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52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package header
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import "github.com/sagernet/sing-tun/internal/gtcpip"
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// NDPNeighborSolicit is an NDP Neighbor Solicitation message. It will only
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// contain the body of an ICMPv6 packet.
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//
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// See RFC 4861 section 4.3 for more details.
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type NDPNeighborSolicit []byte
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const (
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// NDPNSMinimumSize is the minimum size of a valid NDP Neighbor
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// Solicitation message (body of an ICMPv6 packet).
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NDPNSMinimumSize = 20
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// ndpNSTargetAddessOffset is the start of the Target Address
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// field within an NDPNeighborSolicit.
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ndpNSTargetAddessOffset = 4
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// ndpNSOptionsOffset is the start of the NDP options in an
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// NDPNeighborSolicit.
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ndpNSOptionsOffset = ndpNSTargetAddessOffset + IPv6AddressSize
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)
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// TargetAddress returns the value within the Target Address field.
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func (b NDPNeighborSolicit) TargetAddress() tcpip.Address {
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return tcpip.AddrFrom16Slice(b[ndpNSTargetAddessOffset:][:IPv6AddressSize])
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}
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// SetTargetAddress sets the value within the Target Address field.
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func (b NDPNeighborSolicit) SetTargetAddress(addr tcpip.Address) {
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copy(b[ndpNSTargetAddessOffset:][:IPv6AddressSize], addr.AsSlice())
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}
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// Options returns an NDPOptions of the options body.
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func (b NDPNeighborSolicit) Options() NDPOptions {
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return NDPOptions(b[ndpNSOptionsOffset:])
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}
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