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// Copyright 2018 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 packet
import (
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
// saveData saves packet.data field.
func (p *packet) saveData() buffer.VectorisedView {
// We cannot save p.data directly as p.data.views may alias to p.views,
// which is not allowed by state framework (in-struct pointer).
return p.data.Clone(nil)
}
// loadData loads packet.data field.
func (p *packet) loadData(data buffer.VectorisedView) {
// NOTE: We cannot do the p.data = data.Clone(p.views[:]) optimization
// here because data.views is not guaranteed to be loaded by now. Plus,
// data.views will be allocated anyway so there really is little point
// of utilizing p.views for data.views.
p.data = data
}
// beforeSave is invoked by stateify.
func (ep *endpoint) beforeSave() {
// Stop incoming packets from being handled (and mutate endpoint state).
// The lock will be released after saveRcvBufSizeMax(), which would have
// saved ep.rcvBufSizeMax and set it to 0 to continue blocking incoming
// packets.
ep.rcvMu.Lock()
}
// saveRcvBufSizeMax is invoked by stateify.
func (ep *endpoint) saveRcvBufSizeMax() int {
max := ep.rcvBufSizeMax
// Make sure no new packets will be handled regardless of the lock.
ep.rcvBufSizeMax = 0
// Release the lock acquired in beforeSave() so regular endpoint closing
// logic can proceed after save.
ep.rcvMu.Unlock()
return max
}
// loadRcvBufSizeMax is invoked by stateify.
func (ep *endpoint) loadRcvBufSizeMax(max int) {
ep.rcvBufSizeMax = max
}
// afterLoad is invoked by stateify.
func (ep *endpoint) afterLoad() {
// StackFromEnv is a stack used specifically for save/restore.
ep.stack = stack.StackFromEnv
// TODO(gvisor.dev/173): Once bind is supported, choose the right NIC.
if err := ep.stack.RegisterPacketEndpoint(0, ep.netProto, ep); err != nil {
panic(*err)
}
}
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