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|
use crate::protocol::codec::Decode;
use crate::protocol::ip::IPProtocol;
use nom::bits;
use nom::bytes;
use nom::error::Error;
use nom::number;
use nom::sequence;
use nom::IResult;
use std::convert::TryFrom;
use std::net::Ipv6Addr;
/******************************************************************************
* Struct
******************************************************************************/
/*
* IPv6 Header Format
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Version| Traffic Class | Flow Label |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Payload Length | Next Header | Hop Limit |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | |
* + Source Address +
* | |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | |
* + Destination Address +
* | |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/*
* IPv6 AH Format
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Next Header | Payload Len | RESERVED |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Security Parameters Index (SPI) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Sequence Number Field |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + Integrity Check Value-ICV (variable) |
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Ipv6Extension {
pub next_header: IPProtocol,
pub ext_length: u8, // Extension total Length
pub data: Vec<u8>, // Extension data length (ext_length - 2)
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Ipv6Header {
pub version: u8, // 4 bit
pub dsc: u8, // Differentiated Services Codepoint: 6 bit
pub ecn: u8, // Explicit Congestion Notification: 2 bit
pub flow_label: u32, // 20 bit
pub length: u16,
pub next_header: IPProtocol,
pub hop_limit: u8,
pub source_address: Ipv6Addr,
pub dest_address: Ipv6Addr,
pub extensions: Vec<Ipv6Extension>,
}
/******************************************************************************
* API
******************************************************************************/
fn half_byte_decode(input: &[u8]) -> IResult<&[u8], (u8, u8)> {
bits::bits::<_, _, Error<_>, _, _>(sequence::pair(
bits::streaming::take(4u8),
bits::streaming::take(4u8),
))(input)
}
fn address_v6_decode(input: &[u8]) -> IResult<&[u8], Ipv6Addr> {
let (input, ipv6) = bytes::streaming::take(16u8)(input)?;
Ok((input, Ipv6Addr::from(<[u8; 16]>::try_from(ipv6).unwrap())))
}
fn extension_decode(input: &[u8], curr_proto: IPProtocol) -> IResult<&[u8], Ipv6Extension> {
let (input, next_header) = IPProtocol::decode(input)?;
let (input, mut ext_length) = number::streaming::be_u8(input)?;
/*
* https://datatracker.ietf.org/doc/html/rfc4302#page-4
*
* (Note that although IPv6 [DH98] characterizes AH as
* an extension header, its length is measured in 32-bit words, not the
* 64-bit words used by other IPv6 extension headers.)
*/
if curr_proto == IPProtocol::AUTH {
ext_length = ext_length * 4 + 8 // update Authentication Header length
} else {
ext_length = ext_length * 8 + 8; // update other extension header length
}
let (input, data) = bytes::streaming::take(ext_length - 2)(input)?;
Ok((
input,
Ipv6Extension {
next_header,
ext_length,
data: data.to_vec(),
},
))
}
impl Decode for Ipv6Header {
type Iterm = Ipv6Header;
fn decode(input: &[u8]) -> IResult<&[u8], Ipv6Header> {
let (input, ver_tc) = half_byte_decode(input)?;
let (input, tc_fl) = half_byte_decode(input)?;
let (input, fl): (_, u32) =
bits::bits::<_, _, Error<_>, _, _>(bits::streaming::take(16u8))(input)?;
let (input, length) = number::streaming::be_u16(input)?;
let (input, next_header) = IPProtocol::decode(input)?;
let (input, hop_limit) = number::streaming::be_u8(input)?;
let (input, source_address) = address_v6_decode(input)?;
let (input, dest_address) = address_v6_decode(input)?;
let mut remain = input;
let mut next_proto = next_header;
let mut extensions = Vec::new();
while IPProtocol::is_ipv6_ext_header(next_proto) {
let (left, extension) = extension_decode(remain, next_proto)?;
remain = left;
next_proto = extension.next_header;
extensions.push(extension);
}
Ok((
remain,
Ipv6Header {
version: ver_tc.0,
dsc: (ver_tc.1 << 2) + ((tc_fl.0 & 0b1100) >> 2),
ecn: tc_fl.0 & 0b11,
flow_label: (u32::from(tc_fl.1) << 16) + fl,
length,
next_header,
hop_limit,
source_address,
dest_address,
extensions,
},
))
}
}
/******************************************************************************
* TEST
******************************************************************************/
#[cfg(test)]
