networking in grub-emu

grub-core/Makefile.core.def

@@ -1398,3 +1398,9 @@ module = {
   ieee1275 = net/drivers/ieee1275/ofnet.c;
   enable = ieee1275;
 };
+
+module = {
+  name = emunet;
+  emu = net/drivers/emu/emunet.c;
+  enable = ieee1275;
+};

grub-core/net/drivers/emu/emunet.c

@@ -0,0 +1,69 @@
+#include <grub/net/netbuff.h>
+#include <sys/socket.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h> /* the L2 protocols */
+#include <grub/net.h>
+
+static grub_err_t 
+card_open (struct grub_net_card *dev)
+{
+  dev->data_num = socket (AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+  if (dev->data_num < 0)
+    return grub_error (GRUB_ERR_IO, "couldn't open packet interface");
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+card_close (struct grub_net_card *dev)
+{
+  close (dev->data_num);
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t 
+send_card_buffer (struct grub_net_card *dev, struct grub_net_buff *pack)
+{
+  ssize_t actual;
+
+  actual = write (dev->data_num, pack->data, pack->tail - pack->data);
+  if (actual < 0)
+    return grub_error (GRUB_ERR_IO, "couldn't send packets");
+  
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t 
+get_card_packet (struct grub_net_card *dev, struct grub_net_buff *pack)
+{
+  ssize_t actual;
+
+  grub_netbuff_clear(pack); 
+  actual = read (dev->data_num, pack->data, 1500);
+  if (actual < 0)
+    return grub_error (GRUB_ERR_IO, "couldn't receive packets");
+  grub_netbuff_put (pack, actual);
+
+  return GRUB_ERR_NONE; 
+}
+
+static struct grub_net_card_driver emudriver = 
+{
+  .name = "emu",
+  .init = card_open,
+  .fini = card_close,  
+  .send = send_card_buffer, 
+  .recv = get_card_packet
+};
+
+GRUB_MOD_INIT(emunet)
+{
+  grub_net_card_driver_register (&emudriver);
+}
+
+GRUB_MODE_FINI(emunet)
+{
+  grub_net_card_driver_unregister (&emudriver);
+}
+
+
+

include/grub/net.h

@@ -84,7 +84,11 @@ struct grub_net_card
   struct grub_net_card_driver *driver;
   grub_net_link_level_address_t default_address;
   grub_net_card_flags_t flags;
-  void *data;
+  union
+  {
+    void *data;
+    int data_num;
+  };
 };
 
 struct grub_net_network_level_interface;