/*
 *	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");
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>Diffstat</a></div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_forward.c?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_forward.c</a></td><td class='right'>2</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 1.9%;'/><td class='rem' style='width: 1.9%;'/><td class='none' style='width: 96.3%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_input.c?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_input.c</a></td><td class='right'>8</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 13.0%;'/><td class='rem' style='width: 1.9%;'/><td class='none' style='width: 85.2%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_private.h?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_private.h</a></td><td class='right'>2</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 3.7%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 96.3%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_private_tunnel.h?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_private_tunnel.h</a></td><td class='right'>11</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 20.4%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 79.6%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_vlan.c?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_vlan.c</a></td><td class='right'>7</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 13.0%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 87.0%;'/></tr></table></td></tr>
<tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/bridge/br_vlan_tunnel.c?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>net/bridge/br_vlan_tunnel.c</a></td><td class='right'>54</td><td class='graph'><table summary='file diffstat' width='54%'><tr><td class='add' style='width: 100.0%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>6 files changed, 82 insertions, 2 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c