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nic_router_flood.run: test DoS against router

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Currently has three clients that continuously create new UDP/TCP/ICMP
connections through the NIC router with NAT to the outer world and they
get never closed.  A fourth client does normal ping through the same
domain to the outer world that must succeed even after the RAM quota of
the other session at the router is exhausted. The test is restricted to
Qemu to not being at risk to flood real networks.

Issue #2857
This commit is contained in:
Martin Stein 2018-06-08 17:44:19 +02:00 committed by Norman Feske
parent e3fd554026
commit 14357b0b44
14 changed files with 1465 additions and 0 deletions
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197
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#
# Build
#
if {![have_include power_on/qemu] ||
[have_spec foc] || [have_spec odroid_xu] ||
[expr [have_spec imx53] && [have_spec trustzone]]} {
puts "Run script is not supported on this platform."
exit 0
}
set build_components {
core
init
drivers/timer
drivers/nic
server/nic_router
test/net_flood
app/ping
}
proc gpio_drv { } { if {[have_spec rpi] && [have_spec hw]} { return hw_gpio_drv }
if {[have_spec rpi] && [have_spec foc]} { return foc_gpio_drv }
return gpio_drv }
proc good_dst_ip { } { return "10.0.2.2" }
proc bad_dst_ip { } { return "10.0.0.123" }
lappend_if [have_spec gpio] build_components drivers/gpio
source ${genode_dir}/repos/base/run/platform_drv.inc
append_platform_drv_build_components
build $build_components
create_boot_directory
#
# Generate config
#
append config {
<config>
<parent-provides>
<service name="ROM"/>
<service name="IRQ"/>
<service name="IO_MEM"/>
<service name="IO_PORT"/>
<service name="PD"/>
<service name="RM"/>
<service name="CPU"/>
<service name="LOG"/>
</parent-provides>
<default-route>
<any-service> <parent/> <any-child/> </any-service>
</default-route>
<default caps="100"/>}
append_platform_drv_config
append_if [have_spec gpio] config "
<start name=\"[gpio_drv]\" caps=\"150\">
<resource name=\"RAM\" quantum=\"4M\"/>
<provides><service name=\"Gpio\"/></provides>
<config/>
</start>"
append config {
<start name="timer">
<resource name="RAM" quantum="1M"/>
<provides><service name="Timer"/></provides>
</start>
<start name="nic_drv" caps="150">
<binary name="} [nic_drv_binary] {"/>
<resource name="RAM" quantum="20M"/>
<provides><service name="Nic"/></provides>
} [nic_drv_config] {
</start>
<start name="nic_router" caps="200">
<resource name="RAM" quantum="10M"/>
<provides><service name="Nic"/></provides>
<config verbose="no"
verbose_packets="no"
verbose_domain_state="yes"
dhcp_discover_timeout_sec="1"
tcp_idle_timeout_sec="3600"
udp_idle_timeout_sec="3600"
icmp_idle_timeout_sec="3600">
<policy label_prefix="flood_links" domain="flood_links"/>
<policy label_prefix="ping" domain="flood_links"/>
<domain name="uplink" verbose_packets="no">
<nat domain="flood_links" udp-ports="16384"
tcp-ports="16384"
icmp-ids="16384"/>
</domain>
<domain name="flood_links" interface="10.0.1.1/24">
<dhcp-server ip_first="10.0.1.100"
ip_last="10.0.1.200"/>
<icmp dst="0.0.0.0/0" domain="uplink"/>
<udp dst="0.0.0.0/0"><permit-any domain="uplink"/></udp>
<tcp dst="0.0.0.0/0"><permit-any domain="uplink"/></tcp>
</domain>
</config>
<route>
<service name="Nic"> <child name="nic_drv"/> </service>
<any-service> <parent/> <any-child/> </any-service>
</route>
</start>
<start name="flood_links_tcp">
<binary name="test-net_flood"/>
<resource name="RAM" quantum="8M"/>
<config dst_ip="} [bad_dst_ip] {"
protocol="tcp"
verbose="no"/>
<route>
<service name="Nic"> <child name="nic_router"/> </service>
<any-service> <parent/> <any-child/> </any-service>
</route>
</start>
<start name="flood_links_udp">
<binary name="test-net_flood"/>
<resource name="RAM" quantum="8M"/>
<config dst_ip="} [bad_dst_ip] {"
protocol="udp"
verbose="no"/>
<route>
<service name="Nic"> <child name="nic_router"/> </service>
<any-service> <parent/> <any-child/> </any-service>
</route>
</start>
<start name="flood_links_icmp">
<binary name="test-net_flood"/>
<resource name="RAM" quantum="8M"/>
<config dst_ip="} [bad_dst_ip] {"
protocol="icmp"
verbose="no"/>
<route>
<service name="Nic"> <child name="nic_router"/> </service>
<any-service> <parent/> <any-child/> </any-service>
</route>
</start>
<start name="ping">
<resource name="RAM" quantum="8M"/>
<config dst_ip="} [good_dst_ip] {"
period_sec="2"
count="20"/>
<route>
<service name="Nic"> <child name="nic_router"/> </service>
<any-service> <parent/> <any-child/> </any-service>
</route>
</start>
</config>}
install_config $config
#
# Boot modules
#
# generic modules
append boot_modules {
core init
timer
} [nic_drv_binary] {
test-net_flood
ld.lib.so
nic_router
ping
}
# platform-specific modules
lappend_if [have_spec linux] boot_modules fb_sdl
lappend_if [have_spec gpio] boot_modules [gpio_drv]
append_platform_drv_boot_modules
build_boot_image $boot_modules
append_if [have_spec x86] qemu_args " -net nic,model=e1000 "
append_if [have_spec lan9118] qemu_args " -net nic,model=lan9118 "
append qemu_args " -net user -nographic "
run_genode_until ".*\"ping\" exited with exit value 0.*\n" 60

