1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
use pnet::packet::Packet;
use std::net::Ipv6Addr;

pub const ICMPV6_HEADER_LEN: usize =
    pnet::packet::icmpv6::echo_request::MutableEchoRequestPacket::minimum_packet_size();

/// ICMPv6 types
/// <https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml>
#[derive(Clone, Debug, PartialEq)]
pub enum Icmpv6Type {
    DestinationUnreachable,
    PacketTooBig,
    TimeExceeded,
    ParameterProblem,
    EchoRequest,
    EchoReply,
    MulticastListenerQuery,
    MulticastListenerReport,
    MulticastListenerDone,
    RouterSolicitation,
    RouterAdvertisement,
    NeighborSolicitation,
    NeighborAdvertisement,
    RedirectMessage,
    RouterRenumbering,
    NodeInformationQuery,
    NodeInformationResponse,
    InverseNeighborDiscoverySolicitation,
    InverseNeighborDiscoveryAdvertisement,
    Version2MulticastListenerReport,
    HomeAgentAddressDiscoveryRequest,
    HomeAgentAddressDiscoveryReply,
    MobilePrefixSolicitation,
    MobilePrefixAdvertisement,
    CertificationPathSolicitationMessage,
    CertificationPathAdvertisementMessage,
    ExperimentalMobilityProtocols,
    MulticastRouterAdvertisement,
    MulticastRouterSolicitation,
    MulticastRouterTermination,
    FMIPv6Messages,
    RPLControlMessage,
    ILNPv6LocatorUpdateMessage,
    DuplicateAddressRequest,
    DuplicateAddressConfirmation,
    MPLControlMessage,
    ExtendedEchoRequest,
    ExtendedEchoReply,
    Unknown(u8),
}

impl Icmpv6Type {
    /// Get the number of the ICMPv6 type
    pub fn number(&self) -> u8 {
        match *self {
            Icmpv6Type::DestinationUnreachable => 1,
            Icmpv6Type::PacketTooBig => 2,
            Icmpv6Type::TimeExceeded => 3,
            Icmpv6Type::ParameterProblem => 4,
            Icmpv6Type::EchoRequest => 128,
            Icmpv6Type::EchoReply => 129,
            Icmpv6Type::MulticastListenerQuery => 130,
            Icmpv6Type::MulticastListenerReport => 131,
            Icmpv6Type::MulticastListenerDone => 132,
            Icmpv6Type::RouterSolicitation => 133,
            Icmpv6Type::RouterAdvertisement => 134,
            Icmpv6Type::NeighborSolicitation => 135,
            Icmpv6Type::NeighborAdvertisement => 136,
            Icmpv6Type::RedirectMessage => 137,
            Icmpv6Type::RouterRenumbering => 138,
            Icmpv6Type::NodeInformationQuery => 139,
            Icmpv6Type::NodeInformationResponse => 140,
            Icmpv6Type::InverseNeighborDiscoverySolicitation => 141,
            Icmpv6Type::InverseNeighborDiscoveryAdvertisement => 142,
            Icmpv6Type::Version2MulticastListenerReport => 143,
            Icmpv6Type::HomeAgentAddressDiscoveryRequest => 144,
            Icmpv6Type::HomeAgentAddressDiscoveryReply => 145,
            Icmpv6Type::MobilePrefixSolicitation => 146,
            Icmpv6Type::MobilePrefixAdvertisement => 147,
            Icmpv6Type::CertificationPathSolicitationMessage => 148,
            Icmpv6Type::CertificationPathAdvertisementMessage => 149,
            Icmpv6Type::ExperimentalMobilityProtocols => 150,
            Icmpv6Type::MulticastRouterAdvertisement => 151,
            Icmpv6Type::MulticastRouterSolicitation => 152,
            Icmpv6Type::MulticastRouterTermination => 153,
            Icmpv6Type::FMIPv6Messages => 154,
            Icmpv6Type::RPLControlMessage => 155,
            Icmpv6Type::ILNPv6LocatorUpdateMessage => 156,
            Icmpv6Type::DuplicateAddressRequest => 157,
            Icmpv6Type::DuplicateAddressConfirmation => 158,
            Icmpv6Type::MPLControlMessage => 159,
            Icmpv6Type::ExtendedEchoRequest => 160,
            Icmpv6Type::ExtendedEchoReply => 161,
            Icmpv6Type::Unknown(n) => n,
        }
    }
    /// Get the id of the ICMPv6 type
    pub fn id(&self) -> String {
        match *self {
            Icmpv6Type::DestinationUnreachable => String::from("destination_unreachable"),
            Icmpv6Type::PacketTooBig => String::from("packet_too_big"),
            Icmpv6Type::TimeExceeded => String::from("time_exceeded"),
            Icmpv6Type::ParameterProblem => String::from("parameter_problem"),
            Icmpv6Type::EchoRequest => String::from("echo_request"),
