net/802/p8023.c

   1 /*
   2  *      NET3:   802.3 data link hooks used for IPX 802.3
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License
   6  *      as published by the Free Software Foundation; either version
   7  *      2 of the License, or (at your option) any later version.
   8  *
   9  *      802.3 isn't really a protocol data link layer. Some old IPX stuff
  10  *      uses it however. Note that there is only one 802.3 protocol layer
  11  *      in the system. We don't currently support different protocols
  12  *      running raw 802.3 on different devices. Thankfully nobody else
  13  *      has done anything like the old IPX.
  14  */
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/skbuff.h>
  18 #include <net/datalink.h>
  19 #include <linux/mm.h>
  20 #include <linux/in.h>
  21
  22 /*
  23  *      Place an 802.3 header on a packet. The driver will do the mac
  24  *      addresses, we just need to give it the buffer length.
  25  */
  26
  27 static void p8023_datalink_header(struct datalink_proto *dl,
  28                 struct sk_buff *skb, unsigned char *dest_node)
  29 {
  30         struct net_device       *dev = skb->dev;
  31         dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
  32 }
  33
  34 /*
  35  *      Create an 802.3 client. Note there can be only one 802.3 client
  36  */
  37
  38 struct datalink_proto *make_8023_client(void)
  39 {
  40         struct datalink_proto   *proto;
  41
  42         proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC);
  43         if (proto != NULL)
  44         {
  45                 proto->type_len = 0;
  46                 proto->header_length = 0;
  47                 proto->datalink_header = p8023_datalink_header;
  48                 proto->string_name = "802.3";
  49         }
  50         return proto;
  51 }
  52
  53 /*
  54  *      Destroy the 802.3 client.
  55  */
  56
  57 void destroy_8023_client(struct datalink_proto *dl)
  58 {
  59         if (dl)
  60                 kfree(dl);
  61 }
  62