net/802/p8023.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      NET3:   802.3 data link hooks used for IPX 802.3
   4  *
   5  *      802.3 isn't really a protocol data link layer. Some old IPX stuff
   6  *      uses it however. Note that there is only one 802.3 protocol layer
   7  *      in the system. We don't currently support different protocols
   8  *      running raw 802.3 on different devices. Thankfully nobody else
   9  *      has done anything like the old IPX.
  10  */
  11
  12 #include <linux/in.h>
  13 #include <linux/mm.h>
  14 #include <linux/module.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/slab.h>
  18
  19 #include <net/datalink.h>
  20 #include <net/p8022.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 static int p8023_request(struct datalink_proto *dl,
  27                          struct sk_buff *skb, unsigned char *dest_node)
  28 {
  29         struct net_device *dev = skb->dev;
  30
  31         dev_hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
  32         return dev_queue_xmit(skb);
  33 }
  34
  35 /*
  36  *      Create an 802.3 client. Note there can be only one 802.3 client
  37  */
  38 struct datalink_proto *make_8023_client(void)
  39 {
  40         struct datalink_proto *proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
  41
  42         if (proto) {
  43                 proto->header_length = 0;
  44                 proto->request       = p8023_request;
  45         }
  46         return proto;
  47 }
  48
  49 /*
  50  *      Destroy the 802.3 client.
  51  */
  52 void destroy_8023_client(struct datalink_proto *dl)
  53 {
  54         kfree(dl);
  55 }
  56
  57 EXPORT_SYMBOL(destroy_8023_client);
  58 EXPORT_SYMBOL(make_8023_client);
  59
  60 MODULE_LICENSE("GPL");