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use crate::{
err::{ip, Layer, LenError},
*,
};
/// Slice containing the IP header (v4 or v6), extension headers &
/// payload.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum IpSlice<'a> {
/// The ipv4 header & the decoded extension headers.
Ipv4(Ipv4Slice<'a>),
/// The ipv6 header & the decoded extension headers.
Ipv6(Ipv6Slice<'a>),
}
impl<'a> IpSlice<'a> {
/// Returns a reference to the `Ipv4Slice` if `self` is a `IpSlice::Ipv4`.
pub fn ipv4(&self) -> Option<&Ipv4Slice> {
use IpSlice::*;
match self {
Ipv4(slice) => Some(slice),
Ipv6(_) => None,
}
}
/// Returns a reference to the `Ipv6Slice` if `self` is a `IpSlice::Ipv6`.
pub fn ipv6(&self) -> Option<&Ipv6Slice> {
use IpSlice::*;
match self {
Ipv4(_) => None,
Ipv6(slice) => Some(slice),
}
}
/// Returns true if the payload is fragmented.
pub fn is_fragmenting_payload(&self) -> bool {
match self {
IpSlice::Ipv4(s) => s.is_payload_fragmented(),
IpSlice::Ipv6(s) => s.is_payload_fragmented(),
}
}
/// Return the source address as an std::net::Ipvddr (requires
/// crate feature `std`).
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub fn source_addr(&self) -> std::net::IpAddr {
match self {
IpSlice::Ipv4(s) => s.header().source_addr().into(),
IpSlice::Ipv6(s) => s.header().source_addr().into(),
}
}
/// Return the destination address as an std::net::IpAddr (requires
/// crate feature `std`).
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub fn destination_addr(&self) -> std::net::IpAddr {
match self {
IpSlice::Ipv4(s) => s.header().destination_addr().into(),
IpSlice::Ipv6(s) => s.header().destination_addr().into(),
}
}
/// Returns a slice containing the data after the IP header
/// and IP extensions headers.
#[inline]
pub fn payload(&self) -> &IpPayloadSlice<'a> {
use IpSlice::*;
match self {
Ipv4(ipv4) => ipv4.payload(),
Ipv6(ipv6) => ipv6.payload(),
}
}
/// Returns the ip number the type of payload of the IP packet.
///
/// This function returns the ip number stored in the last
/// IP header or extension header.
#[inline]
pub fn payload_ip_number(&self) -> IpNumber {
use IpSlice::*;
match self {
Ipv4(ipv4) => ipv4.payload().ip_number,
Ipv6(ipv6) => ipv6.payload().ip_number,
}
}
/// Separates and validates IP headers (including extension headers)
/// in the given slice and determine the sub-slice containing the payload
/// of the IP packet.
pub fn from_slice(slice: &[u8]) -> Result<IpSlice, err::ip::SliceError> {
use crate::ip_number::AUTH;
use err::ip::{HeaderError::*, HeadersError::*, SliceError::*};
use IpSlice::*;
if slice.is_empty() {
Err(Len(err::LenError {
required_len: 1,
len: slice.len(),
len_source: LenSource::Slice,
layer: err::Layer::IpHeader,
layer_start_offset: 0,
}))
} else {
// SAFETY: Safe as slice is not empty.
let first_byte = unsafe { slice.get_unchecked(0) };
match first_byte >> 4 {
4 => {
let ihl = first_byte & 0xf;
// check that the ihl has at least the length of the base IPv4 header
if ihl < 5 {
return Err(IpHeaders(Ip(Ipv4HeaderLengthSmallerThanHeader { ihl })));
}
// check there is enough data for the header
let header_len = (usize::from(ihl)) * 4;
if slice.len() < header_len {
return Err(Len(err::LenError {
required_len: header_len,
len: slice.len(),
len_source: LenSource::Slice,
layer: err::Layer::Ipv4Header,
layer_start_offset: 0,
}));
}
// SAFETY:
// Safe as the slice length is checked to be at least
// header_len or greater above.
