Kernel/Networking/LibC: Add syscalls and libc functions for UDP

This allows a UDP server to be created in userland and read data.
Currently it can't send data and is very very simplistic.

Code is horrible and probably needs some fixing until it can be further built
upon.

1 files changed, 5 insertions, 3 deletions

diff --git a/network/ethernet.c b/network/ethernet.c
index ae8e814..11a3876 100644
--- a/network/ethernet.c
+++ b/network/ethernet.c
@@ -4,6 +4,7 @@
 #include <network/arp.h>
 #include <network/bytes.h>
 #include <network/ethernet.h>
+#include <network/ipv4.h>
 #include <stdio.h>
 
 struct ETHERNET_HEADER {
@@ -44,10 +45,10 @@ uint32_t crc32(const char *buf, size_t len) {
   return ~crc;
 }
 
-void handle_ethernet(uint8_t *packet, uint64_t packet_length) {
+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);
-  uint8_t *payload = packet;
+  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);
@@ -70,7 +71,7 @@ void handle_ethernet(uint8_t *packet, uint64_t packet_length) {
     handle_arp(payload);
     break;
   case 0x0800:
-    kprintf("IPV4 message\n");
+    handle_ipv4(payload, packet_length - sizeof(struct ETHERNET_HEADER) - 4);
     break;
   default:
     kprintf("Can't handle ethernet type\n");
@@ -97,5 +98,6 @@ void send_ethernet_packet(uint8_t mac_dst[6], uint16_t type, uint8_t *payload,
       htonl(crc32((const char *)buffer_start, buffer_size - 4));
 
   assert(rtl8139_send_data(buffer_start, buffer_size));
+  kfree(buffer_start);
   kprintf("sent data\n");
 }