Add --output-skb-cb

To be able to print skb->cb w/o requiring --filter-trace-tc.

Signed-off-by: Martynas Pumputis <[email protected]>

Author: brb

internal/pwru/config.go

@@ -70,7 +70,7 @@ func GetConfig(flags *Flags) (cfg FilterCfg, err error) {
 	if flags.OutputCaller {
 		cfg.OutputFlags |= OutputCallerMask
 	}
-	if flags.FilterTraceTc {
+	if flags.FilterTraceTc || flags.OutputSkbCB {
 		cfg.OutputFlags |= OutputCbMask
 	}
 	if flags.FilterTrackSkb {

internal/pwru/output.go

@@ -142,7 +142,7 @@ func (o *output) PrintHeader() {
 	}
 	if o.flags.OutputMeta {
 		fmt.Fprintf(o.writer, " %-10s %-8s %16s %-6s %-5s %-5s", "NETNS", "MARK/x", centerAlignString("IFACE", 16), "PROTO", "MTU", "LEN")
-		if o.flags.FilterTraceTc {
+		if o.flags.FilterTraceTc || o.flags.OutputSkbCB {
 			fmt.Fprintf(o.writer, " %-56s", "__sk_buff->cb[]")
 		}
 	}
@@ -191,7 +191,7 @@ func (o *output) PrintJson(event *Event) {
 		d.Proto = byteorder.NetworkToHost16(event.Meta.Proto)
 		d.Mtu = event.Meta.MTU
 		d.Len = event.Meta.Len
-		if o.flags.FilterTraceTc {
+		if o.flags.FilterTraceTc || o.flags.OutputSkbCB {
 			d.Cb = event.Meta.Cb
 		}
 	}
@@ -425,7 +425,7 @@ func (o *output) Print(event *Event) {
 
 	if o.flags.OutputMeta {
 		fmt.Fprintf(o.writer, " %s", getMetaData(event, o))
-		if o.flags.FilterTraceTc {
+		if o.flags.FilterTraceTc || o.flags.OutputSkbCB {
 			fmt.Fprintf(o.writer, " %s", getCb(event))
 		}
 	}

internal/pwru/types.go

@@ -46,6 +46,7 @@ type Flags struct {
 	OutputStack      bool
 	OutputCaller     bool
 	OutputLimitLines uint64
+	OutputSkbCB      bool
 	OutputFile       string
 	OutputJson       bool
 
@@ -82,6 +83,7 @@ func (f *Flags) SetFlags() {
 	flag.BoolVar(&f.OutputStack, "output-stack", false, "print stack")
 	flag.BoolVar(&f.OutputCaller, "output-caller", false, "print caller function name")
 	flag.Uint64Var(&f.OutputLimitLines, "output-limit-lines", 0, "exit the program after the number of events has been received/printed")
+	flag.BoolVar(&f.OutputSkbCB, "output-skb-cb", false, "print skb->cb")
 
 	flag.StringVar(&f.OutputFile, "output-file", "", "write traces to file")