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 */
p8023_request(struct datalink_proto * dl,struct sk_buff * skb,unsigned char * dest_node)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 */
make_8023_client(void)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 */
destroy_8023_client(struct datalink_proto * dl)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");
61