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Send ICMP unreachable when no UDP socket is found

master
Thibaut Vandervelden 2021-10-11 09:58:22 +02:00 committed by Dario Nieuwenhuis
parent b068a856e5
commit 80ba5a2e2d
2 changed files with 36 additions and 21 deletions
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53
src/iface/interface.rs
View File

@ -1158,26 +1158,36 @@ impl<'a> InterfaceInner<'a> {
}
}
// The packet wasn't handled by a socket, send an ICMP port unreachable packet.
match ip_repr {
#[cfg(feature = "proto-ipv6")]
IpRepr::Ipv6(ipv6_repr) => {
let payload_len = icmp_reply_payload_len(
payload.len(),
IPV6_MIN_MTU,
ipv6_repr.buffer_len(),
);
let icmpv6_reply_repr = Icmpv6Repr::DstUnreachable {
reason: Icmpv6DstUnreachable::PortUnreachable,
header: ipv6_repr,
data: &payload[0..payload_len],
};
Ok(self.icmpv6_reply(ipv6_repr, icmpv6_reply_repr))
}
IpRepr::Unspecified { .. } => Err(Error::Unaddressable),
IpRepr::Sixlowpan(_) => Err(Error::Malformed), // XXX(thvdveld): this is just wrong;
r => todo!("{:?}", r),
}
// TODO(thvdveld): verify this implementation of sending an ICMP
let src_addr = match ip_repr.src_addr() {
IpAddress::Ipv6(addr) => addr,
_ => unreachable!(),
};
let dst_addr = match ip_repr.dst_addr() {
IpAddress::Ipv6(addr) => addr,
_ => unreachable!(),
};
let ipv6_repr = Ipv6Repr {
src_addr,
dst_addr,
hop_limit: ip_repr.hop_limit(),
next_header: IpProtocol::Unknown(0),
payload_len: ip_repr.payload_len(),
};
let payload_len = icmp_reply_payload_len(
payload.len(),
IPV6_MIN_MTU,
ipv6_repr.buffer_len(),
);
let icmpv6_reply_repr = Icmpv6Repr::DstUnreachable {
reason: Icmpv6DstUnreachable::PortUnreachable,
header: ipv6_repr,
data: &payload[0..payload_len],
};
Ok(self.icmpv6_reply(ipv6_repr, icmpv6_reply_repr))
}
}
}
@ -2284,7 +2294,8 @@ impl<'a> InterfaceInner<'a> {
&ip_repr.dst_addr(),
)? {
(HardwareAddress::Ethernet(addr), tx_token) => (addr, tx_token),
_ => unreachable!(),
#[cfg(feature = "medium-ieee802154")]
(HardwareAddress::Ieee802154(_), _) => unreachable!(),
};
self.dispatch_ethernet(cx, tx_token, ip_repr.total_len(), |mut frame| {

4
src/wire/mod.rs
View File

@ -341,6 +341,10 @@ impl RawHardwareAddress {
self.len as usize
}
pub fn is_empty(&self) -> bool {
self.len == 0
}
pub fn parse(&self, medium: Medium) -> Result<HardwareAddress, Error> {
match medium {
#[cfg(feature = "medium-ethernet")]