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<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="Boolean">
<xs:restriction base="xs:string">
<xs:enumeration value="true" />
<xs:enumeration value="yes" />
<xs:enumeration value="on" />
<xs:enumeration value="false" />
<xs:enumeration value="no" />
<xs:enumeration value="off" />
</xs:restriction>
</xs:simpleType><!-- Boolean -->
<xs:simpleType name="Protocol">
<xs:restriction base="xs:string">
<xs:enumeration value="icmp" />
<xs:enumeration value="udp" />
<xs:enumeration value="tcp" />
</xs:restriction>
</xs:simpleType><!-- Protocol -->
<xs:simpleType name="Ipv4_address">
<xs:restriction base="xs:string">
<xs:pattern value="[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}"/>
</xs:restriction>
</xs:simpleType><!-- Ipv4_address -->
<xs:simpleType name="Ipv4_address_prefix">
<xs:restriction base="xs:string">
<xs:pattern value="[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}/[0-9]{1,2}"/>
</xs:restriction>
</xs:simpleType><!-- Ipv4_address_prefix -->
<xs:element name="config">
<xs:complexType>
<xs:attribute name="verbose" type="Boolean" />
<xs:attribute name="dst_ip" type="Ipv4_address" />
<xs:attribute name="protocol" type="Protocol" />
<xs:attribute name="interface" type="Ipv4_address_prefix" />
<xs:attribute name="gateway" type="Ipv4_address" />
</xs:complexType>
</xs:element><!-- config -->
</xs:schema>