            Icmpv6Type::EchoReply => String::from("echo_reply"),
            Icmpv6Type::MulticastListenerQuery => String::from("multicast_listener_query"),
            Icmpv6Type::MulticastListenerReport => String::from("multicast_listener_report"),
            Icmpv6Type::MulticastListenerDone => String::from("multicast_listener_done"),
            Icmpv6Type::RouterSolicitation => String::from("router_solicitation"),
            Icmpv6Type::RouterAdvertisement => String::from("router_advertisement"),
            Icmpv6Type::NeighborSolicitation => String::from("neighbor_solicitation"),
            Icmpv6Type::NeighborAdvertisement => String::from("neighbor_advertisement"),
            Icmpv6Type::RedirectMessage => String::from("redirect_message"),
            Icmpv6Type::RouterRenumbering => String::from("router_renumbering"),
            Icmpv6Type::NodeInformationQuery => String::from("node_information_query"),
            Icmpv6Type::NodeInformationResponse => String::from("node_information_response"),
            Icmpv6Type::InverseNeighborDiscoverySolicitation => {
                String::from("inverse_neighbor_discovery_solicitation")
            }
            Icmpv6Type::InverseNeighborDiscoveryAdvertisement => {
                String::from("inverse_neighbor_discovery_advertisement")
            }
            Icmpv6Type::Version2MulticastListenerReport => {
                String::from("version_2_multicast_listener_report")
            }
            Icmpv6Type::HomeAgentAddressDiscoveryRequest => {
                String::from("home_agent_address_discovery_request")
            }
            Icmpv6Type::HomeAgentAddressDiscoveryReply => {
                String::from("home_agent_address_discovery_reply")
            }
            Icmpv6Type::MobilePrefixSolicitation => String::from("mobile_prefix_solicitation"),
            Icmpv6Type::MobilePrefixAdvertisement => String::from("mobile_prefix_advertisement"),
            Icmpv6Type::CertificationPathSolicitationMessage => {
                String::from("certification_path_solicitation_message")
            }
            Icmpv6Type::CertificationPathAdvertisementMessage => {
                String::from("certification_path_advertisement_message")
            }
            Icmpv6Type::ExperimentalMobilityProtocols => {
                String::from("experimental_mobility_protocols")
            }
            Icmpv6Type::MulticastRouterAdvertisement => {
                String::from("multicast_router_advertisement")
            }
            Icmpv6Type::MulticastRouterSolicitation => {
                String::from("multicast_router_solicitation")
            }
            Icmpv6Type::MulticastRouterTermination => String::from("multicast_router_termination"),
            Icmpv6Type::FMIPv6Messages => String::from("fmipv6_messages"),
            Icmpv6Type::RPLControlMessage => String::from("rpl_control_message"),
            Icmpv6Type::ILNPv6LocatorUpdateMessage => String::from("ilnpv6_locator_update_message"),
            Icmpv6Type::DuplicateAddressRequest => String::from("duplicate_address_request"),
            Icmpv6Type::DuplicateAddressConfirmation => {
                String::from("duplicate_address_confirmation")
            }
            Icmpv6Type::MPLControlMessage => String::from("mpl_control_message"),
            Icmpv6Type::ExtendedEchoRequest => String::from("extended_echo_request"),
            Icmpv6Type::ExtendedEchoReply => String::from("extended_echo_reply"),
            Icmpv6Type::Unknown(n) => format!("unknown_{}", n),
        }
    }
    /// Get the name of the ICMPv6 type
    pub fn name(&self) -> String {
        match *self {
            Icmpv6Type::DestinationUnreachable => String::from("Destination Unreachable"),
            Icmpv6Type::PacketTooBig => String::from("Packet Too Big"),
            Icmpv6Type::TimeExceeded => String::from("Time Exceeded"),
            Icmpv6Type::ParameterProblem => String::from("Parameter Problem"),
            Icmpv6Type::EchoRequest => String::from("Echo Request"),
            Icmpv6Type::EchoReply => String::from("Echo Reply"),
            Icmpv6Type::MulticastListenerQuery => String::from("Multicast Listener Query"),
