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Remove "None" variant from Packet, use Option<Packet> instead.

This commit is contained in:
Dario Nieuwenhuis 2020-04-19 02:59:56 +02:00
parent 71a5e41b9e
commit 2d7b150984
1 changed files with 76 additions and 75 deletions
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151
src/iface/ethernet.rs
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@ -269,7 +269,6 @@ impl<'b, 'c, 'e, DeviceT> InterfaceBuilder<'b, 'c, 'e, DeviceT>
#[derive(Debug, PartialEq)]
enum Packet<'a> {
None,
#[cfg(feature = "proto-ipv4")]
Arp(ArpRepr),
#[cfg(feature = "proto-ipv4")]
@ -289,7 +288,6 @@ enum Packet<'a> {
impl<'a> Packet<'a> {
fn neighbor_addr(&self) -> Option<IpAddress> {
match *self {
Packet::None => None,
#[cfg(feature = "proto-ipv4")]
Packet::Arp(_) => None,
#[cfg(feature = "proto-ipv4")]
@ -562,10 +560,15 @@ impl<'b, 'c, 'e, DeviceT> Interface<'b, 'c, 'e, DeviceT>
err
}).and_then(|response| {
processed_any = true;
inner.dispatch(tx_token, timestamp, response).map_err(|err| {
net_debug!("cannot dispatch response packet: {}", err);
err
})
match response {
Some(packet) => {
inner.dispatch(tx_token, timestamp, packet).map_err(|err| {
net_debug!("cannot dispatch response packet: {}", err);
err
})
}
None => Ok(())
}
})
})?;
}
@ -768,7 +771,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
fn process_ethernet<'frame, T: AsRef<[u8]>>
(&mut self, sockets: &mut SocketSet, timestamp: Instant, frame: &'frame T) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let eth_frame = EthernetFrame::new_checked(frame)?;
@ -777,7 +780,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
!eth_frame.dst_addr().is_multicast() &&
eth_frame.dst_addr() != self.ethernet_addr
{
return Ok(Packet::None)
return Ok(None)
}
match eth_frame.ethertype() {
@ -798,7 +801,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "proto-ipv4")]
fn process_arp<'frame, T: AsRef<[u8]>>
(&mut self, timestamp: Instant, eth_frame: &EthernetFrame<&'frame T>) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let arp_packet = ArpPacket::new_checked(eth_frame.payload())?;
let arp_repr = ArpRepr::parse(&arp_packet)?;
@ -821,15 +824,15 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
}
if operation == ArpOperation::Request && self.has_ip_addr(target_protocol_addr) {
Ok(Packet::Arp(ArpRepr::EthernetIpv4 {
Ok(Some(Packet::Arp(ArpRepr::EthernetIpv4 {
operation: ArpOperation::Reply,
source_hardware_addr: self.ethernet_addr,
source_protocol_addr: target_protocol_addr,
target_hardware_addr: source_hardware_addr,
target_protocol_addr: source_protocol_addr
}))
})))
} else {
Ok(Packet::None)
Ok(None)
}
}
@ -863,7 +866,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
fn process_ipv6<'frame, T: AsRef<[u8]>>
(&mut self, sockets: &mut SocketSet, timestamp: Instant,
eth_frame: &EthernetFrame<&'frame T>) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let ipv6_packet = Ipv6Packet::new_checked(eth_frame.payload())?;
let ipv6_repr = Ipv6Repr::parse(&ipv6_packet)?;
@ -900,7 +903,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
fn process_nxt_hdr<'frame>
(&mut self, sockets: &mut SocketSet, timestamp: Instant, ipv6_repr: Ipv6Repr,
nxt_hdr: IpProtocol, handled_by_raw_socket: bool, ip_payload: &'frame [u8])
-> Result<Packet<'frame>>
-> Result<Option<Packet<'frame>>>
{
match nxt_hdr {
IpProtocol::Icmpv6 =>
@ -919,7 +922,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "socket-raw")]
_ if handled_by_raw_socket =>
Ok(Packet::None),
Ok(None),
_ => {
// Send back as much of the original payload as we can.
@ -941,7 +944,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
fn process_ipv4<'frame, T: AsRef<[u8]>>
(&mut self, sockets: &mut SocketSet, timestamp: Instant,
eth_frame: &EthernetFrame<&'frame T>) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let ipv4_packet = Ipv4Packet::new_checked(eth_frame.payload())?;
let checksum_caps = self.device_capabilities.checksum.clone();
@ -975,12 +978,12 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
// Ignore IP packets not directed at us, or broadcast, or any of the multicast groups.
