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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Singleton.h>
#include <AK/StringBuilder.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Net/ARP.h>
#include <Kernel/Net/ICMP.h>
#include <Kernel/Net/IPv4.h>
#include <Kernel/Net/IPv4Socket.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/Net/Routing.h>
#include <Kernel/Net/TCP.h>
#include <Kernel/Net/TCPSocket.h>
#include <Kernel/Net/UDP.h>
#include <Kernel/Net/UDPSocket.h>
#include <Kernel/Process.h>
#include <Kernel/UnixTypes.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
//#define IPV4_SOCKET_DEBUG
namespace Kernel {
static AK::Singleton<Lockable<HashTable<IPv4Socket*>>> s_table;
Lockable<HashTable<IPv4Socket*>>& IPv4Socket::all_sockets()
{
return *s_table;
}
KResultOr<NonnullRefPtr<Socket>> IPv4Socket::create(int type, int protocol)
{
if (type == SOCK_STREAM)
return TCPSocket::create(protocol);
if (type == SOCK_DGRAM)
return UDPSocket::create(protocol);
if (type == SOCK_RAW)
return adopt(*new IPv4Socket(type, protocol));
return KResult(-EINVAL);
}
IPv4Socket::IPv4Socket(int type, int protocol)
: Socket(AF_INET, type, protocol)
{
#ifdef IPV4_SOCKET_DEBUG
dbg() << "IPv4Socket{" << this << "} created with type=" << type << ", protocol=" << protocol;
#endif
m_buffer_mode = type == SOCK_STREAM ? BufferMode::Bytes : BufferMode::Packets;
if (m_buffer_mode == BufferMode::Bytes) {
m_scratch_buffer = KBuffer::create_with_size(65536);
}
LOCKER(all_sockets().lock());
all_sockets().resource().set(this);
}
IPv4Socket::~IPv4Socket()
{
LOCKER(all_sockets().lock());
all_sockets().resource().remove(this);
}
void IPv4Socket::get_local_address(sockaddr* address, socklen_t* address_size)
{
sockaddr_in local_address = { AF_INET, htons(m_local_port), { m_local_address.to_in_addr_t() }, { 0 } };
memcpy(address, &local_address, min(static_cast<size_t>(*address_size), sizeof(sockaddr_in)));
*address_size = sizeof(sockaddr_in);
}
void IPv4Socket::get_peer_address(sockaddr* address, socklen_t* address_size)
{
sockaddr_in peer_address = { AF_INET, htons(m_peer_port), { m_peer_address.to_in_addr_t() }, { 0 } };
memcpy(address, &peer_address, min(static_cast<size_t>(*address_size), sizeof(sockaddr_in)));
*address_size = sizeof(sockaddr_in);
}
KResult IPv4Socket::bind(Userspace<const sockaddr*> user_address, socklen_t address_size)
{
ASSERT(setup_state() == SetupState::Unstarted);
if (address_size != sizeof(sockaddr_in))
return KResult(-EINVAL);
sockaddr_in address;
if (!copy_from_user(&address, user_address, sizeof(sockaddr_in)))
return KResult(-EFAULT);
if (address.sin_family != AF_INET)
return KResult(-EINVAL);
auto requested_local_port = ntohs(address.sin_port);
if (!Process::current()->is_superuser()) {
if (requested_local_port < 1024) {
dbg() << "UID " << Process::current()->uid() << " attempted to bind " << class_name() << " to port " << requested_local_port;
return KResult(-EACCES);
}
}
m_local_address = IPv4Address((const u8*)&address.sin_addr.s_addr);
m_local_port = requested_local_port;
#ifdef IPV4_SOCKET_DEBUG
dbg() << "IPv4Socket::bind " << class_name() << "{" << this << "} to " << m_local_address << ":" << m_local_port;
#endif
return protocol_bind();
}
KResult IPv4Socket::listen(size_t backlog)
{
LOCKER(lock());
int rc = allocate_local_port_if_needed();
if (rc < 0)
return KResult(-EADDRINUSE);
set_backlog(backlog);
m_role = Role::Listener;
#ifdef IPV4_SOCKET_DEBUG
dbg() << "IPv4Socket{" << this << "} listening with backlog=" << backlog;