let header = unsafe {
Ipv4HeaderSlice::from_slice_unchecked(core::slice::from_raw_parts(
slice.as_ptr(),
header_len,
))
};
// check the total_length at least contains the header
let total_len = usize::from(header.total_len());
if total_len < header_len {
return Err(Len(LenError {
required_len: header_len,
len: total_len,
len_source: LenSource::Ipv4HeaderTotalLen,
layer: Layer::Ipv4Packet,
layer_start_offset: 0,
}));
}
// validate the total length against the slice
let header_payload = if slice.len() < total_len {
return Err(Len(LenError {
required_len: total_len,
len: slice.len(),
len_source: LenSource::Slice,
layer: Layer::Ipv4Packet,
layer_start_offset: 0,
}));
} else {
unsafe {
core::slice::from_raw_parts(
// SAFETY: Safe as slice.len() >= header_len was validated
// in a if statement above.
slice.as_ptr().add(header_len),
// SAFETY: Safe as total_length >= header_len was verified in an
// if statement above as well as that slice.len() >= total_length_usize.
total_len - header_len,
)
}
};
// slice extension headers
// decode the authentication header if needed
let fragmented = header.is_fragmenting_payload();
match header.protocol() {
AUTH => {
use crate::err::ip_auth::HeaderSliceError as E;
// parse extension headers
let auth = match IpAuthHeaderSlice::from_slice(header_payload) {
Ok(s) => s,
Err(err) => match err {
E::Len(mut l) => {
// change the length source to the ipv4 header
l.len_source = LenSource::Ipv4HeaderTotalLen;
l.layer_start_offset += header.slice().len();
return Err(Len(l));
}
E::Content(err) => {
return Err(IpHeaders(ip::HeadersError::Ipv4Ext(err)))
}
},
};
// remove the extension header from the payload
let payload = unsafe {
core::slice::from_raw_parts(
header_payload.as_ptr().add(auth.slice().len()),
header_payload.len() - auth.slice().len(),
)
};
Ok(Ipv4(Ipv4Slice {
header,
exts: Ipv4ExtensionsSlice { auth: Some(auth) },
payload: IpPayloadSlice {
ip_number: auth.next_header(),
fragmented,
len_source: LenSource::Ipv4HeaderTotalLen,
payload,
},
}))
}
ip_number => Ok(Ipv4(Ipv4Slice {
header,
exts: Ipv4ExtensionsSlice { auth: None },
payload: IpPayloadSlice {
ip_number,
fragmented,
len_source: LenSource::Ipv4HeaderTotalLen,
payload: header_payload,
},
})),
}
}
6 => {
// check length
if slice.len() < Ipv6Header::LEN {
return Err(Len(err::LenError {
required_len: Ipv6Header::LEN,
len: slice.len(),
len_source: LenSource::Slice,
layer: err::Layer::Ipv6Header,
layer_start_offset: 0,
}));
}
let header = unsafe {
Ipv6HeaderSlice::from_slice_unchecked(core::slice::from_raw_parts(
slice.as_ptr(),
Ipv6Header::LEN,
))
};
// restrict slice by the length specified in the header
let (header_payload, len_source) =
if 0 == header.payload_length() && slice.len() > Ipv6Header::LEN {
// In case the payload_length is 0 assume that the entire
// rest of the slice is part of the packet until the jumbogram
// parameters can be parsed.
