName, connID) + } + return conn, err } func (a *injectServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) {