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loader.go
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loader.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// 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 progs
import (
"fmt"
"os"
"path/filepath"
"runtime"
"syscall"
"unsafe"
constdef "github.com/jayanthvn/aws-ebpf-sdk-go-temp/pkg/constants"
"github.com/jayanthvn/aws-ebpf-sdk-go-temp/pkg/logger"
ebpf_maps "github.com/jayanthvn/aws-ebpf-sdk-go-temp/pkg/maps"
"github.com/jayanthvn/aws-ebpf-sdk-go-temp/pkg/utils"
"github.com/vishvananda/netlink"
"golang.org/x/sys/unix"
)
type BpfProgAPIs interface {
PinProg(progFD uint32, pinPath string) error
UnPinProg(pinPath string) error
LoadProg(progMetaData CreateEBPFProgInput) (int, error)
GetProgFromPinPath(pinPath string) (BpfProgInfo, int, error)
GetBPFProgAssociatedMapsIDs(progFD int) ([]uint32, error)
}
var log = logger.Get()
type CreateEBPFProgInput struct {
ProgType string
SubSystem string
SubProgType string
ProgData []byte
LicenseStr string
PinPath string
InsDefSize int
AssociatedMaps map[int]string
}
type BpfProgram struct {
// return program name, prog FD and pinPath
ProgID int
ProgFD int
PinPath string
ProgType string
SubSystem string
SubProgType string
}
type BpfProgInfo struct {
Type uint32
ID uint32
Tag [constdef.BPFTagSize]byte
JitedProgLen uint32
XlatedProgLen uint32
JitedProgInsns uint64
XlatedProgInsns uint64
LoadTime int64
CreatedByUID uint32
NrMapIDs uint32
MapIDs uint64
Name [constdef.BPFObjNameLen]byte
IfIndex uint32
GPLCompatible uint32 `strcut:"bitfield"`
Pad uint32 `strcut:"pad"`
NetnsDev uint64
NetnsIno uint64
NrJitedKsyms uint32
NrJitedFuncLens uint32
JitedKsyms uint64
JitedFuncLens uint64
BTFID uint32
FuncInfoRecSize uint32
FuncInfo uint64
NrFuncInfo uint32
NrLineInfo uint32
LineInfo uint64
JitedLineInfo uint64
NrJitedLineInfo uint32
LineInfoRecSize uint32
JitedLineInfoRecSize uint32
NrProgTags uint32
ProgTags uint64
RunTimeNS uint64
RunCnt uint64
}
type BpfProgAttr struct {
prog_id uint32
next_id uint32
open_flags uint32
}
/*
* struct { anonymous struct used by BPF_OBJ_GET_INFO_BY_FD
* __u32 bpf_fd;
* __u32 info_len;
* __aligned_u64 info;
* } info;
*
*/
type BpfObjGetInfo struct {
bpf_fd uint32
info_len uint32
info uintptr
}
/*
* struct { anonymous struct used by BPF_OBJ_* commands
* __aligned_u64 pathname;
* __u32 bpf_fd;
* __u32 file_flags;
* };
*/
type BpfObjGet struct {
pathname uintptr
bpf_fd uint32
file_flags uint32
}
func MountBpfFS() error {
log.Infof("Let's mount BPF FS")
err := syscall.Mount("bpf", constdef.BPF_DIR_MNT, "bpf", 0, "mode=0700")
if err != nil {
log.Errorf("error mounting bpffs: %v", err)
}
return err
}
func (m *BpfProgram) PinProg(progFD uint32, pinPath string) error {
var err error
if utils.IsfileExists(pinPath) {
log.Infof("Found file %s so deleting the path", pinPath)
err = utils.UnPinObject(pinPath)
if err != nil {
log.Errorf("failed to UnPinObject during pinning")
return err
}
}
err = os.MkdirAll(filepath.Dir(pinPath), 0755)
if err != nil {
log.Infof("error creating directory %q: %v", filepath.Dir(pinPath), err)
return fmt.Errorf("error creating directory %q: %v", filepath.Dir(pinPath), err)
}
_, err = os.Stat(pinPath)
if err == nil {
log.Infof("aborting, found file at %q", pinPath)
return fmt.Errorf("aborting, found file at %q", pinPath)
}
if err != nil && !os.IsNotExist(err) {
log.Infof("failed to stat %q: %v", pinPath, err)
return fmt.Errorf("failed to stat %q: %v", pinPath, err)
}
return utils.PinObject(progFD, pinPath)
}
