// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* NET3: Support for 802.2 demultiplexing off Ethernet
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*
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* Demultiplex 802.2 encoded protocols. We match the entry by the
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* SSAP/DSAP pair and then deliver to the registered datalink that
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* matches. The control byte is ignored and handling of such items
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* is up to the routine passed the frame.
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*
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* Unlike the 802.3 datalink we have a list of 802.2 entries as
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* there are multiple protocols to demux. The list is currently
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* short (3 or 4 entries at most). The current demux assumes this.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <net/datalink.h>
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#include <linux/mm.h>
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#include <linux/in.h>
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#include <linux/init.h>
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#include <net/llc.h>
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#include <net/p8022.h>
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static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
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unsigned char *dest)
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{
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llc_build_and_send_ui_pkt(dl->sap, skb, dest, dl->sap->laddr.lsap);
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return 0;
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}
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struct datalink_proto *register_8022_client(unsigned char type,
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int (*func)(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt,
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struct net_device *orig_dev))
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{
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struct datalink_proto *proto;
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proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
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if (proto) {
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proto->type[0] = type;
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proto->header_length = 3;
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proto->request = p8022_request;
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proto->sap = llc_sap_open(type, func);
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if (!proto->sap) {
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kfree(proto);
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proto = NULL;
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}
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}
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return proto;
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}
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void unregister_8022_client(struct datalink_proto *proto)
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{
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llc_sap_put(proto->sap);
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kfree(proto);
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}
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EXPORT_SYMBOL(register_8022_client);
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EXPORT_SYMBOL(unregister_8022_client);
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MODULE_LICENSE("GPL");
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