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/*
* \brief DHCP client state model
* \author Martin Stein
* \date 2016-08-24
*/
/*
* Copyright (C) 2016-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* local includes */
#include <nic.h>
#include <dhcp_client.h>
#include <ipv4_config.h>
/* Genode includes */
#include <util/xml_node.h>
enum { PKT_SIZE = 1024 };
struct Send_buffer_too_small : Genode::Exception { };
struct Bad_send_dhcp_args : Genode::Exception { };
using namespace Genode;
using namespace Net;
using Message_type = Dhcp_packet::Message_type;
using Dhcp_options = Dhcp_packet::Options_aggregator<Size_guard>;
/***************
** Utilities **
***************/
void append_param_req_list(Dhcp_options &dhcp_opts)
{
dhcp_opts.append_param_req_list([&] (Dhcp_options::Parameter_request_list_data &data) {
data.append_param_req<Dhcp_packet::Message_type_option>();
data.append_param_req<Dhcp_packet::Server_ipv4>();
data.append_param_req<Dhcp_packet::Ip_lease_time>();
data.append_param_req<Dhcp_packet::Dns_server_ipv4>();
data.append_param_req<Dhcp_packet::Subnet_mask>();
data.append_param_req<Dhcp_packet::Router_ipv4>();
});
}
/*****************
** Dhcp_client **
*****************/
Dhcp_client::Dhcp_client(Genode::Allocator &alloc,
Timer::Connection &timer,
Nic &nic,
Dhcp_client_handler &handler)
:
_alloc (alloc),
_timeout (timer, *this, &Dhcp_client::_handle_timeout),
_nic (nic),
_handler (handler)
{
_discover();
}
void Dhcp_client::_discover()
{
_set_state(State::SELECT, _discover_timeout);
_send(Message_type::DISCOVER, Ipv4_address(), Ipv4_address(),
Ipv4_address());
}
void Dhcp_client::_rerequest(State next_state)
{
_set_state(next_state, _rerequest_timeout(2));
Ipv4_address const client_ip = _handler.ip_config().interface.address;
_send(Message_type::REQUEST, client_ip, Ipv4_address(), client_ip);
}
void Dhcp_client::_set_state(State state, Microseconds timeout)
{
_state = state;
_timeout.schedule(timeout);
}
Microseconds Dhcp_client::_rerequest_timeout(unsigned lease_time_div_log2)
{
/* FIXME limit the time because of shortcomings in timeout framework */
enum { MAX_TIMEOUT_SEC = 3600 };
unsigned long timeout_sec = _lease_time_sec >> lease_time_div_log2;
if (timeout_sec > MAX_TIMEOUT_SEC) {
timeout_sec = MAX_TIMEOUT_SEC;
warning("Had to prune the state timeout of DHCP client");
}
return Microseconds(timeout_sec * 1000UL * 1000UL);
}
void Dhcp_client::_handle_timeout(Duration)
{
switch (_state) {
case State::BOUND: _rerequest(State::RENEW); break;
case State::RENEW: _rerequest(State::REBIND); break;
default: _discover();
}
}
void Dhcp_client::handle_eth(Ethernet_frame &eth, Size_guard &size_guard)
{
if (eth.dst() != _nic.mac() &&
eth.dst() != Mac_address(0xff))
{
throw Drop_packet_inform("DHCP client expects Ethernet targeting the router");
}
Ipv4_packet &ip = eth.data<Ipv4_packet>(size_guard);
if (ip.protocol() != Ipv4_packet::Protocol::UDP) {
throw Drop_packet_inform("DHCP client expects UDP packet"); }
Udp_packet &udp = ip.data<Udp_packet>(size_guard);
if (!Dhcp_packet::is_dhcp(&udp)) {
throw Drop_packet_inform("DHCP client expects DHCP packet"); }
Dhcp_packet &dhcp = udp.data<Dhcp_packet>(size_guard);
if (dhcp.op() != Dhcp_packet::REPLY) {
throw Drop_packet_inform("DHCP client expects DHCP reply"); }
if (dhcp.client_mac() != _nic.mac()) {
throw Drop_packet_inform("DHCP client expects DHCP targeting the router"); }
try { _handle_dhcp_reply(dhcp); }
catch (Dhcp_packet::Option_not_found) {
throw Drop_packet_inform("DHCP client misses DHCP option"); }
}
void Dhcp_client::_handle_dhcp_reply(Dhcp_packet &dhcp)
{
Message_type const msg_type =
dhcp.option<Dhcp_packet::Message_type_option>().value();
switch (_state) {
case State::SELECT:
if (msg_type != Message_type::OFFER) {
throw Drop_packet_inform("DHCP client expects an offer");
}
_set_state(State::REQUEST, _request_timeout);
_send(Message_type::REQUEST, Ipv4_address(),
dhcp.option<Dhcp_packet::Server_ipv4>().value(),
dhcp.yiaddr());
break;
case State::REQUEST:
{
if (msg_type != Message_type::ACK) {
throw Drop_packet_inform("DHCP client expects an acknowledgement");
}
_lease_time_sec = dhcp.option<Dhcp_packet::Ip_lease_time>().value();
_set_state(State::BOUND, _rerequest_timeout(1));
Ipv4_address dns_server;
try { dns_server = dhcp.option<Dhcp_packet::Dns_server_ipv4>().value(); }
catch (Dhcp_packet::Option_not_found) { }
Ipv4_config ip_config(
Ipv4_address_prefix(
dhcp.yiaddr(),
dhcp.option<Dhcp_packet::Subnet_mask>().value()),
dhcp.option<Dhcp_packet::Router_ipv4>().value(),
dns_server);
_handler.ip_config(ip_config);
break;
}
case State::RENEW:
case State::REBIND:
if (msg_type != Message_type::ACK) {
throw Drop_packet_inform("DHCP client expects an acknowledgement");
}
_set_state(State::BOUND, _rerequest_timeout(1));
_lease_time_sec = dhcp.option<Dhcp_packet::Ip_lease_time>().value();
break;
default: throw Drop_packet_inform("DHCP client doesn't expect a packet");
}
}
void Dhcp_client::_send(Message_type msg_type,
Ipv4_address client_ip,
Ipv4_address server_ip,
Ipv4_address requested_ip)
{
_nic.send(PKT_SIZE, [&] (void *pkt_base, Size_guard &size_guard) {
/* create ETH header of the request */
Ethernet_frame &eth = Ethernet_frame::construct_at(pkt_base, size_guard);
eth.dst(Mac_address(0xff));
eth.src(_nic.mac());
eth.type(Ethernet_frame::Type::IPV4);
/* create IP header of the request */
enum { IPV4_TIME_TO_LIVE = 64 };
size_t const ip_off = size_guard.head_size();
Ipv4_packet &ip = eth.construct_at_data<Ipv4_packet>(size_guard);
ip.header_length(sizeof(Ipv4_packet) / 4);
ip.version(4);
ip.time_to_live(IPV4_TIME_TO_LIVE);
ip.protocol(Ipv4_packet::Protocol::UDP);
ip.src(client_ip);
ip.dst(Ipv4_address(0xff));
/* create UDP header of the request */
size_t const udp_off = size_guard.head_size();
Udp_packet &udp = ip.construct_at_data<Udp_packet>(size_guard);
udp.src_port(Port(Dhcp_packet::BOOTPC));
udp.dst_port(Port(Dhcp_packet::BOOTPS));
/* create mandatory DHCP fields of the request */
size_t const dhcp_off = size_guard.head_size();
Dhcp_packet &dhcp = udp.construct_at_data<Dhcp_packet>(size_guard);
dhcp.op(Dhcp_packet::REQUEST);
dhcp.htype(Dhcp_packet::Htype::ETH);
dhcp.hlen(sizeof(Mac_address));
dhcp.ciaddr(client_ip);
dhcp.client_mac(_nic.mac());
dhcp.default_magic_cookie();
/* append DHCP option fields to the request */
Dhcp_options dhcp_opts(dhcp, size_guard);
dhcp_opts.append_option<Dhcp_packet::Message_type_option>(msg_type);
switch (msg_type) {
case Message_type::DISCOVER:
append_param_req_list(dhcp_opts);
dhcp_opts.append_option<Dhcp_packet::Client_id>(_nic.mac());
dhcp_opts.append_option<Dhcp_packet::Max_msg_size>(PKT_SIZE - dhcp_off);
break;
case Message_type::REQUEST:
append_param_req_list(dhcp_opts);
dhcp_opts.append_option<Dhcp_packet::Client_id>(_nic.mac());
dhcp_opts.append_option<Dhcp_packet::Max_msg_size>(PKT_SIZE - dhcp_off);
if (_state == State::REQUEST) {
dhcp_opts.append_option<Dhcp_packet::Requested_addr>(requested_ip);
dhcp_opts.append_option<Dhcp_packet::Server_ipv4>(server_ip);
}
break;
default:
throw Bad_send_dhcp_args();
}
dhcp_opts.append_option<Dhcp_packet::Options_end>();
/* fill in header values that need the packet to be complete already */
udp.length(size_guard.head_size() - udp_off);
udp.update_checksum(ip.src(), ip.dst());
ip.total_length(size_guard.head_size() - ip_off);
ip.update_checksum();
});
}