#endif
return protocol_listen();
}
KResult IPv4Socket::connect(FileDescription& description, Userspace<const sockaddr*> address, socklen_t address_size, ShouldBlock should_block)
{
if (address_size != sizeof(sockaddr_in))
return KResult(-EINVAL);
u16 sa_family_copy;
auto* user_address = reinterpret_cast<const sockaddr*>(address.unsafe_userspace_ptr());
if (!copy_from_user(&sa_family_copy, &user_address->sa_family, sizeof(u16)))
return KResult(-EFAULT);
if (sa_family_copy != AF_INET)
return KResult(-EINVAL);
if (m_role == Role::Connected)
return KResult(-EISCONN);
sockaddr_in safe_address;
if (!copy_from_user(&safe_address, (const sockaddr_in*)user_address, sizeof(sockaddr_in)))
return KResult(-EFAULT);
m_peer_address = IPv4Address((const u8*)&safe_address.sin_addr.s_addr);
m_peer_port = ntohs(safe_address.sin_port);
return protocol_connect(description, should_block);
}
void IPv4Socket::attach(FileDescription&)
{
}
void IPv4Socket::detach(FileDescription&)
{
}
bool IPv4Socket::can_read(const FileDescription&, size_t) const
{
if (m_role == Role::Listener)
return can_accept();
if (protocol_is_disconnected())
return true;
return m_can_read;
}
bool IPv4Socket::can_write(const FileDescription&, size_t) const
{
return is_connected();
}
int IPv4Socket::allocate_local_port_if_needed()
{
if (m_local_port)
return m_local_port;
int port = protocol_allocate_local_port();
if (port < 0)
return port;
m_local_port = (u16)port;
return port;
}
KResultOr<size_t> IPv4Socket::sendto(FileDescription&, const UserOrKernelBuffer& data, size_t data_length, int flags, Userspace<const sockaddr*> addr, socklen_t addr_length)
{
LOCKER(lock());
(void)flags;
if (addr && addr_length != sizeof(sockaddr_in))
return KResult(-EINVAL);
if (addr) {
sockaddr_in ia;
if (!copy_from_user(&ia, Userspace<const sockaddr_in*>(addr.ptr())))
return KResult(-EFAULT);
if (ia.sin_family != AF_INET) {
klog() << "sendto: Bad address family: " << ia.sin_family << " is not AF_INET!";
return KResult(-EAFNOSUPPORT);
}
m_peer_address = IPv4Address((const u8*)&ia.sin_addr.s_addr);
m_peer_port = ntohs(ia.sin_port);
}
auto routing_decision = route_to(m_peer_address, m_local_address, bound_interface());
if (routing_decision.is_zero())
return KResult(-EHOSTUNREACH);
if (m_local_address.to_u32() == 0)
m_local_address = routing_decision.adapter->ipv4_address();
int rc = allocate_local_port_if_needed();
if (rc < 0)
return rc;
#ifdef IPV4_SOCKET_DEBUG
klog() << "sendto: destination=" << m_peer_address.to_string().characters() << ":" << m_peer_port;
#endif
if (type() == SOCK_RAW) {
int err = routing_decision.adapter->send_ipv4(routing_decision.next_hop, m_peer_address, (IPv4Protocol)protocol(), data, data_length, m_ttl);
if (err < 0)
return KResult(err);
return data_length;
}
auto nsent_or_error = protocol_send(data, data_length);
if (!nsent_or_error.is_error())
Thread::current()->did_ipv4_socket_write(nsent_or_error.value());
return nsent_or_error;
}
KResultOr<size_t> IPv4Socket::receive_byte_buffered(FileDescription& description, UserOrKernelBuffer& buffer, size_t buffer_length, int, Userspace<sockaddr*>, Userspace<socklen_t*>)
{
Locker locker(lock());
if (m_receive_buffer.is_empty()) {
if (protocol_is_disconnected())
return 0;
if (!description.is_blocking())
return KResult(-EAGAIN);
locker.unlock();
auto res = Thread::current()->block<Thread::ReadBlocker>(nullptr, description);
locker.lock();
if (!m_can_read) {
if (res.was_interrupted())
return KResult(-EINTR);
// Unblocked due to timeout.
