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Kernel: Add so_error to keep track of the socket's error state

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This sets the m_so_error variable every time the socket returns an
error.
This commit is contained in:
brapru 2021-08-01 11:27:23 -04:00 • committed by Andreas Kling
parent f424485193
commit 0095c7cb7d
6 changed files with 88 additions and 78 deletions
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55
Kernel/Net/LocalSocket.cpp
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@ -122,14 +122,14 @@ KResult LocalSocket::bind(Userspace<const sockaddr*> user_address, socklen_t add
{
VERIFY(setup_state() == SetupState::Unstarted);
if (address_size != sizeof(sockaddr_un))
return EINVAL;
return set_so_error(EINVAL);
sockaddr_un address;
if (!copy_from_user(&address, user_address, sizeof(sockaddr_un)))
return EFAULT;
return set_so_error(EFAULT);
if (address.sun_family != AF_LOCAL)
return EINVAL;
return set_so_error(EINVAL);
auto path = String(address.sun_path, strnlen(address.sun_path, sizeof(address.sun_path)));
@ -140,7 +140,7 @@ KResult LocalSocket::bind(Userspace<const sockaddr*> user_address, socklen_t add
auto result = VirtualFileSystem::the().open(path, O_CREAT | O_EXCL | O_NOFOLLOW_NOERROR, mode, Process::current()->current_directory(), owner);
if (result.is_error()) {
if (result.error() == -EEXIST)
return EADDRINUSE;
return set_so_error(EADDRINUSE);
return result.error();
}
@ -148,7 +148,7 @@ KResult LocalSocket::bind(Userspace<const sockaddr*> user_address, socklen_t add
VERIFY(file->inode());
if (!file->inode()->bind_socket(*this))
return EADDRINUSE;
return set_so_error(EADDRINUSE);
m_file = move(file);
@ -161,33 +161,33 @@ KResult LocalSocket::connect(FileDescription& description, Userspace<const socka
{
VERIFY(!m_bound);
if (address_size != sizeof(sockaddr_un))
return EINVAL;
return set_so_error(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 EFAULT;
return set_so_error(EFAULT);
if (sa_family_copy != AF_LOCAL)
return EINVAL;
return set_so_error(EINVAL);
if (is_connected())
return EISCONN;
return set_so_error(EISCONN);
const auto& local_address = *reinterpret_cast<const sockaddr_un*>(user_address);
char safe_address[sizeof(local_address.sun_path) + 1] = { 0 };
if (!copy_from_user(&safe_address[0], &local_address.sun_path[0], sizeof(safe_address) - 1))
return EFAULT;
return set_so_error(EFAULT);
safe_address[sizeof(safe_address) - 1] = '\0';
dbgln_if(LOCAL_SOCKET_DEBUG, "LocalSocket({}) connect({})", this, safe_address);
auto description_or_error = VirtualFileSystem::the().open(safe_address, O_RDWR, 0, Process::current()->current_directory());
if (description_or_error.is_error())
return ECONNREFUSED;
return set_so_error(ECONNREFUSED);
m_file = move(description_or_error.value());
VERIFY(m_file->inode());
if (!m_file->inode()->socket())
return ECONNREFUSED;
return set_so_error(ECONNREFUSED);
m_address.sun_family = sa_family_copy;
memcpy(m_address.sun_path, safe_address, sizeof(m_address.sun_path));
@ -210,14 +210,14 @@ KResult LocalSocket::connect(FileDescription& description, Userspace<const socka
auto unblock_flags = Thread::FileDescriptionBlocker::BlockFlags::None;
if (Thread::current()->block<Thread::ConnectBlocker>({}, description, unblock_flags).was_interrupted()) {
set_connect_side_role(Role::None);
return EINTR;
return set_so_error(EINTR);
}
