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// Copyright 2022 The gVisor Authors.
//
// 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 packetsocket provides a link endpoint that enables delivery of
// incoming and outgoing packets to any interested packet sockets.
package packetsocket
import (
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/link/nested"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
var _ stack.NetworkDispatcher = (*endpoint)(nil)
var _ stack.LinkEndpoint = (*endpoint)(nil)
// +stateify savable
type endpoint struct {
nested.Endpoint
}
// New creates a new packetsocket link endpoint wrapping a lower link endpoint.
//
// On ingress, the lower link endpoint must only deliver packets that have
// a link-layer header set if one is required for the link.
func New(lower stack.LinkEndpoint) stack.LinkEndpoint {
e := &endpoint{}
e.Endpoint.Init(lower, e)
return e
}
// DeliverNetworkPacket implements stack.NetworkDispatcher.
func (e *endpoint) DeliverNetworkPacket(protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) {
e.Endpoint.DeliverLinkPacket(protocol, pkt)
e.Endpoint.DeliverNetworkPacket(protocol, pkt)
}
// WritePackets implements stack.LinkEndpoint.
func (e *endpoint) WritePackets(pkts stack.PacketBufferList) (int, tcpip.Error) {
for _, pkt := range pkts.AsSlice() {
e.Endpoint.DeliverLinkPacket(pkt.NetworkProtocolNumber, pkt)
}
return e.Endpoint.WritePackets(pkts)
}
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