root/net/802/p8022.c

DEFINITIONS

1. p8022_request
2. register_8022_client
3. unregister_8022_client

/*
 *      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");