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/*
* \brief DHCP client state model
* \author Martin Stein
* \date 2016-08-24
*/
/*
* Copyright (C) 2016-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _DHCP_CLIENT_H_
#define _DHCP_CLIENT_H_
/* Genode includes */
#include <net/dhcp.h>
#include <timer_session/connection.h>
namespace Net {
/* external definition */
class Nic_peer;
class Ipv4_config;
class Ethernet_frame;
/* local definition */
class Dhcp_client;
class Dhcp_client_handler;
class Drop_packet_inform;
}
struct Net::Drop_packet_inform : Genode::Exception
{
char const *msg;
Drop_packet_inform(char const *msg) : msg(msg) { }
};
class Net::Dhcp_client_handler
{
public:
virtual void ip_config(Ipv4_config const &ip_config) = 0;
virtual Ipv4_config const &ip_config() const = 0;
virtual ~Dhcp_client_handler() { }
};
class Net::Dhcp_client
{
private:
enum class State
{
INIT = 0, SELECT = 1, REQUEST = 2, BOUND = 3, RENEW = 4, REBIND = 5
};
enum { DISCOVER_TIMEOUT_SEC = 2 };
enum { REQUEST_TIMEOUT_SEC = 2 };
Genode::Allocator &_alloc;
State _state { State::INIT };
Timer::One_shot_timeout<Dhcp_client> _timeout;
unsigned long _lease_time_sec = 0;
Genode::Microseconds const _discover_timeout { DISCOVER_TIMEOUT_SEC * 1000 * 1000 };
Genode::Microseconds const _request_timeout { REQUEST_TIMEOUT_SEC * 1000 * 1000 };
Nic &_nic;
Dhcp_client_handler &_handler;
void _handle_dhcp_reply(Dhcp_packet &dhcp);
void _handle_timeout(Genode::Duration);
void _rerequest(State next_state);
Genode::Microseconds _rerequest_timeout(unsigned lease_time_div_log2);
void _set_state(State state, Genode::Microseconds timeout);
void _send(Dhcp_packet::Message_type msg_type,
Ipv4_address client_ip,
Ipv4_address server_ip,
Ipv4_address requested_ip);
void _discover();
public:
Dhcp_client(Genode::Allocator &alloc,
Timer::Connection &timer,
Nic &nic,
Dhcp_client_handler &handler);
void handle_eth(Ethernet_frame &eth,
Size_guard &size_guard);
};
#endif /* _DHCP_CLIENT_H_ */

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/*
* \brief Ipv4 address combined with a subnet prefix length
* \author Martin Stein
* \date 2017-10-12
*/
/*
* Copyright (C) 2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* local includes */
#include <ipv4_address_prefix.h>
using namespace Genode;
using namespace Net;
Ipv4_address Ipv4_address_prefix::subnet_mask() const
{
Ipv4_address result;
if (prefix >= 8) {
result.addr[0] = 0xff;
if (prefix >= 16) {
result.addr[1] = 0xff;
if (prefix >= 24) {
result.addr[2] = 0xff;
result.addr[3] = 0xff << (32 - prefix);
} else {
result.addr[2] = 0xff << (24 - prefix);
}
} else {
result.addr[1] = 0xff << (16 - prefix);
}
} else {
result.addr[0] = 0xff << (8 - prefix);
}
return result;
}
void Ipv4_address_prefix::print(Genode::Output &output) const
{
Genode::print(output, address, "/", prefix);
}
bool Ipv4_address_prefix::prefix_matches(Ipv4_address const &ip) const
{
uint8_t prefix_left = prefix;
uint8_t byte = 0;
for (; prefix_left >= 8; prefix_left -= 8, byte++) {
if (ip.addr[byte] != address.addr[byte]) {
return false; }
}
if (prefix_left == 0) {
return true; }
uint8_t const mask = ~(0xff >> prefix_left);
return !((ip.addr[byte] ^ address.addr[byte]) & mask);
}
Ipv4_address Ipv4_address_prefix::broadcast_address() const
{
Ipv4_address result = address;
Ipv4_address const mask = subnet_mask();
for (unsigned i = 0; i < 4; i++) {
result.addr[i] |= ~mask.addr[i];
}
return result;
}
Ipv4_address_prefix::Ipv4_address_prefix(Ipv4_address address,
Ipv4_address subnet_mask)
:
address(address), prefix(0)
{
Genode::uint8_t rest;
if (subnet_mask.addr[0] != 0xff) {
rest = subnet_mask.addr[0];
prefix = 0;
} else if (subnet_mask.addr[1] != 0xff) {
rest = subnet_mask.addr[1];
prefix = 8;
} else if (subnet_mask.addr[2] != 0xff) {
rest = subnet_mask.addr[2];
prefix = 16;
} else {
rest = subnet_mask.addr[3];
prefix = 24;
}
for (Genode::uint8_t mask = 1 << 7; rest & mask; mask >>= 1)
prefix++;
}