return KResult(-EAGAIN);
}
}
ASSERT(!m_receive_buffer.is_empty());
int nreceived = m_receive_buffer.read(buffer, buffer_length);
if (nreceived > 0)
Thread::current()->did_ipv4_socket_read((size_t)nreceived);
m_can_read = !m_receive_buffer.is_empty();
return nreceived;
}
KResultOr<size_t> IPv4Socket::receive_packet_buffered(FileDescription& description, UserOrKernelBuffer& buffer, size_t buffer_length, int flags, Userspace<sockaddr*> addr, Userspace<socklen_t*> addr_length, timeval& packet_timestamp)
{
Locker locker(lock());
ReceivedPacket packet;
{
if (m_receive_queue.is_empty()) {
// FIXME: Shouldn't this return -ENOTCONN instead of EOF?
// But if so, we still need to deliver at least one EOF read to userspace.. right?
if (protocol_is_disconnected())
return 0;
if (!description.is_blocking())
return KResult(-EAGAIN);
}
if (!m_receive_queue.is_empty()) {
packet = m_receive_queue.take_first();
m_can_read = !m_receive_queue.is_empty();
#ifdef IPV4_SOCKET_DEBUG
dbg() << "IPv4Socket(" << this << "): recvfrom without blocking " << packet.data.value().size() << " bytes, packets in queue: " << m_receive_queue.size();
#endif
}
}
if (!packet.data.has_value()) {
if (protocol_is_disconnected()) {
dbg() << "IPv4Socket{" << this << "} is protocol-disconnected, returning 0 in recvfrom!";
return 0;
}
locker.unlock();
auto res = Thread::current()->block<Thread::ReadBlocker>(nullptr, description);
locker.lock();
if (!m_can_read) {
if (res.was_interrupted())
return KResult(-EINTR);
// Unblocked due to timeout.
return KResult(-EAGAIN);
}
ASSERT(m_can_read);
ASSERT(!m_receive_queue.is_empty());
packet = m_receive_queue.take_first();
m_can_read = !m_receive_queue.is_empty();
#ifdef IPV4_SOCKET_DEBUG
dbg() << "IPv4Socket(" << this << "): recvfrom with blocking " << packet.data.value().size() << " bytes, packets in queue: " << m_receive_queue.size();
#endif
}
ASSERT(packet.data.has_value());
packet_timestamp = packet.timestamp;
if (addr) {
#ifdef IPV4_SOCKET_DEBUG
dbg() << "Incoming packet is from: " << packet.peer_address << ":" << packet.peer_port;
#endif
sockaddr_in out_addr {};
memcpy(&out_addr.sin_addr, &packet.peer_address, sizeof(IPv4Address));
out_addr.sin_port = htons(packet.peer_port);
out_addr.sin_family = AF_INET;
Userspace<sockaddr_in*> dest_addr = addr.ptr();
if (!copy_to_user(dest_addr, &out_addr))
return KResult(-EFAULT);
socklen_t out_length = sizeof(sockaddr_in);
ASSERT(addr_length);
if (!copy_to_user(addr_length, &out_length))
return KResult(-EFAULT);
}
if (type() == SOCK_RAW) {
size_t bytes_written = min(packet.data.value().size(), buffer_length);
if (!buffer.write(packet.data.value().data(), bytes_written))
return KResult(-EFAULT);
return bytes_written;
}
return protocol_receive(packet.data.value(), buffer, buffer_length, flags);
}
KResultOr<size_t> IPv4Socket::recvfrom(FileDescription& description, UserOrKernelBuffer& buffer, size_t buffer_length, int flags, Userspace<sockaddr*> user_addr, Userspace<socklen_t*> user_addr_length, timeval& packet_timestamp)
{
if (user_addr_length) {
socklen_t addr_length;
if (!copy_from_user(&addr_length, user_addr_length.unsafe_userspace_ptr()))
return KResult(-EFAULT);
if (addr_length < sizeof(sockaddr_in))
return KResult(-EINVAL);
}
#ifdef IPV4_SOCKET_DEBUG
klog() << "recvfrom: type=" << type() << ", local_port=" << local_port();
