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/*

 *      NET3:   Support for 802.2 demultiplexing off Ethernet (Token ring

 *              is kept separate see p8022tr.c)

 *              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 <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");