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/*
* \brief Ipv4 address combined with a subnet prefix length
* \author Martin Stein
* \date 2017-10-12
*/
/*
* Copyright (C) 2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _IPV4_ADDRESS_PREFIX_H_
#define _IPV4_ADDRESS_PREFIX_H_
/* Genode includes */
#include <net/ipv4.h>
namespace Net { class Ipv4_address_prefix; }
struct Net::Ipv4_address_prefix
{
Ipv4_address address { };
Genode::uint8_t prefix;
Ipv4_address_prefix(Ipv4_address address,
Ipv4_address subnet_mask);
Ipv4_address_prefix() : prefix(32) { }
bool valid() const { return address.valid() || prefix == 0; }
void print(Genode::Output &output) const;
bool prefix_matches(Ipv4_address const &ip) const;
Ipv4_address subnet_mask() const;
Ipv4_address broadcast_address() const;
bool operator != (Ipv4_address_prefix const &other) const
{
return prefix != other.prefix ||
address != other.address;
}
};
namespace Genode {
inline size_t ascii_to(char const *s, Net::Ipv4_address_prefix &result);
}
Genode::size_t Genode::ascii_to(char const *s, Net::Ipv4_address_prefix &result)
{
/* read the leading IPv4 address, fail if there's no address */
Net::Ipv4_address_prefix buf;
size_t read_len = ascii_to(s, buf.address);
if (!read_len) {
return 0; }
/* check for the following slash */
s += read_len;
if (*s != '/') {
return 0; }
read_len++;
s++;
/* read the prefix, fail if there's no prefix */
size_t prefix_len = ascii_to_unsigned(s, buf.prefix, 10);
if (!prefix_len) {
return 0; }
/* fill result and return read length */
result = buf;
return read_len + prefix_len;
}
#endif /* _IPV4_ADDRESS_PREFIX_H_ */

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/*
* \brief IPv4 peer configuration
* \author Martin Stein
* \date 2016-08-19
*/
/*
* Copyright (C) 2016-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* Genode includes */
#include <base/log.h>
/* local includes */
#include <ipv4_config.h>
using namespace Genode;
using namespace Net;
Ipv4_config::Ipv4_config(Ipv4_address_prefix interface,
Ipv4_address gateway,
Ipv4_address dns_server)
:
interface(interface), gateway(gateway), dns_server(dns_server)
{
if (!valid && (interface_valid || gateway_valid)) {
error("Bad IP configuration");
}
}
void Ipv4_config::print(Genode::Output &output) const
{
Genode::print(output, "interface ", interface);
if (gateway.valid()) {
Genode::print(output, ", gateway ", gateway); }
if (dns_server.valid()) {
Genode::print(output, ", DNS server ", dns_server); }
}

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/*
* \brief IPv4 peer configuration
* \author Martin Stein
* \date 2016-08-19
*/
/*
* Copyright (C) 2016-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _IPV4_CONFIG_H_
#define _IPV4_CONFIG_H_
/* local includes */
#include <ipv4_address_prefix.h>
namespace Net { class Ipv4_config; }
struct Net::Ipv4_config
{
Ipv4_address_prefix const interface { };
bool const interface_valid { interface.valid() };
Ipv4_address const gateway { };
bool const gateway_valid { gateway.valid() };
Ipv4_address const dns_server { };
bool const valid { interface_valid &&
(!gateway_valid ||
interface.prefix_matches(gateway)) };
Ipv4_config(Ipv4_address_prefix interface,
Ipv4_address gateway,
Ipv4_address dns_server);
Ipv4_config() { }
bool operator != (Ipv4_config const &other) const
{
return interface != other.interface ||
gateway != other.gateway ||
dns_server != other.dns_server;
}
void print(Genode::Output &output) const;
};
#endif /* _IPV4_CONFIG_H_ */

