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Implement UDP socket diagnostics 

Signed-off-by: Sven Rebhan <srebhan@influxdata.com>
This commit is contained in:
Sven Rebhan 2023-11-15 15:50:31 +01:00 committed by Alessandro Boch
parent 8d48f50f55
commit 06219cde3e
5 changed files with 166 additions and 30 deletions
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5
inet_diag.go
View File

@ -29,3 +29,8 @@ type InetDiagTCPInfoResp struct {
TCPInfo *TCPInfo
TCPBBRInfo *TCPBBRInfo
}
type InetDiagUDPInfoResp struct {
InetDiagMsg *Socket
Memory *MemInfo
}

152
socket_linux.go
View File

@ -174,8 +174,18 @@ func SocketGet(local, remote net.Addr) (*Socket, error) {
// SocketDiagTCPInfo requests INET_DIAG_INFO for TCP protocol for specified family type and return with extension TCP info.
func SocketDiagTCPInfo(family uint8) ([]*InetDiagTCPInfoResp, error) {
// Construct the request
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: family,
Protocol: unix.IPPROTO_TCP,
Ext: (1 << (INET_DIAG_VEGASINFO - 1)) | (1 << (INET_DIAG_INFO - 1)),
States: uint32(0xfff), // all states
})
// Do the query and parse the result
var result []*InetDiagTCPInfoResp
err := socketDiagTCPExecutor(family, func(m syscall.NetlinkMessage) error {
err := socketDiagExecutor(req, func(m syscall.NetlinkMessage) error {
sockInfo := &Socket{}
if err := sockInfo.deserialize(m.Data); err != nil {
return err
@ -201,8 +211,18 @@ func SocketDiagTCPInfo(family uint8) ([]*InetDiagTCPInfoResp, error) {
// SocketDiagTCP requests INET_DIAG_INFO for TCP protocol for specified family type and return related socket.
func SocketDiagTCP(family uint8) ([]*Socket, error) {
// Construct the request
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: family,
Protocol: unix.IPPROTO_TCP,
Ext: (1 << (INET_DIAG_VEGASINFO - 1)) | (1 << (INET_DIAG_INFO - 1)),
States: uint32(0xfff), // all states
})
// Do the query and parse the result
var result []*Socket
err := socketDiagTCPExecutor(family, func(m syscall.NetlinkMessage) error {
err := socketDiagExecutor(req, func(m syscall.NetlinkMessage) error {
sockInfo := &Socket{}
if err := sockInfo.deserialize(m.Data); err != nil {
return err
@ -216,21 +236,82 @@ func SocketDiagTCP(family uint8) ([]*Socket, error) {
return result, nil
}
// socketDiagTCPExecutor requests INET_DIAG_INFO for TCP protocol for specified family type.
func socketDiagTCPExecutor(family uint8, receiver func(syscall.NetlinkMessage) error) error {
// SocketDiagUDPInfo requests INET_DIAG_INFO for UDP protocol for specified family type and return with extension info.
func SocketDiagUDPInfo(family uint8) ([]*InetDiagUDPInfoResp, error) {
// Construct the request
var extensions uint8
extensions = 1 << (INET_DIAG_VEGASINFO - 1)
extensions |= 1 << (INET_DIAG_INFO - 1)
extensions |= 1 << (INET_DIAG_MEMINFO - 1)
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: family,
Protocol: unix.IPPROTO_UDP,
Ext: extensions,
States: uint32(0xfff), // all states
})
// Do the query and parse the result
var result []*InetDiagUDPInfoResp
err := socketDiagExecutor(req, func(m syscall.NetlinkMessage) error {
sockInfo := &Socket{}
if err := sockInfo.deserialize(m.Data); err != nil {
return err
}
attrs, err := nl.ParseRouteAttr(m.Data[sizeofSocket:])
if err != nil {
return err
}
res, err := attrsToInetDiagUDPInfoResp(attrs, sockInfo)
if err != nil {
return err
}
result = append(result, res)
return nil
})
if err != nil {
return nil, err
}
return result, nil
}
// SocketDiagUDP requests INET_DIAG_INFO for UDP protocol for specified family type and return related socket.
func SocketDiagUDP(family uint8) ([]*Socket, error) {
// Construct the request
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: family,
Protocol: unix.IPPROTO_UDP,
Ext: (1 << (INET_DIAG_VEGASINFO - 1)) | (1 << (INET_DIAG_INFO - 1)),
States: uint32(0xfff), // all states
})
// Do the query and parse the result
var result []*Socket
err := socketDiagExecutor(req, func(m syscall.NetlinkMessage) error {
sockInfo := &Socket{}
if err := sockInfo.deserialize(m.Data); err != nil {
return err
}
result = append(result, sockInfo)
return nil
})
if err != nil {
return nil, err
}
return result, nil
}
// socketDiagExecutor requests diagnoses info from the NETLINK_INET_DIAG socket for the specified request.
func socketDiagExecutor(req *nl.NetlinkRequest, receiver func(syscall.NetlinkMessage) error) error {
s, err := nl.Subscribe(unix.NETLINK_INET_DIAG)
if err != nil {
return err
}
defer s.Close()
req := nl.NewNetlinkRequest(nl.SOCK_DIAG_BY_FAMILY, unix.NLM_F_DUMP)
req.AddData(&socketRequest{
Family: family,
Protocol: unix.IPPROTO_TCP,
Ext: (1 << (INET_DIAG_VEGASINFO - 1)) | (1 << (INET_DIAG_INFO - 1)),
States: uint32(0xfff), // All TCP states
})
s.Send(req)
loop:
@ -240,7 +321,7 @@ loop:
return err
}
if from.Pid != nl.PidKernel {
return fmt.Errorf("Wrong sender portid %d, expected %d", from.Pid, nl.PidKernel)
return fmt.Errorf("wrong sender portid %d, expected %d", from.Pid, nl.PidKernel)
}
if len(msgs) == 0 {
return errors.New("no message nor error from netlink")
@ -263,29 +344,40 @@ loop:
}
func attrsToInetDiagTCPInfoResp(attrs []syscall.NetlinkRouteAttr, sockInfo *Socket) (*InetDiagTCPInfoResp, error) {
var tcpInfo *TCPInfo
var tcpBBRInfo *TCPBBRInfo
info := &InetDiagTCPInfoResp{
InetDiagMsg: sockInfo,
}
for _, a := range attrs {
if a.Attr.Type == INET_DIAG_INFO {
tcpInfo = &TCPInfo{}
if err := tcpInfo.deserialize(a.Value); err != nil {
switch a.Attr.Type {
case INET_DIAG_INFO:
info.TCPInfo = &TCPInfo{}
if err := info.TCPInfo.deserialize(a.Value); err != nil {
return nil, err
}
continue
}
if a.Attr.Type == INET_DIAG_BBRINFO {
tcpBBRInfo = &TCPBBRInfo{}
if err := tcpBBRInfo.deserialize(a.Value); err != nil {
case INET_DIAG_BBRINFO:
info.TCPBBRInfo = &TCPBBRInfo{}
if err := info.TCPBBRInfo.deserialize(a.Value); err != nil {
return nil, err
}
continue
}
}
return &InetDiagTCPInfoResp{
InetDiagMsg: sockInfo,
TCPInfo: tcpInfo,
TCPBBRInfo: tcpBBRInfo,
}, nil
return info, nil
}
func attrsToInetDiagUDPInfoResp(attrs []syscall.NetlinkRouteAttr, sockInfo *Socket) (*InetDiagUDPInfoResp, error) {
info := &InetDiagUDPInfoResp{
InetDiagMsg: sockInfo,
}
for _, a := range attrs {
switch a.Attr.Type {
case INET_DIAG_MEMINFO:
info.Memory = &MemInfo{}
if err := info.Memory.deserialize(a.Value); err != nil {
return nil, err
}
}
}
return info, nil
}

