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utils.go
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utils.go
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// Copyright 2020 Authors of Cilium
//
// 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 ctmap
import (
"github.com/cilium/cilium/pkg/bpf"
"github.com/cilium/cilium/pkg/maps/nat"
"github.com/cilium/cilium/pkg/tuple"
)
// NOTE: the function does NOT copy addr fields, so it's not safe to
// reuse the returned natKey.
func oNatKeyFromReverse(k nat.NatKey, v nat.NatEntry) nat.NatKey {
natKey, ok := k.(*nat.NatKey4)
if ok { // ipv4
natVal := v.(*nat.NatEntry4)
return &nat.NatKey4{TupleKey4Global: tuple.TupleKey4Global{
TupleKey4: tuple.TupleKey4{
SourceAddr: natVal.Addr,
SourcePort: natVal.Port,
DestAddr: natKey.SourceAddr,
DestPort: natKey.SourcePort,
NextHeader: natKey.NextHeader,
Flags: tuple.TUPLE_F_OUT,
}}}
}
{ // ipv6
natKey := k.(*nat.NatKey6)
natVal := v.(*nat.NatEntry6)
return &nat.NatKey6{TupleKey6Global: tuple.TupleKey6Global{
TupleKey6: tuple.TupleKey6{
SourceAddr: natVal.Addr,
SourcePort: natVal.Port,
DestAddr: natKey.SourceAddr,
DestPort: natKey.SourcePort,
NextHeader: natKey.NextHeader,
Flags: tuple.TUPLE_F_OUT,
}}}
}
}
// NOTE: the function does NOT copy addr fields, so it's not safe to
// reuse the returned ctKey.
func egressCTKeyFromIngressNatKeyAndVal(k nat.NatKey, v nat.NatEntry) bpf.MapKey {
natKey, ok := k.(*nat.NatKey4)
if ok { // ipv4
natVal := v.(*nat.NatEntry4)
return &tuple.TupleKey4Global{TupleKey4: tuple.TupleKey4{
// Workaround #5848
SourceAddr: natKey.SourceAddr,
DestPort: natKey.SourcePort,
DestAddr: natVal.Addr,
SourcePort: natVal.Port,
NextHeader: natKey.NextHeader,
Flags: tuple.TUPLE_F_OUT,
}}
}
{ // ipv6
natKey := k.(*nat.NatKey6)
natVal := v.(*nat.NatEntry6)
return &tuple.TupleKey6Global{TupleKey6: tuple.TupleKey6{
// Workaround #5848
SourceAddr: natKey.SourceAddr,
DestPort: natKey.SourcePort,
DestAddr: natVal.Addr,
SourcePort: natVal.Port,
NextHeader: natKey.NextHeader,
Flags: tuple.TUPLE_F_OUT,
}}
}
}