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/*
* \brief Test the reachability of a host on an IP network
* \author Martin Stein
* \date 2018-03-27
*/
/*
* Copyright (C) 2018 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* local includes */
#include <nic.h>
#include <ipv4_config.h>
#include <dhcp_client.h>
#include <protocol.h>
/* Genode includes */
#include <net/ipv4.h>
#include <net/ethernet.h>
#include <net/arp.h>
#include <net/tcp.h>
#include <net/icmp.h>
#include <base/component.h>
#include <base/heap.h>
#include <base/attached_rom_dataspace.h>
#include <timer_session/connection.h>
using namespace Net;
using namespace Genode;
class Main : public Nic_handler,
public Dhcp_client_handler
{
private:
using Periodic_timeout = Timer::Periodic_timeout<Main>;
enum { IPV4_TIME_TO_LIVE = 64 };
enum { ICMP_DATA_SIZE = 56 };
enum { ICMP_SEQ = 1 };
enum { SRC_PORT = 50000 };
enum { FIRST_DST_PORT = 49152 };
enum { LAST_DST_PORT = 65535 };
Env &_env;
Attached_rom_dataspace _config_rom { _env, "config" };
Xml_node _config { _config_rom.xml() };
Timer::Connection _timer { _env };
Microseconds _period_us { 100 };
Constructible<Periodic_timeout> _period { };
Heap _heap { &_env.ram(), &_env.rm() };
bool const _verbose { _config.attribute_value("verbose", false) };
Net::Nic _nic { _env, _heap, *this, _verbose };
Ipv4_address const _dst_ip { _config.attribute_value("dst_ip", Ipv4_address()) };
Mac_address _dst_mac { };
Constructible<Dhcp_client> _dhcp_client { };
Reconstructible<Ipv4_config> _ip_config { _config.attribute_value("interface", Ipv4_address_prefix()),
_config.attribute_value("gateway", Ipv4_address()),
Ipv4_address() };
Protocol const _protocol { _config.attribute_value("protocol", Protocol::ICMP) };
Port _dst_port { FIRST_DST_PORT };
void _handle_arp(Ethernet_frame &eth,
Size_guard &size_guard);
void _broadcast_arp_request(Ipv4_address const &ip);
void _send_arp_reply(Ethernet_frame &req_eth,
Arp_packet &req_arp);
void _send_ping(Duration not_used = Duration(Microseconds(0)));
public:
struct Invalid_arguments : Exception { };
Main(Env &env);
/*****************
** Nic_handler **
*****************/
void handle_eth(Ethernet_frame &eth,
Size_guard &size_guard) override;
/*************************
** Dhcp_client_handler **
*************************/
void ip_config(Ipv4_config const &ip_config) override;
Ipv4_config const &ip_config() const override { return *_ip_config; }
};
void Main::ip_config(Ipv4_config const &ip_config)
{
if (_verbose) {
log("IP config: ", ip_config); }
_ip_config.construct(ip_config);
_period.construct(_timer, *this, &Main::_send_ping, _period_us);
}
Main::Main(Env &env) : _env(env)
{
/* exit unsuccessful if parameters are invalid */
if (_dst_ip == Ipv4_address()) {
throw Invalid_arguments(); }
/* if there is a static IP config, start sending pings periodically */
if (ip_config().valid) {
_period.construct(_timer, *this, &Main::_send_ping, _period_us); }
/* else, start the DHCP client for requesting an IP config */
else {
_dhcp_client.construct(_heap, _timer, _nic, *this); }
}
void Main::handle_eth(Ethernet_frame &eth,
Size_guard &size_guard)
{
try {
/* print receipt message */
if (_verbose) {
log("rcv ", eth); }
if (!ip_config().valid) {
_dhcp_client->handle_eth(eth, size_guard); }
/* drop packet if ETH does not target us */
if (eth.dst() != _nic.mac() &&
eth.dst() != Ethernet_frame::broadcast())
{
if (_verbose) {
log("bad ETH destination"); }
return;
}
/* select ETH sub-protocol */
switch (eth.type()) {
case Ethernet_frame::Type::ARP: _handle_arp(eth, size_guard); break;
default: ; }
}
catch (Drop_packet_inform exception) {
if (_verbose) {
log("drop packet: ", exception.msg); }
}
}
void Main::_handle_arp(Ethernet_frame &eth,
Size_guard &size_guard)
{
/* check ARP protocol- and hardware address type */
Arp_packet &arp = eth.data<Arp_packet>(size_guard);
if (!arp.ethernet_ipv4()) {
error("ARP for unknown protocol"); }
/* check ARP operation */
switch (arp.opcode()) {
case Arp_packet::REPLY:
/* check whether we waited for this ARP reply */
if (_dst_mac != Mac_address()) {
return; }
if (ip_config().interface.prefix_matches(_dst_ip)) {
if (arp.src_ip() != _dst_ip) {
return; }
} else {
if (arp.src_ip() != ip_config().gateway) {
return; }
}
/* set destination MAC address and retry to ping */
_dst_mac = arp.src_mac();
return;
case Arp_packet::REQUEST:
/* check whether the ARP request targets us */
