gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/tcpip/header/ndp_neighbor_solicit.go (about)

     1  // Copyright 2019 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package header
    16  
    17  import "gvisor.dev/gvisor/pkg/tcpip"
    18  
    19  // NDPNeighborSolicit is an NDP Neighbor Solicitation message. It will only
    20  // contain the body of an ICMPv6 packet.
    21  //
    22  // See RFC 4861 section 4.3 for more details.
    23  type NDPNeighborSolicit []byte
    24  
    25  const (
    26  	// NDPNSMinimumSize is the minimum size of a valid NDP Neighbor
    27  	// Solicitation message (body of an ICMPv6 packet).
    28  	NDPNSMinimumSize = 20
    29  
    30  	// ndpNSTargetAddessOffset is the start of the Target Address
    31  	// field within an NDPNeighborSolicit.
    32  	ndpNSTargetAddessOffset = 4
    33  
    34  	// ndpNSOptionsOffset is the start of the NDP options in an
    35  	// NDPNeighborSolicit.
    36  	ndpNSOptionsOffset = ndpNSTargetAddessOffset + IPv6AddressSize
    37  )
    38  
    39  // TargetAddress returns the value within the Target Address field.
    40  func (b NDPNeighborSolicit) TargetAddress() tcpip.Address {
    41  	return tcpip.AddrFrom16Slice(b[ndpNSTargetAddessOffset:][:IPv6AddressSize])
    42  }
    43  
    44  // SetTargetAddress sets the value within the Target Address field.
    45  func (b NDPNeighborSolicit) SetTargetAddress(addr tcpip.Address) {
    46  	copy(b[ndpNSTargetAddessOffset:][:IPv6AddressSize], addr.AsSlice())
    47  }
    48  
    49  // Options returns an NDPOptions of the options body.
    50  func (b NDPNeighborSolicit) Options() NDPOptions {
    51  	return NDPOptions(b[ndpNSOptionsOffset:])
    52  }