// TODO: Add payload length parsing from the jumbogram
(
unsafe {
core::slice::from_raw_parts(
slice.as_ptr().add(Ipv6Header::LEN),
slice.len() - Ipv6Header::LEN,
)
},
LenSource::Slice,
)
} else {
let payload_len = usize::from(header.payload_length());
let expected_len = Ipv6Header::LEN + payload_len;
if slice.len() < expected_len {
return Err(Len(LenError {
required_len: expected_len,
len: slice.len(),
len_source: LenSource::Slice,
layer: Layer::Ipv6Packet,
layer_start_offset: 0,
}));
} else {
(
unsafe {
core::slice::from_raw_parts(
slice.as_ptr().add(Ipv6Header::LEN),
payload_len,
)
},
LenSource::Ipv6HeaderPayloadLen,
)
}
};
// parse extension headers
let (exts, payload_ip_number, payload) =
Ipv6ExtensionsSlice::from_slice(header.next_header(), header_payload)
.map_err(|err| {
// modify length errors
use crate::err::ipv6_exts::HeaderSliceError as I;
match err {
I::Len(mut err) => {
err.len_source = LenSource::Ipv6HeaderPayloadLen;
err.layer_start_offset += Ipv6Header::LEN;
Len(err)
}
I::Content(err) => IpHeaders(ip::HeadersError::Ipv6Ext(err)),
}
})?;
let fragmented = exts.is_fragmenting_payload();
Ok(Ipv6(Ipv6Slice {
header,
exts,
payload: IpPayloadSlice {
ip_number: payload_ip_number,
fragmented,
len_source,
payload,
},
}))
}
version_number => Err(IpHeaders(Ip(UnsupportedIpVersion { version_number }))),
}
}
}
}
impl<'a> From<Ipv4Slice<'a>> for IpSlice<'a> {
fn from(value: Ipv4Slice<'a>) -> Self {
IpSlice::Ipv4(value)
}
}
impl<'a> From<Ipv6Slice<'a>> for IpSlice<'a> {
fn from(value: Ipv6Slice<'a>) -> Self {
IpSlice::Ipv6(value)
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::test_gens::*;
use alloc::{format, vec::Vec};
use proptest::prelude::*;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
#[test]
fn debug_clone_eq() {
// ipv4
{
let mut header: Ipv4Header = Default::default();
header.protocol = ip_number::UDP;
header.set_payload_len(0).unwrap();
let buffer = header.to_bytes();
let ipv4 = Ipv4Slice::from_slice(&buffer).unwrap();
let slice = IpSlice::Ipv4(ipv4.clone());
// clone & eq
assert_eq!(slice.clone(), slice);
// debug
assert_eq!(format!("{:?}", slice), format!("Ipv4({:?})", ipv4));
}
// ipv6
{
let header = Ipv6Header {
payload_length: 0,
next_header: ip_number::UDP,
..Default::default()
};
let buffer = header.to_bytes();
let ipv6 = Ipv6Slice::from_slice(&buffer).unwrap();
let slice = IpSlice::Ipv6(ipv6.clone());
// clone & eq
assert_eq!(slice.clone(), slice);
// debug
assert_eq!(format!("{:?}", slice), format!("Ipv6({:?})", ipv6));
}
}
#[test]
fn is_fragmenting_payload() {
for fragment in [false, true] {
use ip_number::UDP;
// ipv4
{
let mut ipv4 = Ipv4Header::new(0, 1, UDP, [3, 4, 5, 6], [7, 8, 9, 10]).unwrap();
if fragment {
ipv4.fragment_offset = 123.try_into().unwrap();
}
let data = ipv4.to_bytes();
let ipv4_slice = Ipv4Slice::from_slice(&data).unwrap();
assert_eq!(fragment, IpSlice::Ipv4(ipv4_slice).is_fragmenting_payload());
}
// ipv6
{
let ipv6_frag = Ipv6FragmentHeader {
next_header: UDP,
fragment_offset: IpFragOffset::ZERO,
more_fragments: fragment,
identification: 0,
};
let ipv6 = Ipv6Header {
traffic_class: 0,
flow_label: 1.try_into().unwrap(),
payload_length: ipv6_frag.header_len() as u16,
next_header: ip_number::IPV6_FRAG,
hop_limit: 4,
source: [1; 16],
destination: [2; 16],
};
let mut data = Vec::with_capacity(ipv6.header_len() + ipv6_frag.header_len());
data.extend_from_slice(&ipv6.to_bytes());
data.extend_from_slice(&ipv6_frag.to_bytes());
assert_eq!(
fragment,
IpSlice::Ipv6(Ipv6Slice::from_slice(&data).unwrap()).is_fragmenting_payload()
