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package nftables
import (
"fmt"
"github.com/google/nftables/expr"
"golang.org/x/sys/unix"
)
const nft_RULE_COMPAT_F_INV uint32 = (1 << 1)
const nft_RULE_COMPAT_F_MASK uint32 = nft_RULE_COMPAT_F_INV
// Used by xt match or target like xt_tcpudp to set compat policy between xtables and nftables
// https://elixir.bootlin.com/linux/v5.12/source/net/netfilter/nft_compat.c#L187
type compatPolicy struct {
Proto uint32
Flag uint32
}
var xtMatchCompatMap map[string]*compatPolicy = map[string]*compatPolicy{
"tcp": {
Proto: unix.IPPROTO_TCP,
},
"udp": {
Proto: unix.IPPROTO_UDP,
},
"udplite": {
Proto: unix.IPPROTO_UDPLITE,
},
"tcpmss": {
Proto: unix.IPPROTO_TCP,
},
"sctp": {
Proto: unix.IPPROTO_SCTP,
},
"osf": {
Proto: unix.IPPROTO_TCP,
},
"ipcomp": {
Proto: unix.IPPROTO_COMP,
},
"esp": {
Proto: unix.IPPROTO_ESP,
},
}
var xtTargetCompatMap map[string]*compatPolicy = map[string]*compatPolicy{
"TCPOPTSTRIP": {
Proto: unix.IPPROTO_TCP,
},
"TCPMSS": {
Proto: unix.IPPROTO_TCP,
},
}
func getCompatPolicy(exprs []expr.Any) (*compatPolicy, error) {
var exprItem expr.Any
var compat *compatPolicy
for _, iter := range exprs {
var tmpExprItem expr.Any
var tmpCompat *compatPolicy
switch item := iter.(type) {
case *expr.Match:
if compat, ok := xtMatchCompatMap[item.Name]; ok {
tmpCompat = compat
tmpExprItem = item
} else {
continue
}
case *expr.Target:
if compat, ok := xtTargetCompatMap[item.Name]; ok {
tmpCompat = compat
tmpExprItem = item
} else {
continue
}
default:
continue
}
if compat == nil {
compat = tmpCompat
exprItem = tmpExprItem
} else if *compat != *tmpCompat {
return nil, fmt.Errorf("%#v and %#v has conflict compat policy %#v vs %#v", exprItem, tmpExprItem, compat, tmpCompat)
}
}
return compat, nil
}
|