            Icmpv6Type::MulticastListenerReport => String::from("Multicast Listener Report"),
            Icmpv6Type::MulticastListenerDone => String::from("Multicast Listener Done"),
            Icmpv6Type::RouterSolicitation => String::from("Router Solicitation"),
            Icmpv6Type::RouterAdvertisement => String::from("Router Advertisement"),
            Icmpv6Type::NeighborSolicitation => String::from("Neighbor Solicitation"),
            Icmpv6Type::NeighborAdvertisement => String::from("Neighbor Advertisement"),
            Icmpv6Type::RedirectMessage => String::from("Redirect Message"),
            Icmpv6Type::RouterRenumbering => String::from("Router Renumbering"),
            Icmpv6Type::NodeInformationQuery => String::from("Node Information Query"),
            Icmpv6Type::NodeInformationResponse => String::from("Node Information Response"),
            Icmpv6Type::InverseNeighborDiscoverySolicitation => {
                String::from("Inverse Neighbor Discovery Solicitation")
            }
            Icmpv6Type::InverseNeighborDiscoveryAdvertisement => {
                String::from("Inverse Neighbor Discovery Advertisement")
            }
            Icmpv6Type::Version2MulticastListenerReport => {
                String::from("Version 2 Multicast Listener Report")
            }
            Icmpv6Type::HomeAgentAddressDiscoveryRequest => {
                String::from("Home Agent Address Discovery Request")
            }
            Icmpv6Type::HomeAgentAddressDiscoveryReply => {
                String::from("Home Agent Address Discovery Reply")
            }
            Icmpv6Type::MobilePrefixSolicitation => String::from("Mobile Prefix Solicitation"),
            Icmpv6Type::MobilePrefixAdvertisement => String::from("Mobile Prefix Advertisement"),
            Icmpv6Type::CertificationPathSolicitationMessage => {
                String::from("Certification Path Solicitation Message")
            }
            Icmpv6Type::CertificationPathAdvertisementMessage => {
                String::from("Certification Path Advertisement Message")
            }
            Icmpv6Type::ExperimentalMobilityProtocols => {
                String::from("Experimental Mobility Protocols")
            }
            Icmpv6Type::MulticastRouterAdvertisement => {
                String::from("Multicast Router Advertisement")
            }
            Icmpv6Type::MulticastRouterSolicitation => {
                String::from("Multicast Router Solicitation")
            }
            Icmpv6Type::MulticastRouterTermination => String::from("Multicast Router Termination"),
            Icmpv6Type::FMIPv6Messages => String::from("FMIPv6 Messages"),
            Icmpv6Type::RPLControlMessage => String::from("RPL Control Message"),
            Icmpv6Type::ILNPv6LocatorUpdateMessage => String::from("ILNPv6 Locator Update Message"),
            Icmpv6Type::DuplicateAddressRequest => String::from("Duplicate Address Request"),
            Icmpv6Type::DuplicateAddressConfirmation => {
                String::from("Duplicate Address Confirmation")
            }
            Icmpv6Type::MPLControlMessage => String::from("MPL Control Message"),
            Icmpv6Type::ExtendedEchoRequest => String::from("Extended Echo Request"),
            Icmpv6Type::ExtendedEchoReply => String::from("Extended Echo Reply"),
            Icmpv6Type::Unknown(n) => format!("Unknown ({})", n),
        }
    }
    pub(crate) fn from_pnet_type(t: pnet::packet::icmpv6::Icmpv6Type) -> Icmpv6Type {
        match t {
            pnet::packet::icmpv6::Icmpv6Types::DestinationUnreachable => {
                Icmpv6Type::DestinationUnreachable
            }
            pnet::packet::icmpv6::Icmpv6Types::PacketTooBig => Icmpv6Type::PacketTooBig,
            pnet::packet::icmpv6::Icmpv6Types::TimeExceeded => Icmpv6Type::TimeExceeded,
            pnet::packet::icmpv6::Icmpv6Types::ParameterProblem => Icmpv6Type::ParameterProblem,
            pnet::packet::icmpv6::Icmpv6Types::EchoRequest => Icmpv6Type::EchoRequest,
            pnet::packet::icmpv6::Icmpv6Types::EchoReply => Icmpv6Type::EchoReply,
            _ => Icmpv6Type::Unknown(t.0),
        }
    }
}

/// Represents the ICMPv6 code header field.