// If AnyIP is enabled, also check if the packet is routed locally.
if !self.any_ip {
return Ok(Packet::None);
return Ok(None);
} else if match self.routes.lookup(&IpAddress::Ipv4(ipv4_repr.dst_addr), timestamp) {
Some(router_addr) => !self.has_ip_addr(router_addr),
None => true,
} {
return Ok(Packet::None);
return Ok(None);
}
}
@ -1001,7 +1004,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
self.process_tcp(sockets, timestamp, ip_repr, ip_payload),
_ if handled_by_raw_socket =>
Ok(Packet::None),
Ok(None),
_ => {
// Send back as much of the original payload as we can.
@ -1024,7 +1027,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
/// after a query is broadcasted by a router; this is not currently done.
#[cfg(feature = "proto-igmp")]
fn process_igmp<'frame>(&mut self, timestamp: Instant, ipv4_repr: Ipv4Repr,
ip_payload: &'frame [u8]) -> Result<Packet<'frame>> {
ip_payload: &'frame [u8]) -> Result<Option<Packet<'frame>>> {
let igmp_packet = IgmpPacket::new_checked(ip_payload)?;
let igmp_repr = IgmpRepr::parse(&igmp_packet)?;
@ -1068,12 +1071,12 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
IgmpRepr::LeaveGroup{ .. } => (),
}
Ok(Packet::None)
Ok(None)
}
#[cfg(feature = "proto-ipv6")]
fn process_icmpv6<'frame>(&mut self, _sockets: &mut SocketSet, timestamp: Instant,
ip_repr: IpRepr, ip_payload: &'frame [u8]) -> Result<Packet<'frame>>
ip_repr: IpRepr, ip_payload: &'frame [u8]) -> Result<Option<Packet<'frame>>>
{
let icmp_packet = Icmpv6Packet::new_checked(ip_payload)?;
let checksum_caps = self.device_capabilities.checksum.clone();
@ -1114,18 +1117,18 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
}
// Ignore any echo replies.
Icmpv6Repr::EchoReply { .. } => Ok(Packet::None),
Icmpv6Repr::EchoReply { .. } => Ok(None),
// Forward any NDISC packets to the ndisc packet handler
Icmpv6Repr::Ndisc(repr) if ip_repr.hop_limit() == 0xff => match ip_repr {
IpRepr::Ipv6(ipv6_repr) => self.process_ndisc(timestamp, ipv6_repr, repr),
_ => Ok(Packet::None)
_ => Ok(None)
},
// Don't report an error if a packet with unknown type
// has been handled by an ICMP socket
#[cfg(feature = "socket-icmp")]
_ if handled_by_icmp_socket => Ok(Packet::None),
_ if handled_by_icmp_socket => Ok(None),
// FIXME: do something correct here?
_ => Err(Error::Unrecognized),
@ -1134,8 +1137,8 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "proto-ipv6")]
fn process_ndisc<'frame>(&mut self, timestamp: Instant, ip_repr: Ipv6Repr,
repr: NdiscRepr<'frame>) -> Result<Packet<'frame>> {
let packet = match repr {
repr: NdiscRepr<'frame>) -> Result<Option<Packet<'frame>>> {
match repr {
NdiscRepr::NeighborAdvert { lladdr, target_addr, flags } => {
let ip_addr = ip_repr.src_addr.into();
match lladdr {
@ -1150,7 +1153,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
},
_ => (),
}
Ok(Packet::None)
Ok(None)
}
NdiscRepr::NeighborSolicit { target_addr, lladdr, .. } => {
match lladdr {
@ -1172,20 +1175,19 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
hop_limit: 0xff,
payload_len: advert.buffer_len()
};
Ok(Packet::Icmpv6((ip_repr, advert)))
Ok(Some(Packet::Icmpv6((ip_repr, advert))))
} else {
Ok(Packet::None)
Ok(None)
}
}
_ => Ok(Packet::None)
};
packet
_ => Ok(None)
}
}
#[cfg(feature = "proto-ipv6")]
fn process_hopbyhop<'frame>(&mut self, sockets: &mut SocketSet, timestamp: Instant,
ipv6_repr: Ipv6Repr, handled_by_raw_socket: bool,
ip_payload: &'frame [u8]) -> Result<Packet<'frame>>
ip_payload: &'frame [u8]) -> Result<Option<Packet<'frame>>>
{
let hbh_pkt = Ipv6HopByHopHeader::new_checked(ip_payload)?;
let hbh_repr = Ipv6HopByHopRepr::parse(&hbh_pkt)?;
@ -1197,7 +1199,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
match Ipv6OptionFailureType::from(type_) {
Ipv6OptionFailureType::Skip => (),
Ipv6OptionFailureType::Discard => {
return Ok(Packet::None);
return Ok(None);
},
_ => {
// FIXME(dlrobertson): Send an ICMPv6 parameter problem message
@ -1215,7 +1217,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "proto-ipv4")]
fn process_icmpv4<'frame>(&self, _sockets: &mut SocketSet, ip_repr: IpRepr,
ip_payload: &'frame [u8]) -> Result<Packet<'frame>>
ip_payload: &'frame [u8]) -> Result<Option<Packet<'frame>>>
{
let icmp_packet = Icmpv4Packet::new_checked(ip_payload)?;
let checksum_caps = self.device_capabilities.checksum.clone();
@ -1254,12 +1256,12 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
},
// Ignore any echo replies.