func (m *BpfProgram) UnPinProg(pinPath string) error {
err := utils.UnPinObject(pinPath)
if err != nil {
log.Errorf("failed to unpin prog")
return err
}
if m.ProgFD <= 0 {
log.Errorf("map FD is invalid or closed %d", m.ProgFD)
return nil
}
return unix.Close(int(m.ProgFD))
}
func (m *BpfProgram) LoadProg(progMetaData CreateEBPFProgInput) (int, error) {
var prog_type uint32
switch progMetaData.ProgType {
case "xdp":
prog_type = uint32(netlink.BPF_PROG_TYPE_XDP)
case "tc_cls":
prog_type = uint32(netlink.BPF_PROG_TYPE_SCHED_CLS)
case "tc_act":
prog_type = uint32(netlink.BPF_PROG_TYPE_SCHED_ACT)
case "kprobe":
prog_type = uint32(netlink.BPF_PROG_TYPE_KPROBE)
case "kretprobe":
prog_type = uint32(netlink.BPF_PROG_TYPE_KPROBE)
case "tracepoint":
prog_type = uint32(netlink.BPF_PROG_TYPE_TRACEPOINT)
default:
prog_type = uint32(netlink.BPF_PROG_TYPE_UNSPEC)
}
logBuf := make([]byte, 65535)
program := netlink.BPFAttr{
ProgType: prog_type,
LogBuf: uintptr(unsafe.Pointer(&logBuf[0])),
LogSize: uint32(cap(logBuf) - 1),
LogLevel: 1,
}
program.Insns = uintptr(unsafe.Pointer(&progMetaData.ProgData[0]))
program.InsnCnt = uint32(len(progMetaData.ProgData) / progMetaData.InsDefSize)
license := []byte(progMetaData.LicenseStr)
program.License = uintptr(unsafe.Pointer(&license[0]))
fd, _, errno := unix.Syscall(unix.SYS_BPF,
uintptr(constdef.BPF_PROG_LOAD),
uintptr(unsafe.Pointer(&program)),
unsafe.Sizeof(program))
runtime.KeepAlive(progMetaData.ProgData)
runtime.KeepAlive(license)
log.Infof("Load prog done with fd : %d", int(fd))
if errno != 0 {
log.Errorf(string(logBuf))
return -1, errno
}
//Pin the prog
err := m.PinProg(uint32(fd), progMetaData.PinPath)
if err != nil {
log.Errorf("pin prog failed %v", err)
return -1, err
}
return int(fd), nil
}
func (attr *BpfProgAttr) isBpfProgGetNextID() bool {
ret, _, errno := unix.Syscall(
unix.SYS_BPF,
uintptr(constdef.BPF_PROG_GET_NEXT_ID),
uintptr(unsafe.Pointer(attr)),
unsafe.Sizeof(*attr),
)
if errno != 0 {
log.Errorf("done get_next_id for Prog - ret %d and err %s", int(ret), errno)
return false
}
attr.prog_id = attr.next_id
return true
}
func (attr *BpfProgAttr) BpfProgGetFDbyID() (int, error) {
ret, _, errno := unix.Syscall(
unix.SYS_BPF,
uintptr(constdef.BPF_PROG_GET_FD_BY_ID),
uintptr(unsafe.Pointer(attr)),
unsafe.Sizeof(*attr),
)
if errno != 0 {
log.Errorf("failed to get Prog FD - ret %d and err %s", int(ret), errno)
return 0, errno
}
return int(ret), nil
}
func (objattr *BpfObjGetInfo) BpfGetProgramInfoForFD() error {
ret, _, errno := unix.Syscall(
unix.SYS_BPF,
uintptr(constdef.BPF_OBJ_GET_INFO_BY_FD),
uintptr(unsafe.Pointer(objattr)),
unsafe.Sizeof(*objattr),
)
if errno != 0 {
log.Errorf("failed to get object info by FD - ret %d and err %s", int(ret), errno)
return errno
}
return nil
}
func GetBPFprogInfo(progFD int) (BpfProgInfo, error) {
var bpfProgInfo BpfProgInfo
objInfo := BpfObjGetInfo{
bpf_fd: uint32(progFD),
info_len: uint32(unsafe.Sizeof(bpfProgInfo)),
info: uintptr(unsafe.Pointer(&bpfProgInfo)),
}
err := objInfo.BpfGetProgramInfoForFD()
if err != nil {
log.Errorf("failed to get program Info for FD - ", progFD)
return BpfProgInfo{}, err
}
log.Infof("TYPE - %d", bpfProgInfo.Type)
log.Infof("Prog Name - %s", string(bpfProgInfo.Name[:]))
log.Infof("Maps linked - %d", bpfProgInfo.NrMapIDs)
return bpfProgInfo, nil
}
func (m *BpfProgram) GetBPFProgAssociatedMapsIDs(progFD int) ([]uint32, error) {
bpfProgInfo, err := GetBPFprogInfo(progFD)
if bpfProgInfo.NrMapIDs <= 0 {
return nil, nil
}
numMaps := bpfProgInfo.NrMapIDs
associatedMaps := make([]uint32, numMaps)