if (arp.dst_ip() != ip_config().interface.address) {
return; }
_send_arp_reply(eth, arp);
default: ; }
}
void Main::_send_arp_reply(Ethernet_frame &req_eth,
Arp_packet &req_arp)
{
_nic.send(sizeof(Ethernet_frame) + sizeof(Arp_packet),
[&] (void *pkt_base, Size_guard &size_guard)
{
/* write Ethernet header */
Ethernet_frame &eth = Ethernet_frame::construct_at(pkt_base, size_guard);
eth.dst(req_eth.src());
eth.src(_nic.mac());
eth.type(Ethernet_frame::Type::ARP);
/* write ARP header */
Arp_packet &arp = eth.construct_at_data<Arp_packet>(size_guard);
arp.hardware_address_type(Arp_packet::ETHERNET);
arp.protocol_address_type(Arp_packet::IPV4);
arp.hardware_address_size(sizeof(Mac_address));
arp.protocol_address_size(sizeof(Ipv4_address));
arp.opcode(Arp_packet::REPLY);
arp.src_mac(_nic.mac());
arp.src_ip(ip_config().interface.address);
arp.dst_mac(req_eth.src());
arp.dst_ip(req_arp.src_ip());
});
}
void Main::_broadcast_arp_request(Ipv4_address const &dst_ip)
{
_nic.send(sizeof(Ethernet_frame) + sizeof(Arp_packet),
[&] (void *pkt_base, Size_guard &size_guard)
{
/* write Ethernet header */
Ethernet_frame &eth = Ethernet_frame::construct_at(pkt_base, size_guard);
eth.dst(Mac_address(0xff));
eth.src(_nic.mac());
eth.type(Ethernet_frame::Type::ARP);
/* write ARP header */
Arp_packet &arp = eth.construct_at_data<Arp_packet>(size_guard);
arp.hardware_address_type(Arp_packet::ETHERNET);
arp.protocol_address_type(Arp_packet::IPV4);
arp.hardware_address_size(sizeof(Mac_address));
arp.protocol_address_size(sizeof(Ipv4_address));
arp.opcode(Arp_packet::REQUEST);
arp.src_mac(_nic.mac());
arp.src_ip(ip_config().interface.address);
arp.dst_mac(Mac_address(0xff));
arp.dst_ip(dst_ip);
});
}
void Main::_send_ping(Duration)
{
/* if we do not yet know the Ethernet destination, request it via ARP */
if (_dst_mac == Mac_address()) {
if (ip_config().interface.prefix_matches(_dst_ip)) {
_broadcast_arp_request(_dst_ip); }
else {
_broadcast_arp_request(ip_config().gateway); }
return;
}
_nic.send(sizeof(Ethernet_frame) + sizeof(Ipv4_packet) +
sizeof(Icmp_packet) + ICMP_DATA_SIZE,
[&] (void *pkt_base, Size_guard &size_guard)
{
/* create ETH header */
Ethernet_frame &eth = Ethernet_frame::construct_at(pkt_base, size_guard);
eth.dst(_dst_mac);
eth.src(_nic.mac());
eth.type(Ethernet_frame::Type::IPV4);
/* create IP header */
size_t const ip_off = size_guard.head_size();
Ipv4_packet &ip = eth.construct_at_data<Ipv4_packet>(size_guard);
ip.header_length(sizeof(Ipv4_packet) / 4);
ip.version(4);
ip.time_to_live(IPV4_TIME_TO_LIVE);
ip.src(ip_config().interface.address);
ip.dst(_dst_ip);
/* select IP-encapsulated protocol */
switch (_protocol) {
case Protocol::ICMP:
{
/* adapt IP header to ICMP */
ip.protocol(Ipv4_packet::Protocol::ICMP);
/* create ICMP header */
Icmp_packet &icmp = ip.construct_at_data<Icmp_packet>(size_guard);
icmp.type(Icmp_packet::Type::ECHO_REQUEST);
icmp.code(Icmp_packet::Code::ECHO_REQUEST);
icmp.query_id(_dst_port.value);
icmp.query_seq(ICMP_SEQ);
/* finish ICMP header */
icmp.update_checksum(ICMP_DATA_SIZE);
/* prepare next ICMP ping */
if (_dst_port.value == LAST_DST_PORT) {
_dst_port.value = FIRST_DST_PORT; }
else {
_dst_port.value++; }
break;
}
case Protocol::UDP:
{
/* adapt IP header to UDP */
ip.protocol(Ipv4_packet::Protocol::UDP);
/* create UDP header */
size_t const udp_off = size_guard.head_size();
Udp_packet &udp = ip.construct_at_data<Udp_packet>(size_guard);
udp.src_port(Port(SRC_PORT));
udp.dst_port(_dst_port);
/* finish UDP header */
udp.length(size_guard.head_size() - udp_off);
udp.update_checksum(ip.src(), ip.dst());
/* prepare next ping */
if (_dst_port.value == LAST_DST_PORT) {
_dst_port.value = FIRST_DST_PORT; }
else {
_dst_port.value++; }
break;
}
case Protocol::TCP:
{
/* adapt IP header to TCP */
ip.protocol(Ipv4_packet::Protocol::TCP);
/* create TCP header */
size_t const tcp_off = size_guard.head_size();
Tcp_packet &tcp = ip.construct_at_data<Tcp_packet>(size_guard);
tcp.src_port(Port(SRC_PORT));
tcp.dst_port(_dst_port);
/* finish TCP header */
tcp.update_checksum(ip.src(), ip.dst(), size_guard.head_size() - tcp_off);
/* prepare next ping */
if (_dst_port.value == LAST_DST_PORT) {
_dst_port.value = FIRST_DST_PORT; }
else {
_dst_port.value++; }
break;
}
}
/* finish IP header */
ip.total_length(size_guard.head_size() - ip_off);
ip.update_checksum();
});
}
void Component::construct(Env &env) { static Main main(env); }