#endif
KResultOr<size_t> nreceived = 0;
if (buffer_mode() == BufferMode::Bytes)
nreceived = receive_byte_buffered(description, buffer, buffer_length, flags, user_addr, user_addr_length);
else
nreceived = receive_packet_buffered(description, buffer, buffer_length, flags, user_addr, user_addr_length, packet_timestamp);
if (!nreceived.is_error())
Thread::current()->did_ipv4_socket_read(nreceived.value());
return nreceived;
}
bool IPv4Socket::did_receive(const IPv4Address& source_address, u16 source_port, KBuffer&& packet, const timeval& packet_timestamp)
{
LOCKER(lock());
if (is_shut_down_for_reading())
return false;
auto packet_size = packet.size();
if (buffer_mode() == BufferMode::Bytes) {
size_t space_in_receive_buffer = m_receive_buffer.space_for_writing();
if (packet_size > space_in_receive_buffer) {
dbg() << "IPv4Socket(" << this << "): did_receive refusing packet since buffer is full.";
ASSERT(m_can_read);
return false;
}
auto scratch_buffer = UserOrKernelBuffer::for_kernel_buffer(m_scratch_buffer.value().data());
auto nreceived_or_error = protocol_receive(packet, scratch_buffer, m_scratch_buffer.value().size(), 0);
if (nreceived_or_error.is_error())
return false;
ssize_t nwritten = m_receive_buffer.write(scratch_buffer, nreceived_or_error.value());
if (nwritten < 0)
return false;
m_can_read = !m_receive_buffer.is_empty();
} else {
if (m_receive_queue.size() > 2000) {
dbg() << "IPv4Socket(" << this << "): did_receive refusing packet since queue is full.";
return false;
}
m_receive_queue.append({ source_address, source_port, packet_timestamp, move(packet) });
m_can_read = true;
}
m_bytes_received += packet_size;
#ifdef IPV4_SOCKET_DEBUG
if (buffer_mode() == BufferMode::Bytes)
dbg() << "IPv4Socket(" << this << "): did_receive " << packet_size << " bytes, total_received=" << m_bytes_received;
else
dbg() << "IPv4Socket(" << this << "): did_receive " << packet_size << " bytes, total_received=" << m_bytes_received << ", packets in queue: " << m_receive_queue.size();
#endif
return true;
}
String IPv4Socket::absolute_path(const FileDescription&) const
{
if (m_role == Role::None)
return "socket";
StringBuilder builder;
builder.append("socket:");
builder.appendf("%s:%d", m_local_address.to_string().characters(), m_local_port);
if (m_role == Role::Accepted || m_role == Role::Connected)
builder.appendf(" / %s:%d", m_peer_address.to_string().characters(), m_peer_port);
switch (m_role) {
case Role::Listener:
builder.append(" (listening)");
break;
case Role::Accepted:
builder.append(" (accepted)");
break;
case Role::Connected:
builder.append(" (connected)");
break;
case Role::Connecting:
builder.append(" (connecting)");
break;
default:
ASSERT_NOT_REACHED();
}
return builder.to_string();
}
KResult IPv4Socket::setsockopt(int level, int option, Userspace<const void*> user_value, socklen_t user_value_size)
{
if (level != IPPROTO_IP)
return Socket::setsockopt(level, option, user_value, user_value_size);
switch (option) {
case IP_TTL: {
if (user_value_size < sizeof(int))
return KResult(-EINVAL);
int value;
if (!copy_from_user(&value, static_ptr_cast<const int*>(user_value)))
return KResult(-EFAULT);
if (value < 0 || value > 255)
return KResult(-EINVAL);
m_ttl = value;
return KSuccess;
}
default:
return KResult(-ENOPROTOOPT);
}
}
