From 8a9208612eec8ddae4c418485d848ecfa0613699 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Mon, 30 Oct 2023 22:12:14 +0100
Subject: Meta: Move kernel and userland to their own folders.

This is to allow both the kernel and the userland to share certain
header files and to make the folder structure a bit more clear.
---
 network/ethernet.c | 93 ------------------------------------------------------
 1 file changed, 93 deletions(-)
 delete mode 100644 network/ethernet.c

(limited to 'network/ethernet.c')

diff --git a/network/ethernet.c b/network/ethernet.c
deleted file mode 100644
index e97ccbd..0000000
--- a/network/ethernet.c
+++ /dev/null
@@ -1,93 +0,0 @@
-#include <assert.h>
-#include <drivers/rtl8139.h>
-#include <kmalloc.h>
-#include <network/arp.h>
-#include <network/bytes.h>
-#include <network/ethernet.h>
-#include <network/ipv4.h>
-#include <stdio.h>
-
-struct ETHERNET_HEADER {
-  uint8_t mac_dst[6];
-  uint8_t mac_src[6];
-  uint16_t type;
-};
-
-uint32_t crc32(const char *buf, size_t len) {
-  static uint32_t table[256];
-  static int have_table = 0;
-  uint32_t rem;
-  uint8_t octet;
-  int i, j;
-  const char *p, *q;
-
-  if (have_table == 0) {
-    for (i = 0; i < 256; i++) {
-      rem = i;
-      for (j = 0; j < 8; j++) {
-        if (rem & 1) {
-          rem >>= 1;
-          rem ^= 0xedb88320;
-        } else
-          rem >>= 1;
-      }
-      table[i] = rem;
-    }
-    have_table = 1;
-  }
-
-  uint32_t crc = 0xFFFFFFFF;
-  q = buf + len;
-  for (p = buf; p < q; p++) {
-    octet = *p;
-    crc = (crc >> 8) ^ table[(crc & 0xff) ^ octet];
-  }
-  return ~crc;
-}
-
-void handle_ethernet(const uint8_t *packet, uint64_t packet_length) {
-  struct ETHERNET_HEADER *eth_header = (struct ETHERNET_HEADER *)packet;
-  packet += sizeof(struct ETHERNET_HEADER);
-  const uint8_t *payload = packet;
-  packet += packet_length - sizeof(struct ETHERNET_HEADER);
-  uint32_t crc = *((uint32_t *)packet - 1);
-  kprintf("PACKET crc: %x\n", crc);
-  kprintf("OUR OWN CALCULATED crc: %x\n",
-          crc32((const char *)eth_header, (packet_length - 4)));
-
-  uint16_t type = ntohs(eth_header->type);
-  switch (type) {
-  case 0x0806:
-    handle_arp(payload);
-    break;
-  case 0x0800:
-    handle_ipv4(payload, packet_length - sizeof(struct ETHERNET_HEADER) - 4);
-    break;
-  default:
-    kprintf("Can't handle ethernet type\n");
-    break;
-  }
-}
-
-void send_ethernet_packet(uint8_t mac_dst[6], uint16_t type, uint8_t *payload,
-                          uint64_t payload_length) {
-  // FIXME: Janky allocation, do this better
-  uint64_t buffer_size =
-      sizeof(struct ETHERNET_HEADER) + payload_length + sizeof(uint32_t);
-  uint8_t *buffer = kmalloc(buffer_size);
-  uint8_t *buffer_start = buffer;
-  struct ETHERNET_HEADER *eth_header = (struct ETHERNET_HEADER *)buffer;
-  buffer += sizeof(struct ETHERNET_HEADER);
-  memcpy(buffer, payload, payload_length);
-  buffer += payload_length;
-
-  memcpy(eth_header->mac_dst, mac_dst, sizeof(uint8_t[6]));
-  get_mac_address(eth_header->mac_src);
-  eth_header->type = htons(type);
-  *(uint32_t *)(buffer) =
-      htonl(crc32((const char *)buffer_start, buffer_size - 4));
-
-  assert(rtl8139_send_data(buffer_start, buffer_size));
-  kfree(buffer_start);
-  kprintf("sent data\n");
-}
-- 
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