blob: a6585627051d5b79190ada133fc452b2ca755f77 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
* NET3: Support for 802.2 demultiplexing off Ethernet
* 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) {
proto = NULL;
return proto;
void unregister_8022_client(struct datalink_proto *proto)