mod tests {
use super::Ipv6Extension;
use super::Ipv6Header;
use crate::protocol::codec::Decode;
use crate::protocol::ip::IPProtocol;
use std::net::Ipv6Addr;
const LAST_SLICE: &'static [u8] = &[0xff];
#[test]
fn ipv6_header_decode() {
/*
* Internet Protocol Version 6, Src: 2409:8034:4025::50:a31, Dst: 2409:8034:4040:5301::204
* 0110 .... = Version: 6
* .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
* .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
* .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
* Payload Length: 1416
* Next Header: UDP (17)
* Hop Limit: 252
* Source Address: 2409:8034:4025::50:a31
* Destination Address: 2409:8034:4040:5301::204
*/
let bytes = [
0x60, /* Version and Partial Differentiated Services Codepoint */
0x00, /* Partial Differentiated Services Codepoint and Explicit Congestion Notification and Partial Flow Label */
0x00, 0x00, /* Partial Flow Label */
0x05, 0x88, /* Payload Length */
0x11, /* Next Header */
0xfc, /* Hop Limit */
0x24, 0x09, 0x80, 0x34, 0x40, 0x25, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50,
0x0a, 0x31, /* Source Address */
0x24, 0x09, 0x80, 0x34, 0x40, 0x40, 0x53, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x02, 0x04, /* Destination Address */
0xff, /* Payload */
];
let expectation = Ipv6Header {
version: 6,
dsc: 0,
ecn: 0,
flow_label: 0,
length: 1416,
next_header: IPProtocol::UDP,
hop_limit: 252,
source_address: Ipv6Addr::new(
0x2409, 0x8034, 0x4025, 0x0000, 0x0000, 0x0000, 0x0050, 0x0a31,
),
dest_address: Ipv6Addr::new(
0x2409, 0x8034, 0x4040, 0x5301, 0x0000, 0x0000, 0x0000, 0x0204,
),
extensions: Vec::new(),
};
assert_eq!(Ipv6Header::decode(&bytes), Ok((LAST_SLICE, expectation)));
// example
let result = Ipv6Header::decode(&bytes);
if let Ok((payload, header)) = result {
println!("return: {:?}, payload: {}", header, payload.len());
} else {
println!("return: Incomplete data");
}
}
#[test]
fn ipv6_hop_extension_decode() {
/*
* Internet Protocol Version 6, Src: ::, Dst: ff02::16
* 0110 .... = Version: 6
* .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
* .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
* .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
* Payload Length: 36
* Next Header: IPv6 Hop-by-Hop Option (0)
* Hop Limit: 1
* Source Address: ::
* Destination Address: ff02::16
* IPv6 Hop-by-Hop Option
* Next Header: ICMPv6 (58)
* Length: 0
* [Length: 8 bytes]
* Router Alert
* Type: Router Alert (0x05)
* 00.. .... = Action: Skip and continue (0)
* ..0. .... = May Change: No
* ...0 0101 = Low-Order Bits: 0x05
* Length: 2
* Router Alert: MLD (0)
* PadN
* Type: PadN (0x01)
* 00.. .... = Action: Skip and continue (0)
* ..0. .... = May Change: No
* ...0 0001 = Low-Order Bits: 0x01
* Length: 0
* PadN: <none>
*/
let bytes = [
0x60, 0x00, 0x00, 0x00, 0x00, 0x24, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x3a, 0x00,
0x05, 0x02, 0x00, 0x00, 0x01, 0x00, /* Extensions Data */
0xff, /* Payload */
];
let expectation = Ipv6Header {
version: 6,
dsc: 0,
ecn: 0,
flow_label: 0,
length: 36,
next_header: IPProtocol::IPV6HOP,
hop_limit: 1,
source_address: Ipv6Addr::new(
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
),
dest_address: Ipv6Addr::new(
0xff02, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0016,
),
extensions: vec![Ipv6Extension {
next_header: IPProtocol::ICMP6,
ext_length: 8,
data: vec![0x05, 0x02, 0x00, 0x00, 0x01, 0x00],
}],
};
assert_eq!(Ipv6Header::decode(&bytes), Ok((LAST_SLICE, expectation)));
// example
let result = Ipv6Header::decode(&bytes);
if let Ok((payload, header)) = result {
println!("return: {:?}, payload: {}", header, payload.len());
} else {
println!("return: Incomplete data");
}
// assert_eq!(1, 0);
}
#[test]
fn ipv6_routing_extension_decode() {
/*
* Internet Protocol Version 6, Src: 2200::244:212:3fff:feae:22f7, Dst: 2200::240:2:0:0:4
* 0110 .... = Version: 6
* .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
* .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
* .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
* Payload Length: 32
* Next Header: Routing Header for IPv6 (43)
* Hop Limit: 4
* Source Address: 2200::244:212:3fff:feae:22f7
* Destination Address: 2200::240:2:0:0:4
* [Source SLAAC MAC: Dell_ae:22:f7 (00:12:3f:ae:22:f7)]
* Routing Header for IPv6 (Segment Routing)
* Next Header: ICMPv6 (58)
* Length: 2
* [Length: 24 bytes]
* Type: Segment Routing (4)
* Segments Left: 1
* Last Entry: 0
* Flags: 0x00
* Tag: 0000
* Address[0]: 2200::210:2:0:0:4