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/*
* \brief NIC connection wrapper for a more convenient interface
* \author Martin Stein
* \date 2018-04-16
*/
/*
* Copyright (C) 2018 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* local includes */
#include <nic.h>
using namespace Net;
using namespace Genode;
void Net::Nic::_ready_to_ack()
{
while (_source().ack_avail()) {
_source().release_packet(_source().get_acked_packet()); }
}
void Net::Nic::_ready_to_submit()
{
while (_sink().packet_avail()) {
Packet_descriptor const pkt = _sink().get_packet();
if (!pkt.size()) {
continue; }
Size_guard size_guard(pkt.size());
_handler.handle_eth(Ethernet_frame::cast_from(_sink().packet_content(pkt), size_guard),
size_guard);
if (!_sink().ready_to_ack()) {
error("ack state FULL");
return;
}
_sink().acknowledge_packet(pkt);
}
}

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/*
* \brief NIC connection wrapper for a more convenient interface
* \author Martin Stein
* \date 2018-04-16
*/
/*
* Copyright (C) 2018 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _NIC_H_
#define _NIC_H_
/* Genode includes */
#include <nic_session/connection.h>
#include <nic/packet_allocator.h>
#include <net/ethernet.h>
namespace Genode {
class Env;
}
namespace Net {
struct Nic_handler;
class Nic;
using Packet_descriptor = ::Nic::Packet_descriptor;
using Packet_stream_sink = ::Nic::Packet_stream_sink< ::Nic::Session::Policy>;
using Packet_stream_source = ::Nic::Packet_stream_source< ::Nic::Session::Policy>;
}
struct Net::Nic_handler
{
virtual void handle_eth(Ethernet_frame &eth,
Size_guard &size_guard) = 0;
virtual ~Nic_handler() { }
};
class Net::Nic
{
private:
using Signal_handler = Genode::Signal_handler<Nic>;
enum { PKT_SIZE = ::Nic::Packet_allocator::DEFAULT_PACKET_SIZE };
enum { BUF_SIZE = 90 * PKT_SIZE };
Genode::Env &_env;
Genode::Allocator &_alloc;
Nic_handler &_handler;
bool const &_verbose;
::Nic::Packet_allocator _pkt_alloc { &_alloc };
::Nic::Connection _nic { _env, &_pkt_alloc, BUF_SIZE, BUF_SIZE };
Signal_handler _sink_ack { _env.ep(), *this, &Nic::_ack_avail };
Signal_handler _sink_submit { _env.ep(), *this, &Nic::_ready_to_submit };
Signal_handler _source_ack { _env.ep(), *this, &Nic::_ready_to_ack };
Signal_handler _source_submit { _env.ep(), *this, &Nic::_packet_avail };
Mac_address const _mac { _nic.mac_address() };
Net::Packet_stream_sink &_sink() { return *_nic.rx(); }
Net::Packet_stream_source &_source() { return *_nic.tx(); }
/***********************************
** Packet-stream signal handlers **
***********************************/
void _ready_to_submit();
void _ack_avail() { }
void _ready_to_ack();
void _packet_avail() { }
public:
Nic(Genode::Env &env,
Genode::Allocator &alloc,
Nic_handler &handler,
bool const &verbose)
:
_env (env),
_alloc (alloc),
_handler (handler),
_verbose (verbose)
{
/* install packet stream signals */
_nic.rx_channel()->sigh_ready_to_ack(_sink_ack);
_nic.rx_channel()->sigh_packet_avail(_sink_submit);
_nic.tx_channel()->sigh_ack_avail(_source_ack);
_nic.tx_channel()->sigh_ready_to_submit(_source_submit);
}
template <typename FUNC>
void send(Genode::size_t pkt_size,
FUNC && write_to_pkt)
{
try {
Packet_descriptor pkt = _source().alloc_packet(pkt_size);
void *pkt_base = _source().packet_content(pkt);
Size_guard size_guard(pkt_size);
write_to_pkt(pkt_base, size_guard);
_source().submit_packet(pkt);
if (_verbose) {
Size_guard size_guard(pkt_size);
try { Genode::log("snd ", Ethernet_frame::cast_from(pkt_base, size_guard)); }
catch (Size_guard::Exceeded) { Genode::log("snd ?"); }
}
}
catch (Net::Packet_stream_source::Packet_alloc_failed) {
Genode::warning("failed to allocate packet"); }
}
/***************
** Accessors **
***************/
Mac_address const &mac() const { return _mac; }
};
#endif /* _NIC_H_ */

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/*
* \brief Supported protocols
* \author Martin Stein
* \date 2018-03-27
*/
/*
* Copyright (C) 2018 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef __PROTOCOL_H_
#define __PROTOCOL_H_
/* Genode includes */
#include <base/stdint.h>
namespace Genode { enum class Protocol : uint16_t { ICMP, UDP, TCP }; }
namespace Genode
{
inline size_t ascii_to(char const *s, Protocol &result)
{
if (!strcmp(s, "icmp", 4)) { result = Protocol::ICMP; return 4; }
if (!strcmp(s, "udp", 3)) { result = Protocol::UDP; return 3; }
if (!strcmp(s, "tcp", 3)) { result = Protocol::TCP; return 3; }
return 0;
}
}
#endif /* __PROTOCOL_H_ */

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TARGET = test-net_flood
LIBS += base net
SRC_CC += main.cc dhcp_client.cc ipv4_address_prefix.cc
SRC_CC += nic.cc ipv4_config.cc
INC_DIR += $(PRG_DIR)
CONFIG_XSD = config.xsd

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@ -53,6 +53,7 @@ nic_bridge
nic_dump
nic_loopback
nic_router
nic_router_flood
nic_router_uplinks
noux
noux_net_netcat