newBpfProgInfo := BpfProgInfo{
NrMapIDs: numMaps,
MapIDs: uint64(uintptr(unsafe.Pointer(&associatedMaps[0]))),
}
objInfo := BpfObjGetInfo{
bpf_fd: uint32(progFD),
info_len: uint32(unsafe.Sizeof(newBpfProgInfo)),
info: uintptr(unsafe.Pointer(&newBpfProgInfo)),
}
err = objInfo.BpfGetProgramInfoForFD()
if err != nil {
log.Errorf("failed to get program Info for FD - ", progFD)
return nil, err
}
return associatedMaps, nil
}
func BpfGetMapInfoFromProgInfo(progFD int, numMaps uint32) ([]ebpf_maps.BpfMapInfo, []int, error) {
associatedMaps := make([]uint32, numMaps)
newBpfProgInfo := BpfProgInfo{
NrMapIDs: numMaps,
MapIDs: uint64(uintptr(unsafe.Pointer(&associatedMaps[0]))),
}
objInfo := BpfObjGetInfo{
bpf_fd: uint32(progFD),
info_len: uint32(unsafe.Sizeof(newBpfProgInfo)),
info: uintptr(unsafe.Pointer(&newBpfProgInfo)),
}
err := objInfo.BpfGetProgramInfoForFD()
if err != nil {
log.Errorf("failed to get program Info for FD - ", progFD)
return nil, nil, err
}
log.Infof("TYPE - %d", newBpfProgInfo.Type)
log.Infof("Prog Name - %s", unix.ByteSliceToString(newBpfProgInfo.Name[:]))
log.Infof("Maps linked - %d", newBpfProgInfo.NrMapIDs)
//Printing associated maps
loadedMaps := []ebpf_maps.BpfMapInfo{}
loadedMapsIDs := make([]int, 0)
for mapIdx := 0; mapIdx < len(associatedMaps); mapIdx++ {
log.Infof("MAP ID - %d", associatedMaps[mapIdx])
mapfd, err := utils.GetMapFDFromID(int(associatedMaps[mapIdx]))
if err != nil {
log.Errorf("failed to get map Info")
return nil, nil, err
}
log.Infof("Creating temporary map FD - %d", mapfd)
bpfMapInfo, err := ebpf_maps.GetBPFmapInfo(mapfd)
if err != nil {
log.Errorf("failed to get map Info for FD", mapfd)
return nil, nil, err
}
log.Infof("Closing map FD %d", mapfd)
unix.Close(mapfd)
loadedMaps = append(loadedMaps, bpfMapInfo)
loadedMapsIDs = append(loadedMapsIDs, int(associatedMaps[mapIdx]))
}
return loadedMaps, loadedMapsIDs, nil
}
func BpfGetAllProgramInfo() ([]BpfProgInfo, error) {
loadedPrograms := []BpfProgInfo{}
attr := BpfProgAttr{}
log.Infof("In get all prog info")
for attr.isBpfProgGetNextID() {
log.Infof("Got ID - %d", attr.next_id)
progfd, err := utils.GetProgFDFromID(int(attr.next_id))
if err != nil {
log.Errorf("failed to get program Info")
return nil, err
}
log.Infof("Found prog FD - %d", progfd)
bpfProgInfo, err := GetBPFprogInfo(progfd)
if err != nil {
log.Errorf("failed to get program Info for FD", progfd)
return nil, err
}
unix.Close(progfd)
loadedPrograms = append(loadedPrograms, bpfProgInfo)
}
log.Infof("Done all prog info!!!")
return loadedPrograms, nil
}
func (attr *BpfObjGet) BpfGetObject() (int, error) {
ret, _, errno := unix.Syscall(
unix.SYS_BPF,
uintptr(constdef.BPF_OBJ_GET),
uintptr(unsafe.Pointer(attr)),
unsafe.Sizeof(*attr),
)
if errno != 0 {
log.Errorf("failed to get Prog FD - ret %d and err %s", int(ret), errno)
return 0, errno
}
return int(ret), nil
}
func (m *BpfProgram) GetProgFromPinPath(pinPath string) (BpfProgInfo, int, error) {
log.Infof("Printing pinpath - %s ", pinPath)
if len(pinPath) == 0 {
return BpfProgInfo{}, -1, fmt.Errorf("invalid pinPath")
}
cPath := []byte(pinPath + "\x00")
objInfo := BpfObjGet{
pathname: uintptr(unsafe.Pointer(&cPath[0])),
}
progFD, err := objInfo.BpfGetObject()
if err != nil {
log.Errorf("failed to get object")
return BpfProgInfo{}, -1, err
}
log.Infof("Got progFD - %d", progFD)
bpfProgInfo, err := GetBPFprogInfo(progFD)
if err != nil {
log.Errorf("failed to get program Info for FD - %d", progFD)
return bpfProgInfo, -1, err
}
return bpfProgInfo, progFD, nil
}