);
}
}
}
#[cfg(feature = "std")]
#[test]
fn source_addr() {
// ipv4
{
let data = Ipv4Header::new(0, 1, 2.into(), [3, 4, 5, 6], [7, 8, 9, 10])
.unwrap()
.to_bytes();
assert_eq!(
IpAddr::V4(Ipv4Addr::from([3, 4, 5, 6])),
IpSlice::Ipv4(Ipv4Slice::from_slice(&data[..]).unwrap()).source_addr()
);
}
// ipv6
{
let data = Ipv6Header {
traffic_class: 0,
flow_label: 1.try_into().unwrap(),
payload_length: 0,
next_header: ip_number::IGMP,
hop_limit: 4,
source: [1; 16],
destination: [2; 16],
}
.to_bytes();
assert_eq!(
IpAddr::V6(Ipv6Addr::from([1; 16])),
IpSlice::Ipv6(Ipv6Slice::from_slice(&data[..]).unwrap()).source_addr()
);
}
}
#[cfg(feature = "std")]
#[test]
fn destination_addr() {
use crate::ip_number::UDP;
// ipv4
{
let data = Ipv4Header::new(0, 1, UDP, [3, 4, 5, 6], [7, 8, 9, 10])
.unwrap()
.to_bytes();
assert_eq!(
IpAddr::V4(Ipv4Addr::from([7, 8, 9, 10])),
IpSlice::Ipv4(Ipv4Slice::from_slice(&data[..]).unwrap()).destination_addr()
);
}
// ipv6
{
let data = Ipv6Header {
traffic_class: 0,
flow_label: 1.try_into().unwrap(),
payload_length: 0,
next_header: ip_number::IGMP,
hop_limit: 4,
source: [1; 16],
destination: [2; 16],
}
.to_bytes();
assert_eq!(
IpAddr::V6(Ipv6Addr::from([2; 16])),
IpSlice::Ipv6(Ipv6Slice::from_slice(&data).unwrap()).destination_addr()
);
}
}
#[test]
fn payload() {
let payload: [u8; 4] = [1, 2, 3, 4];
// ipv4
{
let header = Ipv4Header::new(
payload.len() as u16,
1,
ip_number::UDP,
[3, 4, 5, 6],
[7, 8, 9, 10],
)
.unwrap();
let mut data = Vec::with_capacity(header.header_len() + payload.len());
data.extend_from_slice(&header.to_bytes());
data.extend_from_slice(&payload);
assert_eq!(
IpSlice::Ipv4(Ipv4Slice::from_slice(&data[..]).unwrap()).payload(),
&IpPayloadSlice {
ip_number: ip_number::UDP.into(),
fragmented: header.is_fragmenting_payload(),
len_source: LenSource::Ipv4HeaderTotalLen,
payload: &payload,
}
);
}
// ipv6
{
let header = Ipv6Header {
traffic_class: 0,
flow_label: 1.try_into().unwrap(),
payload_length: payload.len() as u16,
next_header: ip_number::UDP,
hop_limit: 4,
source: [1; 16],
destination: [2; 16],
};
let mut data = Vec::with_capacity(header.header_len() + payload.len());
data.extend_from_slice(&header.to_bytes());
data.extend_from_slice(&payload);
assert_eq!(
IpSlice::Ipv6(Ipv6Slice::from_slice(&data[..]).unwrap()).payload(),
&IpPayloadSlice {
ip_number: ip_number::UDP.into(),
fragmented: false,
len_source: LenSource::Ipv6HeaderPayloadLen,
payload: &payload,
}
);
}
}
#[test]
fn payload_ip_number() {
use crate::ip_number::{IGMP, UDP};
// ipv4
{
let data = Ipv4Header::new(0, 1, UDP, [3, 4, 5, 6], [7, 8, 9, 10])
.unwrap()
.to_bytes();
assert_eq!(
UDP,
IpSlice::Ipv4(Ipv4Slice::from_slice(&data[..]).unwrap()).payload_ip_number()
);
}
// ipv6
{
let data = Ipv6Header {
traffic_class: 0,
flow_label: 1.try_into().unwrap(),
payload_length: 0,
next_header: IGMP,
hop_limit: 4,
source: [1; 16],
destination: [2; 16],
}
.to_bytes();
assert_eq!(
IGMP,
IpSlice::Ipv6(Ipv6Slice::from_slice(&data).unwrap()).payload_ip_number()
);
}
}
proptest! {
#[test]
fn from_ip_slice(
ipv4_header in ipv4_any(),
ipv4_exts in ipv4_extensions_with(ip_number::UDP),
ipv6_header in ipv6_any(),
mut ipv6_exts in ipv6_extensions_with(ip_number::UDP)
) {
let payload = [1,2,3,4];
// setup header length & fields
let ipv4_header = {
let mut header = ipv4_header;
header.protocol = if ipv4_exts.auth.is_some() {
ip_number::AUTH
} else {
ip_number::UDP
};
header.total_len = (header.header_len() + ipv4_exts.header_len() + payload.len()) as u16;
header.header_checksum = header.calc_header_checksum();