KResult IPv4Socket::getsockopt(FileDescription& description, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
{
if (level != IPPROTO_IP)
return Socket::getsockopt(description, level, option, value, value_size);
socklen_t size;
if (!copy_from_user(&size, value_size.unsafe_userspace_ptr()))
return KResult(-EFAULT);
switch (option) {
case IP_TTL:
if (size < sizeof(int))
return KResult(-EINVAL);
if (!copy_to_user(static_ptr_cast<int*>(value), (int*)&m_ttl))
return KResult(-EFAULT);
size = sizeof(int);
if (!copy_to_user(value_size, &size))
return KResult(-EFAULT);
return KSuccess;
default:
return KResult(-ENOPROTOOPT);
}
}
int IPv4Socket::ioctl(FileDescription&, unsigned request, FlatPtr arg)
{
REQUIRE_PROMISE(inet);
SmapDisabler disabler;
auto ioctl_route = [request, arg]() {
rtentry route;
if (!copy_from_user(&route, (rtentry*)arg))
return -EFAULT;
auto copied_ifname = copy_string_from_user(route.rt_dev, IFNAMSIZ);
if (copied_ifname.is_null())
return -EFAULT;
auto adapter = NetworkAdapter::lookup_by_name(copied_ifname);
if (!adapter)
return -ENODEV;
switch (request) {
case SIOCADDRT:
if (!Process::current()->is_superuser())
return -EPERM;
if (route.rt_gateway.sa_family != AF_INET)
return -EAFNOSUPPORT;
if ((route.rt_flags & (RTF_UP | RTF_GATEWAY)) != (RTF_UP | RTF_GATEWAY))
return -EINVAL; // FIXME: Find the correct value to return
adapter->set_ipv4_gateway(IPv4Address(((sockaddr_in&)route.rt_gateway).sin_addr.s_addr));
return 0;
case SIOCDELRT:
// FIXME: Support gateway deletion
return 0;
}
return -EINVAL;
};
auto ioctl_interface = [request, arg]() {
ifreq* user_ifr = (ifreq*)arg;
ifreq ifr;
if (!copy_from_user(&ifr, user_ifr))
return -EFAULT;
char namebuf[IFNAMSIZ + 1];
memcpy(namebuf, ifr.ifr_name, IFNAMSIZ);
namebuf[sizeof(namebuf) - 1] = '\0';
auto adapter = NetworkAdapter::lookup_by_name(namebuf);
if (!adapter)
return -ENODEV;
switch (request) {
case SIOCSIFADDR:
if (!Process::current()->is_superuser())
return -EPERM;
if (ifr.ifr_addr.sa_family != AF_INET)
return -EAFNOSUPPORT;
adapter->set_ipv4_address(IPv4Address(((sockaddr_in&)ifr.ifr_addr).sin_addr.s_addr));
return 0;
case SIOCSIFNETMASK:
if (!Process::current()->is_superuser())
return -EPERM;
if (ifr.ifr_addr.sa_family != AF_INET)
return -EAFNOSUPPORT;
adapter->set_ipv4_netmask(IPv4Address(((sockaddr_in&)ifr.ifr_netmask).sin_addr.s_addr));
return 0;
case SIOCGIFADDR: {
u16 sa_family = AF_INET;
if (!copy_to_user(&user_ifr->ifr_addr.sa_family, &sa_family))
return -EFAULT;
auto ip4_addr = adapter->ipv4_address().to_u32();
if (!copy_to_user(&((sockaddr_in&)user_ifr->ifr_addr).sin_addr.s_addr, &ip4_addr, sizeof(ip4_addr)))
return -EFAULT;
return 0;
}
case SIOCGIFHWADDR: {
u16 sa_family = AF_INET;
if (!copy_to_user(&user_ifr->ifr_hwaddr.sa_family, &sa_family))
return -EFAULT;
auto mac_address = adapter->mac_address();
if (!copy_to_user(ifr.ifr_hwaddr.sa_data, &mac_address, sizeof(MACAddress)))
return -EFAULT;
return 0;
}
}
return -EINVAL;
};
switch (request) {
case SIOCSIFADDR:
case SIOCSIFNETMASK:
case SIOCGIFADDR:
case SIOCGIFHWADDR:
return ioctl_interface();
case SIOCADDRT:
case SIOCDELRT:
return ioctl_route();
}
return -EINVAL;
}
KResult IPv4Socket::close()
{
(void)shutdown(SHUT_RDWR);
return KSuccess;
}
void IPv4Socket::shut_down_for_reading()
{
Socket::shut_down_for_reading();
m_can_read = true;
}
}
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