Initial Implementation of TFTP protocol and new protocol structs.

net/udp.c

@@ -0,0 +1,59 @@
+#include <grub/net/udp.h>
+#include <grub/net/ip.h>
+#include <grub/net/type_net.h>
+#include <grub/net/netbuff.h>
+#include <grub/net/protocol.h>
+/*Assumes that there is allocated memory to the header before the buffer address. */
+static grub_err_t 
+send_udp_packet (struct grub_net_interface *inf, struct grub_net_protocol *prot, struct grub_net_buff *nb)
+{
+
+  struct udphdr *udph;
+  grub_err_t err; 
+  
+  if((err = grub_netbuff_push (nb,sizeof(*udph)) ) != GRUB_ERR_NONE)
+    return err;
+  
+  udph = (struct udphdr *) nb->data;    
+  udph->src = *((grub_uint16_t *) inf->card->tla->addr); 
+  udph->dst = *((grub_uint16_t *) inf->tla->addr);
+  /*no chksum*/
+  udph->chksum = 0;  
+  udph->len = sizeof (sizeof (*udph)) + nb->end - nb->head;
+  
+  return prot->next->send(inf,prot->next,nb); 
+}
+
+static struct grub_net_protocol grub_udp_protocol =
+{
+  .name = "udp",
+  .send = send_udp_packet
+};
+
+void udp_ini(void)
+{
+  grub_protocol_register (&grub_udp_protocol);
+}
+
+void udp_fini(void)
+{
+  grub_protocol_unregister (&grub_udp_protocol);
+}
+
+/*
+int read_udp_packet (grub_uint16_t port,void *buffer,int *buff_len)
+{
+  
+  struct udphdr udph;
+  udph.dst = 0;
+
+  while ( udph.dst != port)
+  {
+    read_ip_packet (buffer,bufflen);
+    grub_memcpy (&udph,buffer,sizeof (udph));
+  }  
+
+  buffer += sizeof (udph);
+  *buff_len -= sizeof (udph);
+
+}*/