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Icmpv6Code {
    DestinationUnreachable,
    PacketTooBig,
    TimeExceeded,
    ParameterProblem,
    EchoRequest,
    EchoReply,
    MulticastListenerQuery,
    MulticastListenerReport,
    MulticastListenerDone,
    RouterSolicitation,
    RouterAdvertisement,
    NeighborSolicitation,
    NeighborAdvertisement,
    RedirectMessage,
    RouterRenumbering,
    NodeInformationQuery,
    NodeInformationResponse,
    InverseNeighborDiscoverySolicitation,
    InverseNeighborDiscoveryAdvertisement,
    Version2MulticastListenerReport,
    HomeAgentAddressDiscoveryRequest,
    HomeAgentAddressDiscoveryReply,
    MobilePrefixSolicitation,
    MobilePrefixAdvertisement,
    CertificationPathSolicitationMessage,
    CertificationPathAdvertisementMessage,
    ExperimentalMobilityProtocols,
    MulticastRouterAdvertisement,
    MulticastRouterSolicitation,
    MulticastRouterTermination,
    FMIPv6Messages,
    RPLControlMessage,
    ILNPv6LocatorUpdateMessage,
    DuplicateAddressRequest,
    DuplicateAddressConfirmation,
    MPLControlMessage,
    ExtendedEchoRequest,
    ExtendedEchoReply,
    Unknown(u8),
}

impl Icmpv6Code {
    /// Constructs a new Icmpv6Code from u8
    pub fn from_u8(t: u8) -> Icmpv6Code {
        match t {
            1 => Icmpv6Code::DestinationUnreachable,
            2 => Icmpv6Code::PacketTooBig,
            3 => Icmpv6Code::TimeExceeded,
            4 => Icmpv6Code::ParameterProblem,
            128 => Icmpv6Code::EchoRequest,
            129 => Icmpv6Code::EchoReply,
            130 => Icmpv6Code::MulticastListenerQuery,
            131 => Icmpv6Code::MulticastListenerReport,
            132 => Icmpv6Code::MulticastListenerDone,
            133 => Icmpv6Code::RouterSolicitation,
            134 => Icmpv6Code::RouterAdvertisement,
            135 => Icmpv6Code::NeighborSolicitation,
            136 => Icmpv6Code::NeighborAdvertisement,
            137 => Icmpv6Code::RedirectMessage,
            138 => Icmpv6Code::RouterRenumbering,
            139 => Icmpv6Code::NodeInformationQuery,
            140 => Icmpv6Code::NodeInformationResponse,
            141 => Icmpv6Code::InverseNeighborDiscoverySolicitation,
            142 => Icmpv6Code::InverseNeighborDiscoveryAdvertisement,
            143 => Icmpv6Code::Version2MulticastListenerReport,
            144 => Icmpv6Code::HomeAgentAddressDiscoveryRequest,
            145 => Icmpv6Code::HomeAgentAddressDiscoveryReply,
            146 => Icmpv6Code::MobilePrefixSolicitation,
            147 => Icmpv6Code::MobilePrefixAdvertisement,
            148 => Icmpv6Code::CertificationPathSolicitationMessage,
            149 => Icmpv6Code::CertificationPathAdvertisementMessage,
            150 => Icmpv6Code::ExperimentalMobilityProtocols,
            151 => Icmpv6Code::MulticastRouterAdvertisement,
