bugfix: parse ipv4 src/dst error

[Charlie17Li]

Introduction

When I use tc-pedit module to modify the src_ipv4/dst_ipv4, I check the result but the src_ipv4/dst_ipv4 is always "0".

For example, I want to set the dst_ipv4 to “172.17.0.2”, and I check the result with tc filter show dev eth0:

# actual
action order 1: pedit action ...
   key #1 at ipv4+16 val 00000000 mask 00000000

but the result is expeted to this:

# expect, the val is "172.17.0.2" not "0"
action order 1: pedit action ...
   key #1 at ipv4+16 val ac110002 mask 00000000

[Charlie17Li]

I just remove the unit test, because I found that parsing the pedit action is not supported now. so when I get filter and action from FilterList, the content of pedit action is empty.

netlink/filter_linux.go

Lines 800 to 820 in b1ce50c

	case nl.TCA_OPTIONS:
	adata, err := nl.ParseRouteAttr(aattr.Value)
	if err != nil {
	return nil, err
	}
	for _, adatum := range adata {
	switch actionType {
	case "mirred":
	switch adatum.Attr.Type {
	case nl.TCA_MIRRED_PARMS:
	mirred := *nl.DeserializeTcMirred(adatum.Value)
	action.(*MirredAction).ActionAttrs = ActionAttrs{}
	toAttrs(&mirred.TcGen, action.Attrs())
	action.(*MirredAction).Ifindex = int(mirred.Ifindex)
	action.(*MirredAction).MirredAction = MirredAct(mirred.Eaction)
	case nl.TCA_MIRRED_TM:
	tcTs := nl.DeserializeTcf(adatum.Value)
	actionTimestamp = toTimeStamp(tcTs)
	}
	case "tunnel_key":

[Charlie17Li]

cc @aboch @chent1996

[aboch]

Thank you @Charlie17Li .
Is it possible to add a new UT or extend an existing one to program and then read back this filter and make sure what is programmed in kernel is what we wanted to program?