dbgln_if(LOCAL_SOCKET_DEBUG, "LocalSocket({}) connect({}) status is {}", this, safe_address, to_string(setup_state()));
if (!has_flag(unblock_flags, Thread::FileDescriptionBlocker::BlockFlags::Connect)) {
set_connect_side_role(Role::None);
return ECONNREFUSED;
return set_so_error(ECONNREFUSED);
}
set_connect_side_role(Role::Connected);
return KSuccess;
@ -227,7 +227,7 @@ KResult LocalSocket::listen(size_t backlog)
{
MutexLocker locker(lock());
if (type() != SOCK_STREAM)
return EOPNOTSUPP;
return set_so_error(EOPNOTSUPP);
set_backlog(backlog);
auto previous_role = m_role;
m_role = Role::Listener;
@ -300,10 +300,10 @@ bool LocalSocket::can_write(const FileDescription& description, size_t) const
KResultOr<size_t> LocalSocket::sendto(FileDescription& description, const UserOrKernelBuffer& data, size_t data_size, int, Userspace<const sockaddr*>, socklen_t)
{
if (!has_attached_peer(description))
return EPIPE;
return set_so_error(EPIPE);
auto* socket_buffer = send_buffer_for(description);
if (!socket_buffer)
return EINVAL;
return set_so_error(EINVAL);
auto nwritten_or_error = socket_buffer->write(data, data_size);
if (!nwritten_or_error.is_error() && nwritten_or_error.value() > 0)
Thread::current()->did_unix_socket_write(nwritten_or_error.value());
@ -334,17 +334,18 @@ KResultOr<size_t> LocalSocket::recvfrom(FileDescription& description, UserOrKern
{
auto* socket_buffer = receive_buffer_for(description);
if (!socket_buffer)
return EINVAL;
return set_so_error(EINVAL);
if (!description.is_blocking()) {
if (socket_buffer->is_empty()) {
if (!has_attached_peer(description))
return 0;
return EAGAIN;
return set_so_error(EAGAIN);
}
} else if (!can_read(description, 0)) {
auto unblock_flags = Thread::FileDescriptionBlocker::BlockFlags::None;
if (Thread::current()->block<Thread::ReadBlocker>({}, description, unblock_flags).was_interrupted())
return EINTR;
if (Thread::current()->block<Thread::ReadBlocker>({}, description, unblock_flags).was_interrupted()) {
return set_so_error(EINTR);
}
}
if (!has_attached_peer(description) && socket_buffer->is_empty())
return 0;
@ -447,7 +448,7 @@ KResult LocalSocket::chown(FileDescription&, uid_t uid, gid_t gid)
auto current_process = Process::current();
if (!current_process->is_superuser() && (current_process->euid() != uid || !current_process->in_group(gid)))
return EPERM;
return set_so_error(EPERM);
m_prebind_uid = uid;
m_prebind_gid = gid;
@ -479,13 +480,13 @@ KResult LocalSocket::sendfd(const FileDescription& socket_description, FileDescr
MutexLocker locker(lock());
auto role = this->role(socket_description);
if (role != Role::Connected && role != Role::Accepted)
return EINVAL;
return set_so_error(EINVAL);
auto& queue = sendfd_queue_for(socket_description);
// FIXME: Figure out how we should limit this properly.
if (queue.size() > 128)
return EBUSY;
return set_so_error(EBUSY);
if (!queue.try_append(move(passing_description)))
return ENOMEM;
return set_so_error(ENOMEM);
return KSuccess;
}
@ -494,11 +495,11 @@ KResultOr<NonnullRefPtr<FileDescription>> LocalSocket::recvfd(const FileDescript
MutexLocker locker(lock());
auto role = this->role(socket_description);
if (role != Role::Connected && role != Role::Accepted)
return EINVAL;
return set_so_error(EINVAL);
auto& queue = recvfd_queue_for(socket_description);
if (queue.is_empty()) {
// FIXME: Figure out the perfect error code for this.
return EAGAIN;
return set_so_error(EAGAIN);
}
return queue.take_first();
}