Icmpv4Repr::EchoReply { .. } => Ok(Packet::None),
Icmpv4Repr::EchoReply { .. } => Ok(None),
// Don't report an error if a packet with unknown type
// has been handled by an ICMP socket
#[cfg(feature = "socket-icmp")]
_ if handled_by_icmp_socket => Ok(Packet::None),
_ if handled_by_icmp_socket => Ok(None),
// FIXME: do something correct here?
_ => Err(Error::Unrecognized),
@ -1269,11 +1271,11 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "proto-ipv4")]
fn icmpv4_reply<'frame, 'icmp: 'frame>
(&self, ipv4_repr: Ipv4Repr, icmp_repr: Icmpv4Repr<'icmp>) ->
Packet<'frame>
Option<Packet<'frame>>
{
if !ipv4_repr.src_addr.is_unicast() {
// Do not send ICMP replies to non-unicast sources
Packet::None
None
} else if ipv4_repr.dst_addr.is_unicast() {
// Reply as normal when src_addr and dst_addr are both unicast
let ipv4_reply_repr = Ipv4Repr {
@ -1283,7 +1285,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
payload_len: icmp_repr.buffer_len(),
hop_limit: 64
};
Packet::Icmpv4((ipv4_reply_repr, icmp_repr))
Some(Packet::Icmpv4((ipv4_reply_repr, icmp_repr)))
} else if ipv4_repr.dst_addr.is_broadcast() {
// Only reply to broadcasts for echo replies and not other ICMP messages
match icmp_repr {
@ -1296,21 +1298,21 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
payload_len: icmp_repr.buffer_len(),
hop_limit: 64
};
Packet::Icmpv4((ipv4_reply_repr, icmp_repr))
Some(Packet::Icmpv4((ipv4_reply_repr, icmp_repr)))
},
None => Packet::None,
None => None,
},
_ => Packet::None,
_ => None,
}
} else {
Packet::None
None
}
}
#[cfg(feature = "proto-ipv6")]
fn icmpv6_reply<'frame, 'icmp: 'frame>
(&self, ipv6_repr: Ipv6Repr, icmp_repr: Icmpv6Repr<'icmp>) ->
Packet<'frame>
Option<Packet<'frame>>
{
if ipv6_repr.dst_addr.is_unicast() {
let ipv6_reply_repr = Ipv6Repr {
@ -1320,17 +1322,17 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
payload_len: icmp_repr.buffer_len(),
hop_limit: 64
};
Packet::Icmpv6((ipv6_reply_repr, icmp_repr))
Some(Packet::Icmpv6((ipv6_reply_repr, icmp_repr)))
} else {
// Do not send any ICMP replies to a broadcast destination address.
Packet::None
None
}
}
#[cfg(feature = "socket-udp")]
fn process_udp<'frame>(&self, sockets: &mut SocketSet,
ip_repr: IpRepr, handled_by_raw_socket: bool, ip_payload: &'frame [u8]) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let (src_addr, dst_addr) = (ip_repr.src_addr(), ip_repr.dst_addr());
let udp_packet = UdpPacket::new_checked(ip_payload)?;
@ -1342,7 +1344,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
match udp_socket.process(&ip_repr, &udp_repr) {
// The packet is valid and handled by socket.
Ok(()) => return Ok(Packet::None),
Ok(()) => return Ok(None),
// The packet is malformed, or the socket buffer is full.
