From e6c8f7298b40757a410d9df6319824c4f0d70351 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Wed, 28 Feb 2024 21:47:49 +0100
Subject: TCP/UDP: Start rewrite of network sockets

Having sockets be file descriptors seems like a bad idea so I trying to
make UDP and TCP sockets be more independent and not be abstracted away
as much.
---
 kernel/socket.h | 51 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 37 insertions(+), 14 deletions(-)

(limited to 'kernel/socket.h')

diff --git a/kernel/socket.h b/kernel/socket.h
index f765fb7..174ceb1 100644
--- a/kernel/socket.h
+++ b/kernel/socket.h
@@ -3,6 +3,7 @@
 #include <fs/fifo.h>
 #include <fs/vfs.h>
 #include <lib/buffered_write.h>
+#include <lib/stack.h>
 #include <stddef.h>
 #include <typedefs.h>
 
@@ -17,6 +18,42 @@
 
 #define MSG_WAITALL 1
 
+u32 gen_ipv4(u8 i1, u8 i2, u8 i3, u8 i4);
+u32 tcp_connect_ipv4(u32 ip, u16 port, int *error);
+
+u32 tcp_listen_ipv4(u32 ip, u16 port, int *error);
+u32 tcp_accept(u32 listen_socket, int *error);
+
+int tcp_write(u32 socket, const u8 *buffer, u64 len, u64 *out);
+int tcp_read(u32 socket, u8 *buffer, u64 buffer_size, u64 *out);
+
+struct TcpListen {
+  u32 ip;
+  u16 port;
+  struct stack incoming_connections;
+};
+
+struct TcpConnection {
+  int dead;
+  u16 incoming_port;
+  u32 outgoing_ip;
+  u16 outgoing_port;
+
+  int unhandled_packet;
+
+  FIFO_FILE *data_file;
+
+  u32 seq;
+  u32 ack;
+
+  int handshake_state;
+};
+
+struct TcpConnection *internal_tcp_incoming(u32 src_ip, u16 src_port,
+                                            u32 dst_ip, u16 dst_port);
+
+struct TcpConnection *tcp_find_connection(u16 port);
+
 typedef struct {
   vfs_fd_t *ptr_socket_fd;
   FIFO_FILE *fifo_file;
@@ -42,20 +79,6 @@ typedef struct {
   SOCKET *s;
 } OPEN_INET_SOCKET;
 
-struct INCOMING_TCP_CONNECTION {
-  u8 ip[4];
-  u16 n_port;
-  u16 dst_port;
-  FIFO_FILE *data_file;
-  struct buffered buffer;
-  u8 *has_data_ptr;
-  u8 is_used;
-  u32 ack_num;
-  u32 seq_num;
-  u8 connection_closed;
-  u8 requesting_connection_close;
-};
-
 typedef u32 in_addr_t;
 typedef u16 in_port_t;
 typedef unsigned int sa_family_t;
-- 
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