*/
let bytes = [
0x60, 0x00, 0x00, 0x00, 0x00, 0x20, 0x2b, 0x04, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00,
0x02, 0x44, 0x02, 0x12, 0x3f, 0xff, 0xfe, 0xae, 0x22, 0xf7, 0x22, 0x00, 0x00, 0x00,
0x00, 0x00, 0x02, 0x40, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x3a, 0x02,
0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x10,
0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, /* Extensions Data */
0xff, /* Payload */
];
let expectation = Ipv6Header {
version: 6,
dsc: 0,
ecn: 0,
flow_label: 0,
length: 32,
next_header: IPProtocol::IPV6ROUTING,
hop_limit: 4,
source_address: Ipv6Addr::new(
0x2200, 0x0000, 0x0000, 0x0244, 0x0212, 0x3fff, 0xfeae, 0x22f7,
),
dest_address: Ipv6Addr::new(
0x2200, 0x0000, 0x0000, 0x0240, 0x0002, 0x0000, 0x0000, 0x0004,
),
extensions: vec![Ipv6Extension {
next_header: IPProtocol::ICMP6,
ext_length: 24,
data: vec![
0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0x10, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04,
],
}],
};
assert_eq!(Ipv6Header::decode(&bytes), Ok((LAST_SLICE, expectation)));
// example
let result = Ipv6Header::decode(&bytes);
if let Ok((payload, header)) = result {
println!("return: {:?}, payload: {}", header, payload.len());
} else {
println!("return: Incomplete data");
}
// assert_eq!(1, 0);
}
#[test]
fn ipv6_auth_extension_decode() {
// TODO need test
}
#[test]
fn ipv6_mutil_extension_decode() {
/*
* Internet Protocol Version 6, Src: ::1, Dst: ::3
* 0110 .... = Version: 6
* .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
* .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
* .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
* .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
* Payload Length: 32
* Next Header: IPv6 Hop-by-Hop Option (0)
* Hop Limit: 64
* Source Address: ::1
* Destination Address: ::3
* IPv6 Hop-by-Hop Option
* Next Header: Destination Options for IPv6 (60)
* Length: 0
* [Length: 8 bytes]
* PadN
* Type: PadN (0x01)
* 00.. .... = Action: Skip and continue (0)
* ..0. .... = May Change: No
* ...0 0001 = Low-Order Bits: 0x01
* Length: 4
* PadN: 00000000
* Destination Options for IPv6
* Next Header: Routing Header for IPv6 (43)
* Length: 0
* [Length: 8 bytes]
* PadN
* Type: PadN (0x01)
* 00.. .... = Action: Skip and continue (0)
* ..0. .... = May Change: No
* ...0 0001 = Low-Order Bits: 0x01
* Length: 4
* PadN: 00000000
* Routing Header for IPv6 (Source Route)
* Next Header: Fragment Header for IPv6 (44)
* Length: 0
* [Length: 8 bytes]
* Type: Source Route (0)
* [Expert Info (Note/Deprecated): Routing header type is deprecated]
* [Routing header type is deprecated]
* [Severity level: Note]
* [Group: Deprecated]
* Segments Left: 0
* Reserved: 00000000
* Fragment Header for IPv6
* Next header: No Next Header for IPv6 (59)
* Reserved octet: 0x00
* 0000 0000 0000 0... = Offset: 0 (0 bytes)
* .... .... .... .00. = Reserved bits: 0
* .... .... .... ...0 = More Fragments: No
* Identification: 0x00000000
*/
let bytes = [
0x60, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x3c, 0x00,
0x01, 0x04, 0x00, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x01, 0x04, 0x00, 0x00, 0x00, 0x00,
0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3b, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, /* Extensions Data */
0xff, /* Payload */
];
let expectation = Ipv6Header {
version: 6,
dsc: 0,
ecn: 0,
flow_label: 0,
length: 32,
next_header: IPProtocol::IPV6HOP,
hop_limit: 64,
source_address: Ipv6Addr::new(
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0001,
),
dest_address: Ipv6Addr::new(
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0003,
),
extensions: vec![
Ipv6Extension {
next_header: IPProtocol::IPV6DEST,
ext_length: 8,
data: vec![0x01, 0x04, 0x00, 0x00, 0x00, 0x00],
},
Ipv6Extension {
next_header: IPProtocol::IPV6ROUTING,
ext_length: 8,
data: vec![0x01, 0x04, 0x00, 0x00, 0x00, 0x00],
},
Ipv6Extension {
next_header: IPProtocol::IPV6FRAGMENT,
ext_length: 8,
data: vec![0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
},
Ipv6Extension {
next_header: IPProtocol::Other(59),
ext_length: 8,
data: vec![0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
},
],
};
assert_eq!(Ipv6Header::decode(&bytes), Ok((LAST_SLICE, expectation)));
// example
let result = Ipv6Header::decode(&bytes);
if let Ok((payload, header)) = result {
println!("return: {:?}, payload: {}", header, payload.len());
} else {
println!("return: Incomplete data");
}
// assert_eq!(1, 0);
}
}
|