16
socket_test.go
View File

@ -1,3 +1,4 @@
//go:build linux
// +build linux
package netlink
@ -75,3 +76,18 @@ func TestSocketDiagTCPInfo(t *testing.T) {
}
}
}
func TestSocketDiagUDPnfo(t *testing.T) {
for _, want := range []uint8{syscall.AF_INET, syscall.AF_INET6} {
result, err := SocketDiagUDPInfo(want)
if err != nil {
t.Fatal(err)
}
for _, r := range result {
if got := r.InetDiagMsg.Family; got != want {
t.Fatalf("protocol family = %v, want %v", got, want)
}
}
}
}

8
tcp.go
View File

@ -82,3 +82,11 @@ type TCPBBRInfo struct {
BBRPacingGain uint32
BBRCwndGain uint32
}
// According to https://man7.org/linux/man-pages/man7/sock_diag.7.html
type MemInfo struct {
RMem uint32
WMem uint32
FMem uint32
TMem uint32
}

15
tcp_linux.go
View File

@ -8,6 +8,7 @@ import (
const (
tcpBBRInfoLen = 20
memInfoLen = 16
)
func checkDeserErr(err error) error {
@ -351,3 +352,17 @@ func (t *TCPBBRInfo) deserialize(b []byte) error {
return nil
}
func (m *MemInfo) deserialize(b []byte) error {
if len(b) != memInfoLen {
return errors.New("Invalid length")
}
rb := bytes.NewBuffer(b)
m.RMem = native.Uint32(rb.Next(4))
m.WMem = native.Uint32(rb.Next(4))
m.FMem = native.Uint32(rb.Next(4))
m.TMem = native.Uint32(rb.Next(4))
return nil
}