67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/*
|
|
* NET3: Support for 802.2 demultiplexing off Ethernet
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Demultiplex 802.2 encoded protocols. We match the entry by the
|
|
* SSAP/DSAP pair and then deliver to the registered datalink that
|
|
* matches. The control byte is ignored and handling of such items
|
|
* is up to the routine passed the frame.
|
|
*
|
|
* Unlike the 802.3 datalink we have a list of 802.2 entries as
|
|
* there are multiple protocols to demux. The list is currently
|
|
* short (3 or 4 entries at most). The current demux assumes this.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <net/datalink.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/in.h>
|
|
#include <linux/init.h>
|
|
#include <net/llc.h>
|
|
#include <net/p8022.h>
|
|
|
|
static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
|
|
unsigned char *dest)
|
|
{
|
|
llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
|
|
return 0;
|
|
}
|
|
|
|
struct datalink_proto *register_8022_client(unsigned char type,
|
|
int (*func)(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
struct packet_type *pt,
|
|
struct net_device *orig_dev))
|
|
{
|
|
struct datalink_proto *proto;
|
|
|
|
proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
|
|
if (proto) {
|
|
proto->type[0] = type;
|
|
proto->header_length = 3;
|
|
proto->request = p8022_request;
|
|
proto->sap = llc_sap_open(type, func);
|
|
if (!proto->sap) {
|
|
kfree(proto);
|
|
proto = NULL;
|
|
}
|
|
}
|
|
return proto;
|
|
}
|
|
|
|
void unregister_8022_client(struct datalink_proto *proto)
|
|
{
|
|
llc_sap_put(proto->sap);
|
|
kfree(proto);
|
|
}
|
|
|
|
EXPORT_SYMBOL(register_8022_client);
|
|
EXPORT_SYMBOL(unregister_8022_client);
|
|
|
|
MODULE_LICENSE("GPL");
|