header
};
let ipv4 = IpHeaders::Ipv4(
ipv4_header.clone(),
ipv4_exts.clone()
);
let ipv6_header = {
let mut header = ipv6_header;
header.next_header = ipv6_exts.set_next_headers(ip_number::UDP);
header.payload_length = (ipv6_exts.header_len() + payload.len()) as u16;
header
};
let ipv6 = IpHeaders::Ipv6(
ipv6_header.clone(),
ipv6_exts.clone()
);
// happy path v4
{
// build packet
let mut data = Vec::with_capacity(ipv4.header_len() + payload.len());
ipv4.write(&mut data).unwrap();
data.extend_from_slice(&payload);
// run test
let actual = IpSlice::from_slice(&data).unwrap();
assert!(actual.ipv6().is_none());
let actual = actual.ipv4().unwrap().clone();
assert_eq!(actual.header.to_header(), ipv4_header);
assert_eq!(actual.extensions().to_header(), ipv4_exts);
assert_eq!(
actual.payload,
IpPayloadSlice{
ip_number: ip_number::UDP.into(),
fragmented: ipv4_header.is_fragmenting_payload(),
len_source: LenSource::Ipv4HeaderTotalLen,
payload: &payload
}
);
}
// happy path v6
{
// build packet
let mut data = Vec::with_capacity(ipv6.header_len() + payload.len());
ipv6.write(&mut data).unwrap();
data.extend_from_slice(&payload);
// run test
let actual = crate::IpSlice::from_slice(&data).unwrap();
assert!(actual.ipv4().is_none());
let actual = actual.ipv6().unwrap().clone();
assert_eq!(actual.header.to_header(), ipv6_header);
assert_eq!(
Ipv6Extensions::from_slice(
ipv6_header.next_header,
actual.extensions().slice()
).unwrap().0,
ipv6_exts
);
assert_eq!(
actual.payload,
IpPayloadSlice{
ip_number: ip_number::UDP.into(),
fragmented: ipv6_exts.is_fragmenting_payload(),
len_source: LenSource::Ipv6HeaderPayloadLen,
payload: &payload
}
);
}
// ipv6 with zero payload length (should fallback to the slice length)
{
let ipv6_header = {
let mut header = ipv6_header.clone();
// set the payload length to zero so the payload identifier
// has to fallback to the slice length
header.payload_length = 0;
header
};
// build packet
let mut data = Vec::with_capacity(ipv6.header_len() + payload.len());
ipv6_header.write(&mut data).unwrap();
ipv6_exts.write(&mut data, ipv6_header.next_header).unwrap();
data.extend_from_slice(&payload);
// run test
let actual = crate::IpSlice::from_slice(&data).unwrap();
assert!(actual.ipv4().is_none());
let actual = actual.ipv6().unwrap().clone();
assert_eq!(actual.header.to_header(), ipv6_header);
assert_eq!(
Ipv6Extensions::from_slice(
ipv6_header.next_header,
actual.extensions().slice()
).unwrap().0,
ipv6_exts
);
assert_eq!(
actual.payload,
IpPayloadSlice{
ip_number: ip_number::UDP.into(),
fragmented: ipv6_exts.is_fragmenting_payload(),
len_source: LenSource::Slice,
payload: &payload
}
);
}
}
}
proptest! {
#[test]
fn from_ipv4_slice(
ipv4_header in ipv4_unknown()
) {
let mut header = ipv4_header.clone();
header.total_len = (header.header_len() + 4) as u16;
let mut buffer = Vec::with_capacity(header.total_len.into());
buffer.extend_from_slice(&header.to_bytes()[..]);
buffer.extend_from_slice(&[1,2,3,4]);
let s = Ipv4Slice::from_slice(&buffer).unwrap();
let actual: IpSlice = s.clone().into();
assert_eq!(IpSlice::Ipv4(s), actual);
}
}
proptest! {
#[test]
fn from_ipv6_slice(
ipv6_header in ipv6_unknown()
) {
let mut header = ipv6_header.clone();
header.payload_length = 4;
let mut buffer = Vec::with_capacity(header.header_len() + 4);
buffer.extend_from_slice(&header.to_bytes()[..]);
buffer.extend_from_slice(&[1,2,3,4]);
let s = Ipv6Slice::from_slice(&buffer).unwrap();
let actual: IpSlice = s.clone().into();
assert_eq!(IpSlice::Ipv6(s), actual);
}
}
}