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Kernel: Make TCPSocket::create API OOM safe

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Note that the changes to IPv4Socket::create are unfortunately needed as
the return type of TCPSocket::create and IPv4Socket::create don't match.

 - KResultOr<NonnullRefPtr<TcpSocket>>>
   vs
 - KResultOr<NonnullRefPtr<Socket>>>

To handle this we are forced to manually decompose the KResultOr<T> and
return the value() and error() separately.
This commit is contained in:
Brian Gianforcaro 2021-05-13 01:01:38 -07:00 • committed by Andreas Kling
parent 9375f3dc09
commit 46ce7adf7b
3 changed files with 17 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Kernel/Net/IPv4Socket.cpp
View file

@ -36,8 +36,12 @@ Lockable<HashTable<IPv4Socket*>>& IPv4Socket::all_sockets()
KResultOr<NonnullRefPtr<Socket>> IPv4Socket::create(int type, int protocol) KResultOr<NonnullRefPtr<Socket>> IPv4Socket::create(int type, int protocol)
{ {
if (type == SOCK_STREAM) if (type == SOCK_STREAM) {
return TCPSocket::create(protocol); auto tcp_socket = TCPSocket::create(protocol);
if (tcp_socket.is_error())
return tcp_socket.error();
return tcp_socket.release_value();
}
if (type == SOCK_DGRAM) if (type == SOCK_DGRAM)
return UDPSocket::create(protocol); return UDPSocket::create(protocol);
if (type == SOCK_RAW) if (type == SOCK_RAW)

12
Kernel/Net/TCPSocket.cpp
View file

@ -98,8 +98,11 @@ RefPtr<TCPSocket> TCPSocket::create_client(const IPv4Address& new_local_address,
if (sockets_by_tuple().resource().contains(tuple)) if (sockets_by_tuple().resource().contains(tuple))
return {}; return {};
auto client = TCPSocket::create(protocol()); auto result = TCPSocket::create(protocol());
if (result.is_error())
return {};
auto client = result.release_value();
client->set_setup_state(SetupState::InProgress); client->set_setup_state(SetupState::InProgress);
client->set_local_address(new_local_address); client->set_local_address(new_local_address);
client->set_local_port(new_local_port); client->set_local_port(new_local_port);
@ -142,9 +145,12 @@ TCPSocket::~TCPSocket()
dbgln_if(TCP_SOCKET_DEBUG, "~TCPSocket in state {}", to_string(state())); dbgln_if(TCP_SOCKET_DEBUG, "~TCPSocket in state {}", to_string(state()));
} }
NonnullRefPtr<TCPSocket> TCPSocket::create(int protocol) KResultOr<NonnullRefPtr<TCPSocket>> TCPSocket::create(int protocol)
{ {
return adopt_ref(*new TCPSocket(protocol)); auto socket = adopt_ref_if_nonnull(new TCPSocket(protocol));
if (socket)
return socket.release_nonnull();
return ENOMEM;
} }
KResultOr<size_t> TCPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags) KResultOr<size_t> TCPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags)

3
Kernel/Net/TCPSocket.h
View file

@ -10,6 +10,7 @@
#include <AK/HashMap.h> #include <AK/HashMap.h>
#include <AK/SinglyLinkedList.h> #include <AK/SinglyLinkedList.h>
#include <AK/WeakPtr.h> #include <AK/WeakPtr.h>
#include <Kernel/KResult.h>
#include <Kernel/Net/IPv4Socket.h> #include <Kernel/Net/IPv4Socket.h>
namespace Kernel { namespace Kernel {
@ -17,7 +18,7 @@ namespace Kernel {
class TCPSocket final : public IPv4Socket { class TCPSocket final : public IPv4Socket {
public: public:
static void for_each(Function<void(const TCPSocket&)>); static void for_each(Function<void(const TCPSocket&)>);
static NonnullRefPtr<TCPSocket> create(int protocol); static KResultOr<NonnullRefPtr<TCPSocket>> create(int protocol);
virtual ~TCPSocket() override; virtual ~TCPSocket() override;
enum class Direction { enum class Direction {