            152 => Icmpv6Code::MulticastRouterSolicitation,
            153 => Icmpv6Code::MulticastRouterTermination,
            154 => Icmpv6Code::FMIPv6Messages,
            155 => Icmpv6Code::RPLControlMessage,
            156 => Icmpv6Code::ILNPv6LocatorUpdateMessage,
            157 => Icmpv6Code::DuplicateAddressRequest,
            158 => Icmpv6Code::DuplicateAddressConfirmation,
            159 => Icmpv6Code::MPLControlMessage,
            160 => Icmpv6Code::ExtendedEchoRequest,
            161 => Icmpv6Code::ExtendedEchoReply,
            _ => Icmpv6Code::Unknown(t),
        }
    }
    /// Get the number of the ICMPv6 code
    pub fn number(&self) -> u8 {
        match *self {
            Icmpv6Code::DestinationUnreachable => 1,
            Icmpv6Code::PacketTooBig => 2,
            Icmpv6Code::TimeExceeded => 3,
            Icmpv6Code::ParameterProblem => 4,
            Icmpv6Code::EchoRequest => 128,
            Icmpv6Code::EchoReply => 129,
            Icmpv6Code::MulticastListenerQuery => 130,
            Icmpv6Code::MulticastListenerReport => 131,
            Icmpv6Code::MulticastListenerDone => 132,
            Icmpv6Code::RouterSolicitation => 133,
            Icmpv6Code::RouterAdvertisement => 134,
            Icmpv6Code::NeighborSolicitation => 135,
            Icmpv6Code::NeighborAdvertisement => 136,
            Icmpv6Code::RedirectMessage => 137,
            Icmpv6Code::RouterRenumbering => 138,
            Icmpv6Code::NodeInformationQuery => 139,
            Icmpv6Code::NodeInformationResponse => 140,
            Icmpv6Code::InverseNeighborDiscoverySolicitation => 141,
            Icmpv6Code::InverseNeighborDiscoveryAdvertisement => 142,
            Icmpv6Code::Version2MulticastListenerReport => 143,
            Icmpv6Code::HomeAgentAddressDiscoveryRequest => 144,
            Icmpv6Code::HomeAgentAddressDiscoveryReply => 145,
            Icmpv6Code::MobilePrefixSolicitation => 146,
            Icmpv6Code::MobilePrefixAdvertisement => 147,
            Icmpv6Code::CertificationPathSolicitationMessage => 148,
            Icmpv6Code::CertificationPathAdvertisementMessage => 149,
            Icmpv6Code::ExperimentalMobilityProtocols => 150,
            Icmpv6Code::MulticastRouterAdvertisement => 151,
            Icmpv6Code::MulticastRouterSolicitation => 152,
            Icmpv6Code::MulticastRouterTermination => 153,
            Icmpv6Code::FMIPv6Messages => 154,
            Icmpv6Code::RPLControlMessage => 155,
            Icmpv6Code::ILNPv6LocatorUpdateMessage => 156,
            Icmpv6Code::DuplicateAddressRequest => 157,
            Icmpv6Code::DuplicateAddressConfirmation => 158,
            Icmpv6Code::MPLControlMessage => 159,
            Icmpv6Code::ExtendedEchoRequest => 160,
            Icmpv6Code::ExtendedEchoReply => 161,
            Icmpv6Code::Unknown(n) => n,
        }
    }
}

/// Represents an ICMPv6 packet.