Err(e) => return Err(e)
}
@ -1352,10 +1354,10 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
match ip_repr {
#[cfg(feature = "proto-ipv4")]
IpRepr::Ipv4(_) if handled_by_raw_socket =>
Ok(Packet::None),
Ok(None),
#[cfg(feature = "proto-ipv6")]
IpRepr::Ipv6(_) if handled_by_raw_socket =>
Ok(Packet::None),
Ok(None),
#[cfg(feature = "proto-ipv4")]
IpRepr::Ipv4(ipv4_repr) => {
let payload_len = icmp_reply_payload_len(ip_payload.len(), IPV4_MIN_MTU,
@ -1386,7 +1388,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
#[cfg(feature = "socket-tcp")]
fn process_tcp<'frame>(&self, sockets: &mut SocketSet, timestamp: Instant,
ip_repr: IpRepr, ip_payload: &'frame [u8]) ->
Result<Packet<'frame>>
Result<Option<Packet<'frame>>>
{
let (src_addr, dst_addr) = (ip_repr.src_addr(), ip_repr.dst_addr());
let tcp_packet = TcpPacket::new_checked(ip_payload)?;
@ -1398,7 +1400,7 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
match tcp_socket.process(timestamp, &ip_repr, &tcp_repr) {
// The packet is valid and handled by socket.
Ok(reply) => return Ok(reply.map_or(Packet::None, Packet::Tcp)),
Ok(reply) => return Ok(reply.map(Packet::Tcp)),
// The packet is malformed, or doesn't match the socket state,
// or the socket buffer is full.
Err(e) => return Err(e)
@ -1407,10 +1409,10 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
if tcp_repr.control == TcpControl::Rst {
// Never reply to a TCP RST packet with another TCP RST packet.
Ok(Packet::None)
Ok(None)
} else {
// The packet wasn't handled by a socket, send a TCP RST packet.
Ok(Packet::Tcp(TcpSocket::rst_reply(&ip_repr, &tcp_repr)))
Ok(Some(Packet::Tcp(TcpSocket::rst_reply(&ip_repr, &tcp_repr))))
}
}
@ -1499,7 +1501,6 @@ impl<'b, 'c, 'e> InterfaceInner<'b, 'c, 'e> {
&checksum_caps);
})
}
Packet::None => Ok(())
}
}
@ -1852,10 +1853,10 @@ mod test {
// broadcast address
#[cfg(all(feature = "proto-ipv4", not(feature = "proto-ipv6")))]
assert_eq!(iface.inner.process_ipv4(&mut socket_set, Instant::from_millis(0), &frame),
Ok(Packet::None));
Ok(None));
#[cfg(feature = "proto-ipv6")]
assert_eq!(iface.inner.process_ipv6(&mut socket_set, Instant::from_millis(0), &frame),
Ok(Packet::None));
Ok(None));
}
#[test]
@ -1913,7 +1914,7 @@ mod test {
// Ensure that the unknown protocol triggers an error response.
// And we correctly handle no payload.
assert_eq!(iface.inner.process_ipv4(&mut socket_set, Instant::from_millis(0), &frame),
Ok(expected_repr));
Ok(Some(expected_repr)));
}
#[test]
@ -1978,7 +1979,7 @@ mod test {
// Ensure that the unknown protocol triggers an error response.
// And we correctly handle no payload.
assert_eq!(iface.inner.process_udp(&mut socket_set, ip_repr, false, data),
Ok(expected_repr));
Ok(Some(expected_repr)));
let ip_repr = IpRepr::Ipv4(Ipv4Repr {
src_addr: Ipv4Address([0x7f, 0x00, 0x00, 0x02]),
@ -1997,7 +1998,7 @@ mod test {
// ICMP error response when the destination address is a
// broadcast address and no socket is bound to the port.
