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/in.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/skbuff.h>
  21
  22 #include <net/datalink.h>
  23
  24 /*
  25  *      Place an 802.3 header on a packet. The driver will do the mac
  26  *      addresses, we just need to give it the buffer length.
  27  */
  28 static int p8023_request(struct datalink_proto *dl,
  29                          struct sk_buff *skb, unsigned char *dest_node)
  30 {
  31         struct net_device *dev = skb->dev;
  32
  33         dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
  34         return dev_queue_xmit(skb);
  35 }
  36
  37 /*
  38  *      Create an 802.3 client. Note there can be only one 802.3 client
  39  */
  40 struct datalink_proto *make_8023_client(void)
  41 {
  42         struct datalink_proto *proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
  43
  44         if (proto) {
  45                 proto->header_length = 0;
  46                 proto->request       = p8023_request;
  47         }
  48         return proto;
  49 }
  50
  51 /*
  52  *      Destroy the 802.3 client.
  53  */
  54 void destroy_8023_client(struct datalink_proto *dl)
  55 {
  56         if (dl)
  57                 kfree(dl);
  58 }
  59
  60 EXPORT_SYMBOL(destroy_8023_client);
  61 EXPORT_SYMBOL(make_8023_client);