#[derive(Clone, Debug, PartialEq)]
pub struct Icmpv6Packet {
    /// ICMPv6 type
    pub icmpv6_type: Icmpv6Type,
    /// ICMPv6 code
    pub icmpv6_code: Icmpv6Code,
    /// ICMPv6 checksum
    pub checksum: u16,
    /// Payload
    pub payload: Vec<u8>,
}

impl Icmpv6Packet {
    pub(crate) fn from_pnet_packet(packet: &pnet::packet::icmpv6::Icmpv6Packet) -> Icmpv6Packet {
        Icmpv6Packet {
            icmpv6_type: Icmpv6Type::from_pnet_type(packet.get_icmpv6_type()),
            icmpv6_code: Icmpv6Code::from_u8(packet.get_icmpv6_code().0),
            checksum: packet.get_checksum(),
            payload: packet.payload().to_vec(),
        }
    }
    /// Constructs a new Icmpv6Packet from bytes
    pub fn from_bytes(packet: &[u8]) -> Icmpv6Packet {
        let icmpv6_packet = pnet::packet::icmpv6::Icmpv6Packet::new(packet).unwrap();
        Icmpv6Packet::from_pnet_packet(&icmpv6_packet)
    }
}

/// Build ICMPv6 packet
pub(crate) fn build_icmpv6_echo_packet(
    icmp_packet: &mut pnet::packet::icmpv6::echo_request::MutableEchoRequestPacket,
    src_ip: Ipv6Addr,
    dst_ip: Ipv6Addr,
) {
    icmp_packet.set_icmpv6_type(pnet::packet::icmpv6::Icmpv6Types::EchoRequest);
    icmp_packet.set_identifier(rand::random::<u16>());
    icmp_packet.set_sequence_number(rand::random::<u16>());
    let icmpv6_packet = pnet::packet::icmpv6::Icmpv6Packet::new(icmp_packet.packet()).unwrap();
    let icmpv6_checksum = pnet::packet::icmpv6::checksum(&icmpv6_packet, &src_ip, &dst_ip);
    //let icmp_check_sum = pnet::packet::util::checksum(&icmp_packet.packet(), 1);
    icmp_packet.set_checksum(icmpv6_checksum);
}

/// ICMPv6 Packet Builder
#[derive(Clone, Debug)]
pub struct Icmpv6PacketBuilder {
    /// Source IPv6 address
    pub src_ip: Ipv6Addr,
    /// Destination IPv6 address
    pub dst_ip: Ipv6Addr,
    /// ICMPv6 type
    pub icmpv6_type: Icmpv6Type,
    /// ICMPv6 sequence number
    pub sequence_number: Option<u16>,
    /// ICMPv6 identifier
    pub identifier: Option<u16>,
}

impl Icmpv6PacketBuilder {
    /// Constructs a new Icmpv6PacketBuilder
    pub fn new(src_ip: Ipv6Addr, dst_ip: Ipv6Addr) -> Icmpv6PacketBuilder {
        Icmpv6PacketBuilder {
            src_ip,
            dst_ip,
            icmpv6_type: Icmpv6Type::EchoRequest,
            sequence_number: None,
            identifier: None,
        }
    }
    /// Build ICMPv6 packet and return bytes
    pub fn build(&self) -> Vec<u8> {
        let buffer: &mut [u8] = &mut [0u8; ICMPV6_HEADER_LEN];
        let mut icmp_packet =
            pnet::packet::icmpv6::echo_request::MutableEchoRequestPacket::new(buffer).unwrap();
        icmp_packet.set_icmpv6_type(pnet::packet::icmpv6::Icmpv6Type(self.icmpv6_type.number()));
        icmp_packet.set_identifier(self.identifier.unwrap_or(rand::random::<u16>()));
        icmp_packet.set_sequence_number(self.sequence_number.unwrap_or(rand::random::<u16>()));
        let icmpv6_packet = pnet::packet::icmpv6::Icmpv6Packet::new(icmp_packet.packet()).unwrap();
        let icmpv6_checksum =
            pnet::packet::icmpv6::checksum(&icmpv6_packet, &self.src_ip, &self.dst_ip);
        icmp_packet.set_checksum(icmpv6_checksum);
        icmp_packet.packet().to_vec()
    }
}