assert_eq!(iface.inner.process_udp(&mut socket_set, ip_repr,
false, packet_broadcast.into_inner()), Ok(Packet::None));
false, packet_broadcast.into_inner()), Ok(None));
}
#[test]
@ -2061,7 +2062,7 @@ mod test {
// Packet should be handled by bound UDP socket
assert_eq!(iface.inner.process_udp(&mut socket_set, ip_repr, false, packet.into_inner()),
Ok(Packet::None));
Ok(None));
{
// Make sure the payload to the UDP packet processed by process_udp is
@ -2127,7 +2128,7 @@ mod test {
let expected_packet = Packet::Icmpv4((expected_ipv4_repr, expected_icmpv4_repr));
assert_eq!(iface.inner.process_ipv4(&mut socket_set, Instant::from_millis(0), &frame),
Ok(expected_packet));
Ok(Some(expected_packet)));
}
#[test]
@ -2219,10 +2220,10 @@ mod test {
// The expected packet and the generated packet are equal
#[cfg(all(feature = "proto-ipv4", not(feature = "proto-ipv6")))]
assert_eq!(iface.inner.process_udp(&mut socket_set, ip_repr.into(), false, payload),
Ok(Packet::Icmpv4((expected_ip_repr, expected_icmp_repr))));
Ok(Some(Packet::Icmpv4((expected_ip_repr, expected_icmp_repr)))));
#[cfg(feature = "proto-ipv6")]
assert_eq!(iface.inner.process_udp(&mut socket_set, ip_repr.into(), false, payload),
Ok(Packet::Icmpv6((expected_ip_repr, expected_icmp_repr))));
Ok(Some(Packet::Icmpv6((expected_ip_repr, expected_icmp_repr)))));
}
#[test]
@ -2256,13 +2257,13 @@ mod test {
// Ensure an ARP Request for us triggers an ARP Reply
assert_eq!(iface.inner.process_ethernet(&mut socket_set, Instant::from_millis(0), frame.into_inner()),
Ok(Packet::Arp(ArpRepr::EthernetIpv4 {
Ok(Some(Packet::Arp(ArpRepr::EthernetIpv4 {
operation: ArpOperation::Reply,
source_hardware_addr: local_hw_addr,
source_protocol_addr: local_ip_addr,
target_hardware_addr: remote_hw_addr,
target_protocol_addr: remote_ip_addr
})));
}))));
// Ensure the address of the requestor was entered in the cache
assert_eq!(iface.inner.lookup_hardware_addr(MockTxToken, Instant::from_secs(0),
@ -2322,7 +2323,7 @@ mod test {
// Ensure an Neighbor Solicitation triggers a Neighbor Advertisement
assert_eq!(iface.inner.process_ethernet(&mut socket_set, Instant::from_millis(0), frame.into_inner()),
Ok(Packet::Icmpv6((ipv6_expected, icmpv6_expected))));
Ok(Some(Packet::Icmpv6((ipv6_expected, icmpv6_expected)))));
// Ensure the address of the requestor was entered in the cache
assert_eq!(iface.inner.lookup_hardware_addr(MockTxToken, Instant::from_secs(0),
@ -2359,7 +2360,7 @@ mod test {
// Ensure an ARP Request for someone else does not trigger an ARP Reply
assert_eq!(iface.inner.process_ethernet(&mut socket_set, Instant::from_millis(0), frame.into_inner()),
Ok(Packet::None));
Ok(None));
// Ensure the address of the requestor was entered in the cache
assert_eq!(iface.inner.lookup_hardware_addr(MockTxToken, Instant::from_secs(0),
@ -2423,7 +2424,7 @@ mod test {
..ipv4_repr
};
assert_eq!(iface.inner.process_icmpv4(&mut socket_set, ip_repr, icmp_data),
Ok(Packet::Icmpv4((ipv4_reply, echo_reply))));
Ok(Some(Packet::Icmpv4((ipv4_reply, echo_reply)))));
{
let mut socket = socket_set.get::<IcmpSocket>(socket_handle);
@ -2513,7 +2514,7 @@ mod test {
// Ensure the unknown next header causes a ICMPv6 Parameter Problem
// error message to be sent to the sender.
assert_eq!(iface.inner.process_ipv6(&mut socket_set, Instant::from_millis(0), &frame),
Ok(Packet::Icmpv6((reply_ipv6_repr, reply_icmp_repr))));
Ok(Some(Packet::Icmpv6((reply_ipv6_repr, reply_icmp_repr)))));
// Ensure the address of the requestor was entered in the cache
assert_eq!(iface.inner.lookup_hardware_addr(MockTxToken, Instant::from_secs(0),
@ -2663,7 +2664,7 @@ mod test {
};
assert_eq!(iface.inner.process_ipv4(&mut socket_set, Instant::from_millis(0), &frame),
Ok(Packet::None));
Ok(None));
}
#[test]
@ -2722,7 +2723,7 @@ mod test {
// because the packet could not be handled we should send an Icmp message
assert!(match frame {
Ok(Packet::Icmpv4(_)) => true,
Ok(Some(Packet::Icmpv4(_))) => true,
_ => false,
});
}
@ -2795,7 +2796,7 @@ mod test {
};
assert_eq!(iface.inner.process_ipv4(&mut socket_set, Instant::from_millis(0), &frame),
Ok(Packet::None));
Ok(None));
{
// Make sure the UDP socket can still receive in presence of a Raw socket that handles UDP